Threshold Assembly Self-Adjusting Rail Seal
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional threshold assemblies for entryway systems fail to effectively prevent water and debris infiltration between the sill and rail, regardless of the door's open or closed position, due to inadequate self-adjustment mechanisms.
Innovation Solution
A threshold assembly featuring a rail with retaining arms and a biasing member that adjusts between initial and second positions, creating a retention pocket to securely retain the biasing member and prevent infiltration, with the biasing member compressing to enhance sealing when the door is closed and expanding to allow self-adjustment when the door is open.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the rail is biased toward the door panel to create a self-adjusting seal, then the sealing capability is improved, but water and debris can still infiltrate between the sill and the rail when the door is open or closed
Solution Approach 1:
The sealing system is divided into multiple independent sealing elements: a first seal between the rail and door panel, and a second seal between the sill and rail. This segmentation allows each seal to address specific infiltration paths independently, preventing water and debris from bypassing the primary seal through gaps between sill and rail.
Solution Approach 2:
A biasing member is introduced as an intermediary element between the sill and rail, applying continuous biasing force to maintain the second seal. This intermediary mechanism ensures the rail remains properly positioned and sealed against the sill throughout the door's movement, preventing infiltration without requiring manual adjustment.
2Reliability
If the door panel and rail are set to a predetermined height to create a proper seal, then the sealing is achieved, but the assembly lacks adaptability to variations in door panel positioning
Solution Approach 1:
The system transitions from a static predetermined height setting to a dynamic self-adjusting mechanism. The rail can move vertically between an initial position (when door is open) and a second position (when door is closed), automatically adapting to different door panel positions through the biasing member's continuous force.
Solution Approach 2:
The threshold assembly performs self-adjustment without external intervention. The biasing member continuously pushes the rail to maintain optimal sealing position, allowing the system to automatically compensate for variations in door panel positioning, installation tolerances, and wear over time.
3Adaptability or versatility
If the rail is allowed to move freely to self-adjust, then adaptability is improved, but the sealing consistency and control are reduced
Solution Approach 1:
The biasing member is pre-installed and configured to apply continuous biasing force to the rail before the door is closed. This preliminary action ensures the rail is already positioned optimally for sealing when the door closes, preventing inconsistent sealing due to lack of pre-positioning or excessive movement.
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 seals against water and debris infiltration between the sill and rail in both open and closed door positions, optimizing the self-adjustment feature to maintain a watertight seal and prevent backflow.
Implementation Method 1
a biasing member disposed between the upper sill surface and the lower rail surface. The biasing member comprises a first portion disposed within the retention pocket, and a second portion disposed between the first portion of the biasing member and the upper sill surface
Implementation Method 2
The first retaining arm extends from the lower rail surface toward the upper sill surface to a distal retention end of the first retaining arm. The second retaining arm extends from the lower rail surface toward the upper sill surface to a distal retention end of the second retaining arm. The first and second distal retention ends define a retaining width (W1) therebetween. The first retaining arm, the lower rail surface, and the second retaining arm collectively define a retention pocket.
Data Source
AI summary
A threshold assembly for an entryway system includes a sill presenting an upper sill surface, and a rail coupled to and disposed above the upper sill surface. The rail is movable between an initial and second position. The rail presents a lower rail surface facing the upper sill surface and has first and second retaining arms extending from the lower rail surface toward the upper sill surface to a distal retention end of the first and second retaining arms. The distal retention ends define a retaining width (W1) therebetween. The first retaining arm, the lower rail surface, and the second retaining arm collectively define a retention pocket. The threshold assembly includes a biasing member comprising a first portion disposed in the retention pocket. The retention pocket has a width (W2) greater than the retaining width (W1) for retaining the first portion of the biasing member within the retention pocket.