Floating Sash Fenestration Seal Dynamics
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Solution Overview
Problem
Fenestration assemblies with movable sashes face challenges in easing sliding movement while maintaining sealing efficiency, as the continuous compression of weather stripping generates significant friction, requiring substantial force to initiate movement and accelerating wear.
Innovation Solution
The introduction of floating sashes with seals that transition between compressed and relaxed configurations, allowing for easier movement by relaxing compression when opening or closing, and enhancing insulation by compressing the seal when secured.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If weather stripping is continuously compressed between sash perimeter and fenestration frame to ensure sealing, then sealing effectiveness is improved, but friction force increases making sash movement difficult
Solution Approach 1:
The weather stripping is designed to dynamically change its compression state based on sash position. During movement, the seal transitions to a relaxed state with reduced compression, lowering friction. When the sash reaches its target position, the seal transitions to a compressed state to ensure sealing effectiveness. This dynamic adaptation resolves the contradiction between ease of movement and sealing reliability.
2Reliability
If weather stripping is continuously compressed to maintain sealing, then insulation performance is improved, but wear of the weather stripping accelerates
Solution Approach 1:
The weather stripping experiences periodic compression and relaxation cycles corresponding to sash movement. During movement phases, the seal is relaxed reducing wear. During stationary closed phases, the seal is compressed to maintain insulation performance. This periodic action pattern allows the weather stripping to maintain high insulation effectiveness while significantly reducing cumulative wear and extending service life.
3Ease of operation
If significant force is applied to initiate sash movement to overcome friction, then sash can be moved, but slamming and crashing occurs
Solution Approach 1:
The system applies preliminary anti-action by pre-relaxing the weather stripping compression before sash movement is initiated. This reduces the static friction force that must be overcome, allowing gentle initiation of movement without requiring significant force. By reducing the initial force requirement, the harmful slamming and crashing effects are prevented before they can occur.
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 solution reduces the force required to move sashes, decreases wear on the seals, and maintains effective sealing and insulation properties by dynamically managing the seal's compression state.
Implementation Method 1
floating seals that transition between compressed and relaxed configurations
Implementation Method 2
The compression of the weather stripping generates friction between the sashes and the fenestration frame that resists sash movement
Data Source
AI summary
A fenestration assembly includes a fenestration frame and at least one floating sash movably coupled within the fenestration frame. The at least one floating sash is configured to move between open and closed positions within the fenestration frame. The floating sash includes a sash perimeter extending around the floating sash and a sash face. A floating seal is coupled along the sash face. The floating seal includes compressed and relaxed configurations. In the relaxed configuration the floating seal is relaxed and the floating sash is movable between the open and closed positions. In the compressed configuration the floating seal is compressed relative to the relaxed floating seal in the relaxed configuration.