Hand tool with a mounting interface

Abstract

A handheld power tool (100) comprising a housing (110) on which a fastening interface (150) is provided for fastening a tool attachment (200), which can be locked to the fastening interface (150) via at least one locking element (232), characterized in that the fastening interface (150) has a plurality of groove-like receptacles (152, 154, 156) for receiving the at least one locking element (232), wherein the groove-like receptacles (152, 154, 156) are aligned in the longitudinal direction of the fastening interface (150) and taper in an axial direction (199) pointing away from the handheld power tool (100),to enable at least one anti-rotation axial centering and an at least substantially tangentially and radially play-free fixing of the tool attachment (200) to the housing (110) by interaction with the at least one locking element (232) in the longitudinal direction of the fastening interface (150).

Description

State of the art

[0001] The present invention relates to a hand-held power tool having a housing on which a fastening interface is provided for fastening a tool attachment which can be locked to the fastening interface via at least one locking element.

[0002] A handheld power tool with a tool holder having a fastening unit is known from the publications DE 10 2011 084 499 A1, DE 10 2011 084 495 A1, US 6 688 611 B2, and US 2005 / 0191139 A1. The fastening unit serves as a locking and centering arrangement for an associated tool attachment. The correspondingly associated tool attachments each have an anti-rotation device for secure attachment to the fastening unit.

[0003] Such a hand-held power tool is known from the prior art, comprising a housing on which a fastening interface is provided for fastening a tool attachment, which can be locked to the fastening interface via a plurality of locking elements. Locking elements used include, for example, locking balls that are arranged radially displaceably in associated openings of a base body of the tool attachment and can be blocked or released by means of a locking sleeve that can be axially displaced on an outer circumference of the base body. In this case, the locking sleeve is, for example,is axially loaded by a spring element into a locking position in which the locking sleeve presses and blocks the locking balls radially inwards to lock the base body in the associated openings, and can be moved by an axial displacement against the spring force of the spring element into an unlocking position in which a radially outward displacement of the locking balls is made possible to unlock the base body and these are thus released.

[0004] A disadvantage of the state of the art is that such a hand-held power tool requires additional axial engagement elements to secure the corresponding tool attachment to the housing of the hand-held power tool in a rotationally secure manner. These elements complicate and increase the cost of the construction of the hand-held power tool and the tool attachment. Disclosure of the invention

[0005] An object of the invention is therefore to provide a new hand-held power tool to which a tool attachment can be secured against rotation.

[0006] This problem is solved by a handheld power tool with a housing on which a fastening interface is provided for fastening a tool attachment, which can be locked to the fastening interface via at least one locking element. The fastening interface has a plurality of groove-like receptacles for receiving the at least one locking element, wherein the groove-like receptacles are aligned in the longitudinal direction of the fastening interface and taper in an axial direction pointing away from the handheld power tool in order to enable at least one rotation-proof axial centering and an at least substantially tangentially and radially play-free fixation of the tool attachment to the housing through cooperation with the at least one locking element in the longitudinal direction of the fastening interface.

[0007] The invention thus enables the provision of a handheld power tool in which, through the interaction of a fastening interface assigned to the handheld power tool with one or more locking elements of a corresponding tool attachment, a secure and reliable, anti-twist fastening of the tool attachment to the handheld power tool is possible, so that additional axial engagement elements can be dispensed with. The invention thus also enables the provision of a straightforward and cost-effective fastening interface.

[0008] According to one embodiment, the groove-like receptacles are arranged in the circumferential direction of the fastening interface in order to enable the tool attachment to be fastened to the housing in a predetermined angular position.

[0009] This makes it easy to align the tool attachment in a desired angular position on the housing of the hand-held power tool.

[0010] The groove-like receptacles preferably taper in an axial direction away from the hand-held power tool in order to enable the anti-rotation axial centering of the tool attachment on the housing.

[0011] This makes it easy to achieve axial centering of the tool attachment on the hand tool without twisting.

[0012] Preferably, the groove-like receptacles have an at least approximately V-shaped end region.

[0013] Thus, the axial centering of the tool attachment on the hand tool can be further improved by the locking elements arranged in the groove-like receptacles.

[0014] According to one embodiment, the groove-like receptacles are designed to receive a locking ball which forms the at least one locking element.

[0015] The invention thus enables the provision of robust and cost-effective locking elements.

[0016] According to one embodiment, the fastening interface has a support element which is secured against rotation to the housing and is at least partially sleeve-shaped, on the outer circumference of which the groove-like receptacles are formed.

[0017] The invention thus enables the provision of a stable and inexpensive support element for forming the fastening interface.

[0018] According to one embodiment, a tool holder is provided in the area of the fastening interface, which has a receiving body connected to an output shaft of the handheld power tool for receiving an insert tool. The receiving body is preferably designed to receive a drive shaft of the tool attachment with tangential and axial play and to transmit torque to the drive shaft.

[0019] This allows for a simple transfer of torque generated by the handheld power tool and provided on the output side to the drive shaft of the tool attachment. Furthermore, the tangentially and axially play-free mount enables quick and secure installation of the tool attachment on the handheld power tool.

[0020] Preferably, the tool holder has a locking sleeve which is pre-tensioned by a spring element in the direction of the insert tool and which is designed to enable spring loading of the tool attachment in the mounted state of the tool attachment on the housing in an axial direction pointing away from the hand-held power tool.

[0021] This allows the axial centering of the tool attachment on the hand tool to be further improved.

[0022] The problem mentioned above is also solved by a tool attachment with at least one locking element for locking to a handheld power tool, which has a housing with a fastening interface for fastening the tool attachment, to which the tool attachment can be locked via the at least one locking element. The at least one locking element is biased by a locking sleeve into an associated locking position in order to enable, by interacting with the fastening interface in the longitudinal direction of the fastening interface, at least one rotation-proof axial centering and an at least substantially tangentially and radially play-free fixation of the tool attachment to the housing.

[0023] Furthermore, the problem mentioned above is also solved by a tool system comprising a handheld power tool and a tool attachment, wherein the handheld power tool has a housing on which a fastening interface is provided for fastening the tool attachment provided with at least one locking element. The tool attachment can be locked to the fastening interface via the at least one locking element.The fastening interface has a plurality of groove-like receptacles for receiving the at least one locking element, wherein the groove-like receptacles are aligned in the longitudinal direction of the fastening interface and taper in an axial direction pointing away from the hand-held power tool in order to enable at least one rotation-proof axial centering and an at least substantially tangentially and radially play-free fixing of the tool attachment to the housing by interacting with the at least one locking element in the longitudinal direction of the fastening interface.

[0024] Preferably, the tool attachment has a locking sleeve which releases the at least one locking element in an unlocking position from the respective groove-like receptacles, wherein the at least one locking element can be transferred into other groove-like receptacles in order to enable a change of a predetermined angular position of the tool attachment on the housing without pulling the tool attachment off the fastening interface.

[0025] This allows for comfortable, one-handed operation of the tool attachment when changing the specified angular position. Short description of the drawings

[0026] The invention is explained in more detail in the following description with reference to exemplary embodiments illustrated in the drawings. They show: Fig. 1 a schematic view of a hand-held power tool with a tool holder and a fastening interface according to an embodiment, Fig. 2 a sectional view of a tool attachment according to an embodiment, Fig. 3 a sectional view of a tool system with the hand tool of Fig. 1 and the tool attachment of Fig. 2 with an example of how the tool attachment is attached to the hand tool, Fig. 4 the sectional view of the tool system of Fig. 3 with the tool attachment attached to the hand tool, and Fig. 5 a sectional view of the tool system of Fig. 4, seen in the direction of arrows VV of Fig. 4. Description of the embodiments

[0027] Fig. 1 shows a handheld power tool 100 provided with a tool holder 140, which has a housing 110 with a handle 126. According to one embodiment, the handheld power tool 100 can be mechanically and electrically connected to a battery pack 130 for mains-independent power supply.

[0028] The handheld power tool 100 is embodied, for example, as a cordless impact wrench. However, it should be noted that the present invention is not limited to cordless impact wrenches, but rather can be applied to various handheld power tools that have a tool holder corresponding to the tool holder 140, regardless of whether the handheld power tool is electrically operated, i.e., independently of the mains using the battery pack 130 or mains-dependent, and / or non-electrically.

[0029] An electric drive motor 114, powered by the battery pack 130, a gear 118, and an optional impact mechanism 122 are arranged in the housing 110. The drive motor 114 can be actuated, e.g., via a hand switch 128, i.e., switched on and off, and can preferably be electronically controlled or regulated in such a way that both reversing operation and specifications regarding a desired rotational speed can be realized.

[0030] According to one embodiment, the drive motor 114 is an electronically commutated drive motor, preferably a DC motor, which illustratively has stator and rotor components 111 and 117, respectively. Here, the stator components 111 form, for example, an outer stator, and the rotor components 117 form, for example, an inner rotor. However, it should be noted that the description of a drive motor designed in the manner of an electronically commutated drive motor with an outer stator and inner rotor is merely exemplary and should not be understood as a limitation of the invention, which can also be applied to a drive motor with an inner stator and outer rotor or, for example, to a brush-type commutator motor.

[0031] The drive motor 114 is connected via an associated motor shaft 116 to the gear 118, which converts rotation of the motor shaft 116 into rotation of a drive member 120, e.g., a drive shaft, provided between the gear 118 and the striking mechanism 122. This conversion preferably occurs such that the drive member 120 rotates relative to the motor shaft 116 with increased torque but reduced rotational speed. The drive motor 114 is illustratively arranged in a motor housing 115, and the gear 118 is arranged in a gear housing 119, with the gear housing 119 and the motor housing 115 being arranged, by way of example, in the housing 110.

[0032] The optional percussion mechanism 122 connected to the drive member 120 is, for example, a rotary or rotational percussion mechanism that generates sudden, high-intensity rotational pulses and transmits them to an output shaft 124, e.g., an output spindle. An exemplary percussion mechanism with which the percussion mechanism 122 can be implemented is described in DE 20 2006 014 850 U1, to which reference is expressly made here and whose teachings are to be understood as part of the present description. Therefore, a detailed description of the percussion mechanism 122 can be omitted here for the sake of brevity.

[0033] The tool holder 140 is formed on the output shaft 124 and illustratively has a holder body 147 with an internal polygonal holder 148, which is provided for receiving insert tools with external polygonal couplings. On the outer circumference of the holder body 147, which is connected, for example, in a rotationally fixed manner and / or integrally to the output shaft 124, there is, for example, a spring element (220 in Fig. 3) a spring-loaded locking sleeve 149 is arranged in an axial direction 199 pointing away from the hand-held power tool 100 for locking suitable insert tools in the polygonal socket 148.

[0034] The tool holder 140 is designed, for example, in the manner of a bit holder, i.e., for receiving an insert tool 170 designed in the manner of a screwdriver bit, which is inserted into the polygonal socket 148 in the direction of the hand-held power tool 100, as indicated by an arrow 299. Such a screwdriver bit, which is illustratively of the so-called HEX type, is sufficiently known from the prior art, so that a detailed description is omitted here for the sake of brevity. It should be noted, however, that the present invention is not limited to the use of HEX screwdriver bits, but that other insert tools can also be used depending on the particular configuration of the tool holder 140 selected, e.g., HEX drills or so-called SDS-Quick insert tools.Furthermore, it is pointed out that the structure and functioning of a suitable bit holder are sufficiently known to the person skilled in the art, so that a detailed description of the bit holder 140 can be omitted here for the sake of brevity of the description.

[0035] According to one embodiment, the handheld power tool 100 is assigned a fastening interface 150, which is illustratively fixed axially and radially to the housing 110 in the area of the bit holder 140. However, it should be noted that the fastening interface 150 is merely exemplary and is designed as a separate component and can alternatively be formed integrally with the housing 110.

[0036] The fastening interface 150 serves for fastening, in particular a fastening aligned in a predetermined angular position, an associated tool attachment (200 in Fig. 2) and illustratively comprises a sleeve-shaped carrier element 158, which is secured against rotation to an end face 112 of the housing 110 and has an outer circumference 159, at least in sections. This carrier element 158, also referred to below as the "fastening sleeve," encloses, for example, at least in sections, the bit holder 140 with a predetermined radial spacing in order to enable axial displacement of the locking sleeve 149 of the bit holder 140 inside the fastening sleeve 158.

[0037] On the outer circumference 159 of the fastening sleeve 158, a plurality of groove-like receptacles 152, 154, 156, 157 for receiving at least one and preferably a plurality of locking elements (232 in Fig. 2), wherein the groove-like receptacles 152, 154, 156, 157 are aligned in the longitudinal direction of the fastening interface 150, i.e. in the direction 199 and 299 respectively. The groove-like receptacles 157 are designed, for example, in such a way that they can accommodate fastening elements such as rivets or screws for fastening the fastening sleeve 158 to the end face 112 of the housing 110. By way of example, three groove-like receptacles 152, three groove-like receptacles 154 and three groove-like receptacles 156 are provided, each of which is spaced apart from one another by a groove-like receptacle 157, so that three groove-like receptacles 157 are also provided. However, it should be noted that the total of twelve groove-like receptacles 152, 154, 156, 157 are merely exemplary and are not to be understood as a limitation of the invention.

[0038] According to one embodiment, at least the groove-like receptacles 152, 154, 156 taper in the axial direction 199 pointing away from the hand-held power tool 100 in order to ensure a rotation-proof axial centering of an associated tool attachment (200 in Fig. 2) on the housing 110, as described below at Fig. 3 to 5. Illustratively, the groove-like receptacles 152, 154, 156 each have an at least approximately V-shaped end region 153.

[0039] Fig. 2 shows an exemplary tool attachment 200 which, according to one embodiment, is adapted for attachment to the attachment interface 150 of the hand-held power tool 100 of Fig. 1. The tool attachment 200 is illustratively designed in the manner of an angle attachment and has, for example, a locking section 202 and a drive unit 204, also referred to below as the "angle drive section." However, it should be noted that the tool attachment 200 is designed as an angle attachment only by way of example and does not limit the invention. Rather, the tool attachment 200 can have any desired configuration, e.g., in the manner of a drill chuck adapter or an eccentric attachment, etc.

[0040] The angle drive section 204 has, for example, an attachment housing 210 in which a rotatably drivable drive shaft 268 of the tool attachment 200 is rotatably mounted. The drive shaft 268 serves to drive an output shaft 205 arranged at a predetermined angle, illustratively 90°, thereto, which is also rotatably mounted in the attachment housing 210 and, for example, for receiving the screwdriver bit 170 of Fig. 1. However, it should be noted that a suitable implementation of the angle drive section 204 is sufficiently known from the prior art, so that a detailed description of the angle drive section 204 can be omitted here for the sake of brevity.

[0041] In the area of a free end 269 of the drive shaft 268 facing away from the angle drive section 204, on which end a polygonal driving contour 265 is formed, for example, a closure and guide member 280 is arranged, which is at least partially sleeve-shaped and through which the drive shaft 268 extends. This closure and guide member 280 is fastened to the attachment housing 210 via suitable fastening members 288, e.g. screws or rivets. In addition, the drive shaft 268 is assigned an actuating member 270 provided with a free end 278, which at least partially surrounds the drive shaft 268 in a sleeve-like manner and whose functionality is described below at Fig. 3 and Fig. 4. The actuating member 270 is, for example, mounted in a bearing sleeve 292 provided in the front housing 210 and secured by a retaining ring 279 against slipping over the free end 269 of the drive shaft 268. Alternatively, the drive shaft 268 and the actuating member 270 can also be formed as a single piece.

[0042] According to one embodiment, the drive shaft 268 is rotatable relative to the actuating member 270. In this case, the retaining ring 279 can be designed in the manner of a plain bearing, e.g., a sintered bearing, pressed into the actuating member 270.

[0043] The locking section 202 illustratively has a base body 215, which is fastened to the closure and guide member 280 via associated fastening members 282, e.g., rivets or screws. The base body 215 illustratively forms an inner cavity 216 provided with an inner annular shoulder 291, into which the drive shaft 268 engages, and has an outer circumference 245, on which a locking sleeve 240 is arranged, which is axially displaceable against a spring force of a spring element 244. This locking sleeve 240 is prestressed by the spring element 244 in an axial direction pointing away from the tool attachment 200, which, when the tool attachment 200 is fastened to the handheld power tool 100, Fig. 1 points in the direction of the hand tool 100 and thus the direction 299 of Fig. 1. For this purpose, the spring element 244 is arranged between a clamping ring 214, which is formed by the locking sleeve 240, for example, but can also be designed as a separate component, and a locking washer 219 arranged in an annular groove 218 on the base body 215. Furthermore, an O-ring 217 is arranged in an inner annular groove 213 of the locking sleeve 240, which is blocked in the direction 299 on the locking washer 219, in order to prevent the locking sleeve 240 from slipping off the base body 215 due to a spring force applied by the spring element 244.

[0044] However, it should be noted that the description of the spring-loaded locking sleeve 240 is merely exemplary and should not be understood as a limitation of the invention. Alternatively, the locking sleeve 240 can also be designed to be rotatable, for example, so that spring loading can be dispensed with.

[0045] According to one embodiment, the locking portion 202 is connected to the fastening interface 150 of the hand-held power tool 100 via at least one and preferably a plurality of locking elements 232. Fig. 1 lockable, wherein the plurality of locking elements 232 at the fastening interface 150 of Fig. 1 can be blocked by the locking sleeve 240 in an associated locking position. According to one embodiment, these locking elements 232 are designed to cooperate with the fastening interface 150 of Fig. 1 in the longitudinal direction of the fastening interface 150 at least one anti-rotation axial centering and an at least substantially tangential and radial play-free fixing of the tool attachment 200 to the housing 110 of the hand-held power tool 100 of Fig. 1. Preferably, the plurality of locking elements 232 has at least one locking ball 231 engaging at least partially in an associated radial opening 233 of the base body 215.

[0046] Fig. 3 shows an embodiment of a tool system 300 with the hand tool 100 of Fig. 1 and the tool attachment 200 from Fig. 2 to illustrate an exemplary assembly of the tool attachment 200 on the hand tool 100. This is shown here only in sections using a section of the housing 110 of Fig. 1, on the front side 112 of which the fastening interface 150 of Fig. 1, and in which the output shaft 124 is rotatably mounted in an illustrative roller bearing 324, wherein the tool holder 140 of Fig. 1 is arranged.

[0047] To mount the tool attachment 200 on the fastening interface 150 of the handheld power tool 100, in a first step the locking sleeve 240 of the tool attachment 200 is moved from its locking position against the spring force of the spring element 244 in the direction 199 into its unlocking position, so that the locking balls 231 of the tool attachment 200 are released.Then, in a further step, the tool attachment 200 is positioned on the fastening interface 150 such that the base body 215 rests on the outer circumference 159 of the fastening sleeve 158 and the free end 269 of the drive shaft 268 of the tool attachment 200 engages in the polygonal socket 148 of the tool holder 140, while its actuating member 270 is brought with its free end 278 into contact with the locking sleeve 149 of the tool holder 140, which acts on the exemplary associated locking balls 249 radially inwards, wherein the locking balls 249 prevent unhindered insertion of the drive shaft 268 into the polygonal socket 148.In this case, the locking sleeve 149 is spring-loaded by a spring element 220 in the axial direction 199 pointing away from the hand-held power tool 100, so that the spring forces of the spring elements 244, 220 act in opposite directions when the tool attachment 200 is mounted on the hand-held power tool 100.

[0048] In a further step, the tool attachment 200 is now pushed in the direction of the hand-held power tool 100, i.e. in the direction 299, onto the fastening interface 150, e.g. until the inner annular shoulder 291 of the base body 215 comes to rest against the fastening sleeve 158. In this case, the locking sleeve 149 of the tool holder 140 is displaced in the direction 299 by the actuating member 270 of the tool attachment 200 against a spring force applied by the spring element 220, so that the locking balls 231 of the tool attachment 200 are inserted into the groove-like receptacles (152, 154, 156, 157 in Fig. 2) of the fastening sleeve 158 can engage and the free end 269 of the drive shaft 268 is inserted into the polygonal socket 148. In this case, the drive shaft 268 is accommodated in the polygonal socket 148 of the receiving body 147 of the tool holder 140 with tangential and axial play and preferably exclusively for torque transmission.

[0049] Subsequently, the locking sleeve 240 of the tool attachment 200 and thus the entire tool attachment 200 is released, whereupon the locking sleeve 240 is displaced back into its locking position in the direction 199 by the spring force of the spring element 244, in which position the locking sleeve 240 blocks or prevents the radially outward movement of the locking balls 231. At the same time, the actuating member 270 is acted upon in the direction 199 by the locking sleeve 149 of the tool holder 140 due to the spring force of the spring element 220, thus forcing an axial displacement of the entire tool attachment 200 in the direction 199.Thus, according to one embodiment, the actuating member 270 is designed to enable spring loading of the tool attachment 200 by the spring element 220 via the first locking sleeve 149 in the mounted state of the tool attachment 200 on the hand-held power tool 100 in the direction 199.

[0050] By the axial displacement of the entire tool attachment 200 in the direction 199, the locking balls 231 of the tool attachment 200 are moved into the V-shaped end regions 153 of the groove-like receptacles (152, 154, 156, 157 in Fig. 2) of the fastening sleeve 158 is pressed in, so that by means of an interaction of the fastening sleeve 158 or the fastening interface 150 with the locking balls 231 or the locking elements 232 in the longitudinal direction of the fastening interface 150, at least an axial centering secured against rotation and an at least substantially tangentially and radially play-free fixing of the tool attachment 200 to the housing 110 of the hand-held power tool 100 is made possible.

[0051] Fig. 4 shows the tool system 300 of Fig. 3 with the hand tool 100 of Fig. 1 and the tool attachment 200 from Fig. 2 in assembled state. Fig. 4 illustrates the spring loading of the actuating member 270 of the tool attachment 200 by the locking sleeve 149 of the tool holder 140 of the hand-held power tool 100.

[0052] Fig. 5 shows the tool system 300 of Fig. 4 with the hand tool 100 of Fig. 1 and the tool attachment 200 attached to its housing 110 of Fig. 2 in the assembled state, wherein one of the locking balls 231 engages in one of the groove-like receptacles 152, 154, 156, 157 of the fastening interface 150. Here, the angle attachment 200 is oriented, for example, in a predetermined angular position in which the output shaft 205 of Fig. 3 of the angle attachment 200, e.g., parallel to the longitudinal direction of the handle 126 of Fig. 1 of the hand tool 100.

[0053] According to an embodiment as described below, a change in the predetermined angular position can be effected without removing the tool attachment 200 from the fastening interface 150. For this purpose, the locking sleeve 240 is Fig. 4 in the direction of arrow 199 into the Fig. 3 described unlocking position, but without an axial displacement of the tool attachment 200. By this displacement of the locking sleeve 240 into the unlocking position, the locking balls 231 are released and can slip out of the respective groove-like receptacles 152, 154, 156, 157 upon rotation of the tool attachment 200 and be transferred into other groove-like receptacles 152, 154, 156, 157. If the locking balls 231 are transferred into the positions marked 231', e.g. by rotation of the tool attachment 200 in Fig. 5 clockwise, this corresponds to a rotation of the angle attachment 200 by approximately 60°. The angle attachment 200 can then be released by releasing the locking sleeve 240 again from Fig. 4 as in Fig. 3 described in its new angular position.

Claims

[1] Hand-held power tool (100) with a housing (110) on which a fastening interface (150) is provided for fastening a tool attachment (200), which can be locked to the fastening interface (150) via at least one locking element (232), characterized by in that the fastening interface (150) has a plurality of groove-like receptacles (152, 154, 156) for receiving the at least one locking element (232), wherein the groove-like receptacles (152, 154, 156) are aligned in the longitudinal direction of the fastening interface (150) and taper in an axial direction (199) pointing away from the hand-held power tool (100) in order to enable at least one rotation-proof axial centering and an at least substantially tangentially and radially play-free fixing of the tool attachment (200) to the housing (110) by interacting with the at least one locking element (232) in the longitudinal direction of the fastening interface (150). [2] Hand tool according to claim 1, characterized by that the groove-like receptacles (152, 154, 156) are arranged in the circumferential direction of the fastening interface (150) in order to enable the tool attachment (200) to be fastened to the housing (110) in a predetermined angular position. [3] Hand tool according to claim 1 or 2, characterized by that the groove-like receptacles (152, 154, 156) have an at least approximately V-shaped end region (153). [4] Hand tool according to one of the preceding claims, characterized by that the groove-like receptacles (152, 154, 156) are designed to receive a locking ball (231) which forms the at least one locking element (232). [5] Hand tool according to one of the preceding claims, characterized bythat the fastening interface (150) has a support element (158) which is fastened to the housing (110) in a rotationally secured manner and which is at least partially sleeve-shaped, on the outer circumference (159) of which the groove-like receptacles (152, 154, 156) are formed. [6] Hand tool according to one of the preceding claims, characterized by in that a tool holder (140) is provided in the region of the fastening interface (150), which tool holder has a holder body (147) connected to an output shaft (124) of the hand-held power tool (100) for receiving an insert tool (170), wherein the holder body (147) is designed to receive a drive shaft (268) of the tool attachment (200) with tangential and axial play and to transmit torque to the drive shaft (268). [7] Hand tool according to claim 6, characterized byin that the tool holder (140) has a locking sleeve (149) which is prestressed by a spring element (220) in the direction of the insert tool (170) and which is designed to enable spring loading of the tool attachment (200) in the mounted state of the tool attachment (200) on the housing (110) in an axial direction (199) pointing away from the hand-held power tool (100). [8] Tool attachment (200) with at least one locking element (232) for locking to a hand-held power tool (100), which has a housing (110) with a fastening interface (150) for fastening the tool attachment (200), to which the tool attachment (200) can be locked via the at least one locking element (232), characterized bythat the at least one locking element (232) is acted upon by a locking sleeve (240) into an associated locking position in order to enable at least one rotation-proof axial centering and an at least substantially tangentially and radially play-free fixing of the tool attachment (200) to the housing (110) by interaction with the fastening interface (159) in the longitudinal direction of the fastening interface (150). [9] Tool system (300) with a hand-held power tool (100) and a tool attachment (200), wherein the hand-held power tool (100) has a housing (110) on which a fastening interface (150) is provided for fastening the tool attachment (200) provided with at least one locking element (232), wherein the tool attachment (200) can be locked to the fastening interface (150) via the at least one locking element (232), characterized byin that the fastening interface (150) has a plurality of groove-like receptacles (152, 154, 156) for receiving the at least one locking element (232), wherein the groove-like receptacles (152, 154, 156) are aligned in the longitudinal direction of the fastening interface (150) and taper in an axial direction (199) pointing away from the hand-held power tool (100) in order to enable at least one rotation-proof axial centering and an at least substantially tangentially and radially play-free fixing of the tool attachment (200) to the housing (110) by interacting with the at least one locking element (232) in the longitudinal direction of the fastening interface (150). [10] Tool system according to claim 9, characterized byin that the tool attachment (200) has a locking sleeve (240) which releases the at least one locking element (232) in an unlocking position from the respective groove-like receptacles (152, 154, 156), wherein the at least one locking element (232) can be transferred into other groove-like receptacles (152, 154, 156) in order to enable a change in a predetermined angular position of the tool attachment (200) on the housing (110) without pulling the tool attachment (200) off the fastening interface (150).

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