Retention Clip With Variable Pocket For Vehicle Molding
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Solution Overview
Problem
Conventional retention clips fail to securely attach exterior moldings to vehicle flanges due to varying mechanical tolerances in the hemmed sheet metal, leading to loose or tight fits, and struggle to maintain the molding's lip against the sheet metal, resulting in air and water leakage.
Innovation Solution
A retention clip with a tab and bump configuration that defines a pocket to accommodate the flange's variable thickness, providing a secure interlocking mechanism and maintaining the molding's lip against the sheet metal, while being adaptable for tight spaces and varying tolerances.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional clips are used to attach molding to the flange, then the molding can be retained, but the fit is inconsistent due to varying mechanical tolerances in the hemmed sheet metal, resulting in either loose or tight fits
Solution Approach 1:
The clip design incorporates a pocket with variable depth to accommodate different flange thicknesses. The pocket depth is designed to vary along its length, allowing the clip to adapt to the varying mechanical tolerances in the hemmed sheet metal while maintaining consistent retention of the molding.
Solution Approach 2:
The clip includes a resilient tab that can flex and deform elastically to accommodate tolerance variations in the flange hem. This dynamic element allows the clip to adjust to different flange thicknesses and maintain reliable engagement with the molding throughout the variable-depth pocket.
2Reliability
If conventional clips are used, then assembly can be performed, but significant force is required to install the clips due to tight interlocking engagement
Solution Approach 1:
The resilient tab is designed to flex during installation, allowing the clip to be inserted into the variable-depth pocket with reduced force. Once installed, the tab's elasticity provides continuous engagement force to maintain the molding retention, achieving both easy installation and strong interlocking.
Solution Approach 2:
The variable-depth pocket is designed with sufficient depth to accommodate the resilient tab's deformation during installation. This pre-designed clearance acts as a cushion that absorbs the installation force, preventing excessive stress during assembly while ensuring proper engagement.
3Reliability
If conventional clips are used, then the molding can be attached, but the lip of the molding is not securely maintained against the sheet metal, resulting in air and water leakage
Solution Approach 1:
The variable-depth pocket design ensures that the molding lip is maintained at a consistent position against the flange despite variations in flange thickness. This consistent positioning preserves the seal between the molding lip and the flange, preventing air and water infiltration.
4Reliability
If the interlocking engagement is made tight to improve retention, then the molding is securely retained, but the clip can only be installed by applying significant force
Solution Approach 1:
The resilient tab provides a dynamic engagement mechanism that requires minimal installation force while maintaining strong retention. The tab's elasticity allows it to flex during installation and then provide continuous engagement force, achieving both easy installation and secure retention.
Data Source
AI summary
A clip is disclosed for securing a molding to a flange of a vehicle. The clip has a first side wall and a second side wall each comprising an interior surface and an opposing exterior surface. The interior surfaces face one another and the exterior surfaces are shaped to engage the molding. Each of the side walls terminate at a distal edge providing a passage for the flange. A base connects the side walls at an end that is opposite the distal edges. A tab extends from the base and is disposed between the side walls. The tab and the interior surface of the second side wall define a pocket sized to fit the flange of the vehicle. The interior surface of the second side wall comprises a bump that extends towards and faces the tab. The tab and the bump are configured to engage the flange.