A locking device for a power knife seat drive shaft

Abstract

A locking device of a power tool holder transmission shaft relates to the technical field of power tool holder, including the locking device between the power tool holder body and the transmission shaft, the locking device includes the locking device body, the fixed pin, the wave bead screw and the flat head screw, the locking device body is "Y" shape, the upper mouth is set as the arc surface, the tooth clamping block of the outside convex is equipped on both sides of the arc surface, the locking device body is arranged in the transmission shaft groove on the outer circular surface of the transmission shaft through the tooth clamping block of both sides of the arc surface, the fixed pin is arranged between the positioning hole of the middle part of the locking device body and the end face of the power tool holder body, the threaded hole is set in the side surface of the locking device body, the threaded hole is communicated with the positioning hole, the wave bead screw and the flat head screw are sequentially connected in the threaded hole from inside to outside, the front end of the wave bead screw is tightly pressed on the fixed pin in the positioning hole, the structure is simple and compact, convenient operation, the defect that the clamping plate is extremely easy to slide in the power tool holder body in the prior art is solved.

Description

Technical Field

[0001] This utility model relates to the field of power tool holder technology, and in particular to a locking device for the drive shaft of a power tool holder. Background Technology

[0002] As is well known, currently, when changing collets or tools in a power tool holder, the nut needs to be loosened. Because the nut and shaft of the original power tool holder are threaded together, making disassembly difficult, and the shaft rotates during disassembly, the existing method for tightening and loosening the nut is: one hand holds a hook wrench to fix the drive shaft, while the other hand rotates the nut wrench to tighten or loosen the nut. This operation is very inconvenient and prone to slippage, leading to hand injuries. To solve these problems, existing technical solutions are usually: 1. Using a main and auxiliary wrench, hinge, spring, etc., to fix the shaft by engaging the wrench teeth into the keyway; 2. Using a clamping plate and a protrusion to fix the shaft. However, the first structure is more complex, inconvenient to disassemble, and easily damaged; the second structure is prone to slipping off the tool holder, making operation inconvenient. Summary of the Invention

[0003] In order to overcome the shortcomings of the prior art, this utility model discloses a locking device for a power tool holder drive shaft.

[0004] To achieve the aforementioned objective, this utility model adopts the following technical solution: A locking device for a power tool holder drive shaft includes a locking device disposed between the power tool holder body and the drive shaft. The locking device includes a locking device body, a fixing pin, a ball screw, and a flat-head set screw. The locking device body is Y-shaped, with its upper opening being an arc surface. Both sides of the arc surface are provided with protruding toothed blocks. The locking device body is engaged in the drive shaft groove on the outer circumference of the drive shaft by the toothed blocks on both sides of the arc surface. The fixing pin is disposed between the positioning hole in the middle of the locking device body and the end face of the power tool holder body. A threaded hole is provided on one side of the locking device body, which is connected to the positioning hole. A ball screw and a flat-head set screw are sequentially connected from the inside to the outside of the threaded hole. The front end of the ball screw is pressed against the fixing pin in the positioning hole.

[0005] The locking device for the power tool holder drive shaft has the same arcuate surface as the outer circular surface of the drive shaft.

[0006] The locking device for the power tool holder drive shaft includes a fixing pin comprising an integrally formed threaded section, a hexagonal section, and a cylindrical section. The threaded section and the cylindrical section are located at the center of both ends of the hexagonal section. The threaded section is threaded into a threaded hole on the end face of the power tool holder body. A concave ring is formed in the middle of the cylindrical section, and a chamfered edge is formed at the edge of the outer end of the cylindrical section. The cylindrical section is set in a positioning hole. The ball at the front end of the ball screw is pressed against the concave ring of the cylindrical section. The flat-head set screw is located in a threaded hole on the side of the locking device body and is pressed against the rear end of the ball screw.

[0007] The locking device for the power tool holder drive shaft has an arc-shaped guide slope on the upper half of the positioning hole inside the locking device body.

[0008] The locking device for the power tool holder drive shaft has a hook hole at the lower end of the locking device body.

[0009] Due to the adoption of the above technical solution, this utility model has the following beneficial effects: The locking device for the power tool holder drive shaft of this utility model is designed to lock the power tool holder body, drive shaft, and fixing pin in place by setting the arc of the arc surface of the locking device body to be the same as the arc of the outer circle of the drive shaft, inserting the protruding toothed blocks on both sides of the arc surface into the keyway of the drive shaft, and tightening the ball screw on the concave ring of the cylindrical pin with the flat-head set screw. This ensures the locking device remains securely attached to the power tool holder body, drive shaft, and fixing pin. Furthermore, the structure of the locking device body does not interfere with the nut wrench during operation, making it easier to fix the drive shaft. A bevel is provided on the positioning hole of the locking device body, and a chamfered bevel 18 is provided at the edge of the outer end of the cylindrical section, facilitating disassembly of the locking device. The fixing hole is located in the middle of the locking device body, eliminating the need to distinguish between the front and back during use, thus facilitating installation. This utility model has a simple and compact structure, is easy to operate, and solves the problem of the locking plate easily slipping out of the power tool holder body in existing technologies. Attached Figure Description

[0010] Figure 1 This is an exploded structural diagram of the present invention.

[0011] Figure 2 This is a three-dimensional structural diagram of the present invention.

[0012] Figure 3 This is a structural schematic diagram of the locking device of this utility model.

[0013] Figure 4 This is a schematic diagram of the structure of the fixing pin of this utility model.

[0014] In the diagram: 1. Fixing pin; 2. Power tool holder body; 3. Drive shaft groove; 4. Drive shaft; 5. Locking device; 6. Nut; 7. Ball screw; 8. Flat head set screw; 9. Threaded hole; 10. Locking device body; 11. Arc-shaped surface; 12. Toothed block; 13. Hook hole; 14. Guide bevel; 15. Positioning hole; 16. Cylindrical section; 17. Concave ring; 18. Chamfered bevel; 19. Threaded section; 20. Hexagonal section. Detailed Implementation

[0015] The present invention will be explained in detail through the following embodiments. The purpose of disclosing the present invention is to protect all technical improvements within the scope of the present invention.

[0016] Combined with appendix Figure 1-4 The locking device for the power tool holder drive shaft includes a locking device 5 disposed between the power tool holder body 2 and the drive shaft 4. The locking device 5 includes a locking device body 10, a fixing pin 1, a ball screw 7, and a flat-head set screw 8. The locking device body 10 is Y-shaped and symmetrical on both sides, with its upper opening configured as an arc-shaped surface 11. Both sides of the arc-shaped surface 11 are provided with protruding toothed blocks 12. The curvature of the arc-shaped surface 11 of the locking device body 10 is consistent with the outer diameter of the drive shaft 4. With the same curvature, the locking device body 10 is engaged in the drive shaft groove 3 on the outer circular surface of the drive shaft 4 by the toothed blocks 12 on both sides of the arc surface 11. The fixing pin 1 is set between the positioning hole 15 in the middle of the locking device body 10 and the end face of the power knife holder body 2. A threaded hole 9 is provided on one side of the locking device body 10, and the threaded hole 9 is connected to the positioning hole 15. An arc-shaped guide slope 14 is provided on the upper half of the positioning hole 15 on the inner surface of the locking device body 10.

[0017] Ball screws 7 and flat-head set screws 8 are connected sequentially from the inside to the outside in the threaded hole 9. The front end of the ball screw 7 is pressed against the fixing pin 1 in the positioning hole 15. The locking device body 10 is Y-shaped, with its upper opening set as an arc surface 11. The arc surface 11 is used to cooperate with the outer circular surface of the transmission shaft 4, and is clamped in the groove 3 of the transmission shaft by the toothed block 12, which facilitates the rotation of the locking device body and thus drives the transmission shaft to rotate to the appropriate position.

[0018] Furthermore, the fixing pin 1 includes an integrally formed threaded section 19, a hexagonal section 20, and a cylindrical section 16. The threaded section 19 and the cylindrical section 16 are located at both ends of the hexagonal section 20. The threaded section 19 is threaded into the threaded hole on the end face of the power tool holder body 2. A concave ring 17 is provided in the middle of the cylindrical section 16. A chamfered edge 18 is provided at the edge of the outer end of the cylindrical section 16. The cylindrical section 16 is set in the positioning hole 15. The ball at the front end of the ball screw 7 is pressed against the concave ring 17 of the cylindrical section 16. The flat-head set screw 8 is located in the threaded hole 9 on the side of the locking device body 10 and is pressed against the rear end of the ball screw 7. The threaded section 19 of the fixing pin 1 is fixed in the threaded hole on the end face of the power tool holder body 2. The ball screw 7 is tightened by the flat head set screw 8. The ball of the ball screw 7 is inserted into the concave ring 17 of the cylindrical section 16, thereby achieving relative fixation between the locking device body 10 and the fixing pin 1.

[0019] The locking device for the power tool holder drive shaft described in this utility model involves mounting a drive shaft 4 on the power tool holder body 2, with a nut 6 fixed to the front end of the drive shaft 4. This structure is existing technology. When disassembling the nut 6, the threaded section 19 of the fixing pin 1 is threaded into the threaded hole on the end face of the power tool holder body 2. An arc-shaped groove is provided at the flange corresponding to the end face of the power tool holder body 2, without affecting the connection of the threaded section 19. The arc-shaped surface 11 of the locking device body 10 is aligned with the outer circular surface of the drive shaft 4. At this time, the toothed blocks 12 on both sides of the arc-shaped surface 11 are engaged in the groove 3 of the drive shaft, and the lower part of the locking device body 10 is raised to the level of the drive shaft. Figure 2 As shown, turning the locking device body 10 drives the transmission shaft 4 to rotate to a suitable position, inserting the cylindrical section of the cylindrical pin 1 into the positioning hole 15 of the locking device body 10. The ball at the front end of the ball screw 7 is inserted into the concave ring 17 of the cylindrical section 16. At this time, the ball screw 7 is set in the threaded hole 9, and the flat-head set screw 8 is set at the rear of the ball screw 7. The ball screw 7 is a prior art technology, in which the head ball is pushed into the concave ring 17 of the fixing pin by the internal spring. The flat-head set screw 8 is used to tighten the ball screw 7 and prevent the ball screw from being tightened. 7. Displacement and detachment ensure that the locking device body 10 is fixed on the transmission shaft 4 and will not fall off. The cooperation between the power tool holder body 2, the transmission shaft 4, and the locking device 5 achieves the fixation of the transmission shaft 4. Finally, the installation or removal of the nut 6 can be completed by using a nut wrench to loosen or tighten the nut 6. This utility model is easy to operate, effectively improves work efficiency, and reduces safety hazards. In practical applications, the hardness of the working part reaches 30HRC-35HRC to meet the strength requirements required when removing the nut.

[0020] The parts of this utility model not described in detail are existing technologies.

[0021] The embodiments selected herein for the purpose of disclosing the inventive objectives of this utility model are currently considered appropriate; however, it should be understood that this utility model is intended to include all variations and modifications of the embodiments that fall within the scope of this concept and utility model.

Claims

1. A locking device for a power tool holder drive shaft, comprising a locking device disposed between the power tool holder body and the drive shaft; characterized in that: The locking device includes a locking device body, a fixing pin, ball screws, and flat-head set screws. The locking device body is Y-shaped with an arc-shaped upper opening. On both sides of the arc-shaped surface, there are protruding toothed blocks. The locking device body is locked in the drive shaft groove on the outer circumference of the drive shaft by the toothed blocks on both sides of the arc-shaped surface. The fixing pin is located between the positioning hole in the middle of the locking device body and the end face of the power tool holder body. A threaded hole is opened on one side of the locking device body, which is connected to the positioning hole. Ball screws and flat-head set screws are connected sequentially from the inside to the outside in the threaded hole. The front end of the ball screw is pressed against the fixing pin in the positioning hole.

2. The locking device for the power tool holder drive shaft according to claim 1, characterized in that: The curvature of the arc surface of the locking device body is set to be the same as the curvature of the outer circle surface of the drive shaft.

3. The locking device for the power tool holder drive shaft according to claim 1, characterized in that: The fixing pin includes an integrally formed threaded section, a hexagonal section, and a cylindrical section. The threaded section and the cylindrical section are located at the center of both ends of the hexagonal section. The threaded section is threaded into the threaded hole on the end face of the power tool holder body. A concave ring is provided in the middle of the cylindrical section. A chamfered edge is provided at the edge of the outer end of the cylindrical section. The cylindrical section is set in the positioning hole. The ball at the front end of the ball screw is pressed against the concave ring of the cylindrical section. The flat-head set screw is located in the threaded hole on the side of the locking device body and is pressed against the rear end of the ball screw.

4. The locking device for the power tool holder drive shaft according to claim 1, characterized in that: An arc-shaped guide slope is provided on the upper half of the positioning hole inside the body of the locking device.

5. The locking device for the power tool holder drive shaft according to claim 1, characterized in that: A hook hole is provided at the lower end of the locking device body.

Images