A drill chuck

Abstract

The utility model provides a drill chuck belongs to mechanical technical field. It solved how to improve the problem of the use safety of drill chuck. This drill chuck includes the drill body of inside slide to set up several clamping jaw and the outer sleeve of rotation sleeve in the drill body outside, is equipped with the nut of around the drill body and with the screw joint of clamping jaw in the outer sleeve, and the lock spring and the locking ring of sleeve in the lock spring with the nut outer wall circumferential positioning, locking ring inner wall circumferential has several lock teeth, the inner wall of outer sleeve opens at least two clamping grooves, and the lock piece and the limit head on the lock spring, when the limit head is positioned in a clamping groove, the lock piece separates with the lock tooth under the push of the inner wall of outer sleeve, and the outer sleeve rotates along the tightening direction by the limit head drive nut, when the nut compresses the locking ring and the outer sleeve relatively rotates, the limit head can be positioned in the adjacent clamping groove, and the outer sleeve releases the lock piece and makes it along the loosening direction and lock tooth clamping, and the keyway structure is equipped between the outer sleeve and the nut, when the lock piece locks on the lock tooth, can drive the nut and rotate along the locking direction. This drill chuck can improve the use safety of drill chuck.

Description

Technical Field

[0001] This utility model belongs to the field of mechanical technology and relates to a drill chuck. Background Technology

[0002] Drill chucks are an indispensable part of electric drills. For example, a novel hand-tightening drill chuck disclosed in Chinese Patent (Authorization Announcement No.: CN202028802U) includes a drill body disposed inside an outer sleeve and fitted with a nut. The nut is fastened to the outer sleeve. The inner wall of the drill body is provided with a sliding groove and a jaw hole, which corresponds to the nut. The inner wall of the drill body is provided with three or more jaws that are threaded into the nut. The jaws slide in conjunction with the sliding groove. A tail cap is provided at one end of the outer sleeve and engages with it.

[0003] The comparative document describes a method where the nut is positioned using an outer sleeve, and during operation, the sleeve rotates the nut, causing the nut and jaws to slide upwards or downwards through a threaded engagement, thus clamping or releasing the drill bit. However, in actual operation, especially during use, the electric drill exerts a reverse turning force on the board or wall, and the vibration generated during impact can easily reduce the thread fit between the nut and jaws, leading to clamping failure of the jaws and posing a significant safety hazard. Summary of the Invention

[0004] The purpose of this utility model is to address the aforementioned problems in the existing technology by proposing a drill chuck. The technical problem to be solved by this utility model is: how to improve the safety of using the drill chuck.

[0005] The objective of this utility model can be achieved through the following technical solution: A drill chuck includes a drill body with several claws slidingly inserted internally and an outer sleeve rotatably fitted over the drill body. The outer sleeve contains a nut arranged around the drill body and screwed to the claws. The outer sleeve also contains a spring circumferentially positioned against the outer wall of the nut and a locking ring fitted over the spring. The inner wall of the locking ring has several locking teeth circumferentially. At least two locking grooves are formed on the inner wall of the outer sleeve. The spring has a locking plate and a limiting head. When the limiting head is circumferentially positioned in one of the grooves... When the locking piece is in the locking slot, it separates from the locking tooth under the push of the inner wall of the outer sleeve, and the outer sleeve drives the nut to rotate in the tightening direction through the limiting head. When the nut presses against the locking ring and the outer sleeve rotates relative to the nut, the limiting head can be circumferentially positioned in the adjacent locking slot. The outer sleeve releases the locking piece so that the locking piece can be locked with the locking tooth in the loosening direction. A keyway structure is also provided between the outer sleeve and the nut, which can drive the nut to rotate in the tightening direction when the locking piece is locked on the locking tooth.

[0006] The operating principle of this drill chuck is as follows: After the drill bit is placed on the drill chuck and positioned between several jaws, the operator manually tightens the outer sleeve. Because the spring provides circumferential positioning through a limiting head and one of the locking grooves on the inner wall of the outer sleeve, the outer sleeve, via the spring, drives the nut and each jaw to engage with the threads. This causes each jaw to slide vertically forward within the drill body under the action of the threads, resulting in a synchronized inward tightening of the front ends of each jaw, thus gradually clamping the drill bit. Under this condition, when the tightening of each jaw reaches its limit, the operator can still tighten the outer sleeve. However, since the jaws can no longer move downwards, the limiting head disengages from the aforementioned locking groove and inserts into an adjacent locking groove under the continuous rotation of the outer sleeve, thereby... The locking plate, originally deformed by inward compression, rotates inward to reset, ultimately locking the locking plate and one of the locking teeth on the inner wall of the locking ring. In this state, the nuts, originally threaded with the jaws, are at their limit due to the tightening of the jaws, thus maintaining their position as the outer sleeve is tightened further. Conversely, the keyway structure causes the nut, in its threaded engagement with the jaws, to drive the springs to apply pressure to the locking ring, ultimately securing the locking ring firmly against the outer wall of the drill bit for circumferential positioning. The locking plate and locking teeth produce a clicking sound, indicating to the operator that the locking action is complete. Furthermore, through the cooperation of all components, the drill bit to be installed is firmly clamped, effectively preventing it from loosening during use and ensuring higher safety.

[0007] In the aforementioned drill chuck, the spring includes a ring-shaped frame and a strip-shaped retaining plate bent along its length. The retaining plate is arranged laterally and has an upper protrusion on its upper side. The upper protrusion is fixed to the outer wall of the frame, forming a gap between the upper side of the retaining plate and the bottom surface of the frame. A locking plate is formed at one end of the retaining plate, and a limiting head is formed at the other end of the retaining plate. A positioning head is also formed at the end of the retaining plate with the locking plate. The positioning head and the locking plate are spaced apart along the width direction of the retaining plate. A clearance groove is also provided on the inner wall of the outer sleeve. When the positioning head is embedded in the clearance groove, the locking plate can separate from the inner wall of the outer sleeve and engage with the locking teeth. As a further specific solution, the spring includes two parts: a ring-shaped frame and a strip-shaped retaining plate. The frame structure ensures the overall structural consistency and robustness of the spring. The retaining plate is fixed to the outer wall of the frame via an upper protrusion. While ensuring a secure connection, a gap between the two allows for sufficient elastic deformation of the retaining plate during assembly. Based on this structure, the positioning head and locking plate are formed on the same end of the retaining plate. In actual operation, the positioning head, as the main force-bearing point, first transmits force to the end of the retaining plate, which then drives the locking plate to deform inward or outward. During this process, the deformation amplitude of the locking plate is actually less than that of the positioning head. This design aims to prevent complete locking between the locking plate and the locking ring; otherwise, the locking plate and locking teeth would not engage. Subsequently, when the outer sleeve is continued to be tightened, even with the abutment of the spline and the notch sidewall, the outer sleeve cannot drive the nut to rotate a certain extent through the spring. Therefore, the nut cannot fully compress the locking ring. It is worth mentioning that this application uses two additional slots in the outer sleeve to cooperate with the limiting head. During operation, in the unlocked state, the limiting head located at the other end of the retaining plate is embedded and positioned in one of the slots. After the drill bit is locked, the limiting head is embedded and positioned in the other slot. Thus, the position of the spring is assisted in the two states. By switching the limiting head back and forth between the two slots, the situation where the locking plate and locking teeth are not properly engaged in the locked state is avoided. At the same time, it is prevented that the locking plate does not reach the expected position when it is unlocked, and still makes a clicking noise due to contact with the locking teeth of the locking ring.

[0008] In the aforementioned drill chuck, the keyway structure consists of a spline formed on the inner wall of the outer sleeve and a notch formed on the bottom wall of the nut, with the spline located within the notch. Specifically, the keyway structure comprises two parts: a spline and a notch. The nut is driven by the mating of the outer wall of the spline and the inner wall of the notch. Alternatively, the keyway structure can also be achieved through spline-to-spline mating, meaning that splines are formed on both the inner wall of the outer sleeve and the bottom wall of the nut.

[0009] In the aforementioned drill chuck, both the spline and the notch are elongated, with the notch being longer than the spline. When the spring rotates the nut and causes the limiting head to disengage from one of the locking slots and engage with an adjacent locking slot, one end of the spline separates from one sidewall of the notch, while the other end abuts against the other sidewall of the notch. Specifically, the clearance between each spline and its corresponding notch is equal to the distance between two locking slots in the same group. That is, in the unlocked state, the limiting head is embedded and positioned in one locking slot, with the corresponding spline and notch abutting against one sidewall. Conversely, in the locked state, the limiting head is embedded and positioned in the other locking slot, with the corresponding spline and notch abutting against the other sidewall. This ensures that during unlocking and locking, the interaction of the two parts prevents all force from concentrating between the outer sleeve and the spring, effectively improving the service life of the spring.

[0010] In the aforementioned drill chuck, the retaining plate has a lower protrusion on its lower side, and a limiting groove is vertically formed on the outer wall of the nut. The lower protrusion is embedded in and positioned circumferentially within the limiting groove. This configuration achieves circumferential positioning of the spring and the nut. As a further specific solution, the number of retaining plates formed on the frame can be two or more to ensure a stable connection between the spring and the nut. Simultaneously, corresponding locking grooves and clearance grooves need to be formed on the inner wall of the outer sleeve for each retaining plate, further improving the positioning firmness of each jaw through multi-point cooperation.

[0011] In the aforementioned drill chuck, the locking ring has an L-shaped cross-section, the outer wall of the drill body has a stepped surface along the circumference, and the inner wall of the lower edge of the locking ring is formed with a plurality of locking teeth along the circumference. A plurality of balls are arranged circumferentially between the frame and the locking ring. The top surface of the locking ring abuts against the stepped surface of the drill body, and a transition pad is provided on the inner wall of the top of the locking ring. Each ball abuts against the transition pad and the outer wall of the top of the frame. This arrangement allows for the arrangement of the locking teeth within a limited space, ensuring full engagement between the locking plate and the locking teeth. Furthermore, the use of balls avoids severe sliding friction between the spring and the locking ring during the tightening of the outer sleeve, preventing excessive wear. The transition pad also prevents uneven circumferential force on the locking ring caused by the balls applying pressure to it.

[0012] In the aforementioned drill chuck, the upper side of the transition pad has several lower locking teeth along its circumferential direction, and the upper inner wall of the locking ring has several upper locking teeth along its circumferential direction. These upper and lower locking teeth mesh in a one-to-one correspondence. This arrangement ensures the secure assembly of the transition pad, preventing it from rolling along with the balls and avoiding sliding friction between the transition pad and the upper inner wall of the locking ring, which could cause rapid wear of the transition pad. Alternatively, a groove can be formed along the circumferential direction on the upper inner wall of the locking ring, and the transition pad can be engaged in the groove.

[0013] Compared with existing technologies, this drill chuck has the following advantages:

[0014] 1. Through the cooperation of the limiting head and two locking slots, the spring can make the locking plate elastically deform and engage or disengage with the locking teeth on the locking ring when the drill chuck switches between two states. Under this premise, the keyway structure can further push the nut to tighten or loosen the locking ring, ensuring the firmness of each jaw in holding the drill bit and effectively improving the safety of use.

[0015] 2. By setting the transition pad, uneven force on the locking ring in the circumferential direction is avoided, ensuring the positioning of the locking ring in the circumferential direction is firm. Attached Figure Description

[0016] Figure 1 This is the front view of the drill chuck.

[0017] Figure 2 yes Figure 1 A sectional view taken along the AA direction and a magnified view of a portion thereof.

[0018] Figure 3 yes Figure 1 A sectional view taken along the BB direction and a magnified view of a portion thereof.

[0019] Figure 4 yes Figure 1 A sectional view cut along the CC direction.

[0020] Figure 5 This is a schematic diagram of the spring and nut assembled together.

[0021] Figure 6 This is a structural diagram of the coat.

[0022] Figure 7 This is a schematic diagram of the locking ring.

[0023] Figure 8 This is a schematic diagram of the transition pad structure.

[0024] In the diagram, 1. Drill body; 11. Clamping jaw; 2. Outer sleeve; 21. Relief groove; 22. Spline; 23. Locking groove; 3. Nut; 31. Notch; 32. Limiting groove; 4. Jumping spring; 41. Locking plate; 42. Positioning head; 43. Frame; 44. Retaining plate; 441. Upper protrusion; 442. Limiting head; 443. Lower protrusion; 5. Locking ring; 51. Locking tooth; 52. Transition pad; 521. Lower locking tooth; 53. Upper locking tooth; 6. Ball bearing. Detailed Implementation

[0025] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments.

[0026] like Figure 1 and Figure 2 As shown, this drill chuck includes a cylindrical outer sleeve 2, within which a drill body 1 is vertically arranged. Three jaws 11 pass through the drill body 1, which are then engaged with... Figure 3 Inside the outer sleeve 2, there is a nut 3 surrounding the drill body 1. The inner wall of the nut 3 and the outer wall of the three jaws 11 are connected by a threaded engagement. In addition, inside the outer sleeve 2, there is also a spring 4 that is circumferentially positioned with the outer wall of the nut 3 and a locking ring 5 that is sleeved on the spring 4.

[0027] Combination Figure 5 The spring 4 specifically includes a ring-shaped frame 43 and a strip-shaped retaining plate 44. The retaining plate 44 is arranged horizontally and has an upper protrusion 441 formed in the middle of its upper side, which is arranged vertically. The upper protrusion 441 and the outer wall of the frame 43 are integrally formed, so that a gap is formed between the upper side of the retaining plate 44 and the bottom wall of the frame 43. A lower protrusion 443 is formed in the middle of the lower side of the retaining plate 44, which is arranged vertically. A limiting groove 32 is formed in the outer wall of the nut 3 in the vertical direction. The lower protrusion 443 is embedded in and positioned in the limiting groove 32 in the circumferential direction of the nut 3, thereby achieving the purpose of circumferential positioning of the spring 4 and the nut 3.

[0028] A long, narrow limiting head 442 is provided on the lower edge of one end of the retaining plate 44, and the limiting head 442 is curved in an arc shape along the length direction of the retaining plate 44. A long, narrow positioning head 42 and a locking piece 41 are formed at the other end of the retaining plate 44. The positioning head 42 is curved in an arc shape along the length direction of the retaining plate 44, and the free end of the locking piece 41 is folded outwards towards the frame 43. The limiting head 442 and the locking piece 41 are spaced apart along the width direction of the retaining plate 44. Figure 7 and Figure 8The outer wall of the drill body 1 has a downward-facing stepped surface along the circumferential direction. The locking ring 5 has an L-shaped cross-section and its top outer wall abuts against the stepped surface of the drill body 1. Several locking teeth 51 are formed along the circumferential direction on the inner circumferential wall of the lower edge of the locking cover. Several upper locking teeth 53 are formed along the circumferential direction on the top inner wall of the locking ring 5. Furthermore, a ring-shaped transition pad 52 is provided inside the locking ring 5. Several lower locking teeth 521 are formed along the circumferential direction on the upper side of the transition pad 52. Through the meshing of several upper locking teeth 53 and several lower locking teeth 521, the transition pad 52 is circumferentially positioned inside the locking ring 5. Several balls 6 are provided between the locking ring 5 and the spring 4. The balls 6 are arranged along the circumferential direction of the frame 43, and the balls 6 abut against the top outer wall of the frame 43 and the lower side of the transition pad 52.

[0029] Combination Figure 6 Two locking grooves 23 are provided on the inner wall of the outer sleeve 2 corresponding to the limiting head 442, and the two locking grooves 23 are arranged circumferentially along the inner wall of the outer sleeve 2. In addition, a clearance groove 21 is provided on the inner wall of the outer sleeve 2 corresponding to the positioning head 42. In addition to the above structure, a keyway structure is provided between the outer sleeve 2 and the nut 3. The keyway structure is specifically a notch 31 opened at the bottom of the nut 3 and a spline 22 formed on the inner wall of the outer sleeve 2. The spline 22 is embedded in the notch 31. Both the spline 22 and the notch 31 are elongated, and the length of the spline 22 is less than the length of the notch 31.

[0030] When the drill chuck is in the unlocked state, the limiting head 442 is embedded and positioned in one of the slots 23. At this time, the positioning head 42 is pressed against the inner wall of the outer sleeve 2. Under the squeezing action of the inner wall of the outer sleeve 2, the positioning head 42 is in a state of inward deformation and bending, and together with the locking piece 41, it bends inward to a certain extent, so that the locking piece 41 and the corresponding locking tooth 51 are separated.

[0031] When switching to the locked state, the user needs to place the drill bit between the three jaws 11 and then tighten the outer sleeve 2. At this time, due to the limiting head 442 being limited by the locking groove 23, while the limiting head 442 is still in the locking groove 23, the outer sleeve 2, in conjunction with the spring 4, drives the nut 3 to rotate. Utilizing the threaded engagement between the nut 3 and each jaw 11, each jaw 11 is driven to move forward relative to the outer sleeve 2 and clamp the inserted drill bit. When the outer wall of the front end of each jaw 11 is pressed against the outer wall of the drill bit, the nut 3 can no longer drive the jaws 11 to move. Therefore, the limiting head 442 remains positioned, and only the outer sleeve 2 rotates independently at a certain angle, causing the limiting head 442 to disengage from the locking groove 23 and embed into another locking groove 23. At the same time, the spline 22 also rotates relative to the notch 31 to a certain extent, causing one side wall of itself to separate from one side wall of the notch 31, and causing the other side wall of itself to separate from the notch 31. The other side wall abuts against it. It should be emphasized that, in this state, due to the continued rotation of the outer sleeve 2, the positioning head 42 is embedded in the relief groove 21. In this state, the positioning head 42 is no longer squeezed by the inner wall of the outer sleeve 2. Due to its own material factors, it elastically resets outward and rotates outward along with the locking plate 41. This causes the locking plate 41 to engage with one of the locking teeth 51 on the inner wall of the locking ring 5. In this state, the user continues to screw the outer sleeve 2. During this process, the side walls of the spline 22 and the notch 31 are used as force points. The nut 3 is pushed by the outer sleeve 2 to rotate slightly, so that it moves slightly upward relative to each jaw 11. This causes the nut 3 to apply pressure evenly to the locking ring 5 through the frame 43, several balls 6 and transition pads 52, so that the locking ring 5 is pressed against the drill body 1, thereby achieving the circumferential positioning of the locking ring 5. The locking ring 5 itself engages with the locking plate 41 through the locking teeth 51, thereby ensuring the firmness in the locked state.

[0032] It is worth mentioning that, as an optimization solution, in order to ensure the stability of locking and positioning, the number of retaining plates 44 can be set as many as possible according to the specific structural factors inside the frame 43 and the outer sleeve 2. In this embodiment, there are three retaining plates 44. As a corresponding matching mechanism, a locking groove 23 and a clearance groove 21 are also opened in the outer sleeve 2 for each retaining plate 44. Similarly, the number of splines 22 can also be set to three or more. These splines 22 are arranged circumferentially along the inner wall of the outer sleeve 2. Furthermore, a notch 31 is opened on the bottom wall of the nut 3 for each spline 22, so that each spline 22 is embedded in the notch 31 in a one-to-one correspondence.

[0033] The specific embodiments described herein are merely illustrative examples illustrating the spirit of this utility model. Those skilled in the art to which this utility model pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of this utility model or exceeding the scope defined by the appended claims.

[0034] Although this document frequently uses terms such as drill body 1, gripper 11, outer sleeve 2, clearance groove 21, spline 22, locking groove 23, nut 3, notch 31, limiting groove 32, spring 4, locking plate 41, positioning head 42, frame 43, retaining plate 44, upper protrusion 441, limiting head 442, lower protrusion 443, locking ring 5, locking tooth 51, transition pad 52, lower locking tooth 521, upper locking tooth 53, and ball bearing 6, the possibility of using other terms is not excluded. The use of these terms is merely for the convenience of describing and explaining the essence of this utility model; interpreting them as any additional limitation would contradict the spirit of this utility model.

Claims

1. A drill chuck, comprising a drill body (1) with a plurality of jaws (11) slidably passing through its interior, and an outer sleeve (2) rotatably sleeved outside the drill body (1), wherein the outer sleeve (2) is provided with a nut (3) surrounding the drill body (1) and screwed to the plurality of jaws (11), characterized in that, The outer sleeve (2) is also provided with a spring (4) circumferentially positioned with the outer wall of the nut (3) and a locking ring (5) sleeved on the spring (4). The inner wall of the locking ring (5) has several locking teeth (51) circumferentially. The inner wall of the outer sleeve (2) has at least two locking grooves (23). The spring (4) has a locking piece (41) and a limiting head (442). When the limiting head (442) is circumferentially positioned in one of the locking grooves (23), the locking piece (41) is separated from the locking teeth (51) by the pushing of the inner wall of the outer sleeve (2), and the outer sleeve (2) passes through the limiting head (442). The positioning head (442) drives the nut (3) to rotate in the tightening direction. When the nut (3) presses against the locking ring (5) and the outer sleeve (2) rotates relative to the nut (3), the positioning head (442) can be circumferentially positioned in the adjacent locking groove (23). The outer sleeve (2) releases the locking piece (41) so that the locking piece (41) can be locked with the locking tooth (51) in the loosening direction. A keyway structure is also provided between the outer sleeve (2) and the nut (3) so that when the locking piece (41) is locked on the locking tooth (51), it can drive the nut (3) to rotate in the tightening direction.

2. The drill chuck according to claim 1, characterized in that, The spring (4) includes a ring-shaped frame (43) and a strip-shaped retaining plate (44) bent along its length. The retaining plate (44) is arranged laterally and has an upper protrusion (441) on its upper side. The upper protrusion (441) is fixed to the outer wall of the frame (43) and forms a gap between the upper side of the retaining plate (44) and the bottom surface of the frame (43). The locking plate (41) is formed on one end of the retaining plate (44), and the limiting head (442) is formed on the retaining plate. At the other end of the retaining plate (44), the retaining plate (44) has a positioning head (42) formed at one end of the locking piece (41). The positioning head (42) and the locking piece (41) are spaced apart along the width direction of the retaining plate (44). A clearance groove (21) is also provided on the inner wall of the outer sleeve (2). When the positioning head (42) is embedded in the clearance groove (21), the locking piece (41) can separate from the inner wall of the outer sleeve (2) and be locked with the locking tooth (51).

3. The drill chuck according to claim 2, characterized in that, The keyway structure consists of a spline (22) formed on the inner wall of the outer sleeve (2) and a notch (31) opened on the bottom wall of the nut (3), with the spline (22) located in the notch (31).

4. The drill chuck according to claim 3, characterized in that, Both the spline (22) and the notch (31) are elongated, and the length of the notch (31) is greater than that of the spline (22). When the spring (4) drives the nut (3) to rotate and causes the limiting head (442) to disengage from one of the slots (23) and embed into the adjacent slot, one end of the spline (22) separates from one side wall of the notch (31) and the other end abuts against the other side wall of the notch (31).

5. The drill chuck according to claim 4, characterized in that, The retaining plate (44) has a lower protrusion (443) on its lower side, and a limiting groove (32) is formed on the outer wall of the nut (3) along the vertical direction. The lower protrusion (443) is embedded in and positioned in the limiting groove (32) along the circumference of the nut (3).

6. The drill chuck according to claim 4 or 5, characterized in that, The locking ring (5) has an L-shaped cross-section. The outer wall of the drill body (1) has a stepped surface along the circumference. The inner wall of the lower edge of the locking ring (5) is formed with a plurality of locking teeth (51) along the circumference. A plurality of balls (6) are provided between the frame (43) and the locking ring (5) along the circumference. The top surface of the locking ring (5) abuts against the stepped surface of the drill body (1). A transition pad (52) is provided on the inner wall of the top of the locking ring (5). Each ball (6) abuts against the transition pad (52) and the outer wall of the top of the frame (43).

7. The drill chuck according to claim 6, characterized in that, The upper side of the transition pad (52) has a plurality of lower locking teeth (521) along the circumferential direction, and the upper inner wall of the top of the locking ring (5) has a plurality of upper locking teeth (53) along the circumferential direction. The plurality of upper locking teeth (53) and the plurality of lower locking teeth (521) mesh with each other in a one-to-one correspondence.

Images