Screw anti-loosening structure and scissors

Abstract

The utility model relates to the technical field of daily necessities, and particularly discloses a screw anti-loosening structure which comprises a first main body, a second main body, a main shaft, a first screw and a second screw, the edge of one end of the main shaft extends towards the outer side to form a shaft cap, the other end of the main shaft is provided with a D-shaped connecting part, and a first threaded hole is formed in the main shaft in a penetrating mode along the axis of the main shaft; a D-shaped connecting hole matched with the connecting part is formed in the first body, a round hole rotationally matched with the middle of the main shaft is formed in the second body, the first screw is in threaded fit with the first threaded hole, a second threaded hole is formed in the end, away from the nut, of the first screw along the axis of the first screw, and the second screw is in threaded fit with the second threaded hole. The screw anti-loosening structure and the scissors are convenient to disassemble and assemble, and meanwhile the screw on the main shaft can be prevented from loosening.

Description

Technical Field

[0001] The utility model relates to the technical field of daily necessities, in particular to a screw anti-loosening structure and a pair of scissors. Background Art

[0002] In daily life, the axis pins of scissors are mostly riveted to prevent them from loosening and falling off, which makes it difficult to replace accessories or perform maintenance. In most folding knives, the blades are usually installed by connecting the knife shaft and the handle with screws to facilitate disassembly and debugging. 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. At the same time, to prevent the screw from loosening, the thread anti-loosening glue is applied to the surface of the screw thread. However, after this structure is disassembled many times, the anti-loosening glue of the screw loses its anti-loosening ability, and the knife shaft and the handle shaft hole are clearance-matched. After opening and closing and turning the blade many times, the screw is easy to loosen, affecting the user experience and easily causing structural instability and safety hazards. Summary of the invention

[0003] The utility model aims to solve at least one of the above-mentioned technical problems and provides a screw anti-loosening structure and a pair of scissors, which are convenient for disassembly and assembly and can prevent the screws on the main shaft from loosening.

[0004] In order to achieve the above-mentioned purpose, the technical solution adopted by the utility model is: a screw anti-loosening structure, including a first body, a second body, a main shaft, a first screw and a second screw, the edge of one end of the main shaft extends outward with a shaft cap, the other end is provided with a D-shaped connecting portion, and a first threaded hole is provided inside the main shaft along its axis, a D-shaped connecting hole is provided on the first body and cooperates with the connecting portion, a circular hole is provided on the second body and rotates with the middle part of the main shaft, the first screw is threadedly engaged with the first threaded hole, and a second threaded hole is provided along its axis at the end of the first screw away from the nut, and the second screw is threadedly engaged with the second threaded hole.

[0005] Preferably, washers are provided between the nut of the first screw and the first body, and between the shaft cap and the second body.

[0006] Preferably, the inner hole edge of the washer is provided with a groove matching the first screw nut and the shaft cap.

[0007] Preferably, a countersunk hole cooperating with the nut of the second screw is provided in the middle of the shaft cap.

[0008] Preferably, the pitch of the first screw is different from the pitch of the second screw.

[0009] Preferably, the nut of the first screw and the nut of the second screw have the same shape.

[0010] The present application also discloses a pair of scissors, comprising any of the above-mentioned screw anti-loosening structures.

[0011] The beneficial effect is that compared with the prior art, the screw anti-loosening structure and scissors of the utility model are provided with a D-shaped connecting hole on the first body to cooperate with the D-shaped connecting part on the main shaft, and the first screw is threadedly matched with the first threaded hole at the end of the main shaft, so that the main shaft, the first body and the first screw constitute a whole that can rotate synchronously relative to the second body, thereby effectively avoiding the situation that the first screw rotates relative to the first body during the rotation of the first body relative to the second body, thereby improving the stability of the installation of the first screw, so as to achieve the purpose of effectively preventing the first screw from loosening, and by providing a second screw, the second screw is threadedly matched with the first screw, so as to play the role of locking the first screw, so as to further improve the stability of the installation of the first screw, and at the same time, the first screw, the second screw and the main shaft are connected by thread, which is convenient for disassembly and assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] The specific implementation of the utility model is further described in detail below with reference to the accompanying drawings, wherein:

[0013] Figure 1 A schematic diagram of a screw anti-loosening structure of the present application;

[0014] Figure 2 A schematic diagram of disassembly of a screw anti-loosening structure of the present application;

[0015] Figure 3 The structural diagram of the main axis;

[0016] Figure 4 is a schematic structural diagram of a first screw;

[0017] Figure 5 It is a structural schematic diagram of one implementation mode of the second screw;

[0018] Figure 6 It is a schematic structural diagram of another implementation manner of the second screw. DETAILED DESCRIPTION

[0019] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0020] It should be noted that when a component is referred to as being "fixed to" another component, it may be directly on the other component or there may be a central component. When a component is considered to be "connected to" another component, it may be directly connected to the other component or there may be a central component at the same time. When a component is considered to be "set on" another component, it may be directly set on the other component or there may be a central component at the same time. When a component is referred to as being "set in the middle", it does not only mean being set in the middle, as long as it is not set at both ends within the range defined by the middle. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only.

[0021] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0022] like Figures 1 to 4 As shown, a screw anti-loosening structure includes a first body 1, a second body 2, a main shaft 3, a first screw 4 and a second screw 5. The edge of one end of the main shaft 3 extends outward with a shaft cap 6, and the other end is provided with a D-shaped connecting portion 7, and the inside of the main shaft 3 is penetrated by a first threaded hole 8 along its axis, the first body 1 is provided with a D-shaped connecting hole 9 matched with the connecting portion 7, the second body 2 is provided with a circular hole 10 rotatably matched with the middle part of the main shaft 3, the first screw 4 is threadedly matched with the first threaded hole 8, and the end of the first screw 4 away from the nut is provided with a second threaded hole 11 along its axis, and the second screw 5 is threadedly matched with the second threaded hole 11.

[0023] During installation, the main shaft 3 is passed through the circular hole 10 and the connecting hole 9 in turn, and the connecting part 7 is matched with the connecting hole 9, and the second body 2 is rotatably matched with the main shaft 3 through the circular hole 10, and then the first screw 4 is threadedly matched with the first threaded hole 8 at the end of the main shaft 3, so as to fix the first screw 4 on the main shaft 3, and the first body 1 and the second body 2 are limited by the nut of the first screw 4 and the shaft cap 6 of the main shaft 3 to prevent the first body 1 and the second body 2 from moving along the axial direction of the main shaft 3, and then the second screw 5 is inserted into the main shaft 3, and threadedly matched with the second threaded hole 11 at the end of the first screw 4, so as to lock and fix the first screw 4 on the main shaft 3.

[0024] A screw anti-loosening structure of the utility model is provided with a D-shaped connecting hole 9 on the first main body 1 to cooperate with the D-shaped connecting part 7 on the main shaft 3, and the first screw 4 is threadedly matched with the first threaded hole 8 at the end of the main shaft 3, so that the main shaft 3, the first main body 1 and the first screw 4 constitute a whole that can rotate synchronously relative to the second main body 2, thereby effectively avoiding the situation that the first screw 4 rotates relative to the first main body 1 during the rotation of the first main body 1 relative to the second main body 2, thereby improving the installation stability of the first screw 4, so as to achieve the purpose of effectively preventing the first screw 4 from loosening, and by providing a second screw 5, the second screw 5 is threadedly matched with the first screw 4, so as to play the role of locking the first screw 4, so as to further improve the installation stability of the first screw 4.

[0025] In one preferred embodiment, a washer 12 may be provided between the nut of the first screw 4 and the first body 1, and between the shaft cap 6 and the second body 2. The washer 12 can effectively reduce the wear between the nut of the first screw 4 and the first body 1, and between the shaft cap 6 and the second body 2 during the disassembly and assembly process, and can also play a certain decorative effect and improve the aesthetic appearance. Further, the inner hole edge of the washer 12 may be provided with a groove 13 that matches the nut of the first screw 4 and the shaft cap 6. During installation, the groove 13 cooperates with the nut of the first screw 4 and the shaft cap 6 of the main shaft 3, so that the nut of the first screw 4 and the shaft cap 6 of the main shaft 3 will not protrude from the outer surface of the washer 12 after installation, thereby improving the stability of the installation and the aesthetic appearance.

[0026] In the present application, a countersunk hole 14 cooperating with the nut of the second screw 5 may be provided in the middle of the shaft cap 6. When installed, the countersunk hole 14 can completely accommodate the shaft cap 6 of the second screw 5, so that the nut of the second screw 5 will not protrude from the surface of the shaft body, thereby improving the aesthetic appearance. Figure 5 As shown, in this embodiment, the middle part of the shaft cap 6 may be recessed with a latching position that cooperates with a screwdriver to facilitate the disassembly and assembly of the second screw 5; Figure 6 As shown, in another embodiment, the nut of the second screw 5 includes a boss that cooperates with the countersunk hole 14, and a cap body arranged on the boss. During installation, only the boss cooperates with the countersunk hole 14, and the cap body partially extends out of the shaft body and fits against the end of the shaft body. The edge of the cap body is provided with a latching position that cooperates with a wrench to facilitate the disassembly and assembly of the second screw 5. In this embodiment, the nut of the first screw 4 adopts the same shape structure as the cap body of the second screw 5 to facilitate the disassembly and assembly of the first screw 4 and the second screw 5.

[0027] In a more preferred embodiment of the present application, the pitch of the first screw 4 is different from the pitch of the second screw 5, so that when the first screw 4 rotates, the second screw 5 can limit the first screw 4, thereby improving the locking effect of the second screw 5 on the first screw 4.

[0028] In addition, the present application also discloses a pair of scissors, including any of the above-mentioned screw anti-loosening structures. The first body 1 and the second body 2 are the two scissor blades of the scissors respectively. A blade is set at one end of the two scissors, a handle is set at the other end, and the middle part is connected by a main shaft 3. A pair of scissors of the utility model is provided with a D-shaped connecting hole 9 on the first body 1 to cooperate with the D-shaped connecting part 7 on the main shaft 3, and the first screw 4 is threadedly matched with the first threaded hole 8 at the end of the main shaft 3, so that the main shaft 3, the first body 1 and the first screw 4 constitute a whole that can rotate synchronously relative to the second body 2, thereby effectively avoiding the situation that the first screw 4 rotates relative to the first body 1 during the rotation of the first body 1 relative to the second body 2, thereby improving the stability of the installation of the first screw 4, so as to achieve the purpose of effectively preventing the first screw 4 from loosening, and by providing a second screw 5, the second screw 5 is threadedly matched with the first screw 4, so as to play the role of locking the first screw 4, so as to further improve the stability of the installation of the first screw 4.

[0029] The above embodiments are only used to illustrate the technical solution of the utility model but not to limit it. Any modification or equivalent substitution that does not deviate from the spirit and scope of the utility model shall be included in the scope of the technical solution of the utility model.

Claims

1. A screw anti-loosening structure, characterized in that: The invention comprises a first body (1), a second body (2), a main shaft (3), a first screw (4) and a second screw (5); an edge of one end of the main shaft (3) is provided with a shaft cap (6) extending outward, and a D-shaped connecting portion (7) is provided at the other end, and a first threaded hole (8) is provided inside the main shaft (3) along its axis; a D-shaped connecting hole (9) is provided on the first body (1) and is matched with the connecting portion (7); a round hole (10) is provided on the second body (2) and is rotatably matched with the middle part of the main shaft (3); the first screw (4) is threadedly matched with the first threaded hole (8); a second threaded hole (11) is provided along its axis at one end of the first screw (4) away from the nut; and the second screw (5) is threadedly matched with the second threaded hole (11).

2. A screw anti-loosening structure according to claim 1, characterized in that: A washer (12) is provided between the nut of the first screw (4) and the first body (1), and between the shaft cap (6) and the second body (2).

3. A screw anti-loosening structure according to claim 2, characterized in that: The inner hole edge of the washer (12) is provided with a groove (13) matching the nut of the first screw (4) and the shaft cap (6).

4. A screw anti-loosening structure according to claim 1, characterized in that: A countersunk hole (14) is provided in the middle of the shaft cap (6) and is matched with the nut of the second screw (5).

5. The screw anti-loosening structure according to claim 1, characterized in that: The pitch of the first screw (4) is different from the pitch of the second screw (5).

6. The screw anti-loosening structure according to claim 1, characterized in that: The nut of the first screw (4) and the nut of the second screw (5) have the same shape.

7. A pair of scissors, characterized in that: It comprises the screw anti-loosening structure described in any one of claims 1-6.

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