Anti-loosening structure for preventing screw loosening of folding knife

Abstract

The utility model discloses an anti-loosening structure for preventing a screw from loosening for a folding knife, and relates to the technical field of folding knives. The folding knife comprises handles, a blade, a knife shaft and a locking screw, shaft holes are oppositely formed in the two handles, the knife shaft sequentially penetrates through the two shaft holes, the locking screw and the knife shaft are fixed to be used for limiting the knife shaft on the handles, the blade is rotationally assembled between the two handles through the knife shaft, and an anti-loosening structure used for preventing the locking screw from loosening is arranged on the folding knife. The anti-loosening structure comprises a locking piece which is arranged at the end of the cutter shaft in a sleeving mode and is static relative to the cutter shaft. And the retainer is arranged on the handle and is used for being matched with the locking piece to prevent the cutter shaft from driving the locking piece to rotate relative to the handle. By adopting the technical scheme, the folding knife has the advantages that the folding knife is convenient to disassemble, and meanwhile, the locking screw on the knife shaft can be prevented from loosening, so that the structure of the folding knife is more stable, and potential safety hazards are reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of folding knives, in particular to an anti-loosening structure of a folding knife for preventing a screw from loosening. Background Art

[0002] Usually, in order to facilitate disassembly and debugging, the blade of a folding knife is usually installed by connecting the knife shaft and the handle with screws. In order to prevent the knife shaft and the blade from rotating at the same time, the handle shaft hole is set as a D-shaped hole, and the knife shaft and the corresponding shaft hole are set as D-shaped.

[0003] At the same time, in order to prevent the screw from loosening, the surface of the screw thread is coated with thread anti-loosening glue. However, after multiple disassembly, the anti-loosening glue of the screw loses its anti-loosening ability. The knife shaft and the handle shaft hole are clearance-matched. After opening and closing the blade many times, the knife shaft swings or shakes slightly in the handle shaft hole under the action of the blade. The swing or shaking of the knife shaft in the handle shaft hole makes the screw easy to loosen, affecting the user experience and easily causing structural instability and safety hazards. Utility Model Content

[0004] In order to overcome at least one defect of the above-mentioned prior art, the utility model provides an anti-loosening structure of a folding knife to prevent the screw from loosening. The utility model has the advantages of being easy to disassemble and preventing the locking screw on the knife shaft from loosening, thereby making the structure of the folding knife more stable and reducing safety hazards.

[0005] To achieve the above-mentioned purpose, the technical solution adopted by the utility model is: an anti-loosening structure of a folding knife for preventing a screw from loosening, the folding knife comprises a handle, a blade, a knife shaft and a locking screw, two handles are oppositely provided with axial holes, the knife shaft is sequentially penetrated by two axial holes, the locking screw is fixed to the knife shaft for limiting the knife shaft on the handles, the blade is rotatably assembled between the two handles through the knife shaft, the folding knife is provided with an anti-loosening structure for preventing the locking screw from loosening, the anti-loosening structure comprises: a locking member sleeved on the end of the knife shaft and stationary relative to the knife shaft; and a stopper provided on the handle for cooperating with the locking member to prevent the knife shaft from driving the locking member to rotate relative to the handle.

[0006] Optionally, at least two protruding teeth are provided on the outer side wall of the locking member, and a groove is provided between two adjacent protruding teeth.

[0007] Optionally, a receiving groove is provided in the handle on one side of the shaft hole, the stopper is provided in the receiving groove, and the locking member is provided in the receiving groove and abuts against the stopper.

[0008] Optionally, the stopper is at least one limiting protrusion integrally provided on the side wall of the accommodating groove and capable of being plugged one-to-one with the groove.

[0009] Optionally, the stopper is a limit screw fixed on the handle and located in the accommodating groove, and the screw head of the limit screw is a conical surface that can abut against the groove.

[0010] Optionally, the stopper is at least two soft columns arranged in the accommodating groove, the locking member is surrounded by the soft columns, and the soft columns can be squeezed into the groove.

[0011] Optionally, the stopper is an anti-loosening ring disposed in the accommodating groove and sleeved outside the locking member, and the anti-loosening ring is respectively abutted against the inner side wall of the accommodating groove and the outer side wall of the locking member.

[0012] Optionally, the locking member is in the shape of a spline tooth.

[0013] The handle comprises a handle body and a lining which are arranged in sequence from outside to inside; the lining is embedded in one side of the handle body, the anti-loosening structure is located between the handle body and the lining, and the locking member is limited outside the shaft hole.

[0014] The locking piece is arranged on one end of the knife shaft, and a limiting portion with a diameter larger than the shaft hole is arranged on the end of the knife shaft away from the locking piece. The limiting portion is located between the handle body of one of the handles and the lining, and an avoidance groove for accommodating the limiting portion is arranged on one side of the handle body.

[0015] After adopting the above technical scheme, the utility model has the following beneficial effects: the folding knife is provided with an anti-loosening structure for preventing the locking screw from loosening, and the anti-loosening structure includes: a locking member and a stopper, the locking member is sleeved on the end of the knife shaft and is stationary relative to the knife shaft. The stopper is provided on the handle, and the stopper is used to cooperate with the locking member to prevent the knife shaft from driving the locking member to rotate relative to the handle. Specifically, at least two convex teeth are provided on the outer wall of the locking member, and a groove is provided between two adjacent convex teeth. A receiving groove is provided on one side of the shaft hole in the handle, and the stopper is provided in the receiving groove. The locking member is provided in the receiving groove and abuts against the stopper to reduce the rotation of the locking member relative to the knife handle under the action of the knife shaft, thereby reducing the loosening of the locking screw fixing the knife handle and the knife shaft, thereby making the structure of the folding knife more stable to reduce safety hazards. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0017] Figure 1 It is a structural schematic diagram of the utility model;

[0018] Figure 2 is an exploded schematic diagram of Example 1;

[0019] Figure 3 is an exploded schematic diagram of Embodiment 1 in another direction;

[0020] Figure 4 is an exploded schematic diagram of Example 2;

[0021] Figure 5 is a schematic structural diagram of a handle body of Example 2;

[0022] Figure 6 is an exploded schematic diagram of Example 3;

[0023] Figure 7 is an explosion diagram of Example 4;

[0024] Figure 8 This is a cross-sectional view of Example 4.

[0025] Explanation of the reference numerals: 1. handle; 11. handle body; 12. lining; 2. blade; 3. blade shaft; 31. limiting part; 4. locking screw; a. shaft hole; 5. locking member; 51. convex tooth; 6. stop member; 61. limiting protrusion; 62. limiting screw; 63. soft column; 64. anti-loosening soft ring; b. receiving groove; 7. fixing screw; 8. gasket; c. slot. DETAILED DESCRIPTION

[0026] The utility model is further described in detail below in conjunction with the accompanying drawings.

[0027] This specific embodiment is merely an explanation of the present invention and is not a limitation of the present invention. After reading this specification, those skilled in the art may make non-creative modifications to the present embodiment as needed, but such modifications are protected by patent law as long as they are within the scope of the claims of the present invention.

[0028] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0029] It should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0030] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of some utility models, "plurality" means two or more, unless otherwise clearly and specifically defined.

[0031] Embodiment 1:

[0032] This embodiment relates to a folding knife anti-loosening structure for preventing a screw from loosening, such as Figure 1-8 As shown, the folding knife includes a handle 1, a blade 2, a knife shaft 3 and a locking screw 4. The two handles 1 are provided with axial holes a in opposite directions. The knife shaft 3 is provided with two axial holes a in sequence. The knife shaft 3 and the axial hole a are in clearance fit. The locking screw 4 is fixed to the knife shaft 3 to limit the knife shaft 3 on the handle 1. The blade 2 is rotatably assembled between the two handles 1 through the knife shaft 3. A fixing member for fixing the two handles 1 is provided on the folding knife away from the knife shaft 3. The fixing member can be a fixing screw 7. The folding knife is provided with an anti-loosening structure for preventing the locking screw 4 from loosening. The anti-loosening structure includes: a locking member 5 and a stopper 6. The locking member 5 is sleeved on the end of the knife shaft 3 and is stationary relative to the knife shaft 3. The stopper 6 is provided on the handle 1. The stopper 6 is used to cooperate with the locking member 5 to prevent the knife shaft 3 from driving the locking member 5 to rotate relative to the handle 1. In this embodiment, the axial hole a is a D-shaped hole, and the knife shaft 3 is a D-shaped shaft adapted to the D-shaped hole. The knife shaft 3 and the axial hole a are in clearance fit. Optionally, the mounting hole for the locking member 5 to cooperate with the end of the blade shaft 3 may be a D-shaped hole adapted to the blade shaft 3 .

[0033] Optionally, at least two protruding teeth 51 are provided on the outer side wall of the locking member 5, and a groove is provided between two adjacent protruding teeth 51. The locking member 5 may be in the shape of a spline tooth but is not limited to the spline tooth shape.

[0034] Optionally, in order to make the folding knife more beautiful and avoid the locking member 5 from being exposed, a receiving groove b is provided in the handle 1 on one side of the axial hole a, and the stop member 6 is provided in the receiving groove b, and the locking member 5 is provided in the receiving groove b and abuts against the stop member 6 to reduce the rotation of the locking member 5 relative to the knife handle under the action of the knife shaft 3, thereby reducing the loosening of the locking screw 4 that fixes the knife handle and the knife shaft 3.

[0035] It should be noted that, in order to prevent the anti-loosening structure from detaching from the handle 1, in this embodiment, the handle 1 includes a handle 1 body and a lining 12 arranged in sequence from the outside to the inside. The lining 12 is embedded in one side of the handle 1 body, and the anti-loosening structure is located between the handle 1 body and the lining 12. The size of the locking member 5 is larger than the size of the shaft hole a, and the locking member 5 is limited outside the shaft hole a and is located away from the blade 2. Further, the shaft hole a is penetrated on the lining 12, and the receiving groove b is provided on one side of the handle 1 body. Specifically, a placement groove for accommodating the lining 12 is provided on one side of the handle 1 body, and the lining 12 can be fixed in the placement groove of the handle 1 body by screws, and the accommodating groove b is provided in the placement groove.

[0036] Optional, such as Figure 2 , 3 As shown, the stopper 6 is at least one limiting protrusion 61 integrally provided on the side wall of the receiving groove b and capable of being plugged into the groove one by one. In this embodiment, two limiting protrusions 61 are provided at intervals, but not limited to two.

[0037] In this embodiment, in order to facilitate the disassembly of the knife shaft 3, the blade 2 and the handle of the folding knife, and to facilitate the user to adjust or repair the folding knife. An anti-loosening structure is provided, and a locking member 5 is provided on one end of the knife shaft 3, and the locking member 5 is detachably assembled with one end of the knife shaft 3. Optionally, a limiting portion 31 with a diameter larger than the shaft hole a is provided on the end of the knife shaft 3 away from the locking member 5, and the limiting portion 31 is located between the handle 1 body of one of the handles 1 and the lining 12, and a side of the handle 1 body is provided with an avoidance groove for accommodating the limiting portion 31. Optionally, the end of the knife shaft 3 away from the locking member 5 is equal to or smaller than the diameter of the knife shaft 3.

[0038] In some embodiments, an anti-loosening structure is provided with a locking member 5 of the anti-loosening structure which is integrally provided at one end of the blade shaft 3 , and the end of the blade shaft 3 away from the locking member 5 is equal to or smaller than the diameter of the blade shaft 3 .

[0039] In some embodiments, two anti-loosening structures are relatively arranged, and the locking members 5 of the two anti-loosening structures are detachably assembled with the two ends of the knife shaft 3 respectively.

[0040] Optionally, a gasket 8 is sleeved on the knife shaft 3, and the gasket 8 is located between the blade 2 and the lining 12. This makes the structure of the folding knife more compact, prevents the knife shaft 3 from moving left and right in the shaft hole a, and prevents the blade 2 from directly contacting the lining 12, thereby reducing the contact area of ​​the side wall of the blade 2 and reducing the friction, making the opening or storage of the blade 2 smoother.

[0041] When the anti-loosening structure is installed on the folding knife, the end of the knife shaft 3 away from the limiting portion 31 is penetrated with an axial hole a of a lining 12, a gasket 8, a blade 2, another gasket 8, and an axial hole a of another lining 12 in sequence, so that the limiting portion 31 is limited outside the gasket 8, and then the locking piece 5 is sleeved on the end of the knife shaft 3 away from the limiting portion 31, and then a handle 1 body is covered on the lining 12, so that the accommodating groove b on the handle 1 body is covered outside the locking piece 5, and then the handle 1 body is slightly rotated so that the limiting protrusion 61 on the inner side wall of the accommodating groove b is plugged and engaged with the groove on the locking piece 5, and then the locking screw 4 is penetrated through the screw holes on the handle 1 and the knife shaft 3 and tightened to fix, and then another handle 1 body is covered on another lining 12, and then another locking screw 4 is used to fix the end of the knife shaft 3 close to the limiting portion 31. Thus, the handle 1 is assembled and fixed with the knife shaft 3 and the blade 2, and the anti-loosening structure is installed on the folding knife, which is convenient for assembly and disassembly. Under the action of the limiting protrusion 61, the locking member 5 cannot rotate, and the locking member 5 cannot rotate, which drives the knife shaft 3 to be unable to rotate in the shaft hole a, so as to prevent the locking screw 4 from loosening. The above assembly sequence is not the only assembly sequence of this embodiment, and the operator can adjust the assembly sequence of the parts according to habit.

[0042] Embodiment 2:

[0043] The main difference between this embodiment and embodiment 1 is that Figure 4 , 5 As shown, the stopper 6 is a limit screw 62 fixed on the handle 1 and located in the receiving groove b. The limit screw 62 is fixed on the bottom surface of the receiving groove b. The screw head of the limit screw 62 is a conical surface that can abut against the groove. In this embodiment, one limit screw 62 is provided. Optionally, the limit screw 62 is fixed on the lining 12 and placed in the receiving groove b.

[0044] During assembly, first install the knife shaft 3, lining 12, gasket 8, blade 2, gasket 8, lining 12 and locking piece 5 in sequence, tighten the limit screw to the side of the lining 12 away from the blade 2, the screw head of the limit screw is provided with a conical surface, and the conical screw head and the groove of the locking piece 5 are guided and engaged to prevent the screw of the knife shaft 3 from loosening, and then the handle 1 body is covered outside the lining 12 so that the accommodating groove b covers the limit screw 62 and the locking piece 5 inside, and then the handle 1 body and the end of the knife shaft 3 are fixed by the locking screw 4, thereby completing the installation of the anti-loosening structure.

[0045] Embodiment 3:

[0046] The main difference between this embodiment and Embodiment 1 and Embodiment 2 is that Figure 6 As shown, the stopper 6 is at least two soft columns 63 disposed in the receiving groove b, and the locking member 5 is surrounded by the soft columns 63, and the soft columns 63 can be squeezed into the groove. In this embodiment, two soft columns 63 are symmetrically arranged, and the two soft columns 63 are respectively located on both sides of the locking member 5. The soft columns 63 and the locking member 5 are both located in the receiving groove b of the handle 1 body, and the two ends of the soft column 63 are respectively connected to the handle 1 body and the lining 12.

[0047] During assembly, first install the soft column 63 into the corresponding installation position in the receiving groove b of the handle 1 body, and then install the knife shaft 3, lining 12, gasket 8, blade 2, gasket 8, lining 12 in turn, and the handle 1 body with the soft column 63 installed, and then install another handle 1 body. The soft column 63 and the locking piece 5 are squeezed against each other to generate friction, thereby achieving the purpose of preventing the screws of the knife shaft 3 from loosening.

[0048] Embodiment 4:

[0049] The main differences between this embodiment and Embodiment 1, Embodiment 2 and Embodiment 3 are as follows: Figure 7 , 8 As shown, the stopper 6 is an anti-loosening ring 64 disposed in the receiving groove b and sleeved outside the locking member 5, and the anti-loosening ring 64 respectively abuts against the inner side wall of the receiving groove b and the outer side wall of the locking member 5. Preferably, in order to stably install the anti-loosening ring 64 in the receiving groove b, an annular clamping groove c for clamping the anti-loosening ring 64 is provided on the inner side wall of the receiving groove b. The receiving groove b and the annular clamping groove c are both provided on the body of the handle 1.

[0050] During assembly, the anti-loosening soft ring 64 is installed into the slot c of the handle 1 body, and then the knife shaft 3, lining 12, gasket 8, blade 2, gasket 8, lining 12, locking piece 5, and handle 1 body are installed in sequence, and then fixed by locking screw 4. When the anti-loosening soft ring 64 is pressed into the toothed nut, the soft ring and the inner wall of the accommodating groove b generate friction under the action of locking piece 5, thereby achieving the purpose of preventing the screw of the knife shaft 3 from loosening.

[0051] The above is only used to illustrate the technical solution of the utility model rather than to limit it. Other modifications or equivalent substitutions made to the technical solution of the utility model by ordinary technicians in this field should be included in the scope of the claims of the utility model as long as they do not depart from the spirit and scope of the technical solution of the utility model.

Claims

1. A folding knife anti-loosening structure for preventing a screw from loosening, the folding knife comprising a handle (1), a blade (2), a knife shaft (3) and a locking screw (4), two handles (1) are provided with axial holes (a) opposite to each other, the knife shaft (3) is sequentially penetrated with two axial holes (a), the locking screw (4) is fixed to the knife shaft (3) for limiting the position of the knife shaft (3) on the handle (1), the blade (2) is rotatably assembled between the two handles (1) through the knife shaft (3), and the characteristics are as follows: The folding knife is provided with an anti-loosening structure for preventing the locking screw (4) from loosening, the anti-loosening structure comprising: a locking member (5) sleeved on the end of the knife shaft (3) and stationary relative to the knife shaft (3); and, A stopper (6) disposed on the handle (1) and used to cooperate with the locking member (5) to prevent the knife shaft (3) from driving the locking member (5) to rotate relative to the handle (1).

2. The anti-loosening structure for preventing screws from loosening of a folding knife according to claim 1, characterized in that: At least two protruding teeth (51) are arranged on the outer side wall of the locking member (5), and a groove is arranged between two adjacent protruding teeth (51).

3. The anti-loosening structure for preventing screws from loosening of a folding knife according to claim 2, characterized in that: The handle (1) is provided with a receiving groove (b) on one side of the shaft hole (a), the stopper (6) is arranged in the receiving groove (b), and the locking member (5) is arranged in the receiving groove (b) and abuts against the stopper (6).

4. The anti-loosening structure for preventing screws from loosening of a folding knife according to claim 3, characterized in that: The stopper (6) is at least one limiting protrusion (61) integrally arranged on the side wall of the accommodating groove (b) and capable of being plugged into the groove one by one.

5. The anti-loosening structure for preventing screws from loosening of a folding knife according to claim 3, characterized in that: The stopper (6) is a limit screw (62) fixed on the handle (1) and located in the receiving groove (b), and the screw head of the limit screw (62) is a conical surface capable of abutting against the groove.

6. The anti-loosening structure for preventing screws from loosening of a folding knife according to claim 3, characterized in that: The stopper (6) is at least two soft columns (63) arranged in the accommodating groove (b), the locking member (5) is surrounded by the soft columns (63), and the soft columns (63) can be squeezed into the groove.

7. The anti-loosening structure for preventing screws from loosening of a folding knife according to claim 3, characterized in that: The stopper (6) is an anti-loosening ring (64) arranged in the receiving groove (b) and sleeved outside the locking member (5), and the anti-loosening ring (64) respectively abuts against the inner side wall of the receiving groove (b) and the outer side wall of the locking member (5).

8. The anti-loosening structure for preventing a screw from loosening of a folding knife according to any one of claims 1 to 7, characterized in that: The locking member (5) is in the shape of a spline tooth.

9. The anti-loosening structure for preventing screws from loosening of a folding knife according to claim 1, characterized in that: The handle (1) comprises a handle (1) body and a lining (12) which are arranged in sequence from the outside to the inside; The lining (12) is embedded in one side of the handle (1) body, the anti-loosening structure is located between the handle (1) body and the lining (12), and the locking member (5) is limited outside the shaft hole (a).

10. The anti-loosening structure for preventing screws from loosening of a folding knife according to claim 9, characterized in that: The locking member (5) is arranged on one end of the knife shaft (3); a limiting portion (31) having a diameter larger than the shaft hole (a) is arranged on the end of the knife shaft (3) away from the locking member (5); the limiting portion (31) is located between the handle (1) body of one of the handles (1) and the lining (12); and an avoidance groove for accommodating the limiting portion (31) is arranged on one side of the handle (1) body.

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