Screwdriver Bit Reduced Threaded Section Stress Distribution
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Solution Overview
Problem
Screwdriver bits often experience stress concentration and breakage at the transition section during torque transmission, posing a safety hazard to users due to a smaller cross-sectional area of the insertion portion compared to the shank.
Innovation Solution
A screwdriver bit design featuring a reduced, threaded section with an outer diameter smaller than the shank and outer threading, which provides uniform stress distribution and mitigates stress concentration during torque transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the cross sectional area of the insertion portion is made smaller than that of the shank, then the bit can be coupled with the socket, but stress concentration occurs in the transition section leading to breakage
Solution Approach 1:
The patent applies local quality by creating a reduced section with specific geometric features (smaller cross-sectional area) at the transition zone between the shank and insertion portion. This localized structural modification redistributes stress away from the critical transition area, preventing stress concentration while maintaining the coupling capability between the bit and socket.
2Volume of moving object
If the insertion portion has a smaller cross sectional area than the shank, then the bit structure is compact, but stress concentration leads to breakage during torque transmission
Solution Approach 1:
The patent changes the geometric parameters of the transition section by creating a reduced section with a smaller cross-sectional area compared to both the shank and insertion portion. This parameter modification optimizes the stress distribution during torque transmission, enhancing reliability while maintaining a compact bit structure suitable for coupling with sockets.
Data Source
AI summary
A screwdriver bit includes a shank for coupling with a tool for rotating the shank. An engaging portion extends from one of two ends of the shank and includes an insertion section for coupling with a fastener. A reduced, threaded section is formed between one of the ends of the shank and the insertion section of the engaging portion. The reduced, threaded section includes an outer diameter smaller than that of the ends of the shank and an outer threading. The outer threading of the reduced, threaded section provides uniform stress distribution during torque transmission.