Retractable Screen Tension Sections for Parallel Edge Movement
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Solution Overview
Problem
Existing retractable screen assemblies experience uneven extension and retraction of the screen material due to variability in zipper tape attachment, leading to uneven movement of the leading edge and potential wrinkling, especially when the zipper tape retainers are attached at slightly different angles or have differences in straightness across the length of the screen material.
Innovation Solution
Incorporating tension sections on the core with an effective diameter greater than the core diameter outside the tension section, ensuring the screen material is in tension along a zone aligned with but spaced apart from the edges, allowing for consistent unwinding and winding forces to be applied uniformly across the screen material.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If zipper tape retainers are used for edge retention, then the screen material can be rolled onto the core, but the variability in attachment process causes uneven diameters and non-parallel extension/retraction
Solution Approach 1:
A tensioning member is introduced as an intermediary component between the screen material and the core. This tensioning member spans across the screen material and applies uniform tension forces, mediating the connection between the variable zipper tape attachment and the core winding process, thereby compensating for alignment variations and ensuring parallel extension and retraction.
Solution Approach 2:
The tensioning member changes the mechanical parameters of the screen material by applying controlled tension forces. This parameter change (from variable attachment points to uniform tension distribution) ensures that the screen material winds and unwinds evenly on the core, maintaining parallel movement of the leading edge regardless of zipper tape attachment variations.
2Manufacturing precision
If tension sections with greater effective diameter are added to the core, then uniform tension and parallel movement are achieved, but the device complexity increases
Solution Approach 1:
The core is segmented into different functional zones: a first portion with a first diameter for general winding, and a second portion (tension section) with a second, greater diameter for applying uniform tension. This segmentation allows each portion to perform its specific function while maintaining overall system simplicity.
Solution Approach 2:
The core structure is modified locally by adding a tension section with greater diameter only in the specific region where tension application is needed, rather than increasing the diameter of the entire core. This localized modification achieves the required tension uniformity while minimizing additional complexity and material usage.
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
This design ensures even and parallel movement of the leading edge, reduces wrinkling, and improves the extension and retraction process, while also allowing for adjustments in performance parameters such as diameter and placement of tension sections to optimize speed and reduce friction.
Implementation Method 1
the screen material is in tension along a tension zone aligned with the tension section along the length of the screen material
Implementation Method 2
A torsion spring is installed in the central core with, for example, one end fixed to the inside diameter of the core and the other end fixed to a stationary bracket to provide for manual extension and automatic retraction of the screen material
Data Source
AI summary
Retractable screen assemblies having cores with tension sections and methods are described herein. The retractable screen assemblies include features configured to promote parallel (or nearly parallel) extension and retraction in a retractable screen assembly in which the edges of the screen material are retained during extension and retraction.