Cover Anchor Clip Structure to Redirect Weld Lines
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Solution Overview
Problem
Existing cover anchor clips are prone to damage at weld lines due to these lines extending in the same direction, making them susceptible to breaking under external forces during injection molding.
Innovation Solution
The cover anchor clip design incorporates a plate thickness changing portion between the gate mark and through holes, causing weld lines to extend in different directions, thereby reducing the likelihood of damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If through holes are formed in the base section for foam body retention, then the clip can be securely retained in the foam body, but weld lines develop at the periphery of through holes and extend in the same direction, making the base section susceptible to breaking under external load
Solution Approach 1:
The invention introduces a plate thickness changing portion at a specific location (between the gate mark and through holes) to locally alter the resin flow pattern. This local structural modification causes weld lines from adjacent through holes to extend in different directions, thereby improving strength at critical locations without affecting the overall retention function provided by the through holes.
2Strength
If a plate thickness changing portion is introduced to alter weld line direction, then damage at weld lines is suppressed, but the structural complexity of the base section increases
Solution Approach 1:
The invention changes the thickness parameter of the base section at a specific location to control resin flow behavior during injection molding. By varying the thickness parameter, the weld lines are redirected to extend in different directions, improving strength without requiring additional components or complex structural modifications.
Data Source
AI summary
A cover anchor clip includes a base section having a plate shape extending in one direction, that is formed with through holes into which a foam body enters, and that is configured to be retained in the foam body; and an anchor portion including a pair of extension portions that extend upward from a surface of the base section and that are disposed facing each other, and a pair of anchor claws that are formed at respective leading ends of the pair of extension portions, and that is configured to anchor an anchored member attached to a cover for covering the foam body by sandwiching the anchored member therebetween. The through holes formed at the base section are aligned in the one direction, and plural hole-rows formed by the through holes aligned in the one direction are disposed separated by a spacing in an intersection direction intersecting the one direction. A gate mark that indicates an injection port for resin material during molding is formed at the back face of the base section between adjacent hole-rows. A plate thickness changing portion at which a thickness of the base section changes is formed between the gate mark and the through holes, as viewed from a back face of the base section along a plate thickness direction of the base section.