Retractable Screen System Hook Engagement Mechanism
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Solution Overview
Problem
Fenestration assemblies with movable glass panels and fixed screens face challenges in maintaining unobstructed views, as screens accumulate detritus and obscure vision when exposed to elements, and existing hidden screen assemblies are difficult to implement in windows not designed for them.
Innovation Solution
A retractable screen system that includes a catch assembly, edge rails, and a screen assembly with a roller housing, where the screen material is wound around a roller assembly and unwinds as the sash moves, using a hook element to engage and disengage with a catch element, and a lever system to control the engagement, allowing the screen to move up and down with the sash without projecting beyond the frame.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a fixed screen is installed in the fenestration assembly, then insects and pests are kept out, but the view through the glass panel is obscured and detritus accumulates on the screen
Solution Approach 1:
The screen is transformed from a fixed structure to a dynamic, movable one that can be retracted into the sash when not in use and deployed when needed for pest protection, eliminating continuous view obstruction while maintaining protective function
Solution Approach 2:
The screen assembly is nested within the sash structure, with the screen material wound around a roller assembly that is hidden within the sash profile, allowing the screen to be stored compactly when not needed
2Object-affected harmful factors
If a hidden screen assembly is implemented in a window not designed for it, then the screen can be concealed, but the implementation becomes challenging and complex
Solution Approach 1:
The fenestration assembly is designed to accommodate multiple functions: the sash structure serves both as the moving window component and as the housing for the hidden screen assembly, eliminating the need for separate structural modifications
Solution Approach 2:
The screen assembly is merged with the sash structure, sharing common components such as the rail slots and coupling mechanisms, thereby simplifying implementation while achieving the hidden screen effect
3Ease of operation
If the screen is continuously exposed to the elements, then it remains accessible for use, but airborne detritus accumulates on the screen over time
Solution Approach 1:
The screen transitions from a static exposed position to a dynamic system that can be retracted into protection within the sash when not in use, reducing exposure to elements and detritus accumulation while maintaining accessibility when needed
Data Source
AI summary
A retractable screen system for a fenestration assembly includes a catch assembly, a pair of edge rails, and a screen assembly. The catch assembly is configured to couple to an outer surface of a sash. The catch assembly includes a catch element. The screen assembly includes a roller housing, a roller assembly, a control bar, and screen material. The roller housing is configured to couple to an outer surface of the frame. The control bar includes a hook element extending along at least a portion of the control bar. The hook element is configured to selectively engage the catch element. The roller assembly is configured to apply tension to the screen material to permit the screen material to unwind from the roller assembly under a tension applied by moving the catch assembly away from the roller assembly when the hook element engages the catch element.