Anti-loosening bolt

The bolt design with opposite thread grooves and enhanced friction surfaces addresses the loosening issue in vibrating structures, enhancing stability and safety by preventing nut movement.

JP3249922UActive Publication Date: 2025-01-23志村 征夫
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Patent Information

Application Number
JP2024003885U
Authority / Receiving Office
JP · JP
Patent Type
Utility models
Current Assignee / Owner
Filing Date
2024-11-01
Publication Date
2025-01-23
Estimated Expiration
2034-11-01

AI Technical Summary

Technical Problem

Bolts used in vibrating structures, machinery, and vehicles are prone to loosening due to vibrations, posing a risk of accidents.

Method used

The bolt shaft features two types of thread grooves in opposite directions, with a main nut and a sub-nut to prevent loosening, enhanced by increased friction on contact surfaces through surface treatment.

Benefits of technology

Prevents loosening of main bolts and nuts by maintaining tension even under vibration, ensuring stability and safety.

✦ Generated by Eureka AI based on patent content.

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Abstract

To provide a bolt that prevents a nut from loosening and is used in parts where vibration occurs in structures, machinery, vehicles, etc. The bolt shaft is provided with two types of nut parts, a main nut part and a sub-nut part, which are threaded in opposite directions. The diameter of the sub-nut part is set to a value that does not interfere with the insertion of the main nut.
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Description

[Technical field]

[0001] A bolt thread is provided on the bolt shaft in the opposite direction, and a nut is attached to this position to prevent the nut for final tightening from loosening.

[0002] Currently, when bolts are used in parts that generate vibrations in structures, machinery, vehicles, etc., there is a risk that the bolts may loosen due to the vibrations, leading to accidents.

[0003] The present invention aims to solve such problems. In order to achieve the above object, the bolt shaft is provided with two types of thread grooves in the opposite directions on the same axis.

[0004] The nut that directly tightens the material is called the main nut, and the nut that stops this main nut is called the secondary nut. If the main nut tries to move toward the secondary nut due to vibration transmitted to the bolt shaft, the adjacent secondary nut thread grooves are oriented in the direction of movement toward the main nut, so the main nut is prevented from loosening. As a result of the above, the main bolt and nut will not come loose. It will be even more effective if the contact surfaces of the main and auxiliary nuts are treated with a surface treatment to increase friction. [Brief description of the drawings]

[0005] [Figure 1] FIG. [Diagram 2] FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0006] The bolt shaft is provided with a main nut portion and a sub-nut portion, the threading directions of which are opposite to each other. The diameter of the sub-nut portion is set so as not to interfere with the insertion of the main nut. [Explanation of symbols]

[0007] (Cross section of bolt part shown) A: Bolt body (red line) B: Material TIFF0003249922000002.tif2192

Claims

[Claim 1] A bolt that prevents the nut from loosening by having a nut thread engraved on the bolt shaft.