Drop-down Seal Longitudinal Adjustment Mechanism
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Solution Overview
Problem
Existing automatically mechanically lowerable sealing devices for doors face challenges when shortened, as they either scratch the door frame or fail to seal the gap effectively due to loss of optimal adaptation, leading to suboptimal sealing performance.
Innovation Solution
A sealing device with a housing rail, sealing strip, and lowering mechanism that allows the sealing strip to be moved manually in the longitudinal direction, enabling it to be shortened while maintaining optimal sealing properties by adjusting its position relative to the housing rail, thus preventing protrusion and ensuring effective sealing without scratching the door frame.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the sealing device is shortened to adapt to the door mass, then the adaptation to door mass is improved, but the optimal sealing adaptation is lost causing the sealing profile to not rest on the door frame
Solution Approach 1:
The sealing strip is made movable relative to the housing rail through a fastening module with displacement openings and pins, allowing dynamic repositioning in the longitudinal direction. This enables the sealing strip to maintain optimal sealing contact with the door frame even after the device is shortened, resolving the contradiction between adaptability to door mass and sealing effectiveness.
2Adaptability or versatility
If the sealing device is shortened, then the adaptation to door mass is improved, but the sealing strip protrudes and scratches the door frame
Solution Approach 1:
The movable sealing strip can be repositioned along the longitudinal direction using the fastening module with displacement openings. After shortening, the sealing strip is moved backward to prevent protrusion and scratching of the door frame, while maintaining proper sealing contact.
Solution Approach 2:
The position parameter of the sealing strip is changed by moving it along the longitudinal direction relative to the housing rail. This parameter adjustment allows the sealing strip to maintain optimal positioning after the device is shortened, preventing both protrusion and loss of sealing contact.
3Ease of operation
If the sealing strip is moved in the longitudinal direction when lowering, then the sealing mechanism functions properly, but the support rail rubs against the door frame and scratches it
Solution Approach 1:
The sealing strip is repositioned in advance along the longitudinal direction before the lowering operation. By moving the sealing strip backward using the fastening module, the support rail is positioned to avoid rubbing against the door frame during the lowering process, preventing scratching while maintaining proper 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 solution allows for optimal sealing performance even after shortening, preventing the sealing strip from protruding and scratching the door frame, while maintaining the same sealing effectiveness as an unshortened seal, ensuring effective sealing of the gap between the door and floor.
Implementation Method 1
The lowering mechanism further comprises at least two leaf springs, each of which is firmly connected to the slide at a first end and is pivotally attached to the housing rail at a second end
Implementation Method 2
the elastomeric sealing profile does not bulge too much in the vertical door gap
Data Source
Figure 1a~1d
Figure 2a~2b
Figure 3a~3d
AI summary
A sealing device for a door has a housing rail (1), a sealing strip, which is held in the housing rail (1), with a carrier rail (2) and with a sealing profile (3), and a drop-down mechanism (4, 6, 60) for raising and lowering the sealing strip (2, 3). The drop-down mechanism (4, 6, 60) is fastened to the housing rail (1) in a first fastening point (7) and to the carrier rail (2) in a second fastening point (8). The second fastening point (8) allows a displacement of the sealing strip in the longitudinal direction (L) of the sealing device and relative to the housing rail (1). This allows simple adaptation to door situations in situ, with it being possible in particular for the drop-down seal to be shortened to a desired length without the carrier rail then protruding too far.