Vehicle Shading Device Guide Slot Design
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Solution Overview
Problem
Existing shading devices for vehicle side windows often leave viewing gaps between the guide rails and the flexible fabric due to non-parallel alignment, and fail to securely maintain the fabric in place, especially when the window is open and subjected to drafts.
Innovation Solution
The solution involves a panel profile with a funnel-shaped guide slot that accommodates the fabric's side edge, ensuring it remains within the guide slot, and includes a guide band and clamping means to secure the fabric, with elastic tensioning to maintain the fabric's position and prevent protrusion from the guide rails.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the guide rails are not parallel to accommodate curved window shapes, then the shading device can fit vehicle-specific window contours, but viewing gaps appear between the guide rails and fabric side edges
Solution Approach 1:
The panel profile is designed with a guide slot that has different width characteristics at different locations: wider at the insertion end to facilitate entry of the fabric side edge, and narrower at the retention end to securely hold the fabric and eliminate viewing gaps. This local variation in geometry resolves the contradiction between accommodating curved paths and maintaining reliable fabric retention without viewing gaps.
2Reliability
If the guide slot width is large enough to accommodate non-parallel guide rail alignment, then the fabric can be inserted and retained reliably, but the fabric side edge may protrude from the guide rails
Solution Approach 1:
The guide slot is segmented into functional zones: an insertion zone with wider width to accommodate fabric entry, a transition zone that gradually narrows, and a retention zone with narrower width that prevents fabric protrusion. This segmentation allows the single guide slot structure to simultaneously achieve reliable retention and proper fabric alignment throughout its length.
3Shape
If the guide slot is narrow to prevent fabric protrusion, then fabric alignment is maintained, but the fabric cannot be reliably inserted and retained when guide rails are non-parallel
Solution Approach 1:
The guide slot is designed with preliminary widening at the insertion end, creating an insertion aid that facilitates fabric entry before the fabric reaches the narrower retention portion. This preliminary geometric modification ensures reliable insertion and retention while maintaining proper alignment throughout the fabric's path through the non-parallel guide rails.
Data Source
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AI summary
The invention relates to a protective device for a vehicle interior, comprising a flexible sheet material, which is movably supported between a compactly stored idle position and at least one stretched-out functional position, and lateral guide rails, which in the vehicle-mounted operating position extend non-parallel to each other and in which a pull-out profiled element of the sheet material is guided, wherein each guide rail comprises a trim profiled element for covering a side edge of the stretched-out sheet material, is known. According to the invention, the trim profiled element forms a longitudinally extended guide slit for the side edge of the sheet material, the width of which is selected in such a way that the side edge extends into the guide slit over the entire length of the side edge in the stretched-out functional position of the sheet material. The invention further relates to use in passenger cars.