Segmented Screw Fastening Structure for Sub-One-Turn Assembly
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Solution Overview
Problem
Conventional fastening tools require significant time for fastening due to the length of screw threads, as they involve rotating screws relative to each other by their respective lengths.
Innovation Solution
A fastening tool design featuring a male screw-side member with alternating screw surfaces and peripheral pieces, and a female screw-side member with alternating screw surfaces and peripheral pieces, incorporating a locking mechanism through protruding and recessed portions on inclined surfaces to prevent relative rotation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If screw threads are made long to ensure proper engagement and fastening strength, then fastening reliability is improved, but fastening time increases significantly
Solution Approach 1:
The screw thread is divided into multiple independent engagement sections along the axial direction, each section capable of engaging independently. This segmentation allows the fastening action to be completed through partial engagement of sections rather than requiring full-length thread engagement, thereby reducing fastening time while maintaining reliability through distributed engagement points
Solution Approach 2:
The invention transitions from single-plane thread engagement to multi-plane engagement by arranging screw threads on different cylindrical surfaces (first cylindrical surface and second cylindrical surface) of the screw portion. This dimensional change enables simultaneous engagement at multiple locations, reducing the rotational distance required for complete fastening while ensuring reliable connection
2Strength
If conventional screw threads are used requiring full rotation engagement, then thread engagement strength is sufficient, but fastening operation becomes time-consuming
Solution Approach 1:
The screw threads are pre-positioned on multiple cylindrical surfaces at optimized angular intervals, creating predetermined engagement points that are optimally distributed. This preliminary arrangement of engagement sections allows the fastening operation to achieve sufficient strength through partial rotation, eliminating the need for complete thread engagement and significantly improving operation speed
Data Source
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AI summary
The present invention relates to a fastening tool. The fastening tool of the present invention includes: a male screw-side member (10) having a screw portion (11), the screw portion (11) being formed by alternately arranging, in an outer peripheral direction, male screw surfaces (12A, 12B) where male screw-side screw threads (12) are formed and outer peripheral pieces (13A, 13B) where the male screw-side screw threads (12) are not formed; and a female screw-side member (20) having a screw hole (21), the screw hole (21) being formed by alternately arranging, in an inner peripheral direction, female screw surfaces (22A, 22B) where female screw-side screw threads (22) are formed and inner peripheral pieces (23A, 23B) where the female screw-side screw threads (22) are not formed, the screw hole (21) allowing the male screw surfaces (12A, 12B) and the female screw surfaces (22A, 22B) to be threadedly engaged with each other.