Threaded anti-loose fastener
By using internal threaded connectors and through-hole design in threaded connections, the problem of loosening of threaded connections under vibration and impact loads is solved, achieving a fastening effect that is both aesthetically pleasing and prevents loosening while allowing for multiple disassemblies.
Patent Information
- Application Number
- CN202520772730.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-04-23
- Publication Date
- 2026-02-17
- Estimated Expiration
- 2035-04-23
AI Technical Summary
Existing threaded connections are prone to loosening under vibration, temperature changes and impact loads, resulting in weak connections. Furthermore, traditional anti-loosening methods are complex to operate, require a lot of space and are aesthetically unappealing.
The design employs a connector with internal threads and a through-hole connector. The connection between the stud and the nut is achieved through threaded connection. Loosening is prevented by using the internal threads of the stud and the connector with the same internal thread parameters. Only one nut is used, and the other connector is machined with a through hole or internal thread to prevent rotation.
It maintains preload under vibration, temperature changes, and impact loads to prevent loosening, has an attractive appearance, is easy to operate, is suitable for applications where appearance is important, and can be disassembled multiple times.
Smart Images
Figure CN223923504U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of threaded connection technology, and in particular relates to a threaded anti-loosening fastener. Background Technology
[0002] Threaded connections are a very common type of connection in daily work, used in military, industrial enterprises, and daily civilian life. Metric threads and pipe threads do not loosen under normal vibration, temperature changes, and impact loads, meeting usage requirements. However, they can loosen under large vibrations, temperature changes, and impact loads, resulting in an unstable connection and affecting normal use. Therefore, anti-loosening measures need to be considered in the design. Currently, there are mechanical, frictional, chemical, and permanent anti-loosening methods. Frictional anti-loosening methods commonly use spring washers and counter-nuts. Spring washers use the elasticity at the spring opening to apply a small axial force to the nut end face, but their anti-loosening effect is not good. Counter-nuts also have drawbacks: 1. This method requires specific operation; 2. It requires sufficient space and is not aesthetically pleasing. Based on these methods, a new type of thread anti-loosening method needs to be designed. Summary of the Invention
[0003] The purpose of this invention is to provide a threaded anti-loosening fastener that can maintain sufficient preload under impact, vibration, temperature changes, and other conditions to prevent the nut from loosening, while also maintaining an aesthetically pleasing appearance. This method differs from permanent anti-loosening, as it can be disassembled multiple times and is simpler to operate than mechanical anti-loosening.
[0004] The objective of this utility model is achieved through the following technical solution:
[0005] The threaded anti-loosening fastener of this utility model is characterized in that it includes a connector with internal threads, a connector with through holes, a stud and a nut, wherein the stud passes through the connector with internal threads and the connector with through holes and is threadedly connected to the connector with internal threads, and the nut is threadedly connected to the stud.
[0006] The external thread of the stud has the same parameters as the internal thread of the connector with internal threads.
[0007] Advantages of this utility model:
[0008] This utility model of threaded anti-loosening fastener has a simple main structure, using only one nut and another internal thread on one of the connecting parts. It has an aesthetically pleasing appearance and is particularly suitable for bolting two connecting parts. One part has a through hole and the other has an internal thread hole, so the connecting part with the internal thread will not rotate. Only one nut is visible, making it suitable for occasions where appearance is important, while also meeting the anti-loosening requirements. It is also convenient to use. Attached Figure Description
[0009] Figure 1This is a schematic diagram of the structure of this utility model. Detailed Implementation
[0010] The specific embodiments of this utility model are further described below with reference to the accompanying drawings.
[0011] like Figure 1 As shown, the threaded anti-loosening fastener of this utility model is characterized by comprising a connector 3 with internal threads, a connector 4 with through holes, a stud 1 and a nut 2. The stud 1 passes through the connector 3 with internal threads and the connector 4 with through holes and is threadedly connected to the connector 3 with internal threads. The nut 2 is threadedly connected to the stud 1.
[0012] The external thread of the stud 1 has the same parameters as the internal thread of the internal thread of the connector 3 with internal thread.
[0013] In the anti-loosening method using counter-nuts, the first nut is typically tightened to tensile the bolt, causing it to elongate. The nut then moves in the opposite direction, securing component 1 and component 2. The second nut is then screwed in, and the first nut is held in place with a wrench before tightening the second nut. Tightening is then complete. Generally, the first nut is slightly thinner than the second; otherwise, the two nuts would become one, merely increasing the engagement length without providing axial counter-nutring. The effective number of turns for both internal and external threads is greater than 3 but less than 6. The first nut experiences more stress and is prone to loosening. To address this, a connecting component with a through hole and another with internal threads can be used to replace the first nut. This prevents rotation and thus prevents loosening.
[0014] Specific implementation process:
[0015] 1. According to the assembly requirements, machine a through hole in one of the two fastening parts so that the stud can pass through smoothly, and machine an internal thread in the other part to screw it into the stud to fasten the two fastening parts.
[0016] 2. Align the two connectors (connector 3 with internal thread and connector 4 with through hole), select the appropriate length of stud 1 according to the thickness of the two connectors, then pass stud 1 through the through hole of connector 4 and screw it into the internal thread of connector 3 with internal thread, and tighten stud 1 to achieve the designed tightening torque requirement.
[0017] 3. Install nut 2 on the exposed stud 1 and tighten it. There are no special requirements for tightening; it is the same as installing ordinary bolts, and the operation is simple. Install according to the assembly sequence until the requirements are met.
[0018] The threaded anti-loosening fastener of this utility model has a simple main structure, using only one nut 2, and another internal thread on one of the connecting parts. It has an aesthetically pleasing appearance and is particularly suitable for bolting two connecting parts. One part has a through hole and the other has an internal thread hole, so the connecting part 3 with the internal thread will not rotate. Only one nut 2 is visible, making it suitable for occasions where appearance is important, while also meeting the anti-loosening requirements. It is also easy to use.
Claims
1. A threaded captive fastener, characterized by, The connecting piece with internal thread, the connecting piece with through hole, the stud and the nut, the stud is through the connecting piece with internal thread and the connecting piece with through hole, and is in thread connection with the connecting piece with internal thread, the nut is in thread connection with the stud.
2. The threaded captive fastener of claim 1, wherein, The outer thread of the stud and the inner thread of the connecting piece with internal thread are same in parameters.