Segmented Fastener Extractor Splines Prevent Slippage
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Solution Overview
Problem
Traditional fastener extractors often experience slippage due to worn or damaged fasteners, corrosion, and overtightening, leading to inefficient torque transfer and risk of damaging internal threads during removal, especially when dealing with damaged or stripped fasteners.
Innovation Solution
A fastener extractor and dislodging tool apparatus featuring a torque-tool body with integrated splines that engage the fastener head to prevent slippage and a release bolt to dislodge stuck fasteners, ensuring efficient torque transfer and safe removal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional fastener extractors are used on damaged or stripped fasteners, then the tool may grip the fastener head, but slippage occurs leading to inefficient torque transfer
Solution Approach 1:
The extractor tool body is segmented with multiple extraction features (splines) that can independently engage with the fastener head. These segmented features distribute the gripping force across multiple contact points, preventing slippage and improving torque transfer efficiency when removing damaged fasteners
Solution Approach 2:
The extraction features act as an intermediary mechanism between the tool body and the fastener head. These features transfer torque from the tool to the fastener through a controlled engagement interface that maintains reliable grip even on damaged or stripped fasteners
2Ease of operation
If aggressive removal methods like drilling are used on seized fasteners, then the fastener can be dislodged, but there is a high risk of damaging the internal threads of the hole
Solution Approach 1:
The extraction features are designed to engage with damaged or stripped fastener heads, converting the previously harmful condition of fastener damage into a beneficial gripping surface. The splines mate with the damaged contours to create effective torque transfer, allowing removal without aggressive drilling that could harm internal threads
3Adaptability or versatility
If traditional extractors are used on corroded or overtightened fasteners, then the fastener can be accessed, but the tool slips on the head portion
Solution Approach 1:
The extraction features have locally optimized geometries with varying spline profiles that adapt to different fastener head conditions. Each extraction feature is designed with specific local qualities (tooth shape, spacing, depth) that maximize engagement with corroded, overtightened, or damaged fastener surfaces, preventing tool slippage
Data Source
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AI summary
A fastener extractor and dislodging tool apparatus includes a torque-tool body, a threaded opening, a plurality of engagement features, and a release bolt. The plurality of engagement features that grips the lateral surface of the stripped fastener is radially positioned around a rotation axis of the torque-tool body. The plurality of engagement features being perimetrically connected around a base of the torque-tool body thus delineating a socket body that removes the stripped fastener. The threaded opening traverses through the base so that the release bolt can be threadedly engaged with the threaded opening, opposite of the plurality of engagement features. When the stripped fastener is jammed within the plurality of engagement features, the release bolt can be threadedly moved into the space between the plurality of engagement features thus dislodging the stripped fastener from the torque-tool body.