Clipless Roof Ditch Molding With Integral Metal Clips
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Solution Overview
Problem
Existing roof ditch molding for vehicles faces issues with precise alignment during assembly due to mismatched spacing of plastic and metal fasteners, leading to increased costs and assembly complexity, and suffers from durability and aesthetic problems over time due to plastic degradation.
Innovation Solution
A clipless roof ditch molding design featuring an elongate metal substrate with a polymeric coating and flexible seal lips, where the metal substrate's edge regions are spaced for resilient snapping receipt of fasteners, eliminating the need for supplemental fastening features and enhancing durability and aesthetics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If plastic fastener clips and separate metal clips are used to fix roof ditch molding, then the molding can be secured within the roof ditch, but precise alignment and matching spacing of fasteners is required, increasing assembly complexity and cost
Solution Approach 1:
The patent combines the roof ditch molding with integral metal clips formed as part of the extruded metal substrate structure. The metal clips are directly formed on the molding body, eliminating the need for separate metal clips and plastic fastener clips, thereby reducing assembly complexity while maintaining secure attachment.
Solution Approach 2:
The metal substrate serves multiple functions: it provides the structural molding body, forms the integral metal clips for attachment, and creates the receptacles for receiving fasteners. This multi-functionality eliminates the need for separate components and simplifies the overall assembly.
2Reliability
If metal clips are fixed within molded plastic receptacles, then the molding can be attached to fasteners, but additional component inventory and assembly steps are required, increasing cost
Solution Approach 1:
The metal clips and receptacles are formed as integral parts of the extruded metal substrate in a single manufacturing process. This eliminates the need for separate component inventory and multiple assembly steps, reducing manufacturing cost while maintaining attachment capability.
Solution Approach 2:
The metal substrate is extruded with segmented features including the molding body, metal clips, and receptacles formed as distinct but integrated elements, allowing for efficient single-step manufacturing while maintaining functional separation.
3Ease of manufacture
If roof ditch molding is molded entirely from plastic, then manufacturing is simple, but strength, durability and appearance deteriorate over time due to outgassing, hardening and embrittlement
Solution Approach 1:
The patent uses an extruded metal substrate (aluminum or aluminum alloy) that provides superior strength, durability and resistance to environmental degradation. The metal material eliminates the outgassing, hardening and embrittlement problems associated with plastic while maintaining ease of manufacture through extrusion processes.
Solution Approach 2:
The invention changes the material parameter from plastic to metal, fundamentally altering the physical and chemical properties to achieve improved durability, strength and appearance retention over time, while the extrusion process maintains manufacturing simplicity.
4Shape
If plastic roof ditch molding is used, then initial appearance is good, but over time the plastic hardens and becomes embrittled, leading to cracking, chipping and discoloration
Solution Approach 1:
The extruded metal substrate provides inherent resistance to cracking, chipping and discoloration that occurs in plastic over time. The metal material maintains its structural integrity and appearance throughout the service life, eliminating the degradation issues associated with plastic aging.
Solution Approach 2:
Changing the material from plastic to metal fundamentally improves the duration of service life by eliminating the chemical degradation mechanisms (outgassing, oxidation, embrittlement) that affect plastic, while maintaining excellent appearance properties.
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
Simplifies assembly by eliminating the need for additional fasteners, reduces manufacturing and assembly costs, and improves durability and appearance by using a metal substrate with a polymeric coating and flexible seal lips, preventing leaks and maintaining aesthetics over time.
Implementation Method 1
the opposite edge regions are spaced from one another for resilient snapping receipt of a plurality of fasteners therein
Implementation Method 2
a polymeric material can be bonded to the outer surface of the metal substrate
Data Source
AI summary
A roof ditch molding, roof ditch molding assembly, method of constructing a roof ditch molding, and method of assembling a roof ditch molding into a roof ditch of a vehicle are provided. The roof ditch molding includes an elongate metal substrate having an outer surface and an inner surface with opposite edge regions extending along a direction of a longitudinal axis between opposite ends. The inner surface faces and delimits an elongate channel extending between the opposite ends. The opposite edge regions are spaced from one another for snapping receipt of a plurality of fasteners therebetween, thereby eliminating the need for supplemental fastening features to fixedly secure the roof ditch molding within the roof ditch.