Title of Invention	MIXING APPARATUS
Abstract	The invention provides mixing apparatus which has a container base (10) and a container lid (12) with the lid carrying mixing means (14) extending through the lid with at one end a mixing element and at the other end a drive connection to a drive motor. When the drive is operated the mixing element mixes the contents of the container, usually when the container is inverted. The lid has a rim portion with a circumferential slot (13) and the top edge of the container (1013) is located into the slot when the lid is assembled with the container whereby to improve connection between the lid and the container during mixing. The lid within the rim portion carries the mixing means and, during mixing, the assembly is held to lock the assembly together.

Title of Invention

MIXING APPARATUS

Abstract

The invention provides mixing apparatus which has a container base (10) and a container lid (12) with the lid carrying mixing means (14) extending through the lid with at one end a mixing element and at the other end a drive connection to a drive motor. When the drive is operated the mixing element mixes the contents of the container, usually when the container is inverted. The lid has a rim portion with a circumferential slot (13) and the top edge of the container (1013) is located into the slot when the lid is assembled with the container whereby to improve connection between the lid and the container during mixing. The lid within the rim portion carries the mixing means and, during mixing, the assembly is held to lock the assembly together.

Full Text	This invention relates to mixing apparatus and, in particular, to mixing apparatus whereby food product can be mixed prior to consumption. It has been proposed to provide mixing apparatus, more particularly blending apparatus, in which a container of product fitted with a lid is blended by blending apparatus within the container. The present invention is intended to provide improved apparatus for mixing food products and which is specially adapted to be cost effective and sufficient for one trip use. According to the invention mere is provided mixing apparatus comprising a container base and a container lid, the container lid having mounted thereon mixing means, the mixing means extending through the lid and having, at one end, means for connection to a drive motor external to the container and, at the other end, a mixing element for mixing the contents of the container when the drive means is operated, the mixing means comprising a shaft portion looatable through an opening in the lid and incorporating the connection means, and a mixing element portion associated with the shaft portion for rotation therewith, the container lid comprising a rim portion defining a circumferential slot into which the top edge of the container is located when the lid and container are assembled. Preferably the container lid rim portion is formed with successive, oppositely-directed circumferential portions, one of the portions lying closely adjacent to the inner side wall of the container when the lid and container are assembled, and defining one side of the slot, and extending into the container. Conveniently the other of said circumferential portions is spaced inwardly of the side wall and has a curvilinear join with said one portion. In one arrangement the circumferential slot is defined by an outer portion arranged to extend around the outer top edge of the container, and an inner portion arranged to extend into the container and the inner portion extends over a greater distance than the outer portion in the axial direction of the container, such distance being between twice and six times said distance. In one arrangement, the mixing element portion incllides an opening through which the shaft portion is located to lock into said opening. The mixing means is assembled on to the lid, the shaft portion being first inserted through one end of the lid opening, and men the mixing element portion is locked onto the shaft portion at the opposite end of the shaft. It is also possible to have one piece mixing means which is assembled with the lid as one piece. Preferably the mixing portion clips onto the shaft portion and is secured thereto by shoulder means on the shaft portion. The mixing and shaft portions may be united by welding them together. The apparatus may comprise a support for an assembled container and lid with the lid located on the support, and a clamping member movable to engage the end of the container opposite the lid and locate the assembly during operation of the mixing means in which the clamping member is reciprocally movable and, upon contacting the container to clamp the assembly, applies a predetermined force to the container in the direction towards the support In one arrangement the clamping member is connected to a fixed member through spring means and, upon the clamping force exceeding a predetermined level, the spring means compresses and a signal is generated to stop movement of the imping member, m such arrangement the clamping member may incllide a clamping surface engageable with the container and extending beyond the side edges of the container and comprising switch means for detecting an obstruction to a clamping action. Conveniently, the container lid is nestable or stackable with other container lids, one being located inside the other. Container lids assembled with the mixing means are also, preferably, arranged to be stackable or nestable. Lubrication, and/or cooling means may be provided to permit the contents of the container, during mixing, to contact and lubricate and/or cool the co-operating surfaces of the shank portion and the opening into the lid. Such lubricating means may incllide longitlidinal slots in the side walls of the opening which constitute a sleeve. A container lid may incllide a product access opening with closure means so that, after completing a mixing operation, the opening is openable to access the contents. The container lid may incllide holding means for holding product arranged to be mixed with the material in the container before, during or after operation of the mixing means. The holding means may incllide a pocket having an opening for introducing the product into the pocket. The pocket may have mesh means for permitting product in the container to enter into the pocket The pocket may be arranged to contain carbonation means for carbonating product in the container. Alternatively or in addition the pocket may contain flavour or other additives for the product Further features of the invention appear from the following description of various embodiments of the invention given by way of example and with reference to the drawings, in which.' Fig. 1 is a vertical cross section through one embodiment of mixing apparatus, Fig. 2 is a vertical section corresponding to that of Fig. 1 of another embodiment Fig. 3 is a vertical section corresponding to those of Figs 1 and 2 of a further embodiment of the invention, Fig. 4 is a perspective view of the underside of a lid for the mixing apparatus, Fig. 5 is cross section on the line 5-5 in Fig. 4, Fig. 5A is an enlarged detail of the cross section of Fig. 5, Fig. 6 is a view corresponding to Fig. 4 showing the blending element disassembled from the lid, Fig. 7 is a view of the lid of Fig. 4 from me opposite side, in perspective, Fig. 8 is a plan view from beneath of a lid and blender element assembly of another embodiment of the invention, Fig. 8A is a section on the line B-B in Fig. 8, Fig. 9 is a view corresponding to Fig. 8 from the opposite side of the assembly, Fig. 9A is a section on the line C-C in Fig. 9, Fig. 10 is a perspective view of the assembly of Figs. 8 - 9 showing the blender element assembled, Fig. 11 is a sectional view of a stack of assemblies of the kind shown in Figs. 8- 10, Fig. 12 is a scope view of part of a lid, Fig. 13 is a similar view to Fig. 12 of an alternative arrangement, Fig. 14 is a scope view, in perspective, of a lid with blending means, Fig. 15 is a vertical section through blending apparatus, and Fig. 16 is a vertical section through other blending apparatus. Referring to the drawings and firstly Figs. 1-3, there is shown three versions of mixing apparatus of which each comprises common elements inclliding a container or container base 10, usually in the form of a paper cup tapering inwardly towards the lower end 10A and having towards the upper end a rolled lip 10B. Instead of the container 10 being formed of paper, it may be of plastics, for example of injection moulded plastics. In use, the container is assembled with a lid 12 with a turned over peripheral edge 13 which is fitted over the lip or rim 10B and carries assembled therewith a blending element 14 arranged for rotation relative to the lid 12. The blending element 14 is rotated by a drive motor 40 having an upwardly directed drive shaft 41 arranged to engage with the blending element 14 for driving engagement during me blending operation. In Figs. 1 - 3, the container 10 and assembled blending element 15 with lid 12 are shown inverted in a position in which product within the container is blended. In this position, the container is inverted with the lid 12 lowermost and the assembly is supported on an annular supporting member 42 which locates under the outer edge of the lid 12. The container 10 is supported and seated in a tapered seating or holder 43 which is tspered to the outer shape of the container 10 and extends towards me upper end of the container so mat the upper edge of the holder 43 engages under the container lip 10B. This arrangement of holder 43, shaped seating 42 and the upper edge of flu lid 12 ensures in each case that the seal between the lid and the container is maintained through all stages of the operation of the blending apparatus, inclliding when the container is inverted, and when the blender is operating prior to blending, the container is located in the holder when upright or inclined towards the user. Usually the holder 43 is initially in an upright or vertically inclined position with its wider end uppermost The container 10 is located in the holder by dropping the assembled container and lid into the holder. The holder is then inverted to the position shown in which the lid is located onto the support 42 with the blending element 14 located over the drive motor 40. A downwards clamping force P is usually applied to the holder 43 to maintain it in its inverted position ready for a blending operation. The motor 40 is operated and the drive shaft 41 engages the blending element 14 through an opening 20 directed outwards from the lid 12. Rotation of the drive 41 causes the blending element 14 to rotate within product located within the container 10. This action blends the product or otherwise mixes it to ensure that it is adequately mixed or blended within the container. When the mixing action has taken place for the required length of time, the clamping force F is released, the drive shaft 41 is disengaged from the blending element 14 and the cup holder with the container therein is removed from the support 42, inverted and released from the holder 43 and the product within the container is ready for consumption. As thus for described it is assumed that the contents of the container to be blended are at the temperature and consistency required but, if necessary, the contents may be heated or cooled prior to the blending operation. In the case of product which needs to be heated, mis may be achieved by directing microwave radiation at product within the container prior to or when in situ on the blending apparatus. It will be seen mat the embodiments of Figs. 1, 2 and 3 differ from each other primarily in the shape of the lid 12. Thus in the case of the Fig. 1 embodiment, the lid 12 is generally planar lying generally at a right-angle to the central axis of the container. The lid 12 is formed with a central circular opening 11 defined by downwardly, axially projecting members 13 flanked by a depression 15. In Fig. 2, the lid 12 is of more complex form, although still having an outer rim 13 and a central opening 11. In Fig. 2, the lid is formed with a part spherical central portion 12A in the middle of which is the opening 11, and the outer edge of the spherioal portion 12A is turned through approximately 180 degrees to form an outer portion 12B in alignment with and closely adjacent the inner walls of the container 10 towards the upper edge thereof. The semi-spherical portion 12A, as shown has a tangential portion 12C and the transition between the portions 12C and 12B is through right-angle bends at 12D. Alternatively, the bends 12D may be replaced by a curvilinear transition. It will be seen that the portion 12D is below the level of the upper end of the container and that the semi-spherical portion 12A projects above the upper edge of the container and the portion 12A may provide a transparent region through which the internal part of the container may be viewed. It will also be noted that the region in which the blending element 14 is operated, when in the inverted position, as shown, is a partial sphere which assists in ensuring an efficient blending operation of product in the container. The edge of the container opening is located between portions 12B and 13 of the lid which together define a circumferential slot, the radially inner side of which extends along the inner wall of the container and in contact therewith. The arrangement of Fig. 3 shows a farther alternative form of lid 12, somewhat similar to the lid 12 of Fig. 2 but in which the part semi-spherical portion 12A is of reduced dimensions so that the upper end of the portion 12A lies substantially level with the upper end of the container 10. The arrangement of Fig. 3 still provides a region in which the blender 14 operates which has curved lower surfaces to assist in ensuring an adequate blending action, and the lid may be of transparent material The embodiments of Figs. 2 and 3 are particularly useful in ensuring a good seating of the lid 12 on the container 10 to reduce the possibility of any leakage or unseating of the lid from the container. One way in which this is achieved is for the portion 12B of the lid 12 to extend along the inner side walls of the upper end of the container giving excellent sealing qualities and a seating within the container. This arrangement also permits a minimal loss of capacity of the container and this can be overcome by allowing the portion 12A of the lid of the container to project beyond the upper end of the container. The use of a cup holder 43 further assists in maintaining a seal between the rim 10B and the lid 12, as shown enlarged in Figs. 1, 2 and 3. Details of the construction of the blender 14 and its associated lid are as described in relation to the later described embodiments. The extent to which the portion 12B extends into the container can be varied in obtaining an adequate seal It is preferred that the axial extent of the portion 12B be between two and twelve times the depth of the outturned edge 13. That is (Fig. 8A) Y-between 2X and 12X Referring now to Figs. 4-7, there is shown a lid 12 and associated blending element 14 of which similar parts are given the same reference numerals as in the preceding embodiment. The blending element 14 is of one piece construction and has a shaft 16 at one end of which is an outwardly projecting lip 19. At the other end of the shaft 16 is located a set of blending blades 17 which extend generally radially outwards from the axis. The shaft 16 is located into a central opening in the lid 12 and around the opening, integral with the lid, are formed arcuate, axially-directed dementi 30 which are circumferentially spaced from one another to leave gaps 31. Along each edge of each element 30 there is formed an angled surface 32 and by provision of the gaps 3 land me angled surfaces 32 mere is provided means for admitting product within the container during blending into the small space between the shaft 16 and the elements 30. By this means the outer surface of the shaft is lubricated and cooled. This may be necessary since the blending element 14 can be rotated at high speed during a blending operation and the shaft 16 is of relatively large diameter to provide structural strength to the element 14. If product being blended is cold and the blending process is short, such lubrication may not be necessary but lubrication is desirable. Since the container is normally inverted during blending, the blending element 14 is immersed in the product and product gains access to the outer surface of the shaft 14. Such product provides a film of lubricant/coolant between the shaft and the element 30. The shaft 16 is located in the opening by applying axially directed preesure while entering the shaft 16 into the opening and when the lip 19 has extended through the opening it locates into a recess at the outer end of the opening to secure the blending element to the lid. The outer end of the element 14 is formed with an internal depression and shape, as at 20, to enable the drive shaft 41 to enter and fully engage in the opening 20 and drive the blending element 14 during a blending operation. The fitting of the shaft 41 in the opening is intended to bring about a strong connection during vigorous blending, which may incllide blending ice cream. In the arrangement of Figs 4 - 7, the outer rim 13 of the lid is formed with slits 34 extending in a generally axial direction from the rim 14 towards the top of lid. Such slits 34 assist in locating the lid on the container, the rim being able to be flexed outwards during such engagement This may be of particular importance when the container is made from paper/cardboard. This arrangement also has application when the lid 1b arranged to be fitted to containers which are of slightly different sizes since the flexibility provided by the slits permits the lid to be fitted to different size containers with different size rims. The slits may have a width of some 1 mm and extend to closely adjacent the inner edge of the rim. Referring now to the lid assembly of Figs. 8-10, the same reference numbers are used for similar parts to these of the previous embodiments and the lid assembly of Figs. 8 - 10 corresponds with that of Fig. 3. It will be seen that the blender element is, in mis case, formed of two portions (see in particular Fig. 10) of which one portion 14A is termed a shaft portion and the other portion 14B is termed a blade portion.The shaft portion 14A is formed with a cylindrical portion 50 which is located within the opening in the lid defined by the elements 30 which together define bearing surfaces for the blending element 14. At one end of the cylindrical portion SO is a flange 51 which locates in the depression 15 formed around the central opening in the lid to thereby secure the blending element at one end thereof. The portion 14A has a further cylindrical part 52 about which is located the bladed portion 14B of the element in use. Intermediate the portions 50 and 52 is provided a portion 54 in which can be seated the bladed portion 14B, when assembled. In practice, the shaft portion 14A is inserted into the opening in the lid, men from the opposite side of the lid is introduced the bladed portion 14B having a central opening 56 into which is inserted the portion 52. The bladed portion 14B is then pushed over the shaft portion 14A to locate the two portions together and the portions are men locked in position by engaging the inner edge of the opening 56 into a groove on the portion 54 or a shoulder is provided on the portion 52 over which the bladed portion 42 is located to prevent release. With this arrangement, the two portions 14A and 14B are locked together as one, after fitting to the lid 12 and are rotatable relative to the lid within the opening to enable the blending action to be performed. The outer side of the blending element 14 lies flush with the upper surface of the lid to provide a neat appearance and, once assembled, the lids and blending elements sre nestable together for transportation purposes, as seen in Fig. 11. To assist in such nesting together, there is provided lugs 56 against which the portions 12D of the lid are arranged to engage. In order to provide tor easy access to product to be consumed from the container 10, the lid is provided with an opening 58 displaced to one side of the central axis and having to the upper open side a closure member 60 which locates into the aperture 58 and is hinged at 62 to enable the closure 60 to be opened and closed acoording to the requirements of the user. Referring now to Fig. 11, there is shown a series of lids of the kind illustrated in Figs. 8-9 which have been nested together after manufacture and assembly of the blending elements with the lids. The same reference numerals are used in relation to the same parts. It will be seen that the portions 12D locate in the gap between the portions 12C and 12B on an adjacent lid but me portion 12D engages up against lugs 56 whereby the lids may be readily denested from one another. However it is not essential mat the lids be nestable. The shaft portions 52 of the blending elements locate within the opening at the drive shaft end of the blending element when nested together. Flat portions of the blades 17 of the blending element 14 rest against the upper surface of the lids at 12B to assist in enabling the lids to be nested and denested. This nesting facility permits the assembled lids and blending elements to be transported occupying limited volume to a location where the lids are to be assembled on to the container bases. Referring now to Fig. 12, mere is shown a detailed view of part of a lid similar to mat of Figs. 8 - 9 in which there is formed in the upper side of the lid in the region 12B a pocket 60 depending downwardly into the container and having opening 62 in the side walls giving access into the pocket from within the container. Towards the outer side of the pocket 60 is formed an opening 64 giving access into the pocket for a holder 66 which is shaped to be a close fit within the pocket 60, sealing the openings 62 and preventing product from passing out of the pocket 60 to the outside of the container. The holder 66 may contain any additive which is required to make to the product during mixing but, in particular, additives which when contacted by the products within the container will react with me product to create a desired effect In one arrangement the holder 66 contains material which when contacted by the product will carbonate the contents of me container. Such carbonation will commence when product in the container reaches the opening 62 and enters the holder 66. Reaction between the contents and the carbonation material will set up a carbonation action and tins will take place when the container is inverted and the contents blended. Referring now to Fig. 13 an arrangement for a similar purpose to that of Fig. 12 is provided and the same references are used for similar parts. The arrangement of Fig. 13 primarily differs in that rather than the holder 66 sealing the opening 64, the equivalent holder 67 of earbonating product is located in a pocket 60 which is provided with a closure member 68 which seals the opening 64 at the upper end of the pocket 60. The closure 68 is pivoted towards the side edge 13 of the lid to be moved about me pivot between an open condition, as shown, and a olosed condition in which the closure 68 has been pivoted into position over the opening 64. The holder 67 of this embodiment may be in the form of a liquid permeable bag and arranged so that upon contact by the contents of the container, the carbonation material is activated to release carbon dioxide into the body of the product During use of the container and lid assembly various means can be employed to ensure good fitting together of the units to avoid leakage and ensure integrity of the assembly. The fitting of the lid onto the container, as described, is intended to ensure this. Moreover rather than having to rely on the operator, the assembly can, at the filling location, or, if filling takes place at the dispensing location, be provided with a clamping mechanism whereby after the fitting the lid to the container a pressure plate or other clamp is applied between the ends of the container and lid until a predetermined pressure has been reached and this pressure is released. The assembly can then be inverted and the product is ready to be blended. After fitting the lid to the container the perts may be united by heat sealing or otherwise. Referring now to Fig. 14 in which the same reference nombers are given to similar parts of the previoua embodiments, an alternative form of lid 12 and associated blending meana is shown. The lid 12 is similar to that shown in Figs. 3, 8 and 9 having an outer rim 13 which fits over the outer edge of a containar end and an inner portion 12B which extends into the container in contact with or closely adjacent to the inner wall of the containg towards its outer edge, the portion 13 and portion 12B defining between them a circumferential slot into which the open edge of the container is located. Aa previously described the container lid has an outwardly convex portion 12A, 12B, which merges with the portion 12B through a turned over portion 12D. Centrally of the outwardly convex portion 12A, 12B there is provided an opening O into which is to be located a two part blending means 14. The shaft part 14A of the blending means 14 has at one end connection means for connecting the blending means to the motor drive 41 and has a abaft 16 which over its outer surface 50 locates in an opening 56 in the blending element part 14B. Assembly of the blending means with the lid 12 is by locating shaft part 14A through the opening O and through the opening 56 in the part 14B. The surface SO may be formed with a shoulder to locate with the outer end of the opening 56, or the parts 14A and 14B may be welded together after assembly. The surface 50 locates with the surfaces of the opening O to define a bearing surface which is of relatively small diameter to reduce the potential for the bearing surfaces to overheat Also formed in the portion 12B of the lid 12 is an opening 58 which is provided ss an access opening for accessing the contents of the container after blending, for example through a straw. To be located over the opening 58 during blending is a removable closure or label 58A which is adhesively applied to the lid and is peelable therefrom when required. Referring now to Fig. 15 there is shown an alternative arrangement for supporting an assembly of container 10 and lid 12 daring a blending operation. The assembled container 10 and lid 12 are located inverted on a support 42 of a housing for the drive motor, as previously described. Located above the assembly in the blending position is a clamping arrangement 75 inclliding a reciprocal container engagement member 77 carried an the lower end of an actuator 78 which is in turn driven by an actuator motor 80 to move up and down towards and away from the container. The clamping assembly is mounted on a rigid mounting bracket 82 for movement relative thereto through a compression spring 84, the assembly being movably supported by a support bolt 86. Movement of the assembly towards me bracket 82 is against the resistance of the compression spring 84 and mere is also provided a switch 88 which detects movement of the actuator relative to the bracket 82 against the action of the spring 84. The clamping member 77 is arranged to engage the narrow end of the container 10 to clamp it into position during blending and as the central portion 77A which ia shaped to match the cross-section of the container to be engaged. Bxtending around the central area 77A is a safety ring 88 in the form of an annular ring movable rotative to the member 77 against spring means 77B. Movement of the ring 88 against the spring means is detected by a switch 79 which, when actuated, stops movement of the actuator 78 and actuator motor 80. This arrangement ensures mat obstructions between the member 77 and the container, such as an operator's fingers, are detected to stop operation of the clamping arrangement In operation of the clamping assembly of Fig. 15 after an assembly of container and lid hss been placed on the support 42, the actuator motor is actuated to cause the clamping member 77 to move downwards into engagement with the end of the container. A predetermined pressure is applied to the end of the container to bring about a clamping action between the support 42 and the clamping member 77 and between the lid 12 and the container 10. This ensures that the assembly of container and lid is adequately made and support is sufficient during the blending operation. Due to the way in which the clamping arrangement is supported at its upper end there is detected a predetermined pressure on the container through movement relative to the bracket 22 which is detected by the switch 88 which is irrespective of the size of the container so the container can have an axial dimension at positions P1 or P2 or at any positions in between. Whatever the size of the container, as soon as the predetermined clamping pressure has been reached the clamping operation is complete and there is no further movement of the clamping member. It will be appreciated that the blending apparatus can be programmed to operate according to the size of container used and the contents of the container which may require different blending times. As described blending apparatus detects the size of container which may also determine the blending duration. However, in addition, the operator can set the blending duration through the operator controls. Referring now to Fig. 16 there is shown blending apparatus in which the same reference numbers are, again, given to parts similar to those of previous embodiments. The apparatus shown in Fig. 16 incllides a container 10 and a combined lid 12 and blending means 14 which are of similar form to those shown in Fig. 3 and others of the drawings. The assembled containers and lid are inverted for a blending operation to the position shown and such inversion can be done manually or by locating the containers 10 in a holder 43 shaped to the external shape of me container 10. The holder 43 may be rotatable about axis A-A from an upright position in which the container is located into the holder, to an inverted position in which the blending means 14 it placed in driving engagement with the drive motor 40 for a blending operation. The container 10 is generally made of stiff coated paper or card which is formed with an overlapped portion running in the lengthwise direction of the container. This construction can result in potential problems with leakage between the lid and the inside wall of the container where the overlap occurs. In order to mitigate any potential leakage there is provided a clamping arrangement whereby the outer surface of the container adjacent the lid has applied to it inwardly directed clamping forces to assist in sealing the inner surface of the container against the inwardly directed portion of the lid which locates against said inner surface. In the illustrated arrangement clamping is by providing an air chamber 90 extending around the outside of the container 10 towards its wide end and having a radially inner flexible wall 92 which is arranged to contact the outer wall of the container so that when the chamber 90 has compressed gas admitted the wall 92 is caused to extend radially inwards against the container wall. It compresses against the wall to seal the wall against the lid and thereby seal against any leaks. To assist in the sealing action, there may be inserted into lid over the outwardly directed circumferential opening extending around the lid portion 12C, a circular abutment member 94. Thus, as the wall 92 filled with compressed gas to expand inwardly against the container wall, abutment member 94 acts as an abutment to resist such movement and act to assist as a seal. Compressed gas to the chamber 90 is supplied by a suitable compressor through an inlet tube 96 and the tube 96 and chamber 90 are incorporated into the holder 43 which holder is directed downwardly to hold the assembly onto me base 42 during blending, as shown by the arrows F. The chamber 90 is inflated or charged wim gas at the commencement of the container inversion action and, upon completion of the blending, me tube is deflated so that the container with its blending contents can be removed from the holder 43. Air to the chamber 90 may be ducted through tube 98 from an inlet 99 tying along the axis A so that the air can be ducted before and during blending and whilst the holder is rotated. Instead of using the inflated ring arrangement shown in Fig. 16, a mechanical clamping arrangement can be used whereby a metal ring (not ahown) in me position of chamber 90 extendi around me container and is moved radially in and out to clamp the container. Usually clamping around the container will be needed before the container is inverted, during blending, and until the container is upright again. WE CLAIM: 1. Mixing apparatus comprising a container base and a container lid, the container lid having mounted thereon a rotatable mixing element for mixing contents of the container when drive means external to the container is operated, the container lid comprising a rim portion defining a circumferential slot into which the top edge of the container is located when the lid and container are assembled, wherein an outwardly convex portion is formed on the lid within the rim portion, the convex portion inclliding the opening into which the mixing means is located. 2. Mixing apparatus according to claims 1 wherein the outwardly convex portion lies substantially level with the upper end of the container, when the lid is located on the open end of the container. 3. Mixing apparatus according to claim 1 wherein container lids are arranged to be nestable or stackable with other container lids, when not assembled with the container bases, one container lid being located inside another. 4. Mixing apparatus according to claim 1 wherein the slot is defined by an outer portion arranged to extend around the top edge of the container, and an inner portion arranged to extend into the container in contact with or closely adjacent the inner wall of the container. 5. Mixing apparatus according to claim 4 wherein a curvilinear join is provided between the inner and outer portions of the slot. 6. Mixing apparatus according to claim 4 wherein the inner portion extends between two and twelve times the distance of the outer portion. 7. Mixing apparatus according to claim 1 comprising a support for an assembled container and lid, and a clamping member movable to engage the end of the container opposite the lid and locate the assembly during operation of the mixing element, and wherein the clamping member incllides a clamping surface engageable with the container and extending beyond the side edges of the container and comprising a switch for detecting an obstruction to a clamping action. 8. Mixing apparatus according to claim 7 wherein the clamping member is reciprocally movable and, upon contacting the container to clamp the assembly, applies a predetermined force to the container in the direction towards the support. 9. Mixing apparatus according to claim 8 wherein the clamping member is connected to a fixed member through spring means and, upon the clamping force exceeding a predetermined level, the spring means compresses and a signal is generated to stop movement of the clamping member. 10. Mixing apparatus according to claim 1 wherein the mixing element is assembled onto the lid by first inserting a shaft portion through an opening in the lid, and locking the mixing element onto the shaft portion. 11. Mixing apparatus according to claim 10 wherein the mixing element clips onto the shaft portion and is secured thereto by a shoulder on the shaft portion and/or by welding. 12. Mixing apparatus according to claim 10 comprising lubrication means to permit the contents of the container, during mixing, to contact and lubricate the co-operating surfaces of the shaft portion and the opening in the lid. and wherein the lubrication means incllides longitlidinal slots in the side walls of constitute a sleeve for said shaft portion,the slots admitting the container contents to act as lubrication. 13. Mixing apparatus according to claim 1 wherein the container lid incllides a product access opening with closure means, the access opening being for accessing the contents of the container after mixing. 14. Mixing apparatus according to claim 1 wherein the container lid incllides means for holding product arranged to be mixed with material in the container before, during or after operation of the mixing means. 15. A container lid for mounting on an open ended beverage container, the container lid having located thereon a rotatable mixing element for mixing the contents of the container when drive means external to the container is operated, the container lid comprising a rim portion for fitting of the lid onto the open end of the container, wherein the lid incllides an outwardly convex portion formed within the rim portion, the convex portion inclliding the opening through which the mixing element extends. 16. A container lid according to claim 15 wherein the outwardly convex portion is of a curvilinear dome shape and the mixing means is located centrally thereof. 17. A container lid according to claim 15 wherein the outwardly convex portion is semi-spherical or part semi-spherical. 18. A container lid according to claim 15 wherein the outwardly convex portion is transparent. 19. A container lid according to claim 15 wherein the lid defines an internal region in which the mixing means operates, said region having curved surfaces. 20. A container lid according to claim 15 wherein the lid incllides a product access opening with closure means, the access opening being for accessing the contents of the container after mixing. 21. A container lid according to claim 15 wherein the outwardly convex portion is level with the rim portion. 22. A container lid according to claim 15 wherein the outwardly convex portion projects above the rim portion. 23. A container lid for mounting on an open ended beverage container, the container lid having located thereon a rotatable mixing element for mixing the contents of the container when drive means external to the container is operated, wherein the lid defines an internal region in which the mixing element operates, said region having curved surfaces and the mixing element being located centrally thereof. 24. A container lid according to claim 23 wherein the internal region is of carvilinear dome shape. 25. A container lid according to claim 23 wherein the lid incllides a product access opening with closure means, the access opening being for accessing the contents of the container after mixing. 26. A container lid for mounting on an open ended beverage container, the container lid having located thereon a rotatable mixing element for mixing the contents of the container when drive means external to the container is operated, wherein the lid comprises a rim portion defining a circumferential slot into which the top edge of the container is located when the lid and container are assembled. 27. A container lid according to claim 26 wherein the slot is defined by oppositely- directed circumferential portions, a first of said portions lying in contact with or closely adjacent the inner side wall of the container and extending into the container when the lid and container are assembled together, and wherein the other of said circumferential portions is spaced inwardly of the side wall and has a curvilinear join will said first portion. 28. A container lid according to claim 27 wherein the inner portion extends between two and twelve times the distance of the outer portion. 29. Mixing apparatus comprising a container base and a container lid, the container lid having mounted thereon a rotatable mixing element for mixing the contents of the container when drive means external to the container is operated, wherein the apparatus further comprises a support for an assembled container and lid with the lid located on the support, and a clamping member movable to engage the end of the container opposite the lid and locate the assembly during operation of the mixing element, said clamping member inclliding a clamping surface engageable with the container and extending beyond the side edges of the container and comprising switch means for delecting an obstruction to a clamping action. 30. A container lid for mounting on an open ended beverage container, the container lid having located thereon a rotatable mixing element inclliding a shaft portion extending through the lid and having, at one end, means for connection to a drive motor external to the container and, at the other end, a blender element for mixing the contents of the container when the drive means is operated, wherein the blender element is arranged to be assembled with the shaft portion after the shaft portion is located in said opening. 31. A container lid according to claim 30 wherein the blender element incllides an opening through which the shaft portion is located to lock into said opening. 32. A container lid according to claim 30 wherein the blender element clips onto the shaft portion and is secured thereto by shoulder means on the shaft portion and/or by welding. 33. A container lid according to claim 30 comprising lubrication means to permit the contents of the container, during mixing, to contact and lubricate co-operating surfaces of the shaft portion and the opening in the lid, and wherein the lubrication means incllides longitlidinal slots in the side walls of the opening which constitute a sleeve for said shaft portion, the slots admitting the container contents to act as lubrication. 34. A container lid for mounting on an open ended beverage container, the container lid having located thereon a rotatable mixing element for mixing the contents of the container when drive means external to the container is operated, wherein the rotatable mixing element incllides blades having flat portions configured to rest against or adjacent the upper surface of a lid of the same kind and configuration, when stacked one on top of another. 3:5. A container lid for mounting on an open ended beverage container, the container lid having located thereon a rotatable mixing element for mixing the contents of the container when drive means external to the container is operated, wherein the lid incllides an upper portion having an annular gap, and an annular lower portion which is intended to locate in the annular gap of a lid of the same kind and configuration, when stacked one on top of another. 36. A container lid for mounting on an open ended beverage container, the container lid having located thereon a rotatable mixing element for mixing the contents of the container when drive means external to the container is operated, the container lid comprising a rim portion defining a circumferential slot into which the top edge of the container is located when the lid and container are assembled, wherein the slot is defined by an outer portion arranged to extend around the top edge of the container, and an inner portion arranged to extend into the container in contact with or closely adjacent the inner wall of the container. 37. A container lid according to claim 36 wherein a curvilinear join is provided between the inner and outer portions of the slot. 38. A container lid according to claim 36 wherein the inner portion extends between two and twelve times the distance of the outer portion. The invention provides mixing apparatus which has a container base (10) and a container lid (12) with the lid carrying mixing means (14) extending through the lid with at one end a mixing element and at the other end a drive connection to a drive motor. When the drive is operated the mixing element mixes the contents of the container, usually when the container is inverted. The lid has a rim portion with a circumferential slot (13) and the top edge of the container (1013) is located into the slot when the lid is assembled with the container whereby to improve connection between the lid and the container during mixing. The lid within the rim portion carries the mixing means and, during mixing, the assembly is held to lock the assembly together.

Full Text

This invention relates to mixing apparatus and, in particular, to mixing apparatus
whereby food product can be mixed prior to consumption.
It has been proposed to provide mixing apparatus, more particularly blending apparatus,
in which a container of product fitted with a lid is blended by blending apparatus within
the container.
The present invention is intended to provide improved apparatus for mixing food
products and which is specially adapted to be cost effective and sufficient for one trip
use.
According to the invention mere is provided mixing apparatus comprising a container
base and a container lid, the container lid having mounted thereon mixing means, the
mixing means extending through the lid and having, at one end, means for connection
to a drive motor external to the container and, at the other end, a mixing element for
mixing the contents of the container when the drive means is operated, the mixing
means comprising a shaft portion looatable through an opening in the lid and
incorporating the connection means, and a mixing element portion associated with the
shaft portion for rotation therewith, the container lid comprising a rim portion defining
a circumferential slot into which the top edge of the container is located when the lid
and container are assembled.
Preferably the container lid rim portion is formed with successive, oppositely-directed
circumferential portions, one of the portions lying closely adjacent to the inner side
wall of the container when the lid and container are assembled, and defining one side of
the slot, and extending into the container.
Conveniently the other of said circumferential portions is spaced inwardly of the side
wall and has a curvilinear join with said one portion.
In one arrangement the circumferential slot is defined by an outer portion arranged to
extend around the outer top edge of the container, and an inner portion arranged to
extend into the container and the inner portion extends over a greater distance than the
outer portion in the axial direction of the container, such distance being between twice
and six times said distance.
In one arrangement, the mixing element portion incllides an opening through which the
shaft portion is located to lock into said opening.
The mixing means is assembled on to the lid, the shaft portion being first inserted
through one end of the lid opening, and men the mixing element portion is locked onto
the shaft portion at the opposite end of the shaft.
It is also possible to have one piece mixing means which is assembled with the lid as
one piece.
Preferably the mixing portion clips onto the shaft portion and is secured thereto by
shoulder means on the shaft portion. The mixing and shaft portions may be united by
welding them together.
The apparatus may comprise a support for an assembled container and lid with the lid
located on the support, and a clamping member movable to engage the end of the
container opposite the lid and locate the assembly during operation of the mixing means
in which the clamping member is reciprocally movable and, upon contacting the
container to clamp the assembly, applies a predetermined force to the container in the
direction towards the support
In one arrangement the clamping member is connected to a fixed member through
spring means and, upon the clamping force exceeding a predetermined level, the spring
means compresses and a signal is generated to stop movement of the imping member,
m such arrangement the clamping member may incllide a clamping surface engageable
with the container and extending beyond the side edges of the container and comprising
switch means for detecting an obstruction to a clamping action.
Conveniently, the container lid is nestable or stackable with other container lids, one
being located inside the other.
Container lids assembled with the mixing means are also, preferably, arranged to be
stackable or nestable.
Lubrication, and/or cooling means may be provided to permit the contents of the
container, during mixing, to contact and lubricate and/or cool the co-operating surfaces
of the shank portion and the opening into the lid. Such lubricating means may incllide
longitlidinal slots in the side walls of the opening which constitute a sleeve.
A container lid may incllide a product access opening with closure means so that, after
completing a mixing operation, the opening is openable to access the contents.
The container lid may incllide holding means for holding product arranged to be mixed
with the material in the container before, during or after operation of the mixing means.
The holding means may incllide a pocket having an opening for introducing the product
into the pocket.
The pocket may have mesh means for permitting product in the container to enter into
the pocket
The pocket may be arranged to contain carbonation means for carbonating product in
the container. Alternatively or in addition the pocket may contain flavour or other
additives for the product
Further features of the invention appear from the following description of various
embodiments of the invention given by way of example and with reference to the
drawings, in which.'
Fig. 1 is a vertical cross section through one embodiment of mixing apparatus,
Fig. 2 is a vertical section corresponding to that of Fig. 1 of another embodiment
Fig. 3 is a vertical section corresponding to those of Figs 1 and 2 of a further
embodiment of the invention,
Fig. 4 is a perspective view of the underside of a lid for the mixing apparatus,
Fig. 5 is cross section on the line 5-5 in Fig. 4,
Fig. 5A is an enlarged detail of the cross section of Fig. 5,
Fig. 6 is a view corresponding to Fig. 4 showing the blending element
disassembled from the lid,
Fig. 7 is a view of the lid of Fig. 4 from me opposite side, in perspective,
Fig. 8 is a plan view from beneath of a lid and blender element assembly of another
embodiment of the invention,
Fig. 8A is a section on the line B-B in Fig. 8,
Fig. 9 is a view corresponding to Fig. 8 from the opposite side of the assembly,
Fig. 9A is a section on the line C-C in Fig. 9,
Fig. 10 is a perspective view of the assembly of Figs. 8 - 9 showing the blender
element assembled,
Fig. 11 is a sectional view of a stack of assemblies of the kind shown in Figs. 8-
10,
Fig. 12 is a scope view of part of a lid,
Fig. 13 is a similar view to Fig. 12 of an alternative arrangement,
Fig. 14 is a scope view, in perspective, of a lid with blending means,
Fig. 15 is a vertical section through blending apparatus, and
Fig. 16 is a vertical section through other blending apparatus.
Referring to the drawings and firstly Figs. 1-3, there is shown three versions of
mixing apparatus of which each comprises common elements inclliding a container or
container base 10, usually in the form of a paper cup tapering inwardly towards the
lower end 10A and having towards the upper end a rolled lip 10B. Instead of the
container 10 being formed of paper, it may be of plastics, for example of injection
moulded plastics.
In use, the container is assembled with a lid 12 with a turned over peripheral edge 13
which is fitted over the lip or rim 10B and carries assembled therewith a blending
element 14 arranged for rotation relative to the lid 12.
The blending element 14 is rotated by a drive motor 40 having an upwardly directed
drive shaft 41 arranged to engage with the blending element 14 for driving engagement
during me blending operation.
In Figs. 1 - 3, the container 10 and assembled blending element 15 with lid 12 are
shown inverted in a position in which product within the container is blended. In this
position, the container is inverted with the lid 12 lowermost and the assembly is
supported on an annular supporting member 42 which locates under the outer edge of
the lid 12.
The container 10 is supported and seated in a tapered seating or holder 43 which is
tspered to the outer shape of the container 10 and extends towards me upper end of the
container so mat the upper edge of the holder 43 engages under the container lip 10B.
This arrangement of holder 43, shaped seating 42 and the upper edge of flu lid 12
ensures in each case that the seal between the lid and the container is maintained
through all stages of the operation of the blending apparatus, inclliding when the
container is inverted, and when the blender is operating prior to blending, the container
is located in the holder when upright or inclined towards the user.
Usually the holder 43 is initially in an upright or vertically inclined position with its
wider end uppermost The container 10 is located in the holder by dropping the
assembled container and lid into the holder. The holder is then inverted to the position
shown in which the lid is located onto the support 42 with the blending element 14
located over the drive motor 40. A downwards clamping force P is usually applied to
the holder 43 to maintain it in its inverted position ready for a blending operation. The
motor 40 is operated and the drive shaft 41 engages the blending element 14 through an
opening 20 directed outwards from the lid 12. Rotation of the drive 41 causes the
blending element 14 to rotate within product located within the container 10. This
action blends the product or otherwise mixes it to ensure that it is adequately mixed or
blended within the container.
When the mixing action has taken place for the required length of time, the clamping
force F is released, the drive shaft 41 is disengaged from the blending element 14 and
the cup holder with the container therein is removed from the support 42, inverted and
released from the holder 43 and the product within the container is ready for
consumption. As thus for described it is assumed that the contents of the container to
be blended are at the temperature and consistency required but, if necessary, the
contents may be heated or cooled prior to the blending operation. In the case of product
which needs to be heated, mis may be achieved by directing microwave radiation at
product within the container prior to or when in situ on the blending apparatus.
It will be seen mat the embodiments of Figs. 1, 2 and 3 differ from each other
primarily in the shape of the lid 12. Thus in the case of the Fig. 1 embodiment, the lid
12 is generally planar lying generally at a right-angle to the central axis of the
container. The lid 12 is formed with a central circular opening 11 defined by
downwardly, axially projecting members 13 flanked by a depression 15.
In Fig. 2, the lid 12 is of more complex form, although still having an outer rim 13 and
a central opening 11. In Fig. 2, the lid is formed with a part spherical central portion
12A in the middle of which is the opening 11, and the outer edge of the spherioal
portion 12A is turned through approximately 180 degrees to form an outer portion 12B
in alignment with and closely adjacent the inner walls of the container 10 towards the
upper edge thereof. The semi-spherical portion 12A, as shown has a tangential portion
12C and the transition between the portions 12C and 12B is through right-angle bends
at 12D. Alternatively, the bends 12D may be replaced by a curvilinear transition.
It will be seen that the portion 12D is below the level of the upper end of the container
and that the semi-spherical portion 12A projects above the upper edge of the container
and the portion 12A may provide a transparent region through which the internal part of
the container may be viewed. It will also be noted that the region in which the blending
element 14 is operated, when in the inverted position, as shown, is a partial sphere
which assists in ensuring an efficient blending operation of product in the container.
The edge of the container opening is located between portions 12B and 13 of the lid
which together define a circumferential slot, the radially inner side of which extends
along the inner wall of the container and in contact therewith.
The arrangement of Fig. 3 shows a farther alternative form of lid 12, somewhat similar
to the lid 12 of Fig. 2 but in which the part semi-spherical portion 12A is of reduced
dimensions so that the upper end of the portion 12A lies substantially level with the
upper end of the container 10.
The arrangement of Fig. 3 still provides a region in which the blender 14 operates
which has curved lower surfaces to assist in ensuring an adequate blending action, and
the lid may be of transparent material
The embodiments of Figs. 2 and 3 are particularly useful in ensuring a good seating of
the lid 12 on the container 10 to reduce the possibility of any leakage or unseating of
the lid from the container. One way in which this is achieved is for the portion 12B of
the lid 12 to extend along the inner side walls of the upper end of the container giving
excellent sealing qualities and a seating within the container. This arrangement also
permits a minimal loss of capacity of the container and this can be overcome by
allowing the portion 12A of the lid of the container to project beyond the upper end of
the container. The use of a cup holder 43 further assists in maintaining a seal between
the rim 10B and the lid 12, as shown enlarged in Figs. 1, 2 and 3. Details of the
construction of the blender 14 and its associated lid are as described in relation to the
later described embodiments. The extent to which the portion 12B extends into the
container can be varied in obtaining an adequate seal It is preferred that the axial
extent of the portion 12B be between two and twelve times the depth of the outturned
edge 13. That is (Fig. 8A) Y-between 2X and 12X
Referring now to Figs. 4-7, there is shown a lid 12 and associated blending element
14 of which similar parts are given the same reference numerals as in the preceding
embodiment. The blending element 14 is of one piece construction and has a shaft 16
at one end of which is an outwardly projecting lip 19. At the other end of the shaft 16
is located a set of blending blades 17 which extend generally radially outwards from the
axis.
The shaft 16 is located into a central opening in the lid 12 and around the opening,
integral with the lid, are formed arcuate, axially-directed dementi 30 which are
circumferentially spaced from one another to leave gaps 31. Along each edge of each
element 30 there is formed an angled surface 32 and by provision of the gaps 3 land me
angled surfaces 32 mere is provided means for admitting product within the container
during blending into the small space between the shaft 16 and the elements 30. By this
means the outer surface of the shaft is lubricated and cooled. This may be necessary
since the blending element 14 can be rotated at high speed during a blending operation
and the shaft 16 is of relatively large diameter to provide structural strength to the
element 14. If product being blended is cold and the blending process is short, such
lubrication may not be necessary but lubrication is desirable. Since the container is
normally inverted during blending, the blending element 14 is immersed in the product
and product gains access to the outer surface of the shaft 14. Such product provides a
film of lubricant/coolant between the shaft and the element 30.
The shaft 16 is located in the opening by applying axially directed preesure while
entering the shaft 16 into the opening and when the lip 19 has extended through the
opening it locates into a recess at the outer end of the opening to secure the blending
element to the lid. The outer end of the element 14 is formed with an internal
depression and shape, as at 20, to enable the drive shaft 41 to enter and fully engage in
the opening 20 and drive the blending element 14 during a blending operation. The
fitting of the shaft 41 in the opening is intended to bring about a strong connection
during vigorous blending, which may incllide blending ice cream.
In the arrangement of Figs 4 - 7, the outer rim 13 of the lid is formed with slits 34
extending in a generally axial direction from the rim 14 towards the top of lid. Such
slits 34 assist in locating the lid on the container, the rim being able to be flexed
outwards during such engagement This may be of particular importance when the
container is made from paper/cardboard. This arrangement also has application when
the lid 1b arranged to be fitted to containers which are of slightly different sizes since
the flexibility provided by the slits permits the lid to be fitted to different size
containers with different size rims. The slits may have a width of some 1 mm and
extend to closely adjacent the inner edge of the rim.
Referring now to the lid assembly of Figs. 8-10, the same reference numbers are used
for similar parts to these of the previous embodiments and the lid assembly of Figs. 8 -
10 corresponds with that of Fig. 3. It will be seen that the blender element is, in mis
case, formed of two portions (see in particular Fig. 10) of which one portion 14A is
termed a shaft portion and the other portion 14B is termed a blade portion.The shaft
portion 14A is formed with a cylindrical portion 50 which is located within the opening
in the lid defined by the elements 30 which together define bearing surfaces for the
blending element 14. At one end of the cylindrical portion SO is a flange 51 which
locates in the depression 15 formed around the central opening in the lid to thereby
secure the blending element at one end thereof.
The portion 14A has a further cylindrical part 52 about which is located the bladed
portion 14B of the element in use. Intermediate the portions 50 and 52 is provided a
portion 54 in which can be seated the bladed portion 14B, when assembled.
In practice, the shaft portion 14A is inserted into the opening in the lid, men from the
opposite side of the lid is introduced the bladed portion 14B having a central opening
56 into which is inserted the portion 52. The bladed portion 14B is then pushed over
the shaft portion 14A to locate the two portions together and the portions are men
locked in position by engaging the inner edge of the opening 56 into a groove on the
portion 54 or a shoulder is provided on the portion 52 over which the bladed portion 42
is located to prevent release.
With this arrangement, the two portions 14A and 14B are locked together as one, after
fitting to the lid 12 and are rotatable relative to the lid within the opening to enable the
blending action to be performed.
The outer side of the blending element 14 lies flush with the upper surface of the lid to
provide a neat appearance and, once assembled, the lids and blending elements sre
nestable together for transportation purposes, as seen in Fig. 11. To assist in such
nesting together, there is provided lugs 56 against which the portions 12D of the lid are
arranged to engage.
In order to provide tor easy access to product to be consumed from the container 10, the
lid is provided with an opening 58 displaced to one side of the central axis and having
to the upper open side a closure member 60 which locates into the aperture 58 and is
hinged at 62 to enable the closure 60 to be opened and closed acoording to the
requirements of the user.
Referring now to Fig. 11, there is shown a series of lids of the kind illustrated in Figs.
8-9 which have been nested together after manufacture and assembly of the blending
elements with the lids. The same reference numerals are used in relation to the same
parts. It will be seen that the portions 12D locate in the gap between the portions 12C
and 12B on an adjacent lid but me portion 12D engages up against lugs 56 whereby the
lids may be readily denested from one another. However it is not essential mat the lids
be nestable.
The shaft portions 52 of the blending elements locate within the opening at the drive
shaft end of the blending element when nested together. Flat portions of the blades 17
of the blending element 14 rest against the upper surface of the lids at 12B to assist in
enabling the lids to be nested and denested.
This nesting facility permits the assembled lids and blending elements to be transported
occupying limited volume to a location where the lids are to be assembled on to the
container bases.
Referring now to Fig. 12, mere is shown a detailed view of part of a lid similar to mat
of Figs. 8 - 9 in which there is formed in the upper side of the lid in the region 12B a
pocket 60 depending downwardly into the container and having opening 62 in the side
walls giving access into the pocket from within the container. Towards the outer side
of the pocket 60 is formed an opening 64 giving access into the pocket for a holder 66
which is shaped to be a close fit within the pocket 60, sealing the openings 62 and
preventing product from passing out of the pocket 60 to the outside of the container.
The holder 66 may contain any additive which is required to make to the product during
mixing but, in particular, additives which when contacted by the products within the
container will react with me product to create a desired effect In one arrangement the
holder 66 contains material which when contacted by the product will carbonate the
contents of me container. Such carbonation will commence when product in the
container reaches the opening 62 and enters the holder 66. Reaction between the
contents and the carbonation material will set up a carbonation action and tins will take
place when the container is inverted and the contents blended.
Referring now to Fig. 13 an arrangement for a similar purpose to that of Fig. 12 is
provided and the same references are used for similar parts. The arrangement of Fig.
13 primarily differs in that rather than the holder 66 sealing the opening 64, the
equivalent holder 67 of earbonating product is located in a pocket 60 which is provided
with a closure member 68 which seals the opening 64 at the upper end of the pocket 60.
The closure 68 is pivoted towards the side edge 13 of the lid to be moved about me
pivot between an open condition, as shown, and a olosed condition in which the closure
68 has been pivoted into position over the opening 64.
The holder 67 of this embodiment may be in the form of a liquid permeable bag and
arranged so that upon contact by the contents of the container, the carbonation material
is activated to release carbon dioxide into the body of the product
During use of the container and lid assembly various means can be employed to ensure
good fitting together of the units to avoid leakage and ensure integrity of the assembly.
The fitting of the lid onto the container, as described, is intended to ensure this.
Moreover rather than having to rely on the operator, the assembly can, at the filling
location, or, if filling takes place at the dispensing location, be provided with a
clamping mechanism whereby after the fitting the lid to the container a pressure plate or
other clamp is applied between the ends of the container and lid until a predetermined
pressure has been reached and this pressure is released. The assembly can then be
inverted and the product is ready to be blended.
After fitting the lid to the container the perts may be united by heat sealing or
otherwise.
Referring now to Fig. 14 in which the same reference nombers are given to similar parts
of the previoua embodiments, an alternative form of lid 12 and associated blending
meana is shown. The lid 12 is similar to that shown in Figs. 3, 8 and 9 having an outer
rim 13 which fits over the outer edge of a containar end and an inner portion 12B which
extends into the container in contact with or closely adjacent to the inner wall of the
containg towards its outer edge, the portion 13 and portion 12B defining between them
a circumferential slot into which the open edge of the container is located.
Aa previously described the container lid has an outwardly convex portion 12A, 12B,
which merges with the portion 12B through a turned over portion 12D.
Centrally of the outwardly convex portion 12A, 12B there is provided an opening O
into which is to be located a two part blending means 14. The shaft part 14A of the
blending means 14 has at one end connection means for connecting the blending means
to the motor drive 41 and has a abaft 16 which over its outer surface 50 locates in an
opening 56 in the blending element part 14B.
Assembly of the blending means with the lid 12 is by locating shaft part 14A through
the opening O and through the opening 56 in the part 14B. The surface SO may be
formed with a shoulder to locate with the outer end of the opening 56, or the parts 14A
and 14B may be welded together after assembly. The surface 50 locates with the
surfaces of the opening O to define a bearing surface which is of relatively small
diameter to reduce the potential for the bearing surfaces to overheat
Also formed in the portion 12B of the lid 12 is an opening 58 which is provided ss an
access opening for accessing the contents of the container after blending, for example
through a straw.
To be located over the opening 58 during blending is a removable closure or label 58A
which is adhesively applied to the lid and is peelable therefrom when required.
Referring now to Fig. 15 there is shown an alternative arrangement for supporting an
assembly of container 10 and lid 12 daring a blending operation. The assembled
container 10 and lid 12 are located inverted on a support 42 of a housing for the drive
motor, as previously described.
Located above the assembly in the blending position is a clamping arrangement 75
inclliding a reciprocal container engagement member 77 carried an the lower end of an
actuator 78 which is in turn driven by an actuator motor 80 to move up and down
towards and away from the container.
The clamping assembly is mounted on a rigid mounting bracket 82 for movement
relative thereto through a compression spring 84, the assembly being movably
supported by a support bolt 86. Movement of the assembly towards me bracket 82 is
against the resistance of the compression spring 84 and mere is also provided a switch
88 which detects movement of the actuator relative to the bracket 82 against the action
of the spring 84.
The clamping member 77 is arranged to engage the narrow end of the container 10 to
clamp it into position during blending and as the central portion 77A which ia shaped to
match the cross-section of the container to be engaged. Bxtending around the central
area 77A is a safety ring 88 in the form of an annular ring movable rotative to the
member 77 against spring means 77B. Movement of the ring 88 against the spring
means is detected by a switch 79 which, when actuated, stops movement of the actuator
78 and actuator motor 80. This arrangement ensures mat obstructions between the
member 77 and the container, such as an operator's fingers, are detected to stop
operation of the clamping arrangement
In operation of the clamping assembly of Fig. 15 after an assembly of container and lid
hss been placed on the support 42, the actuator motor is actuated to cause the clamping
member 77 to move downwards into engagement with the end of the container. A
predetermined pressure is applied to the end of the container to bring about a clamping
action between the support 42 and the clamping member 77 and between the lid 12 and
the container 10. This ensures that the assembly of container and lid is adequately
made and support is sufficient during the blending operation. Due to the way in which
the clamping arrangement is supported at its upper end there is detected a
predetermined pressure on the container through movement relative to the bracket 22
which is detected by the switch 88 which is irrespective of the size of the container so
the container can have an axial dimension at positions P1 or P2 or at any positions in
between. Whatever the size of the container, as soon as the predetermined clamping
pressure has been reached the clamping operation is complete and there is no further
movement of the clamping member.
It will be appreciated that the blending apparatus can be programmed to operate
according to the size of container used and the contents of the container which may
require different blending times. As described blending apparatus detects the size of
container which may also determine the blending duration. However, in addition, the
operator can set the blending duration through the operator controls.
Referring now to Fig. 16 there is shown blending apparatus in which the same reference
numbers are, again, given to parts similar to those of previous embodiments. The
apparatus shown in Fig. 16 incllides a container 10 and a combined lid 12 and blending
means 14 which are of similar form to those shown in Fig. 3 and others of the drawings.
The assembled containers and lid are inverted for a blending operation to the position
shown and such inversion can be done manually or by locating the containers 10 in a
holder 43 shaped to the external shape of me container 10.
The holder 43 may be rotatable about axis A-A from an upright position in which the
container is located into the holder, to an inverted position in which the blending means
14 it placed in driving engagement with the drive motor 40 for a blending operation.
The container 10 is generally made of stiff coated paper or card which is formed with
an overlapped portion running in the lengthwise direction of the container. This
construction can result in potential problems with leakage between the lid and the
inside wall of the container where the overlap occurs.
In order to mitigate any potential leakage there is provided a clamping arrangement
whereby the outer surface of the container adjacent the lid has applied to it inwardly
directed clamping forces to assist in sealing the inner surface of the container against
the inwardly directed portion of the lid which locates against said inner surface.
In the illustrated arrangement clamping is by providing an air chamber 90 extending
around the outside of the container 10 towards its wide end and having a radially inner
flexible wall 92 which is arranged to contact the outer wall of the container so that
when the chamber 90 has compressed gas admitted the wall 92 is caused to extend
radially inwards against the container wall. It compresses against the wall to seal the
wall against the lid and thereby seal against any leaks.
To assist in the sealing action, there may be inserted into lid over the outwardly
directed circumferential opening extending around the lid portion 12C, a circular
abutment member 94. Thus, as the wall 92 filled with compressed gas to expand
inwardly against the container wall, abutment member 94 acts as an abutment to resist
such movement and act to assist as a seal.
Compressed gas to the chamber 90 is supplied by a suitable compressor through an
inlet tube 96 and the tube 96 and chamber 90 are incorporated into the holder 43 which
holder is directed downwardly to hold the assembly onto me base 42 during blending,
as shown by the arrows F.
The chamber 90 is inflated or charged wim gas at the commencement of the container
inversion action and, upon completion of the blending, me tube is deflated so that the
container with its blending contents can be removed from the holder 43.
Air to the chamber 90 may be ducted through tube 98 from an inlet 99 tying along the
axis A so that the air can be ducted before and during blending and whilst the holder is
rotated.
Instead of using the inflated ring arrangement shown in Fig. 16, a mechanical clamping
arrangement can be used whereby a metal ring (not ahown) in me position of chamber
90 extendi around me container and is moved radially in and out to clamp the
container.
Usually clamping around the container will be needed before the container is inverted,
during blending, and until the container is upright again.
WE CLAIM:
1. Mixing apparatus comprising a container base and a container lid, the
container lid having mounted thereon a rotatable mixing element for mixing
contents of the container when drive means external to the container is
operated, the container lid comprising a rim portion defining a circumferential
slot into which the top edge of the container is located when the lid and
container are assembled, wherein an outwardly convex portion is formed on the
lid within the rim portion, the convex portion inclliding the opening into which
the mixing means is located.
2. Mixing apparatus according to claims 1 wherein the outwardly convex
portion lies substantially level with the upper end of the container, when the lid
is located on the open end of the container.
3. Mixing apparatus according to claim 1 wherein container lids are
arranged to be nestable or stackable with other container lids, when not
assembled with the container bases, one container lid being located inside
another.
4. Mixing apparatus according to claim 1 wherein the slot is defined by an
outer portion arranged to extend around the top edge of the container, and an
inner portion arranged to extend into the container in contact with or closely
adjacent the inner wall of the container.
5. Mixing apparatus according to claim 4 wherein a curvilinear join is
provided between the inner and outer portions of the slot.
6. Mixing apparatus according to claim 4 wherein the inner portion extends
between two and twelve times the distance of the outer portion.
7. Mixing apparatus according to claim 1 comprising a support for an
assembled container and lid, and a clamping member movable to engage the
end of the container opposite the lid and locate the assembly during operation
of the mixing element, and wherein the clamping member incllides a clamping
surface engageable with the container and extending beyond the side edges of
the container and comprising a switch for detecting an obstruction to a
clamping action.
8. Mixing apparatus according to claim 7 wherein the clamping member is
reciprocally movable and, upon contacting the container to clamp the assembly,
applies a predetermined force to the container in the direction towards the
support.
9. Mixing apparatus according to claim 8 wherein the clamping member is
connected to a fixed member through spring means and, upon the clamping
force exceeding a predetermined level, the spring means compresses and a
signal is generated to stop movement of the clamping member.
10. Mixing apparatus according to claim 1 wherein the mixing element is
assembled onto the lid by first inserting a shaft portion through an opening in
the lid, and locking the mixing element onto the shaft portion.
11. Mixing apparatus according to claim 10 wherein the mixing element
clips onto the shaft portion and is secured thereto by a shoulder on the shaft
portion and/or by welding.
12. Mixing apparatus according to claim 10 comprising lubrication means to
permit the contents of the container, during mixing, to contact and lubricate the
co-operating surfaces of the shaft portion and the opening in the lid. and
wherein the lubrication means incllides longitlidinal slots in the side walls of
constitute a sleeve for said shaft portion,the slots admitting the container contents to
act as lubrication.
13. Mixing apparatus according to claim 1 wherein the container lid incllides a
product access opening with closure means, the access opening being for accessing
the contents of the container after mixing.
14. Mixing apparatus according to claim 1 wherein the container lid incllides
means for holding product arranged to be mixed with material in the container before,
during or after operation of the mixing means.
15. A container lid for mounting on an open ended beverage container, the
container lid having located thereon a rotatable mixing element for mixing the
contents of the container when drive means external to the container is operated, the
container lid comprising a rim portion for fitting of the lid onto the open end of the
container, wherein the lid incllides an outwardly convex portion formed within the rim
portion, the convex portion inclliding the opening through which the mixing element
extends.
16. A container lid according to claim 15 wherein the outwardly convex portion is
of a curvilinear dome shape and the mixing means is located centrally thereof.
17. A container lid according to claim 15 wherein the outwardly convex portion is
semi-spherical or part semi-spherical.
18. A container lid according to claim 15 wherein the outwardly convex portion is
transparent.
19. A container lid according to claim 15 wherein the lid defines an internal region
in which the mixing means operates, said region having curved surfaces.
20. A container lid according to claim 15 wherein the lid incllides a product access
opening with closure means, the access opening being for accessing the contents of
the container after mixing.
21. A container lid according to claim 15 wherein the outwardly convex portion is
level with the rim portion.
22. A container lid according to claim 15 wherein the outwardly convex portion
projects above the rim portion.
23. A container lid for mounting on an open ended beverage container, the
container lid having located thereon a rotatable mixing element for mixing the
contents of the container when drive means external to the container is operated,
wherein the lid defines an internal region in which the mixing element operates, said
region having curved surfaces and the mixing element being located centrally thereof.
24. A container lid according to claim 23 wherein the internal region is of
carvilinear dome shape.
25. A container lid according to claim 23 wherein the lid incllides a product access
opening with closure means, the access opening being for accessing the contents of
the container after mixing.
26. A container lid for mounting on an open ended beverage container, the
container lid having located thereon a rotatable mixing element for mixing the
contents of the container when drive means external to the container is operated,
wherein the lid comprises a rim portion defining a circumferential slot into which the
top edge of the container is located when the lid and container are assembled.
27. A container lid according to claim 26 wherein the slot is defined by oppositely-
directed circumferential portions, a first of said portions lying in contact with or
closely adjacent the inner side wall of the container and extending into the container
when the lid and container are assembled together, and wherein the other of said
circumferential portions is spaced inwardly of the side wall and has a curvilinear join
will said first portion.
28. A container lid according to claim 27 wherein the inner portion extends
between two and twelve times the distance of the outer portion.
29. Mixing apparatus comprising a container base and a container lid, the container
lid having mounted thereon a rotatable mixing element for mixing the contents of the
container when drive means external to the container is operated, wherein the
apparatus further comprises a support for an assembled container and lid with the lid
located on the support, and a clamping member movable to engage the end of the
container opposite the lid and locate the assembly during operation of the mixing
element, said clamping member inclliding a clamping surface engageable with the
container and extending beyond the side edges of the container and comprising switch
means for delecting an obstruction to a clamping action.
30. A container lid for mounting on an open ended beverage container, the
container lid having located thereon a rotatable mixing element inclliding a shaft
portion extending through the lid and having, at one end, means for connection to a
drive motor external to the container and, at the other end, a blender element for
mixing the contents of the container when the drive means is operated, wherein the
blender element is arranged to be assembled with the shaft portion after the shaft
portion is located in said opening.
31. A container lid according to claim 30 wherein the blender element incllides an
opening through which the shaft portion is located to lock into said opening.
32. A container lid according to claim 30 wherein the blender element clips onto
the shaft portion and is secured thereto by shoulder means on the shaft portion and/or
by welding.
33. A container lid according to claim 30 comprising lubrication means to permit
the contents of the container, during mixing, to contact and lubricate co-operating
surfaces of the shaft portion and the opening in the lid, and wherein the lubrication
means incllides longitlidinal slots in the side walls of the opening which constitute a
sleeve for said shaft portion, the slots admitting the container contents to act as
lubrication.
34. A container lid for mounting on an open ended beverage container, the
container lid having located thereon a rotatable mixing element for mixing the
contents of the container when drive means external to the container is operated,
wherein the rotatable mixing element incllides blades having flat portions configured
to rest against or adjacent the upper surface of a lid of the same kind and
configuration, when stacked one on top of another.
3:5. A container lid for mounting on an open ended beverage container, the
container lid having located thereon a rotatable mixing element for mixing the
contents of the container when drive means external to the container is operated,
wherein the lid incllides an upper portion having an annular gap, and an annular lower
portion which is intended to locate in the annular gap of a lid of the same kind and
configuration, when stacked one on top of another.
36. A container lid for mounting on an open ended beverage container, the
container lid having located thereon a rotatable mixing element for mixing the
contents of the container when drive means external to the container is operated, the
container lid comprising a rim portion defining a circumferential slot into which the
top edge of the container is located when the lid and container are assembled, wherein
the slot is defined by an outer portion arranged to extend around the top edge of the
container, and an inner portion arranged to extend into the container in contact with or
closely adjacent the inner wall of the container.
37. A container lid according to claim 36 wherein a curvilinear join is provided
between the inner and outer portions of the slot.
38. A container lid according to claim 36 wherein the inner portion extends
between two and twelve times the distance of the outer portion.

The invention provides mixing apparatus which has a container base (10) and a
container lid (12) with the lid carrying mixing means (14) extending through the
lid with at one end a mixing element and at the other end a drive connection to a
drive motor. When the drive is operated the mixing element mixes the contents
of the container, usually when the container is inverted. The lid has a rim
portion with a circumferential slot (13) and the top edge of the container (1013)
is located into the slot when the lid is assembled with the container whereby to
improve connection between the lid and the container during mixing. The lid
within the rim portion carries the mixing means and, during mixing, the
assembly is held to lock the assembly together.

Documents:

258-KOLNP-2006-CORRESPONDENCE.pdf

258-KOLNP-2006-FORM 27.pdf

258-kolnp-2006-granted-abstract.pdf

258-kolnp-2006-granted-claims.pdf

258-kolnp-2006-granted-correspondence.pdf

258-kolnp-2006-granted-description (complete).pdf

258-kolnp-2006-granted-drawings.pdf

258-kolnp-2006-granted-examination report.pdf

258-kolnp-2006-granted-form 1.pdf

258-kolnp-2006-granted-form 13.pdf

258-kolnp-2006-granted-form 18.pdf

258-kolnp-2006-granted-form 2.pdf

258-kolnp-2006-granted-form 26.pdf

258-kolnp-2006-granted-form 3.pdf

258-kolnp-2006-granted-form 5.pdf

258-kolnp-2006-granted-reply to examination report.pdf

258-kolnp-2006-granted-specification.pdf

258-kolnp-2006-granted-translated copy of priority document.pdf

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Patent Number

233862

Indian Patent Application Number

258/KOLNP/2006

PG Journal Number

16/2009

Publication Date

17-Apr-2009

Grant Date

16-Apr-2009

Date of Filing

03-Feb-2006

Name of Patentee

MCGILL TECHNOLOGY LIMITED

Applicant Address

MCGILL TECHNOLOGY BUILDING, ENDCAVOUR PARK, LONDON ROAD, ADDINGTON, WEST MILLING, KENT ME 19 5TW

Inventors:

#	Inventor's Name	Inventor's Address
1	MCGILL, SHANE, ROBERT	MCGILL TECHNOLOGY BUILDING, ENDCAVOUR PARK, LONDON ROAD, ADDINGTON, WEST MILLING, KENT ME 19 5TW

PCT International Classification Number

A47J 43/042

PCT International Application Number

PCT/GB2004/003432

PCT International Filing date

2004-08-09

PCT Conventions:

#	PCT Application Number	Date of Convention	Priority Country
1	0318584.0	2003-08-07	U.K.