Blind Hole Fastener Click Verification for Secure Seating

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Solution Overview

Problem

Challenges exist in confirming proper installation of blind hole fasteners without visual inspection, leading to potential retention issues and reliability concerns under dynamic loads or vibrations.

Innovation Solution

A blind hole fastener design providing tactile and/or audible feedback through resilient verification arms that engage upon full insertion, ensuring secure seating with snap features and cut-out features for user confirmation.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of operation

If blind hole fasteners are used in applications with limited access, then installation simplicity is improved, but installation verification becomes difficult

Engineering Contradiction:

Improveinstallation simplicityVSAvoidinstallation verification

Core Design Contradiction:

Ease of operationVSDifficulty of detecting and measuring

Solution Approach 1:

The patent implements feedback mechanisms including resilient verification arms that provide tactile feedback through engagement clicks, and audible feedback through clicking sounds when the fastener is properly installed. This allows the installer to confirm proper installation without visual inspection, resolving the contradiction between ease of installation and difficulty of verification in blind hole applications

Inventive Principle:

Principle #23Feedback

2Measurement precision

If visual inspection is required to confirm proper seating, then installation verification accuracy is improved, but installation time and complexity increase

Engineering Contradiction:

Improveinstallation verification accuracyVSAvoidinstallation time

Core Design Contradiction:

Measurement precisionVSLoss of time

Solution Approach 1:

The fastener performs self-verification through its own structural features. The resilient verification arms automatically engage with corresponding features on the fastener body during installation, providing immediate tactile and audible feedback that confirms proper seating without requiring external visual inspection tools or procedures, thus maintaining high verification accuracy while minimizing additional time

Inventive Principle:

Principle #25Self-service

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 preventing unintended disengagement by providing tactile and/or audible feedback.

Implementation Method 1

resilient verification arms that engage upon full insertion

Methodology Applied

Scientific EffectElasticity: Elasticity

Implementation Method 2

provide tactile feedback and/or audible feedback

Methodology Applied

Scientific EffectMechanical vibration: Vibration

Data Source

PatentUS20260029007A1Blind Hole Fastener with Clicking

Publication Date: 2026.01.29 ILLINOIS TOOL WORKS INC

AI summary

A fastener assembly to attach a first part to a second part through a hole in the second part. The assembly includes a fastener that fits into the hole and a collar connected to the fastener. The collar has two sides, and from one side, two upper verification arms extend. Two lower verification arms extend from the fastener. Both sets of arms can bend when the fastener is inserted. When the fastener is fully inserted, snap features on the ends of the lower arms are designed to snap into matching cut-out features on the ends of the upper arms. This snapping action gives the user an audible feedback to indicate that the fastener is in the right position.