Clamping mechanism and power tool

Abstract

The present disclosure relates to a clamping mechanism and a power tool, the clamping mechanism comprising a main body, a locking cap, a spring chuck, a sleeve and an elastic member; the spring chuck comprises spring claws, the spring claws are located in the locking cap and are arranged along the circumference of the chuck rod to form a clamping jaw hole. The locking cap is connected with the main body, and the locking cap can move in the direction close to the main body to make the spring claws close to each other under the extrusion of the inner wall of the locking cap, so that the aperture of the clamping jaw hole is reduced to realize clamping, or move in the direction away from the main body to make the locking cap release the extrusion on the spring claws, so that the aperture of the clamping jaw hole is enlarged to release or loosen the spring claws. In order to further guarantee the locking connection between the spring claws and the grinding head of the electric grinder, make the connection reliable, and prevent the two from separating and causing danger, the annular member arranged between the locking cap and the main body can be used to limit the rotation of the locking cap relative to the main body to realize locking.

Description

Technical Field

[0001] This disclosure relates to the field of clamping mechanism technology, and more particularly to a reliable locking clamping mechanism and power tool. Background Technology

[0002] Power tools, such as electric grinders, are widely used in people's lives to perform tasks such as grinding, polishing, and carving.

[0003] Power tools typically consist of a main unit, a grinding head, and a clamping mechanism. The clamping mechanism connects the grinding head to the main unit, enabling the main unit to perform tasks such as grinding and polishing. However, because the grinding head rotates at a very high speed during operation, if the clamp between the grinding head and the main unit becomes loose, it can easily lead to danger and safety hazards. Summary of the Invention

[0004] In order to solve the above-mentioned technical problems, or at least partially solve the above-mentioned technical problems, this disclosure provides a clamping mechanism and a power tool.

[0005] On the one hand, this disclosure provides a clamping mechanism, including a main body, a locking cap, a spring clamp, and an outer sleeve sleeved on the outer periphery of the locking cap and capable of driving the locking cap to rotate;

[0006] The spring collet includes at least two spring claws, which together form a claw hole; the locking cap is connected to the main body, and the locking cap can move in a direction close to the main body so that the at least two spring claws move closer to each other under the squeezing action of the inner wall of the locking cap to achieve clamping, or move in a direction away from the main body so that the spring claws are released.

[0007] An annular member is provided at one end of the locking cap near the main body, and an elastic member is provided between the annular member and the locking cap. A first groove is provided on the inner wall of the outer sleeve, and a cam block is provided on the annular member to cooperate with the first groove. When the cam block rotates into the first groove, the annular member cooperates with the main body under the action of the elastic member, so as to restrict the locking cap from rotating relative to the main body in the direction of the spring claw's release when the spring claw clamps. When the cam block moves out of the first groove, the annular member disengages from the main body.

[0008] According to one embodiment of the present disclosure, a first locking portion is formed on the annular member, and a second locking portion is formed on the main body. The second locking portion is used to cooperate with the first locking portion to restrict the locking cap from rotating relative to the main body in the direction of the spring claw's release when the spring claw clamps.

[0009] According to one embodiment of this disclosure, the annular member is provided with ratchet teeth, the ratchet teeth are formed as the first locking part, and the second locking part is a meshing tooth provided on the main body for engaging with the ratchet teeth.

[0010] According to one embodiment of this disclosure, a second groove is further provided on the inner wall of the outer casing. The second groove is adjacent to the first groove, and the groove depth of the second groove is less than the groove depth of the first groove, so that when the cam block rotates from the second groove to the first groove, the ratchet engages with the meshing tooth, and when the cam block rotates from the first groove to the second groove, the ratchet disengages from the meshing tooth.

[0011] According to one embodiment of this disclosure, the outer jacket is provided with a first driving part, and the locking cap is provided with a second driving part. The first driving part and the second driving part are drivenly connected so that when the outer jacket is rotated, the locking cap can be rotated.

[0012] According to one embodiment of this disclosure, the first driving part is a driving bar, and the second driving part is a driving groove. The driving bar can extend into the driving groove and is in clearance fit with the driving groove. The clearance corresponds to the angle of rotation of the annular member when it is engaged with or disengaged from the main body.

[0013] According to one embodiment of this disclosure, there are at least two first driving portions, and the at least two first driving portions are arranged circumferentially at intervals along the inner wall of the outer sleeve, and the first groove and the second groove are located between two adjacent first driving portions.

[0014] According to one embodiment of this disclosure, a first snap-fit ​​portion is provided on the inner wall of the annular member, and a second snap-fit ​​portion is provided on the locking cap for engaging with the first snap-fit ​​portion, so that the annular member and the locking cap are relatively fixed in the circumferential direction and can move relative to each other in the axial direction.

[0015] According to one embodiment of this disclosure, a first conical surface is formed on the outer wall surface of the spring claw near the locking cap, and a second conical surface that mates with the first conical surface is formed on the inner wall of the locking cap.

[0016] According to one embodiment of this disclosure, the outer wall surface of the spring claw near one end of the body has a first positioning surface, and a second positioning surface that mates with the first positioning surface is formed on the inner wall of the body.

[0017] According to one embodiment of this disclosure, a first thread is provided on the outer wall of the main body, and a second thread is provided on the inner wall of the locking cap that engages with the first thread. The main body and the locking cap are connected through the engagement of the first thread and the second thread.

[0018] On the other hand, this disclosure provides a power tool including a main unit, a clamping member, and the aforementioned clamping mechanism, wherein the main unit and the clamping member are connected through the clamping mechanism.

[0019] The technical solution provided in this disclosure has the following advantages compared with the prior art:

[0020] This disclosure provides a clamping mechanism and a power tool. The clamping mechanism includes a main body, a locking cap, a spring collet, and an outer sleeve fitted around the locking cap and capable of rotating the locking cap. The spring claws of the spring collet form a claw hole, which can be used to clamp and connect to the clamping components of the power tool. The locking cap is connected to the main body and can move towards the main body so that at least two spring claws are brought closer together under the squeezing action of the inner wall of the locking cap, thereby reducing the diameter of the claw hole to achieve clamping, or it can move away from the main body so that the locking cap releases the squeezing action on the spring claws, thereby expanding the diameter of the claw hole to release or loosen the spring claws. A ring-shaped component is provided at one end of the locking cap near the main body. An elastic component is provided between the ring-shaped component and the locking cap. A first groove is provided on the inner wall of the outer sleeve. A cam block is provided on the ring-shaped component that cooperates with the first groove. When the cam block rotates into the first groove, the ring-shaped component cooperates with the main body under the action of the elastic component. This restricts the locking cap from rotating relative to the main body in the direction of the spring claw's release when the spring claw clamps, thereby achieving locking. This prevents the clamping mechanism from loosening during operation, thus avoiding safety hazards. Attached Figure Description

[0021] The accompanying drawings, which are incorporated in and form a part of this specification, illustrate embodiments consistent with this disclosure and, together with the description, serve to explain the principles of this disclosure.

[0022] To more clearly illustrate the technical solutions in the embodiments of this disclosure or the prior art, the accompanying drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 This is a perspective view of the clamping mechanism described in the embodiments of this disclosure;

[0024] Figure 2 This is a schematic diagram of the internal structure of the clamping mechanism described in the embodiments of this disclosure;

[0025] Figure 3 This is an exploded structural diagram of the clamping mechanism described in the embodiments of this disclosure;

[0026] Figure 4This is a schematic diagram of the main body of the clamping mechanism described in the embodiments of this disclosure;

[0027] Figure 5 This is a schematic diagram of the spring collet of the clamping mechanism described in the embodiments of this disclosure;

[0028] Figure 6 This is a schematic diagram of the outer casing of the clamping mechanism described in the embodiments of this disclosure;

[0029] Figure 7 This is a schematic diagram of the structure of the annular component of the clamping mechanism described in the embodiments of this disclosure;

[0030] Figure 8 This is a schematic diagram of the locking cap of the clamping mechanism described in the embodiments of this disclosure.

[0031] The components are as follows: 1. Main body; 11. First thread; 12. Engaging tooth; 13. Second positioning surface; 2. Locking cap; 21. Second thread; 22. Second keyway; 23. Second boss; 24. Drive platform; 25. Drive groove; 26. Second conical surface; 3. Spring collet; 31. Collet rod; 32. Spring claw; 321. First conical surface; 322. First positioning surface; 33. Claw hole; 4. Ring-shaped component; 41. Racket; 42. First keyway; 43. First boss; 44. Cam block; 5. Outer sleeve; 51. Drive bar; 52. First groove; 53. Second groove; 6. Elastic component; 7. Snap ring; 8. Steel wire spring. Detailed Implementation

[0032] To better understand the above-mentioned objectives, features, and advantages of this disclosure, the solutions disclosed herein will be further described below. It should be noted that, unless otherwise specified, the embodiments and features described herein can be combined with each other.

[0033] Numerous specific details are set forth in the following description in order to provide a full understanding of this disclosure, but this disclosure may also be implemented in other ways different from those described herein; obviously, the embodiments in the specification are only some, and not all, of the embodiments of this disclosure.

[0034] Example 1

[0035] like Figures 1 to 8 As shown, this disclosure provides a clamping mechanism, which includes a main body 1, a locking cap 2, a spring clamp 3, and an outer sleeve 5 that is sleeved on the outer periphery of the locking cap 2 and can drive the locking cap 2 to move.

[0036] The spring collet 3 includes a collet rod 31 located within the main body 1 and at least two spring claws 32 connected to the collet rod 31. Each spring claw 32 is located within the locking cap 2 and is spaced apart circumferentially along the collet rod 31 to form a claw hole 33, which can be used to clamp the clamping parts of a power tool. Specifically, both the main body 1 and the locking cap 2 are hollow structures with openings at both ends. The collet rod 31 is located in the cavity of the main body 1, and the spring claws 32 are located in the cavity of the locking cap 2.

[0037] It is understood that there are gaps or openings between adjacent spring claws 32, so that multiple spring claws 32 can move toward each other under the action of external compressive force to clamp the clamping member, or multiple spring claws 32 can move toward each other to open the spring claws 32 to release or loosen the clamping member.

[0038] The clamping component can be, for example, an electric grinder head, or other components that need to be clamped.

[0039] The locking cap 2 is connected to the main body 1, and the locking cap 2 can move in a direction close to the main body 1, so that at least two spring claws 32 are brought closer together under the squeezing action of the inner wall of the locking cap 2, thereby reducing the diameter of the claw hole 33 to achieve clamping of the clamping member. The locking cap 2 can also move in a direction away from the main body 1, so that the locking cap 2 releases the squeezing action on the spring claws 32, thereby increasing the diameter of the claw hole 33 to release or loosen the clamping member.

[0040] In practice, the outer wall of the main body 1 is provided with a first thread 11, and the inner wall of the locking cap 2 is provided with a second thread 21. The main body 1 and the locking cap 2 are connected by thread through the engagement of the first thread 11 and the second thread 21.

[0041] A ring-shaped member 4 is provided at one end of the locking cap 2 near the main body 1, and an elastic member 6 is provided between the ring-shaped member 4 and the locking cap 2. The elastic member 6 can be an elastic pad or an elastic ring, etc. A first groove 52 is provided on the inner wall of the outer sleeve 5, and a cam block 44 that cooperates with the first groove 52 is provided on the ring-shaped member 4. When the cam block 44 rotates into the first groove 52, the ring-shaped member 4 cooperates with the main body 1 under the action of the elastic member 6, so as to restrict the rotation of the locking cap 2 relative to the main body 1 in the direction of the release of the spring claw 32 when the spring claw 32 clamps, so as to achieve reliable locking. When the cam block 44 moves out of the first groove 52, the ring-shaped member 4 disengages from the main body 1 and the locking is released.

[0042] like Figures 1 to 3 , Figure 6As shown, the outer sleeve 5 and the locking cap 2 are driven together, so that rotating the outer sleeve 5 by a certain angle will cause the locking cap 2 to rotate. For example, in practical use, when the outer sleeve 5 is rotated forward to a certain angle, the locking cap 2 can move towards the main body 1 under the drive of the outer sleeve 5, so that the spring claw 32 is in a clamping state. At this time, the cam block 44 rotates into the first groove 51, so that the annular member 4 engages with the main body 1. The elastic member 6, located between the annular member 4 and the locking cap 2 and compressed, can provide elastic restoring force to the annular member 4 to push it towards the main body 1, ensuring that the annular member 4 engages with the main body 1 to achieve locking, and the spring claw 32 will not loosen. When the outer sleeve 5 is rotated in the opposite direction to a certain angle, the cam block 44 rotates out of the first groove 51, so that the annular member 4 disengages from the main body 1. The locking cap 2 can then move away from the main body 1 under the drive of the outer sleeve 5, so that the spring claw 32 is in a relaxed state.

[0043] In specific implementation, the annular member 4 is provided with a first locking part, and the main body 1 is provided with a second locking part. The second locking part is used to cooperate with the first locking part to restrict the locking cap 2 from rotating relative to the main body 1 in the direction that causes the spring claw 32 to release when the spring claw 32 is clamped. (Refer to...) Figure 7 As shown, the annular member 4 is provided with a ratchet 41, which forms the first locking part mentioned above, and the second locking part is the meshing tooth 12 provided on the main body 1.

[0044] When the locking cap 2 moves towards the main body 1 to clamp the jaws 33, the ratchet 41 on the annular member 4 engages with the meshing teeth 12 on the main body 1. Due to the one-way anti-reverse action of the ratchet 41, it can only rotate relative to the main body 1 in the direction of clamping the spring jaw 32, and cannot rotate in the opposite direction, thus achieving reliable locking and ensuring that the spring jaw 32 will not loosen when clamping the grinding head, avoiding safety hazards caused by the two separating or becoming loose. When the locking cap 2 moves away from the main body 1, the ratchet 41 disengages from the meshing teeth 12, allowing the locking cap 2 to rotate in the direction of releasing the spring jaw 32, so that the spring jaw 32 can release or release the grinding head.

[0045] like Figure 6 , Figure 8 As shown, a second groove 53 is also provided on the inner wall of the outer jacket 5. The second groove 53 is adjacent to the first groove 52, and the groove depth of the second groove 53 (i.e., Figure 6 The dimension of the second groove 53 in the x-direction is smaller than the groove depth of the first groove 52 (i.e., Figure 6The first groove 52 is sized in the x-direction so that when the cam block 44 rotates from the second groove 53 into the first groove 52, the ratchet 41 engages with the meshing tooth 12, and when the cam block 44 rotates from the first groove 52 into the second groove 53, the ratchet 41 disengages from the meshing tooth 12. By setting the second groove 53, the positioning of the annular member 4 is more reliable when it disengages from the mating body 1. It should be noted that the second groove 53 may not be set, and the outer sleeve 5 only needs to have a structural height difference that allows the annular member 4 to disengage from the mating body 1 when the cam block 44 rotates out of the first groove 51.

[0046] like Figure 6 , Figure 8 As shown, the outer sleeve 5 is provided with a first driving part, and the locking cap 2 is provided with a second driving part. The first driving part and the second driving part are drivenly connected so that rotating the outer sleeve 5 can drive the locking cap 2 to rotate. Specifically, the first driving part is a driving bar 51, and the second driving part is a driving groove 25. The driving bar 51 can extend into the driving groove 25 and is in clearance fit with the driving groove 25. That is, the arc length S1 of the driving groove 25 along the circumference of the locking cap 2 is greater than the arc length S2 of the driving bar 51 along the circumference of the outer sleeve 5, and the gap between the two arc lengths corresponds to the angle of rotation of the annular member 4 when it is engaged with and disengaged from the mating body 1. Specifically, a driving platform 24 is formed on the outer periphery of the locking cap 2, and a driving groove 25 is formed between two adjacent driving platforms 24.

[0047] In a specific implementation, at least two drive bars 51 can be set, and the at least two drive bars 51 are distributed at intervals along the circumference of the outer sleeve 5. Correspondingly, there are at least two drive grooves 25, with one drive groove 25 corresponding to one drive bar 51. The first groove 52 and the second groove 53 are located between two adjacent drive bars 51.

[0048] like Figure 7 , Figure 8 As shown, a first snap-fit ​​portion is formed on the inner wall of the annular member 4, and a second snap-fit ​​portion is formed on the locking cap 2 to cooperate with the first snap-fit ​​portion, so that when the first snap-fit ​​portion is snapped into the second snap-fit ​​portion, the annular member 4 and the locking cap 2 are relatively fixed in the circumferential direction and can move relatively in the axial direction.

[0049] In specific implementation, the first locking part is a first keyway 42, and a first boss 43 is formed between adjacent first keyways 42. The second locking part is a second boss 23, and a second keyway 22 is formed between adjacent second bosses 23, so that the second boss 23 can be locked in the first keyway 42 to achieve relative fixation between the annular member 4 and the locking cap 2 in the circumferential direction, and can move in the axial direction.

[0050] like Figure 2 , Figure 5As shown, a first conical surface 321 is formed on the outer wall surface of the spring claw 32 near the locking cap 2; a second conical surface 26 that mates with the first conical surface 321 is formed on the inner wall of the locking cap 2. Specifically, in the direction from the chuck bar 31 to the spring claw 32, the first conical surface 321 is inclined toward the direction close to the central axis of the chuck bar 31. When the locking cap 2 moves along the direction close to the main body 1, the second conical surface 26 of the locking cap 2 presses against the first conical surface 321 of the spring claw 32, thereby causing the spring claw 32 to clamp the grinding head. Conversely, when the locking cap 2 moves away from the main body 1, the spring claw 32 releases the grinding head.

[0051] like Figure 2 , Figure 4 As shown, the outer wall surface of the spring claw 32 near the end of the main body 1 has a first positioning surface 322, and a second positioning surface 13 that cooperates with the first positioning surface 322 is formed on the inner wall of the main body 1.

[0052] Specifically, along the direction from the chuck bar 31 to the spring claw 32, the first positioning surface 322 is inclined away from the central axis of the chuck bar 31. The first positioning surface 322 is inclined away from the central axis of the chuck bar 31, so that when the spring claw 32 clamps, the contact surface between the main body 1 and the spring claw 32 is subjected to uniform force, thereby ensuring the clamping accuracy of the main body 1 for the spring chuck 2.

[0053] In practice, a retaining spring 7 is fitted at the end of the locking cap 2 furthest from the main body 1. A wire spring 8 is also fitted between the main body 1 and the outer sleeve 5. By setting the retaining spring 7 and the wire spring 8, the main body 1, locking cap 2 and other components are axially limited within the outer sleeve 5, forming a complete clamping mechanism.

[0054] Example 2

[0055] Reference Figures 1 to 8 As shown, this embodiment provides a power tool, including a main unit, a clamping member, and a clamping mechanism.

[0056] The main unit and the clamping component are connected by a clamping mechanism. This clamping component can be, for example, an electric grinder head.

[0057] The clamping mechanism provided in this embodiment has the same specific structure and implementation principle as the clamping mechanism provided in Embodiment 1, and can bring the same or similar technical effects. It will not be described in detail here. For details, please refer to the description of Embodiment 1.

[0058] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0059] The above description is merely a specific embodiment of this disclosure, enabling those skilled in the art to understand or implement it. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this disclosure. Therefore, this disclosure is not to be limited to the embodiments described herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A clamping mechanism, characterized in that, It includes a main body, a locking cap, a spring clip, and an outer sleeve fitted around the locking cap and capable of rotating the locking cap; The spring collet includes at least two spring claws, which together form a claw hole; the locking cap is connected to the main body, and the locking cap can move in a direction close to the main body so that the at least two spring claws move closer to each other under the squeezing action of the inner wall of the locking cap to achieve clamping, or move in a direction away from the main body so that the spring claws are released. An annular member is provided at one end of the locking cap near the main body, and an elastic member is provided between the annular member and the locking cap. A first groove is provided on the inner wall of the outer sleeve, and a cam block is provided on the annular member to cooperate with the first groove. When the cam block rotates into the first groove, the annular member cooperates with the main body under the action of the elastic member, so as to restrict the locking cap from rotating relative to the main body in the direction of the spring claw's release when the spring claw clamps. When the cam block moves out of the first groove, the annular member disengages from the main body.

2. The clamping mechanism according to claim 1, characterized in that, A first locking portion is formed on the annular member, and a second locking portion is formed on the main body. The second locking portion is used to cooperate with the first locking portion to restrict the locking cap from rotating relative to the main body in the direction in which the spring claw is released when the spring claw is clamped.

3. The clamping mechanism according to claim 2, characterized in that, The annular member is provided with ratchet teeth, which form the first locking part, and the second locking part is a meshing tooth provided on the main body for engaging with the ratchet teeth.

4. The clamping mechanism according to claim 3, characterized in that, The inner wall of the outer casing is also provided with a second groove, which is adjacent to the first groove. The groove depth of the second groove is less than that of the first groove, so that when the cam block rotates from the second groove to the first groove, the ratchet engages with the meshing tooth, and when the cam block rotates from the first groove to the second groove, the ratchet disengages from the meshing tooth.

5. The clamping mechanism according to claim 1, characterized in that, The outer cover is provided with a first driving part, and the locking cap is provided with a second driving part. The first driving part and the second driving part are drivenly connected so that when the outer cover is rotated, the locking cap can be rotated.

6. The clamping mechanism according to claim 5, characterized in that, The first driving part is a driving bar, and the second driving part is a driving groove. The driving bar can extend into the driving groove and is in clearance fit with the driving groove. The clearance corresponds to the angle of rotation of the annular member when it is engaged with or disengaged from the main body.

7. The clamping mechanism according to claim 6, characterized in that, The inner wall of the outer jacket is also provided with a second groove, and there are at least two first driving parts. The at least two first driving parts are arranged circumferentially along the inner wall of the outer jacket, and the first groove and the second groove are located between two adjacent first driving parts.

8. The clamping mechanism according to claim 1, characterized in that, The inner wall of the annular member is provided with a first snap-fit ​​portion, and the locking cap is provided with a second snap-fit ​​portion for engaging with the first snap-fit ​​portion, so that the annular member and the locking cap are relatively fixed in the circumferential direction and can move relative to each other in the axial direction.

9. The clamping mechanism according to any one of claims 1 to 8, characterized in that, The outer wall surface of the spring claw near the locking cap has a first conical surface, and the inner wall of the locking cap has a second conical surface that mates with the first conical surface.

10. The clamping mechanism according to any one of claims 1 to 8, characterized in that, The outer wall surface of the spring claw near the end of the main body has a first positioning surface, and a second positioning surface that mates with the first positioning surface is formed on the inner wall of the main body.

11. The clamping mechanism according to any one of claims 1 to 8, characterized in that, The outer wall of the main body is provided with a first thread, and the inner wall of the locking cap is provided with a second thread that meshes with the first thread. The main body and the locking cap are connected through the meshing of the first thread and the second thread.

12. A power tool, characterized in that, It includes a host, a clamping member, and a clamping mechanism as described in any one of claims 1 to 11, wherein the host and the clamping member are connected via the clamping mechanism.

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