Automatic Door Bottom Seal With Pivotable Arm Mechanism
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Solution Overview
Problem
Existing automatic door bottom drop-down seals lack a mechanism to maintain continuous downward pressure on the seal, leading to inefficiencies in sealing against the floor, particularly on uneven surfaces, and fail to provide adequate acoustic sealing.
Innovation Solution
A drop-down seal mechanism featuring a pivotable arm connected to a slide block within a channel, which imparts and maintains downward pressure on the sealing member as the door closes, using a combination of sliding blocks, C-shaped brackets, and coiled springs to ensure the seal remains firmly pressed against the floor.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If flat leaf springs are used to lower the H-shaped housing, then the seal can be positioned against the floor, but the housing has little resistance to upward pressure and cannot maintain continuous downward pressure on the seal
Solution Approach 1:
The patent employs a dynamic linkage mechanism consisting of a pivotable arm connected to a slide block within a channel. As the door closes, the slide block moves along the channel, causing the pivotable arm to rotate and continuously apply downward force on the seal. This dynamic system ensures the seal maintains pressure against the floor throughout the closing operation, resolving the contradiction between initial positioning and sustained pressure.
Solution Approach 2:
The patent utilizes a C-shaped channel with a curved profile that guides the slide block during door closure. The curved geometry of the channel transforms the linear motion of the door into rotational motion of the pivotable arm, enabling continuous downward pressure application. This curved path design ensures smooth, continuous force application rather than intermittent contact, improving sealing reliability.
2Reliability
If the H-shaped housing drops down to rest against the floor, then a draft barrier is formed, but gaps form on uneven floors and acoustic sealing is inadequate
Solution Approach 1:
The patent changes the pressure parameter applied to the seal by introducing a mechanism that actively maintains downward force. The pivotable arm system varies the magnitude of downward pressure during door closure, ensuring the seal is pressed firmly against the floor surface. This parameter change from passive contact to active pressure application improves both draft blocking and acoustic sealing by ensuring consistent seal engagement.
3Force
If a handle is used to hold the seal housing down, then downward pressure can be maintained, but the operation becomes cumbersome and requires user intervention at the bottom of the door
Solution Approach 1:
The patent implements a self-service mechanism where the door's own closing motion powers the seal application. The slide block, driven automatically by door closure, moves along the C-shaped channel and rotates the pivotable arm, which then applies downward pressure on the seal autonomously. This eliminates the need for manual handle operation, as the system uses the door's kinetic energy to perform the sealing action automatically.
Solution Approach 2:
The patent replaces the manual mechanical handle system with an automated mechanical linkage system. Instead of requiring direct user manipulation of a handle at the bottom of the door, the design substitutes a remote-actuated linkage mechanism where the user simply closes the door, and the integrated slide block and pivotable arm system automatically performs the seal application function.
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 mechanism ensures a consistent and enhanced sealing performance, including improved acoustic sealing and self-leveling capability on uneven surfaces, maintaining pressure until the door is opened, thereby enhancing energy conservation and dust protection.
Implementation Method 1
the arm being pivotable as the block slides along the channel to a position whereby the arm extends downwardly between the block and the sealing member thereby to impart and maintain downward pressure on the sealing member during use
Implementation Method 2
using a combination of sliding blocks, C-shaped brackets, and coiled springs to ensure the seal remains firmly pressed against the floor
Data Source
Figure 1
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Figure 5~6
AI summary
An automatic door bottom drop down seal having an actuator (28) responsive to closing of a door for moving a sealing member vertically downwards into a sealing position relative to the door threshold when the door is closed. The actuator includes an arm (34) connected to a block (26) slidable within a channel (24) of the seal housing. The arm (34) is pivotally connected to the slide block (26) so to pivot downwardly to impart downward pressure on the sealing member (40).