A die wrench without locking screw

Abstract

A die wrench that does not require a locking screw, relating to the field of thread processing device technology, includes a wrench body, two handles, and two fixing pins. The wrench body is annular with a countersunk die hole in the center and handle connecting sections on both sides. Each handle connecting section has a handle mounting screw hole, and the bottom of the handle mounting screw hole has a pin hole communicating with the countersunk die hole. One end of each handle has a threaded section that matches the handle mounting screw hole. The fixing pins have smooth shanks whose shank contours match the pin holes. This die wrench eliminates the need for screw holes on the sides and fixing screws, simplifying the structure and reducing costs. The wrench only requires its own handles to lock and fix the die.

Description

Technical Field

[0001] This invention relates to the field of thread processing equipment technology, and in particular to a die wrench that does not require tightening screws. Background Technology

[0002] A die is a tool for machining external threads. It cannot be operated independently. A die wrench is specifically used to fix the die. By manually applying torque to rotate the die, external threads are cut into the workpiece.

[0003] like Figure 1 As shown, existing die wrenches mainly use a combination of screw tightening and positioning holes to clamp and fix the die. A certain number of positioning conical recesses are machined on the outer circumference of the die, and a certain number of threaded holes are correspondingly machined on the ring seat of the die wrench. After the screw is screwed into the threaded hole, the screw tip pushes into the conical recess of the die, thus locking and fixing the die. This clamping and fixing method has the following obvious disadvantages: 1. Die wrenches require multiple screw holes on the side and a corresponding number of screws, resulting in high costs; 2. It requires the use of screwdrivers and other tools to tighten or loosen the screws one by one, and the clamping and replacement of the die is slow. 3. When replacing the die, multiple screws need to be loosened manually, and the screw heads must be pulled back to a position outside the inner wall of the countersunk hole of the die wrench before the die can be removed or replaced with a different size die. The screws are easy to fall off and there is a risk of loss. 4. After long-term use, the threads of the screws and screw holes will wear out. The screws are prone to loosening due to vibration and repeated stress, which may cause the die to suddenly shift during the cutting process. In mild cases, the threads will be scrapped, and in severe cases, it may cause safety hazards. 5. The product has multiple screw holes and exposed screws, which is not aesthetically pleasing. Summary of the Invention

[0004] To address the above problems, this invention provides a die wrench that does not require tightening screws. It eliminates the need for screw holes on the side and fixing screws, simplifying the structure and reducing costs. The die can be tightened and fixed using only its own handle.

[0005] To achieve the above objectives, the technical solution adopted by the present invention is as follows: A wrench that does not require a tightening screw includes a wrench body, two handles, and two fixing pins. The wrench body is annular with a countersunk hole in the center and handle connecting sections on both sides. Each handle connecting section has a handle mounting screw hole, and the bottom of the handle mounting screw hole has a pin hole communicating with the countersunk hole. One end of each handle has a threaded section that matches the handle mounting screw hole. The fixing pins have smooth shanks whose shank contour matches the pin hole. The annular structure of the wrench body is integrally formed with the handle connecting sections. The central axes of the two handle mounting screw holes and the two pin holes are collinear and pass through the central axis of the annular structure. In use, the fixing pins are inserted into the pin holes through the handle mounting screw holes, and the handles are screwed into the handle connecting sections. The inner end face of the handle abuts against the outer end face of the fixing pin. After tightening, the inner end of the fixing pin extends out of the inner wall of the countersunk hole along the pin hole. After loosening, it retracts and hides out of the inner wall of the countersunk hole along the pin hole.

[0006] Preferably, the handle connecting section is shaped like a frustum or a pyramid, and the widened inner side design increases structural strength.

[0007] Preferably, the other end of the handle is provided with a textured section to increase friction and facilitate the application of force.

[0008] Preferably, the textured segment is provided with a through hole. In special circumstances, such as when the handle cannot be tightened or cannot be loosened after tightening, a lever can be inserted into the through hole to facilitate tightening or loosening.

[0009] Preferably, one end of the fixing pin has a tapered tip, typically a conical shape.

[0010] Preferably, the other end of the fixing pin shank is provided with a pin head. The pin head is flat and larger than the pin shank, that is, larger than the pin hole, to serve as a stop.

[0011] Preferably, the nail head has an arched surface that is raised in an arc shape. The arched surface structure reduces friction when the inner end of the handle contacts it, ensuring that the handle can be turned more easily. At the same time, even if slight deformation occurs during long-term use, the fixing pin will not get stuck.

[0012] Preferably, a compression spring is fitted onto the nail rod, with one end of the spring abutting against the nail head and the other end abutting against the outer periphery of the pin hole at the bottom of the handle connecting section. The function of the compression spring is to allow the fixing pin to automatically retract under the action of the compression spring after the handle is loosened, facilitating the installation and removal of the die.

[0013] Preferably, the device also includes a die, the outer periphery of which matches the countersunk hole of the die. At least one pair of positioning grooves are provided on its outer periphery. Each pair of positioning grooves is symmetrically distributed and the central axis is on the same straight line, that is, located at two equal parts on the outer periphery of the die, corresponding to the pin tip. The positioning groove is generally also conical. After tightening the two handles, the pin tips of the two fixing pins are respectively pushed into the two positioning grooves of the die, which not only restricts the rotation of the die, but also achieves axial fixation.

[0014] Preferably, the number of positioning grooves on the die is two pairs, the central axes of the two pairs of positioning grooves are perpendicular to each other, and the four positioning grooves are located in four equal parts, which facilitates die assembly.

[0015] The advantages of this invention are: 1. The die wrench does not require screw holes on the side or screws for fixing, simplifying the structure and reducing costs; 2. It can lock and fix the die without the need for other tools (such as screwdrivers), only the handle itself is needed; 3. It adopts a built-in hidden fixing pin, and the surface of the pin shank and pin hole is smooth without threads, avoiding the risk of loosening or even falling off and being lost after long-term use of existing screws, ensuring the processing yield and improving safety; 4. It can quickly clamp and replace the die, improving processing efficiency; 5. The product uses a built-in hidden fixing pin, and there are no screw holes or exposed screws on the outside, making the product more aesthetically pleasing. Attached Figure Description

[0016] Figure 1 This is a structural diagram of an existing die wrench; Figure 2 This is a perspective view of the present invention; Figure 3 This is the front view of the present invention; Figure 4 for Figure 3 Sectional view along the middle AA direction; Figure 5 This is an exploded view of the present invention; Figure 6 This is a perspective view of the main body of the wrench in this invention; Figure 7 This is a front view of the wrench body in this invention; Figure 8 for Figure 7 Sectional view along the BB direction; Figure 9 This is a perspective view of the handle in this invention; Figure 10 This is a perspective view of the fixing pin and compression spring in this invention; Figure 11 This is a perspective view of the incision teeth in this invention; Figure 12 This is a side view of the tooth in this invention; Figure 13 for Figure 12 A cross-sectional view along the CC direction; Figure 14 This is a schematic diagram of the structure of the present invention after the die is installed.

[0017] Explanation of key component symbols in the diagram: 10. Wrench body; 11. Countersunk hole of die; 12. Handle connecting section; 13. Handle mounting screw hole; 14. Pin hole; 20. Handle; 21. Threaded section; 22. Corrugated section; 23. Through hole; 30. Fixing pin; 31. Pin shaft; 32. Pin tip; 33. Pin head; 34. Arch surface; 40. Compression spring; 50. Die; 51. Locating groove. Divided into two equal parts. Detailed Implementation

[0018] To more clearly illustrate the present invention, the invention will be further described below with reference to the accompanying drawings.

[0019] Example 1: As Figure 2-5 As shown, a die wrench that does not require tightening screws includes a wrench body 10, two handles 20 and two fixing pins 30.

[0020] Combination Figure 6-8 As shown, the wrench body 10 is annular, with a countersunk die hole 11 in the middle and handle connecting sections 12 on both sides. The handle connecting sections 12 are provided with handle mounting screw holes 13, and the bottom of the handle mounting screw holes 13 is provided with a pin hole 14 that communicates with the countersunk die hole 11.

[0021] Combination Figure 9 As shown, one end of the handle 20 is provided with a threaded section 21 that matches the handle mounting screw hole 13.

[0022] Combination Figure 10 As shown, the fixing pin 30 has a smooth pin shank 31, the outline of which matches the pin hole 14.

[0023] Example 2: Combination Figure 9 As shown, based on Embodiment 1, the other end of the handle 20 is provided with a mesh segment 22.

[0024] Example 3: Combination Figure 9 As shown, based on Embodiment 2, the mesh segment 22 is provided with a through hole 23.

[0025] Example 4: Combination Figure 9As shown, based on Embodiment 1, Embodiment 2 or Embodiment 3, one end of the nail rod 31 of the fixing pin 30 is provided with a conical nail tip 32, and the other end of the nail rod 31 is provided with a nail head 33.

[0026] Furthermore, the nail head 33 is provided with an arched surface 34 that is raised in an arc shape.

[0027] Example 5: Combination Figure 4-5 and Figure 9 As shown, based on Embodiment 4, a compression spring 40 is fitted on the nail rod 31. One end of the compression spring 40 abuts against the nail head 33, and the other end abuts against the outer periphery of the pin hole 14 at the bottom of the handle connecting section 12.

[0028] Example 6: Combination Figure 11-13 As shown, based on the above embodiment, it also includes a die 50. The outer periphery of the die 50 matches the countersunk hole 11 of the die, and at least one pair of positioning grooves 51 are provided on its outer periphery. Each pair of positioning grooves 51 is symmetrically distributed and their central axes are on the same straight line.

[0029] Furthermore, the number of positioning grooves 51 on the die 50 is two pairs, and the central axes of the two pairs of positioning grooves 51 are perpendicular to each other.

[0030] Combination Figure 14 As shown, after clamping the die 50 using the handle 20, the product has no screw holes or exposed screws, making it simple and aesthetically pleasing.

[0031] The above description is only a specific embodiment of the present invention, but the structural features of the present invention are not limited thereto. The present invention can be used in similar products. Any changes or modifications made by those skilled in the art within the scope of the present invention are covered by the patent scope of the present invention.

Claims

1. A die wrench which does not require locking screws, characterized in that: It includes a wrench body (10), two handles (20) and two fixing pins (30); The wrench body (10) is ring-shaped, with a countersunk hole (11) in the middle and handle connecting sections (12) on both sides. The handle connecting section (12) is provided with a handle mounting screw hole (13), and the bottom of the handle mounting screw hole (13) is provided with a pin hole (14) that connects to the countersunk hole (11). One end of the handle (20) is provided with a threaded section (21) that matches the handle mounting screw hole (13). The fixing pin (30) has a smooth pin shank (31) whose outline matches the pin hole (14).

2. A die wrench without locking screw according to claim 1, characterized in that: The other end of the handle (20) is provided with a mesh segment (22).

3. A die wrench that does not require a locking screw according to claim 2, characterized in that: The mesh segment (22) is provided with a through hole (23).

4. A die wrench that does not require a locking screw according to any one of claims 1-3, characterized in that: The fixing pin (30) has a conical tip (32) at one end of the pin shank (31).

5. A die wrench that does not require a locking screw according to claim 4, characterized in that: The other end of the pin shank (31) of the fixing pin (30) is provided with a pin cap (33).

6. A die wrench that does not require a locking screw according to claim 5, characterized in that: The nail head (33) is provided with an arched surface (34) that is raised in an arc shape.

7. A die wrench that does not require a locking screw according to claim 5, characterized in that: A compression spring (40) is fitted on the nail rod (31). One end of the compression spring (40) abuts against the nail head (33), and the other end abuts against the outer periphery of the pin hole (14) at the bottom of the handle connecting section (12).

8. A die wrench that does not require a locking screw according to claim 4, characterized in that: It also includes a die (50), the outer periphery of which matches the countersunk hole (11) of the die, and at least one pair of positioning grooves (51) are provided on its outer periphery. Each pair of positioning grooves (51) is symmetrically distributed and their central axes are on the same straight line.

9. A die wrench that does not require a locking screw according to claim 8, characterized in that: The number of positioning grooves (51) on the die (50) is two pairs, and the central axes of the two pairs of positioning grooves (51) are perpendicular to each other.

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