Title of Invention	A FLEXIBLE CEILING PANEL AND A CEILING SYSTEM INCORPORATING THE SAME
Abstract	A flexible ceiling panel (108) that can be folded or flexed comprises: - at least one planar sheet (110); and - at least one sheet of a substantially flat material formed into a first reinforcement member (114) that is a three-dimensional self-supporting body having a plurality of elongated cells formed between the planar sheet and the reinforcement member; and wherein the planar sheet and the reinforcement member are each of a slightly rigid but flexible material that comprises heat-resistant fibers bound together by a resin.

Title of Invention

A FLEXIBLE CEILING PANEL AND A CEILING SYSTEM INCORPORATING THE SAME

Abstract

A flexible ceiling panel (108) that can be folded or flexed comprises: - at least one planar sheet (110); and - at least one sheet of a substantially flat material formed into a first reinforcement member (114) that is a three-dimensional self-supporting body having a plurality of elongated cells formed between the planar sheet and the reinforcement member; and wherein the planar sheet and the reinforcement member are each of a slightly rigid but flexible material that comprises heat-resistant fibers bound together by a resin.

Full Text	A FLEXIBLE CEILING PANEL AND A CEILING SYSTEM INCORPORATING THE SAME BACKGROUND OF THE INVENTION Field of the Invention The present invention relates to a flexible ceiling panel and a ceiling system incorporating the same. This invention further relates to coverings for the ceilings and walls of building structures and, more particularly, to a drop ceiling or a wall panel wherein individual panels are supported on a matrix of support members. Description of the Relevant Art The ceilings of building structures have taken numerous forms. Ceilings may be left unfinished so that rafters or beams of the building structure itself are exposed or the rafters and beams may be covered as with drywall, wood strips, plaster or other similar finishes. Walls of building structures may be similarly finished. Another popular ceiling system is commonly referred to as a drop ceiling where a plurality of support bars are suspended from the unfinished ceiling so as to form a matrix having a plurality of side-by-side openings defined between the support bars. The openings are filled with panels which are typically rigid acoustical panels, with the panels being supported along their peripheral edge by the support bars. While such drop ceilings have met with some success, there are numerous disadvantages. One disadvantage is that there is very little variety in the aesthetics of the ceiling system since most acoustical panels have the same general appearance, with another disadvantage residing in the fact that the panels are rigid and brittle so that they are easily breakable and, further, due to their rigidity, they are difficult to insert into the opening provided therefor in as much as the support bars must partially protrude into the opening in order to provide a support surface for the panels. It is to overcome the shortcomings in prior art drop ceiling systems and to provide a new and improved cladding system for walls or ceilings that the present invention has been made. SUMMARY OF THE INVENTION The present invention pertains to a new and improved drop ceiling system wherein a plurality of flexible panels are preferably removably supported on a grid work of support bars. The support bars may be of inverted T-shaped cross-sectional configuration and form a matrix from longitudinally extending stringers and laterally extending cross-members. The flexible panels are sized to fit within the openings defined by the stringers and cross-members and rest upon ledges of the inverted T-shaped support members. The panels can take numerous configurations but include at least one sheet of somewhat rigid but flexible or foldable material preferably made of a fibrous material that is reinforced in one of numerous ways so that it can be folded or flexed while being inserted into an opening in the supporting grid work and subsequently unfolded above the grid work so that it can be easily positioned on the supporting grid work. In various disclosed embodiments, the panel can be made to be collapsible or compressible. The sheet material can be reinforced by a second parallel sheet of material with support members bridging the space therebetween or it may be reinforced simply by a plurality of reinforcing members extended along an unexposed, or possibly even exposed, surface of the sheet material. Where multiple sheets of material are utilized, support members are provided for retaining the sheet materials in a desired spaced relationship. The panels so formed provide adequate insulation and also, in most instances, provide an exposed planar surface that can be covered with a decorative film of various colors, grains or textural patterns to provide variety to the aesthetics of the ceiling system once it has been installed. While the panels have been summarized and will be described hereafter in more detail as forming part of a ceiling system, it will be apparent tp those skilled in the art that with modification of the support system the panels could also be used in the walls of a building structure. Other aspects, features and details of the present invention can be more completely understood by reference to the following detailed description of a preferred embodiment, taken in conjunction with the accompanying drawings and from the invention as hereinafter claimed. BRIEF DESCRIPTION OF THE ACCOMPANYING DRAWINGS Fig. 1 is an isometric view of a panel formed in accordance with a first embodiment of the present invention. Fig. 2 is a fragmentary isometric view looking upwardly at a drop ceiling system in accordance with the present invention utilizing the panels of Fig. 1. Fig. 3 is an enlarged fragmentary section taken along line 3-3 of Fig. 2. Fig. 4 is an enlarged side elevation of the panel of Fig. 1. Fig. 5 is an enlargement of a section of Fig. 4 showing support members for the panel in dashed lines. Fig. 6 is an enlarged fragmentary isometric view of the panel of Fig. 1. Fig. 7 is a view similar to Fig. 6 with a support member of the type shown in dashed lines in Fig. 5 shown in solid lines. Fig. 8 is a view similar to Fig. 5 with the panel being folded and with the support members shown in dashed lines where they would be incorporated if the panel were fully expanded as shown in Fig. 5. Fig. 9 is a side elevation of the panel of Fig. 8 after having been fully folded into a flat condition. Fig. 10 is a side elevation showing three panels in a fully folded condition and stacked upon each other. Fig. 11 is a view similar to Fig. 5 showing the panel partially folded or bent which facilitates insertion of the panel into a position within the supporting grid work for the ceiling system. Fig. 12 is a reduced side elevation similar to Fig. 11 again showing the panel slightly folded or bent. Fig. 13 is an exploded isometric view of the panel of Fig. 1 but including a decorative film layer for covering the lower face of the panel of Fig. 1. Fig. 14 is an enlarged view of the circled area of Fig. 13. Fig. 15 is a side elevation of a panel as shown in Fig. 1 with end caps running along opposite ends of the panel to retain the panel in an expanded condition. Fig. 16 is an enlarged fragmentary section taken along line 16-16 of Fig. 15. Fig. 17 is a fragmentary isometric view with parts broken away of the panel shown in Figs. 15 and 16. Fig. 18 is a side elevation of a second embodiment of a panel in accordance with the present invention with the panel shown folded in dotted lines. Fig. 19 is an enlarged fragmentary side elevation of a portion of the panel shown in Fig. 18. Fig. 20 is a fragmentary isometric of the panel as shown in Fig. 19. Fig, 21 is a side elevation of a third embodiment of a panel in accordance with the present invention with the panel being similar to the panel shown in Fig- 18 but with a second parallel sheet of material. Fig. 22 is an enlarged fragmentary side elevation of a portion of the panel of Fig. 21. Fig. 23 is an enlarged fragmentary isometric view of the panel shown in Fig. 21. Fig. 24 is a fragmentary isometric view of the reinforcement portion of the panel of Fig. 21 showing a first method of applying glue to the reinforcement. Fig. 25 is a view similar to Fig. 24 with a second method of applying glue to the reinforcement material. Fig. 26 is a view similar to Fig. 24 illustrating a third method of applying glue to the reinforcement. Fig. 27 is a side elevation similar to Fig. 21 with the panel of Fig. 21 having been partially compressed. Fig. 28 is an enlarged fragmentary section of the panel as seen in Fig. 27. Fig. 29 is a fragmentary section similar to Fig. 28 with the panel having been further compressed. Fig. 30 is an isometric view of the panel as shown in Fig. 27 partially compressed. Fig. 31 is a side elevation of a fourth embodiment of a panel formed in accordance with the present invention. Fig. 32 is an enlarged fragmentary section of a portion of the panel as shown in Fig. 31. Fig. 33 is a fragmentary section similar to Fig. 32 with the panel partially compressed. Fig. 34 is a fragmentary isometric of the panel shown in Fig. 31. Fig. 35 is a side elevation of a fifth embodiment of a panel formed in accordance with the present invention. Fig. 35A is an enlargement of the circled area of Fig. 36. Fig. 36 is an enlarged fragmentary section illustrating a portion of the panel shown in Fig. 35. Fig. 37 is a fragmentary section similar to Fig. 36 with the panel having been partially compressed. Fig. 38 is a fragmentary isometric of the panel shown in Fig. 35. Fig. 39 is a side elevation of a sixth embodiment of a panel formed in accordance with the present invention. Fig. 40 is an enlarged fragmentary section of a portion of the panel shown in Fig. 39. Fig. 41 is a fragmentary isometric of the portion of the panel shown in Fig. 40. Fig. 42 is a side elevation of a panel similar to that shown in Fig. 39 with a parallel sheet of material added to the panel. Fig. 43 is a fragmentary vertical section of a portion of the panel shown in Fig. 42. Fig. 44 is a fragmentary isometric of the portion of the panel shown in Fig. 43. Fig. 45 is a side elevation of the panel shown in Fig. 39 with a fold or curve formed in the panel. Fig. 45 A is an enlarged view similar to Fig. 45 showing the reinforcement portion of the panel of Fig. 45 in solid lines and parallel sheets connected to the reinforcement portion in dashed lines. Fig. 46 is a fragmentary vertical section through a seventh embodiment of a panel formed in accordance with the present invention. Fig. 47 is an isometric view of an eighth embodiment of a panel formed in accordance with the present invention. Fig. 48 is an exploded isometric view of the panel shown in Fig. 47. Fig. 49 is an isometric view of a secondary reinforcement strip used in the panel of Fig. 47. Fig. 50 is an isometric view of the reinforcement structure for the panel shown in Fig. 47. Fig. 51 is an isometric view of a sheet of material illustrating how the secondary reinforcement shown in Fig. 49 can be cut from such a sheet. Fig. 52 is a side elevation of the panel shown in Fig. 47 looking upwardly and to the right from the lower lefthand side of the panel as shown in Fig. 47. Fig. 53 is an enlarged section taken along line 53-53 of Fig. 52. Fig. 54 is a section taken along line 54-54 of Fig. 53. Fig. 55 is a section taken along line 55-55 of Fig. 56 and similar to Fig. 53 showing the panel partially compressed. Fig. 56 is a section taken along line 56-56 of Fig. 55 and being similar to Fig. 54 with the panel partially compressed. Fig. 57 is a side elevation of aninth embodiment of apanel formed in accordance with the present invention. Fig. 58 is a fragmentary vertical section taken through a portion of the panel shown in Fig. 57. Fig. 59 is a fragmentary isometric of the portion of the panel illustrated in Fig. 58. Fig. 60 is a side elevation of a tenth embodiment of a panel formed in accordance with the present invention. Fig. 61 is a fragmentary vertical section taken through the panel of Fig. 60. Fig. 62 is a fragmentary isometric showing the portion of the panel illustrated in Fig. 61. Fig. 63 is a side elevation of an eleventh embodiment of a panel formed in accordance with the present invention. Fig. 64 is an enlarged fragmentary vertical section showing a portion of the panel of Fig. 63. Fig. 65 is a fragmentary isometric showing the portion of the panel illustrated in Fig. 64. Fig. 66 is a side elevation of a twelfth embodiment of a panel formed in accordance with the present invention. Fig. 67 is an enlarged vertical section taken through a portion of the panel shown in Fig. 66. Fig. 68 is a fragmentary isometric view illustrating the portion of the panel shown in Fig. 67. Fig. 69 is a side elevation of a thirteenth embodiment of a panel formed in accordance with the present invention. Fig. 70 is an enlarged vertical section taken through a portion of the panel shown in Fig. 69. Fig. 71 is a fragmentary isometric illustrating the portion of the panel shown in Fig. 70. Fig. 72 is a side elevation of a fourteenth embodiment of a panel formed in accordance with the present invention. Fig. 73 is an enlarged vertical section taken through a portion of the panel shown in Fig. 72. Fig. 74 is a vertical section similar to Fig. 73 showing the panel partially compressed. Fig. 75 is a fragmentary isometric of the portion of the panel shown in Figs. 73 and 74. Fig. 76 is a side elevation of a fifteenth embodiment of a panel formed in accordance with the present invention. Fig. 77 is an enlarged vertical section taken through a portion of the panel shown in Fig. 76. Fig. 78 is a vertical section similar to Fig. 77 showing the panel partially compressed. Fig. 79 is a fragmentary isometric of the portion of the panel shown in Figs. 77 and 78. Fig. 80 is a fragmentary isometric view of a support member adapted for use in connection with the panel shown in Fig. 60. Fig. 81 is an end elevation of the support member shown in Fig. 80. Fig. 82 is an end elevation of the support member incorporated into the panel of Fig. 60. Fig. 83 is a side elevation of the pane] of Fig.60 with the support member of Fig. 80 incorporated therein. DESCRIPTION OF THE PREFERRED EMBODIMENTS A drop ceiling system 100 in accordance with the present invention utilizes a conventional suspension system of elongated crisscrossing support members 102 forming a matrix defining openings that are usually rectangular in shape in which a panel in accordance with the present invention can be disposed. The support members typically consist of horizontally disposed elongated stringers 102a that are suspended in a conventional manner and in parallel relationship in one direction across a ceiling structure usually at a vertical spacing of four to six inches from the substructure of the building structure in which the ceiling system is mounted. A plurality of horizontal cross-support members 102b extend in parallel relationship and perpendicularly to the stringers so that the quadrangular openings are defined therebetween. The cross- members are also suspended at the same elevation as the stringers. The stringers and cross-members are of inverted T-shaped cross-section as illustrated in Fig. 3 so as to define horizontal shoulders 104 on either side of a vertical body 106, with the shoulders being adapted to support a peripheral edge of a panel formed in accordance with the present invention. As will be appreciated, the T-shaped support members 102 extend peripherally around each quadrangular opening so that a shoulder is provided to support an entire peripheral edge of a panel. Other types of suspension systems could be utilized, but a suspension system of the type described has proven to be very functional. A first embodiment 108 of a panel in accordance with the present invention is illustrated in Figs. 1-17. As probably best seen in Fig. 5, each panel 108 includes an upper planar sheet 110, a lower planar sheet 112 and a plurality of parallel reinforcement members 114 of substantially S-shaped cross-section. The upper and lower planar sheets as well as the reinforcement members are made of a somewhat rigid material that can be flexed. A material that has worked for this purpose is a non-woven fabric of heat resistant fibers bound together by a heat moldable polymeric resin matrix or a thermal setting resin matrix. For example, fiberglass fibers embedded in an acrylic resin will work for this purpose with the fibers preferably being relatively long and thin. The length of the glass fibers would be at least 1/4 inch, but preferably !4 inch and especially at least one inch. The thickness of the glass fibers would be no less than 7 microns and no more than 100 microns but preferably no more than 32 microns and especially 10-16 microns. A material found suitable for this purpose is 100GSM glass mat #8802 manufactured by Johns Manville of Waterville, Ohio, or an alternative would be materials available from OJI Glasspen in Japan and Ahlstrom in Finland. The upper and lower sheets of material are cut to a predetermined size which corresponds with the area defined by the stringers 102a and cross-members 102b of the support system. As will be appreciated, the upper and lower sheets of material are retained in a parallel and separated relationship by the reinforcement members 114 which are formed from elongated strips of material 116 that are pre-creased at predetermined locations so that they can be folded at right angles at those locations. The strips of material are also cut to pre-determined lengths to form the reinforcement members. The creases are provided at the locations where the strip material 116 is to be folded and these locations are spaced from each edge of the strip approximately one- quarter of the full width of the strip. In this manner, when the strips are folded as illustrated in Figs. 5 and 11, they define an upper flap 124 and a lower flap 126 and an intermediate body 128 which is approximately twice the width of each of the flaps. The crease lines, of course, allow the flaps to be folded relative to the intermediate body. By taking care when creasing the strips that the glass fibers not be damaged, alternative means for maintaining resiliency in the strip material need not be employed as the glass fibers provide the desired resiliency in the material. Each flap is provided with an adhesive on its outer surface to engage the adjacent sheet material 110 or 112 so as to be securely bonded thereto. The adhesive could take numerous forms but a porous adhesive made by EMS-Chemie AG of Domat/Ems, Switzerland and designated flame resistant co-polyester adhesive #1533 has been found acceptable. As will be appreciated, due to the creases in the reinforcement members, and the capability of the strip material 116 to bend along these creases, the reinforcement members by themselves may not necessarily retain the sheet material 110, 112 in spaced relationship rendering the panel collapsible by moving the sheets of material toward each other while they slightly shift laterally relating to each other. To prevent collapsing, diagonal support members 130 of a more rigid plastic material or conceivably the same glass fiber reinforced resin material maybe diagonally inserted into each cell 132 defined between the sheet material and adjacent reinforcement members. These support members 130 are illustrated in dashed lines in Fig. 5 and in full lines in Fig. 7. The support members can be inserted in every cell or in spaced cells as is necessary to support the panel as desired. Even with the support members inserted in each cell, however, the panel can be slightly flexed or bent as illustrated in Figs. 11 or 12. As will be appreciated, due to the flexibility of the panels, they can be easily inserted into the openings between the stringers 102a and cross-members 102b even though the overall fully extended size of the panel 108 is substantially equal to the size of that opening. This, of course, provides a distinct advantage over systems in the prior art where rigid panels that could not be bent or flexed have to be inserted into an opening of about the same size. By inserting support members at specified selected locations, but not in all the cells, the panel will take a curved shape that may be useful or appealing in some situations. The reinforcement members 114 can be adhesively bonded to the sheet material 110,112 in any suitable manner but, by way of example, the adhesive could be provided to cover the entire face of a flap 124 or 126, could be provided in continuous lines along the flap but not of the full width of the flap, could be provided in intermittent lines along the flap or other such applications. It is conceivable that the reinforcement member could also be heat welded or ultrasonically bonded to the sheet material as well. It will be appreciated by reference to Figs. 8-10 that by removing the support strips 130 from each cell, the panel 108 can be collapsed by folding the reinforcement members 114 along their creases 122 so that the reinforcement members are flattened and extend in parallel relationship with the upper and lower sheets 110 and 112, respectively, as illustrated in Fig. 9. In this configuration, panels can be stacked as illustrated in Fig. 10 into a small area for shipping purposes thereby saving considerable expense when shipping panels for use in a drop ceiling system. With reference to Fig. 13, it will be appreciated that the panel 108 as described above can be modified by incorporating a decorative continuous layer of elastomeric polymer, preferably a thermoplastic or thermosetting polymeric film 134 or the like, such as a urethane or neoprene film, to the lower exposed face of the lower sheet 112, which face is the face that is exposed to the interior of the room in which the ceiling system is mounted. The film material can be simply a flat sheet of colored material, could be furrowed or otherwise embossed with a pattern, or could have a wood grain or other decorative pattern imprinted thereon. There are numerous possibilities for decorating the lower surface of the panel and this film or related sheet of material can be adhesively or otherwise secured to the panel along the bottom face of the lower sheet of material 112 of the panel. A decorative film as described above or other material may also be applied to the other panel embodiments of this invention, which are described below. Examples of decorative coverings or films would be: a) supported vinyl wall coverings made by Gen Corp. of Columbus, Miss. b) unsupported vinyl films as used in wrapping operations from Alkor Draka of Munich, Germany. c) flame resistant papers made by Pallas Inc. of Green Bay, Wisconsin. d) flame resistant papers made by Permalin Products Co. of New York, New York. e) woven fiberglass mat from Johns Manville of Waterville, Ohio. f) a flame resistant non-woven #TR2315B-1 from H & V of Floyd, VA which has been quilted by Hunter Douglas Inc. of Broomfield, Colorado. g) a flame resistant glass paint on a glass non-woven fabric with the paint bring manufactured by Keim of Holland. The glass non-woven fabric would come from Alkstrom of Finland. As an alternative to the diagonal support members shown in dashed lines in Fig. 5, elongated end caps 136 as shown in Figs. 15-17 could be utilized. These end caps could simply be elongated U-shaped channel members of a rigid material which are adapted to fit snugly over the end of the aforedescribed panel 108 in perpendicular relationship to the longitudinal direction of the reinforcement members 114. As will be appreciated, the end caps prevent the panel from collapsing, as illustrated in Figs. 8 and 9, and, of course, could be removed from the panel for shipping purposes and installed on the panel once the panels were ready for installation in a ceiling system. As an alternative the end caps could also be slit to fit within the open end of the panel instead of around the end. By way of example, the end caps could be made of a flame resistant polycarbonate or aluminum and adhesively secured to the panels 108. Figs. 18-20 illustrate a second embodiment 138 of a panel in accordance with the present invention wherein a lower sheet material 140 is reinforced principally in one direction by a furrowed reinforcing sheet 142 that is folded as illustrated in Fig. 19 to define upwardly and downwardly opening trapezoidal channels 144. The trapezoidal channels would be bonded where the reinforcement member is in contiguous abutting face-to-face relationship with the lower sheet material 140. As mentioned previously, the bonding could be done in any variety of ways so long as a positive bond was provided between the reinforcing member and the lower sheet material. As will be appreciated, with an arrangement of this type, the panel can be flexed upwardly in a smooth curve, as illustrated in Fig. 18, and to a smaller degree downwardly but only in one direction of the panel. The trapezoidal channels 144 substantially prevent flexing in a transverse direction to that illustrated. This ability to flex the panel, however, allows the panel to be easily inserted into the opening between the stringers 102a and cross-members 102b in the support structure for the ceiling system. The stiffness of the panel can also be adjusted by the stiffness or rigidity of the lower sheet material 140. In a third embodiment 146 of the present invention, seen in Figs. 21-30, the ceiling panel 146 is formed similarly to the panel illustrated in Figs. 18-20 but wherein an upper sheet material 148 is secured to the trapezoidal reinforcement member 142 along the top surface of the trapezoidal member. The upper sheet material can be adhesively bonded or otherwise secured to the reinforcement member in the same or similar manner as the reinforcement member was secured to the lower sheet material 140. As illustrated in Fig. 24, the bonding of the reinforcement member 142 to the sheet material can be with a full layer of adhesive 150 or, as illustrated in Fig. 25, with a single line of adhesive 150 or, as illustrated in Fig. 26, with parallel lines of adhesive 150 or, as mentioned previously, many other methods of applying adhesive such as intermittently or in dots or the like could also be employed. Again, heat welding or ultrasonic bonding may also be appropriate. The completed panel 146 is probably best seen in Fig. 23 and, again, will bend or flex in one direction of the panel but is substantially prevented from flexing in a lateral or perpendicular direction due to the trapezoidally shaped channels of the reinforcement member 142. The reinforcement member can be formed from a sheet of material that has been creased in opposite faces at spaced parallel locations and subsequently folded. The panel 146 can be compressed for shipping purposes, as illustrated in Figs. 27- 30, with a slight amount of compression probably not appreciably changing the configuration of the panel other than to make it slightly thinner, but further compression causing the straight faces 160 of the reinforcement member to buckle or fold into the contoured configuration shown in Fig. 29. Accordingly, the panels can be forcibly compressed for shipping purposes so as not to occupy as much space within a shipping container and by utilizing an appropriate material for the panels, such as a glass reinforced resin as described previously, the panels will reassume their normal configuration of Figs. 21 and 22. For purposes of the present disclosure, the term "compression" refers to reducing the thickness of a panel without allowing the upper and lower sheets to shift laterally relative to each other while the term "collapsing" refers to reducing the thickness of a panel while permitting lateral shifting of the upper and lower sheets relative to each other. If there were no upper sheet, such as in the embodiment shown in Figs. 18-20, "compression" would occur if the furrowed reinforcing sheet were not allowed to fold laterally as if it were "collapsing" but rather was buckled straight downwardly. Fig. 31 illustrates a fourth embodiment 162 of the present invention where, again, upper and lower planar sheets of material 164 and 166, respectively, are separated by a furrowed reinforcement member 168 that defines upwardly and downwardly opening channels 170 of trapezoidal cross-section but in this embodiment of the invention, the engagement area of the reinforcement member 168 with each planar sheet member 164, 166 is less than the corresponding engagement areas of the panel shown in Figs. 21 and 22. This allows for a more compressible panel and as will be appreciated, by varying the area of engagement between the reinforcement member and the planar sheet members, the compressibility of the panel can be regulated. Fig. 33 shows the panel 162 in a somewhat compressed configuration but when utilizing appropriate resilient materials, the panel will return to the normal configuration illustrated in Fig. 32 upon the release of pressure due to the resiliency of the material utilized. Figs. 35-38 illustrate a fifth embodiment 172 of the present invention which is somewhat similar to those shown in Figs. 21-22 and 31-32 so as to include upper and lower sheets of planar material 174 and 176, respectively, and a reinforcing member 178 therebetween but wherein the reinforcing member is defined by upwardly and downwardly opening channels 180 that are of substantially triangular configuration. In this arrangement, the engagement of the reinforcing member 178 with each planar sheet material 174,176 is a relatively small area which allows even more compressibility of the panel. Fig. 35A is an enlargement of the circled area in Fig. 36 and shows a line of adhesive 182 along a substantially pointed line of engagement of the reinforcement member 178 with the upper planar sheet member 174. A sixth embodiment 184 of the panel of the present invention is illustrated in Figs. 39-41 and can be seen to include a lower planar sheet material 186, a primary reinforcement member 188 substantially of the type shown in Fig. 18, and a secondary reinforcement member 190 overlaid on the primary reinforcement member 188. The primary reinforcement member 188 defines upwardly and downwardly opening channels 192 of trapezoidal cross-sectional configuration and is bonded to the lower planar sheet material 186 along areas of engagement 194. The secondary reinforcement member 190 is overlaid across the top of the primary reinforcement member and also defines upwardly and downwardly opening channels 196 of trapezoidal configuration but wherein the upwardly opening channels are wider than the downwardly opening channels. The downwardly opening channels are sized to conform with and receive the uppermost structure of a downwardly opening channel of the primary reinforcement member 188. The upwardly opening channels of the secondary reinforcement member 190 are adapted to be received in an upwardly opening channel of the primary reinforcement member. The secondary reinforcement member is secured to the primary reinforcement member in any suitable manner such as with adhesive and either continuously or at intermittent locations only along horizontal areas of engagement 198. The panel so formed, again, will flex in one direction but not as readily flex in the lateral transverse direction and Fig. 45 illustrates the panel when so flexed. It will be appreciated that the secondary reinforcement member flexes outwardly across the upwardly opening channels 192 of the primary reinforcement member to allow for the bend in the panel. This, of course, is permitted due to the fact that the secondary reinforcement member is not bonded to the primary reinforcement member in the upwardly opening channels of the primary reinforcement member but only along the top or horizontal areas of engagement 198 with the primary reinforcement member. Figs. 42-44 illustrate an alterative arrangement 200 to the panel illustrated in Figs. 39 and 40, with this alternative arrangement being identical to the arrangement shown in Figs. 39 and 40 but wherein an is bonded to the secondary reinforcement member 190 in parallel relationship with the lower planar sheet member 186. A panel so formed could also be bent as illustrated in Fig. 45 A where the planar sheet members 186 and 202 are illustrated in dashed lines. Fig. 46 illustrates a seventh embodiment 204 of a panel in accordance with the present invention wherein the panel 204 includes upper and lower planar sheets of material 206 and 208, respectively, a primary reinforcement member 210 and a pair of upper and lower secondary reinforcement members 212 and 214, respectively. The primary reinforcement member has upwardly and downwardly opening channels 216 of trapezoidal configuration but the primary reinforcement member is not directly attached to the planar sheet materials. Rather, the secondary reinforcement members 212 and 214, respectively, are secured to the primary reinforcement member 210 along horizontal interfaces 218 between the respective members and, in turn, the secondary reinforcement members are secured to the planar sheet members along horizontal engagement areas 220. The secondary reinforcement members are identical to each other but inverted relative to each other so as to be secured to the primary reinforcement member across the top and bottom thereof substantially as described previously in connection with the embodiment of the invention shown in Figs. 39 and 40. Figs. 47-56 illustrate an eighth embodiment 222 of the present invention wherein a pair of parallel planar sheets 224 and 226 are interconnected by a reinforcement member 228 that includes a primary reinforcement portion 230 and secondary reinforcement portions 232 which provide rigidity in a transverse direction to the primary portion. As best illustrated in Figs. 49 and 50, the primary reinforcement portion 230 is a furrowed member substantially the same as the primary reinforcement member of Fig. 39 thereby defining upwardly and downwardly opening channels 234 of trapezoidal cross-section. The secondary reinforcement portions 232 are insert strips, as illustrated in Fig. 49, that are adapted to be received in the upwardly opening channels of the primary reinforcement portion. Each secondary reinforcement strip has a cross-sectional configuration substantially identical to that of the primary portion, but the planar side walls 236 of the strip, which extend perpendicularly to the channels in the primary reinforcement portion, are tapered so as to converge downwardly thereby to conform with the downwardly convergent walls 238 of the upwardly opening channels of the primary portion of the reinforcement member. Accordingly, when the secondary reinforcement strips are positioned within the upwardly opening channels of the primary reinforcement portion, the reinforcement member is structured as illustrated in Fig. 50, and it will be appreciated that the panel has substantial rigidity in both longitudinal and transverse directions even though a slight degree of flexing is achievable due to the characteristics of the material from which the reinforcement member is made. Fig. 51 illustrates a sheet of material 240 from which the secondary reinforcement portions can be cut and folded and as will be appreciated, a number of such strips 232 can be cut in a complimentary manner from the same sheet of material. Figs. 55 and 56 illustrate the compressible nature of the panel 222 which is permitted due to the flexible nature of the material from which the reinforcement member 228 is made and as will be appreciated, depending upon the amount of pressure applied to the planar sheet members 224 and 226, the reinforcement members will buckle into the contoured configuration illustrated allowing the panel to assume a thinner or shallower cross-section, again, for shipping purposes. In other words, the panels can be forcibly compressed into containers for shipment so as to occupy a minimal amount of space compared to that which would be occupied by the fully expanded panel. Figs. 57-59 illustrate a ninth embodiment 242 of the panel of the present invention which includes a lower planar sheet of material 244 and a reinforcement member 246 bonded or otherwise secured to the upper surface thereof to permit easy flexing of the panel in a downward direction but the reinforcement member resists flexing of the panel in an upwardly direction and transverse directions. The reinforcement member has alternate upwardly and downwardly opening channels 248 of trapezoidal cross-sectional configuration but the opening of each channel is significantly narrower than the opposed closed side of the same channel. As will be appreciated, the panel would be allowed to flex readily in a downward direction but not so readily in an upward direction and not so readily in a transverse direction. The reinforcement member is secured to the planar sheet material along areas of engagement in any suitable manner which could include adhesive applied in lines, continuously across the areas of engagement, along intermittent lines or dots or the like. A tenth embodiment 250 of a panel formed in accordance with the present invention is illustrated in Figs. 60-62. In this embodiment, a planar sheet of material 252 is bonded or otherwise secured in a suitable manner to an overlying reinforcement member 254 that is similar to the reinforcement member shown in the embodiment illustrated in Fig. 58 but wherein the upwardly opening trapezoidal channels 256 of the reinforcement member are significantly wider than the downwardly opening channels 258. This arrangement would permit not only flexing in the downward direction but also more flexing in the upward direction than would be permitted by the embodiment shown in Figs. 57-59. The lower exposed face of the sheet 252, which face is exposed to the interior of the room in which the ceiling system is mounted, can be modified by providing it with a continuous elastomeric polymer (not shown). Preferably, the elastomeric polymer is a thermoplastic or thermosetting polymeric film, such as a urethane or neoprene film, as described previously with reference to Fig. 14, or a urethane or neoprene adhesive that bonds a decorative film, as described above with reference to Fig. 14, on the lower face of the sheet 252. The elastomeric polymer allows the panel 250 to be substantially flexed or bent without visible creasing of the sheet 252. As a result, the panel 250 can be manufactured in long lengths which can be stored and shipped in rolled- up form and then unrolled and cut to length for installation. An eleventh embodiment 260 of a panel in accordance with the present invention is illustrated in Figs. 63-65. This embodiment is identical to that illustrated in Figs. 57- 59 except that an upper pianar sheet of material 262 is secured to a reinforcement member 264 across the top of the reinforcement member in the same or similar manner to which a bottom sheet material 266 is secured to the lower surface of the reinforcement member. This panel would have similar behavioral characteristics to that of the panel illustrated in Fig. 58 but would have slightly more rigidity and better insulating qualities. Figs. 66-68 illustrate a twelfth embodiment 268 of a panel formed in accordance with the present invention, with this embodiment including upper and lower planar sheets of material 270 and 272, respectively, that are secured to and separated by a reinforcement member 274 having upwardly and downwardly opening channels 276 of transverse trapezoidal configuration. The reinforcement member is similar to that of Fig. 58 except that the trapezoidal cross-section is slightly enlarged so that the opening of the trapezoidal channels in both the upward and downward directions is slightly greater than that of the reinforcement member of Fig. 58. A thirteenth embodiment 278 of a panel formed in accordance with the present invention is illustrated in Figs. 69-71, with this panel, including upper and lower planar sheet materials 280 and 282, respectively, that are interconnected by and spaced by a reinforcement member 284. The reinforcement member is substantially identical to that illustrated in the embodiment of Figs. 60 and 61. Figs. 72-75 illustrate the compressibility of the panel 268 described previously in connection with Figs. 66-68 and wherein it will be appreciated in Fig. 73 that the panel can be compressed a slight amount without buckling the resilient walls of the reinforcement member 274, but additional compression allows the walls of the reinforcement member to further fold relative to each other into the configuration illustrated in Fig. 74. The walls will actually buckle so that the panel can be substantially compressed for cost savings during shipment. Figs. 76-79 illustrate the compressibility of the panel 260 described previously in connection with Figs. 63-65 wherein it will again be appreciated that a slight amount of compression, as seen in Fig. 77, is possible without buckling the resilient walls of the reinforcement member 264 but additional compression of the panel causes the walls to buckle and fold, as illustrated in Fig. 78, so that the panel is substantially thinner thereby occupying less space within a shipping container. Figs. 80-83 illustrate a sixteenth embodiment 286 of a panel formed in accordance with the present invention. This panel is very similar to the panel described previously in Figs. 60-62 in that it includes a lower planar sheet of material 288 and a reinforcing member 290 with upwardly opening trapezoidal channels 292 spaced by closed triangular shaped channels 294. As will be appreciated, the upwardly opening channels that are of trapezoidal cross-sectional configuration define a space 296 along the upper surface of the reinforcement member between the triangular channels 294. A support member 298, which is best seen in Fig. 80, is positioned across the top of the reinforcement member and extends perpendicularly to the channels in the reinforcement member so as to provide rigidity to the panel in a direction transverse to that provided by the reinforcement member so that the panel is rigidified in perpendicular directions. The support member 298, which can be made of the same material as the planar sheet 288 and the reinforcement member 284 and as seen in Fig. 80, includes a downwardly opening channel-shaped body of inverted U-shaped cross-section projecting away from the reinforcement member and having outwardly directed flanges 300 from which a plurality of tabs 302 are cut and bent to extend downwardly. The cross-section of the tabs 302 is best seen in Fig. 82 to conform generally to the walls and space 296 of the trapezoidal channels in the reinforcement member so as to mechanically connect the support member to the reinforcement member. The support member can, therefore, be mounted on the reinforcement member by positioning the support member perpendicular to the trapezoidal channels and sliding the support member along the length of the channels until it is desirably positioned. A plurality of the downwardly opening support members can be positioned at any desired spacing, as illustrated in Fig. 83. The support members, accordingly, substantially rigidify the panel so that it has very little flexibility in any perpendicular direction. To the extent it is not clear from the above, the connection between the various components of the panels described can be achieved adhesively, ultrasonically, through heat fusion or any other acceptable bonding system. The connections are made where a component engages an upper or lower sheet of the panel or along peaks defined by a component of the panel. It will be appreciated from the above that an improved panel for use in a drop ceiling system or in other similar uses has been provided that has variable features for adjusting the flexibility of the panel in longitudinal or transverse directions and also for varying the compressibility of the panel for shipping purposes. The exposed faces of the panels of this invention can also be modified by adding a continuous elastomeric polymer, such as a urethane or neoprene film or adhesive, as described, by way of example, with regard to the panels of Figs. 13 and 60-62 and/or a decorative film as described, by way of example, with regard to the panel of Fig. 13. Due to the flexible nature of the panels, they can also be easily inserted into the openings defined by the stringers and cross-members of a suspended support system and the panels will not break, as they are not brittle even when being flexed for insertion into the support system. With modifications to the suspension system, it will also be appreciated that the panels could be used in a wall of a building structure. CLAIMS : 1. A flexible ceiling panel that can be folded or flexed while being inserted into an opening in a supporting grid work of a ceiling of a building structure and subsequently unfolded above said grid work so that the panel can be positioned on said grid work ; said panel having substantially the same size as said opening and comprising : - at least one first planar sheet; and - at least one second sheet of a substantially flat material formed into a first reinforcement member that is a three-dimensional self-supporting body having a plurality of elongated cells formed between said first sheet and said first reinforcement member; and wherein said first sheet and said second sheet are each of a slightly rigid but flexible material that comprises heat-resistant fibers bound together by a resin. 2. The panel as claimed in claim 1 wherein said first sheet and said second sheet are of the same slightly rigid but flexible material. 3. The panel as claimed in claim 1 or 2 wherein said first reinforcement member is a furrowed/second sheet defining a plurality of elongated channels confronting with said first sheet. 4. The panel as claimed in claim 3 wherein said first reinforcement member is a furrowed second sheet defining oppositely directed elongated channels, at least some of which are confronting with said first sheet. 5. The panel as claimed in claim 4 or 5 wherein at least some of said channels are of trapezoidal transverse cross-section or of triangular transverse cross-section. 6. The panel as claimed in anyone of claims 1 to 5 wherein said first reinforcement member is secured to said first sheet. 7. The panel as claimed in claim 6 wherein said first reinforcement member is adhesively bonded, heat welded or ultrasonically bonded to said first sheet. 8. The panel as claimed in any one of claims 3 to 5 also comprising a second reinforcement member that is a furrowed sheet defining oppositely directed elongated channels, the channels of said second reinforcement member being less deep than the channels in said first reinforcement member, and wherein said second reinforcement member is overlaid across said first reinforcement member such that at least some of said channels in said second reinforcement member are positioned within channels of said first reinforcement member. 9. The panel as claimed in claim 8 wherein said second reinforcement member is secured to said first reinforcement member. 10. The panel as claimed in claim 8 or 9 wherein there are a pair of said furrowed second reinforcement members, with one overlaid and one underlaid across said first reinforcement member. 11. The panel as claimed in claim 10 wherein each of said second reinforcement members is secured to said first reinforcement member. 12. The panel as claimed in any one of claims 3 to 5 also comprising a second reinforcement portion having planar surfaces extending perpendicularly to said channels in said first reinforcement member. 13. The panel as claimed in claim 12 wherein said second reinforcement portion is of elongated furrowed construction and adapted to be received in one of said channels in said first reinforcement member. 14. The panel as claimed in claim 12 or 13 wherein there are a plurality of said second reinforcement portions with each second reinforcement portion being received in a separate channel of said first reinforcement member. 15. The panel as claimed in any one of claims 1 to 14 comprising a decorative layer of material secured to said first sheet with said first reinforcement member being secured to one face of said first sheet and said decorative layer being secured to an opposite face of said first sheet. 16. The panel as claimed in claim 15 wherein said decorative layer is an elastomeric polymer. 17. The pane! as claimed in claim 16 wherein said elastomeric polymer is a thermoplastic or thermosetting polymeric film. 18. The panel as claimed in any one of claims 1 to 17 wherein said second sheet is of a creasable material. 19. The panel as claimed in any one of claims 1 to 18 comprising two of said first sheets and said first reinforcement member positioned between them. 20. The panel as claimed in claim 19 wherein said two first sheets are secured to said first reinforcement member. 21. The panel as claimed in claim 19 or 20 wherein said first reinforcement member is compressible, allowing the panel to be compressed by moving one of said first sheets perpendicularly toward the other of said first sheets. 22. The panel as claimed in any one of claims 19 to 21 comprising at least two of said first reinforcement members, each between two of said first sheets, so as to define a plurality of elongated cells between said first reinforcement members. 23. The panel as claimed in any one of claims 1 to 19 also comprising at least one support member operatively connected to said first reinforcement member on an opposite side thereof from said first sheet, said support member being elongated and extending perpendicularly to said elongated channels. 24. The panel as claimed in claim 23 wherein said support member is mechanically connected to said first reinforcement member. 25. The panel as claimed in claim 24 wherein said support member comprises tabs adapted to be received in channels of said first reinforcement member to mechanically connect said support member to said first reinforcement member. 26. The panel as claimed in any one of claims 23 to 25 wherein said support member comprises an inverted U-shaped body projecting away from said first reinforcement member. 27. The panel as claimed in any one of claims 23 to 26 wherein said support member is provided with flanges adapted to abut said first reinforcement member. 28. The panel as claimed in any one of claims 23 to 27 wherein said at least one support member and said first reinforcement member are of the same material. 29. The panel as claimed in any one of claims 23 to 28 comprising a plurality of said support members. 30. The panel as claimed in any one of claims 1-29 wherein said material of said first sheet and said material of said second sheet, forming said first reinforcement member, are each a non-woven fabric of heat resistant fibers bound together by a heat moldable polymeric resin matrix or a thermal setting resin matrix. 31. The panel as claimed in claim 30 wherein each of said material of said first sheet and said material of said second sheet comprises glass fibers embedded in a resin. 32. The panel as claimed in claim 31 wherein said material of said second sheet, forming said first reinforcement member, is creased without damaging said glass fibers, to allow said second sheet to be folded while maintaining its integrity. 33. The panel as claimed in claim 31 or 32 wherein said resin is an acrylic resin. 34. The panel as claimed in any one of claims 31 to 33 wherein the length of said glass fibers in said first sheet, said second sheet or both is in the range of one quarter of an inch to one inch. 35. The panel as claimed in any one of claims 31 to 34 wherein the thickness of said glass fibers in said first sheet, said second sheet or both is in the range of seven to one-hundred microns. 36. The panel as claimed in any one of claims 31 to 35 wherein said first sheet and said second sheet are of the same resin and glass fibers. 37. The panel as claimed in any one of claims 1 to 36 wherein said second sheet is formed into said first reinforcement member that is a resilient body. 38. The panel as claimed in any one of claims 1 to 37 wherein said second sheet is formed into said first reinforcement member that is a compressible body. 39. The panel as claimed in any one of claims 1 to 36 wherein said second sheet is formed into said first reinforcement member that is a collapsible body. 40. The panel as claimed in any one of claims 1 to 39 that is incorporated into a ceiling of a building structure. 41. A ceiling system comprising, in combination, a support structure having a plurality of perpendicular support members defining openings therebetween, said support members being adapted to support ceiling panels in said openings, and a ceiling panel in each of said openings as claimed in any one of claims 1 to 40. 42. A method of forming the panel as claimed in any one of claims 1 to 40, comprising the step of: forming said second sheet into said first reinforcement member having said plurality of elongated cells. 43. The method as claimed in claim 42 comprising the step of securing said first reinforcement member to said first sheet, preferably by adhesively bonding, heat welding or ultrasonically bonding. A flexible ceiling panel (108) that can be folded or flexed comprises: - at least one planar sheet (110); and - at least one sheet of a substantially flat material formed into a first reinforcement member (114) that is a three-dimensional self-supporting body having a plurality of elongated cells formed between the planar sheet and the reinforcement member; and wherein the planar sheet and the reinforcement member are each of a slightly rigid but flexible material that comprises heat-resistant fibers bound together by a resin.

Full Text

A FLEXIBLE CEILING PANEL AND A CEILING SYSTEM INCORPORATING
THE SAME
BACKGROUND OF THE INVENTION
Field of the Invention
The present invention relates to a flexible ceiling panel and a ceiling system
incorporating the same. This invention further relates to coverings for the ceilings and
walls of building structures and, more particularly, to a drop ceiling or a wall panel
wherein individual panels are supported on a matrix of support members.
Description of the Relevant Art
The ceilings of building structures have taken numerous forms. Ceilings may be
left unfinished so that rafters or beams of the building structure itself are exposed or the
rafters and beams may be covered as with drywall, wood strips, plaster or other similar
finishes. Walls of building structures may be similarly finished.
Another popular ceiling system is commonly referred to as a drop ceiling where a
plurality of support bars are suspended from the unfinished ceiling so as to form a
matrix having a plurality of side-by-side openings defined between the support bars. The
openings are filled with panels which are typically rigid acoustical panels, with the panels
being supported along their peripheral edge by the support bars. While such drop
ceilings have met with some success, there are numerous disadvantages. One
disadvantage is that there is very little variety in the aesthetics of the ceiling system
since most acoustical panels have the same general appearance, with another
disadvantage residing in the fact that the panels are rigid and brittle so that they are
easily breakable and, further, due to their rigidity, they are difficult to insert into the
opening provided therefor in as much as the support bars must partially protrude into the
opening in order to provide a support surface for the panels.
It is to overcome the shortcomings in prior art drop ceiling systems and to provide
a new and improved cladding system for walls or ceilings that the present invention has
been made.
SUMMARY OF THE INVENTION
The present invention pertains to a new and improved drop ceiling system
wherein a plurality of flexible panels are preferably removably supported on a grid work
of support bars. The support bars may be of inverted T-shaped cross-sectional
configuration and form a matrix from longitudinally extending stringers and laterally
extending cross-members. The flexible panels are sized to fit within the openings defined
by the stringers and cross-members and rest upon ledges of the inverted T-shaped support
members.
The panels can take numerous configurations but include at least one sheet of
somewhat rigid but flexible or foldable material preferably made of a fibrous material
that is reinforced in one of numerous ways so that it can be folded or flexed while being
inserted into an opening in the supporting grid work and subsequently unfolded above the
grid work so that it can be easily positioned on the supporting grid work. In various
disclosed embodiments, the panel can be made to be collapsible or compressible.
The sheet material can be reinforced by a second parallel sheet of material with
support members bridging the space therebetween or it may be reinforced simply by a
plurality of reinforcing members extended along an unexposed, or possibly even exposed,
surface of the sheet material. Where multiple sheets of material are utilized, support
members are provided for retaining the sheet materials in a desired spaced relationship.
The panels so formed provide adequate insulation and also, in most instances,
provide an exposed planar surface that can be covered with a decorative film of various
colors, grains or textural patterns to provide variety to the aesthetics of the ceiling system
once it has been installed.
While the panels have been summarized and will be described hereafter in more
detail as forming part of a ceiling system, it will be apparent tp those skilled in the art that
with modification of the support system the panels could also be used in the walls of a
building structure.
Other aspects, features and details of the present invention can be more
completely understood by reference to the following detailed description of a preferred
embodiment, taken in conjunction with the accompanying drawings and from the
invention as hereinafter claimed.
BRIEF DESCRIPTION OF THE ACCOMPANYING DRAWINGS
Fig. 1 is an isometric view of a panel formed in accordance with a first
embodiment of the present invention.
Fig. 2 is a fragmentary isometric view looking upwardly at a drop ceiling system
in accordance with the present invention utilizing the panels of Fig. 1.
Fig. 3 is an enlarged fragmentary section taken along line 3-3 of Fig. 2.
Fig. 4 is an enlarged side elevation of the panel of Fig. 1.
Fig. 5 is an enlargement of a section of Fig. 4 showing support members for the
panel in dashed lines.
Fig. 6 is an enlarged fragmentary isometric view of the panel of Fig. 1.
Fig. 7 is a view similar to Fig. 6 with a support member of the type shown in
dashed lines in Fig. 5 shown in solid lines.
Fig. 8 is a view similar to Fig. 5 with the panel being folded and with the support
members shown in dashed lines where they would be incorporated if the panel were
fully expanded as shown in Fig. 5.
Fig. 9 is a side elevation of the panel of Fig. 8 after having been fully folded into
a flat condition.
Fig. 10 is a side elevation showing three panels in a fully folded condition and
stacked upon each other.
Fig. 11 is a view similar to Fig. 5 showing the panel partially folded or bent which
facilitates insertion of the panel into a position within the supporting grid work for the
ceiling system.
Fig. 12 is a reduced side elevation similar to Fig. 11 again showing the panel
slightly folded or bent.
Fig. 13 is an exploded isometric view of the panel of Fig. 1 but including a
decorative film layer for covering the lower face of the panel of Fig. 1.
Fig. 14 is an enlarged view of the circled area of Fig. 13.
Fig. 15 is a side elevation of a panel as shown in Fig. 1 with end caps running
along opposite ends of the panel to retain the panel in an expanded condition.
Fig. 16 is an enlarged fragmentary section taken along line 16-16 of Fig. 15.
Fig. 17 is a fragmentary isometric view with parts broken away of the panel
shown in Figs. 15 and 16.
Fig. 18 is a side elevation of a second embodiment of a panel in accordance with
the present invention with the panel shown folded in dotted lines.
Fig. 19 is an enlarged fragmentary side elevation of a portion of the panel shown
in Fig. 18.
Fig. 20 is a fragmentary isometric of the panel as shown in Fig. 19.
Fig, 21 is a side elevation of a third embodiment of a panel in accordance with the
present invention with the panel being similar to the panel shown in Fig- 18 but with a
second parallel sheet of material.
Fig. 22 is an enlarged fragmentary side elevation of a portion of the panel of Fig.
21.
Fig. 23 is an enlarged fragmentary isometric view of the panel shown in Fig. 21.
Fig. 24 is a fragmentary isometric view of the reinforcement portion of the panel
of Fig. 21 showing a first method of applying glue to the reinforcement.
Fig. 25 is a view similar to Fig. 24 with a second method of applying glue to the
reinforcement material.
Fig. 26 is a view similar to Fig. 24 illustrating a third method of applying glue to
the reinforcement.
Fig. 27 is a side elevation similar to Fig. 21 with the panel of Fig. 21 having been
partially compressed.
Fig. 28 is an enlarged fragmentary section of the panel as seen in Fig. 27.
Fig. 29 is a fragmentary section similar to Fig. 28 with the panel having been
further compressed.
Fig. 30 is an isometric view of the panel as shown in Fig. 27 partially compressed.
Fig. 31 is a side elevation of a fourth embodiment of a panel formed in
accordance with the present invention.
Fig. 32 is an enlarged fragmentary section of a portion of the panel as shown in
Fig. 31.
Fig. 33 is a fragmentary section similar to Fig. 32 with the panel partially
compressed.
Fig. 34 is a fragmentary isometric of the panel shown in Fig. 31.
Fig. 35 is a side elevation of a fifth embodiment of a panel formed in accordance
with the present invention.
Fig. 35A is an enlargement of the circled area of Fig. 36.
Fig. 36 is an enlarged fragmentary section illustrating a portion of the panel
shown in Fig. 35.
Fig. 37 is a fragmentary section similar to Fig. 36 with the panel having been
partially compressed.
Fig. 38 is a fragmentary isometric of the panel shown in Fig. 35.
Fig. 39 is a side elevation of a sixth embodiment of a panel formed in accordance
with the present invention.
Fig. 40 is an enlarged fragmentary section of a portion of the panel shown in Fig.
39.
Fig. 41 is a fragmentary isometric of the portion of the panel shown in Fig. 40.
Fig. 42 is a side elevation of a panel similar to that shown in Fig. 39 with a
parallel sheet of material added to the panel.
Fig. 43 is a fragmentary vertical section of a portion of the panel shown in Fig.
42.
Fig. 44 is a fragmentary isometric of the portion of the panel shown in Fig. 43.
Fig. 45 is a side elevation of the panel shown in Fig. 39 with a fold or curve
formed in the panel.
Fig. 45 A is an enlarged view similar to Fig. 45 showing the reinforcement portion
of the panel of Fig. 45 in solid lines and parallel sheets connected to the reinforcement
portion in dashed lines.
Fig. 46 is a fragmentary vertical section through a seventh embodiment of a panel
formed in accordance with the present invention.
Fig. 47 is an isometric view of an eighth embodiment of a panel formed in
accordance with the present invention.
Fig. 48 is an exploded isometric view of the panel shown in Fig. 47.
Fig. 49 is an isometric view of a secondary reinforcement strip used in the panel
of Fig. 47.
Fig. 50 is an isometric view of the reinforcement structure for the panel shown
in Fig. 47.
Fig. 51 is an isometric view of a sheet of material illustrating how the secondary
reinforcement shown in Fig. 49 can be cut from such a sheet.
Fig. 52 is a side elevation of the panel shown in Fig. 47 looking upwardly and to
the right from the lower lefthand side of the panel as shown in Fig. 47.
Fig. 53 is an enlarged section taken along line 53-53 of Fig. 52.
Fig. 54 is a section taken along line 54-54 of Fig. 53.
Fig. 55 is a section taken along line 55-55 of Fig. 56 and similar to Fig. 53
showing the panel partially compressed.
Fig. 56 is a section taken along line 56-56 of Fig. 55 and being similar to Fig. 54
with the panel partially compressed.
Fig. 57 is a side elevation of aninth embodiment of apanel formed in accordance
with the present invention.
Fig. 58 is a fragmentary vertical section taken through a portion of the panel
shown in Fig. 57.
Fig. 59 is a fragmentary isometric of the portion of the panel illustrated in Fig. 58.
Fig. 60 is a side elevation of a tenth embodiment of a panel formed in accordance
with the present invention.
Fig. 61 is a fragmentary vertical section taken through the panel of Fig. 60.
Fig. 62 is a fragmentary isometric showing the portion of the panel illustrated in
Fig. 61.
Fig. 63 is a side elevation of an eleventh embodiment of a panel formed in
accordance with the present invention.
Fig. 64 is an enlarged fragmentary vertical section showing a portion of the panel
of Fig. 63.
Fig. 65 is a fragmentary isometric showing the portion of the panel illustrated in
Fig. 64.
Fig. 66 is a side elevation of a twelfth embodiment of a panel formed in
accordance with the present invention.
Fig. 67 is an enlarged vertical section taken through a portion of the panel shown
in Fig. 66.
Fig. 68 is a fragmentary isometric view illustrating the portion of the panel shown
in Fig. 67.
Fig. 69 is a side elevation of a thirteenth embodiment of a panel formed in
accordance with the present invention.
Fig. 70 is an enlarged vertical section taken through a portion of the panel shown
in Fig. 69.
Fig. 71 is a fragmentary isometric illustrating the portion of the panel shown in
Fig. 70.
Fig. 72 is a side elevation of a fourteenth embodiment of a panel formed in
accordance with the present invention.
Fig. 73 is an enlarged vertical section taken through a portion of the panel shown
in Fig. 72.
Fig. 74 is a vertical section similar to Fig. 73 showing the panel partially
compressed.
Fig. 75 is a fragmentary isometric of the portion of the panel shown in Figs. 73
and 74.
Fig. 76 is a side elevation of a fifteenth embodiment of a panel formed in
accordance with the present invention.
Fig. 77 is an enlarged vertical section taken through a portion of the panel shown
in Fig. 76.
Fig. 78 is a vertical section similar to Fig. 77 showing the panel partially
compressed.
Fig. 79 is a fragmentary isometric of the portion of the panel shown in Figs. 77
and 78.
Fig. 80 is a fragmentary isometric view of a support member adapted for use in
connection with the panel shown in Fig. 60.
Fig. 81 is an end elevation of the support member shown in Fig. 80.
Fig. 82 is an end elevation of the support member incorporated into the panel of
Fig. 60.
Fig. 83 is a side elevation of the pane] of Fig.60 with the support member of Fig.
80 incorporated therein.
DESCRIPTION OF THE PREFERRED EMBODIMENTS
A drop ceiling system 100 in accordance with the present invention utilizes a
conventional suspension system of elongated crisscrossing support members 102 forming
a matrix defining openings that are usually rectangular in shape in which a panel in
accordance with the present invention can be disposed. The support members typically
consist of horizontally disposed elongated stringers 102a that are suspended in a
conventional manner and in parallel relationship in one direction across a ceiling
structure usually at a vertical spacing of four to six inches from the substructure of the
building structure in which the ceiling system is mounted. A plurality of horizontal
cross-support members 102b extend in parallel relationship and perpendicularly to the
stringers so that the quadrangular openings are defined therebetween. The cross-
members are also suspended at the same elevation as the stringers. The stringers and
cross-members are of inverted T-shaped cross-section as illustrated in Fig. 3 so as to
define horizontal shoulders 104 on either side of a vertical body 106, with the shoulders
being adapted to support a peripheral edge of a panel formed in accordance with the
present invention. As will be appreciated, the T-shaped support members 102 extend
peripherally around each quadrangular opening so that a shoulder is provided to support
an entire peripheral edge of a panel.
Other types of suspension systems could be utilized, but a suspension system of
the type described has proven to be very functional.
A first embodiment 108 of a panel in accordance with the present invention is
illustrated in Figs. 1-17. As probably best seen in Fig. 5, each panel 108 includes an
upper planar sheet 110, a lower planar sheet 112 and a plurality of parallel reinforcement
members 114 of substantially S-shaped cross-section. The upper and lower planar
sheets as well as the reinforcement members are made of a somewhat rigid material
that can be flexed. A material that has worked for this purpose is a non-woven fabric of
heat resistant fibers bound together by a heat moldable polymeric resin matrix or a
thermal setting resin matrix. For example, fiberglass fibers embedded in an acrylic resin
will work for this purpose with the fibers preferably being relatively long and thin. The
length of the glass fibers would be at least 1/4 inch, but preferably !4 inch and especially
at least one inch. The thickness of the glass fibers would be no less than 7 microns and
no more than 100 microns but preferably no more than 32 microns and especially 10-16
microns. A material found suitable for this purpose is 100GSM glass mat #8802
manufactured by Johns Manville of Waterville, Ohio, or an alternative would be
materials available from OJI Glasspen in Japan and Ahlstrom in Finland.
The upper and lower sheets of material are cut to a predetermined size which
corresponds with the area defined by the stringers 102a and cross-members 102b of
the support system. As will be appreciated, the upper and lower sheets of material are
retained in a parallel and separated relationship by the reinforcement members 114
which are formed from elongated strips of material 116 that are pre-creased at
predetermined locations so that they can be folded at right angles at those locations.
The strips of material are also cut to pre-determined lengths to form the reinforcement
members.
The creases are provided at the locations where the strip material 116 is to be
folded and these locations are spaced from each edge of the strip approximately one-
quarter of the full width of the strip. In this manner, when the strips are folded as
illustrated in Figs. 5 and 11, they define an upper flap 124 and a lower flap 126 and an
intermediate body 128 which is approximately twice the width of each of the flaps.
The crease lines, of course, allow the flaps to be folded relative to the
intermediate body. By taking care when creasing the strips that the glass fibers
not be damaged, alternative means for maintaining resiliency in the strip
material need not be employed as the glass fibers provide the desired
resiliency in the material. Each flap is provided with an adhesive on its
outer surface to engage the adjacent sheet material 110 or 112 so as to be securely
bonded thereto. The adhesive could take numerous forms but a porous adhesive
made by EMS-Chemie AG of Domat/Ems, Switzerland and designated flame resistant
co-polyester adhesive #1533 has been found acceptable.
As will be appreciated, due to the creases in the reinforcement members, and the
capability of the strip material 116 to bend along these creases, the reinforcement
members by themselves may not necessarily retain the sheet material 110, 112 in spaced
relationship rendering the panel collapsible by moving the sheets of material toward each
other while they slightly shift laterally relating to each other. To prevent collapsing,
diagonal support members 130 of a more rigid plastic material or conceivably the same
glass fiber reinforced resin material maybe diagonally inserted into each cell 132 defined
between the sheet material and adjacent reinforcement members. These support members
130 are illustrated in dashed lines in Fig. 5 and in full lines in Fig. 7. The support
members can be inserted in every cell or in spaced cells as is necessary to support the
panel as desired. Even with the support members inserted in each cell, however, the
panel can be slightly flexed or bent as illustrated in Figs. 11 or 12. As will be
appreciated, due to the flexibility of the panels, they can be easily inserted into the
openings between the stringers 102a and cross-members 102b even though the overall
fully extended size of the panel 108 is substantially equal to the size of that opening.
This, of course, provides a distinct advantage over systems in the prior art where rigid
panels that could not be bent or flexed have to be inserted into an opening of about the
same size.
By inserting support members at specified selected locations, but not in all the
cells, the panel will take a curved shape that may be useful or appealing in some
situations.
The reinforcement members 114 can be adhesively bonded to the sheet material
110,112 in any suitable manner but, by way of example, the adhesive could be provided
to cover the entire face of a flap 124 or 126, could be provided in continuous lines along
the flap but not of the full width of the flap, could be provided in intermittent lines along
the flap or other such applications. It is conceivable that the reinforcement member could
also be heat welded or ultrasonically bonded to the sheet material as well.
It will be appreciated by reference to Figs. 8-10 that by removing the support
strips 130 from each cell, the panel 108 can be collapsed by folding the reinforcement
members 114 along their creases 122 so that the reinforcement members are flattened and
extend in parallel relationship with the upper and lower sheets 110 and 112, respectively,
as illustrated in Fig. 9. In this configuration, panels can be stacked as illustrated in Fig.
10 into a small area for shipping purposes thereby saving considerable expense when
shipping panels for use in a drop ceiling system.
With reference to Fig. 13, it will be appreciated that the panel 108 as described
above can be modified by incorporating a decorative continuous layer of elastomeric
polymer, preferably a thermoplastic or thermosetting polymeric film 134 or the like, such
as a urethane or neoprene film, to the lower exposed face of the lower sheet 112, which
face is the face that is exposed to the interior of the room in which the ceiling system is
mounted. The film material can be simply a flat sheet of colored material, could be
furrowed or otherwise embossed with a pattern, or could have a wood grain or other
decorative pattern imprinted thereon. There are numerous possibilities for decorating the
lower surface of the panel and this film or related sheet of material can be adhesively or
otherwise secured to the panel along the bottom face of the lower sheet of material 112
of the panel. A decorative film as described above or other material may also be applied
to the other panel embodiments of this invention, which are described below.
Examples of decorative coverings or films would be:
a) supported vinyl wall coverings made by Gen Corp. of Columbus, Miss.
b) unsupported vinyl films as used in wrapping operations from Alkor Draka
of
Munich, Germany.
c) flame resistant papers made by Pallas Inc. of Green Bay, Wisconsin.
d) flame resistant papers made by Permalin Products Co. of New York, New
York.
e) woven fiberglass mat from Johns Manville of Waterville, Ohio.
f) a flame resistant non-woven #TR2315B-1 from H & V of Floyd, VA
which has been quilted by Hunter Douglas Inc. of Broomfield, Colorado.
g) a flame resistant glass paint on a glass non-woven fabric with the paint
bring manufactured by Keim of Holland. The glass non-woven fabric would come from
Alkstrom of Finland.
As an alternative to the diagonal support members shown in dashed lines in Fig.
5, elongated end caps 136 as shown in Figs. 15-17 could be utilized. These end caps
could simply be elongated U-shaped channel members of a rigid material which are
adapted to fit snugly over the end of the aforedescribed panel 108 in perpendicular
relationship to the longitudinal direction of the reinforcement members 114. As will be
appreciated, the end caps prevent the panel from collapsing, as illustrated in Figs. 8 and
9, and, of course, could be removed from the panel for shipping purposes and installed
on the panel once the panels were ready for installation in a ceiling system. As an
alternative the end caps could also be slit to fit within the open end of the panel instead
of around the end. By way of example, the end caps could be made of a flame resistant
polycarbonate or aluminum and adhesively secured to the panels 108.
Figs. 18-20 illustrate a second embodiment 138 of a panel in accordance with the
present invention wherein a lower sheet material 140 is reinforced principally in one
direction by a furrowed reinforcing sheet 142 that is folded as illustrated in Fig. 19 to
define upwardly and downwardly opening trapezoidal channels 144. The trapezoidal
channels would be bonded where the reinforcement member is in contiguous abutting
face-to-face relationship with the lower sheet material 140. As mentioned previously, the
bonding could be done in any variety of ways so long as a positive bond was provided
between the reinforcing member and the lower sheet material. As will be appreciated,
with an arrangement of this type, the panel can be flexed upwardly in a smooth curve, as
illustrated in Fig. 18, and to a smaller degree downwardly but only in one direction of the
panel. The trapezoidal channels 144 substantially prevent flexing in a transverse
direction to that illustrated. This ability to flex the panel, however, allows the panel to
be easily inserted into the opening between the stringers 102a and cross-members 102b
in the support structure for the ceiling system. The stiffness of the panel can also be
adjusted by the stiffness or rigidity of the lower sheet material 140.
In a third embodiment 146 of the present invention, seen in Figs. 21-30, the
ceiling panel 146 is formed similarly to the panel illustrated in Figs. 18-20 but wherein
an upper sheet material 148 is secured to the trapezoidal reinforcement member 142
along the top surface of the trapezoidal member. The upper sheet material can be
adhesively bonded or otherwise secured to the reinforcement member in the same or
similar manner as the reinforcement member was secured to the lower sheet material 140.
As illustrated in Fig. 24, the bonding of the reinforcement member 142 to the sheet
material can be with a full layer of adhesive 150 or, as illustrated in Fig. 25, with a single
line of adhesive 150 or, as illustrated in Fig. 26, with parallel lines of adhesive 150 or,
as mentioned previously, many other methods of applying adhesive such as intermittently
or in dots or the like could also be employed. Again, heat welding or ultrasonic bonding
may also be appropriate.
The completed panel 146 is probably best seen in Fig. 23 and, again, will bend
or flex in one direction of the panel but is substantially prevented from flexing in a lateral
or perpendicular direction due to the trapezoidally shaped channels of the reinforcement
member 142. The reinforcement member can be formed from a sheet of material that has
been creased in opposite faces at spaced parallel locations and subsequently folded.
The panel 146 can be compressed for shipping purposes, as illustrated in Figs. 27-
30, with a slight amount of compression probably not appreciably changing the
configuration of the panel other than to make it slightly thinner, but further compression
causing the straight faces 160 of the reinforcement member to buckle or fold into the
contoured configuration shown in Fig. 29. Accordingly, the panels can be forcibly
compressed for shipping purposes so as not to occupy as much space within a shipping
container and by utilizing an appropriate material for the panels, such as a glass
reinforced resin as described previously, the panels will reassume their normal
configuration of Figs. 21 and 22.
For purposes of the present disclosure, the term "compression" refers to reducing
the thickness of a panel without allowing the upper and lower sheets to shift laterally
relative to each other while the term "collapsing" refers to reducing the thickness of a
panel while permitting lateral shifting of the upper and lower sheets relative to each other.
If there were no upper sheet, such as in the embodiment shown in Figs. 18-20,
"compression" would occur if the furrowed reinforcing sheet were not allowed to fold
laterally as if it were "collapsing" but rather was buckled straight downwardly.
Fig. 31 illustrates a fourth embodiment 162 of the present invention where, again,
upper and lower planar sheets of material 164 and 166, respectively, are separated by a
furrowed reinforcement member 168 that defines upwardly and downwardly opening
channels 170 of trapezoidal cross-section but in this embodiment of the invention, the
engagement area of the reinforcement member 168 with each planar sheet member 164,
166 is less than the corresponding engagement areas of the panel shown in Figs. 21 and
22. This allows for a more compressible panel and as will be appreciated, by varying the
area of engagement between the reinforcement member and the planar sheet members,
the compressibility of the panel can be regulated. Fig. 33 shows the panel 162 in a
somewhat compressed configuration but when utilizing appropriate resilient materials,
the panel will return to the normal configuration illustrated in Fig. 32 upon the release of
pressure due to the resiliency of the material utilized.
Figs. 35-38 illustrate a fifth embodiment 172 of the present invention which is
somewhat similar to those shown in Figs. 21-22 and 31-32 so as to include upper and
lower sheets of planar material 174 and 176, respectively, and a reinforcing member 178
therebetween but wherein the reinforcing member is defined by upwardly and
downwardly opening channels 180 that are of substantially triangular configuration. In
this arrangement, the engagement of the reinforcing member 178 with each planar sheet
material 174,176 is a relatively small area which allows even more compressibility of
the panel. Fig. 35A is an enlargement of the circled area in Fig. 36 and shows a line of
adhesive 182 along a substantially pointed line of engagement of the reinforcement
member 178 with the upper planar sheet member 174.
A sixth embodiment 184 of the panel of the present invention is illustrated in
Figs. 39-41 and can be seen to include a lower planar sheet material 186, a primary
reinforcement member 188 substantially of the type shown in Fig. 18, and a secondary
reinforcement member 190 overlaid on the primary reinforcement member 188.
The primary reinforcement member 188 defines upwardly and downwardly
opening channels 192 of trapezoidal cross-sectional configuration and is bonded to the
lower planar sheet material 186 along areas of engagement 194. The secondary
reinforcement member 190 is overlaid across the top of the primary reinforcement
member and also defines upwardly and downwardly opening channels 196 of trapezoidal
configuration but wherein the upwardly opening channels are wider than the downwardly
opening channels. The downwardly opening channels are sized to conform with and
receive the uppermost structure of a downwardly opening channel of the primary
reinforcement member 188. The upwardly opening channels of the secondary
reinforcement member 190 are adapted to be received in an upwardly opening channel
of the primary reinforcement member. The secondary reinforcement member is secured
to the primary reinforcement member in any suitable manner such as with adhesive and
either continuously or at intermittent locations only along horizontal areas of engagement
198. The panel so formed, again, will flex in one direction but not as readily flex in the
lateral transverse direction and Fig. 45 illustrates the panel when so flexed. It will be
appreciated that the secondary reinforcement member flexes outwardly across the
upwardly opening channels 192 of the primary reinforcement member to allow for the
bend in the panel. This, of course, is permitted due to the fact that the secondary
reinforcement member is not bonded to the primary reinforcement member in the
upwardly opening channels of the primary reinforcement member but only along the top
or horizontal areas of engagement 198 with the primary reinforcement member.
Figs. 42-44 illustrate an alterative arrangement 200 to the panel illustrated in Figs.
39 and 40, with this alternative arrangement being identical to the arrangement shown in
Figs. 39 and 40 but wherein an is bonded to the secondary reinforcement member 190 in
parallel relationship with the lower planar sheet member 186. A panel so formed could
also be bent as illustrated in Fig. 45 A where the planar sheet members 186 and 202 are
illustrated in dashed lines.
Fig. 46 illustrates a seventh embodiment 204 of a panel in accordance with the
present invention wherein the panel 204 includes upper and lower planar sheets of
material 206 and 208, respectively, a primary reinforcement member 210 and a pair of
upper and lower secondary reinforcement members 212 and 214, respectively. The
primary reinforcement member has upwardly and downwardly opening channels 216 of
trapezoidal configuration but the primary reinforcement member is not directly attached
to the planar sheet materials. Rather, the secondary reinforcement members 212 and 214,
respectively, are secured to the primary reinforcement member 210 along horizontal
interfaces 218 between the respective members and, in turn, the secondary reinforcement
members are secured to the planar sheet members along horizontal engagement areas
220. The secondary reinforcement members are identical to each other but inverted
relative to each other so as to be secured to the primary reinforcement member across the
top and bottom thereof substantially as described previously in connection with the
embodiment of the invention shown in Figs. 39 and 40.
Figs. 47-56 illustrate an eighth embodiment 222 of the present invention wherein
a pair of parallel planar sheets 224 and 226 are interconnected by a reinforcement
member 228 that includes a primary reinforcement portion 230 and secondary
reinforcement portions 232 which provide rigidity in a transverse direction to the primary
portion. As best illustrated in Figs. 49 and 50, the primary reinforcement portion 230 is
a furrowed member substantially the same as the primary reinforcement member of Fig.
39 thereby defining upwardly and downwardly opening channels 234 of trapezoidal
cross-section. The secondary reinforcement portions 232 are insert strips, as illustrated
in Fig. 49, that are adapted to be received in the upwardly opening channels of the
primary reinforcement portion. Each secondary reinforcement strip has a cross-sectional
configuration substantially identical to that of the primary portion, but the planar side
walls 236 of the strip, which extend perpendicularly to the channels in the primary
reinforcement portion, are tapered so as to converge downwardly thereby to conform with
the downwardly convergent walls 238 of the upwardly opening channels of the primary
portion of the reinforcement member. Accordingly, when the secondary reinforcement
strips are positioned within the upwardly opening channels of the primary reinforcement
portion, the reinforcement member is structured as illustrated in Fig. 50, and it will be
appreciated that the panel has substantial rigidity in both longitudinal and transverse
directions even though a slight degree of flexing is achievable due to the characteristics
of the material from which the reinforcement member is made.
Fig. 51 illustrates a sheet of material 240 from which the secondary reinforcement
portions can be cut and folded and as will be appreciated, a number of such strips 232 can
be cut in a complimentary manner from the same sheet of material.
Figs. 55 and 56 illustrate the compressible nature of the panel 222 which is
permitted due to the flexible nature of the material from which the reinforcement member
228 is made and as will be appreciated, depending upon the amount of pressure applied
to the planar sheet members 224 and 226, the reinforcement members will buckle into
the contoured configuration illustrated allowing the panel to assume a thinner or
shallower cross-section, again, for shipping purposes. In other words, the panels can be
forcibly compressed into containers for shipment so as to occupy a minimal amount of
space compared to that which would be occupied by the fully expanded panel.
Figs. 57-59 illustrate a ninth embodiment 242 of the panel of the present
invention which includes a lower planar sheet of material 244 and a reinforcement
member 246 bonded or otherwise secured to the upper surface thereof to permit easy
flexing of the panel in a downward direction but the reinforcement member resists
flexing of the panel in an upwardly direction and transverse directions. The
reinforcement member has alternate upwardly and downwardly opening channels 248 of
trapezoidal cross-sectional configuration but the opening of each channel is significantly
narrower than the opposed closed side of the same channel. As will be appreciated, the
panel would be allowed to flex readily in a downward direction but not so readily in an
upward direction and not so readily in a transverse direction. The reinforcement member
is secured to the planar sheet material along areas of engagement in any suitable manner
which could include adhesive applied in lines, continuously across the areas of
engagement, along intermittent lines or dots or the like.
A tenth embodiment 250 of a panel formed in accordance with the present
invention is illustrated in Figs. 60-62. In this embodiment, a planar sheet of material 252
is bonded or otherwise secured in a suitable manner to an overlying reinforcement
member 254 that is similar to the reinforcement member shown in the embodiment
illustrated in Fig. 58 but wherein the upwardly opening trapezoidal channels 256 of the
reinforcement member are significantly wider than the downwardly opening channels
258. This arrangement would permit not only flexing in the downward direction but also
more flexing in the upward direction than would be permitted by the embodiment shown
in Figs. 57-59. The lower exposed face of the sheet 252, which face is exposed to the
interior of the room in which the ceiling system is mounted, can be modified by providing
it with a continuous elastomeric polymer (not shown). Preferably, the elastomeric
polymer is a thermoplastic or thermosetting polymeric film, such as a urethane or
neoprene film, as described previously with reference to Fig. 14, or a urethane or
neoprene adhesive that bonds a decorative film, as described above with reference to Fig.
14, on the lower face of the sheet 252. The elastomeric polymer allows the panel 250 to
be substantially flexed or bent without visible creasing of the sheet 252. As a result, the
panel 250 can be manufactured in long lengths which can be stored and shipped in rolled-
up form and then unrolled and cut to length for installation.
An eleventh embodiment 260 of a panel in accordance with the present invention
is illustrated in Figs. 63-65. This embodiment is identical to that illustrated in Figs. 57-
59 except that an upper pianar sheet of material 262 is secured to a reinforcement
member 264 across the top of the reinforcement member in the same or similar manner
to which a bottom sheet material 266 is secured to the lower surface of the reinforcement
member. This panel would have similar behavioral characteristics to that of the panel
illustrated in Fig. 58 but would have slightly more rigidity and better insulating qualities.
Figs. 66-68 illustrate a twelfth embodiment 268 of a panel formed in accordance
with the present invention, with this embodiment including upper and lower planar sheets
of material 270 and 272, respectively, that are secured to and separated by a
reinforcement member 274 having upwardly and downwardly opening channels 276 of
transverse trapezoidal configuration. The reinforcement member is similar to that of Fig.
58 except that the trapezoidal cross-section is slightly enlarged so that the opening of the
trapezoidal channels in both the upward and downward directions is slightly greater than
that of the reinforcement member of Fig. 58.
A thirteenth embodiment 278 of a panel formed in accordance with the present
invention is illustrated in Figs. 69-71, with this panel, including upper and lower planar
sheet materials 280 and 282, respectively, that are interconnected by and spaced by a
reinforcement member 284. The reinforcement member is substantially identical to that
illustrated in the embodiment of Figs. 60 and 61.
Figs. 72-75 illustrate the compressibility of the panel 268 described previously
in connection with Figs. 66-68 and wherein it will be appreciated in Fig. 73 that the panel
can be compressed a slight amount without buckling the resilient walls of the
reinforcement member 274, but additional compression allows the walls of the
reinforcement member to further fold relative to each other into the configuration
illustrated in Fig. 74. The walls will actually buckle so that the panel can be substantially
compressed for cost savings during shipment.
Figs. 76-79 illustrate the compressibility of the panel 260 described previously
in connection with Figs. 63-65 wherein it will again be appreciated that a slight amount
of compression, as seen in Fig. 77, is possible without buckling the resilient walls of the
reinforcement member 264 but additional compression of the panel causes the walls to
buckle and fold, as illustrated in Fig. 78, so that the panel is substantially thinner thereby
occupying less space within a shipping container.
Figs. 80-83 illustrate a sixteenth embodiment 286 of a panel formed in accordance
with the present invention. This panel is very similar to the panel described previously
in Figs. 60-62 in that it includes a lower planar sheet of material 288 and a reinforcing
member 290 with upwardly opening trapezoidal channels 292 spaced by closed triangular
shaped channels 294. As will be appreciated, the upwardly opening channels that are of
trapezoidal cross-sectional configuration define a space 296 along the upper surface of
the reinforcement member between the triangular channels 294. A support member 298,
which is best seen in Fig. 80, is positioned across the top of the reinforcement member
and extends perpendicularly to the channels in the reinforcement member so as to provide
rigidity to the panel in a direction transverse to that provided by the reinforcement
member so that the panel is rigidified in perpendicular directions.
The support member 298, which can be made of the same material as the planar
sheet 288 and the reinforcement member 284 and as seen in Fig. 80, includes a
downwardly opening channel-shaped body of inverted U-shaped cross-section projecting
away from the reinforcement member and having outwardly directed flanges 300 from
which a plurality of tabs 302 are cut and bent to extend downwardly. The cross-section
of the tabs 302 is best seen in Fig. 82 to conform generally to the walls and space 296 of
the trapezoidal channels in the reinforcement member so as to mechanically connect the
support member to the reinforcement member. The support member can, therefore, be
mounted on the reinforcement member by positioning the support member perpendicular
to the trapezoidal channels and sliding the support member along the length of the
channels until it is desirably positioned. A plurality of the downwardly opening support
members can be positioned at any desired spacing, as illustrated in Fig. 83. The support
members, accordingly, substantially rigidify the panel so that it has very little flexibility
in any perpendicular direction.
To the extent it is not clear from the above, the connection between the various
components of the panels described can be achieved adhesively, ultrasonically, through
heat fusion or any other acceptable bonding system. The connections are made where a
component engages an upper or lower sheet of the panel or along peaks defined by a
component of the panel.
It will be appreciated from the above that an improved panel for use in a drop
ceiling system or in other similar uses has been provided that has variable features for
adjusting the flexibility of the panel in longitudinal or transverse directions and also for
varying the compressibility of the panel for shipping purposes. The exposed faces of the
panels of this invention can also be modified by adding a continuous elastomeric
polymer, such as a urethane or neoprene film or adhesive, as described, by way of
example, with regard to the panels of Figs. 13 and 60-62 and/or a decorative film as
described, by way of example, with regard to the panel of Fig. 13. Due to the flexible
nature of the panels, they can also be easily inserted into the openings defined by the
stringers and cross-members of a suspended support system and the panels will not break,
as they are not brittle even when being flexed for insertion into the support system. With
modifications to the suspension system, it will also be appreciated that the panels could
be used in a wall of a building structure.
CLAIMS :
1. A flexible ceiling panel that can be folded or flexed while being inserted
into an opening in a supporting grid work of a ceiling of a building structure and
subsequently unfolded above said grid work so that the panel can be positioned
on said grid work ; said panel having substantially the same size as said opening
and comprising :
- at least one first planar sheet; and
- at least one second sheet of a substantially flat material formed into a
first reinforcement member that is a three-dimensional self-supporting
body having a plurality of elongated cells formed between said first sheet
and said first reinforcement member; and
wherein said first sheet and said second sheet are each of a slightly rigid but
flexible material that comprises heat-resistant fibers bound together by a resin.
2. The panel as claimed in claim 1 wherein said first sheet and said second
sheet are of the same slightly rigid but flexible material.
3. The panel as claimed in claim 1 or 2 wherein said first reinforcement
member is a furrowed/second sheet defining a plurality of elongated channels
confronting with said first sheet.
4. The panel as claimed in claim 3 wherein said first reinforcement member
is a furrowed second sheet defining oppositely directed elongated channels, at
least some of which are confronting with said first sheet.
5. The panel as claimed in claim 4 or 5 wherein at least some of said
channels are of trapezoidal transverse cross-section or of triangular transverse
cross-section.
6. The panel as claimed in anyone of claims 1 to 5 wherein said first
reinforcement member is secured to said first sheet.
7. The panel as claimed in claim 6 wherein said first reinforcement member
is adhesively bonded, heat welded or ultrasonically bonded to said first sheet.
8. The panel as claimed in any one of claims 3 to 5 also comprising a
second reinforcement member that is a furrowed sheet defining oppositely
directed elongated channels, the channels of said second reinforcement member
being less deep than the channels in said first reinforcement member, and
wherein said second reinforcement member is overlaid across said first
reinforcement member such that at least some of said channels in said second
reinforcement member are positioned within channels of said first reinforcement
member.
9. The panel as claimed in claim 8 wherein said second reinforcement
member is secured to said first reinforcement member.
10. The panel as claimed in claim 8 or 9 wherein there are a pair of said
furrowed second reinforcement members, with one overlaid and one underlaid
across said first reinforcement member.
11. The panel as claimed in claim 10 wherein each of said second
reinforcement members is secured to said first reinforcement member.
12. The panel as claimed in any one of claims 3 to 5 also comprising a
second reinforcement portion having planar surfaces extending perpendicularly
to said channels in said first reinforcement member.
13. The panel as claimed in claim 12 wherein said second reinforcement
portion is of elongated furrowed construction and adapted to be received in one
of said channels in said first reinforcement member.
14. The panel as claimed in claim 12 or 13 wherein there are a plurality of
said second reinforcement portions with each second reinforcement portion
being received in a separate channel of said first reinforcement member.
15. The panel as claimed in any one of claims 1 to 14 comprising a
decorative layer of material secured to said first sheet with said first
reinforcement member being secured to one face of said first sheet and said
decorative layer being secured to an opposite face of said first sheet.
16. The panel as claimed in claim 15 wherein said decorative layer is an
elastomeric polymer.
17. The pane! as claimed in claim 16 wherein said elastomeric polymer is a
thermoplastic or thermosetting polymeric film.
18. The panel as claimed in any one of claims 1 to 17 wherein said second
sheet is of a creasable material.
19. The panel as claimed in any one of claims 1 to 18 comprising two of said
first sheets and said first reinforcement member positioned between them.
20. The panel as claimed in claim 19 wherein said two first sheets are
secured to said first reinforcement member.
21. The panel as claimed in claim 19 or 20 wherein said first reinforcement
member is compressible, allowing the panel to be compressed by moving one of
said first sheets perpendicularly toward the other of said first sheets.
22. The panel as claimed in any one of claims 19 to 21 comprising at least
two of said first reinforcement members, each between two of said first sheets,
so as to define a plurality of elongated cells between said first reinforcement
members.
23. The panel as claimed in any one of claims 1 to 19 also comprising at least
one support member operatively connected to said first reinforcement member
on an opposite side thereof from said first sheet, said support member being
elongated and extending perpendicularly to said elongated channels.
24. The panel as claimed in claim 23 wherein said support member is
mechanically connected to said first reinforcement member.
25. The panel as claimed in claim 24 wherein said support member comprises
tabs adapted to be received in channels of said first reinforcement member to
mechanically connect said support member to said first reinforcement member.
26. The panel as claimed in any one of claims 23 to 25 wherein said support
member comprises an inverted U-shaped body projecting away from said first
reinforcement member.
27. The panel as claimed in any one of claims 23 to 26 wherein said support
member is provided with flanges adapted to abut said first reinforcement
member.
28. The panel as claimed in any one of claims 23 to 27 wherein said at least
one support member and said first reinforcement member are of the same
material.
29. The panel as claimed in any one of claims 23 to 28 comprising a plurality
of said support members.
30. The panel as claimed in any one of claims 1-29 wherein said material of
said first sheet and said material of said second sheet, forming said first
reinforcement member, are each a non-woven fabric of heat resistant fibers
bound together by a heat moldable polymeric resin matrix or a thermal setting
resin matrix.
31. The panel as claimed in claim 30 wherein each of said material of said
first sheet and said material of said second sheet comprises glass fibers
embedded in a resin.
32. The panel as claimed in claim 31 wherein said material of said second
sheet, forming said first reinforcement member, is creased without damaging
said glass fibers, to allow said second sheet to be folded while maintaining its
integrity.
33. The panel as claimed in claim 31 or 32 wherein said resin is an acrylic
resin.
34. The panel as claimed in any one of claims 31 to 33 wherein the length of
said glass fibers in said first sheet, said second sheet or both is in the range of
one quarter of an inch to one inch.
35. The panel as claimed in any one of claims 31 to 34 wherein the thickness
of said glass fibers in said first sheet, said second sheet or both is in the range of
seven to one-hundred microns.
36. The panel as claimed in any one of claims 31 to 35 wherein said first
sheet and said second sheet are of the same resin and glass fibers.
37. The panel as claimed in any one of claims 1 to 36 wherein said second
sheet is formed into said first reinforcement member that is a resilient body.
38. The panel as claimed in any one of claims 1 to 37 wherein said second
sheet is formed into said first reinforcement member that is a compressible body.
39. The panel as claimed in any one of claims 1 to 36 wherein said second
sheet is formed into said first reinforcement member that is a collapsible body.
40. The panel as claimed in any one of claims 1 to 39 that is incorporated into
a ceiling of a building structure.
41. A ceiling system comprising, in combination, a support structure having a
plurality of perpendicular support members defining openings therebetween, said
support members being adapted to support ceiling panels in said openings, and
a ceiling panel in each of said openings as claimed in any one of claims 1 to 40.
42. A method of forming the panel as claimed in any one of claims 1 to 40,
comprising the step of: forming said second sheet into said first reinforcement
member having said plurality of elongated cells.
43. The method as claimed in claim 42 comprising the step of securing said
first reinforcement member to said first sheet, preferably by adhesively bonding,
heat welding or ultrasonically bonding.
A flexible ceiling panel (108) that can be folded or flexed comprises:
- at least one planar sheet (110); and
- at least one sheet of a substantially flat material formed into a first
reinforcement member (114) that is a three-dimensional self-supporting
body having a plurality of elongated cells formed between the planar
sheet and the reinforcement member; and
wherein the planar sheet and the reinforcement member are each of a slightly
rigid but flexible material that comprises heat-resistant fibers bound together by a
resin.

Documents:

in-pct-2002-186-kol-granted-abstract.pdf

in-pct-2002-186-kol-granted-assignment.pdf

in-pct-2002-186-kol-granted-claims.pdf

in-pct-2002-186-kol-granted-correspondence.pdf

in-pct-2002-186-kol-granted-description (complete).pdf

in-pct-2002-186-kol-granted-examination report.pdf

in-pct-2002-186-kol-granted-form 1.pdf

in-pct-2002-186-kol-granted-form 13.pdf

in-pct-2002-186-kol-granted-form 18.pdf

in-pct-2002-186-kol-granted-form 3.pdf

in-pct-2002-186-kol-granted-form 5.pdf

in-pct-2002-186-kol-granted-gpa.pdf

in-pct-2002-186-kol-granted-reply to examination report.pdf

in-pct-2002-186-kol-granted-specification.pdf

in-pct-2002-186-kol-granted-translated copy of priority document.pdf

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Patent Number

225270

Indian Patent Application Number

IN/PCT/2002/186/KOL

PG Journal Number

45/2008

Publication Date

07-Nov-2008

Grant Date

05-Nov-2008

Date of Filing

05-Feb-2002

Name of Patentee

HUNTER DOUGLAS INDUSTRIES B.V.

Applicant Address

2 PIEKSTRAAT, P.O. BOX 5072, 3008, AB ROTTERDAM

Inventors:

#	Inventor's Name	Inventor's Address
1	SWISZCZ PAUL G.	671 BOW MOUNTAIN ROAD BOULDER, CO 80304
2	KUPERUS KO	2890 STEPHENS ROAD BOULDER, CO 80803

PCT International Classification Number

E04B 9/00

PCT International Application Number

PCT/US00/21343

PCT International Filing date

2000-08-04

PCT Conventions:

#	PCT Application Number	Date of Convention	Priority Country
1	60/148,834	1999-08-12	U.S.A.