Novel expansion screw
By designing a barbed structure on the expansion screw sleeve, the problem of insufficient gripping performance of the existing expansion screw is solved, and a higher load-bearing capacity is achieved.
Patent Information
- Application Number
- CN202420942689.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-04-30
- Publication Date
- 2024-12-13
- Estimated Expiration
- 2034-04-30
AI Technical Summary
The smooth outer structure of the sleeve of the existing expansion screws leads to its relatively average grasping and biting performance on the inner wall of the hole and limited load-bearing capacity.
A new type of expansion screw was designed, and its sleeve includes an upper pipe section and a lower pipe section. Multiple groups of barbed structures are formed on the outside of the lower pipe section. The expansion head of the bolt is inserted into the inner wall of the hole through these barbed structures to improve the gripping and biting performance.
Through the design of the barbing structure, the load-bearing capacity of the expansion screw is significantly improved and the grasping force between the sleeve and the inner wall of the hole is enhanced.
Smart Images
Figure CN222163144U_ABST
Abstract
Description
[Technical field]
[0001] The utility model relates to a novel expansion screw. [Background technology]
[0002] Expansion screws are usually used to fix on walls, to install fixed equipment, or to hoist objects. At present, the expansion screws on the market embed a sleeve in the hole, and use the bolt to move outward to expand the bottom of the sleeve, so that it is stuck in the hole. The surface of the existing sleeve is smooth and straight, and the gripping performance on the inner wall of the hole is relatively general, so its load-bearing capacity is relatively limited.
[0003] Therefore, it is necessary to make further improvements. [Utility Model Content]
[0004] The purpose of the utility model is to overcome the above problems. We provide a new expansion screw, the sleeve of which is provided with a barb structure to improve the gripping performance.
[0005] To achieve the above-mentioned purpose, we provide a new type of expansion screw, including a sleeve, a bolt, a washer and a nut. The bolt is inserted into the sleeve, the washer and the nut are arranged on the top of the sleeve, the top of the bolt passes through the washer and the nut and is threadedly connected with the nut. The sleeve includes an upper pipe section and a lower pipe section. The circular diameter of the lower pipe section is smaller than that of the upper pipe section, and multiple groups of barb structures are formed on the outer side of the lower pipe section from top to bottom. When viewed from a top-down angle, the upper pipe section completely blocks the barb structure, and the bottom end of the bolt extends out of the sleeve and is provided with an expansion head.
[0006] In one or more embodiments, the sleeve and the bolt are made of iron material, and the lower pipe section has a plurality of vertical grooves distributed circumferentially, and the vertical grooves penetrate the inner and outer side walls of the lower pipe section.
[0007] In one or more embodiments, an arc-shaped transition surface is provided between the bottom end and the inner side surface of the lower tube section.
[0008] In one or more embodiments, the upper tube section, the lower tube section and the barb structure are an integrated structure.
[0009] In one or more embodiments, at least three groups of barb structures are provided on the lower pipe section, and each group of barb structures is composed of a plurality of circumferentially distributed barbs.
[0010] In one or more embodiments, the expansion head is elliptical.
[0011] Compared with the background technology, the utility model has the following technical effects: the sleeve of the expansion screw is provided with a barb structure, but after the sleeve is expanded by the bolt, the barb structure is used to insert into the inner wall of the hole, thereby improving the gripping ability and improving the bearing capacity of the expansion screw as a whole.
Brief Description of the Drawings
[0012] Figure 1 It is a cross-sectional view of the expansion screw of the utility model;
[0013] Figure 2 It is a cross-sectional view of the sleeve of the utility model. [Specific implementation method]
[0014] In order to deepen the understanding of the present invention, the present invention will be further described in detail below in conjunction with embodiments and drawings. The embodiments are only used to explain the present invention and do not constitute a limitation on the protection scope of the present invention.
[0015] Please see Figure 1-2 The present application provides a new expansion screw, including a sleeve 1, a bolt 2, a washer 3 and a nut 4, the bolt 2 is inserted into the sleeve 1, the washer 3 and the nut 4 are arranged at the top of the sleeve 1, the top of the bolt passes through the washer and the nut and is threadedly connected with the nut, the sleeve 1 includes an upper pipe section 11 and a lower pipe section 12, the circular diameter of the lower pipe section is smaller than that of the upper pipe section, an arc-shaped transition structure is provided between the upper pipe section and the lower pipe section, and a plurality of groups of barb structures 5 are formed on the outer side of the lower pipe section 12 from top to bottom, when viewed from a top-down angle, the upper pipe section 11 completely blocks the barb structure, which can prevent the inner wall of the hole from flattening the barb structure when the sleeve is buried in the hole, affecting the use of the barb structure, the bottom end of the bolt 2 extends out of the sleeve and is provided with an expansion head 21. When in use, the user hammers the sleeve into the hole, and then moves the bolt outward by twisting the nut. At this time, the expansion head gradually expands the lower pipe section outward. During the expansion process, the barb structure is inserted into the inner wall of the hole, thereby improving the gripping performance of the sleeve and the inner wall of the hole.
[0016] The sleeve 1 and the bolt 2 are made of iron material, and the lower pipe section 12 is circumferentially provided with a plurality of vertical grooves 6, which penetrate the inner and outer side walls of the lower pipe section, and the vertical grooves can make it easier for the expansion head to open the lower pipe section. Preferably, an arc-shaped transition surface 7 is provided between the bottom end and the inner side surface of the lower pipe section 12, and the arc-shaped transition surface plays a guiding role, which can help the expansion head to open the lower pipe section.
[0017] The upper pipe section 11, the lower pipe section 12 and the barb structure 5 are an integrated structure to ensure the structural strength of the barb structure.
[0018] At least three groups of barb structures 5 are arranged on the lower tube section 12. The specific number of groups is determined according to the length and diameter of the sleeve. Each group of barb structures is composed of a plurality of circumferentially distributed barbs, so that each barb independently penetrates into the inner wall of the hole, which helps to improve the gripping ability.
[0019] The expansion head 21 is elliptical in shape, and the elliptical expansion head is easier to lower the pipe sleeve section, thus saving effort.
[0020] The above description is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiment. Any equivalent modifications or changes made by ordinary technicians in this field based on the contents disclosed in the present invention should be included in the protection scope recorded in the claims.
Claims
1. A novel expansion screw, comprising a sleeve (1), a bolt (2), a washer (3) and a nut (4), wherein the bolt (2) is inserted into the sleeve (1), the washer (3) and the nut (4) are arranged on the top of the sleeve (1), and the top of the bolt passes through the washer and the nut and is screwed to the nut, characterized in that: The sleeve (1) comprises an upper pipe section (11) and a lower pipe section (12); the circular diameter of the lower pipe section is smaller than that of the upper pipe section, and a plurality of groups of barb structures (5) are formed on the outer side of the lower pipe section (12) from top to bottom; when viewed from a top-down angle, the upper pipe section (11) completely covers the barb structures; the bottom end of the bolt (2) extends out of the sleeve and is provided with an expansion head (21).
2. A novel expansion screw according to claim 1, characterized in that: The sleeve (1) and the bolt (2) are made of iron material. The lower pipe section (12) is provided with a plurality of vertical grooves (6) distributed in the circumferential direction, and the vertical grooves penetrate the inner and outer side walls of the lower pipe section.
3. A novel expansion screw according to claim 2, characterized in that: An arc-shaped transition surface (7) is provided between the bottom end and the inner side surface of the lower pipe section (12).
4. A novel expansion screw according to claim 2, characterized in that: The upper pipe section (11), the lower pipe section (12) and the barb structure (5) are an integrated structure.
5. A novel expansion screw according to any one of claims 1 to 4, characterized in that: At least three groups of barb structures (5) are arranged on the lower pipe section (12), and each group of barb structures is composed of a plurality of circumferentially distributed barbs.
6. A novel expansion screw according to any one of claims 1 to 4, characterized in that: The expansion head (21) is elliptical.