Adjustable Locking Insert Fastener With Toolless Clip Actuation

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Solution Overview

Problem

Existing quarter-turn fasteners face challenges with locking mechanisms that require separate tools for axial positioning of the insert, leading to issues like corrosion and difficulty in manipulation, especially in tight spaces.

Innovation Solution

A fastener assembly with a spring-loaded retainer clip and actuator mechanism that allows for tool-less locking and unlocking of the insert within the receptacle, using cam surfaces and a retainer clip to adjust the insert's axial position without the need for additional tools.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a spring-loaded band is used for locking the insert, then the insert can be locked in position, but the band is subject to cracking and corrosion at the bend and requires difficult manipulation in tight spaces

Engineering Contradiction:

Improvelocking mechanism durabilityVSAvoidmanipulation difficulty

Core Design Contradiction:

ReliabilityVSEase of operation

Solution Approach 1:

The invention extracts the problematic bent section from the locking mechanism by using a straight band with a separate actuator system. The band remains straight and is manipulated through a slot in the receptacle, eliminating the bend that caused cracking and corrosion while maintaining the locking function through cam surfaces that engage with the band.

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The invention introduces an actuator as an intermediary component that facilitates band manipulation. The actuator with its cam surfaces provides a mechanical advantage system that allows the band to be moved easily through the slot without requiring direct manipulation of the band itself, solving both the durability and ease of operation issues.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Ease of operation

If a pick tool is used to manipulate the spring-loaded band, then the band can be moved for locking, but the pick is difficult to manipulate in small or tight places

Engineering Contradiction:

Improvelocking mechanism operabilityVSAvoidtool requirement

Core Design Contradiction:

Ease of operationVSDevice complexity

Solution Approach 1:

The invention merges the actuator and band manipulation functions into a single integrated component that operates through the receptacle slot. The actuator combines the functions of a tool handle and cam mechanism, eliminating the need for a separate pick tool while providing easy manipulation through the slot opening.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The actuator serves multiple functions: it acts as a manipulation tool, provides mechanical advantage through cam surfaces, and interfaces with the band through the receptacle slot. This multi-functional design eliminates the need for separate specialized tools while maintaining operability in tight spaces.

Inventive Principle:

Principle #6Universality (Multi-functionality)

3Adaptability or versatility

If the insert is made adjustable axially within the receptacle, then varying panel thicknesses can be accommodated, but a locking mechanism is required to lock the insert in position

Engineering Contradiction:

Improvepanel thickness accommodationVSAvoidlocking mechanism addition

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The band and cam surface combination provides self-locking functionality. As the insert is rotated to adjust its axial position, the cam surfaces automatically engage with the band to lock the insert in place without requiring a separate locking mechanism. The system locks itself through the inherent geometry of the cam and band interaction.

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

Facilitates easy and reliable axial positioning of the insert within the receptacle, enhancing usability and durability by eliminating the need for separate tools and reducing corrosion risks.

Implementation Method 1

The retainer clip is preferably configured to apply a spring-loaded compressive force against the body of the actuator

Methodology Applied

Scientific EffectSpring-loaded compressive force: Spring

Implementation Method 2

the actuator is rotatable about the receptacle in a first direction to move the first end of the retainer clip out of the channel of the insert to an unlocked position

Methodology Applied

Scientific EffectRadial movement through rotation: Cam

Data Source

PatentUS20260071640A1Fastener with adjustable locking insert

Publication Date: 2026.03.12 BOWERS NED C

AI summary

A fastener assembly for securing together two components such as two panels. The assembly includes an externally threaded insert that is rotatably adjustable within an internally threaded receptacle on a nut plate. A toolless locking mechanism of the assembly includes a retainer clip that interfaces with a rotatable actuator on the receptacle to move a tab end of clip in and out of engagement with the insert to unlock the insert for rotation in the receptacle or lock the insert to prevent rotation thereof in the receptacle.