Anti-Slippage Fastener Head Structure to Prevent Tool Slip
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Solution Overview
Problem
Existing fasteners often experience slippage issues due to worn components, corrosion, or overtightening, leading to damage and the need for unnecessary tools like bolt extractors for removal.
Innovation Solution
An anti-slippage fastener design featuring a head with radially distributed engagement walls and a partially-circular interlocking feature that prevents slippage and efficiently transfers torque, eliminating the need for common bolt extractors and reducing damage during tightening or loosening.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If traditional hex head fasteners are used with power tools, then tightening and loosening operations can be performed efficiently, but slippage occurs due to worn components, corrosion, or overtightening, leading to damage and the need for bolt extractors
Solution Approach 1:
The fastener head is segmented into multiple engagement walls (at least three) that are radially distributed around the rotation axis. Each engagement wall has a partially-circular portion that creates discrete bite points for the torque tool, distributing the slippage resistance across multiple segments rather than relying on a single contact surface. This segmentation allows the fastener to maintain grip even if one engagement point becomes worn or damaged.
Solution Approach 2:
Each engagement wall features an asymmetric profile with a partially-circular portion that has a specific curvature radius relationship to the fastener head's outer radius. The asymmetric geometry creates optimized bite points that engage the torque tool bit at specific angles, maximizing friction and mechanical interlocking while preventing slippage during both tightening and loosening operations.
2Productivity
If higher torque is applied to tighten or loosen fasteners, then faster operation is achieved, but the head portion becomes damaged or stripped
Solution Approach 1:
The engagement walls with partially-circular portions are pre-configured to create optimal bite points before torque is applied. This preliminary geometric arrangement ensures that when torque is applied, the force is immediately distributed across multiple engagement points rather than concentrating stress at a single location, preventing head damage even during high-torque operations.
Solution Approach 2:
The multiple radially-distributed engagement walls act as a cushioning system that distributes and absorbs torque stresses before they can concentrate and cause damage. The partially-circular portions of the engagement walls create a mechanical interlocking effect that cushions the head portion against peak torque loads, preventing stripping and damage during high-speed tightening or loosening operations.
3Ease of manufacture
If conventional fastener heads are used, then manufacturing is simple and cost-effective, but slippage requires additional tools like bolt extractors and drilling operations
Solution Approach 1:
The engagement walls with partially-circular portions are designed to be compatible with standard torque tool bits, making the fastener universally applicable with existing power tool inventories. The geometry is optimized to work with conventional hex holder bits while eliminating the need for specialized extractors or drilling operations, achieving multi-functionality without increasing tool requirements.
Data Source
AI summary
An anti-slippage fastener that utilizes a plurality of engagement features to prevent slippage and facilitate torque transfer between a torque-tool and the fastener. The fastener includes a shank, a fastener head, and an external threading. The fastener head includes a rotation axis and a plurality of engagement walls; wherein the engagement walls are radially distributed about the rotation axis. Each of the engagement walls includes a first transversal line, a second transversal line, and a partially-circular portion. The first transversal line is terminally connected to the partially-circular portion. The second transversal line is terminally connected to the partially-circular portion, opposite the first transversal line. A center of the partially-circular portion is oriented away from the rotation axis. The shank is concentrically connected to the fastener head to act as the body of the fastener. The external threading is laterally connected along the shank, similar to traditional fasteners.