Hand-held power tool
The hand-held power tool addresses the challenge of single-handed tool locking by incorporating an axially movable locking element within a locking unit, facilitating secure and efficient tool changes without needing two hands.
Patent Information
- Authority / Receiving Office
- WO · WO
- Patent Type
- Applications
- Current Assignee / Owner
- ROBERT BOSCH GMBH
- Filing Date
- 2025-12-02
- Publication Date
- 2026-06-25
Smart Images
Figure EP2025085129_25062026_PF_FP_ABST
Abstract
Description
[0001] R. 415390 IP1
[0002] - 1 -
[0003] Description
[0004] title
[0005] hand-held power tool
[0006] The present invention relates to a hand-held power tool according to the preamble of claim 1.
[0007] State of the art
[0008] From DE 102018203 522 A1 a hand-held machine tool with a drive unit and with a tool holder having a multi-sided internal holder and a multi-sided external holder is already known.
[0009] Disclosure of the invention
[0010] The present invention relates to a hand-held power tool with a drive unit, with an output shaft driven by the drive unit, on which a tool holder is formed, which has a polygonal inner receptacle for connection with a first insert tool and a polygonal outer receptacle for connection with a second insert tool, and with a locking unit for locking at least the first insert tool, which is associated with the tool holder, wherein the locking unit has a locking element for locking at least one locking element, an actuating sleeve for actuating the locking unit, at least one reset element at least for resetting the locking unit from a release position to a locking position, at least one support element at least for supporting the reset element and at least one fixing element for fixing the support element.It is proposed that the locking element be movable essentially axially about a rotational axis of the tool holder. R. 415390 IP1.
[0011] - 2 -
[0012] The invention provides a compact hand-held power tool in that the locking element is essentially movable axially to the axis of rotation.
[0013] The hand-held power tool can be electrically powered. This electrically powered power tool can be either mains-powered or battery-powered. For example, the hand-held power tool can be a screwdriver, a drill / driver, an impact drill / driver, an impact wrench, or a rotary impact wrench.
[0014] The housing of the hand-held power tool is designed to at least partially accommodate the drive unit and the tool holder. The housing can be designed as a shell housing with two half-shells.
[0015] The hand-held power tool includes a drive unit. The drive unit comprises a drive motor and a gearbox. The drive motor can be an electrically commutated drive motor. In particular, the drive motor can be designed as at least one electric motor. The drive motor is designed such that it can be operated via a hand switch. When the hand switch is activated by a user, the drive motor is switched on and the hand-held power tool is put into operation. If the hand switch is no longer activated by the user, the drive motor is switched off. Preferably, the drive motor is electronically controllable and / or regulated in such a way that reversing operation and setting a desired rotational speed are possible. In reversing operation, the drive motor can be switched between clockwise and counterclockwise rotation.For switching the drive motor in reversing mode, the hand-held power tool may have a direction-of-rotation switching element, in particular a direction-of-rotation switch.
[0016] The drive motor has a drive shaft. The drive shaft is supported in the housing by means of at least one drive shaft bearing. The drive motor can drive the gearbox, a percussion mechanism, and / or the tool holder via the drive shaft. The drive shaft bearing can be, for example, a ball bearing, a needle bearing, a roller bearing, or a plain bearing. The drive shaft is designed to R. 415390 IP1
[0017] - 3 - to drive the transmission. The transmission can be designed as at least one planetary gear set, and it can, for example, be switchable. In a switchable transmission, switching between at least two gear stages is possible by means of at least one gear-shifting element, in particular a gear-shifting switch. The transmission can have a transmission housing and a transmission cover. The transmission can have a ring gear. The ring gear can bear against the transmission housing, in particular axially. The transmission cover is designed to close the transmission housing, at least partially. In addition, the transmission cover is designed to engage at least partially with the ring gear. The transmission cover is designed to engage at least partially with an inner circumference of the ring gear.
[0018] The hand-held power tool may include a percussion mechanism. During operation, the percussion mechanism generates high torque peaks to loosen or tighten fasteners, or to drill holes. The percussion mechanism may be connected to the drive motor via a gearbox. The percussion mechanism may be designed, for example, as a rotary percussion mechanism, a ratchet percussion mechanism, a rotary percussion mechanism, a V-groove percussion mechanism, or a hammer percussion mechanism. The gearbox and / or the percussion mechanism may include an intermediate shaft. For example, the intermediate shaft may accommodate planetary gears of the gearbox. It is possible that the intermediate shaft includes a planet carrier to hold the planetary gears of the planetary gearbox. Furthermore, the intermediate shaft may at least partially drive the percussion mechanism. The percussion mechanism may include a percussion housing and / or a percussion cover.It is possible that the gearbox housing and the impact mechanism housing, as well as the gearbox cover and the impact mechanism cover, are all one piece. The intermediate shaft can be driven by the gearbox.
[0019] The hand-held power tool has an output shaft that can be driven by the drive unit, the intermediate shaft, and / or the impact mechanism. The tool holder is formed on the output shaft. The tool holder has a multi-sided internal recess and a multi-sided external recess. The multi-sided internal recess is designed to hold the first tool. The multi-sided internal recess can, for example, be a hexagonal socket, such as a bit holder, so that the first tool can be inserted, for example, into R. 415390 IP1.
[0020] - 4 -
[0021] The tool holder can accommodate a screwdriver bit. The multi-sided external mount can be designed, for example, as a square drive, such as a socket. This allows for the use of a second tool, such as a socket wrench, a socket, or a drive socket. The hand-held power tool can have a tool axis. The axis of rotation of the tool holder can form the tool axis. "Axial" should be understood as essentially parallel to the tool axis, while "radial" should be understood as essentially perpendicular to the tool axis. The tool holder can be rotatably mounted in the impact mechanism housing and / or the gearbox housing by means of a tool holder bearing element. The tool holder bearing element can be designed, for example, as a plain bearing, a roller bearing, a needle bearing, or at least a ball bearing.It is possible that the tool holder has, for example, two or three tool holder bearing elements.
[0022] The power tool also includes a power supply, which is designed for battery operation using rechargeable batteries, in particular 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 "power tool battery pack" is understood to be an assembly of at least one battery cell and a battery pack housing. The power tool battery pack is advantageously designed to supply power to commercially available battery-operated power tools. The at least one battery cell can, for example, be a lithium-ion battery cell with a nominal voltage of 3.6 V. By way of example, the power tool battery pack can comprise up to ten battery cells, although a different number of battery cells is also conceivable.Both battery-powered and mains-powered versions of the device are well known to those skilled in the art, therefore the details of the power supply will not be discussed here. R. 415390 IP1.
[0023] - 5 -
[0024] The hand-held power tool may have a control unit, at least for controlling the drive unit. The control unit may be located in the housing, for example in a handle of the hand-held power tool or in the area of a power supply interface.
[0025] The hand-held power tool includes a locking unit. The locking unit is designed to lock at least the first tool. The locking unit is associated with the tool holder. The locking unit comprises the locking element, the detent element, the actuating sleeve, the return element, the support element, and the securing element. The locking unit can be arranged and / or configured circumferentially around the tool holder. The locking element is designed to lock the detent element. The locking element can, for example, be configured as a locking sleeve. The locking element can have a contact surface for the second tool. The contact surface can be annular.The contact surface can be designed such that the second tool can rest against it and be spaced apart from the actuating sleeve and / or a stop of the polygonal outer mount. The locking element is designed to lock at least the first tool in the tool holder, so that the first tool is locked in the tool holder during use of the hand-held power tool. The locking element can act on the first tool essentially radially. The locking element can be arranged radially between the polygonal inner mount for the first tool and the locking element. The locking element can also be arranged radially between the locking element and the actuating sleeve. The locking element can be designed, for example, as at least one ball or at least one bolt. It is possible for two or three locking elements to be provided.The locking element is essentially axially movable relative to the axis of rotation of the tool holder, although it is also conceivable that it is essentially parallel to the axis of rotation. "Essentially axial" is intended to mean within a range of up to 20° relative to the axis of rotation. Similarly, "essentially parallel" is intended to mean within a range of up to 20° relative to the axis of rotation. The locking element can, for example, have a diameter of [greater than R. 415390 IP1].
[0026] - 6 - 3.5 mm. The actuating sleeve is designed to actuate the locking unit when a user actuates the actuating sleeve. The user can actuate the actuating sleeve. The actuating sleeve can be designed in the form of a sleeve. The actuating sleeve can have a receptacle for the locking element. The actuating sleeve can receive the locking element by positive locking, force locking, and / or material locking. The locking element can bear against the actuating sleeve. The locking element can bear against the actuating sleeve axially, radially, and / or circumferentially. The fixing element is designed to fix the support element relative to the tool holder. The fixing element can be connected to the tool holder. The tool holder can have a groove that is at least partially circumferential.The locking element is designed to engage in the at least partially circumferential groove of the tool holder. The locking element can be, for example, a snap ring, a C-ring, or the like. The support element can bear against the locking element in at least one position, for example, the locking position. In the release position, the locking element and the support element can be spaced apart from each other. The reset element is designed to return the locking unit from the release position to the locked position. In the release position, the locking element releases the detent element, allowing the first tool to be inserted into and / or removed from the multi-sided internal recess. In the locked position, the locking element engages the detent element, locking the first tool in the multi-sided internal recess.The return element can be arranged circumferentially around the tool holder, in particular the multi-sided internal recess. The return element can be designed as a spring element, such as a coil spring or a helical spring. The support element is designed to at least support the return element and thereby absorb forces, in particular axial forces. The return element can act on the locking element via the support element and / or the locking element. The support element can be arranged adjacent to the locking element. The return element can be arranged axially between the locking element and the support element. The return element can abut the support element. The support element can abut the actuating sleeve. The support element can be designed, for example, as a cup, shell, ring, or sleeve. R. 415390 IP1.
[0027] - 7 -
[0028] The support element can be designed, for example, as a ring, a washer, or a sleeve with a receptacle for the return element. The support element can be radially centered via the actuating sleeve or the tool holder.
[0029] The locking unit is designed so that the user can insert and lock the first tool into the multi-sided internal recess using only one hand. Essentially, no second hand is required to lock the first tool in the multi-sided internal recess. The user inserts the first tool into the multi-sided internal recess, and the locking element is thereby displaced both axially and radially, allowing the first tool to be inserted. Thus, the locking unit enables the first tool to be locked with just one hand.
[0030] In one embodiment of the hand-held power tool, the tool holder has at least one locking receptacle that is formed substantially axially to the axis of rotation. The locking receptacle is designed to receive the locking element. The locking receptacle receives the locking element in such a way that the locking element is movable substantially axially and substantially radially. When the first tool is inserted into the polygonal internal receptacle, the locking element initially moves substantially axially until it can be received into a receptacle of the locking element, thus enabling further movement substantially radially. The first tool can then be inserted substantially completely into the polygonal internal receptacle by means of a connecting area of the first tool and thus locked in place by the locking element.This can be achieved by moving the locking element essentially axially again towards the polygonal outer receptacle and engaging it in a locking recess of the first insert tool. The locking receptacle can, for example, be designed as a recess in which the locking element can be arranged. The locking receptacle can be designed such that the locking element is essentially permanently arranged in the locking receptacle. When the locking element is arranged in the locking receptacle, it at least partially engages in the polygonal inner receptacle. R. 415390 IP1.
[0031] - 8 -
[0032] In one embodiment of the hand-held power tool, the locking unit comprises at least one locking spring element designed to actuate the locking element at least axially. The locking spring element acts upon the locking element at least axially, and can also act upon it substantially axially. It is also conceivable that the locking spring element acts upon the locking element at least partially radially. The locking spring element enables the locking element to be securely and reliably positioned in the locking receptacle, thereby securely and reliably locking the inserted first tool. The locking spring element can, for example, be a coil spring, a spring plate, a spring plate that is at least partially slotted, or a spring plate designed or arranged circumferentially around the tool receptacle or the output shaft.The spring plate can rest axially between two edges of the tool holder. Alternatively, the locking spring element can also be designed or arranged as a compression spring circumferentially around the tool holder or the output shaft. The compression spring or coil spring can rest against an edge of the tool holder in the direction of the drive unit and axially against the locking element in the direction of the polygonal outer mount.
[0033] In one embodiment of the hand-held power tool, the tool has a fixing unit designed to secure the locking unit to the tool holder. The fixing unit secures the locking unit to the tool holder, ensuring safe and reliable operation. The fixing unit can be arranged radially between the polygonal inner mount and the locking element.
[0034] In one embodiment of the hand-held power tool, the fixing unit has at least one fixing element designed to support the return element. The fixing element can, for example, be designed in the form of a ring or a sleeve. The return element can bear against the fixing element. The fixing element can absorb axial forces from the return element and transmit them into the output shaft. The return element can be arranged, particularly axially, between the support element and the fixing element. The fixing element can have a rib that is at least partially circumferential or a ring that is at least partially circumferential. 415390 IP1
[0035] - 9 -
[0036] The locking element may have a collar. The return element may rest against the bridge or the collar. The fixing element may be arranged at least partially radially between the locking spring element and the locking element. The locking spring element may be arranged at least partially radially between the polygonal inner receptacle and the fixing element. The fixing element may have a receptacle for the locking element. The receptacle for the locking element may be designed such that the locking element is movable and simultaneously lockable by the locking element. The receptacle for the locking element may, for example, be U-shaped, V-shaped, C-shaped, or L-shaped.
[0037] In one embodiment of the hand-held power tool, the locking element rests at least partially against the fixing element. In the locked position, the locking element can rest against the fixing element. In the released position, the locking element can be at least axially spaced from the fixing element. The locking element can rest against the web or collar of the fixing element. The web or collar of the fixing element can be arranged axially between the return element and the locking element.
[0038] In one embodiment of the hand-held power tool, the clamping unit has at least one locking element designed to absorb at least axial forces from the return element. The locking element can be, for example, a ball, a pin, or a bolt. At least one locking element is required, although more than one is conceivable, such as two or three. The tool holder can have a locking receptacle. The locking element can be designed to engage with the locking receptacle. The locking receptacle can be, for example, cup-shaped, bowl-shaped, or recess-shaped. The locking element can be at least partially located within the locking receptacle. The forces from the return element can then be transmitted via the locking element and the locking receptacle into the tool holder and / or the output shaft.The fixing element may have a receptacle for the locking element. The locking element may be designed to support the fixing element. The receptacle for the locking element may, for example, be designed as a recess. R. 415390 IP1.
[0039] - 10 -
[0040] The receptacle for the locking element can be, for example, U-shaped, V-shaped, L-shaped, or C-shaped. The locking element can rest against the locking element. When the actuating sleeve is moved axially toward the polygonal outer receptacle, the locking element can block the locking element in such a way that the axial forces of the return element are transferred to the tool holder and / or the output shaft. The locking element can block the locking element both axially and circumferentially. The locking element can prevent the locking element from rotating. The locking element can be arranged adjacent to the locking element. The locking element can be arranged circumferentially between two locking elements. The locking element can be arranged circumferentially offset from the locking element by, for example, 70° to 120°.It is also possible that the spring plate has a recess into which the locking element engages. It is also possible that the fixing element rests against the locking element.
[0041] In one embodiment of the hand-held power tool, the tool has a centering element designed to center at least the return element relative to the tool holder. The centering element can be associated with the locking unit or the fixing unit. The centering element can be cylindrical or hollow. The return element can bear at least partially against the centering element. The centering element can center the return element relative to the tool holder, in particular the polygonal inner holder and / or polygonal outer holder, to prevent the return element from tilting. The centering element can be formed on an inner circumference of the locking element. It is also possible for the centering element to be formed on an outer circumference of the fixing element.
[0042] In one embodiment of the hand-held power tool, the actuating sleeve has at least one collar designed to at least partially support the support element. The collar of the actuating sleeve can be formed on the actuating sleeve in the direction of the drive unit. The collar can be formed radially inward, in the direction of the axis of rotation of the tool holder. The collar can be formed at least partially circumferentially. When the actuating sleeve is moved into the release position, operating forces can be transmitted through the R. 415390 IP1
[0043] - 11 -
[0044] The collar of the actuating sleeve is inserted into the support element, so that the locking unit can then be moved.
[0045] In one embodiment of the hand-held power tool, the locking unit has at least one connecting element designed to connect the actuating sleeve to the locking element. The connecting element joins the actuating sleeve and the locking element in such a way that the operating forces of the actuating sleeve can be transmitted to the locking element. The actuating sleeve can have a receptacle for the connecting element. The receptacle for the connecting element can be a groove that is at least partially circumferential. The connecting element can bear against both the actuating sleeve and the locking element. The connecting element can engage radially into the actuating sleeve. The connecting element can bear at least partially axially against the locking element. The connecting element can be designed, for example, as a snap ring, a ring, or a clip.
[0046] R. 415390 IP1
[0047] - 12 -
[0048] Brief description of the drawings
[0049] The invention is explained below with reference to preferred embodiments. The drawings below show:
[0050] Fig. 1 shows a schematic view of a hand-held power tool according to the invention;
[0051] Fig. 2 shows a section of a longitudinal section of a tool holder with a first embodiment of a locking unit of the hand-held power tool in a first view;
[0052] Fig. 3 shows a section of the longitudinal section of the tool holder with the first embodiment of the locking unit of the hand-held power tool in a second view;
[0053] Fig. 4 shows a perspective view of the tool holder of the section of the first embodiment;
[0054] Fig. 5a shows a section of a longitudinal section of a tool holder with a second embodiment of the locking unit of the hand-held power tool;
[0055] Fig. 5b shows a perspective view of the tool holder of the section of the second embodiment;
[0056] Fig. 6 shows a section of a longitudinal section of a tool holder with a third embodiment of the locking unit of the hand-held power tool;
[0057] Description of the exemplary implementations
[0058] Fig. 1 shows a hand-held power tool 100 according to the invention, which is designed as an exemplary cordless impact wrench 100. The hand-held power tool R. 415390 IP1
[0059] - 13 -
[0060] The power tool 100 comprises an output shaft 124 and a tool holder 150. The power tool 100 has a housing 110 with a handle 126. The power tool 100 can be mechanically and electrically connected to a power supply for battery operation, thus enabling the power tool 100 to be configured as a battery-powered power tool 100. A power tool battery pack 130 serves as the power supply in this case. However, the present invention is not limited to battery-powered power tools, but can also be applied to mains-powered, i.e., mains-operated, power tools.
[0061] The housing 110 includes a drive unit 111. The drive unit 111 is arranged within the housing 110. The drive unit 111 comprises an electrically commutated drive motor 114, which is powered by the power tool battery pack 130, and a gearbox 118. The gearbox 118 is designed as at least a planetary gearbox. The drive motor 114 is designed such that it can be operated, for example, via a hand switch 128, allowing the drive motor 114 to be switched on and off. Advantageously, the drive motor 114 is electronically controllable and / or adjustable, enabling reversing operation and a desired rotational speed. For reversing operation, the power tool 100 has a direction-of-rotation switching element 121, which is designed as a direction-of-rotation switch.The direction-of-rotation switching element 121 is designed to switch the drive motor 114 between a clockwise and a counterclockwise direction of rotation. The design and operation of a suitable drive motor are well known to those skilled in the art, and therefore will not be discussed in detail here.
[0062] The gearbox 118 is connected to the drive motor 114 via a drive shaft 116. The gearbox 118 is designed to convert a rotation of the drive shaft 116 into a rotation between the gearbox 118 and the tool holder 150. The gearbox 118 comprises a gearbox housing 119.
[0063] The hand-held power tool 100, designed as a cordless impact wrench, comprises a rotary impact mechanism 122 with an intermediate shaft 120. Both the rotary impact mechanism 122 and the intermediate shaft 120 are arranged in the housing 110. Preferably R. 415390 IP1
[0064] - 14 - The conversion from the rotation of the drive shaft 116 to a rotation of the tool holder 150 takes place via the intermediate shaft 120. The intermediate shaft 120 rotates relative to the drive shaft 116 with increased torque, but at a reduced rotational speed. The rotary impact mechanism 122 comprises an impact mechanism housing 123, whereby the rotary impact mechanism 122 can also be arranged in another suitable housing, such as the gearbox housing 119. The rotary impact mechanism 122 is designed to drive the output shaft 124. Furthermore, the gearbox housing 119 and the impact mechanism housing 123 are shown here as a single piece.
[0065] The hand-held power tool 100 comprises a tool axis 102, wherein a rotational axis of the tool holder 150 forms the tool axis 102. The tool holder 150 is provided on the output shaft 124. Preferably, the tool holder 150 is integrally formed and / or formed on the output shaft 124. Preferably, the tool holder 150 is arranged in an axial direction 132 pointing away from the drive unit 111. The tool holder 150 comprises a polygonal internal receptacle 152 for connection with a first insert tool 140 and a polygonal external receptacle 156 for connection with a second insert tool. The polygonal internal receptacle 152 is designed to receive the first insert tool 140. The polygonal internal receptacle 152 is designed as an internal hexagon socket 154, such as a bit holder. The first tool 140, for example, is designed as a screwdriver bit with a multi-sided external coupling 142.The polygonal external receptacle 156 of the tool holder 150 is designed as an external square receptacle 158, such as a socket holder. The second insert tool is not shown, but is designed as a socket. The tool holder 150 is rotatably mounted in the impact mechanism housing 123 and / or the gearbox housing 119 by means of at least one tool holder bearing element 190, see also Figs. 2, 3, 5a, 6. The tool holder bearing element 190 is shown here by way of example as two ball bearings.
[0066] The tool holder 150 is associated with a locking unit 200 for locking at least the first insert tool 140, see also Figs. 2 to 6. The locking unit 200 comprises a locking element 210 for locking at least R. 415390 IP1
[0067] - 15 - of a locking element 220, an actuating sleeve 230 for actuating the locking unit 200, at least one reset element 250 at least for resetting the locking unit 200 from a release position to a locking position, at least one support element 260 at least for supporting the reset element 250 and at least one fixing element 240 for fixing the support element 210, see also Figs. 2 to 6.
[0068] The hand-held power tool 100 has a control unit 170 for controlling at least the drive unit 111, in particular the drive motor 114. The housing 110 at least partially accommodates the control unit 170. The control unit 170 includes a microprocessor, which is not shown in detail.
[0069] Furthermore, the housing 110 includes a power supply holding device 160. The power supply holding device 160 accommodates the hand-held power tool battery pack 130 and forms a base 162 with a standing surface. The hand-held power tool battery pack 130 can be detached from the power supply holding device 160 without tools. The housing 110 also includes the handle 126 and the power supply holding device 160. The handle 126 can be gripped by the user. In one embodiment, the power supply holding device 160 is arranged on the handle 126. The hand-held power tool 100 can be set down using the base 162.
[0070] Fig. 2 shows a section 300 of a longitudinal section of the tool holder 150 with a first embodiment 301 of the locking unit 200 of the hand-held power tool 100 in a first view. The locking unit 200 is designed to lock at least the first insert tool 140, and the locking unit 200 is associated with the tool holder 150. The locking unit 200 is arranged circumferentially around the tool holder 150. The locking element 210 is designed to lock the detent element 220. By way of example, the locking element 210 is designed as a locking sleeve.
[0071] Here, the locking element 210 includes a contact surface for the second insert tool, the contact surface 214 being exemplarily shaped as a ring. The contact surface 214 is shaped such that the second insert tool rests on the contact surface. R. 415390 IP1
[0072] - 16 - before 214 is in contact with and spaced apart from the actuating sleeve 230 and / or a stop 159 of the polygonal outer receptacle 156. The locking element 220 acts on the first insert tool 140 essentially radially. The locking element 220 is arranged radially between the polygonal inner receptacle 152 for the first insert tool 140 and the locking element 210. The locking element 210 is arranged radially between the locking element 220 and the actuating sleeve 230. By way of example, the locking element 220 is designed as a locking ball, with two locking elements 220 being provided here. The locking element 220 is essentially axially movable about the axis of rotation 102 of the tool holder 150. The locking element 220 has, by way of example, a diameter greater than 3.5 mm. The actuating sleeve 230 is designed to actuate the locking unit 200. The actuating sleeve 230 is shaped like a sleeve.The actuating sleeve 230 includes a receptacle 232 for the locking element 210, which receives the locking element 210 in a form-fitting manner. The locking element 210 rests against the actuating sleeve 230. Here, the locking element 210 rests against the actuating sleeve 230 both radially and circumferentially. The fixing element 240 is designed to fix the support element 260 relative to the tool holder 150. The fixing element 240 is connected to the tool holder 150. For this purpose, the tool holder 150 includes a groove 242 that circumferentially extends at least partially. The fixing element 240 is designed to engage in the groove 242 of the tool holder 150 that circumferentially extends at least partially. The fixing element 240 is shown, by way of example, as a C-ring. The support element 260 rests against the fixing element 240 in at least one position, here the locking position. Fig.Figure 2 shows the locking unit 200 in the locked position. In the release position, the fixing element 240 and the support element 260 are spaced apart from each other. The reset element 250 is designed to return the locking unit 200 from the release position to the locked position. The locking element 210 is configured such that, in the release position, it releases the detent element 220. The first insert tool 140 can then be removed from the polygonal internal receptacle 152. The locking element 210 is configured such that, in the locked position, it locks the detent element 220, thereby locking the first insert tool 140 in the polygonal internal receptacle 152. R. 415390 IP1.
[0073] - 17 -
[0074] The reset element 250 is arranged circumferentially around the tool holder 150. For example, the reset element 250 is designed as a spring element, such as a coil spring. The support element 260 is designed to at least support the reset element 250 and to absorb forces, such as axial forces and / or operating forces. The reset element 250 is designed to act upon the locking element 240 via the support element 260. The reset element 250 is arranged axially between the locking element 210 and the support element 260. The reset element 250 rests against the support element 260. The support element 260 rests against the actuating sleeve 230. For example, the support element 260 is designed in a sleeve-like form, wherein the support element 260 here includes, for example, a receptacle 262 for the reset element 250. The receptacle 262 for the return element 250 is shown here as an example of a circumferential ridge.However, other forms are also conceivable, such as a collar that is at least partially circumferential, a projection, a groove that is at least partially circumferential, a shell, a ring, or the like. The tool holder 150 comprises at least one locking receptacle 222, which is formed substantially axially to the axis of rotation 102. The locking receptacle 222 is designed to receive the locking element 220, wherein the locking receptacle 222 receives the locking element 220 in such a way that the locking element 220 is movable substantially axially and substantially radially. The locking element 210 comprises a receptacle 216 for the locking element 220. The receptacle 216 for the locking element 220 is designed such that the locking element 220 is inserted at least partially radially into the receptacle 216 as soon as the locking element 220 is displaced substantially axially.As soon as the locking element 220 is at least partially inserted into the receptacle 216 for the locking element 220, the polygonal internal receptacle 152 is released, allowing the first insert tool 140 to be received. The first insert tool 140 can then be inserted essentially completely into the polygonal internal receptacle 152 by means of a connecting area 144 of the first insert tool 140. The first insert tool 140 includes a locking receptacle 146. The locking element 220 is designed such that it engages at least partially radially in the locking receptacle 146 and thus locks the first insert tool 140 in the polygonal internal receptacle 152. The locking receptacle 146 is, for example, formed as a recess, with the first insert tool 140 engaging the locking receptacle 146 as a circumferential projection. R. 415390 IP1.
[0075] - 18 - The locking unit 200 comprises at least one locking spring element 224. The locking spring element 224 is designed to act on the locking element 220 at least axially. In the first embodiment 301, the locking spring element 224 is designed as a coil spring 225. By way of example, two locking spring elements 224 are provided here, each of the locking spring elements 224 being assigned to one of the locking elements 220. The locking spring element 224 rests against the locking element 220 and the locking receptacle 222. The locking spring element 224 is arranged substantially axially between the locking element 220 and the locking receptacle 222.
[0076] The hand-held power tool 100 comprises a clamping unit 310. The clamping unit 310 is designed to clamp the locking unit 200 to the tool holder 150. The clamping unit 310 is arranged radially between the polygonal internal recess 152 and the locking element 210. The clamping unit 310 comprises at least one clamping element 312. The clamping element 312 is designed to support the return element 250. The clamping element 312 is, for example, shaped like a sleeve. The return element 250 bears against the clamping element 312, in particular at least axially, at least radially, and / or at least circumferentially. Furthermore, the return element 250 is arranged, in particular axially, between the support element 260 and the clamping element 312. The fixing element 312 includes a circumferential web 314. The return element 250 rests against the web 314 of the fixing element 312.The fixing element 312 is arranged at least partially radially between the locking spring element 224 and the locking element 210. Furthermore, the locking spring element 224 is arranged at least partially radially between the polygonal internal recess 152 and the fixing element 312. The fixing element 312 comprises a receptacle 316 for the locking element 220, wherein the receptacle 316 for the locking element 220 is shaped such that the locking element 220 is movable and can be locked by the locking element 220. For example, the receptacle 316 for the locking element 220 is U-shaped. The locking element 220 rests at least partially against the fixing element 312. In the locked position, the locking element 220 rests against the fixing element 312. The bridge 314 of the fixing element 312 is axially between the return element 250 and the locking element 210 R. 415390 IP1.
[0077] - 19 - arranged. The locking element 210 comprises a projection 212 that is at least partially circumferential for the fixing element 312. The fixing element 312 then rests against the projection 212 of the locking element 210 by means of the web 314.
[0078] The hand-held power tool 100 includes a centering element 320. The centering element 320 is designed to center at least the return element 250 relative to the tool holder 150. Here, the centering element 320 is shown as being associated with the locking unit 200. The centering element 320 is shaped like a hollow cylinder. The return element 250 rests at least partially against the centering element 320, with the centering element 320 centering the return element 250 relative to the tool holder 150. Here, the centering element 320 is formed on an inner circumference 218 of the locking element 210. The actuating sleeve 230 includes at least one collar 238. The collar 238 of the actuating sleeve 230 is designed to at least partially support the support element 260. The collar 238 of the actuating sleeve 230 is formed on the actuating sleeve 230 in the direction towards the drive unit 111.The collar 238 of the actuating sleeve 230 is formed radially inwards, in the direction of the axis of rotation 102 of the tool holder 150, and is formed circumferentially. The locking unit 200 comprises at least one connecting element 330. The connecting element 330 is designed to connect the actuating sleeve 230 to the locking element 210. The actuating sleeve 230 includes a receptacle 236 for the connecting element 330. The receptacle 236 for the connecting element 330 is formed, by way of example, as a circumferential groove. Here, the connecting element 330 rests against the actuating sleeve 230 and the locking element 210. The connecting element 330 engages radially in the actuating sleeve 230. The connecting element 330 rests, at least partially, axially against the locking element 210. By way of example, the connecting element 330 is formed as a snap ring.
[0079] Fig. 3 shows the section 300 of the longitudinal section of the tool holder 150 with the first embodiment 301 of the locking unit 200 of the hand-held power tool 100 in a second view. The second view is rotated 90° about the axis of rotation 102. The fixing unit 310 comprises at least one locking element 340. The locking element 340 is designed to at least the axial forces of the return- R. 415390 IP1
[0080] - 20 - lelements 250. By way of example, the locking element 340 is designed as a locking ball, with two locking elements 340 being provided by way of example. The tool holder 150 includes a locking receptacle 155, wherein the locking element 330 is provided to engage in the locking receptacle 155. By way of example, the locking receptacle 155 is shaped in the manner of a recess. The locking element 340 is arranged at least partially in the locking receptacle 155. By way of example, two locking receptacles 155 are provided, with each locking element 340 being assigned one locking receptacle 155. The fixing element 312 includes a receptacle 318 for the locking element 340. The locking element 340 is to be received in the receptacle 318 for the locking element 340. The locking element 340 is provided to support the fixing element 312. For example, the recess 318 for the blocking element 340 is shaped as a U-shaped recess.The fixing element 312 rests against the locking element 340. The locking element 340 is designed to block the fixing element 312 axially and circumferentially. A locking element 340 is arranged between each pair of locking elements 220 in the circumferential direction. By way of example, the locking element 220 is arranged offset from the locking element 340 in a circumferential direction within a range of 70° to 120°, see also Fig. 4. Fig. 4 shows a perspective view of the tool holder 150 of the cutout 300 of the first embodiment 301.
[0081] Fig. 5a shows a section 300 of a longitudinal section of the tool holder 150 with a second embodiment 302 of the locking unit 200 of the hand-held power tool 100. Fig. 5b shows a perspective view of the tool holder 150 of the section 300 of the second embodiment 302. For the second embodiment 302, only the differences from the first embodiment 301 are described below. The same reference numerals refer to the same features as in the first embodiment 301. The locking spring element 224 is designed here as a spring plate 226 that is at least partially slotted. The slotted spring plate 226 is arranged circumferentially around the tool holder 150 or the output shaft 124. The spring plate 226 rests axially between two edges 270 of the tool holder 150 or the output shaft 124. The spring plate 226 includes a stop 317 for the locking element 220.The stop 317 of the spring plate 226 limits the locking element 220 at least radially. The spring plate 226 includes a receptacle 319 for the blocking element 340. The receptacle 319 is for R. 415390 IP1.
[0082] - 21 - The locking element 340 is formed as a recess. The fixing element 312 rests against the locking element 340, with the axial forces on the fixing element being directed via the receptacle 319 for the locking element 340 of the spring plate 226, the locking element 340 and the receptacle 155 for the locking element 340 of the tool axis 150 into the tool axis 150. Accordingly, the fixing element 312 rests against the locking element 340 here.
[0083] Fig. 6 shows a section 300 of a longitudinal section of the tool holder 150 with a third embodiment 303 of the locking unit 200 of the hand-held power tool 100. Here, too, the same reference numerals correspond to the same elements as before. Here, the locking spring element 224 is designed as a compression spring 227. The compression spring 227 is arranged circumferentially around the tool holder 150 or the output shaft 124. The compression spring 227 rests against the edge 270 of the tool holder 150 or the output shaft 124.
Claims
R. 415390 IP1 - 22 - Claims 1. Hand-held power tool (100) with a drive unit (111), with an output shaft (124) driven by the drive unit (111), on which a tool holder (150) is formed, which has a polygonal inner receptacle (152) for connection with a first tool (140) and a polygonal outer receptacle (156) for connection with a second tool, and with a locking unit (200) for locking at least the first tool (140), which is associated with the tool holder (150), wherein the locking unit (200) comprises a locking element (210) for locking at least one locking element (220), an actuating sleeve (230) for actuating the locking unit (200), and at least one reset element (250) for resetting the locking unit (200) from a release position to a locking position.at least one support element (260) for supporting the return element (250) and at least one locking element (240) for locking the support element (260), characterized in that the locking element (220) is substantially axially movable about a rotation axis (102) of the tool holder (150).
2. Hand-held power tool (100) according to claim 1, characterized in that the tool holder (150) has at least one locking receptacle (222) formed substantially axially to the axis of rotation (102).
3. Hand-held power tool (100) according to claim 1 or 2, characterized in that the locking unit (200) has at least one locking spring element (224) which is designed to act at least axially on the locking element (220). R. 415390 IP1 - 23 - 4. Hand-held power tool (100) according to one of the preceding claims, characterized by a fixing unit (310) which is designed to fix the locking unit (200) to the tool holder (150).
5. Hand-held power tool (100) according to claim 4, characterized in that the fixing unit (310) has at least one fixing element (312) which is designed to support the return element (250).
6. Hand-held power tool (100) according to claim 5, characterized in that the locking element (210) at least partially rests against the fixing element (312).
7. Hand-held power tool (100) according to one of claims 4 to 6, characterized in that the fixing unit (312) has at least one blocking element (340) which is designed to absorb at least axial forces of the return element (250).
8. Hand-held power tool (100) according to one of the preceding claims, characterized by a centering element (320) which is designed to center at least the return element (250) relative to the tool holder (150).
9. Hand-held power tool (100) according to one of the preceding claims, characterized in that the actuating sleeve (230) has at least one collar (238) which is designed to at least partially support the support element (260).
10. Hand-held power tool (100) according to one of the preceding claims, characterized in that the locking unit (200) has at least one connecting element (330) designed to connect the actuating sleeve (230) to the locking element (210).