Anti-slip Fastener Driver Segmented Driving Recesses
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Solution Overview
Problem
Conventional fastener drivers cause wear on fasteners due to mismatched sizes, leading to damage and slipping during driving, especially when the driving hole becomes nearly circular.
Innovation Solution
An anti-slip fastener driver is designed with a shank, a driving portion, and a plurality of engaging recesses. The driving portion includes a top end face, outer peripheral faces, driving recesses with bevel faces, and a base, where the engaging recesses extend into the driving portion from the bevel faces towards the base.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional fastener driver is used to drive a fastener, then the fastener can be driven, but the fastener wears due to material softness and size mismatch, leading to driving hole damage and slip
Solution Approach 1:
The driving portion is segmented into multiple driving recesses (at least two) with different inclination angles, allowing different segments to engage with different portions of the fastener's driving hole. This segmentation enables the driver to maintain effective engagement even when parts of the driving hole become damaged or worn, preventing slip and maintaining driving reliability.
Solution Approach 2:
Different driving recesses are designed with different local qualities, specifically different inclination angles relative to the longitudinal axis. This allows each driving recess to engage with specific portions of the fastener's driving hole, providing localized engagement that adapts to wear patterns and prevents complete failure even when some areas are damaged.
2Device complexity
If a fastener driver with a single driving recess is used, then the structure is simple, but it slips when the driving hole becomes damaged or nearly circular
Solution Approach 1:
The driving portion is divided into multiple driving recesses with different inclination angles, creating multiple engagement points with the fastener. This segmentation ensures that even if the driving hole becomes damaged or circular, at least one driving recess can maintain effective engagement, preventing slip while maintaining reasonable structural complexity.
3Ease of manufacture
If fasteners are made softer than fastener drivers to reduce fastener damage, then fastener replacement is easier, but wear occurs during driving
Solution Approach 1:
The driver is pre-configured with multiple driving recesses of different inclination angles before use. This preliminary design ensures that the driver can adapt to various wear conditions and driving hole conditions without requiring changes to the fastener material or design, thereby preventing wear-related failures while maintaining ease of fastener manufacture and replacement.
Data Source
AI summary
An anti-slip fastener driver includes a shank, a driving portion, and a plurality of engaging recesses. The driving portion is formed on an end of the shank and includes a top end face, a plurality of outer peripheral faces, a plurality of driving recesses formed on the top end face, and a base spaced from the top end face. each driving recess has a bevel face and a driving face. The engaging recesses are respectively formed on the outer peripheral faces. Each engaging recess (40b; 40c) extends into the driving portion from the bevel face of each driving recess towards the base.