Multi-Grip Screw Bit for Slip-Resistant Torque Transfer
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Solution Overview
Problem
Existing fasteners often slip during tightening or loosening due to worn, corroded, or damaged heads, leading to damage and the need for unnecessary drilling with common bolt extractors.
Innovation Solution
A multi-grip screw bit design with segmented portions that engage the fastener head, allowing efficient torque transfer and preventing slippage, compatible with various torque tools.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional driver bits are used on worn, corroded, or damaged fastener heads, then the tool can be simple and easy to manufacture, but slippage occurs leading to fastener damage and requiring bolt extractors
Solution Approach 1:
The driver bit is divided into multiple segmented portions (protrusions) that can independently engage with the fastener head. These segments are positioned at different locations and angles to ensure at least one segment maintains contact with the fastener head during rotation, preventing slippage even when the head is worn, corroded, or damaged.
Solution Approach 2:
Different portions of the driver bit have different engagement characteristics. The segmented protrusions are designed with varying shapes, sizes, and orientations to match different fastener head conditions. This allows the bit to adapt locally to the specific condition of the fastener head being engaged.
2Reliability
If segmented portions are added to prevent slippage, then grip reliability improves, but the manufacturing complexity increases
Solution Approach 1:
The bit body is segmented into multiple protrusions that can be manufactured using standard machining processes. Each segment is a simple geometric feature that can be created with conventional tooling, avoiding the need for complex manufacturing methods while achieving reliable multi-point engagement with the fastener head.
3Adaptability or versatility
If conventional extractor tools are used to remove damaged fasteners, then the extraction function is provided, but unnecessary drilling and additional tools are required
Solution Approach 1:
The driver bit is designed to perform multiple functions: it can engage with intact fastener heads for normal tightening/loosening operations, and it can also engage with worn, corroded, or damaged fastener heads to prevent slippage and enable removal. This multi-functionality eliminates the need for separate extractor tools and drilling operations.
Solution Approach 2:
The segmented portions of the bit automatically adapt to the condition of the fastener head. When the head is damaged, the segments naturally position themselves to engage with the remaining sound portions of the head, providing self-adjusting engagement without requiring the user to select a different tool or perform preparatory drilling.
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 design effectively prevents slippage and damage to fasteners, eliminating the need for bolt extractors by ensuring secure grip and efficient torque application in both directions.
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
Data Source
AI summary
A screw bit body 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 first bracing surface, a second 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 screw bit body from the first base to the second base. The engagement cavity comprises a protrusion arranged between a first cavity section and a second cavity section.