Multi-Grip Screw Bit Structure for Stripped Hex Fasteners
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Solution Overview
Problem
Existing fastener tools often slip or strip when tightening or loosening hex bolts and nuts due to wear, corrosion, or overtightening, leading to damage and the need for unnecessary drilling with bolt extractors.
Innovation Solution
A multi-grip screw bit with segmented portions that bite into the fastener head, providing efficient torque transfer and eliminating slippage, compatible with various torque tools, and featuring a double-sided design for both clockwise and counterclockwise rotation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional driver bits are used on hex bolts and nuts, then the tool can apply torque to tighten or loosen fasteners, but the tool slips or strips on the head portion due to wear, corrosion, or overtightening
Solution Approach 1:
The driver bit is divided into multiple segmented portions (first portion, second portion, third portion) with different geometries. Each segment is designed to engage with the fastener head in a specific way, allowing the tool to adapt to worn, corroded, or damaged fasteners while maintaining secure engagement and preventing slippage.
Solution Approach 2:
Different portions of the driver bit have different local qualities - the first portion has a hexagonal shape for standard engagement, the second portion has a square shape for alternative engagement, and the third portion has a pointed tip for insertion into damaged fasteners. This local differentiation allows the tool to effectively handle various fastener conditions without causing damage.
2Productivity
If bolt extractors are used to remove damaged fasteners, then the damaged fastener can be extracted, but unnecessary drilling and additional tools are required
Solution Approach 1:
The driver bit is designed as a universal tool that can perform multiple functions: tightening standard fasteners, loosening damaged fasteners, and extracting broken bolts. The multiple portions allow the same tool to replace several specialized tools including driver bits, bolt extractors, and drilling equipment, thereby simplifying the toolset while maintaining productivity.
Solution Approach 2:
The invention combines the functions of multiple tools (driver bit, bolt extractor, drilling tool) into a single multi-portion driver bit. By integrating these capabilities into one tool, the invention eliminates the need for separate drilling operations and multiple specialized tools, reducing device complexity while maintaining the ability to remove damaged fasteners.
3Adaptability or versatility
If single-sided driver bits are used, then the tool can apply torque in one direction, but it cannot tighten or loosen fasteners in both directions
Solution Approach 1:
The driver bit incorporates both a first portion and a second portion with different geometries (hexagonal and square shapes) that can engage with the fastener head to apply torque in opposite directions. This allows the single tool to perform both tightening and loosening operations without requiring tool changes or repositioning, enhancing adaptability and ease of operation.
Solution Approach 2:
The driver bit is designed with portions that can engage the fastener head in inverted orientations - the first portion engages for one direction of rotation while the second portion engages for the opposite direction. This inverted engagement capability allows bidirectional torque application from a single tool position, improving operational convenience.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The multi-grip screw bit effectively prevents slippage and damage, eliminating the need for bolt extractors by providing superior torque transfer and adaptability to different fastener types, enhancing tool longevity and ease of use.
Implementation Method 1
The design uses a series of segmented portions that bite into the head of the fastener and allow for efficient torque transfer between the driving bit and the head portion of the fastener
Implementation Method 2
The present invention is a driving bit design that virtually eliminates slippage
Data Source
AI summary
A screw bit body which allows for efficient torque force application onto a socket fastener. The screw bit body includes a plurality of laterally-bracing sidewalls, a first base, and a second base. The laterally-bracing sidewalls are radially distributed about a rotation axis of the screw bit body with each further including a first lateral edge, a second lateral edge, a bracing surface, and an engagement cavity. The engagement cavity creates an additional gripping point to prevent slippage in between the screw bit body and the socket fastener. The engagement cavity traverses normal and into the bracing surface. Additionally, the engagement cavity traverses into the screw bit body from the first base to the second base. The engagement cavity is specifically positioned offset from the first lateral edge by a first distance.