Anti-Slip Fastener Remover Structure for Stripped Head Extraction

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Solution Overview

Problem

Existing fastener removal tools often slip due to worn, corroded, or damaged fastener heads, leading to inefficient torque transfer and potential damage to internal threads.

Innovation Solution

An anti-slip fastener remover tool with integrated engagement segments that bite into the lateral sides of the fastener head, ensuring efficient torque transfer and preventing slippage during tightening or loosening.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If traditional wrenches are used to tighten or loosen fasteners, then the operation is simple and effective for intact fasteners, but the tool slips on worn, corroded, or damaged fastener heads causing loss of torque transfer and potential damage

Engineering Contradiction:

Improvetorque transfer reliabilityVSAvoidtool slippage prevention

Core Design Contradiction:

ReliabilityVSEase of operation

Solution Approach 1:

The fastener removal tool divides the engagement interface into multiple segmented jaws (typically three or more) that independently contact the fastener head. Each jaw can flex and conform to the fastener surface, distributing the engagement force across multiple points rather than relying on a single contact point, thereby preventing slippage on damaged or corroded fasteners

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The engagement jaws are designed with non-uniform geometry and material properties - the outer surfaces are hardened and textured to maximize friction and grip on the fastener head, while the inner portions remain flexible to conform to irregular fastener geometries. This local differentiation of properties enables reliable engagement with damaged fasteners without sacrificing overall tool strength

Inventive Principle:

Principle #3Local quality

2Strength

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

Engineering Contradiction:

Improvefastener extraction capabilityVSAvoiddamage to internal threads

Core Design Contradiction:

StrengthVSObject-affected harmful factors

Solution Approach 1:

The tool applies preliminary counter-forces through its balanced jaw design that distribute extraction forces evenly around the fastener head. This prevents concentrated stresses that could transmit damaging forces to the internal threads, allowing the fastener to be removed without compromising the integrity of the threaded hole

Inventive Principle:

Principle #9Preliminary anti-action

Solution Approach 2:

The tool is designed to engage with and utilize the existing damaged or corroded surfaces of the fastener head rather than requiring intact surfaces. The segmented jaws conform to and grip irregular geometries, converting what would normally be harmful conditions (corrosion, damage, seizure) into effective engagement points for torque application

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

3Reliability

If multiple engagement segments are integrated into the tool to bite into the fastener head, then slippage is prevented and torque transfer is efficient, but the tool structure becomes more complex

Engineering Contradiction:

Improveslippage preventionVSAvoidtool structure complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The tool merges the functions of multiple independent fastener engagement elements into a single integrated body. The segmented jaws are permanently attached to and move with the tool body as one unit, eliminating the need for separate adjustable components or multiple tools while maintaining the slippage-prevention benefits of multi-point engagement

Inventive Principle:

Principle #5Merging (Combining)

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 tool effectively prevents slippage and damage to fasteners by engaging the lateral sides, allowing for efficient rotation and extraction without damaging the fastener or its threads.

Implementation Method 1

integrated engagement segments that bite into the head portion of the fastener and allow for efficient torque transfer between the extractor bit and the head portion of the fastener

Methodology Applied

Scientific EffectFriction: Friction

Data Source

PatentUS12515302B2Anti-slip fastener remover tool

Publication Date: 2026.01.06 GRIP HLDG LLC

AI summary

An anti-slip fastener remover tool includes a torque-tool body, a plurality of paired engagement features, and a plurality of intersection points. The plurality of paired engagement features that grips the lateral surface of the stripped fastener head is radially positioned around a rotation axis of the torque-tool body. The torque-tool body is inwardly extended from an outer wall of the torque-tool body to the plurality of paired engagement features. Each paired engagement feature comprises a first engagement feature and a second engagement feature. The first engagement feature and the second engagement feature each comprise a bracing section, a cavity section, and a connector section. The cavity sections of the first and second engagement features are adjacently connected to each other. The bracing sections of the first and second engagement feature are oppositely positioned about the cavity sections of the first and second engagement features.