Anti-loose drill tail screw

Abstract

The utility model discloses a kind of anti-loose drill tail screws, including stud part, the one end of stud part is equipped with drill tail part, the other end is equipped with outer hexagonal rotation part, outer hexagonal rotation part and stud part between being equipped with with two integrally flat round head gasket, several slot back to the pressing groove of stud part are distributed on flat round head gasket, the outside of pressing groove is connected with outside, the bottom of each pressing groove is equipped with a cold pressure piece with flat round head gasket integrally, the two sides of cold pressure piece are respectively equipped with the slit that makes it separate from flat round head gasket, cold pressure piece is bent inward and forms the "U" type structure of cross section, limiting piece is provided on cold pressure piece, which is inward hook;Stud part is sleeved with soft rubber ring, which end surface is against flat round head gasket, the outer side of soft rubber ring is provided with the limiting slot of closed ring shape, limiting piece is clamped in limiting slot.The drill tail screw has the characteristics of reliable fixation, good anti-loose effect, 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 an anti-loosening drill tail screw. Background Technology

[0002] Self-drilling screws, with their combined drilling and fastening functions, are widely used in connection scenarios involving steel structures, color steel plates, and aluminum alloys. In practical applications, the reliability of the anti-loosening mechanism between the screw and the connected parts directly determines the stability and safety of the connection structure. Existing self-drilling screws often employ a soft rubber ring fitted onto the stud to achieve the anti-loosening effect. The elastic deformation of the soft rubber ring fills the gap, increasing frictional resistance. However, in traditional structures, the soft rubber ring only relies on the end face of the screw head for axial restraint, lacking an effective circumferential and radial fixing structure. Under the torque during screw tightening, the soft rubber ring is prone to torsional displacement or even detachment from the stud, leading to the failure of the anti-loosening function. Furthermore, while some improved structures attempt to fix the soft rubber ring by adding a snap-fit ​​structure, these often suffer from structural complexity and high manufacturing difficulty, requiring additional assembly slots or separate snap-fit ​​components. This not only increases production processes and costs but may also reduce the structural strength of the screw itself, making it difficult to meet the needs of industrial mass production and practical applications. Therefore, developing a self-locking drill screw that is simple in structure, reliably fixed, and easy to process has become a pressing technical problem in this field. Accordingly, this utility model proposes a self-locking drill screw. Utility Model Content

[0003] The purpose of this utility model is to overcome the shortcomings of the prior art and provide a self-locking screw that has the characteristics of reliable fixing and good anti-loosening effect.

[0004] To solve the above-mentioned technical problems, the purpose of this utility model is achieved as follows: This utility model relates to an anti-loosening self-drilling screw, comprising a stud portion with threads on its outer wall, a drill tail portion at one end of the stud portion and an external hexagonal rotating portion at the other end, a flat round head washer integrally formed between the external hexagonal rotating portion and the stud portion, the flat round head washer having several grooves on its circumference facing away from the stud portion, the outer side of the grooves being in contact with the outside, and a cold pressing plate integrally formed with the flat round head washer at the bottom of each groove, the cold pressing plate having slits on both sides to separate it from the flat round head washer, the cold pressing plate being bent inwards downwards to form a horizontally oriented "U"-shaped structure, and a limiting piece acting as an inner hook on the cold pressing plate; a soft rubber ring with its end face abutting against the flat round head washer is fitted onto the stud portion, the outer side of the soft rubber ring having a closed ring-shaped limiting groove, the limiting piece being engaged in the limiting groove.

[0005] The present invention is further configured such that the end of the soft rubber ring facing the flat round head gasket has an outer chamfer.

[0006] The present invention is further configured such that the included angle between two adjacent pressure grooves is equal.

[0007] The present invention is further configured such that the number of pressure grooves is six.

[0008] The present invention is further configured such that the soft rubber ring is made of rubber material.

[0009] In summary, this utility model has the following beneficial effects: 1. A cold-pressed sheet integrally formed on a flat, round-headed gasket is bent to form a "U"-shaped structure with an inner hook-shaped limiting piece. This structure precisely engages with the limiting groove of the soft rubber ring, providing double fixation of the soft rubber ring from both circumferential and radial directions, preventing it from twisting and falling off. The soft rubber ring continuously adheres to the gasket and elastically fills the gap, improving the durability of anti-loosening properties and ensuring connection stability under vibration and impact conditions.

[0010] 2. All screw components are integrally molded. The cold-pressed sheet is directly formed through the pressing groove and cutting of the washer, without the need for additional accessories and processes. The six sets of pressing grooves are evenly distributed, which facilitates cold pressing, eliminates the assembly process, reduces production and material costs, and at the same time ensures the overall mechanical properties of the screw, making it suitable for mass production. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This is a structural schematic diagram from another perspective of the present invention; Figure 3 This is a partial structural schematic diagram of the present invention; Figure 4 This is a schematic diagram illustrating the structure of the soft rubber ring in this utility model. Detailed Implementation

[0012] 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.

[0013] The present invention will be further described below with reference to the accompanying drawings and preferred embodiments.

[0014] Example 1 See Figures 1 to 4As shown, the anti-loosening 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 flat round head 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 flat round head washer 3 has six grooves 4 with their openings facing away from the stud portion and with equal included angles between adjacent openings. The outer side of the grooves 4 is in contact with the outside. The bottom of each groove 4 is respectively provided with A cold-pressed sheet 5 is integral with the flat round head gasket. The cold-pressed sheet 5 has slits 6 on both sides to separate it from the flat round head gasket. The cold-pressed sheet 5 is bent inward downward to form a "U" shaped structure with a horizontal cross section. The cold-pressed sheet 5 is provided with a limiting piece 7 that acts as an inner hook. A soft rubber ring 8 made of rubber and with its end face abutting against the flat round head gasket is fitted on the stud part 1. A limiting groove 9 in the shape of a closed ring is opened on the outer side of the soft rubber ring 8. The limiting piece 7 is inserted into the limiting groove 9.

[0015] In this embodiment, the screw core structure includes a threaded stud portion, one end of which is a pointed conical drill tail with a cutting edge, and the other end is an external hexagonal rotating portion adapted to a wrench. A flat round-head washer is integrally connected between the rotating portion and the stud portion, and the diameter of the washer is larger than that of the stud portion to distribute pressure.

[0016] The gasket end face has six circumferentially spaced (60° intervals) pressure grooves with opposing studs. The bottom of the grooves retains the integral cold-pressed sheet with slits on both sides, so that the cold-pressed sheet is connected to the gasket only at the root and can be bent independently. The cold-pressed sheet is folded downward and inward into a horizontal "U" shape by a cold-pressing mold, and its free end hooks inward toward the axis to form a limiting piece. The rounded transition of the hook head facilitates locking.

[0017] The stud part is fitted with an aging-resistant rubber soft ring, one end of which is attached to the gasket. The outer side is provided with a closed annular limiting groove that matches the shape of the limiting piece. The soft ring can be fixed by the limiting piece snapping into it.

[0018] Assembly and use: First, process the gasket groove and cold press sheet (initially flush), then fit the soft rubber ring tightly against the gasket, and then bend the cold press sheet so that the limiting piece is inserted into the limiting groove to complete the fixation; when using, turn the wrench to rotate the hexagonal part, drill and tap the hole at the drill tail, tighten the stud part, and the locking structure ensures that the soft rubber ring is stable and plays an anti-loosening role.

[0019] Example 2 See Figures 1 to 4 As shown, the anti-loosening self-drilling screw involved in this embodiment is further configured, based on embodiment 1, with the soft rubber ring 8 having an outer chamfer 10 at the end facing the flat round head washer.

[0020] In this embodiment, the outer chamfer serves as a guide for the installation of the soft rubber ring.

[0021] This utility model relates to an anti-loosening self-locking screw. A cold-pressed sheet, integrally formed on a flat, round-head washer, is bent to form a "U"-shaped structure with an inner hook-shaped limiting piece. This structure precisely engages with the soft rubber ring's limiting groove, providing double fixation of the soft rubber ring circumferentially and radially, preventing it from twisting and falling off. The soft rubber ring continuously adheres to the washer and elastically fills the gaps, enhancing the anti-loosening durability and ensuring connection stability under vibration and impact conditions. Furthermore, all screw components are integrally formed; the cold-pressed sheet is directly formed through washer grooves and cuts, eliminating the need for additional accessories and processes. Six sets of grooves are evenly distributed, facilitating cold pressing, eliminating assembly steps, reducing production and material costs, while ensuring the screw's overall mechanical properties. It is suitable for mass production, has comprehensive functions, and is highly practical.

[0022] 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.

[0023] 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.

[0024] 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-locking drill 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, characterized in that: Between the external hexagonal rotating part and the stud part, there is a flat round head washer integrally formed with both. The flat round head washer has several grooves on its circumference facing away from the stud part. The outer side of the grooves is in contact with the outside. At the bottom of each groove, there is a cold pressing sheet integral with the flat round head washer. The cold pressing sheet has slits on both sides to separate it from the flat round head washer. The cold pressing sheet is bent inward downward to form a horizontal "U" shaped structure. The cold pressing sheet has a limiting piece that acts as an inner hook. The stud part is fitted with a soft rubber ring whose end face abuts against the flat round head washer. The outer side of the soft rubber ring has a closed ring-shaped limiting groove. The limiting piece is inserted into the limiting groove.

2. The anti-loosening drill screw according to claim 1, characterized in that: The end of the soft rubber ring facing the flat round head gasket has an outer chamfer.

3. The anti-loosening drill self-locking screw according to claim 1 or 2, characterized in that: The included angle between two adjacent pressure grooves is equal.

4. The anti-loosening drill self-locking screw according to claim 3, characterized in that: The number of pressure grooves is six.

5. The anti-loosening drill screw according to claim 1, characterized in that: The soft rubber ring is made of rubber.

Images