A drill pilot screw

Abstract

The utility model discloses a kind of drill tail screws, including the screw thread of outer wall surface with stud portion, the one end of stud portion is equipped with drill tail part, the other end is equipped with outer hexagonal rotation part, outer hexagonal rotation part with the round gasket being integrally with both between the stud portion, the round gasket is wrapped with heat shrink tube after heat shrink, heat shrink tube includes the outer baffle ring of being equipped in the one end of the round gasket, the inner baffle ring of being equipped in the other end of round gasket, inner baffle ring with the outer baffle ring between the bundle tube body being wrapped in the outer periphery of round gasket;The inside and / or outside of the inner baffle ring is equipped with the protruding portion being integrally with it, and protruding portion is closed ring shape.This screw has the characteristics of reliable anti-loose, convenient installation, overall function is perfect, and practicality is strong.

Description

Technical Field

[0001] This utility model relates to the field of fastener manufacturing technology, and more specifically, it relates to a self-drilling screw. Background Technology

[0002] Self-drilling screws, as fasteners that combine drilling and tightening functions, are widely used in construction, home appliances, automobiles, and other fields due to their efficient installation characteristics. In practical use, to prevent loosening of the screw under vibration and stress conditions and to ensure connection stability, anti-loosening rubber rings are usually installed on the screw's washer. However, for long-shank self-drilling screws with long studs, the traditional installation method of anti-loosening rubber rings has significant drawbacks: because the rubber ring itself has a certain degree of elasticity and its inner diameter usually matches the outer diameter of the washer, accurately fitting the rubber ring onto the round washer under the obstruction of the long stud is not only cumbersome and time-consuming, but also prone to problems such as misalignment and damage, affecting the anti-loosening effect. At the same time, some rubber rings are prone to aging and deformation during long-term use, further reducing the reliability of the screw connection and failing to meet the dual requirements of modern industry for fastener installation efficiency and operational stability. Utility Model Content

[0003] The purpose of this utility model is to overcome the shortcomings of the prior art and provide a self-drilling screw that is reliable in preventing loosening and easy to install.

[0004] To solve the above-mentioned technical problems, the purpose of this utility model is achieved as follows: The present utility model relates to a self-drilling screw, which includes a stud portion with threads on its outer wall surface, a drill tail portion at one end of the stud portion and an external hexagonal rotating portion at the other end, and a circular washer integrally formed between the external hexagonal rotating portion and the stud portion. The circular washer is covered with a heat-shrinkable tube after heat shrinking. The heat-shrinkable tube includes an outer retaining ring at one end of the circular washer and an inner retaining ring at the other end of the circular washer. A bundled tube body wrapped around the outer periphery of the circular washer is provided between the inner retaining ring and the outer retaining ring.

[0005] The present invention is further configured such that: the inner side and / or the outer side of the inner retaining ring are provided with a protrusion integral thereon, and the protrusion is in the shape of a closed ring.

[0006] The present invention is further configured such that the protrusion is located on the inner side of the inner retaining ring.

[0007] In summary, this utility model has the following beneficial effects: 1. The inner retaining ring formed by heat shrink tubing fits tightly and has a stable anti-loosening structure; heat shrink tubing is resistant to aging and wear, and has a longer service life than traditional soft rubber rings, which can ensure reliable connection for a long time and reduce maintenance.

[0008] 2. The large inner diameter of the non-heat-shrinkable heat shrink tubing allows it to be easily fitted onto round washers. Installation can be completed with simple heat shrinking, without the need for complicated tools, significantly improving the assembly efficiency of long-rod self-drilling screws. Attached Figure Description

[0009] Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This is a schematic diagram of another embodiment of the present invention. Detailed Implementation

[0010] To enable those skilled in the art to better understand the technical solution of this utility model, the preferred embodiments of this utility model are described below in conjunction with specific examples. However, it should be understood that these descriptions are only for further illustrating the features and advantages of this utility model, and not for limiting the patent claims of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without inventive effort are within the scope of protection of this utility model.

[0011] The present invention will be further described below with reference to the accompanying drawings and preferred embodiments.

[0012] Example 1 See Figure 1 As shown, the self-drilling screw involved in this embodiment includes a stud portion 1 with threads on its outer wall surface. One end of the stud portion 1 is provided with a drill tail portion (not shown), and the other end is provided with an external hexagonal rotating portion 2. A circular washer 3, which is integral with the stud portion 1, is provided between the external hexagonal rotating portion 2 and the stud portion 1. The circular washer 3 is covered with a heat-shrinkable tube 4 after heat shrinking. The heat-shrinkable tube 4 includes an outer retaining ring 401 provided at one end of the circular washer and an inner retaining ring 402 provided at the other end of the circular washer. A bundled tube body 403 wrapped around the outer periphery of the circular washer is provided between the inner retaining ring 402 and the outer retaining ring 401.

[0013] This embodiment of the self-drilling screw includes a stud, a drill tail, an external hexagonal rotating part, a round washer, and heat shrink tubing. All components are integrally molded to ensure stability. A heat shrink tubing with an inner diameter larger than the round washer before heat shrinking is selected, cut to a suitable length, and fitted onto the round washer. Heating with a hot air gun causes the heat shrink tubing to shrink and tightly wrap around the round washer, forming an outer retaining ring, an inner retaining ring, and the tubing body. In use, the external hexagonal rotating part drives the drill tail to drill a hole. After the stud is screwed in, the inner retaining ring fits snugly against the connector to prevent loosening.

[0014] Example 2 See Figure 2 As shown, the self-drilling screw involved in this embodiment is further configured based on embodiment 1, wherein the inner retaining ring 402 has an integral protrusion 404 on its inner side, and the protrusion 404 is in the shape of a closed ring.

[0015] In this embodiment, a closed-ring protrusion is added to the inner side of the inner retaining ring to thicken the inner retaining ring, giving it better elasticity and enhancing the anti-loosening effect.

[0016] The self-drilling screw involved in this utility model features a tightly fitting inner retaining ring formed by heat shrink tubing, ensuring a stable anti-loosening structure. The heat shrink tubing is resistant to aging and wear, with a longer service life than traditional soft rubber rings, guaranteeing reliable connection over a long period and reducing maintenance. Furthermore, the un-heat-shrinked heat shrink tubing has a large inner diameter, allowing it to be easily fitted onto a round washer. Installation can be completed with simple heat shrinking without the need for complex tools, significantly improving the assembly efficiency of long-rod self-drilling screws. Overall, it is functionally complete and highly practical.

[0017] Unless otherwise specified, in this utility model, terms such as "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the actual orientation or positional relationship shown. They are used only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the terms used to describe orientation or positional relationships in this utility model are for illustrative purposes only and should not be construed as limiting this patent. For those skilled in the art, the specific meaning of the above terms can be understood in conjunction with the embodiments and according to the specific circumstances.

[0018] Unless otherwise expressly specified and limited, the terms "set up," "connected," and "linked" in this utility model should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0019] The preferred embodiments of this utility model have been described in detail above. It should be understood that those skilled in the art can make numerous modifications and variations based on the concept of this utility model without creative effort. Therefore, all technical solutions that can be obtained by those skilled in the art based on the concept of this utility model through logical analysis, reasoning, or limited experimentation on the basis of existing technology should be within the scope of protection defined by the claims.

Claims

1. A self-drilling screw, comprising a stud portion with threads on its outer wall, one end of the stud portion having a drill tail portion and the other end having an external hexagonal rotating portion, and a circular washer integrally formed therebetween the external hexagonal rotating portion and the stud portion, characterized in that: The circular gasket is covered with a heat-shrinkable tube after heat shrinking. The heat-shrinkable tube includes an outer retaining ring at one end of the circular gasket and an inner retaining ring at the other end of the circular gasket. A bundled tube body wrapped around the outer periphery of the circular gasket is provided between the inner retaining ring and the outer retaining ring.

2. The self-drilling screw according to claim 1, characterized in that: The inner retaining ring has an integral protrusion on its inner side and / or outer side, and the protrusion is in the shape of a closed ring.

3. The self-drilling screw according to claim 2, characterized in that: The protrusion is located on the inner side of the inner retaining ring.

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