POLISHING AND/OR SANDING HEAD AS WELL AS POLISHING AND/OR SANDING MACHINE EQUIPPED WITH THIS HEAD

Abstract

A polishing and/or sanding head 1 has a frame and three discs movably coupled to the frame. Of these discs, a first disc 5 forms a round inner disc and a second disc 7 is annular and surrounding the first disc. These first and second discs are concentric and rotatable in opposite directions about their common center. The third disc 9 is also annular and is present around the second disc. This third disc is not rotatable but can make a circular movement about an imaginary axis. The discs are provided with a front side 5A-9A, which faces the surface to be treated during operation and on which a polishing or sanding sheet can be applied. Due to the presence of this third disc, which does not make a rotating but an eccentric movement, an even surface is obtained during polishing or sanding, on which no areas with a deviating appearance are present.

Claims

1. Polishing and/or sanding head (1) for a polishing and/or sanding machine for polishing and/or sanding a surface, comprising: at least two concentric discs (5, 7) provided with a front (5A, 7A), which during operation faces the surface to be treated and on which a polishing or sanding sheet can be applied, and a rear (5B, 7B), as well as a coupling (21) for coupling a driven shaft of the polishing and/or sanding machine to one of the discs (5), and a transmission (11A, 13A, 15A) present between the disc (5) coupled to the driven axle and/or the coupling (21) and the other disc (7), which transmission is such that the two discs rotate in opposite directions about a common center during operation, wherein: the polishing and/or sanding head comprises three discs (5, 7, 9) of which said two discs (5, 7) form part and of which the other disc (9) is connected via a further transmission (13B, 17B) to the coupling (21) or to one of the said two discs (5, 7), said further transmission (13B, 17B) is such that during operation the other disc (9) does not rotate but makes a circular movement about an imaginary axis.

2. Polishing and/or sanding head according to claim 1, wherein of the discs: a first disc (5) forms an inner disc, a second disc (7) is annular and is present around the first disc, and a third disc (9) is also annular and is present around the second disc.

3. Polishing and/or sanding head according to claim 2, wherein the first and second discs (5, 7) can rotate in opposite directions about their center and each point of the third disc (9) can make a rotational movement about an imaginary axis, where the distance from each point to the imaginary axis about which this point revolves is the same for all points.

4. Polishing and/or sanding head according to claim 1, 2 or 3, wherein: a first gear (11) is mounted on the rear side of the first disc (5), this first gear (11) and the first disc (5) being concentric, an annular second gear (13) with an external toothing (13B) and an internal toothing (13A) is mounted on the back of the second disc (7), this second gear (13) and the second disc (7) being concentric, between the first gear (11) and the second gear (13) there is at least one planet gear (15) meshing with the first gear (5) and with the internal teeth (13A) of the second gear (13), and the second transmission (13B, 17B) comprises at least one third gear (17) meshing with the external teeth (13B) of the second gear (13), said third gear (17) is connected via an eccentric (19) to the third disc (9).

5. Polishing and/or sanding head according to claim 4, wherein the eccentric (19) comprises a shaft eccentric with respect to the third gear (17) and being coupled to the third gear (17) and to the third disc (9).

6. Polishing and/or sanding head according to claim 5, wherein the shaft is mounted on the third gear (17) or on the third disc (9) and is rotatably provided in an opening (20) in the third gear or in the third disc, respectively.

7. Polishing and/or sanding head according to claim 4, wherein the polishing and/or sanding head comprises a frame (3) and the at least one planet gear (15) and the at least one third gear (17) are rotatably connected to the frame.

8. Polishing and/or sanding machine comprising a drive provided with a driven shaft, as well as a polishing and/or sanding head (1) according to claim 1 of which the coupling (21) is coupled to the driven shaft.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The invention will be explained in more detail below on the basis of an exemplary embodiment of the polishing and/or sanding head according to the invention shown in the drawings. Hereby:

[0021] FIG. 1 shows the polishing and/or sanding head in top view;

[0022] FIG. 2 shows the polishing and/or sanding head in bottom view;

[0023] FIG. 3 shows the polishing and/or sanding head in side view;

[0024] FIG. 4 shows the polishing and/or sanding head in section along line I-I in FIG. 1;

[0025] FIG. 5 shows the polishing and/or sanding head in section along line II-II in FIG. 1; and

[0026] FIG. 6 the polishing and/or sanding head in exploded view.

DETAILED DESCRIPTION OF THE DRAWINGS

[0027] FIGS. 1-3 show an embodiment of the polishing and/or sanding head according to the invention in top, bottom and side views, respectively. The polishing and/or sanding head 1 has a frame 3 and three discs 5, 7 and 9 movably coupled to the frame. Of these discs, a first disc 5 forms a round inner disc and a second disc 7 is annular and surrounds the first disc. These first and second discs 5 and 7 are concentric and rotatable in opposite directions about their common center 8. The third disc 9 is also annular and is provided around the second disc. This third disc 9 is not rotatable but can make a circular movement about an imaginary axis. The discs 5-9 are provided with a front side 5A-9A, which faces the surface to be treated during operation and on which a polishing or sanding sheet can be applied.

[0028] Gears are present at the rear 5B-9B of the discs 5-9. In FIGS. 4 and 5 the polishing and/or sanding head is shown in cross section along the lines I-I and II-II respectively indicated in FIG. 1 and in FIG. 6 the polishing and/or sanding head is shown in an exploded view. The transmissions formed by the gear wheels between the discs will be explained below on the basis of these figures. Mounted on the back side 5B of the first disc 5 is a first gear wheel 11 which is provided with external teeth 11A. Mounted on the back side 7B of the second disc 7 is a second annular gear 13 which has an internal toothing 13A and an external toothing 13B. Between the external gearing 11A and the internal gearing 13A are three planet gears 15 provided with external gearing 15A.

[0029] The gears 11-15 form a first gear that is present between the first and second discs and causes the discs to rotate in opposite directions. The planet gears 15 are mounted in frame 3 by means of bearing blocks 16. Furthermore, three third gears 17 provided with external gears 17B are mounted in frame 3 by means of bearing blocks 18. These third gears 17 form a second transmission with the second gear 13. Pins 19 are mounted on these third gears 17, which are located away from the center of the gears 17 and form an eccentric. These pins are rotatably present in openings 20 in the third disc 9 and ensure that this third disc 9 makes an eccentric movement whereby his third disc 9 does not rotate about its center.

[0030] The first gear wheel 11 is coupled to a coupling piece 21 with which this gear wheel can be coupled to a driven shaft of the polishing and/or sanding machine. Also attached to the frame is a handle 23 with which the polishing and/or sanding head can be moved over the surface to be treated.

[0031] Although the invention has been elucidated in the foregoing with reference to the drawings, it should be noted that the invention is by no means limited to the embodiment shown in the drawings. The invention also extends to all embodiments deviating from the embodiment shown in the drawings within the scope defined by the claims.