Anti-disengagement screw

Abstract

The utility model discloses a non-disengagement screw which comprises a screw end portion, a screw rod portion and a polished rod portion arranged between the screw end portion and the screw rod portion, the ruler diameter of the polished rod portion is smaller than that of the screw rod portion, a boss is arranged at the end, close to the screw end portion, of the polished rod portion, and the boss is cylindrical. The diameter of the boss is larger than that of the polished rod portion and smaller than that of the screw rod portion, a plurality of evenly-distributed limiting blocks are arranged on the outer side of the end, close to the screw end portion, of the boss, and the limiting blocks protrude out of the screw rod portion. The boss and the limiting block are arranged to ensure that the gasket or the gasket is stably arranged, so that the anti-disengaging performance of the screw is improved when the screw is integrally connected and used; and on the other hand, the limiting block can limit and clamp the auxiliary base plate to achieve application to different gaskets or gaskets, and the application performance is improved.

Description

Technical Field

[0001] This utility model relates to the field of screw technology, specifically to a non-removable screw. Background Technology

[0002] A Chinese utility model patent with application number 201920835985.8 discloses a non-removable screw, which ensures that the screw will not be eccentric when using ordinary washers, thus affecting the connection stability, by adding boss structures at both ends of the smooth rod. However, in the above structure, the boss has the same diameter as the bolt rod, while the washer is larger than the bolt rod. As a result, when the washer is placed at the boss position, there is still an eccentricity phenomenon, which affects the connection effect. Utility Model Content

[0003] The purpose of this invention is to address the shortcomings of the aforementioned background technology by providing a screw that ensures a stable connection without coming loose.

[0004] To achieve the above objectives, the present invention provides a non-removable screw using the following technical solution:

[0005] A non-removable screw includes a screw end, a screw shank, and a smooth shank disposed between the screw end and the screw shank. The diameter of the smooth shank is smaller than the diameter of the screw shank. A boss is provided at one end of the smooth shank near the screw end. The boss is cylindrical and its diameter is larger than the diameter of the smooth shank but smaller than the diameter of the screw shank. A plurality of evenly distributed limiting blocks are provided on the outer side of the end of the boss near the screw end, and the limiting blocks protrude from the screw shank.

[0006] A further improvement of this utility model regarding a screw that does not come out is that an auxiliary pad for installing an auxiliary washer is also provided at the boss. The auxiliary pad is a hollow cylinder, and multiple limiting grooves are evenly distributed on the upper surface of the auxiliary pad. The limiting grooves are opened from the inner sidewall of the auxiliary pad outwards, and the limiting blocks correspond one-to-one with the limiting grooves, and the limiting blocks are engaged in the limiting grooves.

[0007] A further improvement of this utility model regarding a non-removable screw is that the outer periphery of the limiting pad is threaded and a second auxiliary pad is screwed to it. The second auxiliary pad is also hollow cylindrical, and connecting threads are provided on both the inner and outer walls of the second auxiliary pad.

[0008] A further improvement of this utility model regarding a screw that does not come out is that the boss, the limiting block, and the smooth rod are integrally formed.

[0009] Compared with the prior art, the beneficial effects of this utility model are:

[0010] This utility model features a boss and a limiting block to ensure the stable placement of washers or gaskets, thereby increasing their ability to prevent them from coming loose when the screws are used in a unified connection. On the other hand, the limiting block can also limit and lock the auxiliary pad to accommodate different washers or gaskets, thus improving applicability. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the structure of this utility model;

[0012] Figure 2 This is a schematic diagram of the structure of the auxiliary pad of this utility model.

[0013] In the diagram, 1 is the screw end, 2 is the screw shank, 3 is the smooth shank, 4 is the boss, 5 is the limiting block, 6 is the auxiliary pad, and 7 is the limiting groove. Detailed Implementation

[0014] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0015] like Figure 1 As shown, a non-removable screw includes a screw end 1, a screw shank 2, and a smooth shank 3 disposed between the screw end and the screw shank. The diameter of the smooth shank is smaller than the diameter of the screw shank. A boss 4 is provided at one end of the smooth shank near the screw end. The boss is cylindrical and its diameter is larger than the diameter of the smooth shank but smaller than the diameter of the screw shank. A plurality of evenly distributed limiting blocks 5 are provided on the outer side of the end of the boss near the screw end. The limiting blocks protrude from the screw shank.

[0016] Furthermore, an auxiliary pad 6 for installing auxiliary washers is provided at the boss. The auxiliary pad is a hollow cylinder, and multiple limiting grooves 7 are evenly distributed on the upper surface of the auxiliary pad. The limiting grooves open outward from the inner sidewall of the auxiliary pad, and the limiting blocks correspond one-to-one with the limiting grooves, and the limiting blocks are engaged in the limiting grooves. Washers or gaskets can be placed on the outer ring side of the auxiliary pad to ensure that there is no eccentric movement during connection.

[0017] Furthermore, the outer periphery of the limiting pad is threaded and screwed with a second auxiliary pad. The second auxiliary pad is larger than the first auxiliary pad and is also a hollow cylinder. Both the inner and outer walls of the second auxiliary pad are provided with connecting threads. This increases the applicability to washers or gaskets of different sizes.

[0018] Furthermore, the boss, the limiting block, and the smooth rod can be integrally molded.

[0019] Working principle: The washer or shim is passed through the screw shank and fitted onto the outside of the limiting block. Then the screw is connected to the required connection structure, followed by riveting to achieve a stable connection without the screw coming out. When adjusting the size of the washer or shim, auxiliary shims or auxiliary shims and second auxiliary shims can be adaptively arranged to improve the applicability of the screw to different shims.

[0020] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A non-removable screw, characterized in that: It includes a screw end, a screw shank, and a smooth shank disposed between the screw end and the screw shank. The diameter of the smooth shank is smaller than the diameter of the screw shank. A boss is provided at the end of the smooth shank near the screw end. The boss is cylindrical and its diameter is larger than the diameter of the smooth shank but smaller than the diameter of the screw shank. A plurality of evenly distributed limiting blocks are provided on the outer side of the end of the boss near the screw end. The limiting blocks protrude from the screw shank.

2. The non-removable screw according to claim 1, characterized in that: The boss is also provided with an auxiliary pad for installing the auxiliary washer. The auxiliary pad is a hollow cylinder. Multiple limiting grooves are evenly distributed on the upper surface of the auxiliary pad. The limiting grooves are opened from the inner side wall of the auxiliary pad outward. The limiting block corresponds to the limiting groove one by one, and the limiting block is inserted into the limiting groove.

3. A non-removable screw according to claim 2, characterized in that: The auxiliary pad has threads on its outer periphery and is screwed to a second auxiliary pad. The second auxiliary pad is also a hollow cylinder, and both its inner and outer walls are provided with connecting threads.

4. A non-removable screw according to claim 3, characterized in that: The boss, the limiting block, and the smooth rod are integrally formed.

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