Guide Track Blind Structure for Wind-Resistant Screen Retention
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Solution Overview
Problem
Existing track guided blind systems face issues with screen flapping in windy conditions due to inadequate retention mechanisms, leading to potential damage and mechanical complexity, as previous solutions either allow flapping or compromise structural integrity and ease of operation.
Innovation Solution
A blind system featuring guide tracks with discrete parallel channel portions and a slit to securely guide the screen and bar, minimizing flapping and maintaining tension through adjustable slots and a single rigid longitudinal body, allowing for smooth extension and retraction while resisting separation and providing structural strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the slot is sufficiently large to receive the end of the draw bar, then the draw bar can be accommodated, but the screen can move within the slot and flap in windy conditions
Solution Approach 1:
The guide track is segmented into two distinct channel portions: a first channel portion that receives and secures the screen edge, and a second channel portion that receives the draw bar. This segmentation allows each channel to be optimized for its specific function, enabling the draw bar to be accommodated while the screen remains securely retained without flapping.
2Reliability
If the slot is sufficiently small so that the edges of the slot are close to the surface of the screen, then the screen is retained securely, but the end of the draw bar must be made very thin which is structurally weak
Solution Approach 1:
The guide track is divided into separate first and second channel portions, allowing the screen edge and draw bar to be received in different locations. This enables the first channel to have small edges for secure screen retention while the second channel can accommodate a thicker, stronger draw bar end.
3Reliability
If the screen is stretched to reduce flapping, then screen stability improves, but frictional resistance increases making extension and retraction harder
Solution Approach 1:
The guide track provides localized retention at the screen edges through the first channel portion, allowing the screen to be stable without requiring excessive overall tension. This localized support reduces frictional resistance during extension and retraction while maintaining screen stability when extended.
4Reliability
If the screen is stretched for extended periods, then screen stability is maintained initially, but the screen gradually loses elastic characteristics and becomes less effective
Solution Approach 1:
By securing the screen edges in the first channel portion rather than relying on overall tension, the screen experiences less continuous stretching. This reduces the gradual loss of elastic characteristics and maintains screen effectiveness over longer periods.
Data Source
AI summary
A blind system, including a screen with one end secured to a bar; and a guide track on opposite edges of said screen, each said guide track having a single rigid longitudinal body defining a guide channel with discrete parallel first and second channel portions; wherein, said screen has a edge portion extending through the second channel portion, a slit formed along said body, and into said first channel portion, for guiding the movement of said screen along said slit and for resisting separation of said edge portion from said first channel portion, and wherein said bar has an end portion adapted for movement only within said second channel portion for guiding said bar to move along said body.