Self-Retaining Door Edge Guard with Elastic Throat
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Solution Overview
Problem
Existing door edge guards for automotive vehicles often disrupt the finish and construction of finished doors during installation, and they may not effectively conform to the complex contours of vehicle door edges, leading to inadequate self-retention.
Innovation Solution
A door edge guard design featuring a metal strip with a specific transverse cross-section and non-metallic layer configuration, allowing for elastic deformation and self-retention without fasteners or adhesives, which conforms to the contours of vehicle door edges and maintains a secure grip through a throat opening mechanism.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a door edge guard is installed on a finished door edge, then the trailing edge is protected from damage, but the installation may disrupt the door construction and mar the paint finish
Solution Approach 1:
A non-metallic layer is applied as an intermediary between the metal door edge guard and the finished door edge. This layer prevents direct contact between the metal guard and the paint finish, eliminating marring during installation while the metal guard provides structural protection. The non-metallic layer acts as a mediator that allows the guard to function without harming the finished surface.
Solution Approach 2:
The non-metallic layer is applied to the door edge guard surfaces in advance, before installation on the vehicle door. This preliminary coating ensures that when the guard is installed, the protective function is already in place, preventing any potential damage to the paint finish or door construction during the installation process.
2Reliability
If traditional door edge guards are used, then self-retention is achieved through elastic deformation, but the guards cannot effectively conform to complex door edge contours
Solution Approach 1:
The door edge guard incorporates a dynamic cross-sectional design with a throat opening that can deform elastically during installation. The cross-section transitions from an open throat configuration to a closed configuration as the guard is pressed onto the door edge, allowing the guard to adapt to varying door edge contours while maintaining self-retention force through elastic recovery.
Solution Approach 2:
The guard's cross-sectional parameters change during installation - the throat opening dimension decreases as the guard deforms onto the door edge contour, and then elastic recovery maintains a constant retention force. This parameter change allows the guard to conform to different door edge geometries while preserving the self-retention mechanism.
3Reliability
If the door edge guard cross-section is expanded during installation, then self-retention force is developed, but the throat opening must be small initially which complicates installation
Solution Approach 1:
The throat opening is designed to be dynamically adjustable during installation. Initially open to allow easy insertion onto the door edge, the throat then closes as elastic deformation develops self-retention force, and finally maintains a controlled opening to preserve the retention mechanism. This dynamic behavior resolves the contradiction between initial accessibility and final retention.
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 solution ensures secure self-retention of the door edge guard on the vehicle door without damaging the finish or disrupting the door's construction, effectively protecting the trailing edge from damage while matching the door's styling contours.
Implementation Method 1
Self-retention force is developed by elastic deformation of the original cross sectional shape of the door edge guard's metal
Data Source
AI summary
A door edge guard has a transverse cross section in which a corner edge of a laminated strip from which the door edge guard is formed applies retention force against an inside-facing surface of a door edge.