Hand-tight drill chuck

Abstract

The utility model provides a hand-tight drill chuck, and belongs to the technical field of drill chucks. The problem of how to improve the locking prompt tone of the drill chuck and prolong the service life at the same time is solved. The hand-tight drill chuck comprises a drill body with one-way ratchets, a nut, a lining and a jump spring, a plurality of limiting protrusions protruding inwards are arranged on the inner wall of the lining, limiting grooves are adjacently formed in the positions, on one sides of the limiting protrusions, of the inner wall of the lining, the jump spring is provided with outer flanges in one-to-one correspondence with the limiting grooves, and the limiting protrusions are arranged on the outer flanges. Through holes are adjacently formed in the inner wall, on the other side of the limiting protrusion, of the lining, the through holes penetrate from the inner wall of the lining to the outer wall of the lining in the radial direction, and the outer flange can slide out of the limiting groove and slide into the through holes along the limiting protrusion by rotating the lining. According to the drill chuck, through the improved design of the through hole in the lining, the structure is simple, the design is reasonable, the locking prompt tone of the drill chuck is greatly improved, and the service life of the drill chuck is greatly prolonged.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of drill chuck, and relates to a hand tight drill chuck. BACKGROUND

[0002] The drill chuck is one of main accessories of the electric tool industry, is mainly used for the direct current and alternating current electric drill of household, and has the biggest advantage that locking is easy, and only needs to hold the front and rear sleeves of the chuck, and is tightened to be used, according to the internal structure of the drill chuck, the electric drill suitable for use is different.

[0003] The existing hand tight drill chuck is generally composed of a drill body, a clamping jaw, a nut, a bearing, a long sleeve and a front sleeve. At the same time, in order to realize clamping self-locking, the existing drill chuck generally has a self-locking structure, such as the self-locking structure of the hand tight drill chuck disclosed in the Chinese patent document CN210789283U filed by the applicant, which comprises an inner liner, an annular groove is formed in the inner wall of the inner liner, an annular boss is formed on the inner wall of the inner liner, an unlocking block and a plurality of driving lugs are arranged on the inner side of the top of the annular boss, an inner flange is arranged on the inner wall of the inner liner corresponding to the height of the driving lugs, a self-locking inclined surface is arranged on the inner wall of the inner liner corresponding to the position of the unlocking block, a channel is left between the driving lugs and the inner wall of the inner liner, a plurality of locking lugs are arranged on the bottom of the nut, the locking lugs are placed on the top of the annular boss and located between adjacent driving lugs, a gap is left between the driving lugs and the locking lugs, a channel is also left between the locking lugs and the inner wall of the inner liner, a jump spring is arranged in the channel, an outwardly protruding outer flange is arranged on the jump spring, the outer flange is abutted against the inner wall of the inner liner under the elastic action of the jump spring, a lock head is arranged at one end of the jump spring, the lock head is matched with the self-locking inclined surface on the outer side, and the lock head is matched with the unlocking block on the inner side, an inwardly protruding blocking part is also arranged on the jump spring, the blocking part is matched with the locking lugs, and unidirectional ratchet teeth are arranged on the outer side wall of the drill body.

[0004] The working process of the self-locking structure is as follows: when the drill bit or workpiece is not clamped, the resistance received by the nut is small, the lock head of the jump spring is accommodated in the channel between the self-locking inclined surface and the unlocking block, the long sleeve is rotated to drive the nut to rotate by cooperation of the outer flange of the jump spring and the inner flange in the inner wall of the long sleeve, after the long sleeve is rotated to clamp the drill bit or workpiece, the resistance received by the nut is increased, at this time, the jump spring and the inner wall of the inner liner slide relative to each other, the outer flange slides from one side of the inner flange to the other side, at this time, the lock head is separated from the unlocking block, the outer side of the lock head is matched with the self-locking inclined surface, and the end of the lock head is clamped on the one-way ratchet on the outer side of the drill body, at this time, the long sleeve is continuously rotated, the jump spring elastically collides with the one-way ratchet on the outer side of the drill body, a "clicking" locking sound is emitted, and the end of the lock head is clamped on the one-way ratchet, so that the self-locking effect of preventing reverse rotation is achieved. When the long sleeve is reversely rotated, the long sleeve is rotated relative to the nut, the unlocking block slides relative to the jump spring, and the lock head of the jump spring is lifted, so that the lock head is separated from the one-way ratchet, at this time, the long sleeve is continuously rotated, the driving protrusion is matched with the locking protrusion to drive the nut to be reversely rotated, and the drill bit or workpiece can be easily unlocked and released.

[0005] Although the above locking structure is convenient to assemble and high in reliability, the following problems still exist: in the process of emitting the "clicking" locking sound during the locking operation, the vibration amplitude of the jump spring is small due to the extrusion limitation of the inner wall of the inner liner on the outer flange of the jump spring, so that the volume of the prompt sound during locking is not loud enough; and in the rotating process, the outer flange of the jump spring is always pressed on the inner wall of the inner liner, the inner liner is generally a plastic part and has a relatively small thickness at this position, and is easily extruded and deformed, thereby affecting the service life of the drill chuck. The utility model discloses a hand-tight drill chuck, and aims at improving the locking prompt sound of the drill chuck and prolonging the service life.

[0006] The utility model discloses a hand-tight drill chuck, and aims at improving the locking prompt sound of the drill chuck and prolonging the service life.

[0007] The utility model discloses a hand-tight drill chuck, and aims at improving the locking prompt sound of the drill chuck and prolonging the service life.

[0008] The utility model discloses a hand tight drill chuck which is improved on the basis of the structure of the existing drill chuck, i.e. the groove on the existing inner liner for accommodating the outer flange of the spring when in the locked state is changed into a through hole, so as to improve the locking prompt sound of the drill chuck and the service life. Specifically, the utility model is characterized in that a through hole is arranged on the inner wall of the inner liner on the other side of the limiting protrusion and extends from the inner wall to the outer wall in the radial direction. When the drill chuck is locked, the inner liner is rotated by the operator, and the resistance on the nut increases as the workpiece is tightened. Since one end of the spring is hooked or fixed to the nut, the inner liner and the spring will slip and rotate relative to each other when the driving force provided by the spring for the nut is less than the locking force required for the rotation of the nut. As the inner liner continues to rotate, the outer flange can slide out of the limiting groove and into the through hole along the limiting protrusion. The other end of the spring is elastically deformed under the extrusion of the inner liner and is clamped to the one-way ratchet. Since the through hole is a through hole, the outer flange in the through hole is not extruded by the inner wall of the inner liner. In this way, the inner wall of the inner liner is prevented from being deformed during rotation due to the extrusion of the outer flange, and the service life is improved. On the other hand, the outer flange is not extruded, so that the elastic deformation range of the spring that cooperates with the one-way ratchet on the drill body is increased. As a result, the elastic collision sound between the spring and the one-way ratchet during locking is louder, and the locking prompt sound of the drill chuck is improved. Meanwhile, the through hole is not a notch on the inner wall of the inner liner. In this way, the structural strength of the inner wall of the inner liner itself is good, and the inner liner is not easy to deform during production and assembly, and the service life is better. Therefore, the through hole improves the locking prompt sound of the drill chuck and the service life of the drill chuck.

[0009] In the hand tight drill chuck, the inner liner has an annular inner bottom surface, each limiting protrusion has an arc-shaped shielding part on the other side of the inner wall of the inner liner, the shielding part is above the inner bottom surface, and the through hole is between the shielding part and the inner bottom surface. The shielding part above the through hole can strengthen the structural strength of the position where the through hole is arranged, so that the inner wall of the inner liner at this position is not easy to deform, and the design of the through hole can improve the locking prompt sound of the drill chuck and the service life of the drill chuck.

[0010] In the hand tight drill chuck, the through hole is square, and the height of the through hole in the vertical direction is less than one half of the height of the extension wall of the inner liner extending upward from the inner bottom surface. The structural strength of the inner wall of the inner liner at the position of the through hole is ensured, so that the inner wall of the inner liner at this position is not easy to deform, and the design of the through hole can improve the locking prompt sound of the drill chuck and the service life of the drill chuck.

[0011] In the hand-tight drill chuck, the through hole is square, and the width of the through hole in the circumferential direction is greater than the maximum width of the outer flange in the circumferential direction. When the drill chuck is in the clamping state and the outer flange has entered the through hole, with the relative rotation of the inner liner and the jump spring, the above design enables the jump spring to also rotate a small section and emit a section of locking prompt sound, so that the operator can hear more clearly, thereby avoiding the operator from over-tightening operation to cause the drill chuck to be damaged, and thereby facilitating the improvement of the service life of the drill chuck.

[0012] In the hand-tight drill chuck, the inner wall of the other side of the limiting protrusion of the inner liner is provided with a vertical arrangement of a giving recess adjacent to it, and the through hole is arranged in the giving recess. Through the design of the giving recess, the jump spring is convenient to take out from the inner liner, thereby facilitating the disassembly and maintenance of the drill chuck.

[0013] In the hand-tight drill chuck, the surface of the limiting protrusion close to the lower end has a bevel one, a transition surface, a bevel two and a fold surface connected in sequence, the limiting protrusion and the groove bottom surface of the limiting recess are transitioned through the bevel one, and the limiting protrusion and the hole wall of the through hole are transitioned through the fold surface. Through the surface design of the limiting protrusion, the outer flange can smoothly slide into the through hole from the limiting recess, thereby avoiding excessive jamming of the outer flange with the inner liner during rotation, and thereby avoiding the extrusion deformation of the inner liner during the rotation of the outer flange, thereby facilitating the improvement of the service life of the drill chuck.

[0014] In the hand-tight drill chuck, the upper end of the limiting recess is through and has an inclined flared surface on the groove bottom close to the upper end. Through the above design, the jump spring is convenient to take out from the inner liner, thereby facilitating the disassembly of the drill chuck.

[0015] Compared with the prior art, the hand-tight drill chuck has the following advantages: the drill chuck is improved by the design of the through hole on the inner liner, which not only has a simple structure and reasonable design, but also greatly improves the locking prompt sound and service life of the drill chuck. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 is the axial sectional view of the hand-tight drill chuck.

[0017] Figure 2 is the radial sectional view of the jump spring of the hand-tight drill chuck when it is loosened.

[0018] Figure 3 is the radial sectional view of the jump spring of the hand-tight drill chuck after it is clamped.

[0019] Figure 4 is the three-dimensional structure schematic diagram of the inner liner of the hand-tight drill chuck.

[0020] In the diagram, 1. Drill body; 2. Nut; 3. Liner; 41. Limiting protrusion; 311. Inclined surface one; 312. Transition surface; 313. Inclined surface two; 314. Folded surface; 32. Limiting groove; 321. Flared surface; 33. Through hole; 34. Blocking part; 35. Relief groove; 3a. Inner bottom surface; 3b. Self-locking inclined surface; 4. Jumping spring; 41. Outer flange; 5. Clamping jaw; 6. Outer shell. Detailed Implementation

[0021] 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.

[0022] Specifically, such as Figure 1 As shown, this hand-operated drill chuck includes a drill body 1 with a one-way ratchet 1a, a nut 2, an inner liner 3, a spring 4, a jaw 5, and an outer shell 6. The nut 2 and the inner liner 3 are respectively fitted over the drill body 1. The outer shell 6 is fitted over the inner liner 3 and is fixedly connected to the inner liner 3. The spring 4 is located inside the inner liner 3 and between the nut 2 and the inner liner 3. One end of the spring 4 is hooked to or fixed to the nut 2, and the other end of the spring 4 can be engaged with the one-way ratchet 1a. The jaw 5 passes through the drill body 1 and is threadedly connected to the nut 2. The inner wall of the inner liner 3 has several inwardly protruding parts. A limiting protrusion 31 is provided. A limiting groove 32 is provided adjacent to the inner wall of the inner liner 3 on one side of the limiting protrusion 31. The spring 4 has an outer flange 41 that corresponds to the limiting groove 32. A through hole 33 is provided adjacent to the inner wall of the inner liner 3 on the other side of the limiting protrusion 31. The through hole 33 extends radially from the inner wall of the inner liner 3 to the outer wall. The through hole 33 is used to accommodate the outer flange 41 when the drill chuck is locked. When the inner liner 3 and the spring 4 rotate relative to each other, the outer flange 41 can slide out from the limiting groove 32 and slide along the limiting protrusion 31 into the through hole 33.

[0023] More specifically, such as Figure 4As shown, the through hole 33 is square. Adjacent to each other on the inner wall of the lining 3 on the other side of the limiting protrusion 31 are vertically arranged clearance grooves 35, and the through hole 33 is formed within these clearance grooves 35. The upper end of the limiting groove 32 is through-hole, and the bottom of the groove near the upper end has an inclined flared surface 321. The lining 3 has an annular inner bottom surface 3a. On the inner wall of the lining 3 on the other side of each limiting protrusion 31, there is an arc-shaped blocking portion 34, located above the inner bottom surface 3a. The through hole 33 is located between the blocking portion 34 and the inner bottom surface 3a. The vertical height of the through hole 33 is less than half the height of the lining 3 extending upwards from the inner bottom surface 3a. The circumferential width of the through hole 33 is greater than the maximum circumferential width of the outer flange 41. The surface of the limiting protrusion 31 near its lower end has a series of connected inclined surfaces 311, transition surface 312, inclined surface 313, and folded surface 314. The limiting protrusion 31 and the bottom surface of the limiting groove 32 are connected by inclined surface 311, and the limiting protrusion 31 and the wall of the through hole 33 are connected by folded surface 314.

[0024] The locking process of this hand-operated drill chuck is as follows: Initially, when jaw 5 is in the relaxed state, as follows: Figure 3 As shown, at this time, the outer flange 41 of the spring 4 is located in the limiting groove 32, and the other end of the spring 4 is not locked in the one-way ratchet 1a of the drill body 1. When the operator rotates the outer shell 6 by hand to make the inner liner 3 rotate, the inner liner 3 drives the spring 4, and the spring 4 drives the nut 2 to rotate, so that the jaw 5 slowly tightens. Until the inner liner 3 and the spring 4 slip and rotate relative to each other, continue to rotate the inner liner 3. As the inner liner 3 rotates, the outer flange 41 slides out from the limiting groove 32 and slides into the through hole 33 along the limiting protrusion 31. At the same time, the self-locking inclined surface 3b on the inner wall of the inner liner 3 squeezes the spring 4, so that the other end of the spring 4 is locked in the one-way ratchet 1a of the drill body 1. At this time, the drill bit is in a locked state. Figure 4 As shown; continue to rotate the inner liner 3, at this time the spring 4 and the one-way ratchet 1a will make a clicking locking sound when they collide elastically.

[0025] 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.

[0026] Although the terms of drill body 1, nut 2, inner liner 3, limiting protrusion 31, bevel one 311, transition surface 312, bevel two 313, folded surface 314, limiting recess 32, flared surface 321, through hole 33, shielding part 34, let recess 35, inner bottom surface 3a, self-locking bevel 3b, spring 4, outer flange 41, clamping jaw 5, outer shell 6 are used more in this article, but the possibility of using other terms is not excluded. Using these terms is only to facilitate the description and explanation of the essence of the utility model; interpreting them as any kind of additional limitation is contrary to the spirit of the utility model.

Claims

1. A hand-tight drill chuck, comprising a drill body (1) with a one-way ratchet (1a), a nut (2), an inner liner (3) and a jump spring (4), the nut (2) and the inner liner (3) being respectively sleeved outside the drill body (1), the jump spring (4) being arranged in the inner liner (3) and between the nut (2) and the inner liner (3), one end of the jump spring (4) being hooked or fixed on the nut (2), the other end of the jump spring (4) being capable of being clamped on the one-way ratchet (1a); a plurality of inwardly protruding limiting protrusions (31) are arranged on the inner wall of the inner liner (3), a limiting groove (32) being arranged adjacent to one side of the limiting protrusions (31) on the inner wall of the inner liner (3), the jump spring (4) having an outer flange (41) corresponding to the limiting groove (32), characterized in that, A through hole (33) is arranged adjacent to the inner wall of the inner liner (3) on the other side of the limiting protrusion (31), the through hole (33) penetrates the inner wall to the outer wall of the inner liner (3) in the radial direction, and rotating the inner liner (3) can make the outer flange (41) slide out of the limiting groove (32) and into the through hole (33) along the limiting protrusion (31).

2. The collet chuck according to claim 1, wherein The inner liner (3) has an annular inner bottom surface (3a) inside, and each limiting protrusion (31) has an arc-shaped shielding portion (34) on the inner wall of the inner liner (3) on the other side, the shielding portion (34) is located above the inner bottom surface (3a), and the through hole (33) is located between the shielding portion (34) and the inner bottom surface (3a).

3. The collet chuck according to claim 2, wherein The through hole (33) is square, and the height of the through hole (33) in the vertical direction is less than half of the height of the liner wall of the inner liner (3) extending upward from the inner bottom surface (3a).

4. The drill chuck as set forth in claim 1 or 2 or 3, wherein The through hole (33) is square, and the width of the through hole (33) in the circumferential direction is greater than the maximum width of the outer flange (41) in the circumferential direction.

5. The drill chuck as set forth in claim 1 or 2 or 3, wherein The inner wall of the inner liner (3) on the other side of the limiting protrusion (31) is adjacent to a vertical arrangement of a giving recess (35), and the through hole (33) is arranged in the giving recess (35).

6. The drill chuck of claim 1 or 2 or 3, wherein, The surface of the limiting protrusion (31) close to the lower end has a bevel one (311), a transition surface (312), a bevel two (313), and a fold surface (314) connected in sequence, the limiting protrusion (31) and the groove bottom surface of the limiting groove (32) are connected through the bevel one (311), and the limiting protrusion (31) and the hole wall of the through hole (33) are connected through the fold surface (314).

7. The drill chuck of claim 1 or 2 or 3, wherein, The upper end of the limiting groove (32) has an inclined flared surface (321) on the groove bottom.

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