Alternating Snap-in Clips for Vehicle Cover Fatigue
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Solution Overview
Problem
Existing plastic covers for motor vehicle paneling recesses suffer from age-related material fatigue, leading to broken locking elements and compromised opening and closing functions, and previous solutions are limited by material restrictions and increased costs due to reinforcement requirements.
Innovation Solution
A fastening system featuring thermoplastic covers with a lowered support edge and alternately arranged snap-in clips that distribute forces evenly across the latching edges, reducing wear and enhancing the service life of locking elements, allowing for secure and easy access to functional elements without compromising holding forces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If plastic covers with locking elements are used for motor vehicle paneling recesses, then the covers are easily accessible and have simple opening and closing mechanisms, but age-related material fatigue occurs and breaks occur on the locking elements after a few years
Solution Approach 1:
The locking system is segmented into multiple locking clips distributed around the cover perimeter, with each clip engaging a separate locking opening. This distributes the mechanical stress across multiple points rather than concentrating it on a single locking element, thereby reducing material fatigue and extending service life while maintaining simple operation.
Solution Approach 2:
The locking clips are positioned at different distances from the cover edge, creating alternating force application points on the upper and lower locking edges of the paneling. This local variation in clip positioning optimizes force distribution and reduces stress concentration on any single locking opening, improving overall system reliability.
2Reliability
If reinforcement materials are added to plastic to increase strength and durability, then the locking elements can withstand material fatigue better, but the cost of the component increases
Solution Approach 1:
Instead of reinforcing the entire plastic cover with expensive materials, the design uses multiple simple locking clips that distribute loads. This segmented approach achieves the required strength and durability through structural configuration rather than material reinforcement, avoiding increased component costs.
Solution Approach 2:
The invention changes the geometric parameters of the locking clips, particularly their positioning at alternating distances from the cover edge. This parameter optimization allows standard plastic materials to achieve sufficient durability through optimal force distribution, eliminating the need for costly reinforcement materials.
3Reliability
If multiple locking clips are arranged to distribute forces evenly, then the service life of locking clips is increased, but the device complexity increases
Solution Approach 1:
The locking system is divided into multiple simple clip units, each performing the same basic function of engaging a locking opening. This segmentation into identical or similar components simplifies manufacturing and assembly while achieving force distribution, as each clip is a standardized element rather than a complex unique structure.
Solution Approach 2:
Each locking clip serves multiple functions: it provides mechanical engagement with a locking opening, distributes force away from the cover center, and contributes to overall structural stability. This multi-functionality of simple universal components achieves reliability without increasing device complexity.
Data Source
Figure 1~2B
AI summary
The system has a lining (2) including a lowered supporting rim (3) with evenly arranged locking openings (5) in a boundary region of a recess. A cover (1) has corresponding locking clips (4) as locking elements formed directly on a lower surface (6) for engaging into the openings. The clips are arranged alternatingly with different distances of an edge of cover, so that forces act on upper or lower locking edges (7, 8) of the openings. The cover and the lining are made of a thermoplastic plastic containing reinforcement additive e.g. glass and carbon fibers, and filter media i.e. talcumpowder. The thermoplastic plastic is selected from a group consisting of polypropylene, polyethylene, polystyrene, PVC, polycarbonate, Polybutyleneterephthalate, Polyacrylnitrile, polymethyl methacrylate, Acrylnitrile butadiene styrene, Acrylnitrile butadiene Styrol/Polycarbonate Copolymerisate, Polyphenylether, styrene acrylonitrile and/or Polyoxymethylene.