Door Seal Spring-Loaded Drop Arm Mechanism
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Solution Overview
Problem
Existing automatic door seals rely on gravity to maintain contact with the threshold, which can be insufficient for effective sealing and may not function properly on uneven surfaces or in fire conditions.
Innovation Solution
A sealing assembly with a spring-loaded mechanism that imparts a continuous vertical force on the sealing member through a drop arm with flexible joints, using polypropylene and TPE materials, ensuring the seal remains firmly in place against the door threshold and can withstand fire by melting and fusing to maintain pressure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If gravity is used to maintain seal contact with threshold, then device complexity is reduced, but sealing reliability deteriorates on uneven surfaces
Solution Approach 1:
The patent applies a spring member that exerts an upward force counteracting gravity's downward pull on the sealing member. This counterweight mechanism ensures the seal maintains firm contact with the threshold even on uneven surfaces, resolving the contradiction by introducing a force that compensates for gravitational insufficiency without significantly increasing overall system complexity.
Solution Approach 2:
The drop arm with flexible joints creates a dynamic system that automatically adjusts the sealing member's position and pressure. As the door closes and the actuator moves, the flexible joints allow the arm to adapt to surface irregularities, maintaining reliable sealing contact dynamically rather than relying on static gravitational force.
2Reliability
If spring member is added to impart continuous vertical force, then sealing reliability is improved, but device complexity increases
Solution Approach 1:
The spring member is integrated with the existing drop arm mechanism, combining the spring's continuous force with the actuator's motion. This merging allows the spring to work in conjunction with the existing components rather than as a separate system, improving reliability while minimizing the increase in overall device complexity.
Solution Approach 2:
The spring member automatically maintains continuous vertical pressure on the sealing member without requiring external control or adjustment. Once installed, the spring self-regulates the force application, eliminating the need for additional control mechanisms and reducing the practical complexity increase despite adding a component.
3Adaptability or versatility
If flexible joints are used in drop arm, then adaptability to uneven surfaces is improved, but manufacturing precision requirements increase
Solution Approach 1:
The drop arm incorporates flexible joints made from elastomeric material that can bend and deform to accommodate surface irregularities. This flexibility allows the mechanism to adapt to uneven thresholds without requiring precision-machined adjustment features, as the material itself provides the adaptability through elastic deformation.
Solution Approach 2:
The drop arm is constructed as a composite structure combining rigid sections (for structural integrity) with flexible elastomeric joints (for adaptability). This composite design allows each section to perform its specific function optimally while being manufactured as an integrated unit, reducing the need for high-precision assembly of multiple separate components.
4Object-affected harmful factors
If TPE flexible section is selected to melt in fire, then fire resistance is improved, but material strength deteriorates at high temperature
Solution Approach 1:
The TPE material's tendency to melt at high temperatures is converted from a weakness into a safety feature. When exposed to fire, the TPE section melts and fuses, which actually locks the drop arm in its current position, preventing the seal from failing due to thermal expansion or structural degradation. The harmful melting behavior becomes beneficial by maintaining seal integrity through fusion.
Solution Approach 2:
The TPE material undergoes a phase transition from solid to molten state at elevated temperatures. This phase change allows the material to flow and fuse with adjacent surfaces, creating a permanent bond that maintains the sealing function even when the material loses its original mechanical strength. The phase transition effectively transforms the material's thermal response into a protective mechanism.
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 provides a reliable acoustic seal on both vertical and horizontal surfaces, maintains seal integrity on uneven floors, and offers fire-resistant properties by ensuring the seal remains in place and effective even in the presence of heat.
Implementation Method 1
a spring member (14) is provided which is connected to the sealing member at one part thereof and to a fixed connector block (54) within the channel at another part thereof in such a way as to pull/push the sealing member backwards into the channel when the actuator is deactivated
Implementation Method 2
The or each flexible TPE section may be selected so as to melt in the presence of heat associated with a fire so as to substantially fuse and fix the arm in its current state
Data Source
AI summary
A sealing assembly is disclosed fox a hinged door which is pivotable over a door threshold when closed. The sealing assembly comprises a plurality of elements located within a channel positionable adjacent an edge of the door. The elements comprise an actuator responsive to closing of the door, the actuator comprising at least one connector rod extending along the channel and being movable longitudinally within the channel in response to the door closing. The or each rod is connected to at least one pivotable arm comprising rigid sections divided by flexible joints, the other end of the arm being connected to a sealing member. The or each arm is flexible such that as the or each connector rod moves along the channel, part of the arm flexes vertically thereby imparting and maintaining vertical pressure on the sealing member during use.