Screwdriver head quick-inserting structure of lithium battery impact screwdriver

Abstract

The utility model discloses a bit quick-inserting structure of a lithium battery impact screwdriver, and relates to the technical field of power tools. According to the technical scheme, an annular groove is formed in the output shaft, a check ring is arranged in the annular groove in a sleeved mode, a flat washer is arranged on the side, away from the tool head, of the check ring, a spring is arranged on the side, away from the check ring, of the flat washer in a sleeved mode, an outer sleeve is additionally arranged, and the outer sleeve is arranged on the flat washer, the check ring and the spring in a sleeved mode. One end of the spring abuts against the flat washer, the other end of the spring abuts against the inner side wall of the outer sleeve, and the end of the output shaft is made of metal materials. The utility model has the advantages that the service life of the metal material is longer than that of a non-metal material, and the metal material is not easy to damage.

Description

Technical Field

[0001] The utility model relates to the technical field of power tools, in particular to a bit quick-insertion structure of a lithium-electric impact screwdriver. Background Art

[0002] Impact tools, such as impact wrenches, provide an impact rotational force or intermittently apply torque to a tool element or workpiece, such as a fastener, to tighten or loosen the fastener. Impact wrenches are typically used where high torque is required, such as to tighten relatively large fasteners or to loosen or remove stuck fasteners (e.g., automotive lug nuts on axle studs) that are otherwise impossible to remove or difficult to remove using hand tools. An impact tool with a quick-connect retainer assembly includes an output shaft with a spring. When a tool bit is inserted into the output shaft, the output shaft spring deforms to allow the ball stops supported by the output shaft to move out of their slots, making way for the shank of the tool bit.

[0003] For example, Chinese utility model patent with publication number CN218556911U discloses a power tool and a deformable retaining ring for the power tool, which is used to bias the ball stop in a slot formed in the side wall of the anvil by providing a deformable retaining ring. For example, when the tool bit is inserted into the drive hole of the anvil, the deformable retaining ring deforms to allow the ball stops to move out of their slots in the side wall of the anvil, thereby clearing a path for the shaft of the tool bit to be fully inserted into the drive hole. Once the tool bit is inserted, a retainer (such as an outer sleeve surrounding the drive end of the anvil) prevents the ball stop from moving outward.

[0004] The above-mentioned prior art solution has the following defects: the use of a deformable fixing ring will cause wear and tear on itself, thus affecting the normal use of the function. Utility Model Content

[0005] In view of the deficiencies in the prior art, the purpose of the utility model is to provide a bit quick-insertion structure for a lithium-electric impact screwdriver, so as to solve the problems mentioned in the background technology.

[0006] The above-mentioned purpose of the utility model is achieved through the following technical solutions:

[0007] A bit quick-insertion structure for a lithium-ion impact driver comprises a tool head and an output shaft, wherein the tool head and the output shaft are clamped, an annular groove is formed on the output shaft, a retaining ring is sleeved in the annular groove, a flat washer is provided on the retaining ring away from the tool head, a spring is sleeved on the flat washer away from the retaining ring, and an outer sleeve is further provided, the outer sleeve is sleeved on the flat washer, the retaining ring and the spring, one end of the spring abuts against the flat washer and the other end of the spring abuts against the inner side wall of the outer sleeve, and the end of the output shaft is made of metal material.

[0008] In a preferred example, the utility model can be further configured as follows: the retaining ring and the flat washer are made of metal material, and the flat washer and the retaining ring are fixedly connected.

[0009] In a preferred example, the utility model can be further configured as follows: a groove is opened on the inner side of the output shaft, a steel ball and an elastic block are clamped in the groove, and the steel ball block and the elastic block are in abutment with each other.

[0010] In a preferred example, the utility model can be further configured as follows: a convex edge is provided at one end of the groove close to the inner wall, one side of the elastic block is overlapped with the convex edge, and one side of the lower hemisphere of the steel ball is overlapped with the convex edge.

[0011] In a preferred example, the present invention can be further configured as follows: one side of the upper end of the elastic block abuts against the outer sleeve.

[0012] In a preferred example, the utility model can be further configured as follows: an escape groove is provided at one end of the outer sleeve close to the elastic block.

[0013] In a preferred example, the utility model can be further configured as follows: the output shaft sleeve is provided with a disc spring, the disc spring sleeve is located inside the outer sleeve and a portion of the disc spring sleeve is sleeved on the elastic block.

[0014] In summary, the present invention includes at least one of the following beneficial technical effects:

[0015] 1. Metal materials have a longer service life than non-metal materials, and metal materials are not easily damaged;

[0016] 2. By setting the coil spring, the force applied when inserting the tool head can be adjusted by adjusting the clamping force of the coil spring; in addition, the coil spring can also clamp the elastic block to prevent it from falling or shifting. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the overall structure of this technical solution;

[0018] Figure 2 It is a schematic diagram of the internal structure of this technical solution;

[0019] Figure 3 It is a cross-sectional schematic diagram of this technical solution.

[0020] Figure numerals: 1. tool head; 2. output shaft; 3. matching groove; 4. groove; 5. steel ball; 6. elastic block; 7. avoidance groove; 8. annular groove; 9. retaining ring; 10. flat washer; 11. spring; 12. outer sleeve; 13. convex edge; 14. disc spring. DETAILED DESCRIPTION

[0021] The utility model is further described in detail below in conjunction with the accompanying drawings.

[0022] like Figure 1-3 As shown, a quick-insertion structure of a lithium-electric impact screwdriver disclosed in the technical solution includes a tool head 1 and an output shaft 2. The tool head 1 and the output shaft 2 are snap-connected. Since the tool head 1 and the output shaft 2 are snap-connected, the tool head 1 can be easily replaced to achieve the effect of being suitable for different tool heads 1. A matching groove 3 for snapping with the output shaft 2 is provided on the tool head 1. The end of the output shaft 2 is made of metal material. The use of metal material can reduce its own wear and tear, thereby achieving the effect of extending the service life of the device. In addition, it can also prevent the device from being damaged and affecting the normal use of the device.

[0023] A groove 4 is provided on the inner side of the output shaft 2, and a steel ball 5 and an elastic block 6 are clamped in the groove 4. The steel ball 5 and the elastic block 6 are in contact with each other, and the abutting force here requires the steel ball 5 to produce a slight deformation on the elastic block 6, but not the maximum deformation. The steel ball 5 and the elastic block 6 provided here are the main structure of the clamping structure, which are clamped by the steel ball 5 and the matching groove 3. The setting of the elastic block 6 provides space for the displacement of the steel ball 5 on the one hand (through the deformation of the elastic block 6), and on the other hand, it also allows the elastic block 6 to abut against the steel ball 5 to prevent movement. An avoidance groove 7 is provided at one end of the outer sleeve 12 near the elastic block 6. The avoidance groove 7 provided here is intended to allow the steel ball 5 to produce an upward displacement.

[0024] The output shaft 2 is provided with an annular groove 8, and a retaining ring 9 is sleeved in the annular groove 8. A flat washer 10 is provided on the side of the retaining ring 9 away from the tool head 1. The retaining ring 9 and the flat washer 10 are fixedly connected. Here, an integral setting is selected to reduce the matching accuracy of the two. The retaining ring 9 and the flat washer 10 are made of metal material. A spring 11 is sleeved on the side of the flat washer 10 away from the retaining ring 9, and an outer sleeve 12 is also provided. The outer sleeve 12 is sleeved on the flat washer 10, the retaining ring 9 and the spring 11. One end of the spring 11 abuts against the flat washer 10 and the other end of the spring 11 abuts against the inner wall of the outer sleeve 12. The structure provided here can limit the steel ball 5 to prevent the steel ball 5 from slipping off and causing the device to fail. One side of the upper end of the elastic block 6 abuts against the outer sleeve 12. Here, the steel ball 5 is limited by the elastic block 6 and the outer sleeve 12 together.

[0025] In addition, a convex edge 13 is provided at one end of the groove 4 near the inner wall, one side of the elastic block 6 overlaps the convex edge 13, and one side of the lower hemisphere of the steel ball 5 overlaps the convex edge 13. The purpose of providing the convex edge 13 here is to prevent the steel ball 5 and the elastic block 6 from slipping when the tool head 1 is not inserted.

[0026] The output shaft 2 is sleeved with a coil spring 14, which is sleeved inside the outer sleeve 12 and sleeved on the elastic block 6. Here, the force when inserting the tool head 1 can be adjusted by adjusting the preload force of the coil spring 14. In addition, the coil spring 14 can also clamp the elastic block 6 to prevent it from falling and shifting.

[0027] The implementation principle of this embodiment is: when the tool head 1 is inserted into the driving hole of the output shaft 2, the tool head 1 pushes the steel ball 5 inward, and the elastic block 6 allows the steel ball 5 to move axially to escape the axial limit of the outer sleeve 12, that is, to move in the direction of the avoidance groove 7. At the same time, the disc spring 14 radially expands and deforms to allow the steel ball 5 to move radially, so that the steel ball 5 moves out of the narrow groove of the output shaft 2, so that the tool head 1 is completely inserted into the output shaft 2. Once the tool head 1 is inserted, the outer sleeve 12 prevents the steel ball 5 from continuing to move radially outward. After the tool head 1 is inserted into the output shaft 2 and the steel ball 5 passes over the hexagonal straight edge of the tool head 1, that is, when the steel ball 5 and the matching groove 3 are engaged, it returns to the initial position under the action of the elastic force of the elastic member 6 and the disc spring 14 and is engaged in the groove 4 of the tool head 1.

[0028] In order to remove the inserted tool head 1, the outer sleeve 12 is pulled toward the end of the output shaft 2 to expose the steel ball 5 at the axial limit point of the outer sleeve 12, and the steel ball 5 is allowed to move radially so that the tool head 1 can be pulled out smoothly.

[0029] The embodiments of this specific implementation method are all preferred embodiments of the utility model, and are not intended to limit the protection scope of the utility model. Therefore, all equivalent changes made based on the structure, shape, and principle of the utility model should be included in the protection scope of the utility model.

Claims

1. A quick-insertion structure for a bit of a lithium-electric impact screwdriver, comprising a tool head (1) and an output shaft (2), wherein the tool head (1) and the output shaft (2) are snap-connected, and characterized in that: The output shaft (2) is provided with an annular groove (8), a retaining ring (9) is sleeved in the annular groove (8), a flat washer (10) is provided on the side of the retaining ring (9) away from the tool head (1), a spring (11) is sleeved on the side of the flat washer (10) away from the retaining ring (9), and an outer sleeve (12) is also provided, the outer sleeve (12) is sleeved on the flat washer (10), the retaining ring (9) and the spring (11), one end of the spring (11) abuts against the flat washer (10) and the other end of the spring (11) abuts against the inner wall of the outer sleeve (12), and the end of the output shaft (2) is made of metal material.

2. The quick-insertion structure of a lithium-electric impact screwdriver according to claim 1, characterized in that: The retaining ring (9) and the flat washer (10) are made of metal material, and the flat washer (10) and the retaining ring (9) are fixedly connected.

3. The quick-insertion structure of a bit for a lithium-electric impact driver according to claim 1, characterized in that: A groove (4) is provided on the inner side of the output shaft (2), a steel ball (5) and an elastic block (6) are clamped in the groove (4), and the steel ball (5) and the elastic block (6) are in abutment with each other.

4. The quick-insertion structure of a bit for a lithium-electric impact driver according to claim 3, characterized in that: The groove (4) is provided with a convex edge (13) at one end close to the inner wall, one side of the elastic block (6) is overlapped with the convex edge (13), and one side of the lower hemisphere of the steel ball (5) is overlapped with the convex edge (13).

5. The quick-insertion structure of a bit for a lithium-electric impact driver according to claim 3, characterized in that: One side of the upper end of the elastic block (6) abuts against the outer sleeve (12).

6. The bit quick-insertion structure of a lithium-electric impact driver according to claim 5, characterized in that: An escape groove (7) is formed at one end of the outer sleeve (12) close to the elastic block (6).

7. The bit quick-insertion structure of a lithium-electric impact driver according to claim 3, characterized in that: The output shaft (2) is sleeved with a disc spring (14), which is sleeved on the inner side of the outer sleeve (12) and has a section sleeved on the elastic block (6).

Images