Folding knife with anti-loosening structure

Abstract

The utility model provides a folding knife with an anti-loosening structure. The folding knife comprises a first handle part, a second handle part, a knife main shaft, a main shaft screw, a knife main body and the anti-loosening structure, a through hole is formed in the first handle part, the main shaft screw is in threaded fit with the tool main shaft, the main shaft screw is provided with a cap part, the cap part is located on the side, away from the second handle part, of the first handle part, and a plurality of positioning grooves are formed in the cap part; the anti-loosening structure comprises an elastic piece and a positioning piece, the elastic piece is connected with the positioning piece, when the main shaft screw drives the cap part to press towards the first handle part, the positioning piece is in positioning fit with the corresponding positioning groove to limit rotation of the main shaft screw, and the elastic force of the elastic piece drives the positioning piece to press towards the positioning groove. According to the folding knife with the anti-loosening structure, the elastic piece of the anti-loosening structure is used for pressing the positioning piece into the positioning groove of the main shaft screw, so that the effect of positioning the main shaft screw is achieved when the main shaft screw is not completely tightened, the main shaft screw is prevented from rotating, and loosening of the main shaft screw is avoided.

Description

A folding knife with an anti-loosening structure Technical Field

[0001] This utility model relates to the field of cutting tool technology, specifically to a folding knife with an anti-loosening structure. Background Technology

[0002] Folding knives are characterized by their portability and practicality, making them one of the most frequently used tools in people's daily lives.

[0003] A folding knife typically includes two handles, a spindle screw on one handle, a tool spindle on the other handle, and a tool body that rotates with the tool spindle. By turning the spindle screw, the distance between the two handles can be adjusted, thereby adjusting the tightness of the rotation of the tool body.

[0004] Because the tool body needs to open and close smoothly, the spindle screw cannot be tightened. This leads to the spindle screw becoming loose over time. A loose connection between the spindle screw and the tool spindle can cause instability in the tool spindle, resulting in the tool body shaking. Common solutions include users adding threadlocker or frequently tightening the spindle screw to maintain the tightness of the spindle screw relative to the tool spindle. However, using threadlocker makes the maintenance and disassembly of the spindle screw more difficult, and frequently tightening the spindle screw is also troublesome. Summary of the Invention

[0005] The purpose of this invention is to overcome the shortcomings and deficiencies of the existing technology and provide a folding knife with an anti-loosening structure.

[0006] One embodiment of this utility model provides a folding knife with an anti-loosening structure, comprising: a first handle, a second handle, a knife spindle, a spindle screw, a knife body, and an anti-loosening structure;

[0007] The first shank has a through hole, the tool spindle is disposed on the second shank, the spindle screw passes through the through hole from the side of the first shank away from the second shank and then threadedly engages with the tool spindle, the spindle screw has a cap, the cap is located on the side of the first shank away from the second shank, the cap has a plurality of positioning grooves, the plurality of positioning grooves are arranged around the axis of the spindle screw and are arranged on the side of the cap facing the first shank, the tool body is disposed between the first shank and the second shank and is rotatably engaged with the tool spindle;

[0008] The anti-loosening structure includes an elastic element and a positioning element. The elastic element is connected to the positioning element. When the spindle screw drives the cap to press against the first shank, the positioning element extends into one of the positioning grooves. The positioning element and the corresponding positioning groove are positioned and engaged to restrict the rotation of the spindle screw. The elastic element generates elastic deformation, and the elastic force of the elastic element drives the positioning element to press against the positioning groove.

[0009] In some alternative implementations, the positioning element is a positioning bead.

[0010] In some alternative embodiments, the inner surface of the positioning groove is a curved surface that matches the surface of the positioning bead.

[0011] In some alternative implementations, the groove edges of adjacent positioning grooves are connected to each other.

[0012] In some alternative embodiments, the elastic element is a spring sheet, which is disposed within the through hole, and the positioning element is mounted on the spring sheet.

[0013] In some alternative embodiments, the spring is integrally formed with the first handle.

[0014] In some optional embodiments, a circumferential limiting portion is provided in the through hole, and a recess is formed on one side of the tool spindle. The tool spindle extends into the through hole, and the recess and the circumferential limiting portion cooperate to limit the circumferential rotation of the tool spindle.

[0015] In some alternative embodiments, the elastic element is disposed within the through hole, and the circumferential limiting portion is at least partially formed on the elastic element.

[0016] In some alternative embodiments, a support step is formed in the through hole, a notch is formed on the support step, the elastic element is arranged in the notch, and the cap of the spindle screw extends into the through hole and abuts against the support step.

[0017] Compared to existing technologies, the folding knife with an anti-loosening structure of this utility model uses the elastic element of the anti-loosening structure to press the positioning element into the positioning groove of the spindle screw, thereby positioning the spindle screw when it is not fully tightened, restricting the spindle screw from rotating and thus preventing the spindle screw from loosening. This allows the positioning element to move between the positioning grooves when the user actively turns the spindle screw, and also reduces friction and extends service life.

[0018] To provide a clearer understanding of this invention, the specific embodiments of this invention will be described below in conjunction with the accompanying drawings. Attached Figure Description

[0019] Figure 1 is a schematic diagram of a folding knife with an anti-loosening structure according to an embodiment of the present invention;

[0020] Figure 2 is an exploded view of a folding knife with an anti-loosening structure according to an embodiment of the present invention;

[0021] Figure 3 is a schematic diagram of the structure of the spindle screw according to an embodiment of the present invention;

[0022] Figure 4 is an enlarged view of point A shown in Figure 2;

[0023] Figure 5 is a cross-sectional view of a folding knife with an anti-loosening structure according to an embodiment of the present invention;

[0024] Figure 6 is an enlarged view of point B shown in Figure 5;

[0025] Figure 7 is a schematic diagram of the tool spindle structure according to an embodiment of the present invention.

[0026] Explanation of reference numerals in the attached figures:

[0027] 10. First shank; 11. Through hole; 12. Circumferential limiting part; 13. Support step part; 14. Notch part; 20. Second shank; 30. Tool spindle; 31. Recessed part; 40. Spindle screw; 41. Cap part; 42. Positioning groove; 50. Tool body; 60. Anti-loosening structure; 61. Elastic element; 62. Positioning element; Detailed Implementation

[0028] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Please refer to Figures 1 to 6. One embodiment of the present invention provides a folding knife with an anti-loosening structure 60, characterized in that it includes: a first handle 10, a second handle 20, a knife spindle 30, a spindle screw 40, a knife body 50, and an anti-loosening structure 60.

[0029] A through hole 11 is provided on the first shank 10. The tool spindle 30 is provided on the second shank 20. The spindle screw 40 passes through the through hole 11 from the side of the first shank 10 away from the second shank 20 and then threadedly engages with the tool spindle 30. The spindle screw 40 has a cap 41, which is located on the side of the first shank 10 away from the second shank 20. The cap 41 is provided with a plurality of positioning grooves 42, which are arranged around the axis of the spindle screw 40 and on the side of the cap 41 facing the first shank 10. The tool body 50 is provided between the first shank 10 and the second shank 20 and rotates with the tool spindle 30.

[0030] The anti-loosening structure 60 includes an elastic element 61 and a positioning element 62. The elastic element 61 is connected to the positioning element 62. When the spindle screw 40 drives the cap 41 to press against the first shank 10, the positioning element 62 extends into one of the positioning grooves 42. The positioning element 62 and the corresponding positioning groove 42 are positioned and engaged to restrict the rotation of the spindle screw 40. The elastic element 61 undergoes elastic deformation, and the elastic force of the elastic element 61 drives the positioning element 62 to press against the positioning groove 42.

[0031] The following explains the anti-loosening principle of a folding knife with an anti-loosening structure 60 according to an embodiment of the present invention:

[0032] First, assemble the first shank 10, the second shank 20, the tool spindle 30, and the tool body 50. Then, the spindle screw 40 passes through the through hole 11 from the side of the first shank 10 away from the second shank 20 and engages with the tool spindle 30. As the spindle screw 40 is continuously turned, the cap 41 of the spindle screw 40 gradually approaches the first shank 10 and then the positioning part 62. When the spindle screw 40 is roughly turned to the appropriate position, it is not fully tightened to prevent the first shank 10 from being excessively moved closer to the second shank 20 by the cap 41 of the spindle screw 40. The shank 20 makes the spindle screw 40 relatively easy to loosen at this point. As the spindle screw 40 approaches the appropriate position, the cap 41 of the spindle screw 40 will contact the positioning member 62. As the spindle screw 40 rotates, the positioning member 62 will continuously enter each positioning groove 42 until the spindle screw 40 reaches the appropriate position. At this point, the spindle screw 40 stops rotating, and the positioning member 62 engages with the nearest positioning groove 42. The positioning member 62 and the positioning groove 42 restrict the spindle screw 40 from rotating, thus achieving the positioning of the spindle screw 40. As for the elastic element 61, after the positioning element 62 contacts the cap 41 of the spindle screw 40, the positioning element 62 will be pressed towards the second shank 20 by the cap 41 of the spindle screw 40, causing the elastic element 61 to undergo elastic deformation. The elastic force of the elastic element 61 will drive the positioning element 62 to press against the cap 41 of the spindle screw 40. After the spindle screw 40 reaches the appropriate position, the elastic force of the elastic element 61 will make the positioning element 62 press firmly in the positioning groove 42, improving the stability of the positioning of the spindle screw 40. When it is necessary to adjust or remove the spindle screw 40, the user needs to apply sufficient force to rotate the spindle screw 40. Taking the adjustment of the spindle screw 40 as an example: when the user twists the spindle screw 40, sufficient torque needs to be applied to drive the spindle screw 40 to rotate. When the spindle screw 40 rotates, the positioning element 62 is pushed by the inner wall of the positioning groove 42, overcoming the elastic force of the elastic element 61 and disengaging from the current positioning groove 42 and moving into the adjacent positioning groove 42.

[0033] In some alternative embodiments, the positioning element 62 is a positioning bead with a curved surface, which helps to reduce friction between the positioning bead and the cap 41 of the spindle screw 40 when the positioning bead moves between the various positioning grooves 42.

[0034] In some alternative embodiments, the inner surface of the positioning groove 42 is a curved surface that matches the surface of the positioning bead, thereby reducing friction between the positioning bead and the cap 41 of the spindle screw 40 when the positioning bead moves between the positioning grooves 42. Moreover, when the positioning bead is positioned with the positioning groove 42, the surface of the positioning bead fits more closely with the inner surface of the positioning groove 42, improving the stability of the positioning fit.

[0035] In some alternative embodiments, the groove edges of adjacent positioning grooves 42 are connected to each other, that is, adjacent positioning grooves 42 are tightly attached to each other, and multiple positioning grooves 42 are arranged continuously. When the positioning member 62 disengages from the groove of the current positioning groove 42, it reaches the groove of the adjacent positioning groove 42 from the groove edge of the current positioning groove 42 and enters the adjacent positioning groove 42. Each positioning groove 42 can be positioned and engaged with the positioning member 62. Therefore, the number of positioning grooves 42 represents the number of angular positions that the spindle screw 40 can be positioned at. By arranging more and denser positioning grooves 42, the positioning member 62 can engage with the positioning grooves 42 to position the spindle screw 40 at more angular positions, and the spindle screw 40 can be positioned more accurately at the appropriate angle.

[0036] The specific structure of the elastic element 61 can be designed according to actual needs. For example, in some optional embodiments, the elastic element 61 is a spring sheet, which is disposed in the through hole 11. The positioning element 62 is mounted on the spring sheet. When the positioning element 62 is pressed by the cap 41 of the spindle screw 40, the positioning element 62 causes the spring sheet to bend, thereby realizing the elastic deformation of the spring sheet. Of course, the elastic element 61 can also be a spring, with both ends of the spring connected to the positioning element 62 and the first handle 10, respectively.

[0037] In some alternative implementations, the spring is integrally formed with the first handle 10, which helps to reduce the number of parts and reduce the difficulty of production and assembly.

[0038] Please refer to Figure 7. In some optional embodiments, a circumferential limiting part 12 is provided in the through hole 11, and a recessed part 31 is formed on one side of the tool spindle 30. The tool spindle 30 extends into the through hole 11, and the recessed part 31 and the circumferential limiting part 12 limit each other to restrict the circumferential rotation of the tool spindle 30, thereby preventing the tool spindle 30 from rotating relative to the first shank 10.

[0039] In some alternative embodiments, the elastic element 61 is arranged in the through hole 11, and the circumferential limiting part 12 is at least partially formed on the elastic element 61. By using the elastic element 61 to limit the circumferential rotation of the tool spindle 30, it is beneficial to improve the integration of the overall structure and make the design more ingenious.

[0040] In some alternative embodiments, a support step 13 is formed within the through hole 11, and a notch 14 is formed on the support step 13. An elastic member 61 is disposed in the notch 14. The head 41 of the spindle screw 40 can enter the through hole 11, extending into the through hole 11 and abutting against the support step 13. The notch 14 facilitates the positioning of the elastic member 61. The head 41 of the spindle screw 40 abuts against the support step 13, thereby pressing the first shank 10 against the second shank 20. The head 41 of the spindle screw 40 can be hidden within the through hole 11, improving aesthetics and enhancing the positional stability of the spindle screw 40 by utilizing the through hole 11, preventing the spindle screw 40 from shaking.

[0041] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A folding knife with an anti-loosening structure, characterized in that, include: The device comprises a first shank, a second shank, a tool spindle, a spindle screw, a tool body, and an anti-loosening structure. The first shank has a through hole. The tool spindle is disposed on the second shank. The spindle screw passes through the through hole from the side of the first shank away from the second shank and then threadedly engages with the tool spindle. The spindle screw has a cap located on the side of the first shank away from the second shank. The cap has multiple positioning grooves arranged around the axis of the spindle screw and on the side of the cap facing the first shank. The tool body is disposed between the first shank and the second shank and rotatably engages with the tool spindle. The anti-loosening structure includes an elastic element and a positioning element. The elastic element is connected to the positioning element. When the spindle screw pushes the cap against the first shank, the positioning element extends into one of the positioning grooves. The positioning element engages with the corresponding positioning groove to restrict the rotation of the spindle screw. The elastic element undergoes elastic deformation, and the elastic force of the elastic element drives the positioning element to press against the positioning groove.

2. A folding knife with an anti-loosening structure according to claim 1, characterized in that: The positioning element is a positioning bead.

3. A folding knife with an anti-loosening structure according to claim 2, characterized in that: The inner surface of the positioning groove is a curved surface that matches the surface of the positioning bead.

4. A folding knife with an anti-loosening structure according to claim 1, characterized in that: The edges of adjacent positioning grooves are connected to each other.

5. A folding knife with an anti-loosening structure according to claim 1, characterized in that: The elastic element is a spring sheet, which is disposed in the through hole, and the positioning element is mounted on the spring sheet.

6. A folding knife with an anti-loosening structure according to claim 5, characterized in that: The spring is integrally formed with the first handle.

7. A folding knife with an anti-loosening structure according to any one of claims 1 to 6, characterized in that: A circumferential limiting part is provided in the through hole, and a recess is formed on one side of the tool spindle. The tool spindle extends into the through hole, and the recess and the circumferential limiting part cooperate to limit the circumferential rotation of the tool spindle.

8. A folding knife with an anti-loosening structure according to claim 7, characterized in that: The elastic element is arranged in the through hole, and the circumferential limiting portion is at least partially formed on the elastic element.

9. A folding knife with an anti-loosening structure according to any one of claims 1 to 6, characterized in that: A support step is formed inside the through hole, and a notch is formed on the support step. The elastic element is arranged in the notch, and the cap of the spindle screw extends into the through hole and abuts against the support step.

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