Blind Hole Fastener With Tactile Arm Feedback for Full Seating

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Solution Overview

Problem

Challenges exist in confirming proper installation of blind hole fasteners, particularly in environments where visual inspection is impractical or impossible, leading to issues like insufficient retention and unwanted movement under dynamic loads or vibrations.

Innovation Solution

A blind hole fastener design that provides tactile and/or audible feedback through resilient verification arms, which engage upon full insertion to confirm proper seating.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of operation

If blind hole fasteners are used in limited access environments, then installation convenience is improved, but installation verification becomes difficult

Engineering Contradiction:

Improveinstallation convenienceVSAvoidinstallation verification

Core Design Contradiction:

Ease of operationVSDifficulty of detecting and measuring

Solution Approach 1:

The patent incorporates verification arms with tactile feedback features that provide immediate sensory confirmation to the installer. When the fastener is fully inserted, the verification arms engage with the workpiece and produce a detectable tactile signal (such as a click or resistance change), enabling the installer to verify proper installation without visual inspection. This feedback mechanism directly resolves the contradiction by making installation verification possible in limited access environments.

Inventive Principle:

Principle #23Feedback

2Measurement precision

If visual inspection is required for installation verification, then measurement precision is improved, but ease of operation deteriorates

Engineering Contradiction:

Improveinstallation verification accuracyVSAvoidinstallation convenience

Core Design Contradiction:

Measurement precisionVSEase of operation

Solution Approach 1:

The patent replaces the visual inspection mechanism with a tactile feedback system. Instead of requiring the installer to visually confirm proper fastener insertion, the verification arms provide mechanical/tactile feedback through engagement features that produce detectable physical signals (clicks, resistance changes, or positional feedback). This substitution maintains verification accuracy while eliminating the need for visual access, thereby improving ease of operation in limited access environments.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

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

Ensures reliable and efficient installation verification, enhancing user confidence and reducing long-term reliability issues by providing perceptible feedback.

Implementation Method 1

resilient verification arms, which engage upon full insertion to confirm proper seating

Methodology Applied

Scientific EffectElasticity: Elasticity

Data Source

PatentUS20260029014A1Double Arm Blind Hole Fastener

Publication Date: 2026.01.29 ILLINOIS TOOL WORKS INC

AI summary

A fastener assembly designed to attach two components together by inserting it into an opening in the second component. The fastener assembly includes a fastener and a collar with two surfaces. Extending from one surface of the collar of the fastener assembly are two upper arms and two lower arms, each of which can flex inward during installation. When the fastener is fully inserted, the ends of the upper and lower arms within a pair make contact with each other to give the user a physical or audible indication that installation is complete.