Keyhole Fastening Device Anti-Twist Support Element
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Solution Overview
Problem
The keyhole principle for fastening components to a vehicle body lacks effective anti-twist protection during assembly, which can lead to improper component alignment and function failure if the component twists during assembly.
Innovation Solution
A fastening device with a retaining element and at least one support element that engages through the wider opening of a keyhole-shaped cutout, providing lateral support against the edge of the wider opening to prevent twisting and falling out, and an optional locking element for additional retention.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the keyhole principle is used for fastening components, then cost is reduced and one-hand assembly is enabled, but anti-twist protection is insufficient during assembly
Solution Approach 1:
The fastening device is divided into distinct functional elements: a retaining element for securing the component, and separate support elements for anti-twist protection. This segmentation allows each element to perform its specific function effectively while maintaining the overall simplicity and cost-effectiveness of the keyhole fastening system.
Solution Approach 2:
The support elements act as intermediary components between the fastening device and the keyhole opening. These elements provide the necessary anti-twist protection by engaging with the lateral edges of the keyhole, preventing rotational movement during assembly without requiring complex additional mechanisms.
2Reliability
If support elements are added to provide anti-twist protection, then reliability is improved, but device complexity increases
Solution Approach 1:
The support elements are designed to provide anti-twist protection only at the critical locations where twisting occurs during assembly. By concentrating the protective function at these specific points rather than throughout the entire fastening device, the solution maintains simplicity while effectively addressing the reliability issue.
Solution Approach 2:
Instead of making the entire fastening device complex to prevent twisting, the invention uses simple support elements that passively engage with the keyhole structure. The anti-twist protection is achieved by the geometric interaction between the support elements and the keyhole opening rather than through complex active mechanisms.
Data Source
AI summary
A fastening device for fastening an element in a keyhole-shaped cutout in a wall includes a retaining element which in the fastened state of the fastening device is designed to rest against a front side of the wall, and to at least partially cover an edge of a narrower opening of the key-shaped section in a wall. The fastening device also includes a support element which in the fastened state of the fastening device is designed to engage through a wider opening of the keyhole-shaped cutout in the wall, and to support the fastening device against a lateral edge of the wider opening during fastening.