Machine Tool Device, Tool Unit and Machine Tool System

Abstract

A machine tool device, in particular a tool adapter, for connecting a tool, in particular a brush, to a tool holder of a machine tool, in particular an angle grinder, has at least one driver unit for a rotationally fixed connection to the tool and at least one fastening unit for axial fastening of the tool to the tool holder. The machine tool device has a positive locking unit, via which the driver unit and the fastening unit can be connected to one another in a rotationally fixed manner via a positive lock.

Claims

1. A machine tool device for connecting a tool to a tool holder of a machine tool, comprising: at least one driver unit configured to establish a rotationally fixed connection to the tool; at least one fastening unit configured to axially fasten the tool to the tool holder; and a positive locking unit configured to connect the driver unit and the fastening unit to one another in a rotationally fixed manner via a positive locking.

2. The machine tool device according to claim 1, wherein the fastening unit is configured to be fastened to the tool holder by a movement of the driver unit.

3. The machine tool device according to claim 2, wherein the driver unit has a mounting interface configured to cooperate with a mounting tool to generate the movement of the driver unit for fastening the fastening unit to the tool holder.

4. The machine tool device according to claim 1, wherein the driver unit has at least one driver element configured to establish a rotationally fixed connection to the fastening unit and the rotationally fixed connection to the tool.

5. The machine tool device according to claim 1, further comprising: at least one axial locking element configured to axially lock a connection of the fastening unit to the driver unit.

6. The machine tool device according to claim 1, wherein the driver unit and the fastening unit have a fit to one another which functions according to the poka-yoke principle.

7. The machine tool device according to claim 1, wherein the driver unit and the fastening unit are configured in one piece.

8. A tool unit comprising: a tool; and a machine tool device comprising: at least one driver unit configured to establish a rotationally fixed connection to the tool; at least one fastening unit configured to axially fasten the tool to a tool holder of a machine tool; and a positive locking unit configured to connect the driver unit and the fastening unit to one another in a rotationally fixed manner via a positive locking.

9. The tool unit according to claim 8, characterized in that the machine tool device can be detachably attached to the tool, in particular detachably without tools.

10. A machine tool system comprising: a machine tool; and a tool unit comprising: a tool; and a machine tool device comprising: at least one driver unit configured to establish a rotationally fixed connection to the tool; at least one fastening unit configured to axially fasten the tool to a tool holder of the machine tool; and a positive locking unit configured to connect the driver unit and the fastening unit to one another in a rotationally fixed manner via a positive locking.

11. The machine tool device according to claim 1, wherein the machine tool device is a tool adapter.

12. The machine tool device according to claim 1, wherein the machine tool device is configured to connect a brush to an angle grinder.

13. The machine tool device according to claim 1, wherein the fastening unit is configured to be fastened to the tool holder by a rotation of the driver unit.

14. The machine tool device according to claim 5, wherein the at least one axial locking element includes an O-ring configured to axially lock the connection of the fastening unit to the driver unit.

15. The machine tool device according to claim 5, wherein the at least one axial locking element is configured to axially lock the connection of the fastening unit to the driver unit in a detachable manner without tools.

16. The tool unit according to claim 8, wherein the tool is brush.

17. The machine tool system according to claim 10, wherein the machine tool is an angle grinder.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Further advantages follow from the description of the following drawings. The drawing shows an embodiment example of the disclosure. The drawing, the description, and the claims contain numerous features in combination. The skilled person will appropriately also consider the features individually and combine them into additional advantageous combinations.

[0026] Shown are:

[0027] FIG. 1 a machine tool system with a machine tool and with a tool unit in a cross-sectional view and

[0028] FIG. 2 perspective view of the tool unit with a tool and with a machine tool device in a dismantled state.

DETAILED DESCRIPTION

[0029] FIG. 1 shows a machine tool system 32 with a machine tool 16 and a tool unit 30. The machine tool 16 is designed as a hand-held machine tool. The machine tool 16 is designed as a rotary machine tool. The machine tool 16 is designed as an angle grinder. Alternatively, however, it is also conceivable that the machine tool 16 is designed as a screwing machine, as a drilling machine or as another hand-held machine tool which appears to a person skilled in the art to be useful, as a garden tool, for example as a lawn mower, as a power cutter or as another rotary machine tool which appears to a person skilled in the art to be useful.

[0030] The tool unit 30 has a machine tool device 10 for connecting a tool 12 to a tool holder 14 of the machine tool 16. The tool holder 14 is a part, preferably a sub-assembly, of the machine tool 16, which is preferably provided for holding, in particular fastening, the tool 12 to the machine tool 16, preferably via the machine tool device 10. The tool 12 is designed as a brush. Alternatively, however, it is also conceivable that the tool 12 is designed as a cut-off wheel, a polishing disc, a saw blade, a drill bit, a backing pad or any other tool that would appear useful to a person skilled in the art.

[0031] The tool holder 14 is provided for coupling the tool 12 to a drive unit (not shown here) of the machine tool 16 via a drive gear of the machine tool 16, in particular via a drive train of the machine tool 16. The drive unit has, for example, an electric motor or similar. Alternatively or additionally, it is conceivable that the drive unit has a pneumatic drive. The tool holder 16 has an axis of rotation 36. The tool holder 14 can be driven to rotate about the axis of rotation 36, preferably by the drive unit.

[0032] The machine tool device 10 is a tool adapter. The machine tool device 10 is designed to transmit torque from the tool holder 14 to the tool 12. The machine tool device 10 has at least one driver unit 18 for a rotationally fixed connection with the tool 12.

[0033] The machine tool device 10 has at least one fastening unit 20 for axially fastening the tool 12 to the tool holder 14. The fastening unit 20 is provided for axial fastening of the tool 12 to the tool holder 14 with respect to an axis of rotation of the tool 12 and/or the tool holder 14. The fastening unit 20 preferably has a fastening element 62 corresponding to the tool holder 14, preferably a thread, in particular an internal thread. The fastening element 62 is designed as an M14 thread in this example. Alternatively, however, it is also conceivable that the fastening element 62 is designed as a thread other than an M14 thread. The fastening unit 20 is preferably designed like a screw nut, in particular as a screw nut.

[0034] The fastening unit 20 has a tool holding element 68, in particular a projection. The tool holding element 68 is in contact with the tool 12 at least in a state of the machine tool device 10 attached to the tool 12, preferably at least in an operating state. The tool holding element 68 is intended to lock the tool 12 in the axial direction, in particular with respect to the axis of rotation 36 of the tool holder 14.

[0035] The machine tool device 10 has a positive locking unit 22, by means of which the driver unit 18 and the fastening unit 20 can be connected to one another in a rotationally fixed manner via a positive locking. In a state connected to the fastening unit 20, the driver unit 18 is non-rotatably connected to the fastening unit 20, preferably via the positive locking unit 22. The driver unit 18 is connected to the fastening unit 20 at least in one operating state, preferably non-rotatably, preferably via the positive locking unit 22. In a state connected to the tool 12, the driver unit 18 is non-rotatably connected to the tool 12. At least in one operating state, the driver unit 18 is connected to the tool 12 so that it cannot rotate. The machine tool device 10, in particular the driver unit 18 and/or the fastening unit 20, is/are non-rotatably connected to the tool 12 in a state connected to the tool 12, preferably at least in an operating state.

[0036] The machine tool device 10 has a flange 46. In a state of the machine tool device 10 attached to the tool holder 14, in particular at least in the operating state, the flange 46 rests against a bearing surface 48 of the tool holder 14. The driver unit 18 has a base body 50. The flange 46 is arranged on the driver unit 18, in particular on the base body 50 of the driver unit 18. The flange 46 is formed in one piece with the base body 50. The base body 50 has a recess 58, which is arranged in the center in particular. A thread 54 of the tool holder 14 is arranged in the recess 58 of the driver unit 18, at least in one operating state.

[0037] The tool 12 has a tool interface 52, in particular a tool hub, for connection to a tool holder of a machine tool. The tool interface 52, in particular the tool hub, of the tool 12 is provided for a force-locking and/or positive locking connection with a quick-clamping device of a tool holder of a further machine tool, in particular one that is different from the above-mentioned machine tool 16. The quick-clamping device is preferably free of a thread. The tool interface 52, in particular the tool hub, of the tool 12 is free of a thread. The tool holder 14 of the machine tool 16 is free of a quick-clamping device.

[0038] The tool holder 14 has the thread 54, in particular an external thread, for a connection with a further tool, in particular different from the above-mentioned tool 12, which has a thread, preferably an internal thread, corresponding to the thread 54 of the tool holder 14. The machine tool device 10, preferably the driver unit 18 and/or the fastening unit 20, is/are intended to be arranged at the tool interface 52, preferably the tool hub, of the tool 12. The machine tool device 10, in particular the driver unit 18 and/or the fastening unit 20, is/are arranged at the tool interface 52, in particular at the tool hub, in a state connected to the tool 12.

[0039] The machine tool device 10 is intended to connect a tool, in particular the tool 12, which is free of a thread and has a tool interface, in particular the aforementioned tool interface, for a connection to a quick-clamping device of a tool holder, to a tool holder 14, in particular the aforementioned tool holder 14, of a machine tool 16, in particular the aforementioned machine tool 16, which is free of a quick-clamping device corresponding to the tool interface 52 of the tool 12 and in particular has a thread 54, in particular the aforementioned thread 54, preferably an external thread, for a tool connection.

[0040] The machine tool device 10 has an axis of rotation 38 about which the machine tool device 10, in particular the driver unit 18 and/or the fastening unit 20, preferably rotates in at least one operating state, in particular in a state driven by the drive unit. The axis of rotation 38 of the machine tool device 10 runs at least substantially parallel to the axis of rotation 36 of the tool holder 14. The axis of rotation 38 of the machine tool device 10 extends congruently with the axis of rotation 36 of the tool holder 14, in particular at least in an operating state.

[0041] The driver unit 18 has an axis of rotation 40. In a state of the driver unit 18 connected to the fastening unit 20, the axis of rotation 40 of the driver unit 18 extends at least substantially parallel to an axis of rotation 42 of the fastening unit 20. In a state of the driver unit 18 connected to the fastening unit 20, the axis of rotation 42 of the driver unit 18 runs congruently with the axis of rotation 42 of the fastening unit 20. The axis of rotation 38 of the machine tool device 10 corresponds, in particular at least in a state of the fastening unit 20 connected to the driver unit 18, to the axis of rotation 40 of the driver unit 18 and the axis of rotation 42 of the fastening unit 20.

[0042] The tool 12 has a tool axis of rotation 44. The tool 12 can be driven to rotate about the tool axis of rotation 44, preferably at least in one operating state, via the tool holder 14 and the machine tool device 10, in particular by the drive unit. The tool axis of rotation 44 extends at least substantially parallel to the axis of rotation 36 of the tool holder 14 and/or to the axis of rotation of the machine tool device 10, in particular the axis of rotation 40 of the driver unit 18 and/or the axis of rotation 42 of the fastening unit 20, preferably at least in a state of the tool 12 arranged on the tool holder 14, preferably at least in an operating state. The tool axis of rotation 44 extends congruently with the axis of rotation 36 of the tool holder 14 and/or with the axis of rotation 38 of the machine tool device 10, in particular the axis of rotation 40 of the driver unit 18 and/or the axis of rotation 42 of the fastening unit 20, preferably at least in a state of the tool 12 arranged on the tool holder 14, preferably at least in an operating state.

[0043] The tool unit 30 has the tool 12. The machine tool device 10 can be detachably attached to the tool 12, in particular detachable without tools. The machine tool device 10 can be fastened to the tool 12, preferably detachably, by connecting the driver unit 18 to the fastening unit 20, preferably via an axial locking element 28 of the machine tool device 10.

[0044] The tool 12, in particular the tool interface 52, preferably the tool hub, is arranged between the driver unit 18 and the fastening unit 20 in a state connected to the machine tool device 10. At least a part of the fastening unit 20 and at least a part of the driver unit 18, preferably the flange 46 and/or a mounting interface 24, are arranged on opposite sides of the tool 12, in particular the tool interface 52, in particular at least in a state of the machine tool device 10 arranged on the tool 12.

[0045] The fastening unit 20 can be fastened to the tool holder 14 by a movement, in particular a rotation, of the driver unit 18. The driver unit 18 has the mounting interface 24, which is intended to cooperate with a mounting tool to generate a movement of the driver unit 18 for fastening the fastening unit 20 to the tool holder 14. The mounting tool is preferably an open-end wrench. Alternatively, however, it is also conceivable that the mounting tool is a two-hole wrench, a socket or another mounting tool that would appear useful to a skilled person. In particular, the mounting tool is designed to correspond to the mounting interface 24.

[0046] The mounting interface 24 has a hexagonal mounting contour 56, which is intended in particular to interact with the mounting tool. In this example, the mounting interface 24 has a width across flats of 27 mm. Alternatively, it is conceivable that the mounting interface 24 has a width across flats different from 27 mm. For example, it is also conceivable that the width across flats of the mounting interface 24 is in a range of between 17 mm and 30 mm, preferably at least 20 mm, preferably at least 24 mm and at most 30 mm. However, it is also conceivable that a width across flats of the mounting interface 24 is smaller than 17 mm or larger than 30 mm.

[0047] Alternatively, it is also conceivable that the mounting interface 24 has only two parallel or angled mounting surfaces, a square mounting contour or the like for interaction with the mounting tool. The mounting interface 24 is arranged on a side of the tool 12 facing the tool holder 14, preferably at least in an operating state. The mounting interface 24 is arranged on a side of the driver unit 18 remote from the fastening unit 20. The mounting interface 24 is arranged on the base body 50 of the driver unit 18. The mounting interface 24 is formed in one piece with the base body 50.

[0048] The driver unit 18 has several driver elements 26, four in this example, which are provided for a rotationally fixed connection with the fastening unit 20 and with the tool 12. Alternatively, however, it is conceivable that the driver unit 18 has a number of driver elements 26 different from four, for example only one driver element 26, two driver elements 26, three driver elements 26 or more than four driver elements 26. The driver elements 26 of the driver unit 18 are arranged uniformly, in particular around the axis of rotation 40 of the driver unit 18. The driver elements 26 of the driver unit 18 are arranged at a distance from one another.

[0049] Alternatively, it is conceivable that the driver elements 26 of the driver unit 18 are provided only for a rotationally fixed connection with the fastening unit 20 or the tool 12. Alternatively or additionally, it is conceivable that the driver unit 18 has at least one further driver element which is provided for torque transmission from the driver unit 18 to the fastening unit 20, in particular at least in a state of the driver unit 18 connected to the fastening unit 20, and/or to the tool 12, preferably at least in an operating state.

[0050] The driver elements 26 of the driver unit 18 are provided for torque transmission from the driver unit 18 to the tool 12, in particular at least in an operating state. The driver elements 26 of the driver unit 18 are provided for torque transmission from the driver unit 18 to the fastening unit 20, in particular at least in a state of the driver unit 18 connected to the fastening unit 20, preferably at least in an operating state. The driver elements 26 of the driver unit 18 are designed as positive locking elements, for example as a projection, a recess or the like. The driver elements 26 of the driver unit 18 are part of the positive locking unit 22. The positive locking unit 22 is arranged partly on the driver unit 18 and partly on the fastening unit 20. It is also conceivable that the driver elements 26 of the driver unit 18 are designed as latching elements, for example as latching recesses, latching hooks, latching lugs or the like.

[0051] The tool 12 has at least one driver element (not shown here) that corresponds in particular to the driver elements 26 of the driver unit 18. A number of driver elements 26 of the driver unit 18 preferably corresponds to a number of driver elements of the tool 12. Alternatively, however, it is also conceivable that a number of driver elements 26 of the driver unit 18 is different from a number of driver elements of the tool 12. It is conceivable that the at least one driver element of the tool 12 is part of the tool interface 52, in particular the tool hub, of the tool 12. The driver elements 26 of the driver unit 18 can be used to transmit torque from the driver unit 18, in particular the mounting interface 24, to the fastening unit 20, in particular for mounting or unmounting the machine tool device 10 on the tool holder 14. The driver elements 26 of the driver unit 18 are arranged on the base body 50 of the driver unit 18. The driver elements 26 of the driver unit 18 are formed in one piece with the base body 50.

[0052] The fastening unit 20 has several fastening elements 34, here exemplarily four, in particular corresponding to the driver elements 26 of the driver unit 18. A number of driver elements 34 of the fastening unit 20 preferably corresponds to a number of driver elements 26 of the driver unit 18 and/or a number of driver elements of the tool 12. Alternatively, however, it is also conceivable that a number of driver elements 34 of the fastening unit 20 is different from a number of driver elements of the tool 12 and/or of driver elements 26 of the driver unit 18. The driver elements 34 of the fastening unit 20 are formed in one piece with a fastening base body 60 of the fastening unit 20. The fastening element 62 of the fastening unit 20 is formed in one piece with the fastening base body 60. The driver elements 34 of the fastening unit 20 are part of the positive locking unit 22. The driver elements 34 of the fastening unit 20 are arranged uniformly, in particular around the axis of rotation 42 of the fastening unit 20. The driver elements 34 of the fastening unit 20 are arranged at a distance from one another.

[0053] The machine tool device 10 has at least the axial locking element 28, in particular an O-ring, for an axial locking of a connection of the fastening unit 20 to the driver unit 18, in particular one that can be released without tools. The axial locking element 28 is designed as a rubber-elastic O-ring. Alternatively, however, it is also conceivable that the fastening unit 20 and/or the driver unit 18 has at least one, preferably elastically deformable and/or deflectable, latching projection, latching recess or the like for axially locking a connection of the fastening unit 20 to the driver unit 18, which can be released, in particular without tools.

[0054] The axial locking element 28 is provided for a detachable axial locking of a connection of the fastening unit 20 to the driver unit 18 with respect to the axis of rotation 38 of the machine tool device 10, preferably the axis of rotation 40 of the driver unit 18 and/or the axis of rotation 42 of the fastening unit 20. The machine tool device 10 has only the one axial locking element 28. Alternatively, however, it is also conceivable that the machine tool device 10 has a plurality of axial locking elements 28 for releasable axial locking of a connection between the fastening unit 20 and the driver unit 18. The axial locking element 28 can be detachably fastened to the fastening unit 20, in particular to the fastening base body 60, in particular without tools. Alternatively, however, it is also conceivable that the axial locking element 28 can be detachably attached to the driver unit 18, in particular without tools.

[0055] The fastening unit 20 has a locking element holder 64, preferably a recess, for holding the at least one axial locking element 28. The axial locking element 28 is arranged on the locking element holder 64 in at least one operating state.

[0056] The driver unit 18 has a projection 66. The projection 66 is intended to cooperate with the axial locking element 28 to form a detachable axial locking of a connection between the fastening unit 20 and the driver unit 18.

[0057] Alternatively, however, it is also conceivable that the driver unit 18 has a locking element holder for holding the at least one axial locking element 28. Furthermore, it is alternatively conceivable that the axial locking element 28 is formed in one piece with the driver unit 18 or the fastening unit 20, in particular at least a part of the driver unit 18, preferably the base body 50, or at least a part of the fastening unit 20, preferably the fastening base body 60 of the fastening unit 20. Alternatively, it is also conceivable that the machine tool device 10 is free of an axial locking element 28. The driver unit 18 and the fastening unit 20 have a fit to each other that functions according to the poka-yoke principle.

[0058] The driver unit 18 and the fastening unit 20 are designed in one piece. The machine tool device 10 has only three, in particular one-piece, components, in particular the fastening unit 20, the driver unit 18 and the axial locking element 28. Alternatively, it is also conceivable that the machine tool device 10 has only two components, in particular the driver unit 18 and the fastening unit 20. However, it is also conceivable that the machine tool device 10 has more than three components.