A pop stud fastener system
By using the inverted L-shaped spring clip and elastic pad composite structure of the spring clip fastener system, combined with anchor bolts and spring washers, the problems of complex structure and unstable fastening pressure of existing railway fastener systems are solved, achieving stable fastening pressure and reducing costs.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- CHINA RAILWAY ERYUAN ENGINEERING GROUP CO LTD
- Filing Date
- 2025-07-19
- Publication Date
- 2026-07-31
AI Technical Summary
Existing railway fastening systems are complex and costly. Furthermore, simple foreign fasteners are prone to loosening when used in non-critical areas due to unstable fastening pressure, resulting in insufficient safety and durability.
The system employs a spring-loaded fastener system, which is a composite structure consisting of an inverted L-shaped spring and an elastic pad. It is connected to a threaded sleeve by anchor bolts and combined with a spring washer to form a stable preload. The anchoring force is improved by shot blasting, which simplifies the structure and reduces costs.
It achieves stable fastening pressure with simple and economical structure, reduces material consumption and failure risk, facilitates operation and maintenance, and improves safety and durability.
Smart Images
Figure CN224578560U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to railway tracks, and in particular to a spring-loaded fastener system. Background Technology
[0002] my country's existing railway fastening system is complex in structure and expensive, making it uneconomical when applied to lower-grade railways overseas or to non-critical components such as guard rails. Furthermore, existing simple fasteners and guard rail fasteners abroad lack an elastic clamping structure, resulting in unstable clamping force and easy loosening of critical components such as fastener bolts, leading to serious deficiencies in fastener safety and durability. Therefore, there is an urgent need to develop a new railway fastening system that is simple in structure, economical, and provides stable clamping force. Utility Model Content
[0003] The technical problem to be solved by this utility model is to provide a spring-loaded fastener system to effectively simplify the fastener system structure and save on line engineering costs.
[0004] The technical solution adopted by this utility model to solve its technical problem is as follows:
[0005] This utility model discloses a spring-loaded fastener system, comprising a threaded sleeve pre-embedded in a concrete sleeper and an anchor bolt threadedly connected to the threaded sleeve. The system is characterized by further including an inverted L-shaped spring with a vertical arm and a horizontal arm. An elastic pad is fixedly installed on the bottom surface of the horizontal arm. The threaded portion of the anchor bolt passes through an installation hole located in the middle of the horizontal arm and the elastic pad and is tightened and fixed inside the threaded sleeve. This causes the lower end of the vertical arm to abut against and support the top surface of the concrete sleeper, and the distal end of the horizontal arm and the elastic pad below it to form a clamping pressure on the top surface of the rail bottom structure. The distal end of the horizontal arm and the elastic pad below it are combined by vulcanization or bonding. A spring washer acting on the top surface of the horizontal arm is fitted at the top of the threaded portion.
[0006] The beneficial effects of this utility model are mainly reflected in the following aspects:
[0007] 1. The inverted L-shaped spring clip is combined with the elastic pad under the spring clip through vulcanization or bonding to form a composite elastomer structure. It has high elasticity, good preload retention, and stable fastening force. It can replace the complex and expensive spring clip structure in traditional fasteners, reducing costs.
[0008] 2. In traditional fasteners, the elastic pad is placed under the rail and must be the same width as the rail bottom. In this solution, the elastic pad is placed below the inverted L-shaped spring clip, and its width is only 60% of that of traditional fasteners, which greatly saves the amount of elastic pad material used and reduces costs;
[0009] 3. The inverted L-shaped spring is supported on one side of the sleeper and pressed against the rail base on the other side. The upper part of the inverted L-shaped spring is provided with bolt holes for the anchor bolts to pass through. The sleeper, rail base and anchor bolts form a limit on the inverted L-shaped spring. Its structure is simple and the limiting effect is good. There is no need to use a complex limiting structure, which reduces costs and reduces potential failure points.
[0010] 4. Utilizing the anchoring force between the anchor bolt and the threaded sleeve as the tightening force, applied to the spring washer and inverted L-shaped spring, a stable preload can be formed. Furthermore, the anchoring force can be adjusted during operation by changing the torque of the anchor bolt, facilitating operation and maintenance. The surface of the anchor bolt thread is shot-blasted to increase surface roughness, further improving the anchoring force. Attached Figure Description
[0011] This instruction manual includes the following four figures:
[0012] Figure 1 This is a cross-sectional view of a spring-loaded fastener system according to this utility model;
[0013] Figure 2 This is a cross-sectional view of a composite structure of an inverted L-shaped spring and a lower elastic pad in a spring-type fastener system according to this utility model.
[0014] Figure 3 This is a top view of an inverted L-shaped spring in a spring-loaded fastener system according to this utility model;
[0015] Figure 4 This is a top view of the elastic gasket in a spring-loaded fastener system according to this utility model.
[0016] The figure shows the components and their corresponding markings: rail 10, rail pad 11, concrete sleeper 20, threaded sleeve 21, inverted L-shaped spring clip 30, vertical arm 31, horizontal arm 32, elastic pad 33, mounting hole 34, anchor bolt 40, and spring washer 41. Detailed Implementation
[0017] The present invention will be further described below with reference to the accompanying drawings and embodiments.
[0018] Reference Figure 1 This utility model discloses a spring-loaded fastener system, including a threaded sleeve 21 pre-embedded in a concrete sleeper 20, and an anchor bolt 40 threadedly connected to the threaded sleeve 21. It also includes an inverted L-shaped spring 30 with a vertical arm 31 and a horizontal arm 32. (See reference...) Figure 2 and Figure 3 An elastic pad 33 is fixedly installed on the bottom surface of the inverted L-shaped spring 30 and the cross arm 32. (Refer to...) Figure 1The threaded portion of the anchor bolt 40 passes through the mounting hole 34 located in the middle of the crossarm 32 and the elastic pad 33 and is tightened and fixed inside the threaded sleeve 21, so that the lower end of the vertical arm 31 rests against and is supported on the top surface of the concrete sleeper 20, and the distal end of the crossarm 32 and the elastic pad 33 below it form a clamping pressure on the top surface of the bottom structure of the rail 10. To prevent the anchor bolt 40 from loosening, a spring washer 41 acting on the top surface of the crossarm 32 is fitted at the top of the threaded portion.
[0019] This utility model combines the inverted L-shaped spring piece 30 with the elastic pad 33 on the bottom surface of its cross arm 32 to form a composite elastic body structure. It has high elasticity and good pre-tightening force retention function, and provides stable fastening force to the bottom structure of the rail 10. It can replace the complex and expensive spring strip structure in traditional fasteners, thus effectively reducing costs.
[0020] The inverted L-shaped spring sheet 30 can be made of spring steel with grades 65Mn or 60Si2Mn. The elastic pad 33 is usually made of rubber or polyurethane material, and the elastic pad 33 is fixed to the inverted L-shaped spring sheet 30 by adhesive bonding or vulcanization.
[0021] The surface of the anchor bolt 40 is shot-blasted with steel shot of 1mm diameter to increase surface roughness and further improve its anchoring force.
[0022] Reference Figure 1 A rail pad 11 for adjusting the height is provided between the bottom surface of the rail 10 and the top surface of the concrete sleeper 20. The rail pad 11 is generally made of rubber-plastic elastomer or polyethylene material, and its thickness can be different. By replacing the rail pad 11 with different thicknesses, the height of the rail can be adjusted.
[0023] The above description is merely an illustration of some principles of the spring-loaded fastener system of this utility model, and is not intended to limit this utility model to the specific structure and applicable scope shown and described. Therefore, all possible modifications and equivalents that may be used fall within the patent scope of this utility model.
Claims
1. A pop rivet fastener system comprising a threaded sleeve (21) embedded in a concrete sleeper (20) and an anchor bolt (40) threaded into the threaded sleeve (21), characterised in that: It also includes an inverted L-shaped spring clip (30) with a vertical arm (31) and a horizontal arm (32). An elastic pad (33) is fixedly installed on the bottom surface of the horizontal arm (32). The threaded part of the anchor bolt (40) passes through the mounting hole (34) located in the middle of the horizontal arm (32) and the elastic pad (33) and is tightened in the threaded sleeve (21), so that the lower end of the vertical arm (31) rests against the top surface of the concrete sleeper (20), and the elastic pad (33) at the far end of the horizontal arm (32) and below it forms a clamping pressure on the top surface of the bottom structure of the rail (10). A spring washer (41) acting on the top surface of the horizontal arm (32) is fitted at the top of the threaded part.
2. A popper fastener system according to claim 1, wherein: The inverted L-shaped spring sheet (30) is made of spring steel with grade 65Mn or 60Si2Mn, and the elastic pad (33) is made of rubber or polyurethane. The elastic pad (33) is bonded to the inverted L-shaped spring sheet (30) by adhesive bonding or vulcanization.
3. A popper fastener system according to claim 1, wherein: A rail pad (11) for adjusting height is provided between the bottom surface of the rail (10) and the top surface of the concrete sleeper (20).