Title of Invention

AN IMPROVED ARRANGEMENT IN A MOBILE MACHINE FOR SCREEDING FLOOR SURFACES

Abstract

An improved arrangement in a mobile machine for screeding floor surfaces comprising a housing with a planet disk (3), which is rotatably supported in the bottom of the said housing and driven by a drive motor (1), and which carries an even number of up to six but not less than four screeding disks, operatively connected to the drive motor (1) and defining one screeding plane, characterized in that the operative connection comprises, on the one hand, belt sheaves (4b1-4b4) belonging to the screeding disks, over which sheaves and over deflection sheaves (5) arranged between the belt sheaves a belt (6) runs in such a way that the belt bears against a part of the circumference of the belt sheaves, which alternating from belt sheave to belt sheave lies alternately closest to the centre of the planet disk (3) and furthest away from the said centre, and on the other hand, a belt (7), which runs between a belt sheave (1a) arranged on the shaft of the motor (1) and one of the belt sheaves (4b1-4b4) belonging to the screeding disks.

Full Text

An Improved Arrangement in a mobile machine for screeding floor surfaces The present invention relates to an improved arrangement in a mobile machine for screeding floor surfaces. Reference is made to US 5637032 A, US 1069803 A, US 4097950 A, FR2073627 A5, and FR 11 08781 A as examples of the prior art. US 4 097 950 discloses a device for scrubbing surfaces having pairs of freely rotatable brushes each mounted on a shaft having an offset tip portion. Each shaft is mounted on a rotating support plate and half of the shafts rotate clockwise and the other half rotate counter-clockwise. In the preferred embodiment, the scrubbers have slanted bristles which bias the rotation of each scrubber in the direction of rotation of the shaft it is mounted upon. US 5 637 032 relates to an arrangement for a mobile surfacing machine, preferably for the surfacing of stone floors. A frame supports a drive motor with a motor shaft. A planet disc is rotatably mounted in the frame, with three surfacing discs arranged on shafts rotatably mounted on the planet disc. The surfacing discs are in operative connection with a belt pulley arranged on the drive shaft of the motor via a drive belt running around first belt pulleys arranged on the aforementioned shafts. The shafts of the surfacing discs are so arranged, for the purpose of controlling the rotation of the planet disc, as to be in operative connection with the frame. The operative connection comprises, for example, a belt pulley attached to the frame, second belt pulleys arranged on the shafts of the surfacing discs, and a second belt running around these and the belt pulley attached to the frame. Screeding machines of the aforementioned type function inherently well, but as the material in the screeding discs used to machine the floor surfaces is progressively developed, thereby enabling it to remove more floor material per unit time than before, there is a desire for more available power for machining of the floor material. The object of the present invention is to produce an arrangement in a screeding machine of the type referred to in the introductory part, which has an improved removal capability compared to known screeding machines. The present invention provides an improved arrangement in a mobile machine for screeding floor surfaces comprising a housing with a planet disk, which is rotatably supported in the bottom of the said housing and driven by a drive motor, -and which carries an even number of up to six but not less than four screeding disks, operatively connected to the drive motor and defining one screeding plane, characterized in that the operative connection comprises, on the one hand, belt sheaves belonging to the screeding disks, over which sheaves and over deflection sheaves arranged between the belt sheaves a belt runs in such a way that the belt bears against a part of the circumference of the belt sheaves, which alternating from belt sheave to belt sheave lies alternately closest to the centre of the planet disk and furthest away from the said centre, and on the other hand, a belt, which runs between a belt sheave arranged on the shaft of the motor and one of the belt sheaves belonging to the screeding disks. In a preferred embodiment, an improved arrangement in a mobile machine for screeding floor surfaces comprising a housing with a planet disk, which is rotatably supported in the bottom of the said housing and which carries a number of rotatably supported screeding disks, distributed over said planet disk and operatively connected to a drive motor, and defining one screeding plane, is characterised in that the planet disk is operatively connected to a second drive motor, intended solely for driving the planet disk ; the number of screeding disks constitutes an even number up to a maximum of six ; and viewed in the direction of rotation of the planet disk, half the number of screeding disks have a direction of rotation coinciding with the planet disk and the remaining screeding disks have an opposing direction of rotation. The arrangement according to the invention furthermore has one or more of the characteristic features specified hereinafter. The invention moreover affords the following advantages : The screeding machine designed according to the invention has an improved balance and reduced lateral rotation, which especially in the case of a manually operated machine makes it easier to hold and control. More even screeding is achieved ; with known machines it is easy to end up with a machining mark having a plate-shaped cross-section, which means that it is necessary to screed with a relatively large overlap, in order to obtain a plane finish. The invention will be explained in more detail below with reference to the accompanying drawings in which fig. 1a, in an oblique, perspective view from beneath, shows by way of example a screeding unit in a screeding machine according to the invention, having a drive motor and a dished planet disk, which accommodates a belt transmission. Fig. 1b shows the drive motor and the planet disk in fig. 1a in an oblique perspective view from above. Fig. 1c shows essentially the same view as fig. 1a, but the planet disk and the belt transmission are covered by a cover plate with openings for the machine's screeding disks. Fig. 2, by way of an example, shows a plan view of a system of belts for driving the screeding machine planet disk and screeding disks of the type used in the embodiment according to figures la, 1b. Fig. 3 in a side view illustrates an embodiment of a screeding unit according to the invention, in which the screeding unit planet disk is driven by a separate drive motor. In figures la, lb, 1 denotes a drive motor mounted on a motor plate 2. The motor plate 2 is designed to be fitted in a screeding machine casing, not shown further, by means of a screw nut connection. 3 denotes a planet disk, which is supported so that it can rotate in relation to the motor plate 2 and is shaped like a dish open at the bottom. When the screeding unit is ready for use the dish is covered by a protective plate having openings for the screeding disks. The dish with the protective plate forms a protected space for the drive mechanism, as will be explained below. This space accomodates four symmetrically located holders 4al-4a4 for screeding disks 4cl-4c4, the holders being supported so that they can rotate, in the planet disk 3. For the sake of clarity, the screeding disks have been omitted from fig. la but are shown in fig. lc, in which the directions of rotation, according to the invention, of the screeding disks 4cl-4c4 and the planet disk 3 are also illustrated by arrows 3p and 4p respectively. 3a denotes a plate having openings for the screeding disks 4cl-4c4, designed to protect the belt transmissions in the dished planet disk 3. A belt sheave 4bl-4b4 is connected to each holder 4al-4a4 for driving each screeding disk in the manner characteristic of the invention. A belt 6 runs over the belt sheaves 4bl-4b4 and over deflection sheaves 5 arranged between them. A belt sheave 1 a arranged on the shaft of the motor 1 is designed to drive the belt sheave 4b2 by way of a belt 7, thereby causing the other belt sheaves to rotate. Since the belt 6 runs over that section of the circumference situated nearest to the centre of the planet disk 3 in respect of the belt sheaves 4bl and 4b3 and over the section of the circumference situated furthest away from the said centre in respect of the belt sheaves 4b2 and 4b4, the belt sheaves 4bl, 4b3 assume opposing directions of rotation relative to the belt sheaves 4b2, 4b4, thereby providing the characteristic feature of the present invention, namely that adjacent screeding disks have opposite directions of rotation. From fig. lb it can be seen that shafts of the belt sheaves 4bl, 4b3 (connected to the respective screeding disks 4cl, 4c3) protrude from the dished planet disk 3 and form belt sheaves 8. 9 denotes a belt sheave fixed to the motor plate 2. A belt 10, by means of which the rotation of the motor 1 is transmitted to the planet disk 3 by way of the belt sheave la, the belt 7, the belt sheave 4a2, the belt 6 and the belt sheaves 4b 1, 4b3, runs over the belt sheaves 8 and 9. It may be noted in this connection that the planet disk 3 has the same direction of rotation as the screeding disks 4c2, 4c4. From this it follows that these screeding disks in an area furthest away from the centre of the planet disk 3 have a higher peripheral speed in relation to a surface that is to be screeded than do the screeding disks 4c 1, 4c3 in the same area. If so required, this can, as the person skilled in the art will appreciate, be compensated for by giving the belt sheaves 4b 1, 4b3 and 4b2, 4b4 correspondingly different diamters. For the sake of clarity all belts and belt sheaves are drawn in fig. 2. The person skilled in the art will also appreciate that some or all of the belt transmissions may be replaced by gear transmissions or transmissions having a frictional engagement. It will also be appreciated that, without departing from the idea of the invention, six screeding disks supported by holders may be arranged on the planet wheel 3, each holder being connected to a belt sheave. A belt runs over the belt sheaves and over intermediate deflection sheaves in the manner already explained, which means that adjacent screeding disks have opposite directions of rotation. At the same time the planet disk carrying the screeding disks is driven in the same way as explained earlier. In this embodiment also, the belt transmissions can be replaced wholly or in part by gear transmissions or transmissions having a frictional engagement. In a particular embodiment of the arrangement according to the invention, the planet disk 3 is driven by its own motor 11. The belt 10, which in the embodiment according to figures 1 a, lb runs over belt sheaves 8, then runs instead over the belt sheave 1 la of the motor 11. Separate driving of the planet disk 3 affords two advantages : firstly it is possibly to freely select the direction of rotation of the planet disk 3 and secondly the speed of rotation can be selected irrespective of the speed of the screeding disks, in order to obtain the optimum screeding result. A gear transmission can obviously also be used in this embodiment instead of the belt transmission. Although the invention above has been primarily illustrated and explained in connection with a screeding unit for a manually operated screeding machine, it will be obvious that the screeding unit according to the invention affords the same advantages when it is fitted to a powered screeding machine. It is also advantageous here that lateral forces occuring are minimised and that the effective screeding profile of the screeding unit permits screeding with little overlap. WE CLAIM : 1. An improved arrangement in a mobile machine for screeding floor surfaces comprising a housing with a planet disk (3), which is rotatably supported in the bottom of the said housing and driven by a drive motor (1), and which carries an even number of up to six but not less than four screeding disks, operatively connected to the drive motor (1) and defining one screeding plane, characterized in that the operative connection comprises, on the one hand, belt sheaves (4b1-4b4) belonging to the screeding disks, over which sheaves and over deflection sheaves (5) arranged between the belt sheaves a belt (6) runs in such a way that the belt (6) bears against a part of the circumference of the belt sheaves, which alternating from belt sheave to belt sheave lies alternately closest to the centre of the planet disk (3) and furthest away from the said centre, and on the other hand, a belt (7), which runs between a belt sheave (1a) arranged on the shaft of the motor (1) and one of the belt sheaves (4b1-4b4) belonging to the screeding disks. 2. An improved arrangement as claimed in claim 1, wherein the screeding disks that have a direction of rotation opposed to the planet disk (3) have a rotational speed, which is so much greater than the rotational speed of the screeding disks that have the same direction of rotation as the planet disk ; and at the periphery of the planet disk all screeding disks have approximately the same peripheral speed in relation to the surface that is to be screeded. 3. An improved arrangement in a mobile machine for screeding floor surfaces comprising a housing with a planet disk (3), which is rotatably supported in the bottom of the said housing and which carries a number of rotatably supported screeding disks, distributed over said planet disk and operatively connected to a drive motor (1), and defining one screeding plane, characterised in that the planet disk (3) is operatively connected to a second drive motor, intended solely for driving the planet disk (3) ; and the number of screeding disks constitutes an even number up to a maximum of six ; and viewed in the direction of rotation of the planet disk (3), half the number of screeding disks have a direction of rotation coinciding with the planet disk (3) and the remaining screeding disks have an opposing direction of rotation. 4. An improved arrangement as claimed in claim 3, wherein the operative connection between the planet disk (3) and its drive motor comprises a belt or gear transmission. 5. A mobile machine for screeding floor surfaces comprising : a housing with a planet disk (3) rotatably supported in the bottom of the housing and carrying a number of rotatably supported screeding disks, distributed over said planet disk (3) and operatively connected to a drive motor (1) fixedly connected to a motor plate (2), and defining one screeding plane, characterized in that the number of screeding disks constitutes an even number up to a maximum of six, half the number of screeding disks have a direction of rotation (4p) coinciding with that (3p) of the planet disk (3) and the remaining screeding disks have an opposing direction of rotation ; a transmission is arranged to connect two of said screeding disks (4cl, 4c3) having the same direction of rotation to the motor plate (2), such that rotation of said two screeding discs is transmitted to the motor plate, to rotate the planet disk (3) relative to the motor plate, and wherein the transmission comprises respective first and second belt sheaves (8, 9) connected to a respective one (4b 1, 4b3) of said screeding disks (4c 1, 4c3) having the same direction of rotation, a third belt sheave (9) mounted to the motor plate (2) and a belt (10) arranged between and in contact with said first, second and third belt sheaves. 6. The mobile machine for screeding floor surfaces as claimed in claim 5, wherein said planet disk comprises a hollow disk-shaped body, which when in use is arranged substantially in parallel with the floor surface. 7. The mobile machine for screeding floor surfaces as claimed in claim 6, wherein said screeding disks are arranged on a lower side of the planet disk, and the first and second belt sheaves are arranged on an upper side of the planet disk. 8. The mobile machine for screeding floor surfaces as claimed in claim 7, wherein said first and second belt sheaves are arranged on a respective shaft of a respective one of said screeding disks. 9. The mobile machine for screeding floor surfaces as claimed in claim 8, wherein said shafts protrude through the planet disk to the upper side of the planet disk. 10. The mobile machine for screeding floor surfaces as c-laimed in claim 5, wherein said two screeding disks (4c 1, 4c3) having the same direction of rotation are arranged on opposite sides of the motor plate. An improved arrangement in a mobile machine for screeding floor surfaces comprising a housing with a planet disk (3), which is rotatably supported in the bottom of the said housing and driven by a drive motor (1), and which carries an even number of up to six but not less than four screeding disks, operatively connected to the drive motor (1) and defining one screeding plane, characterized in that the operative connection comprises, on the one hand, belt sheaves (4b1-4b4) belonging to the screeding disks, over which sheaves and over deflection sheaves (5) arranged between the belt sheaves a belt (6) runs in such a way that the belt bears against a part of the circumference of the belt sheaves, which alternating from belt sheave to belt sheave lies alternately closest to the centre of the planet disk (3) and furthest away from the said centre, and on the other hand, a belt (7), which runs between a belt sheave (1a) arranged on the shaft of the motor (1) and one of the belt sheaves (4b1-4b4) belonging to the screeding disks.

Documents:

720-KOLNP-2003-CORRESPONDENCE 1.1.pdf

720-KOLNP-2003-CORRESPONDENCE 1.3.pdf

720-KOLNP-2003-CORRESPONDENCE 1.4.pdf

720-KOLNP-2003-CORRESPONDENCE-1.2.pdf

720-KOLNP-2003-CORRESPONDENCE.pdf

720-KOLNP-2003-FORM 27 1.2.pdf

720-KOLNP-2003-FORM 27-1.1.pdf

720-KOLNP-2003-FORM 27.pdf

720-KOLNP-2003-FORM-27.pdf

720-kolnp-2003-granted-abstract.pdf

720-kolnp-2003-granted-assignment.pdf

720-kolnp-2003-granted-claims.pdf

720-kolnp-2003-granted-correspondence.pdf

720-kolnp-2003-granted-description (complete).pdf

720-kolnp-2003-granted-drawings.pdf

720-kolnp-2003-granted-examination report.pdf

720-kolnp-2003-granted-form 1.pdf

720-kolnp-2003-granted-form 13.pdf

720-kolnp-2003-granted-form 3.pdf

720-kolnp-2003-granted-form 5.pdf

720-kolnp-2003-granted-form 6.pdf

720-kolnp-2003-granted-gpa.pdf

720-kolnp-2003-granted-priority document.pdf

720-kolnp-2003-granted-reply to examination report.pdf

720-kolnp-2003-granted-specification.pdf

720-KOLNP-2003-OTHERS 1.1.pdf

720-KOLNP-2003-PA 1.2.pdf

720-KOLNP-2003-PA 1.3.pdf

720-KOLNP-2003-PA-1.1.pdf

720-KOLNP-2003-PA.pdf