Threshold Assembly Drainage Wall Design
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Solution Overview
Problem
Traditional threshold assemblies for entryway systems fail to effectively manage water infiltration between the door sweep and rail, leading to water accumulation and potential damage or slipping hazards within structures.
Innovation Solution
A threshold assembly design featuring a sill and rail with integrated drainage channels and passageways that direct water away from the interior of the structure, utilizing a drainage plane to facilitate fluid flow from the rail channel to the exterior, preventing water intrusion and ensuring positive drainage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a continuous, flat, horizontal engagement surface is used on the rail, then the door sweep can easily engage and seal, but water accumulates on the surface and flows into the interior
Solution Approach 1:
The rail engagement surface is segmented into multiple inclined planes or channels rather than a single flat surface. These segments create separate drainage pathways that guide water away from the interior while maintaining engagement functionality.
Solution Approach 2:
The design transitions from a two-dimensional flat surface to a three-dimensional profile with inclined planes and channels. This adds vertical and lateral dimensions to the surface geometry, enabling water to be directed along specific paths toward drainage openings.
2Ease of manufacture
If the rail has a flat engagement surface, then manufacturing is simple, but water drainage is ineffective
Solution Approach 1:
The rail is divided into functional segments including engagement surfaces, inclined planes, and drainage channels. This segmentation allows each component to be optimized for its specific function while remaining manufacturable using standard fabrication processes.
Solution Approach 2:
Different portions of the rail have different surface geometries tailored to their specific functions: flat surfaces for door sweep engagement, inclined planes for water redirection, and channel formations for drainage. This localized optimization maintains manufacturing simplicity while achieving reliable water protection.
3Ease of operation
If water is allowed to flow off the rail into the interior, then drainage is simple, but damage and slip hazards occur
Solution Approach 1:
The drainage function is extracted from the interior space and relocated to the exterior. Drainage openings are positioned in the rail to discharge water outside the structure, removing the harmful effect from the interior environment while maintaining simple gravitational drainage.
Solution Approach 2:
The inclined planes and drainage channels act as intermediary structures that intercept water on the engagement surface and redirect it toward exterior drainage openings. This intermediary system prevents direct water flow into the interior while maintaining the simplicity of passive drainage.
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
The solution effectively prevents water from entering the structure's interior, mitigating damage and slipping hazards while maintaining a water-tight seal, thus enhancing the functionality and safety of entryway systems.
Implementation Method 1
The rail channel, the channel passageway, the sill channel, and the drainage passageway at least partially define a drainage plane for permitting flow of the fluid from the rail channel to the exterior side of the sill
Data Source
AI summary
A threshold assembly is used with an entryway system disposed within an aperture of a structure. The threshold assembly includes a sill extending along an axis between exterior and interior sides. The sill at least partially defines a sill channel between the exterior and interior sides which is adapted for accepting a fluid. The threshold assembly includes a rail coupled to and disposed above the sill base. The rail has a drainage wall adjacent the exterior side and at least partially defining the sill channel. The rail at least partially defines a rail channel between the exterior and interior sides, and above the sill channel, which is adapted for accepting the fluid. The rail defines a channel passageway. The drainage wall defines a drainage passageway. The rail channel, the channel passageway, the sill channel, and the drainage passageway at least partially define a drainage plane.