Automotive Clip With Space-Limiting Portions For Oblique Retention
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Solution Overview
Problem
Existing clips for attaching automobile interior parts to instrument panels lack sufficient retention force when subjected to oblique extraction forces, leading to easy disengagement and removal.
Innovation Solution
The clip design incorporates space-limiting portions on the engagement legs, which close the spaces between the legs and the coupling rib when an oblique force is applied, preventing uneven flexing and ensuring the clip remains securely attached, even when pulled obliquely.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the engagement legs are made elastically deformable to enable insertion into the attaching hole, then the ease of installation is improved, but the retention force against oblique extraction forces deteriorates
Solution Approach 1:
The engagement legs are designed with non-uniform cross-sectional shapes that create localized rigid portions and flexible portions. The rigid portions (with larger second dimension values) resist oblique extraction forces, while the flexible portions (with smaller second dimension values) allow elastic deformation during insertion. This local differentiation of mechanical properties resolves the contradiction between ease of installation and retention force.
Solution Approach 2:
The engagement legs employ asymmetric cross-sectional geometry where the second dimension varies along the length of the legs. This asymmetric design creates zones of different stiffness, allowing the legs to flex asymmetrically during insertion while maintaining symmetric engagement with the attaching hole. The asymmetric structure enables differential flexibility that resolves the contradiction between deformability and retention force.
2Ease of operation
If the engagement legs are made highly flexible to facilitate easy insertion, then the ease of operation is improved, but the reliability of attachment deteriorates
Solution Approach 1:
The engagement legs incorporate localized rigid portions with enhanced second dimension values at strategic positions to maintain attachment reliability, while other portions retain higher flexibility for easy insertion. This local quality differentiation ensures that flexibility and reliability are both achieved in different zones of the same component.
Solution Approach 2:
The engagement legs are effectively segmented into multiple functional zones along their length, with each zone having different second dimension values that correspond to different mechanical requirements. This segmentation allows the legs to perform multiple functions (flexing during insertion, resisting extraction forces) within a single continuous component.
3Manufacturing precision
If uniform cross-sectional dimensions are used for the engagement legs, then the manufacturing precision is improved, but the retention force against oblique forces deteriorates
Solution Approach 1:
The engagement legs employ non-uniform cross-sectional dimensions with specifically controlled second dimension values at different locations. This local quality variation creates the necessary mechanical property gradients to resist oblique forces while maintaining manufacturability through precise dimensional control at key locations.
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
The clip maintains a strong retention force against both normal and oblique extraction forces, preventing unintended removal and ensuring the interior part remains securely attached to the instrument panel.
Implementation Method 1
a pair of engagement legs continuous with the head portion and elastically deformable inward and outward about the head portion
Implementation Method 2
space-limiting portions that are respectively formed in inner surfaces of the engagement legs along the second bent portions
Implementation Method 3
the engagement legs are restored or flexed outwardly, so that the shoulder portions 415 can elastically engage a periphery of the attaching hole 430
Data Source
AI summary
A clip may have a clip main body that is configured to be coupled to a coupling rib of an attachment base formed in an attaching article and to be inserted into an attaching hole formed in an object member. The clip main body may include a head portion, a pair of engagement legs continuous with the head portion and elastically deformable inward and outward about the head portion, and a pair of retainer members continuous with the head portion and respectively configured to engage the coupling rib of the attachment base. The engagement legs respectively have first bent portions, second bent portions, and engagement portions positioned between the first and second bent portions and configured to engage an inner peripheral edge of the attaching hole. The engagement legs respectively have space-limiting portions that are respectively formed in inner surfaces thereof along the second bent portions thereof.