Hand-tight drill chuck

Abstract

The utility model provides a hand-tight drill chuck, and belongs to the technical field of hand-tight drill chucks. The technical problem of an existing hand-tight drill chuck is solved. The hand-tight drill chuck comprises a drill body, a nut, a bearing, a gasket and a rotating sleeve, the nut, the bearing and the gasket are all arranged on the periphery of the drill body in a sleeving mode, the bearing is arranged between the nut and the gasket in the axial direction of the drill body, the rotating sleeve is arranged on the periphery of the nut, the bearing and the gasket in a sleeving mode at the same time, and the rotating sleeve and the nut are positioned in the circumferential direction. A gap is reserved between the outer edge of the gasket and the inner wall of the rotary sleeve, and the gasket can freely rotate around the drill body. The hand-tight drill chuck can avoid the phenomenon of clamping stagnation in rotating operation after long-term use.

Description

Technical Field

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

[0002] A drill body, clamping jaws, a nut, bearings, gaskets, a rotating sleeve and a rear sleeve are provided in the hand-tight drill chuck. By rotating the nut, the clamping jaws are driven to move forward or backward, so that the drill chuck clamps or releases a drill tool.

[0003] For example, a patent with the authorization announcement number CN206763930U discloses a hand-tight drill chuck, which includes a drill body, a nut and clamping jaws. A support step is arranged in the middle of the drill body, and a gasket is placed on the support step. A second gasket is also arranged at the front part of the drill chuck corresponding to the nut. There is an anti-nut-tilting fit between the front part of the nut and the second gasket. The gasket and the second gasket are fixed on the drill body by interference fit or clamping or other anti-rotation structures. The rotating sleeve and the nut are connected by keyways, and bearings are arranged between the nut and the gasket.

[0004] The above-mentioned hand-tight drill chuck has stable clamping, but there are still deficiencies: after long-term use, dirt is likely to accumulate inside the chuck, and since the outer edge of the gasket is very close to the inner wall of the rotating sleeve, dirt is likely to adhere to this place, greatly increasing the resistance during rotation and resulting in stuck operation. Summary of the Invention

[0005] In view of the above problems existing in the prior art, the utility model provides a hand-tight drill chuck. The technical problem to be solved by the utility model is: the rotation operation of the existing hand-tight drill chuck is prone to jamming after long-term use.

[0006] The purpose of the utility model can be realized by the following technical solutions:

[0007] A hand-tight drill chuck includes a drill body, a nut, bearings, washers and a rotating sleeve. The nut, bearings and washers are all sleeved on the periphery of the drill body. The bearings are axially arranged between the nut and the washers along the drill body. The rotating sleeve is simultaneously sleeved on the periphery of the nut, bearings and washers. The rotating sleeve is circumferentially positioned with the nut. It is characterized in that a gap is left between the outer edge of the washer and the inner wall of the rotating sleeve, and the washer can freely rotate around the drill body.

[0008] When the user rotates the rotating sleeve externally, the nut can be driven to rotate relative to the drill body, and then the inclined jaws inside the drill body can be clamped or opened through the thread. This belongs to the prior art. Setting a bearing can greatly reduce the frictional resistance between the nut and the drill body during rotation, and adding a washer can be used to support the bearing to reduce the processing and manufacturing difficulty of the drill body itself; by setting a gap between the outer edge of the washer and the inner wall of the rotating sleeve, and enabling the washer to rotate freely around the drill body, the outer edge of the washer can provide internal support for the rotating sleeve, reducing the probability of deformation due to force, and at the same time, the rotating sleeve can also provide radial positioning for the washer to keep it sufficiently concentric with the drill body. Moreover, even if dirt accumulates between the inner wall of the rotating sleeve and the washer, causing the two to stick together, when the rotating sleeve rotates under force, it can directly drive the washer to rotate synchronously, avoiding the rotating sleeve from getting stuck due to excessive rotation resistance.

[0009] In the above-mentioned hand-tight drill chuck, the area of the inner wall of the rotating sleeve opposite to the outer edge of the washer has a number of circumferentially spaced relief notches. In this way, dirt is difficult to accumulate in the area of the relief notches, which helps to reduce the probability of adhesion between the inner wall of the rotating sleeve and the washer and ensure smooth operation.

[0010] In the above-mentioned hand-tight drill chuck, the outer periphery of the drill body has an annular stepped surface, and the side of the washer facing away from the bearing abuts against the stepped surface. An avoidance annular groove is provided at the inner edge of the stepped surface and is arranged circumferentially around the drill body. This helps the side surface of the washer to fully abut against the stepped surface, thereby avoiding the influence of axial deformation of the drill body on the clamping effect due to insufficient fitting of the gasket during use.

[0011] In the above-mentioned hand-tight drill chuck, a limiting stop edge is provided at the outer edge of the end face of the nut and is arranged towards the side where the bearing is located. The limiting stop edge is annular and has a gap with the bearing. The balls in the bearing protrude from the surface. In this way, when the end face of the nut abuts against the balls in the bearing, the limiting stop edge can form a limiting constraint on the position of the balls from the outside, which helps to ensure the stable position of the bearing and make the rotation operation smooth.

[0012] In the above-mentioned hand-tight drill chuck, the outer diameter of the bearing is smaller than the outer diameter of the washer. In this way, dirt will preferably accumulate between the washer and the rotating sleeve, avoiding adhesion between the bearing and the inner wall of the rotating sleeve and ensuring smooth operation of the bearing.

[0013] In the above-mentioned hand-tight drill chuck, the outer periphery of the drill body has an annular boss. The bearing is sleeved outside the boss, and there is a gap between the inner edge of the bearing and the outer periphery of the boss. The side of the bearing facing away from the washer extends beyond the surface of the boss along the axial direction of the drill body. In this way, the outer diameter of the boss is adapted to the inner diameter of the bearing, which can further form a more accurate positioning of the bearing, making the bearing operate smoothly. At the same time, the surface of the boss does not exceed the bearing, so that the nut still contacts the bearing, and the boss does not interfere with the rotation of the nut relative to the drill body, ensuring smooth rotation operation.

[0014] Compared with the prior art, the advantages of the present utility model are as follows:

[0015] In the hand-tight drill chuck, the outer edge of the washer can provide internal support for the rotating sleeve, reducing the probability of deformation caused by stress. At the same time, the rotating sleeve can also provide radial positioning for the washer to keep it sufficiently concentric with the drill body. Moreover, even if dirt accumulates between the inner wall of the rotating sleeve and the washer, causing adhesion between the two, when the rotating sleeve rotates under force, it can directly drive the washer to rotate synchronously, avoiding jamming due to excessive rotation resistance of the rotating sleeve and affecting the operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is a schematic three-dimensional structure diagram of this embodiment.

[0017] Figure 2 is a schematic top view structure diagram of this embodiment.

[0018] Figure 3 is Figure 2 the schematic cross-sectional structure diagram of A-A in

[0019] Figure 4 is Figure 3 the enlarged view of part B in

[0020] Figure 5 is a schematic three-dimensional structure diagram of the rotating sleeve in this embodiment.

[0021] In the figure, 1, drill body; 11, stepped surface; 12, relief annular groove; 13, boss;

[0022] 2, nut; 21, limiting retaining edge;

[0023] 3, bearing; 4, washer;

[0024] 5, rotating sleeve; 51, relief notch. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0025] The following are specific embodiments of the present utility model in combination with the accompanying drawings, further describing the technical solutions of the present utility model, but the present utility model is not limited to these embodiments.

[0026] As Figures 1-5As shown in the figure, this hand-tight drill chuck includes a drill body 1, a nut 2, a bearing 3, a washer 4 and a rotating sleeve 5. The rotating sleeve 5 and the bearing 3 can be existing components. The nut 2, the bearing 3 and the washer 4 are all sleeved on the periphery of the drill body 1. The bearing 3 is axially arranged between the nut 2 and the washer 4 along the drill body 1. The rotating sleeve 5 is arranged on the periphery of the nut 2, the bearing 3 and the washer 4. The rotating sleeve 5 is circumferentially positioned with the nut 2. There is a gap between the outer edge of the washer 4 and the inner wall of the rotating sleeve 5. The washer 4 can rotate freely around the drill body 1. When the user operates the rotating sleeve 5 to rotate from the outside, it can drive the nut 2 to rotate relative to the drill body 1, and then control the clamping or opening of the inclined jaws in the drill body 1 through the thread. This belongs to the prior art. Setting the bearing 3 can greatly reduce the frictional resistance between the nut 2 and the drill body 1 when the nut 2 rotates. Specifically, there are multiple circumferentially spaced relief notches 51 in the area where the inner wall of the rotating sleeve 5 faces the outer edge of the washer 4. The outer periphery of the drill body 1 has an annular stepped surface 11. The side of the washer 4 facing away from the bearing 3 abuts against the stepped surface 11. There is an avoidance annular groove 12 provided circumferentially at the inner edge of the stepped surface 11. Preferably, the nut 2 includes a body portion and a limiting cylinder sleeved on the outer periphery of the body portion. The part of the limiting cylinder exceeding the body portion forms a limiting stop edge 21 arranged towards the side where the bearing 3 is located. The limiting stop edge 21 is annular and there is a gap between it and the bearing 3. The outer diameter of the bearing 3 is smaller than the outer diameter of the washer 4. Further, the outer periphery of the drill body 1 has an annular boss 13. The outer diameter of the stepped surface 11 is larger than the outer diameter of the boss 13. The bearing 3 is sleeved on the periphery of the boss 13 and there is a gap between the inner edge of the bearing 3 and the outer periphery of the boss 13. The side of the bearing 3 facing away from the washer 4 extends beyond the surface of the boss 13 along the axis of the drill body 1.

[0027] The specific embodiments described herein are only illustrative of the spirit of the present invention. Those skilled in the art of the present invention can make various modifications or supplements to the described specific embodiments or use similar ways to replace them, but will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

Claims

1. A hand-tight drill chuck, comprising a drill body (1), a nut (2), a bearing (3), a washer (4) and a rotating sleeve (5), wherein the nut (2), the bearing (3) and the washer (4) are all sleeved on the periphery of the drill body (1), the bearing (3) is arranged between the nut (2) and the washer (4) along the axial direction of the drill body (1), and the rotating sleeve (5) is sleeved on the periphery of the nut (2), the bearing (3) and the washer (4), and the rotating sleeve (5) is positioned circumferentially with the nut (2), characterized in that: A gap is left between the outer edge of the washer (4) and the inner wall of the rotating sleeve (5), and the washer (4) can rotate freely around the drill body (1).

2. The hand-tight drill chuck according to claim 1, characterized in that: A region of the inner wall of the rotating sleeve (5) opposite to the outer edge of the gasket (4) has a plurality of circumferentially spaced gaps (51).

3. The hand-tight drill chuck according to claim 1 or 2, characterized in that: The outer periphery of the drill body (1) has an annular step surface (11), the side of the washer (4) facing away from the bearing (3) abuts against the step surface (11), and the inner edge of the step surface (11) has an avoidance annular groove (12) arranged around the circumference of the drill body (1).

4. The hand-tight drill chuck according to claim 1 or 2, characterized in that: The outer edge of the end surface of the nut (2) is provided with a limit stop edge (21) arranged toward the side where the bearing (3) is located. The limit stop edge (21) is annular and has a gap between it and the bearing (3).

5. The hand-tight drill chuck according to claim 1 or 2, characterized in that: The outer diameter of the bearing (3) is smaller than the outer diameter of the washer (4).

6. The hand-tight drill chuck according to claim 1 or 2, characterized in that: The outer periphery of the drill body (1) is provided with an annular boss (13); the bearing (3) is sleeved on the outer periphery of the boss (13) and a gap is left between the inner edge of the bearing (3) and the outer periphery of the boss (13); the side of the bearing (3) facing away from the washer (4) extends beyond the surface of the boss (13) along the axial direction of the drill body (1).

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