Self-locking drill chuck

Abstract

According to the self-locking drill chuck, the self-locking structure comprises the elastic piece, the front end of the nut sleeve protrudes out of the nut, the installation portion of the elastic piece is arranged on the protruding portion, the elastic piece is installed, and the installation portion comprises the supporting portion. The elastic piece is arranged to be a cantilever supported by the supporting part from the part, supported by the supporting part, in front of the control protrusion to the lock end. A hole corresponding to the positioning protrusion is formed in the portion, protruding out of the nut, of the front end of the nut sleeve, and when the elastic piece section and the nut rotate together, and the positioning protrusion slides between the first groove and the second groove and is pressed and deformed, the roots of the two ends of the positioning protrusion can elastically deform into the hole. Under the condition that the elastic pieces are externally wrapped and installed, not only can the positioning function be normally provided and the self-locking state be effectively kept in the working process of the drill chuck be achieved, but also when the elastic pieces slide between the two positioning grooves, the elastic pieces playing a positioning role can be fully deformed, normal rotating operation is fully guaranteed, and the working efficiency is improved. And the self-locking structure has the function of preventing the lock end from drooping.

Description

Technical Field

[0001] The utility model relates to a drill chuck, in particular to a hand-tight drill chuck. Background Art

[0002] In the prior art, a drill body, clamping jaws, a nut, bearings, gaskets, a rotating sleeve and a rear sleeve are provided in a drill chuck. By rotating the nut, the clamping jaws are driven to move forward or backward, so that the drill chuck clamps or releases a drill tool. The self-locking structure in the drill chuck is a structure for preventing the drill tool from being released due to the reaction force received during operation. It includes a spring piece synchronized with the nut in the circumferential direction and teeth located on the drill body or other fixed structures. The spring piece includes a locking end cooperating with the teeth and a radially outward control projection located before the locking end. The control projection on the inner wall of the rotating sleeve cooperates with the control structure on the inner wall of the rotating sleeve. The control structure on the inner wall of the rotating sleeve controls the insertion of the locking end into the teeth and allows the locking end to retract by pressing the control projection and releasing the pressure.

[0003] For a self-locking drill chuck, in order to prevent it from exiting the self-locking state due to inertia, a positioning structure is currently provided. A radially outward positioning projection is provided on a spring piece synchronized with the nut in the circumferential direction, and a groove cooperating with the positioning projection is provided on the inner wall of the rotating sleeve.

[0004] Currently, the spring piece is mainly installed inside the front end of the nut and is stuck at the front end of the nut by relying on outward elasticity. After long-term use, the locking end will sag inward due to the fatigue of the control projection. Once it falls into the teeth, the drill chuck cannot be used normally.

[0005] One solution is to wrap the spring piece outside the nut, but this will affect the function of its positioning projection and cause the problem of difficult rotation operation. Summary of the Utility Model

[0006] The technical problem to be solved by the utility model is to provide a self-locking drill chuck, which has the function of preventing it from exiting the self-locking state due to inertia, can also improve the function of preventing the locking end from sagging, and has normal rotation operation. For this purpose, the utility model adopts the following technical solutions:

[0007] A self-locking drill chuck includes a rotating sleeve, a drill body, a nut, a jaw, and a self-locking structure. The self-locking structure includes a ring of teeth and a spring plate. The spring plate is provided with a locking end and a control protrusion near the locking end. The self-locking drill chuck is provided with a spring plate segment that is synchronous with the spring plate in the rotation direction of the nut. The spring plate segment is provided with a positioning protrusion radially outward. The inner wall of the rotating sleeve is provided with a first groove and a second groove that cooperate with the positioning protrusion. When the self-locking drill chuck is in the self-locking state, the positioning protrusion is located in the first groove. When the positioning protrusion is located in the second groove, the self-locking drill chuck is in the unlocked state. It is characterized in that the nut is further provided with a nut sleeve that is wrapped around the outside of the nut and fixedly connected to the nut. The front end of the nut sleeve protrudes from the nut, and an installation part for the spring plate is provided at the protruding part to install the spring plate, so that the spring plate and the nut are synchronous in the rotation direction of the nut. The installation part includes a support part located before the control protrusion. The spring plate is arranged as a cantilever supported by the support part from the part supported by the support part before the control protrusion to the locking end.

[0008] The part of the front end of the nut sleeve protruding from the nut is provided with a hole corresponding to the positioning protrusion. When the spring plate segment rotates together with the nut and the positioning protrusion slides between the first groove and the second groove and is compressed and deformed, the two root parts of the positioning protrusion can elastically deform into the hole.

[0009] On the basis of adopting the above technical solution, the present utility model can further adopt the following technical solutions, or use these further technical solutions in combination:

[0010] The spring plate segment is a segment of the spring plate.

[0011] One spring plate is provided at the front end of the nut sleeve, and the spring plate surrounds more than 300° of the central angle of the front end of the nut sleeve.

[0012] The spring plate is entirely surrounded outside the installation part of the front end of the nut sleeve protruding from the nut and is installed on the nut sleeve from the outside.

[0013] A plurality of the positioning protrusions are arranged on the spring plate along the length direction of the spring plate.

[0014] The tail end of the spring plate is provided with a bend. There is a section of inward protrusion before the control protrusion. The spring plate forms a positioning with the edge of the installation part through the inward protrusion and the bend, and the support part supports in front of the inward protrusion.

[0015] The nut sleeve is provided with a second hole between the two ends of the installation part, and both sides of the second hole cooperate with the inward protrusion and the bend respectively.

[0016] The front end of the nut sleeve has several inward bends to form grooves, and the key on the inner wall of the rotating sleeve is inserted into the grooves.

[0017] The two sides of the front end of the nut sleeve that are bent inward are bent downward to form a driving fit with the keys on the inner wall of the rotating sleeve in both the locked state and when unlocking. The two sides of the inward bend also have downward bends.

[0018] The rear end of the nut is supported on the step in the middle of the drill body by a ring of steel balls and washers. The rear end of the nut sleeve has a rearward extending ring, and the steel balls are arranged in the rearward extending ring. The steel balls are forced to extrude the extending ring outward, enhancing the anti-loosening effect.

[0019] There is a section of protrusion inward in front of the control protrusion, and the supporting part is supported in front of the inward protrusion.

[0020] The self-locking drill chuck provided by the present utility model can, when the elastic piece is installed outside, not only normally provide the positioning function and effectively maintain the self-locking state during the operation of the drill chuck, but also when sliding between the two positioning grooves, the elastic piece part that plays the positioning role can be fully deformed, fully ensuring the normal rotation operation, and the self-locking structure also has the function of preventing the end of the lock from sagging. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is an exploded view of an embodiment of the present utility model.

[0022] Figure 2 It is a cross-sectional view of an embodiment of the present utility model.

[0023] Figure 3 It is a schematic assembly diagram of the elastic piece and the nut of an embodiment of the present utility model.

[0024] Figure 4 It is a cross-sectional view of the elastic piece and the nut of an embodiment of the present utility model.

[0025] Figure 5 It is when an embodiment of the present utility model is in the unlocked state Figure 2 A-A cross-sectional view.

[0026] Figure 6 It is when an embodiment of the present utility model is between the unlocked state and the self-locked state Figure 2 A-A cross-sectional view.

[0027] Figure 7 It is when an embodiment of the present utility model is in the self-locked state Figure 2 A-A cross-sectional view.

[0028] Figure 8 It is a schematic diagram of another embodiment of the nut sleeve.

[0029] Figure 9 It is a schematic diagram of another embodiment of the drill chuck of the present utility model, which applies Figure 8Nut sleeve shown.

[0030] Figure 10 for Figure 9 BB cross-sectional view. DETAILED DESCRIPTION

[0031] Refer to the attached Figure 1-7 The self-locking drill chuck provided by the present invention comprises a rotating sleeve 2, a drill body 1, a nut 3, a clamping jaw 4, and a self-locking structure. The self-locking structure comprises a ring of teeth 11 and a spring piece 5. The ring of teeth 11 is arranged on the front outer circle of the drill body 1. The spring piece 5 is provided with a locking end 51 and a control protrusion 52 close to the locking end. The rotating sleeve 2 is provided with a control surface 23 that cooperates with the control protrusion 52. The self-locking drill chuck is provided with a spring segment that is synchronized with the spring piece 5 in the direction of nut rotation. In this embodiment, the spring segment is a part of the spring piece 5. This section of the spring segment is provided with a radially outward positioning protrusion 53. The inner wall of the rotating sleeve 2 is provided with a first groove 21 and a second groove 22 that cooperate with the positioning protrusion 53. When the self-locking drill chuck is in the self-locking state, the positioning protrusion 53 is located in the first groove 21. When the positioning protrusion 53 is located in the second groove 22, the self-locking drill chuck is in the unlocked state. The nut 2 is also provided with a nut sleeve 6 wrapped around its outside and fixedly connected to the nut 2 (such as an interference fit connection). The front end of the nut sleeve 6 protrudes from the nut, and a spring installation portion 61 is provided on the protruding portion to install the spring 5, so that the spring 5 and the nut 3 are synchronized in the rotation direction of the nut. The installation portion 61 includes a support portion 62 located before the control protrusion. The spring 5 is provided as a cantilever supported by the support portion 62 from the portion supported by the support portion 62 before the control protrusion 52 to the locking end 51.

[0032] The front end of the nut sleeve 6 protrudes from the nut 3 to form a hole 63 corresponding to the positioning protrusion 53. When the spring piece rotates with the nut and the positioning protrusion 53 slides between the first groove 21 and the second groove 22 and is compressed and deformed, the roots 56 at both ends of the positioning protrusion 53 can be elastically deformed into the hole 63.

[0033] A piece of the elastic sheet 5 is provided at the front end of the nut sleeve, and the elastic sheet 5 surrounds more than 300° of the central angle at the front end of the nut sleeve. The whole elastic sheet 5 is surrounded outside the installation part 61 protruding from the front end of the nut of the nut sleeve, and is installed on the nut sleeve 6 from the outside. A bend 54 is provided at the tail end of the elastic sheet 5, and there is a protruding part 55 inward in front of the control protrusion 52. The elastic sheet 5 forms positioning with the edge of the installation part 61 through the protruding part 55 inward and the bend 54, and the supporting part 52 is supported in front of the protruding part 55 inward. A hole 68 can be provided between the two ends of the installation part of the nut sleeve, and the hole 68 is for the locking end to move. The two sides of the hole cooperate with the protruding part 55 inward and the bend 54 respectively, so as to further ensure the structural strength of the front end of the nut sleeve 6, and at the same time, it is very convenient for the elastic sheet 5 of the present invention to be installed from the outside and for the locking end to move.

[0034] A plurality of the positioning protrusions 53 are arranged on the elastic sheet 2 along the length direction of the elastic sheet 2. Corresponding first grooves 21 and second grooves 22 are provided on the inner wall of the rotating sleeve 2.

[0035] As Figure 8 shown, it provides another implementation manner of the nut sleeve. In Figure 1-7 the implementation manner, the front end of the nut sleeve 3 has several inward bends 64 to form grooves 65, and the key 24 on the inner wall of the rotating sleeve 2 is inserted into the grooves 65, and the bends 64 on both sides cooperate with the key on the inner wall of the rotating sleeve to form a driving fit in the locked state and when unlocking. In Figure 8 it, there are also downward bends 66 on both sides of the inward bend.

[0036] As Figure 9 、 10 shown, it provides another implementation manner of the support structure at the rear end of the nut 3, and also applies the Figure 8 nut sleeve shown. In Figure 1-7 the implementation manner, the support structure adopts the implementation manner of using a bearing ring 7 and a washer 8 to support on the step in the middle of the drill body 1. The bearing ring 7 includes a bearing frame, and a plurality of bearing steel ball holes are arranged on the bearing frame along the circumferential direction, and steel balls are embedded in the holes. In Figure 9 the implementation manner shown, only one circle of steel balls 71 and a washer 8 are used, and the support structure adopts the implementation manner of using one circle of steel balls 71 and a washer 8 to support on the step in the middle of the drill body 1. The rear end of the nut sleeve has a backward extension ring 67, and the backward extension ring 67 limits the one circle of steel balls 71 on the outside of the one circle of steel balls 71. The steel balls are forced to extrude the extension ring outward, strengthening the anti-loosening effect.

[0037] The above are only specific embodiments of the present utility model, but the structural features of the present utility model are not limited thereto. Any changes or modifications made by those skilled in the art within the scope of the present utility model are covered by the protection scope of the present utility model.

Claims

1. A self-locking drill chuck, comprising a rotating sleeve, a drill body, a nut, a jaw, and a self-locking structure. The self-locking structure includes a ring of teeth and a spring plate. The spring plate is provided with a locking end and a control protrusion near the locking end. The self-locking drill chuck is provided with a spring plate segment that is synchronous with the spring plate in the rotation direction of the nut. The spring plate segment is provided with a positioning protrusion that protrudes radially outward. The inner wall of the rotating sleeve is provided with a first groove and a second groove that cooperate with the positioning protrusion. When the self-locking drill chuck is in the self-locking state, the positioning protrusion is located in the first groove. When the positioning protrusion is located in the second groove, the self-locking drill chuck is in the unlocked state; it is characterized in that The nut is also provided with a nut sleeve that wraps around the outside of the nut and is fixedly connected to the nut. The front end of the nut sleeve protrudes from the nut, and an installation part for the elastic piece is provided at the protruding part to install the elastic piece, so that the elastic piece and the nut are synchronized in the rotation direction of the nut. The installation part includes a support part located before the control protrusion, and the elastic piece is arranged as a cantilever supported by the support part from the part supported by the support part before the control protrusion to the locking end; A hole corresponding to the positioning protrusion is provided at the part where the front end of the nut sleeve protrudes from the nut. When the elastic piece segment rotates together with the nut and the positioning protrusion slides between the first groove and the second groove and is compressed and deformed, the two ends of the root of the positioning protrusion can elastically deform into the hole.

2. The self-locking drill chuck according to claim 1, wherein, The elastic piece segment is a segment of the elastic piece.

3. The self-locking drill chuck according to claim 2, wherein, One elastic piece is provided at the front end of the nut sleeve, and the elastic piece surrounds more than 300° of the central angle of the front end of the nut sleeve.

4. A self-locking drill chuck according to claim 1, characterized in that, The elastic piece is entirely surrounded outside the installation part where the nut sleeve protrudes from the front end of the nut, and is installed on the nut sleeve from the outside.

5. The self-locking drill chuck according to claim 3, characterized in that, A plurality of the positioning protrusions are arranged along the length direction of the elastic piece on the elastic piece.

6. The self-locking drill chuck according to claim 4, wherein, A bend is provided at the tail end of the elastic piece, and there is a protrusion inward before the control protrusion. The elastic piece forms a positioning with the edge of the installation part through the inward protrusion and the bend, and the support part supports in front of the inward protrusion.

7. The self-locking drill chuck according to claim 6, characterized in that, A second hole is provided between the two ends of the installation part of the nut sleeve, and both sides of the second hole cooperate with the inward protrusion and the bend respectively.

8. The self-locking drill chuck according to claim 7, characterized in that, The front end of the nut sleeve has several inward bends to form grooves, and the key on the inner wall of the rotating sleeve is inserted into the grooves.

9. The self-locking drill chuck according to claim 8, characterized in that, Both sides of the inward bend at the front end of the nut sleeve are bent downward to form a driving cooperation with the key on the inner wall of the rotating sleeve in the locked state and when unlocking, and both sides of the inward bend also have downward bends.

10. A self-locking drill chuck according to claim 1, characterized in that, The rear end of the nut is supported on the step in the middle of the drill body by a ring of steel balls and washers. The rear end of the nut sleeve has a rearward extending ring, and the steel balls are arranged in the rearward extending ring. The steel balls are forced to extrude the extending ring outward to enhance the anti-loosening effect.

11. A self-locking drill chuck according to claim 1, 2, 3, 4, 5 or 10, characterized in that, There is a protrusion inward before the control protrusion, and the support part supports in front of the inward protrusion.

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