CN210678588U - Clamping device for electric tool and electric tool - Google Patents

Abstract

The utility model provides a clamping device and electric tool for electric tool. The clamping device comprises: a core member including a first channel and a second channel; a moving member disposed within the second channel; and a first outer part; the first outer part can rotate to enable different positions of the inner ring of the first outer part to be in contact with the first end of the moving part, the inner ring of the first outer part comprises a first position and a second position, when the first position of the inner ring of the first outer part is in contact with the first end of the moving part, the second end of the moving part is located outside the first channel, and when the second position of the inner ring of the first outer part is in contact with the first end of the moving part, the second end of the moving part extends into the first channel to be matched with the groove in the drill bit side wall.

Description

Clamping device for electric tool and electric tool

Technical Field

The utility model relates to an electric tool field, more specifically, the utility model relates to a multi-functional clamping device for handing electric tool.

Background

Fig. 1 shows an exemplary prior art power tool, comprising: a body 91, a holder 95 and a drill 96. The main body 91 of the electric power tool includes therein a motor unit 92, a transmission 93, and an output unit 94. The transmission unit 93 is used, for example, to convert the rotational torque of the motor unit 92 into rotary, percussive, and rotary plus percussive output, e.g., to cause the bit 96 to output impacts along the axial axis 97 and/or to output rotations about the axial axis 97, in response to a user-set output mode. The holding device 95 is connected to the output unit 94 of the power tool and can hold various kinds of drill bits.

Fig. 2 shows three typical types of drill bits that may be held by a holding device 95, including: an SDS PLUS bit 81, round shank bits 82 and 1/4 "hexagonal shank bit 83, wherein the SDS PLUS bit 81, as used in an electric hammer to output a shock, comprises: a pair of opposing circumferential retention grooves 811 and a pair of opposing axial retention grooves 812.

It is necessary for the holding device 95 to include both a function of being able to hold various kinds of drill bits and to have a compact structure.

SUMMERY OF THE UTILITY MODEL

The utility model aims to solve or at least alleviate the problem that exists among the prior art.

According to an aspect, there is provided a clamping arrangement for a power tool, comprising:

a core member including a first passage along an axial axis for setting a drill bit, and a second passage opening to the first passage in a direction intersecting the axial axis;

a mover disposed within the second channel and having a first end distal from the first channel and a second end proximal to the first channel; and

a first outer part surrounding the core member at an outer side thereof;

wherein the first outer part is rotatable to enable different positions of the inner race of the first outer part to contact the first end of the moving member, the inner race of the first outer part including a first position and a second position, the moving member being in a first state when the first position of the inner race of the first outer part contacts the first end of the moving member, wherein the second end of the moving member is located outside the first passage, and the moving member being in a second state when the second position of the inner race of the first outer part contacts the first end of the moving member, wherein the second end of the moving member extends into the first passage for engagement with the recess on the bit sidewall.

In another aspect, a power tool having a clamping device according to various embodiments is provided.

According to the utility model discloses a device convenient operation.

Drawings

FIG. 1 is a schematic view of a hand tool according to an embodiment;

FIG. 2 shows various drill bits;

FIG. 3 illustrates a perspective view of a vicinity of a clamping device according to an embodiment;

fig. 4 shows a sectional view of the vicinity of the clamping device according to the embodiment of fig. 3 in a state;

fig. 5 shows a sectional view of the clamping device according to the embodiment of fig. 3 in another state;

FIG. 6 shows a perspective view of the vicinity of a clamping device according to another embodiment;

fig. 7 shows a sectional view of the vicinity of the clamping device according to the embodiment of fig. 6 in a state;

fig. 8 shows a sectional view of the clamping device according to the embodiment of fig. 6 in another state;

fig. 9 shows a cross-sectional view of a clamping device according to the embodiment of fig. 6 in a further state;

FIG. 10 shows a cross-sectional view of section D-D of FIG. 9;

FIG. 11 shows a perspective view of an insert according to the embodiment of FIG. 6;

FIG. 12 shows a perspective view of a moving member according to the embodiment of FIG. 6;

fig. 13 shows a perspective view of a second outside part according to the embodiment of fig. 6;

FIG. 14 shows a perspective view of a core member according to the embodiment of FIG. 6; and

fig. 15 shows a perspective view of the intermediate part and the third appearance part according to the embodiment of fig. 6.

Detailed Description

A first embodiment according to the present invention is described with reference to fig. 3 to 5. As shown, the clamping device 95 according to an embodiment is connected on the one hand to the output 14 of the power tool and on the other hand receives various types of drill bits as shown in fig. 2, such as the SDS PLUS drill bit 81. The holding device 95 includes: a core member 10, the core member 10 including a first passage 18 along an axial axis 70 for disposing a drill bit, and a second passage 19 (fig. 5) leading to the first passage 18 in a direction intersecting the axial axis 70; a runner 37, the runner 37 being disposed within the second channel 19 and having a first end 371 distal from the first channel 18 and a second end 372 proximal to the first channel 18; and a first outer part 26, the first outer part 26 surrounding the outside of the core member 10; wherein the first outer part 26 is rotatable to bring different positions of the inner ring of the first outer part 26 into contact with the first end 371 of the moving member 37, the inner ring of the first outer part 26 comprising a first position and a second position, as shown in fig. 5, when the first position 263 of the inner ring of the first outer part 26 is in contact with the first end 371 of the moving member 37, the moving member 37 is in a first state or a released state, wherein the second end 372 of the moving member 37 is located outside the first passage 18, as shown in fig. 4, when the second position 262 of the inner ring of the first outer part 26 is in contact with the first end 371 of the moving member 37, the moving member 37 is in a second state or an engaged state, wherein the second end 372 of the moving member 37 extends into the first passage with a first depth for engagement with the groove 812 on the side wall of the drill bit 81.

With the above structure, the SDS PLUS bit 81 can be easily attached or detached. Taking the example of detaching the drill 81, in the state of fig. 4, it is only necessary to rotate the first outer member 26 in the first direction shown in fig. 3, so that the first position 263 of the inner ring of the first outer member 26 is in contact with the moving member 37, and the second end 372 of the moving member 37 is away from the first passage 18, and thus is no longer blocked in the first passage 18, to allow the installation or removal of the drill 81. It will be appreciated that the second channel 19 may be provided at a bottom position of the core member 10 as shown in the drawings, such that when the first outer member 26 is rotated to its first position 263 to be aligned with the first end 371 of the moveable member when the power tool is held horizontally, the moveable member 37 automatically descends due to gravity, such that its first end 371 is in contact with the first position 263, or, as shown in the drawings, the second end 372 of the moveable member 37 has an arcuate profile, and both ends of the axial direction restraint groove 812 of the drill bit 81 also have arcuate profiles, and the moveable member 37 may be withdrawn from the first channel 18 by interaction of the arcuate profiles of the axial direction restraint groove 812 of the drill bit and the arcuate profile of the second end 372 of the moveable member 37 when the drill bit 81 is withdrawn. The circumferential stop groove 811 of the drill bit 81 cooperates with the other pair of keys 17 of the first channel 18 for circumferential stop. In some embodiments, the first outer part 26 may comprise a shell 260 and an insert 261, the insert 261 may have portions of different thickness distributed along circumferential positions, wherein the thickness corresponding to the first position 263 is less than the thickness of the second position 262, such that the moving member 37 moves outside the first channel 18 when the moving member 37 is aligned with and in contact with the first position 263. In some embodiments, the first outer part 26 or in particular the insert 261 may extend over the entire circumference or only over a certain angle. In some embodiments, the first outer part 26, or specifically the insert 261, may have a plurality of first locations 263 and second locations 262, wherein, for example, the insert is an annular or sector-shaped member having a plurality of slots corresponding to the first locations 263 and other locations corresponding to the second locations 262. In some embodiments, the housing 260 may be integrally formed with an inner structure like the insert 261.

In some embodiments, the second channel 19 extends substantially radially, which helps to shorten the axial length of the entire clamping device. In some embodiments, the second channel 19 forms an angle with the radial direction of less than 15 degrees. In some embodiments, as shown in FIG. 10, the second channel 19 is located between a pair of clamping jaws 41.

In some embodiments, the gripping arrangement further comprises a second outer part 24 located distally of the first outer part 26 (distal from the power tool) and a third outer part 25 located proximally of the first outer part 26 (proximal to the power tool). In some embodiments, a slot is provided in the distal end of the second outer part 24 for mounting a dust cap 51. The dust cap 51 is fitted into a groove of the second outer member 24 by, for example, a snap ring or, in other words, is partially embedded in the second outer member 24, thereby reducing the overall axial length of the clamping device and preventing dust from entering the interior of the clamping device. In some embodiments, a torsion spring 28, for example, provided between the first and third outer parts 26, 25 or between the first outer part 26 and the core member 10, acts on the first outer part 26 such that the first outer part 26 tends to rotate such that the second position 262 of the inner race of the first outer part 26 is in contact with the first end 371 of the moving member 37, in other words, the torsion spring 28 biases the first outer part 26 such that the first outer part 26 rotates to the second state shown in fig. 4. With this arrangement, the clamping device assumes the second state shown in fig. 4 in the normal state of loading or unloading the drill bit, and only rotates the first outer member 26 in the first direction against the force of the torsion spring 28 as shown in fig. 3 to the first state shown in fig. 5 when it is necessary to install or remove the SDS PLUS drill bit 81, thereby allowing the first passage to be fully penetrated to allow installation or removal of the drill bit 81. If the first outer part 26 is released after the drill 81 is inserted into position, the first outer part 26 will automatically return to the second state shown in fig. 4 to lock the drill.

In some embodiments, the core member 10 has a connecting end 11, the connecting end 11 of the core member 10 has a through hole distributed circumferentially and a plurality of slides 61 (e.g. balls) in the through hole, the clamping means comprises a third outer part 25 located outside the connecting end 11 of the core member 10 at a location proximal to the first outer part, the third outer part 25 being movable by rotation from a locking position occupying a radially outer position of the plurality of slides 61 as shown in fig. 4 to a release position shown in fig. 5 leaving a radially outer position of the plurality of slides 61. In particular, as shown in fig. 3, the third outer part 25 is able to rotate in a second direction opposite to the direction of rotation of the first outer part 26, and has an inner ring or insert 251, the insert 251 may for example have a configuration similar to the insert 261 for the first outer part 26, i.e. may be annular and have a plurality of indentations 252 which may correspond circumferentially to the positions of the plurality of sliders 61. In the case shown in fig. 3 and 4, the non-recessed portion of the inner race or insert 251 of the third outer member 25 occupies a position radially outward of the plurality of sliders 61 such that the plurality of sliders 61 cannot move radially outward, and a portion of the plurality of sliders 61 is seated in the recess 141 of the attachment end 14, thereby maintaining the connection between the gripping device 95 and the power tool output end 14. A torsion spring 28 mounted between the first and third outer parts 26, 25 also tends to hold the third outer part 25 in this position. Not shown in the figures, the first outer part 26 and the third outer part 25 may each have a stop which interacts with the core member 10 such that the first outer part 26 is only rotatable in a first direction in the position of fig. 3, while the third outer part 25 is only rotatable in a second direction in the position of fig. 3. As shown in fig. 3 and 5, upon rotating the third outer part 25 in the second direction so that the plurality of notches 252 of its inner race or insert 251 are circumferentially aligned with the plurality of slides 61, the plurality of slides 61 may be moved radially outward to clear the recess 141 of the power tool's outlet 14, thereby allowing the gripping device 95 to be separated from the power tool's outlet 14. By this arrangement, easy mounting and separation between the clamping device 95 and the output end 14 can be achieved in a compact structure.

In addition, the clamping device 95 further comprises a second outer part 24 surrounding the core member 10 distally of the first outer part 26. A plurality of clamping jaws 41, for example three clamping jaws 41, are circumferentially distributed in the core member 10 and are located in the core member 10 and lead obliquely to the first channel, for example at an angle of less than 30 degrees to the axial axis. The inner ring of the second outer part 24 is threaded, such as with an internally threaded ring member 241, to mate with threads on the jaws 41 (the outer part section), so that turning the second outer part 24 drives the jaws 41 along their channels to converge inwardly or diverge outwardly to grip or release a bit in the first channel, such as a round shank bit 82 or 1/4 "hexagonal shank bit 83, which is typically used for rotary output. As shown in fig. 3, the second outer part 24 can be rotated in a first direction to converge the jaws to grip the bit or in a second, opposite direction (not shown) to release the bit.

Next, another embodiment according to the present invention will be described with reference to fig. 6 to 15. In this embodiment, the same reference numerals are used to designate the same or similar components, and the same points as those of the previous embodiment are omitted below and differences from the previous embodiment are mainly described. In this embodiment, the inner ring of the first outer member 26, in particular embodiment, the insert 261, also has a third position 264, and when the third position 264 of the inner ring of the first outer member 26 or the insert 261 contacts the first end 371 of the moveable member 37, as shown in fig. 9 and 10, the moveable member 37 is in a third or blocked state, in which the moveable member 37 extends into the first passageway more than when it contacts the second or second position shown in fig. 7, e.g., extends into the first passageway beyond the axial axis 70, to partially or completely block the first passageway 18, thereby providing a safety protection function for the power tool, as described in detail below. Referring to fig. 10 and 11, a specific structure of the inner race or insert 261 of the first outer member 26 is shown. The outer side of the insert 261, which may be a circular or circular section, comprises a first location 263, a second location 262 and a third location 264, which in turn are distributed over the circumferential location of the inner ring of the first outer part or the insert 261, with a first transition 266 between the first location 263 and the second location 262 and a second transition 265 between the second location 262 and the third location 264. As shown in fig. 11, a channel may be provided throughout the insert at various locations and transitions for sliding first end 371 of moveable member 37 therein. In this embodiment, the torsion spring 28 may be connected, for example, between the core member and the first outside part 26, and is provided to urge the first outside part 26 to rotate to a third state in which the third position 264 of the inner race thereof is in contact with the mover 37. This state may be used for a rotary output mode, for example, in which a round shank bit 82 or 1/4 "hexagonal shank bit 83 may be installed and the jaws 41 held in place by rotating the second outer part 24. The moving member 37, which blocks the first passage, prevents the round shank drill 82 or 1/4' hexagonal shank drill 83 from being installed too deeply into the first passage to approach the striking member 142, preventing the striking member 142 at the output end from outputting a striking force to the drill bit to cause the drill bit to be ejected when the power tool is set in the wrong output mode.

Similarly, as shown in fig. 6, the first outer member 26 is rotated in the first direction from the third state shown in fig. 9 and 10 until the first position 263 of the inner ring of the first outer housing 26 is aligned with the first end of the moving member 37 and comes into contact with the first position 263 as the moving member falls along the second path, at which time the gripping device is in the first state or released state shown in fig. 8. As with the previous embodiment, the ram 37 is clear of the first passage 18 to allow for installation and removal of the drill bit, as the SDS PLUS drill bit 81 for receiving the percussive output may be installed to a deeper location of the first passage for receiving the percussive impact from the impact member 142 of the power tool output 14. When the SDS PLUS drill bit 81 is installed into the first channel, its circumferential retaining groove 811 engages the key 17 in the first channel (fig. 9 and 10), at which point the first outer part 26 is released and will rotate to a second or locked state as shown in fig. 7 due to the force of the torsion spring 28, wherein the second position 262 of the inner ring of the first outer part 26 will contact the first end 371 of the moving member 37, and the second end 372 of the moving member 37 enters the first channel 18 and engages one of a pair of opposing axial retaining grooves 812 of the SDS PLUS drill bit 81, at which point the first outer part 26 will not rotate further due to the force of the torsion spring, although still being received by the moving member against the drill bit. The axial restraint slot 812 has a length in the axial direction to limit the maximum axial displacement of the SDS PLUS bit 81 when impacted by the impactor 142, as shown in fig. 7, when the second end 372 of the moveable member 37 contacts the proximal most side of the axial restraint slot 812, the SDS PLUS bit 81 is at its outwardly projecting maximum displacement position. In the illustrated embodiment, the inner race or insert 261 of the first outer side member 26 is provided as a segment or sector of a circumference, and in an alternative embodiment, the inner race or insert 261 of the first outer side member 26 may be provided as a full circle and may have a plurality of first, second and/or third positions.

Referring to fig. 12, a perspective view of the moving member 37 is shown. Moveable member 37 may have a first end 371 and a second end 372. In some embodiments, both the first end and the second end of the moving member 37 may be configured as a hemisphere. In some embodiments, a protrusion 374 extends from the sidewall near first end 371 of moveable member 37. In some embodiments, for example, moveable member 37 may have a raised portion 373 opposite protrusion 374 or other suitable location. The moving member 37 in the figure also has a slightly larger diameter cylindrical portion 375 at the first end 371.

Referring to fig. 9 and 14, the core member 10 includes a distal end 12 and a connecting end 11. A first channel 18, a second channel 19 and two sections 162, 161 of an oblique channel for the clamping jaw 41 are formed in the core member 10. The core member 10 has a disc 17 adjacent the second channel 19 and the runner 37 therein, with radial slots 171 in the disc 17 corresponding to the location of the second channel. The protrusion 374 of the displacement member 37 fits into the groove 171 of the core member 10, the groove 171 being arranged to limit the circumferential position of the displacement member and/or the range of displacement of the displacement member 37 along the second channel or in other words the depth to which the displacement member 37 can extend into the first channel. That is, as shown in fig. 9, the protrusion 374 of the moving member is in contact with the deepest position of the groove 171 when the moving member is at this position and cannot move further upward.

As shown in fig. 7 and 13, the second outer member 24 has an end face 247 close to the first outer member 26. The end face 247 is also proximate to the moving member 37. The end face 247 of the second outer member 24 includes retaining members 249 with a space or gap 248 between the retaining members 249. When the moving member 37 is in the second state shown in fig. 7, the stoppers 249 on the end surface 247 of the second outer member 24 interact with the raised portion 373 of the moving member to restrict the rotation of the second outer member 24. In the illustrated embodiment, the limiting member is a plurality of divergent ribs spaced along the circumference of the end surface 247 at radial positions corresponding to the raised portions 373 of the moving member 37 in the second state, and the raised portions 373 of the moving member 37 are in the spacing portions 248 between two adjacent ribs in the second state. At this time, since the moving member 37 is not rotatable with respect to the core member 10, the second outside member 24 is also hardly rotatable or rotatable only in a small range due to the engagement of the stopper at the end surface of the second outside member with the protrusion 373 of the first moving member 37. The purpose of this design is: when the power tool is using the SDS PLUS bit 81 and is in the second state shown in fig. 7, the second outer member 24 is prevented from being erroneously operated to tighten the holding claw 41. If the gripping claws 41 are tightened to grip the drill bit 81 in this state, the gripping claws 41 may be damaged when the drill bit 81 receives the impact of the impact piece 142, which is avoided by the design according to the present invention. In some embodiments, the ribs of the end face 247 of the second outer part 24 are angularly spaced apart by less than 10 degrees. It should be noted that when the moving member 37 is in the third state shown in fig. 9 and 10, since the convex portion 373 of the moving member 37 is located radially inside the stopper 249 of the second outer member 24, the two will not interfere with each other and the second outer member 24 can be rotated as required to clamp or release the drill.

With continued reference to fig. 6, 7 and 15, in the present arrangement, an intermediate member 27 is provided between the first and third outer members 26, 25. A torsion spring 28 is provided between the first outer member 26 and the outside of the intermediate member 27, and a compression spring 29 is provided between the inside of the intermediate member 27 and the third outer member 25. The third outer member 25 is urged toward the first outer member 26 (to the left in fig. 7) against the urging force of the compression spring 29, whereby the inner ring of the third outer member (e.g., the washer 255 of the inner ring of the third outer member 25) occupying a position radially outside the plurality of sliders 61 is displaced axially, leaving a position radially outside the plurality of sliders 61 to allow the plurality of sliders 61 to move radially outwardly, thereby removing the clamping device from the connecting end 14 of the electric power tool. The torsion spring 28, the compression spring 29 and the clamping claws 41 at least partially overlap in the axial direction, for example with an overlap region of at least 3mm in the axial direction, so that the entire clamping device has a compact structure and a smaller length in the axial direction. In some embodiments, the inner ring threaded portion or threaded annular member 241 of the second outer part 24 partially overlaps the key 17 in the first passage in the axial direction, thereby resulting in a compact construction and a smaller length of the entire clamping device in the axial direction.

Fig. 15 shows a perspective view of the intermediate part 27 and the third outer part 25, the distal side of the intermediate part 27 comprising a plurality of protrusions 271 to engage with indentations 172 on the outside of the disc 17 of the core member 10 to fix the intermediate part 27 in the circumferential direction relative to the core member 10, and the proximal side of the intermediate part 27 having a plurality of protrusions 273 to engage with the grooves 254 of the third outer part 25 to fix the intermediate part 27 in the circumferential direction relative to the third outer part 25. The outer race of the intermediate member 27 has a stopper 275 and a mounting hole 274 for supporting the torsion spring 28, and the inner race thereof has a stopper 272 for supporting the compression spring 29. The third outer part 25 also has an inner ring 255 for mounting a compression spring. As can be seen in fig. 8, compression spring 29 has a diameter that tapers from the distal side to the proximal side.

Additionally, the utility model discloses still provide the electric tool who has the clamping device according to the utility model discloses an embodiment.

All of the above embodiments provide details that are exemplary and not limiting.

Claims (17)

1. A clamping device for a power tool, comprising:

a core member (10), the core member (10) comprising a first passage (18) along an axial axis (70) for providing a drill bit (81,82,83), and a second passage (19) leading to the first passage (18) in a direction intersecting the axial axis (70);

a moving member (37), said moving member (37) being arranged within said second channel (19) and having a first end (371) distal from said first channel (18) and a second end (372) proximal to said first channel (18); and

a first outer part (26), the first outer part (26) surrounding the outside of the core member (10);

a second outer part (24), said second outer part (24) surrounding said core member distally of said first outer part (26), said core member (10) having a plurality of gripping fingers (41) circumferentially distributed therein, an inner ring of said second outer part (24) having threads for mating with the threads on said gripping fingers (41) such that turning said second outer part (24) drives said gripping fingers (41) to converge or diverge;

wherein the first outer part (26) is rotatable so that different positions of an inner ring of the first outer part (26) can be brought into contact with a first end (371) of the moving member, the inner race of the first outer part including a first position (263) and a second position (262), when a first position (263) of the inner ring of the first outer part is in contact with a first end (371) of the moving member, the moving member (37) is in a first state, wherein a second end (372) of the displacement member is located outside the first channel (18), when a second position (262) of the inner ring of the first outer member is in contact with a first end (371) of the moving member, the moving member is in a second state, wherein a second end (372) of the displacement member extends into the first passage (18) for mating with a recess (812) in the bit sidewall.

2. A holding device according to claim 1, wherein the inner ring of the first outer part (26) further has a third position (264), the moving member being in a third state when the third position (264) of the inner ring of the first outer part is in contact with the first end (371) of the moving member, the moving member extending into the first passage (18) more than in the second state to at least partially close off the first passage (18).

3. Gripping apparatus according to claim 2, characterized in that the displacement member projects into the first channel (18) beyond the axial axis (70).

4. Clamping device according to claim 3, characterized in that the first (263), second (262) and third (264) positions are distributed in succession over different circumferential positions of the inner ring of the first outer part or of the insert mounted to the inner side of the first part, and that there is a gradual transition (266,265) between the first (263) and second (262) and second (264) and third (264) positions.

5. Clamping device according to claim 1, characterized in that the second channel (19) is at an angle of less than 15 degrees to the radial direction.

6. A clamping arrangement according to claim 5, characterised in that the second channel is located between a pair of clamping jaws (41).

7. Clamping device according to claim 6, characterized in that the second channel (19) extends in a radial direction.

8. Gripping device according to claim 1 or 2, further comprising a torsion spring (28), the torsion spring (28) acting on the first outer part (26) such that the first outer part (26) tends to rotate to bring the second position (262) or the third position (264) of the inner ring of the first outer part into contact with the first end (371) of the moving part, wherein the first outer part (26) is rotatable in a first direction against the force of the torsion spring (28) such that the first position (263) of the inner ring of the first outer part (26) is in contact with the first end of the moving part.

9. Clamping device according to claim 1, characterized in that the core member has a radial groove (171), the displacement member has a projection (374) to fit into the radial groove (171) of the core member, the radial groove (171) being arranged to limit the circumferential position of the displacement member (37) and/or the depth of the displacement member into the first channel (18).

10. The clamping arrangement as recited in claim 9, characterised in that the second outer part (24) has an end face (247) in proximity to the moving member, the moving member (37) has a raised portion (373) facing the end face (247) of the second outer part, the end face (247) of the second outer part including a retaining member (249), the retaining member (249) of the end face (247) of the second outer part interacting with the raised portion (373) of the moving member when the moving member (37) is in the second state to limit rotation of the second outer part (24).

11. The clamping device as claimed in claim 10, characterized in that said retaining member (249) is a plurality of ribs circumferentially spaced along said end surface corresponding in the second state to radial positions of a raised portion (373) of said moving member.

12. A holding arrangement as claimed in claim 11, wherein the ribs are spaced less than 10 degrees apart.

13. Clamping device according to claim 1 or 2, characterized in that the core member (10) has a connecting end (11), the connecting end (11) of the core member having through holes distributed along the circumference, in which through holes a plurality of slides (61) are located, the clamping device comprising a third outer part (25) located near the first outer part (26) around the outside of the connecting end (11) of the core member, the third outer part (25) being movable by turning or moving towards the first outer part (26) from a locking position occupying a radially outer position of the plurality of slides (61) to a release position freeing the radially outer position of the plurality of slides (61).

14. Clamping device according to claim 13, wherein a torsion spring (28) is provided between the first outer part (26) and the third outer part (25), the third outer part (25) being able to align the indentations (252) of the inner ring of the third outer part (25) with the plurality of slides (61) by rotating in a second direction opposite to the first direction against the force of the torsion spring (28), thereby allowing the plurality of slides (61) to move radially outwards.

15. A clamping arrangement according to claim 13, characterised in that an intermediate part (27) is provided between the first outer part (26) and the third outer part (25) which is fixed relative to the core member (10), a torsion spring (28) is provided between the first outer part (26) and the outer ring of the intermediate part (27), a compression spring (29) is provided between the inner ring of the intermediate part (27) and the third outer part (25), and the third outer part (25) is movable towards the first outer part (26) against the force of the compression spring (29), whereby the inner ring of the third outer part (25) which occupies the radially outer side of the plurality of slides (61) is moved axially apart, allowing the plurality of slides (61) to move radially outwards.

16. A clamping arrangement as claimed in claim 15, characterised in that the clamping jaws (41) in the core member, the compression spring (29) and the torsion spring (28) have an overlap area of at least 3mm in the axial direction.

17. A power tool, characterized in that it comprises a holding device according to any one of claims 1-16.

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