Removable Barrier Insert for Threshold Sill Weather Sealing
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Solution Overview
Problem
Conventional threshold sills with weather seals are not aesthetically or functionally desirable for large exterior wall openings, and they fail to effectively control air, rain, wind, and sound infiltration, especially when accessible for handicapped individuals, as they do not meet ADA Standards for Accessible Design.
Innovation Solution
A threshold sill assembly with a removable barrier insert that is engaged with a cavity in the sill, providing a barrier to environmental conditions by acting as a dam to water, air, and sound intrusion, and can be configured to meet ADA requirements when the insert is not engaged, utilizing ramps and a wall gasket system for enhanced sealing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a removable barrier insert is engaged with the threshold sill, then water and air infiltration performance is improved, but device complexity increases
Solution Approach 1:
The threshold assembly is divided into modular components: a base threshold sill and a separate removable barrier insert. This segmentation allows the barrier function to be added or removed independently, improving weather performance when needed while maintaining simplicity during normal use. The barrier insert can be engaged with retention ribs or clips on the threshold sill, creating a multi-component system that addresses infiltration issues without permanently complicating the basic threshold structure.
Solution Approach 2:
The barrier insert is designed to be removable and reengagable, transforming a static threshold into a dynamic system that can adapt to different environmental conditions. Users can engage the barrier during rainy or windy periods to prevent infiltration, then remove it during clear weather to maintain aesthetic appearance and accessibility. This dynamic capability allows the system to optimize performance based on real-time needs without permanently increasing complexity.
2Reliability
If the removable barrier insert is engaged, then water performance is improved, but accessibility for handicapped individuals may be compromised
Solution Approach 1:
The removable barrier insert creates a dynamic threshold system that can switch between two states: engaged for water protection and disengaged for accessibility. When disengaged, the threshold maintains a low profile suitable for wheelchair access and meets ADA requirements. When engaged, the barrier extends vertically to prevent water infiltration. This dynamic transformation allows the same threshold to serve both accessibility and weather protection functions at different times.
Solution Approach 2:
By separating the water barrier function into a distinct removable component, the design allows the base threshold to remain simple and accessible, while the optional barrier provides protection when needed. The segmented design ensures that the essential accessibility function is never permanently compromised, as the barrier can be removed to restore full accessibility while maintaining water protection capability when required.
3Ease of operation
If conventional thresholds with weather seals are used, then accessibility is maintained, but aesthetic appearance and functional performance for large openings are degraded
Solution Approach 1:
The threshold system separates the aesthetic base threshold from the functional weather barrier. The base threshold maintains a clean, minimal profile suitable for large glass wall openings and preserves accessibility, while the removable barrier insert provides weather protection when needed. This segmentation eliminates the need for permanent bulky weather seals that would compromise aesthetics, allowing users to add protection only when environmentally necessary.
Solution Approach 2:
The weather barrier function is extracted from the permanent threshold structure and placed in a removable insert. This extraction allows the main threshold to maintain its aesthetic appeal with a simple, low-profile design suitable for modern glass wall installations. The barrier function is preserved in the removable component, which can be engaged only when weather protection is needed, rather than permanently altering the threshold's appearance with conventional weather seals.
Data Source
AI summary
A threshold sill seal assembly useful with glass wall systems is described. The assembly has a sill with a top surface. The threshold sill assembly includes a removable barrier insert that is removably engaged with a cavity provided in the top surface of the sill and has a portion substantially parallel to the movable glass wall that can act as a barrier to the intrusion of environmental conditions.