Anti-slip Fastener Driver with Inclined Bevel Faces
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional fastener drivers cause wear on fasteners due to mismatched sizes and damage the driving holes, leading to slipping issues when trying to drive damaged screws.
Innovation Solution
An anti-slip fastener driver with a hexagonal cross-sectional shape and inclined driving recesses that engage with the damaged screw's inner wall, providing a stable contact surface to prevent slipping.
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 and driving hole suffer wear and damage leading to slipping
Solution Approach 1:
The driving portion features driving recesses with specific local geometries (bevel faces at inclination angles, driving edges with included angles) that concentrate contact forces on specific regions of the damaged driving hole, optimizing engagement with the remaining intact material while avoiding further damage to surrounding areas
Solution Approach 2:
Instead of attempting to restore the damaged fastener, the invention inverts the approach by designing the driver to actively engage and utilize the damaged geometry of the driving hole. The bevel faces and driving edges are specifically shaped to mate with the deformed contours of a damaged hole, transforming the previously harmful wear patterns into functional engagement surfaces
2Ease of operation
If a fastener driver of mismatched size is used, then driving can be attempted, but the fastener wears and the driving hole becomes damaged
Solution Approach 1:
The driving recesses incorporate variable geometric parameters including bevel face inclination angles and driving edge included angles that can be adjusted to match different degrees and types of damage to the driving hole. This allows the driver to adapt to various mismatched conditions while maintaining effective engagement and preventing further geometric degradation
3Reliability
If the driving hole becomes nearly circular due to wear, then the fastener driver slips relative to the fastener, but effective driving is needed
Solution Approach 1:
The bevel faces of the driving recesses incorporate curved or angled surfaces that can engage with the circularized worn driving hole. The inclination angles of these bevel faces are specifically designed to provide mechanical interlocking even when the driving hole has lost its original hexagonal or recess geometry, preventing slippage through geometric constraint rather than relying on precise shape matching
Data Source
AI summary
An anti-slip fastener driver includes a shank and a driving portion formed on an end of the shank and defining a longitudinal axis. The driving portion includes an outer periphery surrounding the longitudinal axis and having a first peripheral face. An end of the driving portion opposite to the shank includes a first bevel face connected to the first peripheral face. The first bevel face includes a first side and a first corner opposite to the first side. The end of the driving portion opposite to the shank defines a reference plane perpendicular to the longitudinal axis. The first side is located on the reference plane. The first corner is located between the reference plane and the shank.