GRINDER, METHOD FOR OPERATING IT, AND GRINDING DISK

Abstract

A grinder having a motor, wherein the grinder can be connected to a grinding disk. The grinder is configured to enable a wobbling movement, in addition to a grinding movement in a flat plane, of the grinding disk when the grinding disk is connected to the grinder. As a result, the grinder is able to perform a grinding movement, which constitutes a superimposition of a grinding movement in a flat plane and a wobbling movement of the grinding disk. This makes it possible to operate the grinder in two operating modes, the wobbling movement being able to be stopped by an arresting device. method for operating a grinder and a grinding disk for the grinder, the grinding disk having an unbalance for assisting the wobbling movement is also provided.

Claims

1-15. (canceled)

16. A grinder comprising: a motor, the grinder connectable to a grinding disk and configured to enable a wobbling movement, in addition to a grinding movement in a flat plane, of the grinding disk when the grinding disk is connected to the grinder.

17. The grinder as recited in claim 16 wherein the grinding movement in the flat plane and the wobbling movement of the grinding disk are superimposed.

18. The grinder as recited in claim 16 wherein when the wobbling movement is being carried out, only a part of the grinding disk is in contact with an underlying surface to be machined.

19. The grinder as recited in claim 16 further comprising a grinding shaft connected to the grinding disk, wherein the grinding shaft has a rigid portion and a wobbling portion.

20. The grinder as recited in claim 19 wherein the wobbling movement of the grinding disk is enabled by a wobbling movement of the grinding shaft.

21. The grinder as recited in claim 19 wherein the grinding shaft has a fixed point dividing the grinding shaft into the rigid portion and the wobbling portion.

22. The grinder as recited in claim 19 further comprising a flexible mounting for the grinding shaft in a region of the wobbling portion of the grinding shaft, in order to enable the wobbling movement.

23. The grinder as recited in claim 22 wherein the flexible mounting of the grinding shaft has an elastic element, in order to enable the wobbling movement.

24. The grinder as recited in claim 22 further comprising an arrester for securing the flexible mounting.

25. The grinder as recited in claim 16 further comprising a drive coupling for damping vibrations.

26. A grinding disk for the grinder as recited in claim 16, wherein the grinding disk has an unbalance for assisting the wobbling movement.

27. The grinding disk as recited in claim 26 wherein the unbalance is provided by virtue of the following: a) an asymmetrical arrangement of grinding elements on the grinding disk; b) grinding elements of different sizes; or c) an asymmetric configuration of a basic body of the grinding disk.

28. A method for operating the grinder as recited in claim 16, the method comprising the following steps: a) providing the grinder; and b) operating the grinder, the grinder performing a grinding movement constituting a superimposition of a grinding movement in a flat plane and a wobbling movement of the grinding disk.

29. The method as recited in claim 28 wherein the wobbling movement can be switched off by actuating an arrester.

30. The method as recited in claim 28 wherein the grinder is operable in two work modes, wherein, in a first work mode, the grinder performs a grinding movement in the flat plane or a further flat plane, and wherein in a second work mode, the grinder performs a grinding movement constituting the superimposition of the grinding movement in the flat plane and the wobbling movement of the grinding disk.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Further advantages will become apparent from the following description of the figures. The figure, the description and the claims contain numerous features in combination. A person skilled in the art will expediently also consider the features individually and combine them to form useful further combinations.

[0029] Identical and similar components are denoted by the same reference signs in the figure, in which:

[0030] FIG. 1 shows a side view of a preferred configuration of the proposed grinder,

[0031] FIG. 2 shows a schematic depiction of the movement of the grinding disk and of the grinding shaft,

[0032] FIG. 3 shows a schematic depiction of a preferred configuration of the grinding disk with an unbalance.

DETAILED DESCRIPTION

[0033] FIG. 1 shows a preferred configuration of the proposed grinder 10. The grinder 10 has a grinding disk 12, which is driven by a motor M of the grinder 10. A grinding shaft 14, which transmits the movement of the motor M to the grinding disk 12, is present between the motor M and the grinding disk 12. The grinding shaft 14 has a rigid portion 16 and a wobbling portion 18, wherein the rigid portion 16 forms an upper region of the grinding shaft 14 and the wobbling portion 18 forms a lower region of the grinding shaft 14. The two regions 16, 18 are preferably separated from one another by a fixed point 20, wherein a rigid, fixed mounting for the grinding shaft 14 is provided in the fixed point 20. The fixed point 20 preferably constitutes a vibration node for a wobbling movement of the grinding shaft 14 or of the grinding disk 12. Furthermore, a drive coupling element 32 for vibration damping may be provided in the region of the fixed point 20. A flexible mounting 22 of the grinding shaft 14 is provided in the lower region of the grinding shaft 14, which constitutes the wobbling portion 18 of the grinding shaft 14. The flexible mounting 22 advantageously allows the wobbling movement of the grinding shaft 14 or of the grinding disk 12. The flexible mounting 22 preferably comprises an elastic element 24. Furthermore, an arresting device 26, which makes it possible to switch off the wobbling movement of the grinding disk 12 or of the grinding shaft 14, may be provided in the region of the flexible mounting 22. The flexible mounting 22 of the grinding shaft 14 can be secured by the arresting device 26, with the result that the wobbling movement of the grinding disk 12 or of the grinding shaft 14 can be suppressed by the securing.

[0034] FIG. 2 shows a schematic depiction of the movement of the grinding disk 12 and of the grinding shaft 14. The object to be machined, such as for example an underlying surface U, is depicted in the lower region of FIG. 2. The fixed point 20 or the vibration node 20 of the wobbling movement of the grinding disk 12 or of the grinding shaft 14 is depicted in the upper region of FIG. 2. Possible positions of the grinding disk 12 or of the grinding shaft 14, while the grinding disk 12 or the grinding shaft 14 carries out a wobbling movement, are depicted in the middle region of FIG. 2. It can clearly be seen that only a respective part or a partial portion of the grinding disk 12 is in contact with the underlying surface U, with the result that the contact pressure of the user acts on the underlying surface in particular in this contact region between the grinding disk 12 and the underlying surface U. This makes it possible to ensure a particularly high abrasive-removal power of the superimposed grinding movement. Surprisingly, with the invention it is also possible to obtain a particularly homogeneous grinding pattern. As can be seen in FIG. 2, the unit composed of the grinding shaft 14 and the grinding disk 12 imitates the circular movement of a thread pendulum, wherein the grinding disk 12 corresponds to the pendulum body and the fixed point 20 corresponds to the suspension point of the thread pendulum. The region of the grinding shaft 14 that is depicted in FIG. 2 preferably represents the lower, wobbling portion 18 of the grinding shaft 14.

[0035] FIG. 3 shows a schematic depiction of a preferred configuration of the grinding disk 12 with an unbalance. The exemplary embodiment of the invention that is depicted in FIG. 3 shows a basic body 30 of a grinding disk 12 and a series of grinding elements 28. The grinding elements 28 preferably form the grinding means; for example, this may be diamond grinding elements or diamond segments. The grinding elements 28 are preferably on an outer edge of the basic body 30 of the grinding disk 12. The unbalance of the grinding disk 12 can act in different ways. In the example of the grinding disk 12 depicted in FIG. 3, the grinding element 28 on the bottom right on the grinding disk 12 or on the basic body 30 is only half as large as the other grinding elements 28. This results in asymmetry in the configuration of the grinding disk 12, which causes an unbalance of the grinding disk 12. As an alternative or in addition, the basic body 30 of the grinding disk 12 may have an unsymmetric form. Furthermore, there is the option of arranging the grinding elements 28 asymmetrically on the grinding disk 12 or on the basic body 30.

LIST OF REFERENCE SIGNS

[0036] 10 Grinder [0037] 12 Grinding disk [0038] 14 Grinding shaft [0039] 16 Rigid portion of the grinding shaft [0040] 18 Wobbling portion of the grinding shaft [0041] 20 Fixed point or vibration node [0042] 22 Flexible mounting [0043] 24 Elastic element [0044] 26 Arresting device [0045] 28 Grinding elements [0046] 30 Basic body of the grinding disk [0047] 32 Drive coupling element [0048] M Motor [0049] U Underlying surface