A hand drill chuck

Abstract

The utility model provides a hand tight drill chuck belongs to hand tight drill chuck technical field. It solved the technical problem of more components of the existing hand tight drill chuck while ensuring excellent locking effect. The hand tight drill chuck includes drill body, bearing ring, nut, jump spring and outer cover, bearing ring and nut are in turn set in the periphery of drill body, the outside of jump spring has the locating pawl, the inner wall of outer cover has the clamping groove, jump spring can abut against nut and rotate synchronously, the lower edge of jump spring has the turn over edge that can be clamped between the lower side of bearing ring and drill body when the nut is screwed, the periphery of nut has the ratchet, jump spring has the elastic lock piece that can deform to the inside and lock in the unscrewing direction unidirectionally with ratchet when the outer cover relatively the turn over edge that is clamped continues to screw, the upper portion between outer cover and nut has the keyway structure that can make outer cover drive nut rotate in the screwing direction when elastic lock piece and ratchet lock unidirectionally. The utility model still effectively guarantees excellent clamping effect under the condition of fewer components.

Description

Technical Field

[0001] This utility model belongs to the technical field of hand-tightening drill chucks and relates to a hand-tightening drill chuck. Background Technology

[0002] A drill chuck consists of a drill body, jaws, a nut, bearings, an outer sleeve, a front cover, and a rear cover. Rotating the nut causes the jaws to move forward or backward, thus clamping or releasing the drill bit. When a standard drill chuck is used with an impact drill, the significant vibrations can cause the nut to rotate in the loosening direction, resulting in the tool falling out and preventing the chuck from performing its normal clamping operation.

[0003] To this end, patent application number CN202321569132.7 discloses a hand-tightening drill chuck with a locking structure, including a drill body, ratchet teeth fixed relative to the drill body, pawls, a nut, and an outer sleeve. The outer sleeve is fitted around the outer periphery of the drill body, and the nut is located between the drill body and the outer sleeve. The outer sleeve is provided with a locking pawl position in a loose state, a locking pawl position in a locked state, an anti-loosening pawl position in a loose state, and an anti-loosening pawl position in a locked state. The hand-tightening drill chuck also includes a locking ring, which includes an anti-loosening pawl and a locking pawl. When the locking pawl is in the locking pawl position, the locking pawl engages with the ratchet teeth. The locking ring is fitted around the outer periphery of the nut and connected to the rear end of the nut. The locking ring can rotate circumferentially synchronously with the nut.

[0004] The aforementioned hand-tightening drill chuck can effectively maintain the clamping and securing effect, but it still has shortcomings: it has a large number of components, but the locking ring locks with the ratchet positioned circumferentially on the drill body when locking to achieve the securing and anti-loosening effect. For this function, all components must play their role and none can be missing. Summary of the Invention

[0005] This utility model addresses the aforementioned problems in existing technologies by providing a hand-tightening drill chuck. The technical problem this utility model aims to solve is that while existing hand-tightening drill chucks can guarantee a locking effect, they have a large number of components.

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

[0007] A hand-tightening drill chuck includes a drill body, a bearing ring, a nut, a spring, an inner liner, and an outer sleeve. The bearing ring and nut are annular and sequentially fitted around the drill body. The spring is annular with outwardly arched positioning claws on its outer side. The inner wall of the inner liner has several locking grooves for positioning the positioning claws so that the outer sleeve can drive the spring to rotate synchronously. The outer sleeve is fixedly fitted around the outer periphery of the inner liner. The key feature is that the spring can abut against and rotate synchronously with the nut along the tightening direction, and the lower edge of the spring has a locking mechanism for the nut to rotate. When tightened, the flange can be clamped between the lower side of the bearing ring and the drill body. The outer periphery of the nut has ratchet teeth arranged circumferentially. The spring has an elastic locking piece that can deform inward and lock unidirectionally with the ratchet teeth in the loosening direction when the inner liner is tightened relative to the clamped flange. When the elastic locking piece is unidirectionally locked with the ratchet teeth, the positioning claw is positioned in another locking groove. There is a keyway structure between the inner liner and the upper part of the nut, which can cause the inner liner to drive the nut to rotate in the tightening direction when the elastic locking piece is unidirectionally locked with the ratchet teeth.

[0008] The inner edge of the nut has threads to engage with the threads of the chucks inside the drill body to control the clamping and loosening of the chucks. The bearing ring reduces the frictional resistance encountered by the nut during rotation, ensuring smooth rotation. The positioning claw on the spring is positioned in the locking groove on the inner wall of the liner, allowing the liner to rotate synchronously with the spring. The spring can abut against the nut circumferentially, thereby causing the nut to rotate in the same direction and clamp the chucks. When clamped to a certain extent, the nut, facing downwards, presses the flange of the spring against the bearing ring, greatly increasing the frictional force of the spring relative to the drill body. When this frictional force exceeds the deformation force of the positioning claw, the liner will move relative to the spring, causing the elastic locking plate to move to the edge of the receiving groove and deform inwards under pressure, engaging with the ratchet teeth on the outer circumference of the nut in the loosening direction. The one-way locking mechanism prevents the nut from loosening in the opposite direction, thus preventing the clamping jaws from disengaging. The anti-loosening jaws slide into another locking groove to form a position, preventing accidental unlocking due to vibration causing the elastic locking plate and ratchet to disengage. At the same time, the inner liner, through the keyway structure, allows the nut to continue to rotate slightly and tighten as the inner liner continues to tighten. The ratchet on the nut can move relative to the elastic locking plate on the spring, producing a clicking sound to ensure the locked state and to indicate to the user that it has been locked to the final stage, thereby ensuring locking stability. This hand-tightening drill chuck omits the ratchet component that is circumferentially fixed to the drill body. Instead, by setting ratchet on the outer circumference of the nut and setting different engagement and activity states of the spring at different locking stages, it still ensures a stable clamping function with fewer components.

[0009] In the aforementioned hand-tightening drill chuck, the outer periphery of the nut has a radially outwardly protruding limiting block, and the upper edge of the spring has an upwardly facing arc plate. The side of the arc plate abuts against the limiting block along the tightening direction of the outer sleeve. The arc plate and the protruding limiting block can maintain stable contact, and when the inner liner drives the spring to rotate, it can drive the nut to tighten synchronously.

[0010] In the aforementioned hand-operated drill chuck, the spring is a closed ring, and there are several arc plates arranged circumferentially around the drill body. Each arc plate has a positioning claw and an elastic locking plate. This ensures uniform and stable circumferential strength of the spring, preventing deformation under stress that could affect the locking effect. Furthermore, the multiple arc plates with positioning claws and elastic locking plates guarantee stable and reliable torque load transmission between the spring, the inner liner, and the nut, thus ensuring locking stability.

[0011] In the aforementioned hand-tightening drill chuck, the inner wall of the liner also has a receiving groove. The elastic locking plate is strip-shaped with its outer end inclined inward. The elastic locking plate is located within the receiving groove. When the liner continues to tighten relative to the clamped flange, the elastic locking plate deforms inward along the inner wall of the receiving groove and locks unidirectionally with the ratchet. This ensures that the elastic locking plate remains within the receiving groove when the spring is not compressed, preventing premature inward contact with the ratchet and ensuring a reliable and stable locking process.

[0012] In the aforementioned hand-tightening drill chuck, the keyway structure includes a drive groove located above the nut and a drive block located on the inner wall of the liner. The drive block is located within the drive groove and spaced apart from the inner wall of the drive groove along the tightening direction. When the elastic locking plate locks with the ratchet, the drive block can rotate with the liner and drive the nut to rotate synchronously. Thus, in the initial state, the drive block does not contact the inner wall of the drive groove along the tightening direction, ensuring that the liner drives the nut to tighten via the spring. Only when the spring is compressed and the liner rotates a certain angle relative to the spring, causing the elastic locking plate to lock with the ratchet, will the drive block be able to directly push the inner wall of the drive groove, ensuring a stable tightening process.

[0013] In the aforementioned hand-tightening drill chuck, each of the aforementioned arc plates is integrally formed with several positioning claws, which are arranged vertically at intervals on the same arc plate. This arrangement of more positioning claws ensures that the positioning claws will only disengage from the locking grooves after the frictional resistance on the spring is sufficiently high. This prevents the elastic locking plate from locking with the ratchet teeth when the nut is just beginning to tighten, thus avoiding the user hearing a clicking sound prematurely and misjudging the tightening state. Furthermore, the vertically spaced positioning claws ensure a uniform vertical distribution of the elastic force, guaranteeing reliability.

[0014] In the aforementioned hand-tightening drill chuck, the width of the limiting block along the circumference of the nut is smaller than the minimum interval between two adjacent arc plates. This allows the limiting block to smoothly pass through the space between adjacent arc plates when the nut is assembled after the spring is fitted onto the drill body. This facilitates smooth assembly, and synchronous rotation completes the assembly process.

[0015] In the aforementioned hand-tightening drill chuck, the outer periphery of the drill body has an annular stepped surface. The flange is fitted onto the outer periphery of the drill body and supported on the stepped surface. The upper side of the flange is a conical surface with the smaller end facing downwards. The bearing ring is supported on the upper side of the flange. When the nut is tightened, it can press the bearing ring downwards and press the flange tightly onto the stepped surface. In this way, the flange is positioned by the drill body and directly supported by the stepped surface, so that when the nut is tightened, the load can be transferred to the flange through the bearing ring, so that it can be pressed tightly onto the stepped surface and lock the spring. At the same time, when the bearing ring is pressed against the upper side of the flange, it will be subjected to an inward centripetal force, which helps to keep the bearing ring coaxial with the drill body when it is pressed down. At the same time, the flange is subjected to downward pressure and radial outward force, ensuring a concentric effect.

[0016] In the aforementioned hand-operated drill chuck, both the locking groove and the receiving groove are downward-facing through-holes. This allows the positioning claw and the elastic locking piece to enter the locking groove and receiving groove from below during assembly, ensuring ease of assembly.

[0017] In the aforementioned hand-tightening drill chuck, the outer end of the elastic locking plate faces the same direction as the tightening of the outer sleeve. This ensures that when the final inner liner drive block continues to tighten the nut, the ratchet can move relative to the elastic locking plate, causing the outer end of the elastic locking plate to bounce along the ratchet teeth one by one.

[0018] In the aforementioned hand-operated drill chuck, the flange positioning sleeve is fitted around the outer periphery of the drill body. This helps ensure the concentricity between the flange and the drill body, allowing the positioning claws and elastic locking plates on the entire spring to act evenly and stably, ensuring a stable and reliable locking process.

[0019] In the aforementioned hand-operated drill chuck, the ratchet teeth extend upwards to the upper end of the nut. This facilitates the alignment of the outer circumferential surface during the machining of the ratchet teeth on the ring nut, reducing the difficulty and cost of the process.

[0020] In the aforementioned hand-tightening drill chuck, the inner liner is supported on the upper end of the nut, and the positioning claws and elastic locking plates face upwards and are spaced apart from the inner wall of the locking groove. This allows the inner liner to be axially positioned by the nut, preventing interference friction between the elastic positioning claws and elastic locking plates and the locking groove, thus ensuring smooth and stable deformation during tightening and guaranteeing reliable tightening.

[0021] In the aforementioned hand-operated drill chuck, the drive block is spaced apart from the bottom surface of the drive groove. This helps reduce the frictional resistance experienced by the drive block when rotating relative to the nut, resulting in a smooth and stable clamping operation.

[0022] Compared with the prior art, the advantages of this utility model are as follows:

[0023] Compared to existing products, this hand-operated drill chuck omits the ratchet component. Through a special design of the spring and nut, it achieves the same clamping performance with a more streamlined structure. Attached Figure Description

[0024] Figure 1 This is a three-dimensional structural diagram of this embodiment.

[0025] Figure 2 This is a three-dimensional structural diagram of the drill body, bearing ring, nut, and spring assembly in this embodiment.

[0026] Figure 3 This is a three-dimensional exploded structural diagram of the drill body, bearing ring, nut, and spring assembly in this embodiment.

[0027] Figure 4 This is a three-dimensional structural diagram of the outer casing in this embodiment.

[0028] Figure 5 This is a front view structural diagram of this embodiment.

[0029] Figure 6 yes Figure 5 A schematic diagram of the AA cross section.

[0030] Figure 7 yes Figure 6 Enlarged view of part D in the image.

[0031] Figure 8 yes Figure 5 A schematic diagram of the BB cross-section.

[0032] Figure 9 yes Figure 5 A schematic diagram of the CC cross-section.

[0033] Figure 10 yes Figure 8 A schematic diagram of the cross-sectional structure in the locked state.

[0034] In the diagram, 1. Drill body; 11. Stepped surface; 2. Bearing ring; 3. Nut; 31. Ratchet; 32. Limiting block; 33. Drive groove; 4. Jumping spring; 41. Positioning claw; 42. Elastic locking plate; 43. Arc plate; 44. Flanged edge; 5. Inner liner; 51. Locking groove; 52. Drive block; 53. Receiving groove; 6. Clamping claw; 7. Keyway structure; 8. Outer sleeve. Detailed Implementation

[0035] 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.

[0036] like Figure 1As shown, this hand-operated drill chuck includes a drill body 1, an outer sleeve 8, and three strip-shaped jaws 6. The three jaws 6 are inserted inside the drill body 1, and the sleeve-shaped outer sleeve 8 is fitted around the drill body 1.

[0037] like Figure 2 , Figure 3 As shown, the hand-tightening drill chuck also includes a bearing ring 2, a nut 3, and a spring 4. The bearing ring 2 and the nut 3 are annular and are sequentially sleeved around the drill body 1. The spring 4 is annular and has an outwardly arched positioning claw 41 and an outwardly arched elastic locking piece 42 with its end inclined inward. The shapes of the positioning claw 41 and the elastic locking piece 42 can refer to the prior art. The outer periphery of the nut 3 has circumferentially arranged ratchet teeth 31 and radially outwardly protruding limiting blocks 32. The ratchet teeth 31 extend upward to the upper end of the nut 3. The upper end of the nut 3 has several circumferentially spaced drive grooves 33. The lower edge of the spring 4 has an inwardly bent flange 44, making the cross-section of the spring 4 L-shaped. The outer periphery of the drill body 1 has an annular stepped surface 11. The spring 4 abuts against the limiting block 32 along the tightening direction of the outer sleeve 8. Specifically, the spring 4 is a closed ring. Three circumferentially spaced arc plates 43 are integrally formed along the upper edge of the spring 4. The sides of the arc plates 43 abut against the limiting block 32 along the tightening direction of the outer sleeve 8. Each arc plate 43 has a positioning claw 41 and an elastic locking piece 42. Two positioning claws 41 are integrally formed on each arc plate 43, and the two positioning claws 41 on the same arc plate 43 are arranged vertically at intervals. The horizontal width of the limiting block 32 is smaller than the interval between two adjacent arc plates 43.

[0038] like Figure 4 As shown, the hand-tightening drill chuck also includes an inner liner 5, and an outer sleeve 8 is fixedly fitted around the outer periphery of the inner liner 5. The inner wall of the inner liner 5 has multiple slots 51 for positioning the positioning claw 41 and slots 53 for accommodating the elastic locking piece 42. The slots 51 are downwardly through so that the positioning claw 41 and the elastic locking piece 42 can be inserted from below to achieve combination. The inner wall of the inner liner 5 also has four drive blocks 52 evenly spaced around the circumference.

[0039] like Figure 5-7 As shown, the flange 44 is fitted around the outer periphery of the drill body 1 and supported on the stepped surface 11. The upper side of the flange 44 is a conical surface with the small end facing downwards. The bearing ring 2 is supported on the upper side of the flange 44. When the nut 3 is tightened, it can press the bearing ring 2 downwards and press the flange 44 onto the stepped surface 11. The inner liner 5 is supported on the upper end of the nut 3, and the positioning claw 41 and the elastic locking piece 42 face upwards and are spaced apart from the inner wall of the locking groove 51. The driving block 52 is located in the driving groove 33, and the driving block 52 is spaced apart from the bottom surface of the driving groove 33.

[0040] like Figure 8 , Figure 9As shown, the inner liner 5 can drive the spring 4 to rotate synchronously through the engagement relationship between the locking groove 51 and the positioning claw 41. Specifically, there are three sets of locking grooves 51 and receiving grooves 53. Each set includes four locking grooves 51 and one receiving groove 53. The four locking grooves 51 are used to position the two positioning claws 41 in the relaxed state and the locked state, respectively. When the receiving groove 52 is locked, the elastic locking piece 42 can move to the edge of the locking groove 51 and deform inward under force. The orientation of the outer end of the elastic locking piece 42 is consistent with the tightening direction of the outer sleeve 8. The driving block 52 and the driving groove 33 form a keyway structure 7 that can be locked by the inner liner 5 driving the nut 3 to rotate synchronously. When the elastic locking piece 42 deforms inward and locks with the ratchet 31, the driving block 52 can approach and abut against the inner wall of the driving groove 33 along the tightening direction of the outer sleeve 8.

[0041] As the drill bit is gradually clamped, the inner liner 5 rotates, causing the spring 4 to rotate synchronously. The spring 4, in turn, drives the nut 3 to rotate in the same direction via the limit block 32, causing the jaws 6 to clamp. When the clamping reaches a certain degree, the nut 3, facing downwards, presses the flange 44 against the bearing ring 2, thus greatly increasing the frictional force of the spring 4 relative to the drill body 1. When this frictional force exceeds the elastic force of the positioning jaws 41, such as... Figure 10 As shown, the inner liner 5 moves relative to the spring 4, causing the elastic locking plate 42 to move along the inner wall of the receiving groove 53 to its edge, where it is compressed and deformed inward. It then locks the ratchet 31 on the outer periphery of the nut 3 in one direction along the loosening direction, thus preventing the nut 3 from rotating in the opposite direction and causing the gripper 6 to loosen. At the same time, the driving block 52 on the inner wall of the inner liner 5 moves relative to the spring 4 and gradually approaches the inner wall of the driving groove 33, forming abutment. When the outer sleeve 8 continues to tighten, it can directly drive the nut 3 to continue to rotate slightly and tighten, and make the limiting block 32 and the spring 4 circumferentially spaced. The ratchet 31 on the nut 3 moves synchronously relative to the elastic locking plate 42 on the spring 4, making a clicking sound to ensure the locking state and to indicate to the user that it has been locked to the final stage, thus ensuring the stability of the lock. When unlocking is required, the user controls the outer sleeve 8 to rotate in the opposite direction. Since the spring 4 is pressed and locked, the inner liner 5 can reverse relative to the spring 4, causing the elastic locking plate 42 to return to the corresponding locking groove 51 to achieve unlocking, which can be smoothly loosened. This hand-operated drill chuck cleverly achieves a stable clamping and securing effect through a more streamlined structure, unlike the concept in the field that simply sets up separate parts as a single structure.

[0042] 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 replace them, without departing from the spirit of this utility model or exceeding the scope defined by the appended claims.

Claims

1. A hand-tightening drill chuck, comprising a drill body (1), a bearing ring (2), a nut (3), a spring (4), an inner liner (5), and an outer liner (8), wherein the bearing ring (2) and the nut (3) are annular and sequentially fitted around the periphery of the drill body (1), the spring (4) is annular and has outwardly arched positioning claws (41) on its outer side, the inner wall of the inner liner (5) has several locking grooves (51) for positioning the positioning claws (41) so that the inner liner (5) can drive the spring (4) to rotate synchronously, and the outer liner (8) is fixedly fitted around the outer periphery of the inner liner (5), characterized in that, The spring (4) can abut against the nut (3) and rotate synchronously in the tightening direction. The lower edge of the spring (4) has a flange (44) that can clamp between the lower side of the bearing ring (2) and the drill body (1) when the nut (3) is tightened. The outer periphery of the nut (3) has ratchet teeth (31) arranged in a circumferential direction. The spring (4) has an elastic locking piece (42) that can deform inward and lock unidirectionally with the ratchet teeth (31) in the loosening direction when the inner liner (5) continues to tighten relative to the clamped flange (44). When the elastic locking piece (42) locks unidirectionally with the ratchet teeth (31), the positioning claw (41) is positioned in another locking groove (51). There is a keyway structure (7) between the inner liner (5) and the upper part of the nut (3) that can cause the inner liner (5) to drive the nut (3) to rotate in the tightening direction when the elastic locking piece (42) locks unidirectionally with the ratchet teeth (31).

2. The collet chuck according to claim 1, wherein The outer periphery of the nut (3) has a limiting block (32) that protrudes radially outward, and the upper edge of the spring (4) has an arc plate (43) that is set upward. The side of the arc plate (43) abuts against the limiting block (32) along the tightening direction of the outer sleeve (8).

3. The collet chuck according to claim 2, wherein The spring (4) is in the shape of a closed ring, and there are several arc plates (43) arranged at intervals around the drill body (1). Each arc plate (43) has the positioning claw (41) and the elastic locking plate (42).

4. The collet chuck according to claim 2, wherein The inner wall of the liner (5) also has a receiving groove (53). The elastic locking piece (42) is strip-shaped and inclined with its outer end facing inward. The elastic locking piece (42) is located in the receiving groove (53). When the liner (5) continues to tighten relative to the clamped flange (44), the elastic locking piece (42) deforms inward along the inner wall of the receiving groove (53) and locks in one direction with the ratchet (31).

5. The collet chuck according to claim 2, wherein The keyway structure (7) includes a drive groove (33) located on the upper part of the nut (3) and a drive block (52) located on the inner wall of the liner (5). The drive block (52) is located in the drive groove (33) and is spaced apart from the inner side wall of the drive groove (33) along the tightening direction. When the elastic locking piece (42) locks with the ratchet (31), the drive block (52) can rotate with the liner (5) and drive the nut (3) to rotate synchronously.

6. The collet chuck according to claim 2, wherein Each of the arc plates (43) has a number of positioning claws (41) integrally formed on it, and the number of positioning claws (41) on the same arc plate (43) are arranged vertically at intervals.

7. The collet chuck of claim 2 wherein, The width dimension of the limiting block (32) along the circumference of the nut (3) is smaller than the minimum interval dimension between two adjacent arc plates (43).

8. The drill chuck of claim 1 or 2 or 3 or 4, wherein, The outer periphery of the drill body (1) has an annular stepped surface (11). The flange is sleeved on the outer periphery of the drill body (1) and supported on the stepped surface (11). The upper side of the flange (44) is a cone-shaped surface with the small end facing down. The bearing ring (2) is supported on the upper side of the flange (44). When the nut (3) is tightened, it can squeeze the bearing ring (2) downward and press the flange (44) onto the stepped surface (11).

9. The drill chuck of claim 1 or 2 or 3 or 4, wherein, Both the slot (51) and the receiving slot (53) are downward-facing through.

10. The drill chuck of claim 1 or 2 or 3 or 4, wherein, The liner (5) is supported on the upper end of the nut (3), and the positioning claw (41) and the elastic locking piece (42) face upward and are spaced apart from the inner wall of the locking groove (51), and the driving block (52) is spaced apart from the bottom surface of the driving groove (33).

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