Dismounting wrench for nuts with damaged edges and corners

Abstract

The utility model provides a disassembling wrench for nuts with damaged edges and corners. The disassembling wrench comprises a telescopic handle, a clamping head, a tip, a spring and a screw. One end of the clamping head is provided with annular clamping teeth for clamping the outer wall of a nut to be disassembled, the other end of the clamping head is provided with a step through hole for installing the center and the telescopic handle, the center body is sleeved with a spring, the abutting end of the spring can stretch out of the step through hole to be wedged into the outer wall of the nut to be disassembled, the clamping head and the center are radially connected through a screw, and the screw stretches into a key groove in the side wall of the center. The telescopic handle is in threaded connection with the step through hole of the clamping head, the tip is wedged into the nut to be disassembled under screwing and pushing of the telescopic handle, then the telescopic handle is rotated in the nut loosening direction, and the nut can be disassembled. The dismounting wrench is simple in structure and high in dismounting efficiency, and does not damage other parts.

Description

Technical Field

[0001] This utility model belongs to the field of nut disassembly technology, specifically relating to a wrench for disassembling nuts with damaged edges. Background Technology

[0002] In various manufacturing industries, there are many components containing nuts, and the tightening of nuts is the most common method of fastening. Disassembling nuts is an essential step in component repair. Currently, the most common and prominent problem in nut repair is that damaged edges prevent the use of open-end wrenches for disassembly. Traditional methods for removing damaged nuts include welding, additive manufacturing, or manual chiseling. However, these methods are complex, inefficient, and yield poor results. This is especially true for some aircraft components, which contain other materials, grease, or precision components that are not resistant to the high temperatures of welding or the impacts of manual chiseling. Using traditional nut removal methods can damage these components. Utility Model Content

[0003] The purpose of this invention is to solve the problems of complex and inefficient processes in existing methods of disassembling nuts with damaged edges.

[0004] This addresses the issue of component damage and provides a wrench for removing nuts with sharp edges.

[0005] To achieve the above objectives, the technical solution provided by this utility model is as follows:

[0006] A wrench for removing nuts with damaged edges includes a telescopic handle, a clamp, a tip, a spring, and a screw. One end of the clamp has an annular clamping tooth, and the inner wall of the annular clamping tooth has several evenly distributed, center-facing interlocking teeth for clamping the sidewall of the nut to be removed. The maximum inner diameter of the annular clamping tooth is determined according to the diagonal dimension of the nut to be removed, and the axis of the annular clamping tooth is perpendicular to the axis of the clamp. The other end of the clamp has a cavity along the axis that communicates with the annular clamping tooth.

[0007] The tip is embedded in the cavity of the chuck, with the abutting end of the tip facing the annular chuck tooth, and can slide out of the cavity of the chuck along the axial direction of the chuck and wed into the side wall of the nut to be removed; the abutting end of the tip has a wedge-shaped structure.

[0008] The tip body has a keyway on its sidewall, and the locking head is radially connected to the tip body by the screw, with the end of the screw extending into the keyway.

[0009] The spring is fitted onto the body of the tip, and both ends of the spring are limited between the stepped surface of the chuck cavity and the stepped surface of the tip tail, for transmitting the working torque of the retractable handle to the tip when the retractable handle is working.

[0010] The retractable handle is threadedly connected to the cavity of the chuck. Under the twisting and feeding action of the retractable handle, the end of the retractable handle can abut against the end face of the tip, so that the pin of the tip wedges into the side wall of the nut to be disassembled.

[0011] Furthermore, the edge formed by the intersection of the two inclined surfaces of the wedge structure is perpendicular to the axis of the chuck head and parallel to the axis of the screw.

[0012] Furthermore, the card head includes a first end and a second end coaxially connected; the diameter of the first end gradually increases outward along the axial direction, the small diameter end of the first end is connected to the second end, and the diameter of the second end is equal to the diameter of the small diameter end of the first end;

[0013] The cavity of the chuck is a stepped through hole opened along the axis of the chuck starting from the end face of the second end. The stepped through hole includes a threaded hole and a cylindrical hole connected coaxially, and the diameter of the threaded hole is larger than the diameter of the cylindrical hole.

[0014] The tip body is located inside the stepped through hole, and the tip tail is located inside the threaded hole;

[0015] The threaded hole is connected to the retractable handle, and the length of the threaded hole must ensure that the tip of the abutment can extend out of the cylindrical hole and wedge into the side wall of the nut to be removed under the turning push of the retractable handle.

[0016] Furthermore, symmetrical horizontal surfaces are machined on both sides of the first end, and the annular retaining teeth are located on the horizontal surfaces; and screw mounting holes are formed on the horizontal surfaces near the annular retaining teeth for mounting the screws;

[0017] The outer wall of the first end is an arc surface that is smoothly connected to the outer wall of the second end.

[0018] Furthermore, the second end is provided with an inclined surface that connects to the horizontal surface of the first end, in order to prevent the outer wall of the chuck from interfering with the surface of other parts on the product during disassembly.

[0019] Furthermore, the retractable handle includes a threaded section and a handle portion coaxially connected; the diameter of the handle portion is equal to the diameter of the threaded section;

[0020] The outer wall of the threaded section is provided with an external thread that mates with the threaded hole of the chuck;

[0021] The handle portion has an internal hexagonal hole along its axis starting from the end face, which mates with the internal cubic wrench.

[0022] Furthermore, the outer wall of the handle is knurled and can be held and operated by the operator.

[0023] Furthermore, the clamp head material is selected as T10 and subjected to quenching treatment, and the hardness of the clamp head after quenching is not less than 58HRC.

[0024] The advantages of this utility model are:

[0025] 1. In this utility model, a clamping head with ring-shaped teeth is designed to hold the side wall of the nut to be disassembled. By rotating and pushing the retractable handle, the wedge-shaped tip of the nut is wedged into the side wall of the nut to be disassembled. Even if the edge of the nut is damaged, the nut can still be separated from the external threaded parts that are connected with it, thus achieving the disassembly of the nut without damaging other parts.

[0026] 2. The top of the nut in this utility model is designed as a wedge-shaped structure. This ensures the transmission of torque during nut disassembly and expands the circumference of the nut, creating a gap between the nut and the mating external threaded part. This reduces the torque transmitted to the mating external threaded part during nut disassembly, ensuring the efficiency of nut disassembly and protecting other parts from external forces to the greatest extent.

[0027] 3. This utility model has a simple structure, is easy to operate, and has high disassembly efficiency. Disassembling a nut using traditional methods takes about 1 hour, while using the disassembly wrench of this utility model, the nut can be disassembled in only about 6 minutes by simply clamping the wrench on the outer wall of the nut to be disassembled, turning it, and rotating the retractable handle in the direction of nut loosening. This increases efficiency by 5-10 times.

[0028] 4. The manufacturing cost of this utility model disassembly wrench is low, and it is convenient to use without being restricted by the location when repairing nuts. Attached Figure Description

[0029] Figure 1 This is a three-dimensional structural diagram of the present invention for disassembling a nut with damaged edges;

[0030] Figure 2 This is a schematic diagram of the retractable handle in this utility model;

[0031] Figure 3 This is the top front view of this utility model;

[0032] Figure 4 This is the top view of the entire utility model;

[0033] Figure 5 This is a schematic diagram of the spring structure in this utility model;

[0034] Figure 6 This is a diagram showing the connection between the disassembly wrench and the nut being removed;

[0035] Figure 7 yes Figure 6 A sectional view along the horizontal direction;

[0036] Figure 8 yes Figure 6 A sectional view along the vertical direction.

[0037] In the diagram: 1-Retractable handle, 2-Clip, 3-Point, 4-Spring, 5-Screw, 6-Nut, 7-External threaded part. Detailed Implementation

[0038] The embodiments of the present invention are described in detail below. These embodiments are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0039] To address the problem of disassembling nuts with damaged edges, this utility model provides a wrench for disassembling nuts with damaged edges, including a retractable handle 1, a clamp 2, a tip 3, a spring 4, and a screw 5. One end of the clamp 2 has an annular clamping tooth, with several evenly distributed, center-facing meshing teeth on its inner wall. The maximum inner diameter of the annular clamping tooth is determined according to the diagonal dimension of the nut to be disassembled. The annular clamping tooth is used to clamp the outer wall surface of the nut to be disassembled, increasing the contact area between the annular clamping tooth and the nut during disassembly and ensuring a better clamping effect. The other end of the clamp 2 has a threaded through hole along its axis, which communicates with the annular clamping tooth. The tip 3 is coaxially located within the threaded through hole, and a spring 4 is fitted onto the tip. The threaded end of the handle 1 engages with the threaded through hole of the clamp 2, and its end face abuts against the tail of the tip 3. The pin end of the tip 3 can extend out of the threaded through hole and wedge into the side wall of the nut to be disassembled under the pushing action of the handle 1. A keyway is formed on the side wall of the tip 3. The screw 5 radially connects the chuck 2 to the tip 3, with the end of the screw extending into the keyway. After clamping the nut to be disassembled with the chuck 2, rotate the retractable handle 1 to wedge the pin of the tip 3 into the side wall of the nut to transmit torque. Push the handle to disassemble the nut.

[0040] Refer to 1 and Figure 8 The clamping head 2 includes a first end and a second end coaxially connected. The diameter of the first end gradually increases outward along the axial direction. The smaller diameter end of the first end is connected to the second end and has the same diameter. Symmetrical horizontal surfaces are machined on both sides of the first end. Annular clamping teeth are radially formed on these horizontal surfaces along the first end. The inner wall of each annular clamping tooth has several evenly distributed, center-facing teeth. These annular clamping teeth are used to clamp the outer wall of the nut to be disassembled, increasing the contact area between the annular clamping teeth and the nut during disassembly and ensuring a better clamping effect. The maximum inner diameter of the annular clamping teeth is determined based on the diagonal dimension of the nut to be disassembled. Screw mounting holes are formed on the horizontal surface near the annular clamping teeth for mounting screws.

[0041] A stepped through hole is formed along the axis of the chuck starting from the end face of the second end. The stepped through hole communicates with the inner cavity of the annular chuck tooth, allowing the tip 3 to contact the side wall of the nut to be tested after passing through the stepped through hole. The stepped through hole includes a threaded hole and a cylindrical hole coaxially connected, and the diameter of the threaded hole is larger than the diameter of the cylindrical hole. The tip is installed in the stepped through hole, and the threaded hole mates with the threaded section of the retractable handle. The length of the threaded hole must ensure that the abutment of the tip can extend out of the cylindrical hole and wed into the side wall of the nut to be disassembled under the turning and pushing action of the retractable handle.

[0042] Furthermore, the outer wall of the first end is an arc surface that smoothly connects to the outer wall of the second end, enhancing the rigidity between the first and second ends and allowing the force of the retractable handle to be transmitted to the chuck head. The second end has a slope that connects to the horizontal plane of the first end, which is used to prevent the outer wall of the chuck head from interfering with the surface of other parts on the product during disassembly operations.

[0043] Based on the frequency of use of the chuck and the general materials of the nut, and considering the strength of the chuck, T10 material is selected for the chuck. Heat treatment: quenching, and the hardness of the chuck after quenching is ≥58HRC.

[0044] Reference Figure 2 , Figure 7 and Figure 8 The retractable handle 1 includes a threaded section and a handle portion coaxially connected, with the diameter of the handle portion equal to the diameter of the threaded section. The outer wall of the threaded section has an external thread that mates with the threaded hole of the chuck. The function of the retractable handle 1 is to rotate it so that the end of the threaded section contacts the tail of the tip 3, providing a forward thrust to the tip. The handle portion of the retractable handle 1 has an internal hexagonal hole along its axis from the end face, which mates with an internal hexagonal wrench. For harder materials, this allows for the use of an internal hexagonal wrench, increasing torque and providing a greater thrust to the tip, ensuring the tip wedges into the nut, making nut removal reliable and easy.

[0045] The outer wall of the handle is knurled to facilitate gripping and operation by the operator.

[0046] Reference Figure 3 and Figure 4 The tip 3 includes a coaxially connected tail and a ejector pin. The diameter of the tail is larger than the diameter of the cylindrical hole in the chuck 2 but smaller than the diameter of the threaded hole in the chuck, ensuring smooth movement of the tip within the chuck. The ejector pin is cylindrical in shape, with one end coaxially connected to the tail and the other end serving as a wedge-shaped abutment. The edge formed by the intersection of the two inclined surfaces of the wedge-shaped structure is perpendicular to the axis of the chuck and parallel to the axis of the screw.

[0047] A keyway is formed on the side wall of the tip, and the plane of the keyway is perpendicular to the inclined surface of the wedge-shaped structure. The screw 5 passes through the screw mounting hole on the chuck 2 and extends into the keyway to radially limit the tip, so that the tip can only move in a straight line along its axial direction when working, while ensuring that the inclined surface of the wedge-shaped structure of the tip does not change its spatial orientation relative to the wrench.

[0048] The wedge-shaped design of the ejector pin's end allows it to wedge into the nut body when the nut has damaged edges. This serves two purposes: first, to ensure the transmission of torque during nut disassembly; and second, to expand the nut's circumference, creating a gap between the nut and its mating external threaded part 7. This reduces the torque transmitted to the mating external threaded part during nut disassembly, ensuring efficient disassembly and maximizing the protection of other parts from external forces.

[0049] Reference Figure 5 and Figure 7 The spring 4 is a compression spring, which is fitted on the body of the tip 3, and the two ends of the spring 4 are limited between the outer step surface of the tip tail and the inner step surface of the chuck 2, so that the tip can move synchronously with the retractable handle 1 when the retractable handle is rotated.

[0050] Reference Figures 6-8 This diagram illustrates the interaction between the present invention's disassembly wrench and the nut during disassembly. In use, first, the annular teeth of the chuck are placed on the nut to be disassembled, so that the engaging teeth on the annular teeth press against the outer wall of the nut 6. Then, the retractable handle 1 is rotated until the threaded end face of the retractable handle 1 contacts the tail end face of the tip. Continuing to rotate the retractable handle 1 pushes the tip forward in a straight line, effectively wedging the tip's pin into the side wall of the nut 6. Finally, the retractable handle 1 is rotated in the direction of the force applied to loosen the nut, separating the threaded part 7 that mates with the nut 6.

[0051] The above description is only a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in this utility model, and these modifications or substitutions should all be covered within the protection scope of this utility model.

Claims

1. A wrench for removing nuts with damaged edges, characterized in that, The device includes a retractable handle, a clamping head, a tip, a spring, and a screw. One end of the clamping head is provided with an annular clamping tooth, and the inner wall of the annular clamping tooth is evenly distributed with several interlocking teeth facing the center for clamping the side wall of the nut to be removed. The maximum inner diameter of the annular clamping tooth is determined according to the diagonal dimension of the nut to be removed, and the axis of the annular clamping tooth is perpendicular to the axis of the clamping head. The other end of the clamping head is provided with a cavity communicating with the annular clamping tooth along the axis. The tip is embedded in the cavity of the chuck, with the abutting end of the tip facing the annular chuck tooth, and can slide out of the cavity of the chuck along the axial direction of the chuck and wed into the side wall of the nut to be removed; the abutting end of the tip has a wedge-shaped structure. The tip body has a keyway on its sidewall, and the locking head is radially connected to the tip body by the screw, with the end of the screw extending into the keyway. The spring is fitted onto the body of the tip, and both ends of the spring are limited between the stepped surface of the chuck cavity and the stepped surface of the tip tail, for transmitting the working torque of the retractable handle to the tip when the retractable handle is working. The retractable handle is threadedly connected to the cavity of the chuck. Under the twisting and feeding action of the retractable handle, the end of the retractable handle can abut against the end face of the tip, so that the pin of the tip wedges into the side wall of the nut to be disassembled.

2. The wrench for removing nuts with damaged edges according to claim 1, characterized in that, The edge formed by the intersection of the two inclined surfaces of the wedge structure is perpendicular to the axis of the chuck head and parallel to the axis of the screw.

3. The wrench for removing nuts with damaged edges according to claim 2, characterized in that, The chuck includes a first end and a second end coaxially connected; the diameter of the first end gradually increases outward along the axial direction, the small diameter end of the first end is connected to the second end, and the diameter of the second end is equal to the diameter of the small diameter end of the first end; The cavity of the chuck is a stepped through hole opened along the axis of the chuck starting from the end face of the second end. The stepped through hole includes a threaded hole and a cylindrical hole connected coaxially, and the diameter of the threaded hole is larger than the diameter of the cylindrical hole. The tip body is located inside the stepped through hole, and the tip tail is located inside the threaded hole; The threaded hole is connected to the retractable handle, and the length of the threaded hole must ensure that the tip of the abutment can extend out of the cylindrical hole and wedge into the side wall of the nut to be removed under the turning push of the retractable handle.

4. The wrench for removing nuts with damaged edges according to claim 3, characterized in that, The first end has symmetrical horizontal surfaces machined on both sides, and the annular retaining teeth are located on the horizontal surfaces; and screw mounting holes are formed on the horizontal surfaces near the annular retaining teeth for mounting the screws. The outer wall of the first end is an arc surface that is smoothly connected to the outer wall of the second end.

5. The wrench for removing nuts with damaged edges according to claim 4, characterized in that, The second end has an inclined surface that connects to the horizontal surface of the first end, which is used to prevent the outer wall of the chuck from interfering with the surface of other parts on the product during disassembly.

6. The wrench for removing nuts with damaged edges according to claim 3, characterized in that, The retractable handle includes a threaded section and a handle portion coaxially connected; the diameter of the handle portion is equal to the diameter of the threaded section. The outer wall of the threaded section is provided with an external thread that mates with the threaded hole of the chuck; The handle portion has an internal hexagonal hole along its axis starting from the end face, which mates with the internal cubic wrench.

7. The wrench for removing nuts with damaged edges according to claim 6, characterized in that, The outer wall of the handle is knurled and is held by the operator.

8. The wrench for removing nuts with damaged edges according to any one of claims 1-7, characterized in that, The chuck head is made of T10 material and undergoes quenching treatment. After quenching, the hardness of the chuck head is not less than 58HRC.

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