Anti-loosening self-tapping screw

Abstract

The utility model relates to the technical field of screws, in particular to an anti-loosening self-tapping screw which comprises a screw body and a locking mechanism located in the screw body. The locking mechanism comprises a mounting cavity formed in the screw body, two sets of locking rods with the ends capable of extending out of the outer surface of the screw body and the tails located in the mounting cavity and arranged on the screw body in a radial sliding and penetrating mode, and a driving assembly rotationally mounted in the mounting cavity and capable of driving the two sets of locking rods to advance and retreat at the same time. And the end part of the locking rod is provided with a thread part which is in transition butt joint with the external thread of the screw body. The technical problems that in the prior art, the thread is damaged and the locking ball is difficult to return due to the fact that the locking ball abuts against the external thread are solved.

Description

Technical Field

[0001] The utility model relates to the technical field of screws, in particular to a self-tapping screw that prevents loosening. Background Art

[0002] When screws are used on equipment, the self-locking reliability of the screws will be reduced under dynamic loads. Therefore, locking screws are required in important anti-loosening situations.

[0003] The utility model patent with Chinese patent application number CN202222250151.5 discloses a bending-resistant positioning locking screw, including a screw rod, a locking device is arranged inside the outer surface of the screw rod, and the locking device includes a locking ball for locking, and the locking ball performs a locking action on the screw rod. The bending-resistant positioning locking screw can improve the performance of the screw rod by setting a reinforcing layer and a wear-resistant layer. The AlTiN coating in the reinforcing layer increases the strength of the screw rod, and the MoS2 coating in the wear-resistant layer increases the wear resistance, corrosion resistance, rust resistance and high temperature resistance of the screw rod, thereby increasing the service life of the screw rod. At the same time, the reinforcing ribs can increase the strength and hardness of the screw rod, thereby preventing the screw rod from bending during use, solving the technical problem that the existing screws will bend, causing the screws to be unable to be evenly forcefully screwed into the wall, resulting in a waste of screws.

[0004] However, the outward movement of the locking ball in the device will damage the threads of the threaded hole, and with long-term use, impurities will accumulate in the movement channel of the locking ball, thereby affecting the retraction of the locking ball. The above two problems will affect the use of the screw. Utility Model Content

[0005] In view of the above problems, the utility model provides a self-tapping screw that prevents loosening. Locking rods are symmetrically penetrated on both radial sides of the screw body. The ends of the locking rods are provided with threaded portions that smoothly transition and dock with the threads of the screw body. The driving assembly is located in the installation cavity and can drive the two groups of locking rods forward and backward. The locking rods and the external threads lock the screw body, which solves the technical problems in the prior art that the locking ball conflicts with the external threads, causing damage to the threads and the locking ball is difficult to retract.

[0006] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0007] A self-tapping screw that prevents loosening, includes a screw body and a locking mechanism located inside the screw body, the locking mechanism includes an installation cavity opened in the screw body, two groups of locking rods whose ends can extend out of the outer surface of the screw body and whose tails are located in the installation cavity and radially slide through the screw body, and a driving component that is rotatably installed in the installation cavity and can drive the two groups of locking rods to advance and retreat simultaneously, and a threaded portion is provided on the end of the locking rod for transition and docking with the outer thread of the screw body.

[0008] As an improvement, the screw body is a semicircular head screw.

[0009] As an improvement, the driving assembly includes a rotating seat threadedly matched with the top of the installation cavity, a hexagonal hole opened above the rotating seat, a vertical rod coaxially installed at the bottom of the rotating seat, and a driving unit that dynamically connects the vertical rod and the locking rod.

[0010] As an improvement, the rotating seat is connected to the top of the installation cavity via a fine-pitch thread.

[0011] As an improvement, the driving unit includes a limiting rod correspondingly installed at the tail of the locking rod, a limiting plate coaxially fixedly installed at the bottom of the vertical rod, and a limiting groove correspondingly opened on the limiting plate and capable of accommodating the limiting rod, wherein the limiting groove is arranged in an arc shape.

[0012] As an improvement, the limiting plate and the locking rod are spaced apart.

[0013] The beneficial effects of the utility model are:

[0014] (1) In the utility model, the outer end of the locking rod is provided with a threaded portion. When the locking rod is extended to tighten the screw body, the threaded portion engages with the inner thread of the external threaded hole, so that the end of the locking rod will not damage the external thread, thereby ensuring that the screw body can be removed smoothly;

[0015] (2) In the present invention, the rotation of the rotating seat causes the limit plate to rotate, and the limit rod moves in the limit groove to cause the locking rod to move forward and backward, thereby ensuring that the locking rod can still be retracted after the screw body has been used for a long time, and the screw body can be smoothly removed;

[0016] (3) In the present invention, the rotating seat and the mounting cavity are matched with each other through fine pitch threads, which ensures that the rotating seat will not loosen during the use of the screw body, thereby improving the self-locking ability of the screw body.

[0017] In summary, the utility model has the advantages of simple structure, convenient use and good thread fastening effect, and is particularly suitable for the field of fasteners. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0019] Figure 2 for Figure 1 Enlarged view of point A in the middle;

[0020] Figure 3 This is a schematic diagram of the internal structure of the utility model;

[0021] Figure 4 for Figure 3 Enlarged view of point B in the middle. DETAILED DESCRIPTION

[0022] 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 in 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.

[0023] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0024] 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 the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0025] Example:

[0026] like Figure 1As shown, a self-tapping screw that prevents loosening includes a screw body 1 and a locking mechanism 2 located inside the screw body 1, wherein the locking mechanism 2 includes an installation cavity 21 opened in the screw body 1, two groups of locking rods 22 whose ends can extend out of the outer surface of the screw body 1 and whose tails are located in the installation cavity 21 and radially slide through the screw body 1, and a driving component 23 that is rotatably installed in the installation cavity 21 and can drive the two groups of locking rods 22 to advance and retreat simultaneously, and a threaded portion 221 is provided on the end of the locking rod 22 for transition and docking with the external thread of the screw body 1.

[0027] It should be noted that if Figure 2 As shown, the threaded portion 221 is consistent with the thread of the screw body 1.

[0028] Furthermore, the screw body 1 is a semicircular head screw.

[0029] It should be noted that the screw body 1 is tightened using a hexagonal wrench.

[0030] Further, such as Figure 3 As shown, the driving assembly 23 includes a rotating seat 231 threadedly matched with the top of the installation cavity 21, a hexagonal hole 232 opened above the rotating seat 231, a vertical rod 233 coaxially installed at the bottom of the rotating seat 231, and a driving unit 234 that dynamically connects the vertical rod 233 and the locking rod 22.

[0031] Furthermore, the rotating seat 231 is connected to the top of the installation cavity 21 via a fine thread.

[0032] It should be noted that the fine pitch thread prevents the rotating seat 231 from loosening after being tightened.

[0033] It should be further explained that the position of the rotating seat 231 does not affect the screwing of the screw body 1 .

[0034] Further, such as Figure 4 As shown, the driving unit 234 includes a limiting rod 2341 correspondingly installed at the tail of the locking rod 22, a limiting plate 2342 coaxially fixedly installed at the bottom of the vertical rod 233, and a limiting groove 2343 correspondingly opened on the limiting plate 2342 and capable of accommodating the limiting rod 2341, wherein the limiting groove 2343 is arranged in an arc shape.

[0035] It should be noted that when the limiting plate 2342 rotates, the limiting rod 2341 moves in the limiting groove 2343, and then the locking rod 22 can move.

[0036] It should be further explained that the locking rod 22 can only be moved by rotating the rotating seat 231 .

[0037] Furthermore, the limiting plate 2342 and the locking rod 22 are spaced apart.

[0038] It should be noted that the limiting plate 2342 and the locking rod 22 are spaced apart so that when the rotating seat 231 rotates, the limiting plate 2342 will move downward, and thus the locking rod 22 needs to avoid it.

[0039] Working process:

[0040] The screw body 1 is screwed into the threaded hole, and then the rotating seat 231 is screwed so that the vertical rod 233 drives the limiting plate 2342 to rotate, and the limiting rod 2341 moves in the limiting groove 2343. The locking rod 22 extends out and its end is tightly attached to the inner wall of the threaded hole to tighten the screw body 1; if the screw body 1 needs to be removed, the opposite is true.

[0041] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A self-tapping screw that prevents loosening, characterized in that: The invention comprises a screw body (1) and a locking mechanism (2) located inside the screw body (1), wherein the locking mechanism (2) comprises a mounting cavity (21) provided in the screw body (1), two sets of locking rods (22) whose ends can extend out of the outer surface of the screw body (1) and whose tails are located in the mounting cavity (21) and radially slide through the screw body (1), and a driving assembly (23) rotatably mounted in the mounting cavity (21) and capable of driving the two sets of locking rods (22) to move forward and backward simultaneously, and a threaded portion (221) is provided on the end of the locking rod (22) for transitionally docking with the external thread of the screw body (1).

2. The anti-loosening self-tapping screw according to claim 1, characterized in that: The screw body (1) is a semicircular head screw.

3. The anti-loosening self-tapping screw according to claim 1, characterized in that: The driving assembly (23) comprises a rotating seat (231) threadedly engaged with the top end of the mounting cavity (21), a hexagonal hole (232) provided above the rotating seat (231), a vertical rod (233) coaxially mounted at the bottom of the rotating seat (231), and a driving unit (234) dynamically connecting the vertical rod (233) and the locking rod (22).

4. The anti-loosening self-tapping screw according to claim 3, characterized in that: The rotating seat (231) is connected to the top of the installation cavity (21) via a fine thread.

5. The anti-loosening self-tapping screw according to claim 3, characterized in that: The driving unit (234) comprises a limiting rod (2341) correspondingly mounted on the tail of the locking rod (22), a limiting plate (2342) coaxially fixedly mounted on the bottom of the vertical rod (233), and a limiting groove (2343) correspondingly opened on the limiting plate (2342) and capable of accommodating the limiting rod (2341), wherein the limiting groove (2343) is arranged in an arc shape.

6. The anti-loosening self-tapping screw according to claim 5, characterized in that: The limiting plate (2342) and the locking rod (22) are arranged at a distance.

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