Adapter device and machine tool system with said adapter device

Abstract

The invention relates to a machine tool having an adapter device (10a; 10b) for fastening a machine tool accessory (12a; 12b) to a tool holder (16a; 16b), different in design to a fastening interface (14a; 14b) of the machine tool accessory (12a; 12b), on a machine tool (18a; 18b), particularly a portable machine tool, particularly an angle grinder, having at least one interface unit (20a; 20b), which has at least one interface (22a; 22b), which is associated with the tool holder (16a; 16b) and more particularly differs in design from a thread, for an interlocking and / or non-rotating connection to the tool holder (16a; 16b), and at least one further interface (24a; 24b), which is associated with the machine tool accessory (12a; 12b) and more particularly is designed as a threaded bolt, for an interlocking and / or non-rotating connection to the fastening interface (14a; 14b) of the machine tool accessory (12a; 12b).

Description

State of the art

[0001] An adapter device for attaching a machine tool accessory to a tool holder of a machine tool, in particular a portable machine tool, especially an angle grinder, with at least one interface unit is already known. Disclosure of the invention

[0002] The invention proposes an adapter device as defined in claim 1.

[0003] The machine tool accessory can be designed as an insert tool or as other machine tool accessory that a person skilled in the art would deem useful. The machine tool accessory can, for example, be a grinding wheel, a cutting disc, a round brush, a cup brush, or the like. The mounting interface of the machine tool accessory can be defined, in particular, by a through-hole, especially around a center point of the machine tool accessory, which is particularly disc-shaped. The mounting interface of the machine tool accessory is designed, in particular, for a force-fit and / or form-fit connection with a tool holder, especially the tool holder of the machine tool, or the interface unit. The tool holder of the machine tool is preferably designed differently from a threaded spindle.Preferably, the tool holder is designed as at least one movable hook jaw of a clamping device of a quick-release clamping system of the machine tool and is axially fixed to an output unit. Preferably, the interface unit comprises at least two elements, either separate or formed as a single piece, by means of which the machine tool accessory can be connected to the tool holder and by means of which forces and / or torques can be transmitted from an output, in particular an output of the tool holder of the machine tool, to the machine tool accessory. In particular, the elements of the interface unit differ from one another in their design, function, and / or connection. The interface associated with the tool holder is advantageously designed as a planar interface.Preferably, the interface defines an X-shaped recess in the interface unit, which is designed to receive and interact with the tool holder. The interface is designed for an axial connection and a rotationally secure connection with the tool holder. The interface is preferably designed to at least partially receive the tool holder of a machine tool. The interface particularly includes clamping wings that define the X-shaped recess. The interface preferably includes four clamping wings, which are designed to form a clamping surface and / or a drive surface for the tool holder of the machine tool. The tool holder of the machine tool can, in particular, engage beneath the clamping wings.Preferably, the cross-section of the clamping wing, which is defined by an orthogonal plane of the tool's axis of rotation, can be substantially trapezoidal, and in particular substantially rectangular. The four radially arranged clamping wings of the interface preferably define the recess in an X-shape. A maximum main extent of the interface, in particular of the X-shaped recess, along a direction extending at least substantially perpendicular to a longitudinal axis of the interface unit, is in particular smaller than a further maximum main extent of an axially deeper radial recess. The further interface is preferably designed as a threaded bolt. The further interface is in particular intended to transmit a torque to the machine tool accessory arranged at the further interface.Preferably, the machine tool accessory is axially clamped at the further interface by means of a clamping unit of the adapter device. The clamping unit preferably comprises at least one clamping nut or clamping flange for screwing onto or off the further interface, which is defined in particular as a threaded bolt, and which is intended to clamp the machine tool accessory axially against the interface unit.

[0004] The inventive design of the adapter device enables advantageously simple and safe use of a machine tool, in particular an angle grinder, with a mounting interface for a machine tool accessory and a machine tool accessory with a mounting interface that differs from the tool holder of the machine tool.

[0005] Furthermore, at least one anti-slip device is proposed, designed to prevent the unintentional loosening of the connection between the machine tool accessory and the additional interface, in particular the machine tool accessory slipping off the additional interface, which is designed as a threaded bolt. The anti-slip device is preferably formed at least partially integrally with the interface unit. The anti-slip device can, in particular, be completely separate from the interface unit, and especially at least partially integrated with a clamping unit, which may be different from the interface unit. In an alternative embodiment, the anti-slip device is formed separately from the interface unit and integrally with a clamping unit.The anti-slip device is specifically designed to limit relative movement between the machine tool accessory, the adapter device, and a clamping nut used to secure the machine tool accessory to the interface unit during braking, particularly due to the inertia of the machine tool accessory. Specifically, the anti-slip device is designed to prevent the clamping nut from loosening during braking, when the machine tool accessory tightens automatically, primarily due to its inertia causing a slight rotation. The anti-slip device advantageously prevents the clamping nut from slipping off the interface unit and thus prevents the machine tool accessory from detaching from the interface unit.Furthermore, increased flexibility and / or safety can be advantageously provided. "Intended" is understood to mean, in particular, specially designed and / or specially equipped. The fact that an object is intended for a specific function is understood to mean, in particular, that the object fulfills and / or performs this specific function in at least one application and / or operating state. Preferably, the release mechanism is at least partially formed integrally with the interface unit. Furthermore, the release mechanism can be provided by a clamping unit, in particular a quick-release nut with an integrated release mechanism.

[0006] Furthermore, it is proposed that the interface unit has at least one tool contact surface for the application of a loosening tool, in particular a wrench, wherein the tool contact surface extends transversely, and in particular at least substantially perpendicularly, to a principal extension plane of the interface. "Transversely" here is understood to mean, in particular, an orientation of a direction and / or an axis relative to a reference direction and / or a reference axis, wherein the orientation of the direction and / or the axis is at least different from an orientation that is at least substantially parallel to the reference direction and / or the reference axis and is in particular skew or perpendicular to the reference direction and / or the reference axis. The tool contact surface can, in particular, be designed as a two-sided shape, especially with a wrench opening, as a square, or the like.The at least one tool contact surface is preferably arranged at the interface of the interface unit. Furthermore, the release mechanism preferably has at least one tool surface, in particular a two-sided shape, especially with a wrench size. Advantageously, this allows for easy removal of the machine tool accessory from the adapter device and / or from the machine tool.

[0007] Furthermore, it is proposed that the additional interface has a longitudinal axis extending at least substantially perpendicular to a principal extension plane of the interface. "Substantially perpendicular" is understood to mean, in particular, an orientation of a direction of a line or plane, especially a direction of a force, relative to a reference direction, another line, or another plane, particularly the plane of motion, wherein the direction, line, or plane and the reference direction, the other line, or the other plane, especially when viewed in a projection plane, enclose an angle of 90°, and the angle has a maximum deviation of, in particular, less than 8°, preferably less than 5°, and most preferably less than 2°. The additional interface is preferably designed as a threaded bolt, the thread of which is arranged radially to a longitudinal axis of the additional interface.The threaded bolt is specifically designed to accommodate a machine tool accessory intended for machine tools with a lead screw drive. The thread of the threaded bolt preferably has a pitch of at least 1.5 mm, particularly for an M10 thread, preferably at least 2 mm, particularly for an M14 thread, or most preferably at least 2.309 mm, particularly for a 5 / 8-inch thread. The thread of the threaded bolt is preferably configured as an M10 thread, an M14 thread, or a 5 / 8-inch thread. The longitudinal axis is preferably at least substantially congruent with the axis of rotation of the thread. In an operating state, the longitudinal axis of the further interface is, in particular, a continuation of a tool rotation axis of the tool holder of the machine tool. The interface and the further interface are preferably formed in one piece.The interface unit can be designed in a screw-like manner. This allows for the advantageously efficient transmission of torque.

[0008] Furthermore, at least one drainage control unit is proposed, comprising at least one drainage control element that at least partially accommodates the interface unit and / or can be arranged on the interface unit. The drainage control element defines at least one through-hole. The drainage control element is designed to accommodate the further interface by means of the hole. Furthermore, the drainage control element defines a further recess, in particular a depression and / or a depression, which is designed in particular to at least partially accommodate the interface unit, in particular the interface itself. The further recess is in particular formed by a depression that is at least substantially cylindrical. The through-hole is in particular arranged at the center of the further recess. The through-hole is in particular arranged coaxially with the further recess.The inventive design advantageously provides an integrated release mechanism. In an alternative embodiment, the release mechanism is arranged on a clamping unit. The clamping unit has, in particular, two clamping elements, each of which is designed as a release mechanism. In this embodiment, at least one release mechanism can be arranged on the interface unit, in particular on the further interface.

[0009] Furthermore, it is proposed that the release mechanism has at least one lifting extension which, in a state of the release mechanism arranged at the interface unit, extends towards the interface. The lifting extension is in particular formed by a ramp, a roller, a barrel, and / or a ball and is specifically designed to generate, by means of interaction with a correlating element, a movement of an element, in particular the release mechanism, especially a superimposed translational and rotational movement. Preferably, the at least one lifting extension is designed to move the release mechanism along its longitudinal axis as a result of a relative movement of the release mechanism relative to the interface unit. The lifting extension is preferably designed as a ramp which interacts with a further correlating lifting extension, which is also designed as a ramp.However, it is also conceivable that the lifting extension is designed as a roller or ball and interacts with the corresponding further lifting extension, which is designed as a ramp. The release mechanism preferably has at least two, more preferably at least four, and particularly preferably at least six lifting extensions. The lifting extensions preferably have a slope in the circumferential direction. The circumferential direction is, in particular, perpendicular to the longitudinal axis of the interface unit. A slope of the lifting extension and / or the further lifting extension is preferably equal to or greater than a slope of a thread of the further interface, in particular of the threaded bolt.The pitch of the stroke extension and / or the further stroke extension corresponds in particular to 100% to 150% of the pitch of the thread of the further interface, especially the threaded bolt, preferably 110% to 140% of the pitch of the thread of the further interface, especially the threaded bolt, and particularly preferably 120% of the pitch of the thread of the further interface, especially the threaded bolt. The pitches of the stroke extensions have, in particular, the same thread pitch direction as the thread of the further interface designed as a threaded bolt. This advantageously provides effective protection against slippage during braking of the machine tool.

[0010] Furthermore, it is proposed that the drainage safety unit comprises at least one additional drainage safety element arranged on a side of the interface unit facing away from the interface, wherein the lifting extension of the drainage safety element is designed to correlate with the further lifting extension of the additional drainage safety element. The additional drainage safety element is preferably formed integrally with the interface unit. Preferably, the additional drainage safety element is movably mounted within the drainage safety element. The additional drainage safety element is, in particular spatially, at least partially arranged within the drainage safety element. Preferably, the drainage safety element is cup-shaped so that the additional drainage safety element can be received by the drainage safety element.By arranging the additional drainage safety element within the drainage safety element, advantageous self-centering of the drainage safety unit can be achieved. In this case, the extent of the additional drainage safety element in a plane parallel to the main extension plane of the interface is smaller than the extent of the drainage safety element that also extends in a plane parallel to the main extension plane of the interface. This advantageously saves installation space, allowing for a particularly compact adapter device. Preferably, the lifting extension is designed to move the drainage safety element along an axial direction relative to the additional drainage safety element. Preferably, the additional drainage safety element has the same number of lifting extensions as, in particular, the drainage safety element.This advantageously allows for a relative movement of the release mechanism, which prevents the machine tool accessory from unintentionally detaching from the adapter device.

[0011] Furthermore, at least one release mechanism is proposed, which has at least one stop element designed to limit the rotational range of the release mechanism by interacting with the interface unit, in particular with a tool contact surface of the interface unit. Preferably, the at least one stop element is arranged on a side of the release mechanism facing the tool contact surface of the interface unit. Preferably, the release mechanism has at least two stop elements, each of which interacts with one of the tool contact surfaces of the interface unit. By means of the embodiment according to the invention, an angular range over which the interface unit can be rotated relative to the release mechanism can advantageously be limited.The angle range is particularly less than 25°, preferably less than or equal to 20°, and most preferably exactly 20°. Furthermore, the relative movement of the release mechanism is advantageously defined and limited.

[0012] Furthermore, at least one locking unit and at least one release locking unit are proposed, wherein the locking unit comprises at least one locking element designed to secure at least one release locking element of the release locking unit at least axially to the interface unit when the machine tool accessory is detached. The design according to the invention advantageously ensures quick and easy removal of the machine tool accessory from the machine tool. The locking unit can be arranged, in particular, on the interface unit, especially on the further interface.The locking element can be designed as a force-locking element and / or as a form-locking element, such as a rubber element, in particular an O-ring, which can be applied to the interface unit, as a spring-elastic locking element, as a locking clip or the like, and is in particular intended to detachably secure the further drainage locking element axially to the interface unit.

[0013] Furthermore, a machine tool system is proposed comprising at least one machine tool, in particular an angle grinder, a machine tool accessory, in particular a grinding wheel, and an adapter device according to the invention. Preferably, the machine tool system has a further clamping element, which is particularly intended for clamping the machine tool accessory onto the discharge safety unit.

[0014] The design of the machine tool system according to the invention enables advantageously simple and quick assembly of the machine tool system, in particular the adapter device.

[0015] The adapter device and / or the machine tool system according to the invention are not intended to be limited to the application and embodiment described above. In particular, the adapter device and / or the machine tool system according to the invention may, in order to fulfill a function described herein, have a different number of individual elements, components, and units than the number specified herein. Furthermore, values ​​within the specified limits of the value ranges stated in this disclosure are also considered disclosed and freely usable. drawing

[0016] Further advantages become apparent from the following description of the drawings. The drawings illustrate two exemplary embodiments of the invention. The drawings, the description, and the claims contain numerous features in combination. A person skilled in the art will expediently consider the features individually and combine them into meaningful further combinations.

[0017] They show: Fig. 1 a machine tool system with an adapter device according to the invention in a schematic representation, Fig. 2 a first embodiment of an adapter device according to the invention, clamped in a tool holder of a machine tool with a clamping unit, in a schematic full-section view, Fig. 3 an interface unit according to the invention and a release element of a release unit in a schematic representation, Fig. 4 a further release element of the adapter device according to the invention in a schematic representation, Fig. 5 a top view of the adapter device according to the invention with a release unit and a stop element in a schematic representation, Fig. 6 an interface unit of a second embodiment without an integrated release unit in a schematic representation, Fig.7. An adapter device according to the invention of the second embodiment, clamped in a tool holder of a machine tool with a nut, in a schematic full-section view; Fig. 8. The nut of the second embodiment with integrated anti-run device in a schematic view from above; and Fig. 9. The nut of the second embodiment with integrated anti-run device in a schematic view from below. Description of the exemplary implementations

[0018] Figure 1 Figure 1 shows a schematic representation of a machine tool system 50a comprising a machine tool 18a designed as an angle grinder and a machine tool accessory 12a connected to the machine tool 18a by means of an adapter device 10a according to the invention. The machine tool 18a accommodates at least one machine tool accessory 12a.

[0019] The machine tool accessory 12a can be flat and at least essentially disc-shaped.

[0020] The machine tool accessory 12a has a fictitious tool rotation axis a and a mounting interface 14a for connection to a tool holder 16a of the machine tool 18a. The tool rotation axis a defines a center point of the adapter device 10a and the machine tool accessory 12a, about which the adapter device 10a and the machine tool accessory 12a rotate during operation with the machine tool 18a.

[0021] Figure 2Figure 1 shows a full section of a schematic representation of the tool holder 16a of the machine tool 18a with a clamping unit 52a. The clamping unit 52a has at least two clamping elements 54a. The clamping elements 54a are designed as clamping jaws. The clamping elements 54a of the tool holder 16a of the machine tool 18a engage with an interface unit 20a. The clamping elements 54a engage with an interface 22a of the interface unit 20a. The interface 22a has a recess 56a. The recess 56a is bounded in a plane by at least one clamping wing 58a, which extends in a reversible plane towards the tool rotation axis a, as shown in Figure 1. Figure 5The four clamping wings 58a form an X-shaped recess in the interface 22a. The interface 22a has a principal extent plane 30a. The clamping wings 58a lie within the principal extent plane 30a of the interface 22a. The clamping wings 58a are designed to form a clamping surface for the clamping elements 54a. The clamping elements 54a engage beneath the clamping wings 58a. The clamping elements 54a form a positive and / or force-fit connection with the clamping wings 58a.

[0022] The interface unit 20a has a further interface 24a. The further interface 24a is designed as a threaded bolt. The further interface 24a has a longitudinal axis 32a. The longitudinal axis 32a is also the axis of rotation of the thread of the further interface 24a, which is designed as a threaded bolt. The longitudinal axis 32a of the further interface 24a is arranged perpendicular to the principal extension plane 30a of the interface 22a. The interface 22a and the further interface 24a are arranged at least substantially perpendicular to each other within the interface unit 20a. The interface 22a is formed integrally with the further interface 24a as a single interface unit 20a.

[0023] A flow control unit 26a is arranged at the interface unit 20a. The flow control unit 26a is arranged on the side of the interface unit 20a facing away from the main extension plane 30a of the interface 22a, as shown in Figure 2 The drainage safety unit 26a at least partially accommodates the interface unit 20a. The drainage safety unit 26a has a drainage safety element 34a. The drainage safety element 34a has a through-hole 60a. The through-hole 60a is designed to accommodate the further interface 24a, which is designed as a threaded bolt. The drainage safety element 34a has at least one lifting extension 36a. The drainage safety element 34a has six lifting extensions 36a. The lifting extensions 36a are arranged in a ramp-like fashion around the through-hole 60a on one side of the drainage safety element 34a facing the interface 22a of the interface unit 20a, as shown in Figure 4 becomes visible. The drainage safety element 34a has a receiving extension 62a ( Fig. 2 The receiving extension 62a axially receives the mounting interface 14a of the machine tool accessory 12a. In its assembled state, the machine tool accessory 12a is placed on the receiving extension 62a on the side of the release element 34a facing away from the interface 22a. The adapter device 10b has a locking unit 46a. The locking unit 46a has a locking element 48a. The locking element 48a is designed as a retaining ring. The locking element 48a is designed to axially secure the release element 34a to the interface unit 20a. The locking element 48a is designed to ensure axial movement of the release element 34a.

[0024] The machine tool system 12a has a clamping unit 64a. The clamping unit 64a is designed to secure the machine tool accessory 12a axially to the further interface 24a of the interface unit 20a and radially to the release unit 26a when assembled. The clamping unit 64a is designed as a nut.

[0025] The drainage safety unit 26a has a further drainage safety element 38a. The further drainage safety element 38a is formed integrally with the interface unit 20a, as shown in Figure 3The further drainage safety element 38a is visible. It is arranged on the side of the interface unit 20a facing away from the main extension plane 30a of the interface 22a. The further drainage safety element 38a has at least one further ramp-shaped lifting extension 42a. The further drainage safety element 38a has six further lifting extensions 42a. The lifting extensions 36a of the drainage safety element 34a are designed to correlate with the further lifting extensions 42a of the further drainage safety element 38a. The lifting extensions 36a of the drainage safety element 34a are designed to form a positive-locking and force-locking connection with the further lifting extensions 42a of the further drainage safety element 38a. The discharge safety element 34a and the further discharge safety element 38a are designed for relative movement, with the correlating lifting extensions 36a, 42a designed for axial movement.

[0026] The interface unit 20a has at least one tool contact surface 28a. The interface unit 20a has two parallel tool contact surfaces 28a. The tool contact surfaces 28a form a two-sided shape with a wrench-like width. The tool contact surfaces 28a are arranged on the interface unit 20a at least substantially perpendicular to the main extension plane 30a of the interface 22a. The release control element 34a has two stop elements 44a. The stop elements 44a, by means of an interaction with the tool contact surfaces 28a on the interface unit 20a, limit the movement of the release control unit 26a in an operating state. The release control element 34a has two parallel tool contact surfaces 28a. The tool contact surfaces 28a of the release control element 34a are arranged on the stop elements 44a of the release control unit 26a on a side facing away from the interface unit 20a.The stop elements 44a of the release safety unit 26a are designed to limit a relative movement of the release safety unit 26a.

[0027] In the Figures 6 to 9 A further embodiment of the invention is shown. The following description and drawings are essentially limited to the differences between the embodiments, whereby with regard to identically designated components, in particular with regard to components with the same reference numerals, reference is generally also made to the drawings and / or the description of the other embodiment. Figures 1 to 5 Reference can be made to the following. To distinguish the embodiments, the letter a is the reference numeral of the embodiment in the Figures 1 to 5 recreated. In the further embodiment of the Figures 6 to 9 The letter a is replaced by the letter b.

[0028] Figure 6Figure 1 shows an interface unit 20b of a further embodiment of an adapter device 10b according to the invention. The interface unit 20b has an interface 22b and a further interface 24b. The interfaces 22b and 24b are formed in one piece. The adapter device 10b has two tool contact surfaces 28b. The tool contact surfaces 28b are arranged parallel to a longitudinal axis 32b of the further interface 24b on the interface unit 20b.

[0029] The adapter device 10b has an interface unit 20b. In an operating state, the interface 22b receives a clamping unit 52b of the tool holder 16b of a machine tool. The clamping unit 52b has two clamping jaws 54b. The interface 22b is designed for a positive and / or non-positive connection with the clamping jaws 54b. The interface 22b is designed to receive a torque supplied by the machine tool. The further interface 24b is designed for a positive and / or non-positive connection with the mounting interface 14b of the machine tool accessory 12b. The further interface 24b is designed to supply a torque to a machine tool accessory 12b. In a mounted state, the machine tool accessory 12b is arranged on one side of the interface unit 20b facing away from the interface 22b. The adapter device 10b has a clamping unit 64b.The clamping unit 64b is designed as a nut. The clamping unit 64b clamps the machine tool accessory 12b to the interface unit 20b.

[0030] The adapter device 10b has a release mechanism 26b. The release mechanism 26b is arranged on the clamping unit 64b. The clamping unit 64b has two clamping elements 66b and 68b. The release mechanism 26b has a release element 34b. The release element 34b is formed integrally with a clamping element 66b. The release mechanism 26b has a further release element 38b. The further release element 38b is formed integrally with another clamping element 68b. The release element 34b has a receiving extension 62b. The machine tool accessory 12b is clamped axially on the receiving extension 62b and radially on one side of the release element 34b of the release mechanism 26b facing the interface 22b, as shown. Figure 7 illustrated.

[0031] The Figures 8 and 9Figure 64b shows an exploded view of the clamping unit. The release mechanism 34b has a ramp-shaped lifting extension 36b, which is formed integrally with the release mechanism 34b. The release mechanism 34b has four ramp-shaped lifting extensions 36b, which are formed integrally with the release mechanism 34b. The further release mechanism 38b has four further lifting extensions 42b, which correspond to the four lifting extensions 36b of the release mechanism 34b. The release mechanism 34b has at least one receptacle 70b. The further release mechanism 38b has one stop element 44b. The further release mechanism 38b has three stop elements 44b. The stop elements 44b limit a rotation between the clamping element 66b and the further clamping element 68b to an angular range defined by a dimension of the receptacles 70b and a dimension of the stop elements 44b.This allows the clamping unit 64b to be released as desired, for example, during a tool change. If the clamping unit 64b is rotated clockwise or counterclockwise from the angle grinder 18b during operation, the clamping element 66b is rotated relative to the other clamping element 68b until the stop elements 44b of the other clamping element 68b abut the edge regions of the receptacles 70b of the clamping element 66b. The clamping element 66b is thus firmly coupled to the other clamping element 68b by means of the abutment or contact of the stop elements 44b with the edge regions of the receptacles 70b. During rotation of the clamping element 66b relative to the other clamping element 68b as a result of braking, the corresponding stroke extensions 36b, 42b generate an axial stroke along an axial direction of the clamping element 66b relative to the other clamping element 68b.

Claims

1. Adaptor device (10a; 10b) for fastening a power-tool accessory (12a; 12b) to a tool holder (16a; 16b), formed differently from a fastening interface (14a; 14b) of the power-tool accessory (12a; 12b) and having a clamping unit, of an in particular portable power tool (18a; 18b), in particular an angle grinder, having at least one interface unit (20a; 20b) which has at least one interface (22a; 22b), assigned to the tool holder (16a; 16b) and formed in particular differently from a thread, for form-fitting and / or rotationally secured connection to the tool holder (16a; 16b), and has at least one further interface (24a; 24b), assigned to the power-tool accessory (12a; 12b) and in the form of a threaded bolt, for form-fitting and / or rotationally secured connection to the fastening interface (14a; 14b) of the power-tool accessory (12a; 12b), characterized in that the interface (22a, 22b) has a cutout (56a) delimited in a plane by at least one clamping wing (58a) which extends in a peripheral plane in relation to the tool axis of rotation (a), wherein the at least one clamping wing (58a) is intended to form a clamping surface for the clamping unit.

2. Adaptor device according to Claim 1, characterized by at least one detachment-prevention unit (26a; 26b) which is intended to counteract an unwanted release of the connection between the power-tool accessory (12a; 12b) and the further interface (24a; 24b), in particular a detachment of the power-tool accessory (12a; 12b) from the further interface (24a; 24b) in the form of a threaded bolt.

3. Adaptor device according to Claim 1 or 2, characterized in that the interface unit (20a; 20b) has at least one tool-abutment surface (28a; 28b) for placement of a release tool, in particular an open-ended spanner, wherein the tool-abutment surface (28a; 28b) extends transversely, in particular at least substantially perpendicularly, to a main extent plane (30a; 30b) of the interface (22a; 22b).

4. Adaptor device according to one of the preceding claims, characterized in that the further interface (24a; 24b) has a longitudinal axis (32a; 32b) which extends at least substantially perpendicularly to a main extent plane (30a; 30b) of the interface (22a; 22b).

5. Adaptor device according to one of the preceding claims, characterized by at least one detachment-prevention unit (26a; 26b) having at least one detachment-prevention element (34a; 34b), the latter at least partially receiving the interface unit (20a; 20b) and / or being arrangeable on the interface unit (20a; 20b).

6. Adaptor device at least according to Claim 5, characterized in that the detachment-prevention element (34a; 34b) has at least one travel extension means (36a; 36b) which, in a state of the detachment-prevention element (34a; 34b) in which it is arranged on the interface unit (20a; 20b), extends in the direction of the interface (22a; 22b).

7. Adaptor device at least according to Claim 6, characterized in that the detachment-prevention unit (26a; 26b) has at least one further detachment-prevention element (38a; 38b) which is arranged on a side of the interface unit (20a; 20b) that faces away from the interface (22a; 22b), wherein the at least one travel extension means (36a; 36b) of the detachment-prevention element (34a; 34b) is formed in a manner correlating with at least one further travel extension means (42a; 42b) of the detachment-prevention element (38a; 38b).

8. Adaptor device according to one of the preceding claims, characterized by at least one detachment-prevention unit (26a; 26b) having at least one stop element (44a; 44b), the latter being intended for limiting a rotational clearance of the detachment-prevention unit (26a; 26b) by means of interaction with the interface unit (20a; 20b), in particular with a tool-abutment surface (28a; 28b) of the interface unit (20a; 20b).

9. Adaptor device according to one of the preceding claims, characterized by at least one securing unit (46a) and at least one detachment-prevention unit (26a; 26b), wherein the securing unit (46a) has at least one securing element (48a) which is intended for securing at least one detachment-prevention element (34a; 34b) of the detachment-prevention unit (26a; 26b) at least axially on the interface unit (20a; 20b) in the case of detachment of the power-tool accessory (12a; 12b).

10. Power-tool system (50a) having at least one power tool (18a), in particular an angle grinder, having a power-tool accessory (12a; 12b), in particular a grinding disc, and having an adaptor device (10a; 10b) according to one of the preceding claims.

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