Folding knife and spindle screw locking structure thereof

Abstract

The utility model provides a folding knife and a spindle screw anti-loosening structure thereof. The spindle screw anti-loosening structure of the folding knife comprises a first handle part, a spindle screw, a fixed disc and a threaded locking piece, a through hole is formed in the first handle part; the main shaft screw comprises a cap part, a limiting part and a stud which are connected in sequence, the cap part extends into the through hole and is rotationally matched with the through hole, and the limiting part abuts against the first handle part; the fixing disc abuts against the side, away from the first handle part, of the limiting part. The threaded locking piece is arranged on the first handle part and is in threaded fit with the fixing disc. Compared with the prior art, the spindle screw locking structure of the folding knife has the advantages that the spindle screw can be actively locked, and the mounting tightness of the spindle screw can be steplessly adjusted through the threaded locking piece and the fixing disc, so that the spindle screw is stably fixed and is not easy to loosen even if the spindle screw is used for a long time; and the connecting stability of the spindle screw and the cutter spindle is improved, the structure is simple, and operation is convenient.

Description

Technical Field

[0001] This utility model relates to the field of folding knife technology, specifically to a folding knife and its main shaft screw anti-loosening structure. Background Technology

[0002] Folding knives are easy to carry and highly practical, making them one of the most frequently used tools in people's daily lives.

[0003] A folding knife typically consists of two handles, a spindle screw on one handle, a spindle on the other handle, and a blade that rotates with the spindle. Tightening the spindle screw adjusts the distance between the two handles, thus adjusting the blade's rotation tightness. Because the blade needs to open and close smoothly, the spindle screw cannot be tightened completely. This leads to the spindle screw loosening over time. A loose connection between the spindle screw and the spindle causes spindle instability, resulting in blade wobbling. Common solutions include users applying threadlocker or frequently tightening the spindle screw slightly to maintain its tightness relative to the spindle. However, using threadlocker makes maintenance and disassembly of the spindle screw more difficult, and frequent tightening is inconvenient. Utility Model Content

[0004] The purpose of this utility model is to overcome the shortcomings and deficiencies in the existing technology and provide a folding knife and its main shaft screw anti-loosening structure.

[0005] One embodiment of this utility model provides a spindle screw anti-loosening structure for a folding knife, comprising: a first shank, a spindle screw, a fixing disc, and a threaded locking component;

[0006] A through hole is provided on the first handle;

[0007] The spindle screw includes a cap, a limiting part, and a stud connected in sequence. The cap extends into the through hole and rotates with the through hole. The limiting part abuts against the first shank.

[0008] The fixing plate is disposed on the first handle, and the fixing plate abuts against the side of the limiting portion away from the first handle;

[0009] The threaded locking member is disposed on the first handle and is threadedly engaged with the fixed plate. The threaded locking member can move closer to or further away from the fixed plate. When the threaded locking member is close to the fixed plate, it can press the limiting part onto the fixed plate.

[0010] In some alternative embodiments, the fixing plate is provided with a protruding pressing boss, and the fixing plate presses against the limiting part through the pressing boss.

[0011] In some optional embodiments, the first handle is provided with a first positioning groove communicating with the through hole. The first positioning groove and the through hole are respectively located on both sides of the first handle. The limiting part is positioned and engaged with the first positioning groove, and the first positioning groove restricts the position of the limiting part relative to the through hole in the radial direction.

[0012] In some alternative embodiments, the first handle is provided with a mounting hole, a notch is formed on one side of the mounting hole, the threaded locking member passes through the mounting hole and then engages with the fixed disc threadedly, a portion of the limiting portion is located at the notch, and the threaded locking member presses against the portion of the limiting portion located at the notch.

[0013] In some alternative embodiments, the first handle is provided with a mounting hole, a notch is formed on one side of the mounting hole, the threaded locking member passes through the mounting hole and then engages with the fixed disc threadedly, a portion of the limiting portion is located at the notch, the threaded locking member abuts against the portion of the limiting portion located at the notch, and the notch communicates with the first positioning groove.

[0014] In some alternative embodiments, the fixed plate is provided with a protruding pressing boss, the fixed plate presses against the limiting part through the pressing boss, the pressing boss extends into the first positioning groove and is positioned and engaged with the first positioning groove, the first positioning groove restricts the position of the pressing boss in the radial direction relative to the through hole.

[0015] In some alternative embodiments, a second positioning groove is provided on the first handle, and the fixed plate is positioned and engaged with the second positioning groove, the second positioning groove restricting the position of the fixed plate relative to the through hole in the radial direction.

[0016] In some optional embodiments, the fixed disk is provided with a plurality of circumferential positioning members arranged sequentially along the circumferential direction of the through hole. The circumferential positioning members are connected to the first handle portion and restrict the position of the fixed disk relative to the circumferential direction of the through hole.

[0017] In some alternative embodiments, the fixed plate is provided with guide posts for sliding engagement with the groove of the cutting tool.

[0018] In some alternative embodiments, the cross-section of the limiting portion is circular.

[0019] Another embodiment of this utility model provides a folding knife, including: a knife, a knife spindle, a second shank, and a spindle screw anti-loosening structure as described above. The knife spindle is disposed on the second shank, and the spindle screw is threadedly engaged with the knife spindle. The knife is arranged between the first shank and the second shank and is rotatably engaged with the knife spindle.

[0020] Compared to existing technologies, the anti-loosening structure of the spindle screw of this utility model can actively lock the spindle screw. Through the cooperation of the threaded locking part and the fixed plate, the tightness of the spindle screw installation can be infinitely adjusted, thereby stabilizing and fixing the spindle screw. Even with long-term use, the spindle screw is not easy to loosen, which improves the stability of the connection between the spindle screw and the tool spindle. Moreover, the tools for adjusting the tightness of the spindle screw and adjusting the threaded locking part can be shared, so no additional tools are required. The structure is simple and easy to operate.

[0021] 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

[0022] Figure 1 This is a schematic diagram of the structure of a folding knife according to an embodiment of the present invention;

[0023] Figure 2 This is an exploded view of a folding knife according to an embodiment of the present invention;

[0024] Figure 3 This is a cross-sectional view of the anti-loosening structure of the spindle screw of a folding knife according to an embodiment of the present invention;

[0025] Figure 4 This is an exploded view of the anti-loosening structure of the spindle screw of a folding knife according to an embodiment of the present invention;

[0026] Figure 5 This is a schematic diagram of the structure of the first handle in one embodiment of the present utility model;

[0027] Figure 6 This is a schematic diagram of the anti-loosening structure of the spindle screw of a folding knife according to an embodiment of the present invention.

[0028] Explanation of reference numerals in the attached figures:

[0029] 10. First handle; 11. Through hole; 12. Mounting hole; 121. Notch; 13. First positioning groove; 14. Second positioning groove;

[0030] 20. Spindle screw; 21. Cap; 22. Limiting part; 23. Stud;

[0031] 30. Fixed plate; 31. Pressing boss; 32. Circumferential positioning component;

[0032] 40. Threaded locking components;

[0033] 50. Knives;

[0034] 60. Tool spindle;

[0035] 70. Second handle. Detailed Implementation

[0036] The technical solutions of the present invention will now be clearly and completely described with reference to the accompanying drawings of the embodiments thereof. Please refer to... Figure 1 and Figure 2 One embodiment of this utility model provides a folding knife including: a main shaft screw anti-loosening structure for the folding knife, a cutting tool 50, a cutting tool main shaft 60, and a second handle 70.

[0037] Please see Figures 1 to 4 The anti-loosening structure of the folding knife's main spindle screw includes: a first handle 10, a main spindle screw 20, a fixed disc 30, and a threaded locking component 40;

[0038] A through hole 11 is provided on the first handle 10;

[0039] The spindle screw 20 includes a cap 21, a limiting part 22 and a stud 23 connected in sequence. The cap 21 extends into the through hole 11 and rotates with the through hole 11. The limiting part 22 abuts against the first shank 10.

[0040] The fixing plate 30 is disposed on the first handle 10, and the fixing plate 30 abuts against the side of the limiting part 22 away from the first handle 10;

[0041] The threaded locking member 40 is disposed on the first handle 10 and is threadedly engaged with the fixed plate 30. The fixed plate 30 can move closer to or away from the first handle 10 under the drive of the threaded locking member. When the fixed plate 30 moves closer to the first handle 10, it can press the limiting part 22 onto the first handle 10.

[0042] The tool spindle 60 is mounted on the second shank 70. The spindle screw 20 is threadedly engaged with the tool spindle 60. The tool 50 is arranged between the first shank 10 and the second shank 70 and rotates with the tool spindle 60.

[0043] By turning the threaded locking element 40, its position can be infinitely adjusted, thereby adjusting the tightness of the spindle screw 20. The spindle screw 20 can be stably locked or loosened to release its lock. Then, the spindle screw 20 can be easily turned to adjust the tightness of its connection with the tool spindle 60, thus adjusting the smoothness of the tool 50's movement. Because the active locking of the spindle screw 20 is achieved through the cooperation of the threaded locking element 40 and the fixed plate 30, the spindle screw 20 is not easily loosened even after long-term use, improving the stability of the connection between the spindle screw 20 and the tool spindle 60. Furthermore, the tools used to adjust the tightness of the spindle screw 20 and the threaded locking element 40 are interchangeable; for example, a screwdriver can be used for both. Therefore, no additional tools are required, resulting in a simple structure and convenient operation.

[0044] The through hole 11 is located on the side of the first shank 10 away from the second shank 70. The cap 21 of the spindle screw 20 is located inside the through hole 11, which allows the tool to rotate the cap 21 to adjust the spindle screw 20 and the tool spindle 60.

[0045] In some optional embodiments, the fixed disk 30 is provided with a protruding pressing boss 31. The fixed disk 30 presses against the limiting part 22 through the pressing boss 31. The protruding pressing boss 31 can prevent the part of the fixed disk 30 other than the pressing boss 31 from contacting other structures of the first handle 10, which would cause the fastening force of the threaded locking member 40 to be uneven. The pressing boss 31 on the fixed disk 30 presses the limiting part 22 as close as possible to the threaded locking member 40, so that the fastening force of the threaded locking member 40 is concentrated on the limiting part 22, thereby improving the pressing stability.

[0046] Please see Figure 3 and Figure 5 In some optional embodiments, the first shank 10 is provided with a first positioning groove 13 communicating with the through hole 11. The first positioning groove 13 and the through hole 11 are respectively located on both sides of the first shank 10. The limiting part 22 is positioned and engaged with the first positioning groove 13. The first positioning groove 13 restricts the position of the limiting part 22 in the radial direction relative to the through hole 11, so that the limiting part 22 is stably installed. The limiting part 22 can rotate relative to the first positioning groove 13 and move in the axial direction relative to the through hole 11, so that the spindle screw 20 can be more stable when adjusting the tightness relative to the tool spindle 60.

[0047] In some alternative embodiments, the pressing boss 31 extends into the first positioning groove 13 and is positioned and engaged with the first positioning groove 13. The first positioning groove 13 restricts the position of the pressing boss 31 in the radial direction relative to the through hole 11, which helps to improve the positional stability of the pressing boss 31.

[0048] Please see Figure 5In some optional embodiments, a mounting hole 12 is provided on the first handle 10, and a notch 121 is formed on one side of the mounting hole 12. The threaded locking member 40 passes through the mounting hole 12 and then engages with the fixed plate 30 by threads. A portion of the limiting part 22 is located at the notch 121, and the threaded locking member 40 presses against the portion of the limiting part 22 located at the notch 121, thereby facilitating the threaded locking member 40 to press against the limiting part 22. In this embodiment, the notch 121 communicates with the first positioning groove 13.

[0049] In some alternative embodiments, the limiting part 22 has a circular cross-section, which facilitates the rotation of the limiting part 22 within the first positioning groove 13.

[0050] In some optional embodiments, a second positioning groove 14 is provided on the first handle 10, and the fixed disk 30 is positioned and engaged with the second positioning groove 14. The second positioning groove 14 restricts the radial position of the fixed disk 30 relative to the through hole 11, which helps to improve the positional stability of the fixed disk 30. In this embodiment, the notch 121 communicates with the second positioning groove 14.

[0051] Please see Figure 6 In some optional embodiments, the fixed disk 30 is provided with a plurality of circumferential positioning members 32 arranged sequentially along the circumferential direction of the through hole 11. The circumferential positioning members 32 are connected to the first handle 10. The circumferential positioning members 32 are used to limit the position of the fixed disk 30 relative to the through hole 11 in the circumferential direction. The circumferential positioning members 32 prevent the fixed disk 30 from rotating relative to the first handle 10, thereby improving the positional stability of the fixed disk 30. The circumferential positioning members 32 can also be locked to make the fixed disk 30 stably fixed.

[0052] The installation method of the circumferential positioning component 32 can be selected according to actual needs. For example, the circumferential positioning component 32 can pass through the fixed plate 30 and then be threaded into the first shank 10. This example is not limited to this one.

[0053] 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 structure for preventing loosening of the spindle screw of a folding knife, characterized in that, include: First shank, main spindle screw, fixed plate and threaded locking parts; A through hole is provided on the first handle; The spindle screw includes a cap, a limiting part, and a stud connected in sequence. The cap extends into the through hole and rotates with the through hole. The limiting part abuts against the first shank. The fixing plate is disposed on the first handle, and the fixing plate abuts against the side of the limiting portion away from the first handle; The threaded locking member is disposed on the first handle and is threadedly engaged with the fixed plate. The threaded locking member can move closer to or further away from the fixed plate. When the threaded locking member is close to the fixed plate, it can press the limiting part onto the fixed plate.

2. The anti-loosening structure for the spindle screw of a folding knife according to claim 1, characterized in that: The fixed plate is provided with a protruding pressing boss, and the fixed plate presses against the limiting part through the pressing boss.

3. The anti-loosening structure for the spindle screw of a folding knife according to claim 1, characterized in that: The first handle is provided with a first positioning groove that communicates with the through hole. The first positioning groove and the through hole are respectively located on both sides of the first handle. The limiting part is positioned and engaged with the first positioning groove. The first positioning groove restricts the position of the limiting part relative to the through hole in the radial direction.

4. The anti-loosening structure for the spindle screw of a folding knife according to claim 1, characterized in that: The first handle is provided with a mounting hole, and a notch is formed on one side of the mounting hole. The threaded locking member passes through the mounting hole and then engages with the fixed disc threadedly. A portion of the limiting part is located at the notch, and the threaded locking member presses against the portion of the limiting part located at the notch.

5. The anti-loosening structure for the spindle screw of a folding knife according to claim 3, characterized in that: The first handle is provided with a mounting hole, and a notch is formed on one side of the mounting hole. The threaded locking member passes through the mounting hole and then engages with the fixed disc threadedly. A portion of the limiting part is located at the notch, and the threaded locking member presses against the portion of the limiting part located at the notch. The notch communicates with the first positioning groove.

6. The anti-loosening structure for the spindle screw of a folding knife according to claim 3, characterized in that: The fixed plate is provided with a protruding pressing boss. The fixed plate presses against the limiting part through the pressing boss. The pressing boss extends into the first positioning groove and is positioned and cooperates with the first positioning groove. The first positioning groove restricts the position of the pressing boss relative to the radial direction of the through hole.

7. The anti-loosening structure for the spindle screw of a folding knife according to claim 3, characterized in that: The limiting part has a circular cross-section, and the first positioning groove matches the limiting part.

8. A spindle screw anti-loosening structure for a folding knife according to any one of claims 1 to 7, characterized in that: The first handle is provided with a second positioning groove, and the fixed plate is positioned and engaged with the second positioning groove. The second positioning groove restricts the position of the fixed plate relative to the through hole in the radial direction.

9. A spindle screw anti-loosening structure for a folding knife according to any one of claims 1 to 7, characterized in that: The fixed disk is provided with a plurality of circumferential positioning members arranged sequentially along the circumferential direction of the through hole. The circumferential positioning members are connected to the first handle and restrict the position of the fixed disk relative to the circumferential direction of the through hole.

10. A folding knife, characterized in that, include: The tool, the tool spindle, the second shank, and the spindle screw anti-loosening structure of a folding knife as described in any one of claims 1 to 9, wherein the tool spindle is disposed on the second shank, the spindle screw is threadedly engaged with the tool spindle, and the tool is arranged between the first shank and the second shank and is rotatably engaged with the tool spindle.

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