Vehicle Interior Panel Snap Joint Mechanism
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Solution Overview
Problem
Existing vehicle interior panel attachment methods often require separate clips or fasteners, which increase costs and manufacturing complexity, and may not provide a robust interlocking mechanism to prevent relative movement between panels.
Innovation Solution
A snap joint mechanism is formed by integrating protrusions and receptacles with bulges and grooves on the inner and outer pieces of the panel, allowing for a molded interlocking system that eliminates the need for additional fasteners and provides a robust attachment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If separate metal clips and fasteners are used to attach panel pieces, then the attachment strength is improved, but the device complexity and manufacturing cost increase
Solution Approach 1:
The patent integrates the fastening function directly into the panel pieces by molding protrusions and receptacles with interlocking features (bulges and grooves) as integral parts of the plastic panels themselves. This eliminates the need for separate metal clips and fasteners, combining the structural panel component and the attachment mechanism into a single integrated unit, thereby reducing device complexity while maintaining attachment strength
Solution Approach 2:
The panel pieces are designed with self-contained attachment features where the protrusion and receptacle form an interlocking snap joint without requiring external fasteners. The molded-in bulges and grooves create a self-sufficient attachment system that secures panels together through their own inherent structural features rather than relying on separate fastening components
2Reliability
If separate clips and fasteners are used for panel attachment, then the interlocking mechanism is improved, but the manufacturing cost and process complexity increase
Solution Approach 1:
The attachment features (protrusions, receptacles, bulges, and grooves) are molded as integral parts of the plastic panels in a single manufacturing process. This eliminates the need for separate manufacturing of clips and fasteners, reducing the total number of parts and assembly steps while ensuring a reliable interlocking mechanism through precise molded geometries that form strong snap joints
Solution Approach 2:
The patent utilizes the plastic material's ability to be molded into complex three-dimensional geometries with precise dimensional control. By changing the manufacturing approach from metal forming and assembly to plastic injection molding, the system achieves reliable interlocking through carefully controlled geometric parameters of the protrusions and receptacles, while significantly reducing manufacturing cost through single-process production
3Adaptability or versatility
If plastic-based clips and fasteners made from different materials are used, then the attachment functionality is achieved, but the material compatibility and manufacturing integration are worsened
Solution Approach 1:
The patent uses the same plastic material for both the panel pieces and the attachment features (protrusions and receptacles). This homogeneity of material eliminates compatibility issues between dissimilar materials, allows for integrated molding in a single manufacturing process, and ensures uniform thermal and mechanical properties throughout the entire panel assembly, thereby improving manufacturing integration while maintaining attachment functionality
Data Source
AI summary
A vehicle interior panel includes pieces held together by a snap joint formed when a protrusion of the outer piece is received by a receptacle of the inner piece. The receptacle is formed by a pair of walls extending from a back side of the inner piece, and the protrusion is received between the pair of walls. Oppositely facing bulges engage with oppositely facing grooves to form the joint. Sidewalls of the bulges also engage with angled sidewalls of the opposite piece to form a robust interlocking joint in which multiple pairs of opposing surfaces are engaged with each other to prevent relative movement of the inner and outer pieces in multiple directions. The features that form the snap joint can be molded as integral parts of the pieces being held together without the need for separate clips or fasteners.