Plastic Window Assembly with Snap-Fit Flange
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Solution Overview
Problem
Automotive glass windows are heavy and complex, contributing to increased fuel consumption and safety concerns due to their weight and propensity to shatter, which complicates assembly and emergency escape routes.
Innovation Solution
A plastic window assembly for motor vehicles featuring a polycarbonate panel with a snap-fit window flange that engages a corresponding feature on the window frame, reducing weight and complexity while providing a secure and easy installation method without adhesives or primers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If glass windows are used in automobiles, then visibility and durability are improved, but vehicle weight increases and fuel consumption increases
Solution Approach 1:
The patent changes the material parameter from glass to plastic (specifically polycarbonate or other automotive-grade plastics), maintaining optical properties and durability while significantly reducing weight. The plastic window panel provides comparable visibility and strength to glass but weighs substantially less, directly addressing the weight-consumption tradeoff.
2Illumination intensity
If glass windows are used in automobiles, then visibility is improved, but vehicle weight increases and center of gravity rises
Solution Approach 1:
The patent substitutes glass with plastic material that maintains optical transparency and visibility properties while reducing density and weight. The plastic window panel achieves comparable light transmission and clarity to glass but with significantly lower mass, improving vehicle weight distribution and fuel efficiency.
3Reliability
If glass windows are used in automobiles, then durability is improved, but assembly complexity increases due to primer and bonding materials
Solution Approach 1:
The patent extracts and eliminates the complex bonding system (primers, adhesives, and bonding materials) required for glass windows by designing a plastic window with an integrated flange that mechanically attaches to the door frame. This self-contained attachment feature removes the need for separate bonding materials and simplifies the assembly process while maintaining durability.
Solution Approach 2:
The patent merges the window panel and attachment flange into a single integrated plastic component. The flange is molded as part of the window panel itself, combining the sealing, structural, and attachment functions into one piece, thereby eliminating the need for separate bonding materials and reducing assembly complexity.
4Reliability
If glass windows are used in automobiles, then safety is compromised due to shattering risk, but emergency escape routes require deliberate shattering
Solution Approach 1:
The patent converts the harmful shattering property of glass into a beneficial feature by using plastic that deliberately breaks or deforms in a controlled manner during impact. The plastic window absorbs impact energy through deformation rather than shattering into dangerous fragments, yet can still be broken open in emergencies to provide escape routes, turning the potential harm into a safety advantage.
Data Source
AI summary
A plastic window for use in a motor vehicle includes a plastic panel having portions defining an edge about a perimeter of the panel and a window flange integral to the plastic panel. The window flange is positioned adjacent to the edge and extends at least partially them along. The window flange includes an engagement feature configured to engage a corresponding engagement feature of a window frame. A window assembly Includes the plastic window and a window frame configured to be attached to a motor vehicle. The window frame has portions forming the corresponding engagement feature which receive the engagement feature of the window flange to secure the plastic window to the window frame. A method of installing a window on a motor vehicle is also disclosed.