Segmented Screw Fastener for Faster Thread Engagement
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Solution Overview
Problem
Conventional fastening tools require significant time for screw threads to engage due to their length, leading to inefficiencies in the fastening process.
Innovation Solution
The fastening tool features a male screw-side member with alternating screw threads and outer peripheral pieces, and a female screw-side member with alternating screw threads and inner peripheral pieces, designed to facilitate quicker engagement by varying thread widths and incorporating locking mechanisms such as protruding and recessed portions to prevent loosening.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If screw threads are made long to ensure secure fastening, then fastening strength is improved, but fastening time increases significantly
Solution Approach 1:
The screw thread is divided into multiple segments along the axial direction, with each segment having a specific engagement length. This segmentation allows the thread to achieve sufficient fastening strength through distributed engagement while reducing the total thread length required, thereby decreasing fastening time.
Solution Approach 2:
Different segments of the screw thread are designed with varying local characteristics, including different pitch values and engagement lengths. The first segment has a larger pitch for rapid initial engagement, while subsequent segments have smaller pitches for secure fastening. This local quality variation optimizes both fastening speed and strength.
2Productivity
If screw threads are made short to reduce fastening time, then fastening speed is improved, but fastening strength decreases
Solution Approach 1:
The screw thread is divided into multiple segments along the axial direction, with each segment having a specific engagement length. This segmentation allows the thread to achieve sufficient fastening strength through distributed engagement while reducing the total thread length required, thereby decreasing fastening time.
Solution Approach 2:
The pitch of the screw thread varies across different segments. The first segment has a larger pitch for rapid initial engagement, while subsequent segments have smaller pitches for secure fastening. This parameter change optimizes both fastening speed and strength.
3Reliability
If locking mechanisms are added to prevent loosening, then reliability is improved, but device complexity increases
Solution Approach 1:
The locking function is merged with the screw thread structure itself. The varying pitch segments create a self-locking effect where the threaded connection naturally resists loosening due to the geometric progression of thread engagement, eliminating the need for separate locking mechanisms.
Solution Approach 2:
The screw thread design provides self-locking capability through its segmented structure with varying pitches. The progressive engagement of threads creates a mechanical interlock that automatically prevents loosening without requiring additional locking components or operations.
Data Source
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AI summary
Provided is a fastening tool capable of shortening the time required for fastening. The present invention is provided with: a male screw-side member that comprises a screw section 11 in which the following are disposed in alternation, male screw surfaces 12A, 12B in which are formed male screw-side screw threads 12, and outer peripheral pieces 13A, 13B in which no male screw-side screw threads 12 are formed; and a female screw-side member 20 that comprises a screw hole 21 in which the following are disposed in alternation, female screw surfaces 22A, 22B in which are formed female screw-side screw threads 22, and inner peripheral pieces 23A, 23B in which no female screw-side screw threads 22 are formed, the male screw surfaces 12A, 12B and the female screw surfaces 22A, 22B being capable of screwing together. The male screw-side screw threads 12 are formed so as to increase in width, in an axial direction of the screw section 11, as the threads proceed from ahead to behind in a direction of relative rotation when the male screw surfaces 12A, 12B and the female screw surfaces 22A, 22B screw together. The female screw-side screw threads 22 are formed so as to decrease in width, in an axial direction of the screw hole 21, as the threads proceed from ahead to behind in the direction of relative rotation.