Drill chuck

Abstract

The utility model provides a drill chuck, and belongs to the technical field of drill chucks. The problems that when an existing drill chuck is locked, the reminding volume is low, and a lining is prone to deformation are solved. The drill chuck comprises a drill body and a clamping jaw arranged in the drill body, the drill body is sleeved with a nut and a bush, the clamping jaw is in threaded connection with the nut, a jump spring is further arranged in the bush, the inner wall of the bush protrudes inwards in the circumferential direction to form a bush protruding part, and the outer wall of the jump spring is provided with a jump spring protruding part protruding outwards. A receding notch which is concave outwards in the radial direction is formed in the inner side wall of one side of the bush protruding part of the bush, a receding notch which penetrates through the outer side face of the bush in the radial direction is formed in the other side of the bush protruding part of the bush, and when the bush rotates relative to the jump spring, the jump spring protruding part crosses the bush protruding part from one side of the bush protruding part and is embedded into the receding notch. The jump spring convex part of the drill chuck can be recovered to be in an unextruded state after crossing the bushing convex part, so that the overall vibration amplification of the jump spring is increased, and the sound of collision between the lock head of the jump spring and the one-way ratchet is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of drill chucks and relates to a drill chuck. Background Art

[0002] The drill chuck is used on DC or AC electric drills. Its biggest advantage is that it is easy to lock. The working principle of the drill chuck is to rotate the handle to open or close the three jaws, thereby loosening or clamping the drill bit.

[0003] As the applicant's previous patent application document [Authorization Announcement No.: CN210789283U] discloses a self-locking structure of a hand-tight drill chuck, including a drill body, a clamping jaw, a nut and a long sleeve, a plurality of inclined holes are opened on the drill body, the clamping jaw is arranged in the inclined hole, the nut sleeve is arranged at the outer edge of the clamping jaw, the nut and the clamping jaw are threadedly matched, an inner lining is provided on the inner side of the long sleeve, an annular groove is opened on the inner wall of the lining, an annular boss is formed on the inner wall of the lining, an unlocking block and a plurality of driving protrusions are provided on the inner side of the top of the annular boss, an inner flange is provided at a position corresponding to the height of the driving protrusion, and a self-locking A locking bevel, a channel is left between the driving protrusion and the inner wall of the lining, and several locking protrusions are provided at the bottom of the nut. The locking protrusion is placed on the top of the annular boss and is located between adjacent driving protrusions. A period of idling gap is left between the driving protrusion and the locking protrusion, and a channel is also left between the locking protrusion and the inner wall of the lining. A jumping spring is provided in the channel, and an outward-protruding outer flange is provided on the jumping spring. Under the elastic action of the jumping spring, the outer flange rests on the inner wall of the lining, and a locking head is provided at one end of the jumping spring. The outer side of the locking head cooperates with the self-locking bevel, and the inner side of the locking head cooperates with the unlocking block. An inward-protruding blocking part is also provided on the jumping spring, and the blocking part cooperates with the locking protrusion. A one-way ratchet is provided on the outer wall of the drill body.

[0004] When the above structure locks the workpiece of the clamping jaws, the jumper spring and the inner wall of the lining slide relative to each other, and the outer flange of the jumper spring slides from one side of the inner flange to the other side, and the outer side of the lock head cooperates with the self-locking inclined surface, so that the end of the lock head is clamped on the one-way ratchet on the outside of the drill body. Continuing to rotate the long sleeve, the jumper spring will elastically collide with the one-way ratchet on the outside of the drill body and make a "click" locking sound, thereby achieving locking positioning; when in use, the outer flange of the jumper spring slides from one side of the inner flange to the other side, making the outer flange of the jumper spring easily subject to extrusion restriction, resulting in a decrease in the vibration amplification of the jumper spring and a smaller volume, which affects the reminder volume during locking, and when the outer flange of the jumper spring presses against one side of the inner flange of the lining, the thickness of the lining at this point is relatively small, and it is easily squeezed and deformed. Utility Model Content

[0005] The purpose of the present invention is to solve the above problems in the existing technology and propose a drill chuck. The technical problem to be solved by the present invention is: how to solve the problem that the existing drill chuck has a low reminder volume and a bushing that is easily deformed when locked.

[0006] The purpose of this utility model can be achieved through the following technical solutions:

[0007] A drill chuck comprises a drill body and a clamping jaw arranged in the drill body, a nut and a bushing being sleeved on the drill body, the clamping jaw being threadedly connected to the nut, a jumper spring being further provided in the bushing, the inner wall of the bushing protruding inwardly along the circumferential direction to form a bushing convex portion, and the outer wall of the jumper spring having a jumper spring convex portion protruding outwardly, characterized in that the bushing is provided with a radially outwardly recessed clearance notch on the inner side wall on one side of the bushing convex portion, and the bushing is provided with a radially radially penetrating outer side surface of the bushing on the other side of the bushing convex portion, and when the bushing rotates relative to the jumper spring, the jumper spring convex portion passes over the bushing convex portion from one side of the bushing convex portion and is embedded in the clearance notch.

[0008] Working principle: When the jaws do not clamp the workpiece, the workpiece is embedded in the jaws of the drill body. By rotating the bushing, the nut is subject to less resistance at this time, and the bushing will drive the jumper spring and the nut to rotate. The jaws connected to the nut thread gradually close and slowly clamp the workpiece. The resistance to the nut gradually increases, causing the jumper spring convex part to slide relative to the bushing in the gap, until the lock head of the jumper spring slides along the self-locking surface of the bushing. The lock head of the jumper spring can elastically collide with the one-way ratchet of the drill body during continuous rotation, and the jumper spring convex part of the jumper spring is locked. It also passes over the bushing convex part and is embedded in the avoidance notch of the bushing, and the avoidance notch penetrates the outer side surface of the bushing radially. Therefore, the jumper spring convex part returns to the un-squeezed state after passing over the bushing convex part, so that the overall vibration amplification of the jumper spring is increased, the sound of the jumper spring lock head colliding with the one-way ratchet is increased, and the reminder volume is increased. Moreover, the jumper spring convex part is not restricted by squeezing when it slides relatively over the bushing convex part, which avoids the jumper spring convex part being fixed in the bushing and causing the bushing to deform, further improving the stability of the drill chuck.

[0009] In the above-mentioned drill chuck, there are multiple bushing protrusions, all of which are evenly distributed along the circumference of the bushing. There are multiple jumper spring protrusions and they are arranged one-to-one corresponding to the bushing protrusions. The other side of the bushing protrusion is provided with the above-mentioned avoidance gap.

[0010] There are multiple bushing protrusions, so that the jumper spring protrusion has multiple bushing protrusions to limit and guide it when it rotates, and corresponding avoidance gaps are also opened to reduce the collision between the jumper spring protrusion and the bushing after it passes over the bushing protrusion, thereby increasing the vibration amplitude of the jumper spring protrusion and further increasing the reminder volume.

[0011] In the above-mentioned drill chuck, the bushing protrusion has a guide surface, and the guide surface is inclined inward from one side connected to the clearance notch to the other side.

[0012] The setting of the guide surface makes the sliding of the jumper spring protrusion smoother, which can improve the stability of the drill chuck.

[0013] In the above-mentioned drill chuck, the walls on both sides of the avoidance gap have guiding surfaces that move away from each other from the outside to the inside.

[0014] The setting of the guide surface can guide the reverse sliding out of the jumper spring protrusion, thereby ensuring the smooth use of the drill chuck.

[0015] In the above-mentioned drill chuck, the outer side wall of the bushing is provided with a reinforcement strip near the avoidance notch, and the length direction of the reinforcement strip is arranged along the length direction of the bushing.

[0016] Since the bushing is provided with a plurality of avoidance notches, the strength of the bushing is reduced, and therefore a plurality of reinforcing strips are provided to improve the overall strength of the bushing without affecting the normal use of the bushing.

[0017] Compared with the prior art, the drill chuck has the following advantages: the jumper spring gradually separates from the unlocking block in the bushing, the locking head of the jumper spring can elastically collide with the one-way ratchet of the drill body during continuous rotation, and the jumping spring convex portion of the jumper spring also passes over the bushing convex portion and is embedded in the avoidance notch of the bushing, so that the overall vibration amplification of the jumper spring is greater, thereby increasing the sound of the collision between the locking head of the jumper spring and the one-way ratchet, and increasing the overall reminder volume, and the jumping spring convex portion is not squeezed and restricted when it slides relatively over the bushing convex portion, avoiding the jumper spring convex portion being fixed in the bushing and causing the bushing to deform, further improving the stability of the drill chuck. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a front view of the present utility model.

[0019] Figure 2 yes Figure 1 Cross-sectional view of AA in the figure.

[0020] Figure 3 yes Figure 1 Cross-sectional view of the BB.

[0021] Figure 4 It is a cross-sectional view of the utility model after the jumper spring is locked.

[0022] Figure 5 It is a structural diagram of the bushing in the utility model.

[0023] In the figure, 1. drill body; 11. one-way ratchet; 2. clamping jaw; 3. nut; 4. bushing; 41. bushing protrusion; 41a. guide surface; 42. clearance gap; 43. avoidance gap; 43a. guide surface; 44. reinforcement strip; 45. self-locking surface; 5. jumper spring; 51. jumper spring protrusion; 52. locking head. DETAILED DESCRIPTION

[0024] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

[0025] like Figure 1 As shown, the drill chuck includes a drill body 1 and a clamping jaw 2 arranged in the drill body 1. A nut 3 and a bushing 4 are sleeved on the drill body 1, and the clamping jaw 2 is threadedly connected to the nut 3.

[0026] like Figure 1-5 As shown, a jumper spring 5 is also provided in the bushing 4. The inner wall of the bushing 4 protrudes inward along the circumferential direction to form a bushing protrusion 41. The outer wall of the jumper spring 5 has a jumper spring protrusion 51 protruding outward. The bushing 4 is provided with a radially outwardly recessed clearance notch 42 on the inner side wall on one side of the bushing protrusion 41. The inner side wall of the bushing 4 also has a radially inwardly protruding self-locking surface 45. A one-way ratchet 11 is provided on the outer side wall of the drill body 1. The locking head 52 of the jumper spring 5 passes over the self-locking surface 45 and is clamped on the one-way ratchet 11. The bushing 4 is provided with a radially penetrating outer side surface avoidance notch 43 on the other side of the bushing protrusion 41. When the bushing 4 rotates relative to the jumper spring 5, the jumper spring protrusion 51 passes over the bushing protrusion 41 from one side of the bushing protrusion 41 and is embedded in the avoidance notch 43.

[0027] Working principle: When the jaws 2 do not clamp the workpiece, the workpiece is embedded in the jaws 2 of the drill body 1. By rotating the bushing 4, the nut 3 is subject to less resistance at this time, and the bushing 4 will drive the jumper spring 5 and the nut 3 to rotate. The jaws 2 threadedly connected with the nut 3 gradually close and slowly clamp the workpiece. The resistance encountered by the nut 3 at this time increases, causing the jumper spring convex portion 51 to slide relative to the bushing 4 in the clearance notch 42, until the locking head 52 of the jumper spring 5 slides along the self-locking surface 45 of the bushing 4. The locking head 52 of the jumper spring 5 can elastically collide with the one-way ratchet 11 of the drill body 1 during continuous rotation, and the jumper spring convex portion 51 of the jumper spring 5 also It passes over the bushing protrusion 41 and is embedded in the avoidance notch 43 of the bushing 4, and the avoidance notch 43 radially penetrates the outer surface of the bushing 4. Therefore, the jumper spring protrusion 51 returns to an un-squeezed state after passing over the bushing protrusion 41, so that the overall vibration amplification of the jumper spring 5 is increased, thereby increasing the sound of the lock head 52 of the jumper spring 5 colliding with the one-way ratchet 11, and increasing the overall reminder volume. In addition, the jumper spring protrusion 51 is not restricted by squeezing when it slides relatively over the bushing protrusion 41, thereby avoiding the jumper spring protrusion 51 being fixed in the bushing 4 and causing the bushing 4 to deform, further improving the stability of the drill chuck.

[0028] like Figure 3-5 As shown, there are multiple bushing protrusions 41, which are evenly distributed along the circumference of the bushing 4. There are multiple jumper spring protrusions 51, which are arranged one-to-one with the bushing protrusions 41. The other side of each bushing protrusion 41 is provided with the above-mentioned avoidance notch 43. In this embodiment, there are three bushing protrusions 41.

[0029] like Figure 3-5 As shown, the bushing protrusion 41 has a guide surface 41a, which is inclined inward from one side to the other side where it connects with the avoidance gap 42, and the mouth walls on both sides of the avoidance gap 43 have guide surfaces 43a that move away from each other from the outside to the inside.

[0030] like Figure 5 As shown, the outer side wall of the bushing 4 is provided with a reinforcement strip 44 near the avoidance notch 43 , and the length direction of the reinforcement strip 44 is arranged along the length direction of the bushing 4 .

[0031] The specific embodiments described herein are merely illustrative of the spirit of the present invention. Persons skilled in the art may make various modifications, additions, or substitutions to the described specific embodiments without departing from the spirit of the present invention or exceeding the scope defined by the appended claims.

Claims

1. A drill chuck, comprising a drill body (1) and a clamping jaw (2) arranged in the drill body (1), wherein a nut (3) and a bushing (4) are sleeved on the drill body (1), the clamping jaw (2) is threadedly connected to the nut (3), a jumper spring (5) is further provided in the bushing (4), the inner wall of the bushing (4) protrudes inwardly along the circumferential direction to form a bushing convex portion (41), and the outer wall of the jumper spring (5) has a jumper spring convex portion (51) protruding outward, characterized in that: The bushing (4) is provided with a radially outwardly recessed relief notch (42) on the inner side wall of one side of the bushing protrusion (41), and a radially extending relief notch (43) is provided on the other side of the bushing protrusion (41) of the bushing (4). The relief notch (43) penetrates the outer side surface of the bushing (4) in the radial direction. When the bushing (4) rotates relative to the jumper spring (5), the jumper spring protrusion (51) passes over the bushing protrusion (41) from one side of the bushing protrusion (41) and is embedded in the relief notch (43).

2. The drill chuck according to claim 1, characterized in that There are multiple bushing protrusions (41), all of which are evenly distributed along the circumference of the bushing (4). There are multiple jumper spring protrusions (51) and they are arranged one-to-one corresponding to the bushing protrusions (41). The other side of each bushing protrusion (41) is provided with the above-mentioned avoidance notch (43).

3. The drill chuck according to claim 1 or 2, characterized in that: The bushing protrusion (41) has a guide surface (41a), and the guide surface (41a) is arranged to be inclined inward from one side where it is connected to the clearance notch (42) to the other side.

4. The drill chuck according to claim 1 or 2, characterized in that: The walls on both sides of the avoidance gap (43) are provided with guide surfaces (43a) that are away from each other from the outside to the inside.

5. The drill chuck according to claim 1 or 2, characterized in that: The outer side wall of the bushing (4) is provided with a reinforcement strip (44) near the avoidance notch (43), and the length direction of the reinforcement strip (44) is arranged along the length direction of the bushing (4).

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