Tool Holding Device, Machine Tool, Machine Tool System, and Tool Means

Abstract

A tool receiving device for an arrangement of at least one tool mechanism, in particular of at least one tool disc, on a portable machine tool, in particular on an angle grinder is disclosed. The tool receiving device has (i) at least one receiving unit on which the at least one tool mechanism can be fixed, and (ii) at least one retaining unit particularly rotatably supported on the receiving unit for at least axially fixing the receiving unit, in particular the tool mechanism, on an output unit. The receiving unit includes at least one driver element and at least one mounting element which are rotatably connectable to each other by the retaining unit. The retaining unit includes at least one retaining element which is configured for a screw connection to the output unit.

Claims

1. A tool receiving device for an arrangement of at least one tool mechanism on a portable machine tool, comprising: at least one receiving unit, on which the at least one tool mechanism can be fixed, and at least one retaining unit rotatably supported on the receiving unit and configured to at least axially fix the tool mechanism on an output unit, wherein the at least one receiving unit comprises at least one driver element and at least one mounting element which are rotatably connectable to each other with respect to each other by the at least one retaining unit, and wherein the at least one retaining unit comprises at least one retaining element implemented as a screw connection to the output unit.

2. The tool receiving device according to claim 1, wherein: the output unit is (i) configured to be connected to the machine tool, and (ii) captively connected to the at least one receiving unit and to the at least one retaining unit.

3. The tool receiving device according to claim 2, wherein the output unit is captively connected to the at least one receiving unit and to the at least one retaining unit by at least one connecting element which is configured differently from the at least one driver element.

4. The tool receiving device according to claim 2, wherein the output unit is formed integrally with the at least one driver element.

5. The tool receiving device according to claim 1, wherein the at least one retaining unit comprises at least one actuating element pivotally connected to the at least one retaining element relative to the at least one retaining element.

6. The tool receiving device according to claim 1, wherein the at least one retaining element is configured to form a rotary driving surface for the at least one mounting element for rotating the at least one mounting element when the at least one retaining element is rotated.

7. The tool receiving device according to claim 5, wherein the at least one retaining element and the at least one actuating element are pivotally connected to each other about a pivot axis, which is arranged outside of an axis of rotation of the at least one retaining element.

8. The tool receiving device according to claim 1, wherein the at least one driver element is configured to form at least two stops for the at least one mounting element that limit a rotatability of the mounting element relative to the driver element to an angle of a maximum of 45.

9. The tool receiving device according to claim 1, wherein a rotatability of the at least one retaining element is limited to an angle of a maximum of 520.

10. The tool receiving device according to claim 1, wherein the at least one retaining unit is configured to form a screw head end which has a maximum diameter about an axis of rotation of the at least one retaining element which is less than a maximum diameter of the at least one mounting element about the axis of rotation.

11. The tool receiving device according to claim 1, wherein the at least one retaining element comprises a thread which has a thread pitch of at least 0.6 mm.

12. The tool receiving device according to claim 1, wherein the at least one retaining element comprises a thread which has a maximum thread diameter of at least 5.8 mm.

13. The tool receiving device according to claim 3, wherein the at least one actuating element is at least partially made of plastic.

14. A machine tool having a tool receiving device according to claim 1.

15. A machine tool system, comprising: a machine tool, at least one tool mechanism, and a tool receiving device according to claim 1, wherein the at least one retaining unit is configured to form a screw head end, which has a maximum diameter about an axis of rotation of the retaining element, which is less than a minimum diameter of a connection opening of the at least one tool mechanism about the axis of rotation.

16. A tool mechanism for a machine tool system according to claim 15.

17. The tool receiving device according to claim 1, wherein the at least one tool mechanism is at least one tool disc.

18. The tool receiving device according to claim 1, wherein the portable machine tool is an angle grinder.

19. The tool receiving device according to claim 1, wherein the at least one driver element is configured to form at least two stops for the at least one mounting element that limit a rotatability of the mounting element relative to the driver element to an angle of a maximum of 42.

20. The tool receiving device according to claim 1, wherein a rotatability of the at least one retaining element is limited to an angle of a maximum of 504.

Description

DRAWINGS

[0027] Further advantages follow from the description of the drawings hereinafter. The drawings illustrate two exemplary embodiments of the invention. The drawings, the description, and the claims contain numerous features in combination. The person skilled in the art will appropriately also consider the features individually and combine them into additional advantageous combinations.

[0028] The figures show:

[0029] FIG. 1 a machine tool system according to the invention having a machine tool according to the invention, having a tool receiving device according to the invention, and having a tool means according to the invention in a schematic cross-sectional view,

[0030] FIG. 2 the tool receiving device according to the invention in a schematic cross-sectional view,

[0031] FIG. 3 a driver element of the tool receiving device according to the invention in a schematic diagram,

[0032] FIG. 4 the tool receiving device according to the invention in a schematic cross-sectional view,

[0033] FIG. 5 the tool receiving device according to the invention in a schematic view,

[0034] FIG. 6 an alternative tool receiving device according to the invention in a schematic cross-sectional view.

DESCRIPTION OF THE DESIGN EXAMPLES

[0035] FIG. 1 shows a machine tool system 700a. The machine tool system 700a comprises a machine tool 500a. The machine tool system 700a comprises a tool means 400a. The machine tool system 700a comprises a tool receiving device 10a.

[0036] The machine tool 500a is implemented as an angle grinder. The machine tool 500a comprises a housing 502a . . . . The machine tool system 700a comprises a guard 702a for tool means 400a, which is configured as an optional add-on part for the machine tool 500a separate from the housing 502a. The guard 702a is configured to partially enclose the tool means 400a on the machine tool 500a, particularly in a state of the guard 702a coupled to the machine tool 500a. The machine tool 500a comprises an output receiving opening 506a for receiving an output unit 16a. The output receiving opening 506a is configured to connect to the output unit 16a. The machine tool 500a has a longitudinal axis 504a.

[0037] The tool receptacle 10a is configured as an arrangement of a tool means 400a, in particular a tool disc, for example a cutting disc, on the portable machine tool 500a, in particular on the angular grinder.

[0038] The tool receiving device 10a comprises a receiving unit 12a. The tool receiving device 10a comprises a retaining unit 14a. The tool means 400a can be fixed to the receiving unit 12a. The retaining unit 14a is rotatably supported on the receiving unit 12a. The retaining unit 14a is configured to axially fix the receiving unit 12a and the tool means 400a to the output unit 16a.

[0039] The tool receiving device 10a is partially a sub-assembly of an output gear box 508a of the machine tool 500a, and partially a tool receiving device of the machine tool 500a, in particular as a combined unit for the machine tool 500a. The tool receiving device 10a is provided for use on the machine tool 500a. The tool receiving device 10a is provided to be captively connected to the machine tool 500a, in particular to be partially integrated into the machine tool 500a. The tool receiving device 10a is captively connected to machine tool 500a, in particular partially integrated in the machine tool 500a.

[0040] The tool receiving device 10a is provided, particularly as a sub-assembly of the machine tool 500a, for coupling the tool means 400a, particularly a plurality of different tool means, in particular tool means 400a, to a motor (not shown) of the machine tool 500a via the output gear box 508a. The tool receiving device 10a is provided for disposing tool means 400a on the portable machine tool 500a.

[0041] The receiving unit 12a comprises a driver element 18a (cf. FIG. 2). The receiving unit 12a comprises a mounting element 20a. The mounting element 20a is rotatable relative to the driver element 18a. The driver element 18a is connected to the mounting element 20a by the retaining unit 14a. The retaining element 20a is rotatably connected to the mounting element 20a by the retaining unit 14a relative to the driver element 18a. The retaining unit 14a comprises a retaining element 22a. The retaining element 22a is configured for a screw connection to the output unit 16a.

[0042] The receiving unit 12a is provided for an arrangement mostly outside of the machine tool 500a, particularly outside of the housing 502a of the machine tool 500a. The receiving unit 12a is provided to clamp the tool means 400a outside of the machine tool 500a, particularly by rotating components of the receiving unit 12a relative to each other. The receptacle 12a is provided for an arrangement at least mostly outside of a smallest imaginary cuboid 510a about the machine tool 500a.

[0043] The tool means 400a can be fixed between the driver element 18a and the retaining element 20a by rotating the mounting element 20a relative to the driver element 18a.

[0044] The driver element 18a can be connected, in particular is connected, to the tool machine 500a, in particular in a non-displaceable manner along an axis of rotation 24a of the retaining unit 14a, in particular of the tool means 400a and/or the output unit 16a.

[0045] The retaining element 20a is rotatably connected to the machine tool 500a about the axis of rotation 24a, in particular by a limited angle, in particular on the driver element 18a. The driver element 18a is implemented as a hollow cylinder disc. The driver element 18a materially extends radially from an inner driver radius 26a, particularly other than zero, to an outer driver radius 28a, wherein the driver element 18a has a maximum extent, in particular along the axis of rotation 24a, which is in particular shorter than a maximum extent of the driver element 18a perpendicular to the axis of rotation 24a, and wherein the driver element 18a comprises recesses in particular between the inner driver radius 26a and the outer driver radius 28a, which are completely bounded in a plane perpendicular to the axis of rotation 24a by the material extents of the driver element 18a.

[0046] The driver element 18a mounds a central recess 30a on the inner driver radius 26a, preferably symmetrical about the axis of rotation 24a, in particular to a circular shape in a cross section perpendicular to the axis of rotation 24a (cf. FIG. 3). The driver element 18a comprises four protrusion stop elements 32a, 32a, 32a, 32a between the inner driver radius 26a and the outer driver radius 28a.

[0047] The protrusion stop elements 32a, 32a, 32a, 32a extend partially along the axis of rotation 24a. The protrusion stop elements 32a, 32a, 32a, 32a are all identical. The protrusion stop elements 32a, 32a, 32a, 32a are all equally spaced apart from the nearest adjacent protrusion stop elements 32a, 32a, 32a, 32a. The protrusion stop elements 32a, 32a, 32a, 32a are collectively disposed rotationally symmetrically about the axis of rotation 24a.

[0048] All protrusion stop elements 32a, 32a, 32a, 32a are disposed on a same base side 34a of the driver element 18a. A base side 34a, 34a of the driver element 18a is a largest outer side disposed in particular facing hypothetical ends of the axis of rotation 24a. The base side 34a of the driver element 18a facing away from the projection stop elements 32a, 32a, 32a, 32a, is at least substantially flat in design, particularly except for a rim 36a projecting along the axis of rotation 24a out of a plane of the base side 34a. The mounting element 20a is implemented as a hollow cylinder disc. The mounting element 20a extends materially radially from an inner mounting radius 38a, in particular other than zero, to an outer mounting radius 40a, wherein the mounting element 20a has a maximum extent, in particular along the axis of rotation 24a, which is in particular shorter than a maximum extent of the mounting element 20a perpendicular to the axis of rotation 24a, and wherein the mounting element 20a comprises recesses in particular between the inner mounting radius 38a and the outer mounting radius 40a, which are at least partially bounded in a plane perpendicular to the axis of rotation 24a by the material extents of the mounting element 20a.

[0049] The inner mounting radius 38a is the same size as the inner driver radius 26a. The driver element 18a and the mounting element 20a are connected to each other by the retaining unit 14a partially rotatably about the axis of rotation 24a.

[0050] The mounting element 20a is configured as a hollow cylinder disc having wing elements 42a, 42a, 42a, 42a (cf. FIG. 4). The mounting element 20a is configured from the inner mounting radius 38a to an intermediate mounting radius 44a as a circular and symmetrical hollow cylinder disc, and between the intermediate mounting radius 44a and the outer mounting radius 40a as wing elements 42a, 42a, 42a, 42a adjacent to the circular and symmetrical hollow cylinder disc (cf. FIG. 5). The wing elements 42a, 42a, 42a, 42a define the outer mounting radius 40a for the mounting element 20a. The outer driver radius 28a is implemented as greater than the outer mounting radius 40a by more than 25% of the outer mounting radius 40a.

[0051] The mounting element 20a is formed in part by four wing elements 42a, 42a, 42a, 42a. The wing elements 42a, 42a, 42a, 42a form protrusions in the radial direction with respect to the axis of rotation 24a. The wing elements 42a, 42a, 42a, 42a, when viewed along the axis of rotation 24a, have a boot shape, in particular without a heel. The mounting element 20a is configured as a star knob. The mounting element 20a is made of the same material as the driver element 18a. The mounting element 20a is made of a metal material. The driver element 18a is made of a metal material.

[0052] The mounting element 20a and the driver element 18a are configured to clamp the tool means 400a by way of an axial displacement, particularly along the axis of rotation 24a, of the mounting element 20a relative to driver element 18a, particularly to fix the tool means 400a to the tool receiving device 10a, particularly to the machine tool 500a. In the present example, the mounting element 20a is supported relative to the driver element 18a axially displaceably by a maximum of 0.12 mm, in particular along the axis of rotation 24a.

[0053] The wing elements 42a, 42a, 42a, 42a of the mounting element 20a and the protrusion stop elements 32a, 32a, 32a, 32a of the driver element 18a are configured to clamp the tool means 400a, in particular to fix the tool means 400a to the tool receiving device 10a, in particular to the machine tool 500a.

[0054] The wing elements 42a, 42a, 42a, 42a of the mounting element 20a and the projection stop elements 32a, 32a, 32a, 32a of the driver element 18a each have approximately equally sized clamping surfaces, which are configured to flatly clamp the tool means 400a, preferably to fix the tool means 400a to the tool holder 10, in particular to the machine tool 500a

[0055] The clamping surfaces are configured as surfaces of the mounting element 20a and the driver element 18a, which have a surface normal aligned parallel to the axis of rotation 24a, in particular for aligning the tool means 400a with a diameter of the tool means 400a perpendicular to the axis of rotation 24a, in particular free of any imbalance with respect to rotating about the axis of rotation 24a.

[0056] The retaining element 22a is made of a metal material. The retaining element 22a is made of the same material as the driver element 18a and/or the mounting element 20a. The retaining element 22a is configured as a clamping screw.

[0057] The retaining element 22a is configured to axially fix the tool means 400a by means of the mounting element 20a to the receiving unit 12a, in particular to the tool receiving device 10a, in particular to the machine tool 500a, in particular with respect to the axis of rotation 24a.

[0058] The retaining element 22a is configured to axially fix the mounting element 20a to the receiving unit 12a, in particular to the tool receiving device 10a, in particular to the machine tool 500a, in particular with respect to the axis of rotation 24a. The retaining element 22a is configured as a, preferably elongate, cylindrical element. The retaining element 22a is configured as a, preferably elongate, screw cylinder element. The retaining element 22a has a longitudinal axis 46a aligned parallel to the axis of rotation 24a.

[0059] The retaining element 22a has a thread 48a. The thread 48a is disposed on the retaining element 22a in a half region, in particular the end region, of a longitudinal extent of the retaining element 22a. The thread 48a is disposed on the retaining element 22a in a half region, in particular the end region, of a longitudinal extent of the retaining element 22a facing toward the output unit 16a, in particular the machine tool 500a.

[0060] The retaining element 22a has an approximately T-shaped outer contour in a cross-section along the axis of rotation 24a through the axis of rotation 24a, wherein a T cross-beam has in particular unequal extents away from a T longitudinal beam. The retaining element 22a has an at least substantially L-shaped outer contour in a cross-section along the axis of rotation 24a through the axis of rotation 24a, wherein an L cross-beam in particular has an extent beyond an L longitudinal beam, wherein in particular the extent of the L-cross-beam beyond the L longitudinal beam is at most 25% of an extent of the L cross-beam.

[0061] The retaining element 22a is rotatably supported on the receiving unit 12a relative to the driver element 18a. The retaining element 22a is partially, in particular at certain angles of rotation, rotatably mounted to the receiving unit 12a relative to the mounting element 20a. The retaining element 22a is captively connected to the output unit 16a. The receiving unit 12a is captively connected to the output unit 16a by the retaining element 22a, among other things. The receiving unit 12a is captively connected to the output unit 16a by screw elements, among other things.

[0062] The retaining element 22a is implemented by thread 48a as a screw connection to the output unit 16a. The screw connection between the retaining element 22a and the output unit 16a is to enable a controllable axial displacement of the retaining element 22a relative to the output unit 16a, in particular by rotation of the retaining element 22a, in particular measured by a rotational distance at an outer retaining radius 50a of the retaining element 22a, reduced by a factor of at least one hundred. An axial displacement of the retaining element 22a is limited in design by a rotation of the retaining element 22a about the axis of rotation 24a.

[0063] In the present example, the retaining element 22a is connected to the output unit 16a by the screw connection axially displaceably by a maximum of 0.31 mm. In the present example, the retaining element 22a is connected to the output unit 16a by the screw connection axially displaceably by at least 0.24 mm.

[0064] The receiving unit 12a comprises a spring element 52a configured as a spiral spring element. The spring element 52a is disposed between driver element 18a and mounting element 20a. The spring element 52a is configured to apply a force to the mounting element 20a toward the driver element 18a. The spring element 52a is connected to the mounting element 20a. The spring element 52a is connected to the driver element 18a.

[0065] The spring element 52a is disposed about the axis of rotation 24a, in particular centered. The retaining element 22a is not removable from the output unit 16a by rotation about the axis of rotation 24a, in particular by the screw connection. In the present example, the retaining element 22a is connected to the output unit 16a axially displaceably by a maximum of 0.17 mm, by a rotation of the retaining element 22a by 58.

[0066] The retaining element 22a has an axial stop surface 54a to limit axial displacement towards the output unit 16a, in particular the machine tool 500a. The axial stop surface 54a is disposed in a half region, in particular the end region, of a longitudinal extent of the retaining element 22a, in particular a half region, in particular the end region, facing away from the output unit 16a, in particular the machine tool 500a.

[0067] The retaining element 22a has a taper 64a, in particular with respect to a diameter of the retaining element 22a, in the half region, in particular the end region, of a longitudinal extent of the retaining element 22a facing toward the output unit 16a, in particular the machine tool 500a. The taper 64a is disposed directly adjacent to the thread 48a, particularly on a side facing toward the mounting element 20a. The taper 64a is disposed at a geometrical center of the retaining element 22a, particularly with respect to a longitudinal extent of the retaining element 22a. The taper 64a is disposed between the thread 48a and the geometrical center of the retaining element 22a, particularly with respect to a longitudinal extent of the retaining element 22a.

[0068] The tool receiving device 10a comprises the output unit 16a. The output unit 16a is configured to connect to the machine tool 500a. The output unit 16a is captively connected to the receiving unit 12a and to the retaining unit 14a. The output unit 16a is made at least mostly, in particular entirely of a metal material. The output unit 16a has a symmetrical outer contour in a cross section along the axis of rotation 24a through the axis of rotation 24a. The output unit 16a comprises a tool end 70a configured to connect to the machine tool 500a. The tool end 70a is an end of an extent of the output unit 16a along the longitudinal axis 68a of the output unit 16a, which is disposed on a side facing away from an output coupling opening 66a.

[0069] The output unit 16a comprises the output coupling opening 66a. The output coupling opening 66a is configured to at least partially receive the retaining element 22a. The output coupling opening 66a is configured to form a connection, in particular a screw connection, with the retaining element 22a. The output unit 16a has a longitudinal axis 68a oriented parallel to the axis of rotation 24a, in particular defining the axis of rotation 24a.

[0070] The output coupling opening 66a has a tip 56a, in particular a tapered tip 56a, at the end of the tool end 70a, particularly in a half region facing the machine tool 500a, particularly the end region, of the longitudinal extent of the output coupling opening 66a. The particularly tapered tip 56a has a maximum tip diameter 58a, which is at least 20% less than a maximum thread diameter 60a, in particular a diameter of the retaining element 22a at the thread 48a of the retaining element 22a. The particularly tapered tip 56a has a maximum tip diameter 58a, which is at least 20% less than a least outer diameter of the retaining element 22a between the thread 48a and an actuating element 62a. The particularly tapered tip 56a has a maximum tip diameter 58a, which is at least 20% less than double the inner driver radius 26a and/or double the inner mounting radius 38a. The particularly tapered tip 56a has a maximum extent along the axis of rotation 24a, which is less than, in particular at most half as great as, the maximum tip diameter 58a of the particularly tapered tip 56a.

[0071] The longitudinal axis 68a of the output unit 16a is an axis of symmetry of the output unit 16a about which the output unit 16a, in particular the outer contour of the output unit 16a, is formed rotationally symmetrically. The output unit 16a is configured to captively connect to the machine tool 500a.

[0072] The output unit 16a is disposed at least substantially entirely in the machine tool 500a, particularly in the housing 502a of the machine tool 500a, preferably in the smallest imaginary cuboid 510a about the machine tool 500a.

[0073] The output unit 16a is configured to be disposed on the machine tool 500a having the output coupling opening 66a facing outward, particularly with respect to the housing 502a of the machine tool 500a. The output unit 16a is configured to couple with the motor of the machine tool 500a, in particular to transfer a torque from the motor to the tool means 400a. The output unit 16a is configured entirely as an output shaft, which is configured in particular to be preferably fully rotatably supported on the machine tool 500a.

[0074] The retaining element 22a comprises a groove 72a, which preferably extends circumferentially around the retaining element 22a at least once. The output unit 16a has an internal thread 74a corresponding to the thread 48a of the retaining element 22a for a screw connection with the retaining element 22a. The internal thread 74a is disposed in the output coupling opening 66a. A depth 96a of the output coupling opening 66a limits an axial mobility, particularly displaceability, of the retaining element 22a, preferably relative to the axis of rotation 24a, in a direction towards the output unit 16a.

[0075] The tool receiving device 10a, in particular the output unit 16a, the receiving unit 12a, and the retaining unit 14a together have a maximum extent 76a along the axis of rotation 24a, which is a maximum of 45 mm (cf. FIG. 2).

[0076] The output unit 16a comprises at least one connecting element 78a, in particular the connecting ring. The output unit 16a is captively connected to the receiving unit 12a and to the retaining unit 14a by the connecting element 78a, which is in particular different from the driver element 18a. The connecting element 78a, particularly the connecting ring, is disposed at least partially in the groove 72a of the retaining element 22a, particularly on an inner side of the connecting element 78a relative to the axis of rotation 24a. The connecting element 78a extends circumferentially, particularly with respect to the axis of rotation 24a, once entirely about the axis of rotation 24a, particularly about the retaining element 22a. The coupler 78a has a maximum extent along the axis of rotation 24a, which is shorter than a maximum extent to which the groove 72a is limited along the axis of rotation 24a. The connecting element 78a is non-displaceably connected to the output unit 16a, particularly relative to the output unit 16a. The connecting element 78a is fixedly connected to the driver element 18a. The connecting element 78a limits an axial mobility, in particular displaceability, particularly with respect to the axis of rotation 24a, of the retaining element 22a in a direction away from the output unit 16a, particularly by means of the groove 72a of the retaining element 22a.

[0077] The retaining unit 14a comprises the actuating element 62a. The actuating element 62a is pivotally connected to retaining element 22a relative to the retaining element 22a. The actuating element 62a is configured to form the retaining element 22a to be manually rotatable, in particular without any tools. The actuating element 62a is pivotally connected to the retaining element 22a about a pivot axis 80a relative to the retaining element 22a, which is aligned perpendicular to the axis of rotation 24a. The actuating element 62a is configured to be pivotable by a maximum of 100 with respect to the retaining element 22a. The actuating element 62a is configured as a semicircular arc element (cf. FIG. 4 and FIG. 5). The actuating element 62a defines a maximum diameter 94a of the retaining unit 14a about the axis of rotation 24a.

[0078] The retaining element 22a and the actuating element 62a are pivotally connected to each other about the pivot axis 80a, which is disposed outside of an axis of rotation 24a of the retaining element 22a. The actuating element 62a is pivotally connected to retaining element 22a by two bolt elements, in particular pin elements or dowel elements. The actuating element 62a is connected to the retaining element 22a at ends along the longitudinal extent of the actuating element 62a. The pivot axis 80a is oriented perpendicular to the axis of rotation 24a. The pivot axis 80a and the axis of rotation 24a are disposed skew to each other, in particular non-parallel and without any intersection point.

[0079] The retaining element 22a forms a rotary driving surface 82a for the mounting element 20a to rotate the mounting element 20a upon rotating of the retaining element 22a. The retaining element 22a and the mounting element 20a lie directly adjacent to one another in a half region, in particular in an end region, in particular in a half region facing away from the output unit 16a, in particular the end region, of the longitudinal extent of the retaining element 22a, to form a friction fit at the rotary driving surface 82a. The rotary driving surface 82a is limited to a mushroom-shaped outer contour, in particular a compound shape made of wide stem and a rounded hat shape, in particular at least in a cross section perpendicular to the axis of rotation 24a (cf. FIG. 4).

[0080] The rotary driving surface 82a is an outer surface of the retaining element 22a oriented perpendicular to the axis of rotation 24a in the direction of the retaining element 20a. The rotary driving surface 82a of the retaining element 22a is oriented perpendicular to the axis of rotation 24a. The rotary driving surface 82a of the retaining element 22a is configured, in particular disposed, to directly contact the mounting element 20a at certain angles of rotation of the retaining element 22a. The rotary driving surface 82a is identical to the axial stop surface 54a of retaining element 22a.

[0081] The driver element 18a forms eight stops for the mounting element 20a (cf. FIG. 3). The stops limit a rotatability of the retaining element 20a relative to the driver element 18a to a maximum angle of 42. The protrusion stop elements 32a, 32a, 32a, 32a of the driver element 18a form the eight stops for the retaining element 20a, which limit a rotatability of the retaining element 20a relative to the driver element 18a to a maximum angle of 42.

[0082] Preferably, respective front faces 84a, 84a, 84a, 84a and rear faces 86a, 86a, 86a, 86a of the projection stop elements 32a, 32a, 32a, 32a of the driver element 18a form the eight stops for the mounting element 20a, in particular limiting a rotatability of the mounting element 20a relative to the driver element 18a to a maximum angle of 42 into the circumferential direction about the axis of rotation 24a.

[0083] The protrusion stop elements 32a, 32a, 32a, 32a each have a plateau surface 88a, 88a, 88a, 88a, which have surface normals parallel to the axis of rotation 24a.

[0084] Respective front faces 84a, 84a, 84a, 84a of the projection stop elements 32a, 32a, 32a, 32a of the driver element 18a facing plateau surfaces 88a, 88a, 88a, 88a relative to the circumferential direction about the axis of rotation 24a form four stops for the retaining element 20a for limiting a rotatability of the mounting element 20a counterclockwise relative to the driver 18a to a maximum angle of 42.

[0085] Respective rear faces 86a, 86a, 86a, 86a of the projection stop elements 32a, 32a, 32a, 32a of the driver element 18a facing away from the plateau surfaces 88a, 88a, 88a, 88a relative to the circumferential direction about the axis of rotation 24a form four stops for the mounting element 20a, limiting a rotatability of the mounting element 20a counterclockwise relative to the driver element 18a to a maximum angle of 42.

[0086] The driver element 18a forms four intermediate spaces 90a, 90a, 90a, 90a particularly in the circumferential direction, between eight stops, particularly between the projection stop elements 32a, 32a, 32a, 32a, for the mounting element 20a, which allow the mounting element 20a to be rotated relative to the driver element 18a by an angle of at least 30.

[0087] The rotatability of the mounting element 20a counterclockwise relative to the driver element 18a is limited to a rotation of the wing elements 42a, 42a, 42a, 42a from one intermediate space 90a, 90a, 90a, 90a between two protrusion stop elements 32a, 32a, 32a, 32a, particularly in the circumferential direction, over the plateau surfaces 88a, 88a, 88a, 88a.

[0088] The rotatability of the retaining element 20a clockwise relative to the driver element 18a is limited to a rotation of the wing elements 42a, 42a, 42a, 42a from over each of the plateau surfaces 88a, 88a, 88a, 88a into the intermediate spaces 90a, 90a, 90a, 90a between four protrusion stop elements 32a, 32a, 32a, 32a, particularly in the circumferential direction, in particular entirely adjacent to the plateau surface 88a, 88a, 88a, 88a.

[0089] The rotatability of the retaining element 22a is limited to a maximum angle of 100. The rotatability of the retaining element 22a is limited by an axial displaceability of the retaining element 22a to a maximum angle of 100, in particular in the present example.

[0090] The rotatability of the retaining element 22a is limited clockwise by an axial displaceability towards the output unit 16a of the retaining element 22a by the output unit 16a and by the groove 72a interacting with the connecting element 78a, in particular to a maximum angle of 100.

[0091] The rotatability of the retaining element 22a is limited counterclockwise by an axial displaceability away from the output unit 16a of the retaining element 22a by the groove 72a interacting with the connecting element 78a, in particular to a maximum angle of 100.

[0092] The rotatability of the retaining element 22a is limited to an angle which is at least as great, preferably at least twice as great as a maximum angle of a rotatability of the mounting element 20a compared to the at least one driver element 18a.

[0093] The rotatability of the retaining element 22a is limited to an angle of at least 85.

[0094] The retaining unit 14a forms a screw head end 92a. The screw head end 92a has a maximum diameter 94a about an axis of rotation 24a of the retaining element 22a, which is less than a maximum diameter of the mounting element 20a, in particular as the double outer mounting radius 40a, about the axis of rotation 24a (cf. FIG. 1 and FIG. 4).

[0095] The actuating element 62a and the retaining element 22a form the screw head end 92a on an end of the retaining unit 14a facing away from the output unit 16a having a circular outer contour apart from two smaller gaps in a cross section perpendicular to the axis of rotation 24a, in particular in a non-pivoted state of the actuating element 62a (cf. FIG. 4), in particular in a state in which the actuating element 62a abuts the retaining element 20a on a flat surface.

[0096] The screw head end 92a has a maximum diameter 94a about the axis of rotation 24a of the retaining element 22a, which is greater than double the intermediate mounting radius 44a, in particular of the mounting element 20a about the axis of rotation 24a.

[0097] The retaining element 22a comprises a thread 48a, which has a thread pitch of at least 0.6 mm. The thread 48a of the retaining element 22a has a thread pitch of between 0.6 mm and 2 mm. The thread 48a of the retaining element 22a has a thread pitch of 1.0 mm.

[0098] The thread 48a has a maximum thread diameter 60a of at least 5.8 mm. The thread 48a has a maximum thread diameter 60a of at least 10 mm.

[0099] The screw head end 92a has a maximum diameter 94a about the axis of rotation 24a of the retaining element 22a, which is less than a minimum diameter 402a of a connecting opening 404a of the tool means 400a about the axis of rotation 24a (cf. FIG. 2). The tool means 400a is configured specifically for the machine tool system 700a.

[0100] The tool means 400a has the connection opening 404a which has a minimum diameter 402a which is greater than a maximum diameter 94a of the screw head end 92a of the retaining unit 14a.

[0101] FIG. 6 shows another exemplary embodiment of the invention. The following descriptions and the drawings are substantially limited to the differences between the exemplary embodiments, whereby, with respect to identically designated components, in particular with respect to components having the same reference characters, reference can in principle also be made to the drawings and/or the description of the other exemplary embodiments, in particular in FIGS. 1 to 5. In order to distinguish between the exemplary embodiments, the letter a is appended to the reference characters for the exemplary embodiment in FIGS. 1 to 5. In the exemplary embodiments shown in FIG. 6, the letter a is replaced by the letter b.

[0102] FIG. 6 shows an alternative machine tool system 700b. The machine tool system 700b comprises an alternative machine tool 500b. The machine tool system 700b comprises a tool means 400b. The tool means 400b is identical to the tool means 400a from the previous example. The machine tool system 700b comprises an alternative tool receiving device 10b.

[0103] An output unit 16b is formed integrally with a driver element 18b. The tool receiving device 10b, in particular the output unit 16b, a receiving unit 12b and a retaining unit 14b together, in a state connected to each other, have a maximum extent 76b along a axis of rotation 24b of a maximum of 40 mm.

[0104] An actuating element 62b is made of plastic. The actuating element 62b is integrally formed with a retaining element 22b. The retaining element 22b is made at least partially of plastic on a screw head end 92b. The actuating element 62b is fixedly connected to the retaining element 22b, in particular relative to the retaining element 22b.