HAND MACHINE TOOL

Description

[0001] The present invention relates to a hand-held power tool according to the preamble of claim 1. State of the art

[0002] EP 2 771 151 B1 already discloses a handheld power tool with a drive motor, a gear mechanism, a percussion mechanism, and an output shaft. A tool holder is formed on the output shaft. The tool holder has a polygonal inner receptacle and a polygonal outer receptacle, the polygonal inner receptacle being designed for connection to an insert tool. A locking device is assigned to the tool holder, and the insert tool can be locked by means of the locking device.

[0003] DE 10 2013 204782 A1 discloses a hand-held power tool, according to the preamble of patent claim 1, with an output shaft on which a tool holder provided with a polygonal inner receptacle and a polygonal outer receptacle is arranged. Disclosure of the invention

[0004] The present invention provides a handheld power tool according to claim 1, wherein the handheld power tool comprises a drive unit and an output shaft on which a tool holder is formed, which has a polygonal inner receptacle for connection to a first insert tool and a polygonal outer receptacle for connection to a second insert tool. A locking unit for locking the first insert tool is assigned to the tool holder. It is proposed that the locking unit comprise at least one locking element, wherein the locking element has at least one contact surface that axially supports the second insert tool.

[0005] The drive unit comprises at least one drive motor and, in one embodiment, can have at least one gear mechanism. The drive motor can, in particular, be designed as at least one electric motor. The gear mechanism can be designed as at least one planetary gear mechanism, wherein it can, for example, be switchable. The invention can also be applied to other types of motors or gear mechanisms. In addition, the handheld power tool comprises a power supply, wherein the power supply is provided for battery operation using batteries, in particular handheld power tool battery packs, and / or for mains operation. In a preferred embodiment, the power supply is designed for battery operation. Within the scope of the present invention, a "handheld power tool battery pack" is understood to mean a combination of at least one battery cell and a battery pack housing.The handheld power tool battery pack is advantageously designed to supply power to commercially available battery-operated handheld power tools. The at least one battery cell can be designed, for example, as a Li-ion battery cell with a nominal voltage of 3.6 V. For example, the handheld power tool battery pack can comprise up to ten battery cells, although a different number of battery cells is also conceivable. An embodiment as a battery-operated handheld power tool as well as operation as a mains-operated handheld power tool are well known to those skilled in the art, which is why the details of the power supply will not be discussed here.

[0006] The drive unit is designed such that it can be operated via the handset. If the handset is operated by a user, the drive unit is switched on and the handheld power tool is put into operation. If the handset is no longer operated by the user, the drive unit is switched off. Preferably, the drive unit is electronically controllable and / or regulated such that reversing operation and a specification for a desired rotational speed can be implemented. It is also conceivable for the handset to be a latchable handset that can be latched in at least one position in at least one actuated state.

[0007] The handheld power tool is designed, in particular, as a rotary impact wrench. The rotary impact wrench has at least one impact mechanism, in particular a rotary impact mechanism. During operation, the impact mechanism generates high torque peaks to loosen stuck fasteners or tighten fasteners. The impact mechanism is connected to the drive motor via the gear box. The impact mechanism is also connected to the output shaft.

[0008] The tool holder is formed at a free end of the output shaft, in particular in a direction pointing away from the drive unit. The tool holder has the polygonal internal receptacle for connection to the first insert tool. The polygonal internal receptacle can be designed, for example, as a hexagon socket, so that the first insert tool can be received, for example in the form of a screwdriver bit. In addition, the tool holder comprises the polygonal external receptacle for connection to the second insert tool. The polygonal external receptacle can be designed, for example, as an external square receptacle. This makes it possible for the second insert tool to be received, for example, as a socket wrench. Such a screwdriver bit or socket wrench is sufficiently known from the prior art, so that a detailed description is omitted here.

[0009] Furthermore, the locking unit for locking the first insert tool is assigned to the tool holder. This enables safe and reliable operation of the handheld power tool, in particular of the impact wrench. According to the invention, the locking unit has the locking element. The locking element forms at least the contact surface which axially supports the second insert tool. The contact surface is formed, for example, in the direction away from the drive unit on the locking element as at least one end face transverse to a tool axis. Forces acting, in particular axial, on the second insert tool during operation of the handheld power tool can be reliably transmitted to the locking element via the contact surface in the housing. This enables safe and reliable use of the second insert tool with the handheld power tool.In particular, the second insert tool rests securely and reliably on the contact surface, regardless of the manufacturer of the second insert tool.

[0010] The handheld power tool has the tool axis, although a further tool axis may also be provided. The tool axis can be designed, for example, as a rotational axis of the output shaft. In particular, "axial" should be understood as essentially parallel to the tool axis. Whereas "radial" should be understood as essentially perpendicular to the tool axis.

[0011] During operation of the handheld power tool, axial forces can occur, for example, when the second insert tool is connected to the polygonal external receptacle or when a fastener is subjected to axial force by the second insert tool connected to the handheld power tool. This typically occurs when the fastener is screwed in or fastened into or to a fastener support, or when the fastener is unscrewed or loosened.

[0012] The fastening element can be a screw, a nut, or other similar threaded fastening element. The fastening support can be a plastic fastening support, such as a wall, a metal workpiece, or other similar fastening support. Furthermore, the fastening support can also comprise elastic fastening supports, such as a molded rubber part.

[0013] Furthermore, a maximum length of a rotary impact unit of 140 mm, in particular a maximum of 130 mm, and most particularly a maximum of 120 mm, is proposed. The rotary impact unit comprises the drive unit, at least the impact mechanism, and the locking unit. The length of the rotary impact unit from a front end of the locking unit, in particular from the contact surface of the locking element, to a rear end of a motor shaft of the drive unit is a maximum of 140 mm, in particular 130 mm, and most particularly 120 mm.

[0014] Advantageously, the locking element locks the first insert tool radially, and the second insert tool rests axially against the locking element. The radial locking of the first insert tool, for example the screwdriver bit, ensures secure and reliable fixation during operation of the handheld power tool. For example, the locking element engages in an at least partially circumferential groove of the first insert tool and thereby locks the first insert tool in the polygonal inner receptacle of the handheld power tool. If the second insert tool, for example the socket wrench, is connected to the polygonal outer receptacle, the second insert tool rests axially against the locking element. The second insert tool has at least one connecting element for connection to the polygonal outer receptacle. The connecting element can be formed on a rear end of the second insert tool.When the second insert tool is connected to the polygonal external receptacle, the second insert tool rests against the contact surface. The second insert tool is then in immediate and direct contact with the locking element. This allows the second insert tool to absorb the axial forces and transmit them to the locking element via the contact surface. The axial forces are transmitted safely and reliably, particularly regardless of the design of the connecting element of the second insert tool.

[0015] The locking unit preferably has at least one fixing element against which the locking element rests and which transmits axial forces into the output shaft. In one embodiment, the fixing element is arranged on the output shaft and is connected to it in a form-fitting and / or force-fitting manner. The fixing element can be, for example, a C-ring, a pin, a bolt or other comparable fixing elements. The output shaft has at least one receptacle for receiving the fixing element. The receptacle can, for example, be designed as at least one recess, an at least partially circumferential groove, as a through-opening or as another comparable receptacle. In one embodiment, the locking element rests directly and immediately axially on the fixing element.The axial forces absorbed by the second insert tool can then be transmitted directly and immediately to the fixing element.

[0016] Particularly advantageously, the locking unit comprises at least one return element, in particular a spring element. The return element rests, in particular axially, on the fixing element. The return element returns at least the locking element from an unlocking position, in which the first insert tool can be unlocked, to a locking position, in which the first insert tool can be locked. The return element is arranged on the output shaft, in particular axially. In one embodiment, the output shaft can accommodate the return element and mount it such that the return element is axially movable. The return element can be designed, for example, as a spring element, in particular a spiral spring, although other comparable return elements are also conceivable. The return element is supported directly and immediately on the fixing element.Furthermore, the return element is indirectly supported on the locking element via a support element. The return element at least causes the locking element to be moved from the unlocked position to the locked position. Furthermore, the return element ensures that the locking element is preloaded in the locked position.

[0017] To unlock the first insert tool, the locking element is moved, particularly by the user. In one embodiment, the locking element is moved in the direction away from the drive unit. It is also conceivable that, for unlocking, the locking element is moved in a direction toward the drive unit.

[0018] Particularly preferably, the locking unit has at least one support element, in particular a support plate, against which the return element and the locking element rest. The support element is designed to support at least the return element and the locking element. Furthermore, the support element is arranged on the output shaft and is axially movable relative to the output shaft. In one embodiment, the support element can have at least one receptacle for receiving the output shaft, the return element and / or the locking element. In particular, the support element can have a through-opening as a receptacle for the output shaft. Furthermore, the support element comprises at least one first support surface for supporting the return element. The return element rests axially on the support element and is acted upon by the return element.The support element also has at least one second support surface for supporting the locking element. The second support surface receives the locking element so that the locking element rests axially against the support element. The support element applies axial pressure to the locking element. If the locking element is moved from the locking position to the unlocking position, the support element is moved essentially in the same direction. The locking element and the support element perform a coupled movement. The support element can be annular or star-shaped, for example, although comparable designs are also conceivable.

[0019] Most preferably, the support element, in particular the support plate, is cup-shaped. In this embodiment, the first support surface is arranged axially and radially offset relative to the second support surface.

[0020] In an alternative embodiment, it is conceivable that the first support surface is arranged radially or axially offset relative to the second support surface.

[0021] Advantageously, the locking unit comprises at least one actuating element that receives the locking element, in particular in a form-fitting manner. In one embodiment, the actuating element is designed as an actuating sleeve. The actuating element is configured to be actuated by the user. In particular, by actuating the actuating element, the user can move the locking element from the locking position to the unlocking position. For this purpose, in one embodiment, the actuating element comprises an outer gripping region that the user can grasp. In one embodiment, the actuating element can be designed to be heat-insulating, thus enabling little, in particular essentially no, heat exchange between the locking element and the actuating element. This then enables the user to touch the actuating element, regardless of the duration of use of the hand-held power tool.In particular, in one embodiment, the actuating element has at least one bearing element, in particular a bearing rib, at least for supporting the locking element.

[0022] It is conceivable for the actuating element to receive the support element in a force-locking manner. For this purpose, the actuating element can, for example, have snap hooks or a bayonet mount to establish the force-locking connection.

[0023] In a particularly advantageous manner, the actuating element has an at least partially circumferential collar and the locking element has an at least partially circumferential shoulder. The shoulder bears axially against the collar. In one embodiment, the collar is arranged in a direction pointing away from the drive unit. In particular, the collar and the actuating element can be formed integrally. In one embodiment, the shoulder is formed on the locking element. In particular, the collar and the shoulder are designed to fit one another, in particular complementarily, so that they can be connected to one another in a form-fitting manner. The collar is shaped such that the shoulder bears axially against the collar and the locking element is essentially axially movable when the actuating element is moved axially. In an alternative embodiment, it is conceivable for the collar and the shoulder to be connected in a force-fitting manner.

[0024] In a very advantageous manner, at least a portion of the locking element projects at least partially beyond the actuating element in an axial direction pointing away from the drive unit. In one embodiment, the locking element then forms at least a partially circumferential shoulder relative to the actuating element. This ensures that the contact surface of the locking element is at least partially offset relative to the actuating element. This enables the second insert tool to be placed securely and reliably against the contact surface. In particular, the portion of the locking element prevents direct contact between the second insert tool, in particular the connecting element of the second insert tool, and the actuating element.Due to the axial projection of at least one section of the locking element relative to the actuating element, it can be ensured that the axial forces during operation of the handheld power tool can be controlled and directly transmitted to the output shaft via the locking element. This design provides a reliable connection between the second insert tool and the locking element, regardless of the manufacturer of the second insert tool.

[0025] Preferably, the support element and the actuating element form a clamped connection by means of a fastening element of the locking unit. This securely and reliably connects the support element to the actuating element. In particular, it is ensured that when the user actuates the actuating element, the support element is also actuated. In one embodiment, the support element is clamped between the fastening element and the actuating element. Typical fastening elements include, for example, a C-ring, a wedge, or other comparable fastening elements.

[0026] Particularly preferably, the actuating element at least partially accommodates the fastening element to form the clamping connection, wherein the fastening element bears against the support element. In one embodiment, the fastening element is received by the actuating element in a form-fitting and / or force-fitting manner. As a result, the support element can then be clamped to the actuating element and the locking element by means of the fastening element. In particular, the fastening element can hold the support element to the actuating element and simultaneously fix the support element to the locking element. In addition, the locking unit, in particular the actuating element, has at least one fixing element that fixes the fastening element, in particular axially. The fixing element can be designed as at least one projection, a hook or the like.For example, one, three, six or more than six fixing elements can be formed on the actuating element.

[0027] In an advantageous embodiment, the actuating element has at least a first internal receptacle for receiving the locking element, a second internal receptacle for receiving the support element, and a third internal receptacle for receiving the fastening element. For this purpose, the locking element is designed to fit, in particular complementarily, to the first internal receptacle. In particular, the first internal receptacle receives the locking element in a form-fitting and / or force-fitting manner. The second internal receptacle additionally comprises an at least partially circumferential shoulder. The support element is designed to fit, in particular complementarily, to the second internal receptacle. The second internal receptacle can receive the support element in a form-fitting and / or force-fitting manner, wherein the support element can additionally bear against the shoulder. Therefore, the support element bears radially and axially against the actuating element by means of the second internal receptacle.The fastening element is designed to fit, in particular complement, the third internal receptacle. The third internal receptacle accommodates the fastening element in a form-fitting and / or force-fitting manner.

[0028] According to the invention, the locking unit has at least one locking body, wherein the locking element locks the locking body. The locking element is movable at least axially and the locking body is movable at least radially. In particular, in one embodiment, the locking element locks the locking body in the locking position. Furthermore, the locking body locks the first insert tool in the locking position. When the locking element is moved axially into the unlocking position, the locking body is unlocked. In the unlocking position, in one embodiment, the locking body is movable radially, and the first insert tool can be removed from the polygonal internal receptacle.

[0029] The locking element is designed as a locking ring, and in a particularly preferred embodiment, the locking body is designed as at least one locking pin. It is also conceivable for the locking body to be designed as at least one locking bolt or a locking ball. Short description of the drawings

[0030] The invention is explained below using preferred embodiments.

[0031] The drawings below show: Fig. 1 a schematic view of a hand-held power tool according to the invention with a tool holder; Fig. 2 a sectional view of the tool holder of the hand tool; Fig. 3 an exploded view of the tool holder of the hand tool; Fig. 4a a perspective view of a locking element; Fig. 4b a perspective view of a support element; Fig. 4c a perspective view of an actuating element; Fig. 5 a sectional view of the tool holder with a second insert tool; Description of the embodiments

[0032] Fig. 1 shows a handheld power tool 100 according to the invention, wherein it is designed here as an exemplary cordless impact wrench. The handheld power tool 100 comprises an output shaft 124, a tool holder 150, and an exemplary impact mechanism 122, e.g., a rotary or rotating impact mechanism. The handheld power tool 100 has a housing 110 with a handle 126. The handheld power tool 100 can be mechanically and electrically connected to a power supply for battery operation to form a mains-independent power supply, so that the handheld power tool 100 is designed as a battery-operated handheld power tool 100. A handheld power tool battery pack 130 serves as the power supply here. However, the present invention is not limited to battery-operated handheld power tools, but can also be applied to mains-dependent, i.e., mains-operated, handheld power tools or pneumatically operated handheld power tools.In this embodiment, the hand-held power tool 100 comprises a tool axis 134. The tool axis 134 is designed here as a rotation axis 136 of the output shaft 124.

[0033] The housing 110 illustratively comprises a drive unit 111 and the impact mechanism 122. The drive unit 111 further comprises an electric drive motor 114, which is supplied with power by the handheld power tool battery pack 130, and a gear mechanism 118. The gear mechanism 118 can be designed as at least one planetary gear mechanism. The drive motor 114 is designed such that it can be actuated, for example, via a handset 128, so that the drive motor 114 can be switched on and off. The drive motor 114 can be any motor type, such as an electronically commutated motor or a DC motor. Advantageously, the drive motor 114 is electronically controllable and / or regulated, so that reversing operation and a desired rotational speed can be achieved. The structure and function of a suitable drive motor are well known to those skilled in the art, which is why they will not be discussed in detail here.

[0034] The gear 118 is connected to the drive motor 114 via a motor shaft 116. The gear 118 is designed to convert rotation of the motor shaft 116 into rotation between the gear 118 and the impact mechanism 122 via a drive member 120, for example, a drive shaft. This conversion preferably occurs such that the drive member 120 rotates relative to the motor shaft 116 with increased torque but at a reduced rotational speed. Illustratively, a motor housing 115 is assigned to the drive motor 114, just as a gear housing 119 is assigned to the gear 118. The motor housing 115 and the gear housing 119 are arranged, for example, in the housing 110. However, it is also conceivable that the drive motor 114 and the gear 118 can be arranged directly in the housing 110 if the handheld power tool 100 is designed in an "open frame" design.

[0035] The impact mechanism 122 is connected to the drive member 120 and comprises, for example, an impact body 125 that generates sudden rotational impulses of high intensity. These sudden rotational impulses are transmitted via the impact body 125 to the output shaft 124, for example, a work spindle. The impact mechanism 122 comprises an impact mechanism housing 123; see Fig. 3 , wherein the striking mechanism 122 can also be arranged in another suitable housing, such as the gear housing 119.

[0036] The exemplary impact mechanism 122 is designed to drive the output shaft 124. A tool holder 150 is provided on the output shaft 124. The tool holder 150 is preferably formed and / or formed on the output shaft 124. In this embodiment, the tool holder 150 is arranged in an axial direction 132 pointing away from the drive unit 111. In this embodiment, the tool holder 150 is assigned a locking unit 160 for locking a first insert tool 140. The output shaft 124 is preferably formed integrally with the tool holder 150. The tool holder 150 comprises a polygonal internal receptacle 152 for connection to the first insert tool 140, see also Fig. 2 and 3 . In addition, the tool holder 150 comprises a polygonal external receptacle 156 for connection to a second insert tool 144, see also Fig. 2 , 3 and 5. In this embodiment, the polygonal inner receptacle 152 is shaped like a bit holder with a hexagon socket receptacle 154 and is designed to receive the first insert tool 140 like a screwdriver bit. The first insert tool 140 has a matching external hexagon coupling 142 for this purpose. The type of screwdriver bit, for example, of the HEX type, is well known to those skilled in the art. However, the present invention is not limited to the use of HEX screwdriver bits; rather, other first insert tools that appear appropriate to those skilled in the art can also be used, such as HEX drills or SDS quick insert tools. In this embodiment, the polygonal outer receptacle 156 is designed as an external square receptacle 158. The external square receptacle 158 is designed to receive second insert tools 144 with an internal square receptacle 146, such as a socket wrench.Such a socket wrench with a square socket is sufficiently known from the state of the art.

[0037] Furthermore, the handheld power tool 100 according to the invention has a maximum length of a rotary impact unit of 140 mm, in particular a maximum of 130 mm, very particularly a maximum of 120 mm. The rotary impact unit comprises the drive unit 111, the impact mechanism 122, and the locking unit 160. The length of the rotary impact unit from a front end of the locking unit 160 to a rear end 117 of the motor shaft 116 of the drive unit 111 is a maximum of 140 mm, in particular 130 mm, very particularly 120 mm. In this embodiment, the front end of the locking unit 160 is a contact surface 168 of a locking element 162.

[0038] In Fig. 2 A sectional view of the tool holder 150 of the handheld power tool 100 according to the invention is shown. In the axial direction 132 pointing away from the drive unit 111, the output shaft 124 according to this embodiment has an axial extension 220. This is preferably molded onto the tool holder 150 and, in this embodiment, is formed integrally therewith. The axial extension 220 has a preferably elastically deformable holding element 222. This illustratively comprises a fixing member 224, which is preferably designed as an elastically deformable, metal C-ring.

[0039] The locking unit 160 has the locking element 162, see also Fig. 4a . The locking element 162 comprises at least one locking body 166, see also Fig. 3 . The locking element 162 is designed in this embodiment as a locking ring 164. The locking body 166 is designed as a locking pin, wherein the locking unit 160 comprises two locking pins, see also Fig. 3 The locking element 162 cooperates with the locking body 166, wherein the locking body 166 is mounted for radial displacement. In a locking position, the locking element 162 locks the locking body 166, so that the first insert tool 140 is locked in the polygonal internal receptacle 152 via the locking body 166. In an unlocking position, the locking element 162 unlocks the locking body 166, allowing it to move radially. In the unlocking position, the first insert tool 140 can be removed from the polygonal internal receptacle 152.

[0040] Furthermore, the locking element 162 comprises the contact surface 168 against which the second insert tool rests. In this embodiment, the contact surface 168 is formed on the locking element 162 in the axial direction 132 pointing away from the drive unit 111 and is formed by an end face of the locking element 162. The second insert tool 144 rests against the contact surface 168 of the locking element 162. In addition, the locking element 162 has a section 165 that partially projects beyond the actuating element 190 in the axial direction 132 pointing away from the drive unit 111.

[0041] In this embodiment, the locking unit 160 comprises a fixing element 170 against which the locking element 162 rests. This transmits axial forces absorbed by the locking element 162 to the output shaft 124. The locking element 162 rests directly and immediately axially against the fixing element 170. The fixing element 170 is formed as a metal C-ring. The fixing element 170 is arranged on the output shaft 124 and is positively connected thereto. The output shaft 124 comprises a receptacle 172 for receiving the fixing element 170. The receptacle 172 is formed as a circumferential groove.

[0042] The locking unit 160 also has a return element 174, which is designed here as a spiral spring. The return element 174 rests axially against the fixing element 170. The return element 174 exerts axial pressure on the fixing element 170. Furthermore, the return element 174 is movably arranged on the output shaft 124, with the output shaft 124 receiving the return element 174.

[0043] The locking unit 160 comprises a support element 180, against which the return element 174 and the locking element 162 rest. The support element 180 supports the return element 174 and the locking element 162. The support element 180 is designed as a support plate. Furthermore, the support element 180 is arranged on the output shaft 124 and is axially movable relative to the output shaft 124. The support element 180 comprises receptacles 182, 184, 186 for receiving the output shaft 124, the return element 174, and the locking element 162. See also Fig. 4b . The receptacle 182 of the support element 180 for the output shaft 124 is designed as a through-opening 183, see also Fig. 4b . The receptacle 184 of the support element 180 for the return element 174 is formed as a first support surface 185, see also Fig. 4b . The receptacle 186 of the support element 180 for the locking element 162 is designed as a second support surface 187, see also Fig. 4b . In this embodiment, the support element 180 is cup-shaped, see also Fig. 4b Here, the first support surface 185 is arranged axially and radially offset relative to the second support surface 187, see also Fig. 4b .

[0044] Furthermore, the locking unit 160 comprises an actuating element 190, which positively receives the locking element 162. The actuating element 190 is designed as an actuating sleeve, see also Fig. 4c . The actuating element 190 includes an outer gripping portion 192 that a user can grasp. Furthermore, the actuating element 190 includes bearing elements 194 that support the locking element 162 on the actuating element 190. See Fig. 4c . The bearing elements 194 are formed as bearing ribs 196.

[0045] In this embodiment, the actuating element 190 comprises a circumferential collar 198, see also Fig. 4c . In addition, the locking element 162 comprises a circumferential shoulder 163, see also Fig. 4a The shoulder 163 rests axially against the collar 198. The collar 198 is formed integrally with the actuating element 190. The shoulder 163 is formed on the locking element 162. The collar 198 and the shoulder 163 are formed to fit, in particular complement, each other, so that they can be connected to each other in a form-fitting manner.

[0046] The locking unit 160 has a fastening element 200. The support element 180 and the actuating element 190 form a clamping connection by means of the fastening element 200. The fastening element 200 is formed as a metal C-ring. The support element 180 is clamped between the fastening element 200 and the actuating element 190. In addition, the fastening element 200 fixes the support element 180 to the actuating element 190, so that the support element 180 bears against the actuating element 190. In this embodiment, the actuating element 190 receives the fastening element 200 in a form-fitting manner to form the clamping connection. Furthermore, the actuating element 190 has fixing elements 202 to fix the fastening element 200 axially, see also Fig. 4c . The fixing elements 202 are formed as three projections 204.

[0047] The actuating element 190 comprises a first internal receptacle 206 for receiving the locking element 162, a second internal receptacle 208 for receiving the support element 180 and a third internal receptacle 210 for receiving the fastening element 200, see also Fig. 4c The first internal receptacle 206 is formed as an internal receptacle surface 207, wherein the first internal receptacle 206 additionally forms the bearing elements 194. The second internal receptacle 208 is formed as a circumferential groove. In addition, the second internal receptacle 208 forms a circumferential shoulder. The support element 180 is received by the groove of the second internal receptacle 208 and rests against the shoulder of the second internal receptacle 208. As a result, the support element 180 rests radially and axially against the actuating element 190 by means of the second internal receptacle 208. The third internal receptacle 210 is formed as a circumferential groove. The fastening element 200 is received by the third internal receptacle 210 and axially fixed by means of the fixing elements 202.

[0048] In Fig. 3 An exploded view of the tool holder 150 with the locking unit 160 of the handheld power tool 100 is shown. The output shaft 124 additionally includes a shaft seal 212, a plain bearing 214, and an axial spacer element 216. Fig. 4a a perspective view of the locking element 162 is shown, wherein Fig. 4b a perspective view of the support element 180. In Fig. 4c a perspective view of the actuating element 190 is shown.

[0049] In Fig. 5A sectional view of the tool holder 150 is shown in a connected state with the second insert tool 144. To connect the second insert tool 144 to the polygonal external receptacle 156, 158, the second insert tool 144 includes a connecting element 148. The connecting element 148 is formed at a rear end 149 of the second insert tool 144. In the connected state, the second insert tool 144 rests directly against the contact surface 168 of the locking element 162.

Claims

1. Hand-held power tool (100) having a drive unit (111) and having an output shaft (124) on which is formed a tool holder (150) that has a polygonal socket (152) for connecting to a first insert tool (140), and a polygonal outer receptacle (156) for connecting to a second insert tool (144), wherein the tool holder (150) is assigned a locking unit (160) for locking the first insert tool (140), wherein the locking unit (160) comprises at least one locking element (162) which is designed as a locking ring (164), and the locking unit (160) has at least one locking member (166), wherein the locking ring (164) has at least one contact face (168) which is provided for axially supporting the second insert tool (144), characterized in that the locking ring (164) is provided for locking the locking member (166), wherein the locking element (162) interacts with the locking member (166), wherein the locking member (166) is mounted so as to be radially displaceable, and in a locking position the locking element (162) locks the locking member (166) in such a way that the first insert tool (140) is locked via the locking member (166) in the polygonal socket (152).

2. Hand-held power tool (100) according to Claim 1, characterized in that the locking member (166) locks the first insert tool (140) radially, and the second insert tool (144) rests axially on the locking ring (164).

3. Hand-held power tool (100) according to Claim 1 or 2, characterized in that the locking unit (160) has at least one fixing element (170) on which the locking ring (164) rests and which directs axial forces into the output shaft (124).

4. Hand-held power tool (100) according to Claim 3, characterized in that the locking unit (160) comprises at least one restoring element (174), in particular a spring element, wherein the restoring element (174), in particular, rests axially on the fixing element (170), and the restoring element (174) at least restores the locking ring (164) from an unlocking position in which the first insert tool (140) is able to be unlocked, to a locking position in which the first insert tool (140) is able to be locked.

5. Hand-held power tool (100) according to Claim 4, characterized in that the locking unit (160) has at least one support element (180), in particular a support plate, on which the restoring element (174) and the locking ring (164) rest.

6. Hand-held power tool (100) according to Claim 5, characterized in that the support element (180), in particular the support plate, is designed to be pot-shaped.

7. Hand-held power tool (100) according to one of the preceding claims, characterized in that the locking unit (160) has at least one activation element (190) which receives the locking ring (164), in particular in a form-fitting manner.

8. Hand-held power tool (100) according to Claim 7, characterized in that the activation element (190) has an at least partially encircling collar (198), and the locking ring (164) has an at least partially encircling shoulder (163), wherein the shoulder (163) rests axially on the collar (198).

9. Hand-held power tool (100) according to Claim 7 or 8, characterized in that at least one portion (165) of the locking ring (164) protrudes at least partially beyond the activation element (190) in an axial direction (132) pointing away from the drive unit (111).

10. Hand-held power tool (100) according to one of Claims 5 to 9, characterized in that the support element (180) and the activation element (190) by means of a fastening element (200) of the locking unit (160) form a clamping connection.

11. Hand-held power tool (100) according to Claim 10, characterized in that, for forming the clamping connection, the activation element (190) receives the fastening element (200) at least partially, wherein the fastening element (200) rests on the support element (180).

12. Hand-held power tool (100) according to one of the preceding claims, characterized by a rotary percussion unit having a length of at most 140 mm, in particular at most 130 mm, very particularly at most 120 mm, wherein the rotary percussion unit comprises the drive unit (111), at least one percussion mechanism (122) and the locking unit (160).

13. Hand-held power tool (100) according to one of the preceding claims, characterized in that the locking ring (164) is disposed radially between the locking member (166) and the activation element (190).