Internally-threaded body duplex thread reverse rotation prevention
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Solution Overview
Problem
Conventional screws and anti-loosening nuts primarily use either right-handed or left-handed threads, lacking a duplex threaded body with both clockwise and counter-clockwise threads, which limits their locking effectiveness and leads to loosening issues under vibrations and other external forces.
Innovation Solution
An internally threaded body with a tubular shape featuring a clockwise or counter-clockwise spiral thread and reverse rotation preventing means, such as plate pieces with a specific inclination angle, is used in conjunction with a duplex externally threaded body to enhance locking by preventing reverse rotation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional single-handed threads (right-handed or left-handed) are used in bolts and nuts, then the structure is simple and easy to manufacture, but the locking effectiveness is insufficient and loosening occurs under vibrations and external forces
Solution Approach 1:
The patent combines both right-handed and left-handed threads into a single duplex threaded body, creating overlapping right-handed and left-handed threaded portions on the same bolt. This merging of opposite thread types enables dual-directional locking capability, preventing loosening under vibrations while maintaining structural integration rather than using separate components.
Solution Approach 2:
The duplex threaded body is segmented into distinct right-handed threaded portions and left-handed threaded portions that overlap along the axial direction. This segmentation allows each thread type to independently engage with corresponding nuts, providing separate locking mechanisms that work together to enhance overall reliability without requiring a completely new unified thread design.
2Reliability
If anti-loosening mechanisms are added to prevent loosening under vibrations, then the locking reliability improves, but the device complexity and structural intricacy increase
Solution Approach 1:
The patent integrates the anti-loosening function directly into the threaded body by combining right-handed and left-handed threads in a single duplex structure. This eliminates the need for separate anti-loosening mechanisms like lock washers, nyloc nuts, or adhesive applications, as the dual-thread design inherently provides vibration resistance through opposing locking directions.
Solution Approach 2:
The duplex threaded body performs its own anti-loosening function through the inherent mechanical interaction between the overlapping right-handed and left-handed threads and their corresponding nuts. The structure self-regulates to prevent loosening under vibrations without requiring external anti-loosening additives or additional protective components, making the fastening system self-sufficient.
Data Source
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AI summary
An internally threaded body is described. A clockwise spiral thread and a counter-clockwise spiral thread are provided as a pair. The internally-threaded body (1180) has a clockwise or counter-clockwise intermittent or continuous spiral thread (1183) formed on the inner circumferential surface of a tubular member having a roughly tubular shape, and has, on one end in the tubular direction of the tubular member, reverse rotation preventing means for preventing reverse rotation relative to the direction of rotation when screwed onto the duplex threaded body. The reverse rotation preventing means has one or more plate pieces (1186,1187), the plate piece is arranged protruding from the inner circumferential surface of the tubular member towards the axis of rotation of the internally-threaded body, the end portion of the plate piece serves as a clockwise or counter-clockwise spiral thread, and the thread formed by the end of the plate piece has a finite inclination angle relative to a lead angle of the thread formed on the inner circumferential surface of the tubular member.