Housing Fit Structure With Root-Positioned Nail
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Solution Overview
Problem
Conventional housing fit structures are prone to disassembly under impact due to deformation and bending of fit projection parts, leading to easy separation of the housing halves.
Innovation Solution
A housing fit structure featuring a fit projection piece with a tongue at the tip, a presser part, and an engaging piece, where the nail and nail holder are located near the root of the projection piece, allowing the tongue to guide the fit projection piece into the groove and enhance engagement strength, preventing disassembly under load.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If nails are located at the tips of fit projection parts, then ease of assembly is improved, but reliability deteriorates under impact load
Solution Approach 1:
The nail position is moved from the tip (one-dimensional endpoint) to the root (one-dimensional origin) of the fit projection part, utilizing the root area as a new functional dimension that provides both assembly guidance and impact resistance
Solution Approach 2:
The fit projection part is segmented into distinct functional zones: the tip area contains the fit tongue for guidance, while the root area contains the nail for secure attachment, separating the guidance function from the anchoring function
2Ease of operation
If fit grooves are made shallow for easy insertion, then ease of assembly is improved, but reliability deteriorates under load
Solution Approach 1:
The fit groove is extended in depth (third dimension) to accommodate the nail at the root of the fit projection part, creating a deep groove structure that provides both easy insertion at the opening and secure retention at the bottom
3Ease of operation
If elastic pieces are used to spread fit groove widths, then ease of assembly is improved, but reliability deteriorates under impact
Solution Approach 1:
The elastic pieces are removed from the fit groove structure entirely, extracting the problematic element that caused reliability deterioration while preserving the deep groove design that provides both ease of assembly and impact resistance
Data Source
AI summary
Fit structure of a housing formed of first and second halves is provided. The first half has a fit projection piece having a fit tongue at the tip. The second half has a presser part and an engaging piece constituting a fit groove. The fit projection piece, presser part and engaging piece are formed so that the fit tongue is positioned in the inner part of the fit groove along the root of the presser part. The housing further has a nail stuck out in an inward or outward direction of the housing and a nail holder engaged with the nail. The nail and nail holder are located at one and the other of a part of the fit projection piece and a corresponding part of the engaging piece. The part of the fit projection piece is nearer to the root of the fit projection piece than the fit tongue.