Fastener Holder With Offset Arms Reduces Pivot Nut Wobble

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Solution Overview

Problem

Conventional fasteners with pivot nuts tend to experience wobbling movements and excessive pushing force, leading to potential cracking or breakage of the pivot nut and internal thread due to direct application of force from the threaded member.

Innovation Solution

The holder is designed with arm plates positioned at different distances from the center axis of the threaded member insertion hole, allowing the threaded member to engage an intermediate portion of the holder, reducing wobbling and distributing the pushing force, thereby preventing excessive stress on the pivot nut.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of operation

If the pivot nut is held with slight play by the holder, then the pivot nut can pivot and move freely, but wobbling movement occurs and excessive pushing force damages the pivot nut

Engineering Contradiction:

Improvepivotability of pivot nutVSAvoidstructural integrity of pivot nut

Core Design Contradiction:

Ease of operationVSReliability

Solution Approach 1:

The threaded member insertion hole in the flange plate serves as an intermediary structure that engages the threaded member during insertion. This intermediary engagement provides guiding and support functions, preventing excessive wobbling of the pivot nut while still allowing necessary movement, thus resolving the contradiction between pivotability and structural integrity

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The threaded member insertion hole is pre-formed in the flange plate at a position that ensures proper engagement with the threaded member before the pivot nut is fully inserted. This preliminary structural arrangement guides the threaded member and pivot nut into correct alignment, preventing damaging wobbling movements from the outset

Inventive Principle:

Principle #10Preliminary action

2Ease of operation

If the threaded member insertion hole has a larger diameter than the threaded member, then smooth insertion is achieved, but wobbling movement increases

Engineering Contradiction:

Improvesmoothness of threaded member insertionVSAvoidstability of threaded member position

Core Design Contradiction:

Ease of operationVSStability of the object's composition

Solution Approach 1:

The threaded member insertion hole is positioned locally in the flange plate at an optimized location that balances insertion ease with stability. The hole's diameter is sufficiently large for smooth insertion but its position creates a lever arm effect that reduces wobbling, providing local quality optimization rather than uniform design

Inventive Principle:

Principle #3Local quality

3Ease of manufacture

If the pivot nut is formed by die-casting, then manufacturing efficiency is improved, but the pivot nut is prone to cracking under excessive force

Engineering Contradiction:

Improvemanufacturing efficiency of pivot nutVSAvoidcrack resistance of pivot nut

Core Design Contradiction:

Ease of manufactureVSStrength

Solution Approach 1:

The flange plate with threaded member insertion hole provides beforehand cushioning by engaging the threaded member during insertion. This cushioning effect absorbs and distributes the insertion force, preventing excessive concentrated force from reaching the die-cast pivot nut, thus protecting it from cracking while maintaining manufacturing efficiency

Inventive Principle:

Principle #11Beforehand cushioning (Prior cushioning)

Data Source

PatentUS10859110B2Holder of a fastener

Publication Date: 2020.12.08 WAKAI & CO LTD

AI summary

A holder is provided to be used with a fastener that includes a pivot nut. The holder includes a flange plate, and a pair of substantially U-shaped arm plates disposed on respective opposite sides of the flange plate. The arm plates hold the pivot nut so that the pivot nut is pivotable and movable relative to the flange plate. The flange plate has a threaded member insertion hole through which a threaded member is inserted. The two arm plates are arranged at different distances from the center axis of the threaded member insertion hole.