Wear-resistant self-locking drill chuck

Abstract

The utility model discloses a wear-resistant self-locking drill chuck, and belongs to the technical field of drill chucks. The technical problem of how to prolong the service life and improve the reliability is solved. According to the technical scheme, the drill is characterized by comprising a drill body, a clamping jaw, a nylon lining, a spring piece, a nut sleeve, a nut piece and a long sleeve, the nut piece is rotated to control the clamping jaw to move on the drill body, the nut sleeve is fixed on the periphery of the nut piece, the spring piece is matched in the nut sleeve, and the nut sleeve and the drill body are locked and limited through the spring piece; a sheet-shaped supporting foot is arranged at the lower end of the nut sleeve, a first limiting groove is formed in the nylon lining, the supporting foot penetrates through the first limiting groove, a first half tooth part is arranged at the lower end of the long sleeve, and a second half tooth part matched with the first half tooth part is arranged at the lower end of the nylon lining. A second limiting groove for the supporting feet to move is formed between the two first half tooth parts on the long sleeve, when the long sleeve is rotated, the supporting feet collide with the groove wall of the second limiting groove of the long sleeve, and the effect of prolonging the service life is achieved.

Description

Technical Field

[0001] This invention relates to the technical field of drill chucks, and more particularly to a wear-resistant self-locking drill chuck. Background Technology

[0002] Currently, in the structure of self-locking drill chucks, such as the structure disclosed in application number CN201811144207.0, a self-locking drill chuck is included, comprising a rotating sleeve, a drill body, a nut, a nut sleeve fixedly connected to the nut, jaws, and a self-locking structure. The self-locking structure includes teeth and a spring plate. The spring plate has a locking end that engages with the teeth and a connecting protrusion. The rotating sleeve has a first part that connects to the connecting protrusion of the spring plate in the self-locking state and a second part that connects to the connecting protrusion of the spring plate in the non-self-locking state, as well as a cam structure for controlling the locking end of the spring plate. The drill chuck is provided with a fixing structure or a limiting structure that engages with the spring plate at a position next to the connecting protrusion to fix it or limit it in the inward movement direction. The above structure can more reliably maintain the self-locking state during operation.

[0003] When operating the self-locking mechanism, the outer shell needs to be rotated. The outer shell drives the rotating sleeve, which in turn drives the nut sleeve. This structure relies on snap-fit ​​connections during assembly. The end of the nut sleeve has a plate-like snap-fit ​​structure. To ensure its structural strength and reliability, this structure is made of metal, making the plate-like structure quite sharp. The outer shell also has plate-like claw structures, which are also quite sharp. During rotation, they are not only prone to wear but also easy to break. Nowadays, the rotating sleeve is made of plastic to reduce weight. When the rotating sleeve encounters such a sharp assembly structure, it is easily worn and cut by the plate-like structure.

[0004] This results in a short structural lifespan and unreliable operation. Utility Model Content

[0005] To address the aforementioned technical problems and shortcomings—specifically, how to improve service life and reliability—this invention provides a wear-resistant self-locking drill chuck.

[0006] To achieve the above and other related objectives, the present invention adopts the following technical solution:

[0007] A wear-resistant self-locking drill chuck includes a drill body, jaws, a nylon liner, a spring plate, a nut sleeve, a nut component, and a long sleeve. The jaws are inserted into the drill body and threadedly engaged with the nut component. Rotating the nut component controls the movement of the jaws on the drill body. The nut sleeve is fixed on the outer periphery of the nut component. The spring plate is fitted inside the nut sleeve, and the spring plate locks and limits the nut sleeve and the drill body.

[0008] The lower end of the nut sleeve is provided with a plate-shaped support foot, and a first limiting groove is provided on the nylon liner. The support foot passes through the first limiting groove. The lower end of the long sleeve is provided with a first half tooth, and the lower end of the nylon liner is provided with a second half tooth that matches the half tooth. A second limiting groove is formed between the two first half teeth on the long sleeve for the support foot to move. When the long sleeve is rotated, the support foot strikes the groove wall of the second limiting groove of the long sleeve.

[0009] Preferably, the second limiting groove is directly opposite the first limiting groove, and the length of the second limiting groove for the support leg to move is less than or equal to the length of the first limiting groove.

[0010] Preferably, the long sleeve is made of stainless steel, and the hardness of the long sleeve is greater than the hardness of the support leg, which in turn is greater than the hardness of the nylon lining.

[0011] Preferably, a decorative cap is fitted onto the inner liner, and a retaining spring is engaged at the lower end of the drill body. The retaining spring limits the lower end of the decorative cap and prevents the decorative cap from detaching.

[0012] Preferably, a bearing is installed at the upper end of the nut, the bearing is limited by a washer, and a tail cap is installed at the upper end of the long sleeve.

[0013] Preferably, the lower end of the nut sleeve is provided with two symmetrical and arc-shaped support legs in its circumferential direction, and both the first limiting groove and the second limiting groove are arc-shaped.

[0014] Preferably, the first half-tooth portion on the long sleeve is arranged in its circumferential direction, and two first half-tooth portions are arranged symmetrically, and the second half-tooth portion on the nylon liner is complementary to the first half-tooth portion.

[0015] In summary, the present invention provides at least one of the following beneficial technical effects:

[0016] 1. Whether controlling the gripper or locking the nut, the long sleeve is used for control. Rotating the long sleeve clockwise causes the nut sleeve to rotate, which in turn rotates the nut. The nut then drives the gripper to clamp the screwdriver bit. To ensure a tight clamping action, the long sleeve can be rotated further after tightening, causing the nut sleeve to compress the spring plate, locking it onto the drill body. To unlock, simply rotate the long sleeve in the opposite direction, and the spring plate will return to its original position. During this process, because the nylon liner is prone to wear and breakage when in contact with metal, a first limiting groove is created in the nylon liner, allowing the nut sleeve's support to protrude. The long sleeve can then directly impact or push the support leg to rotate the nut sleeve. This prevents the nut sleeve from contacting the nylon liner during rotation, thus improving its lifespan.

[0017] 2. To avoid wear and tear on the inner lining caused by the outriggers, the second limiting groove is designed to be larger. This not only makes it easier for the outriggers to pass through but also prevents them from touching each other, allowing the long sleeve to drive and push the outriggers.

[0018] 3. In order to maintain structural strength and reliability, the long sleeve is on the outermost side and plays a role in isolation and protection, so it needs to be made of metal. Therefore, stainless steel is used to improve wear resistance.

[0019] 4. The decorative cap and tail cap can block dust and foreign objects, further extending the service life. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the assembly structure of an embodiment of the present invention;

[0021] Figure 2 This is a schematic diagram of the working state of the spring sheet according to an embodiment of the present invention;

[0022] Figure 3 This is a schematic diagram of the drill body according to an embodiment of the present invention;

[0023] Figure 4 This is a bottom view of the nylon lining;

[0024] Figure 5 This is a side half-section diagram of the nylon lining;

[0025] Figure 6 This is a top view of the nylon lining;

[0026] Figure 7 This is a bottom view of the nut sleeve;

[0027] Figure 8 This is a half-sectional view of the nut sleeve;

[0028] Figure 9 It is a long, bottom-view image.

[0029] Explanation of reference numerals for major components:

[0030] 1. Drill body; 101. Inclined hole; 102. Clamping tooth; 2. Snap ring; 3. Decorative cap; 4. Clamping jaw; 5. Nylon liner; 501. First limiting groove; 502. Second half tooth; 6. Spring plate; 7. Nut sleeve; 701. Support leg; 8. Nut component; 9. Bearing; 10. Washer; 11. Long sleeve; 111. First half tooth; 112. Second limiting groove; 12. Tail cap. Detailed Implementation

[0031] The following specific examples illustrate the implementation of this invention. Those skilled in the art can easily understand other advantages and effects of this invention from the content disclosed in this specification. This invention can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of this invention. It should be noted that, unless otherwise specified, the following embodiments and features can be combined with each other.

[0032] It should be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of the present invention. The illustrations only show the components related to the present invention and are not drawn according to the number, shape and size of the components in actual implementation. In actual implementation, the form, quantity and proportion of each component can be changed at will, and the layout of the components may also be more complex.

[0033] The specific embodiments of the present invention will be further described below with reference to the accompanying drawings.

[0034] Example:

[0035] This invention discloses a wear-resistant self-locking drill chuck, as per an embodiment. Figure 1 As shown, the system includes a drill body 1, grippers 4, a nylon liner 5, a spring plate 6, a nut sleeve 7, a nut piece 8, and a long sleeve 11. The grippers 4 are inserted into the drill body 1 and threadedly engaged with the nut piece 8. Rotating the nut piece 8 controls the movement of the grippers 4 on the drill body 1. The nut sleeve 7 is fixed on the outer periphery of the nut piece 8. The spring plate 6 is fitted inside the nut sleeve 7, and the spring plate 6 locks and limits the nut sleeve 7 and the drill body 1.

[0036] Specifically, the structure of drill body 1 can be further combined Figure 3 Understandably, the drill body 1 has three inclined holes 101, evenly distributed circumferentially around its perimeter. The gripper 4 passes through the inclined holes 101 and has threads. By cooperating with the nut 8, rotating the nut 8 allows the gripper 4 to clamp and loosen. This operation is consistent with existing structures. The drill body 1 has locking teeth 102, which are used to secure the spring plate 6. Figure 1 As can be seen, the installation space of the spring plate 6 is located between the retaining tooth 102 and the nut sleeve 7. The nut sleeve 7 has a groove for the spring plate 6 to be engaged. The structure of the spring plate 6 is shown in the reference. Figure 2As shown, the protruding part of the spring plate 6 is used to engage with the nut sleeve 7. Although the nut sleeve 7 engages the spring plate 6, the spring plate 6 has free movement space. The spring plate 6 can switch from a free state to a locked state when the nut sleeve 7 rotates. In the locked state, the nut sleeve 7 pushes the spring plate 6, causing the spring plate 6 to tighten and engage with the retaining tooth 102 of the drill body 1, thus locking the nut sleeve 7 and preventing it from rotating further. It can only be unlocked by rotating the nut sleeve 7 in the opposite direction.

[0037] Reference for nut sleeve 7 Figure 7 and Figure 8 As shown, its assembly position is referenced. Figure 1 As shown. The nut sleeve 7 is made of metal, and the support legs 701 are relatively sharp. The lower end of the nut sleeve 7 has two symmetrical and arc-shaped support legs 701 in its circumferential direction. The first limiting groove 501 and the second limiting groove 112 are both arc-shaped.

[0038] The nylon lining 5 is made of nylon, which helps reduce weight. (Reference) Figure 4 , Figure 5 and Figure 6 To understand its structure, you can refer to its assembly location. Figure 1 As shown, the nylon liner 5 and the long sleeve 11 are fitted together. Specifically, the first half-tooth portion 111 on the long sleeve 11 is arranged in its circumferential direction, and there are two symmetrical first half-tooth portions 111. The second half-tooth portion 502 on the nylon liner 5 is complementary to the first half-tooth portion 111. This fitting method achieves reliable synchronous drive, that is, the nylon liner 5 rotates by the same amount as the long sleeve 11.

[0039] The lower end of the nut sleeve 7 is provided with a plate-shaped support leg 701. The nylon liner 5 is provided with a first limiting groove 501. The support leg 701 passes through the first limiting groove 501. The lower end of the long sleeve 11 is provided with a first half tooth 111. The lower end of the nylon liner 5 is provided with a second half tooth 502 that matches the half tooth.

[0040] Long set 11 reference Figure 9 As shown, the installation location is combined with Figure 1 As shown, a second limiting groove 112 is formed between the two first half teeth 111 on the long sleeve 11 for the support leg 701 to move. When the long sleeve 11 is rotated, the support leg 701 hits the groove wall of the second limiting groove 112 of the long sleeve 11.

[0041] The second limiting groove 112 is directly opposite the first limiting groove 501. The length of the second limiting groove 112 for the support leg 701 to move is less than or equal to the length of the first limiting groove 501. The long sleeve 11 is made of stainless steel, and its hardness is greater than that of the support leg 701, which is greater than that of the nylon liner 5. To avoid wear on the liner by the support leg 701, the second limiting groove 112 is designed to be larger. This not only makes it easier for the support leg 701 to pass through but also prevents the support leg 701 from touching the liner, allowing the long sleeve 11 to drive and push the support leg 701.

[0042] During operation: Whether controlling the gripper 4 or locking the nut 8, control is achieved through the long sleeve 11. Rotating the long sleeve 11 clockwise causes the nut sleeve 7 to rotate, which in turn rotates the nut 8. The nut 8 then drives the gripper 4 to clamp the screwdriver head. To ensure a tight clamping action, the long sleeve 11 can continue to rotate after tightening, causing the nut sleeve 7 to press against the spring plate 6, locking it onto the drill body 1. To unlock, simply rotate the long sleeve 11 in the opposite direction, and the spring plate 6 will return to its original position. During this process, because the nylon liner 5 is prone to wear and breakage when in contact with metal, a first limiting groove 501 is provided on the nylon liner 5, allowing the bracket of the nut sleeve 7 to protrude. The long sleeve 11 can then directly impact or push the support leg 701 to rotate the nut sleeve 7. This prevents the nut sleeve 7 from easily contacting the nylon liner 5 during rotation, thus improving its service life.

[0043] To maintain structural strength and reliability, the long sleeve 11 is located on the outermost side and serves as an isolation and protection mechanism, so it needs to be made of metal. Therefore, stainless steel is used to improve wear resistance.

[0044] Additionally, refer to Figure 1 As shown, a decorative cap 3 is fitted onto the inner liner, and a retaining spring 2 is snapped onto the lower end of the drill body 1. The retaining spring 2 limits the lower end of the decorative cap 3 and prevents the decorative cap 3 from detaching. A bearing 9 is installed on the upper end of the nut 8, and the bearing 9 is limited by a washer 10. The upper end of the long sleeve 11 is sealed with a tail cap 12. The decorative cap 3 and the tail cap 12 can block dust and foreign objects, further extending their service life.

[0045] The above embodiments are merely illustrative of the principles and effects of the present invention and are not intended to limit the scope of the invention. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent changes made to the structure, shape, and principle of the present invention should be covered within the protection scope of the present invention.

Claims

1. A wear-resistant self-locking drill chuck, comprising a drill body (1), jaws (4), a nylon liner (5), a spring plate (6), a nut sleeve (7), a nut (8), and a long sleeve (11), wherein the jaws (4) are inserted into the drill body (1) and threadedly engaged with the nut (8), and rotating the nut (8) controls the movement of the jaws (4) on the drill body (1), characterized in that, The outer circumference of the nut part (8) is fixed with a nut sleeve (7), and a spring plate (6) is fitted inside the nut sleeve (7). The spring plate (6) locks and limits the nut sleeve (7) and the drill body (1). The lower end of the nut sleeve (7) is provided with a plate-shaped support foot (701), and the nylon liner (5) is provided with a first limiting groove (501). The support foot (701) passes through the first limiting groove (501). The lower end of the long sleeve (11) is provided with a first half tooth (111), and the lower end of the nylon liner (5) is provided with a second half tooth (502) that matches the half tooth. A second limiting groove (112) is formed between the two first half teeth (111) on the long sleeve (11) for the support foot (701) to move. When the long sleeve (11) is rotated, the support foot (701) hits the groove wall of the second limiting groove (112) of the long sleeve (11).

2. The wear-resistant self-locking drill chuck according to claim 1, characterized in that, The second limiting groove (112) is directly opposite the first limiting groove (501), and the length of the second limiting groove (112) for the support leg (701) to move is less than or equal to the length of the first limiting groove (501).

3. The wear-resistant self-locking drill chuck according to claim 2, characterized in that, The long sleeve (11) is made of stainless steel, and the hardness of the long sleeve (11) is greater than that of the support leg (701) and greater than that of the nylon lining (5).

4. The wear-resistant self-locking drill chuck according to claim 1, characterized in that, A decorative cap (3) is fitted onto the inner liner, and a retaining ring (2) is engaged at the lower end of the drill body (1). The retaining ring (2) limits the lower end of the decorative cap (3) and prevents the decorative cap (3) from detaching.

5. The wear-resistant self-locking drill chuck according to claim 1, characterized in that, The upper end of the nut (8) is fitted with a bearing (9), which is limited by a gasket (10). The upper end of the long sleeve (11) is fitted with a tail cap (12).

6. The wear-resistant self-locking drill chuck according to claim 1, characterized in that, The lower end of the nut sleeve (7) is provided with two symmetrical and arc-shaped support legs (701) in its circumferential direction, and the first limiting groove (501) and the second limiting groove (112) are both arc-shaped.

7. The wear-resistant self-locking drill chuck according to claim 1, characterized in that, The first half-tooth portion (111) on the long sleeve (11) is arranged in its circumferential direction. Two first half-tooth portions (111) are arranged symmetrically. The second half-tooth portion (502) on the nylon liner (5) is complementary to the first half-tooth portion (111).

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