Self-locking type hand-tight drill chuck and self-locking assembly

Abstract

The invention relates to a self-locking type hand-tight drill chuck and a self-locking assembly, an elastic sheet is arranged in the self-locking assembly, the elastic sheet is provided with a locking end, the self-locking assembly comprises a locking ring capable of being sleeved outside a drill body of the hand-tight drill chuck, and the locking ring is provided with a metal arch-shaped gasket capable of being placed on a supporting step in the middle of the drill body and supporting a drill chuck nut. Radial extension structures are arranged on the outer side of the metal arch-shaped gasket at intervals, when the drill chuck works, the arch-shaped structures in the metal arch-shaped gasket are pressed, the arch-shaped structures are flattened and elastically deform, the radial extension structures extend outwards in the radial direction, and the arch-shaped structures form sliding contact lines extending in the circumferential direction. The self-locking structure can provide a self-locking function and can be combined with the rotating sleeve to improve the stability of the drill chuck in the high-speed rotating process, and normal exertion of the self-locking function is guaranteed in a multiple mode.

Description

Technical Field

[0001] The present invention relates to a self-locking hand-tight drill chuck and a self-locking assembly therein. Background Art

[0002] A drill chuck is provided with a drill body, a jaw, and a nut. The nut is threadedly connected to the jaw. A rotating sleeve is provided in the hand-tight drill chuck. The rotating sleeve is directly or connected to the nut through a connecting structure. By manually operating the rotating sleeve, the nut is rotated to drive the jaw to move forward or backward, so that the jaw clamps or releases the drill bit. The nut is supported on a gasket in the middle of the drill chuck through a ball bearing ring, or directly supported on a step in the middle of the drill body through a ball bearing ring. The self-locking hand-tight drill chuck is a hand-tight drill chuck with a self-locking mechanism added, which has a self-locking function. The self-locking mechanism generally includes a shrapnel. The shrapnel is arranged to be connected to the nut to rotate together, and is also connected to the rotating sleeve. When the drill chuck is in a non-clamping state, the rotating sleeve drives the nut to rotate through the shrapnel. During the rotation process from the clamping state to the self-locking state and unlocking from the self-locking state, the rotating sleeve drives the nut to rotate through keyway cooperation. The shrapnel is provided with a locking end. In the self-locking state, the locking end cooperates with a toothed ring provided on the drill body to prevent the nut from rotating in the reverse direction.

[0003] In actual use, when the drill chuck is clamping the drill bit for drilling work, there are various reasons that may cause the nut to loosen in the reverse direction, ultimately resulting in the jaw releasing the drill bit or the locking state of the drill chuck failing. In the past, an additional disc-shaped support structure was used to solve this problem. However, this also increases the number of parts, which is not conducive to cost control. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a new type of self-locking hand-tight drill chuck and a self-locking assembly. The self-locking structure can self-provide an anti-loosening function, and can also be combined with the rotating sleeve to improve the stability of the drill chuck during high-speed rotation, and multiple guarantees the normal operation of the self-locking function.

[0005] For this purpose, according to the first aspect of the present invention, the following technical solution is adopted: The self-locking assembly of the hand-tight drill chuck, a shrapnel is provided in the self-locking assembly, the shrapnel is provided with a locking end, and it is characterized in that the self-locking assembly includes a lock ring that can be sleeved outside the drill body of the hand-tight drill chuck. The lock ring is provided with a metal arched gasket that can be placed on the support step in the middle of the drill body and support the drill chuck nut. Radially extending structures are spaced apart on the outside of the metal arched gasket. When the drill chuck is working, the arched structure in the metal arched gasket is compressed, the arched structure is flattened and elastically deformed, the radially extending structures extend radially outwards, and the arched structure forms a sliding contact line extending in the circumferential direction; On the outside of the metal arched gasket, between the radially extending structures, a backward bending structure is provided, and the shrapnel is provided on the backward bending structure.

[0006] Further, a rotary sleeve positioning and connecting structure is also provided on the backward bending structure, and a positioning piece that bends forward and is connected to the nut.

[0007] Further, the locking ring is an integral structure formed by punching a metal sheet, and the thickness of the metal sheet is 0.2 - 1.5 mm.

[0008] According to the second aspect of the present invention, the following technical solutions are adopted: A self-locking hand-tight drill chuck includes a drill body, a chuck jaw, and a nut. The nut is threadedly connected to the chuck jaw. A rotary sleeve is provided in the drill chuck, and the rotary sleeve is connected to the nut through a connecting structure. The drill body is provided with a central support step, and the drill chuck is provided with a self-locking structure. The self-locking structure includes a self-locking component and teeth fixed relative to the drill body. It is characterized in that the self-locking component is the above-mentioned self-locking component; The metal arched gasket is sleeved outside the drill body and placed between the central support step of the drill body and the nut. When the drill chuck is working, the arched structure in the metal arched gasket is compressed and can press against the nut. When the arched structure is flattened and elastically deformed, the radially extending structure extends radially outward to the rotary sleeve and forms a combined structure with the rotary sleeve. When the arched structure is not under pressure, the radially extending structure disengages from the rotary sleeve, and the nut rotates flexibly through the sliding contact line.

[0009] On the basis of adopting the above technical solutions, the present invention can also adopt the following further technical solutions, or use these further technical solutions in combination: The top end of the arched structure is located at the end close to the central support step, and the bottom end of the arched structure is located at the end close to the nut, or vice versa.

[0010] The metal arched gasket is directly placed on the central support step of the drill body, and the nut is directly placed on the metal arched gasket.

[0011] The teeth are provided on the side of the central support step.

[0012] The elastic piece is provided with a locking end. When the drill chuck is in the self-locking state, the locking end cooperates with the teeth to prevent the nut from rotating in the reverse direction. A plurality of grooves are provided inside the rotary sleeve, so as to be connected to the locking ring when the drill chuck is in different states. A cam surface is also provided inside the rotary sleeve for cooperating with the elastic piece to control the locking end of the elastic piece to insert into or disengage from the teeth. When the drill chuck is in the non-clamping state, the rotary sleeve drives the nut to rotate through the locking ring. During the rotation process from the clamping state to the self-locking state and when unlocking from the self-locking state, the rotary sleeve drives the nut to rotate through the cooperation of the key and the groove wall.

[0013] The lock ring is connected to the nut in the circumferential and radial directions through the cooperation of the positioning piece and the nut keyway.

[0014] Due to the adoption of the technical solution of the present invention, the present invention has high reliability during operation, but has a simple structure and few components; in the self-locking assembly, the metal arched gasket relies on the annular middle step of the drill body to form a reliable support for the nut that can prevent reverse loosening, and forms a sliding contact line extending in the circumferential direction, which can reduce the frictional resistance and play a role in assisting sliding, overcoming the service life problem caused by the ball jamming; moreover, with the deformation of the arched structure of the present invention, the radially extending structure automatically extends outward and combines with the rotating sleeve, improving the high-speed rotation attitude of the rotating sleeve, and also having a good effect on improving the self-locking function of preventing accidental withdrawal. For the operation of holding an electric drill to drill holes, it can reduce the difficulty of control. Especially for a drill chuck with a plastic rotating sleeve, its cost is low, but the plastic rotating sleeve is often non-circular. Adopting the solution of the present invention, on the one hand, it conforms to the characteristics of low cost of this type of drill chuck, and at the same time significantly improves the control performance and anti-loosening performance. Description of the Drawings

[0015] Figure 1 It is an exploded view of Embodiment 1 of the present invention.

[0016] Figure 2 、 3 They are respectively cross-sectional views of the drill chuck of Embodiment 1 of the present invention in the tightened state and the loosened state.

[0017] Figure 4 、 5 They are respectively Figure 3 Cross-sectional views A-A and B-B in

[0018] Figure 6 、 7 、8 are respectively the three-dimensional view, top view and cross-sectional view of the lock ring of Embodiment 1 of the present invention, where Figure 8 is Figure 7 Cross-sectional view C-C of

[0019] Figure 9 It is a cross-sectional view of the lock ring of Embodiment 2 of the present invention. Detailed Embodiments

[0020] Referring to the attached Figure 1-8 The self-locking hand-tight drill chuck provided by the present invention includes a rotating sleeve 1, a drill body 5, a nut 2 and three jaws 6. The nut 2 is threadedly connected to the three jaws 6. The drill body 5 is provided with inclined jaw holes 51. The jaws 6 pass through the jaw holes 51 and can slide back and forth along the jaw holes 51 under the drive of the nut 2. The drill body 5 is provided with a middle support step 50.

[0021] The drill chuck is provided with a self-locking structure, which includes a self-locking component and teeth 52 fixed relative to the drill body. The self-locking component includes a locking ring 300 that can be sleeved on the outside of the drill body of the hand-tight drill chuck, and the locking ring 300 is provided with a metal arch gasket 3 that can be placed on the support step 50 in the middle of the drill body and support the nut 2. The outer side of the metal arch gasket 3 is spaced apart to provide a radial extension structure 31. When the drill chuck clamps the drill bit and is working, the arch structure 32 in the metal arch gasket 3 is compressed, the arch structure 32 is flattened and elastically deformed, and the radial extension structure 31 extends radially outward, and the arch structure 32 forms a sliding contact line 33 extending in the circumferential direction, which can be formed at the arch top or arch bottom of the arch structure 32 that contacts the bottom surface of the nut 2 or the surface 50 of the support step in the middle of the drill body. When the drill chuck clamps the drill bit and is working, the arch structure 32 in the metal arch gasket 3 is compressed, the arch structure 32 is flattened and elastically deformed, and its elastic deformation forms potential energy as the anti-loosening force of the tightening nut. As the arch structure 32 deforms, the radial extension structure 31 automatically extends radially outward and combines with the rotating sleeve 1, for example, against the inner wall of the rotating sleeve 1. If the rotating sleeve is made of plastic material, the metal arch gasket 3 relies on the clamping force of the nut 2 and can be slightly inserted into the inner wall of the rotating sleeve to form a composite structure in the working state, thereby improving the high-speed rotation posture of the rotating sleeve 1 and changing the control of the self-locking structure. The multiple effects work together to prevent the drill bit from loosening or the locking state of the drill chuck from failing.

[0022] The radial extension structure 31 is discontinuously located on the outside of the metal arch gasket 3. On the outside of the metal arch gasket 3, between the radial extension structures 31, a backward bending structure 30 is provided, and the spring sheet 34 is provided on the backward bending structure 30, and the spring sheet 34 is provided with a locking end 341. A rotating sleeve positioning connection structure is also provided on the backward bending structure 30, and the rotating sleeve positioning connection structure can adopt a spring sheet 35 that plays a connecting role, and a protrusion 351 facing outward is provided on the rotating sleeve positioning connection structure; the metal arch gasket 3 is also provided with a positioning sheet 36 that is bent forward and connected to the nut. When the drill chuck is in the self-locking state, the locking end 341 cooperates with the tooth 52 to prevent the nut 2 from rotating in the opposite direction; a plurality of grooves 11 are arranged inside the rotating sleeve 1, and are connected with the protrusion 351 on the spring piece 35 when the drill chuck is in different states; a cam surface 12 is also arranged inside the rotating sleeve 1 for cooperating with the spring piece 34 to control the locking end 341 of the spring piece 34 to be inserted into the tooth 52 or to be disengaged from the tooth 52; when the drill chuck is in the non-clamping state, the rotating sleeve 1 drives the nut 2 to rotate through the spring piece 34; in the rotation process from the clamping state to the self-locking state and when unlocking from the self-locking state, the rotating sleeve 1 drives the nut 2 to rotate through the cooperation between the key and the groove wall 13.

[0023] The locking ring 300 is an integral structure formed by punching a metal plate, and the thickness of the metal plate is 0.2-1.5 mm.

[0024] The locking ring 300 is sleeved outside the drill body 5 by using the metal arched gasket 3. The metal arched gasket 3 is placed between the middle support step 50 of the drill body and the nut 2. The metal arched gasket 3 is directly placed on the middle support step 50 of the drill body, and the nut 2 is directly placed on the metal arched gasket 3. The nut rotates flexibly through the sliding contact wire 33.

[0025] In this embodiment, the top end of the arched structure 32 is located at the end close to the middle support step 50, and the bottom end of the arch is located at the end close to the nut 2. As Figure 9 shown, the direction of the arched structure 32 can also be opposite, the top end of the arch can also be located at the end close to the nut 2, and the bottom end of the arched structure is located at the end close to the middle support step 502.

[0026] The teeth 52 can be arranged on the side of the middle support step 50.

[0027] The above are only specific embodiments of the present invention, but the structural features of the present invention are not limited thereto. Any changes or modifications made by those skilled in the art within the scope of the present invention are covered by the protection scope of the present invention.

Claims

1. Self-locking component of hand-tight drill chuck, with a spring piece (34) arranged in the self-locking component, and a locking end (341) arranged on the spring piece, characterized in that The self-locking assembly includes a lock ring (300) that can be sleeved outside the body (5) of the hand-tight drill chuck. The lock ring (300) is provided with a metal arched gasket (3) that can be placed on the middle support step (50) of the drill body and support the drill chuck nut (2). The outer side of the metal arched gasket (3) is provided with radially extending structures (31) at intervals. When the drill chuck is working, the arched structure (32) in the metal arched gasket (3) is compressed, and the arched structure (32) is flattened and elastically deformed. The radially extending structures (31) extend radially outwards, and the arched structure (32) forms a sliding contact line (33) extending in the circumferential direction. On the outer side of the metal arched gasket (3), between the radially extending structures (31), a backward bending structure (30) is provided, and a spring piece (34) is provided on the backward bending structure (30).

2. The self-locking assembly of the hand-tight drill chuck according to claim 1, characterized in that A rotary sleeve positioning and connecting structure is also provided on the backward bending structure (30), and a positioning piece (36) that bends forward and is connected to the nut (2) is provided on the outer side of the metal arched gasket (3).

3. The self-locking assembly of the hand-tight drill chuck according to claim 1, characterized in that The lock ring (300) is an integral structure formed by punching a metal plate, and the thickness of the metal plate is 0.2 - 1.5 mm.

4. Self-locking hand-tight drill chuck, comprising a drill body (5), a jaw (6), and a nut (2), the nut (2) is threadedly connected to the jaw (6), a rotating sleeve (1) is provided in the drill chuck, the rotating sleeve (1) is connected to the nut (2) through a connecting structure, a middle support step (50) is provided on the drill body, and a self-locking structure is provided on the drill chuck, the self-locking structure includes a self-locking component and a tooth (52) fixed relative to the drill body; characterized in that, The self-locking assembly is the self-locking assembly according to claim 1 or 2. The metal arched gasket (3) is sleeved outside the drill body (5) and placed between the middle support step (50) of the drill body and the nut (2). When the drill chuck is working, the arched structure (32) in the metal arched gasket (3) is compressed and can press against the nut (2). When the arched structure (32) is flattened and elastically deformed, the radially extending structures (31) extend radially outwards to the rotary sleeve (1) and form a combined structure with the rotary sleeve (1). When the arched structure (32) is not compressed, the radially extending structures (31) disengage from the rotary sleeve (1), and the nut (2) rotates flexibly through the sliding contact line (33).

5. The self-locking hand-tightening drill chuck according to claim 4, characterized in that The top end of the arched structure (32) is located at the end close to the middle support step (50), and the bottom end of the arched structure (32) is located at the end close to the nut (2), or vice versa.

6. The self-locking hand-tightening drill chuck according to claim 4, wherein The metal arched gasket (3) is directly placed on the middle support step (50) of the drill body, and the nut (2) is directly placed on the metal arched gasket (3).

7. The self-locking hand-tightening drill chuck according to claim 4, characterized in that The tooth (52) is provided on the side of the middle support step (50).

8. The self-locking hand-tightening drill chuck according to claim 4, characterized in that The spring piece (34) is provided with a locking end (341). When the drill chuck is in a self-locking state, the locking end (341) cooperates with the tooth (52) to prevent the nut (2) from rotating in the reverse direction. A plurality of grooves (11) are provided inside the rotating sleeve (1) so as to be connected to the locking ring when the drill chuck is in different states. A cam surface (12) is further provided inside the rotating sleeve for cooperating with the elastic piece (34) to control the locking end (341) of the elastic piece (34) to insert into or disengage from the tooth (52). When the drill chuck is in a non-clamping state, the rotating sleeve (1) drives the nut (2) to rotate through the locking ring (300). During the rotation process from the clamping state to the self-locking state and when unlocking from the self-locking state, the rotating sleeve (1) drives the nut (2) to rotate through the cooperation between the key and the groove wall.

9. The self-locking hand-tightening drill chuck according to claim 4, wherein The locking ring (300) is connected to the nut (2) in the circumferential and radial directions through the keyway cooperation between the positioning piece (36) and the nut (2).

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