Movable Door Leaf Sealing Strip Assembly with Cable Lifting Mechanism
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Solution Overview
Problem
Existing door sealing solutions, such as fixed door sills and movable sealing strips, often cause floor unevenness, damage, and fail to provide a barrier-free solution, as they protrude or require floor modifications, leading to gaps that trap impurities and allow water ingress.
Innovation Solution
A movable sealing strip assembly attached to a door leaf, featuring a bottom mechanism with a soft ribbon seal, guided vertically, and a cable-based lifting mechanism controlled by the door handle to lift the strip before opening, ensuring smooth door movement and adjustable height for uneven floors, with a pulley system and spring mechanism for arrest and release.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a fixed door sill is used to seal the space under the door, then sealing effectiveness is improved, but floor unevenness and protrusion occur
Solution Approach 1:
The door sill is transformed from a fixed structure to a movable one that can change its position between closed and open states. The movable door sill is guided by side walls to move vertically, being recessed into the floor when the door is open and protruding when the door is closed, thus maintaining both floor flatness and sealing effectiveness.
2Ease of operation
If a movable sealing strip is used to seal the space under the door, then barrier-free operation is improved, but floor damage occurs due to rubbing
Solution Approach 1:
The sealing strip is made movable vertically through a lifting mechanism connected to the door. When the door opens, the sealing strip is lifted off the floor to avoid rubbing and damage; when the door closes, it lowers to maintain sealing contact. This dynamic adjustment eliminates floor damage while preserving barrier-free operation.
Solution Approach 2:
The lifting mechanism raises the sealing strip in advance before the door leaf actually opens, preventing the sealing strip from rubbing against the floor during door movement. This preliminary lifting action occurs through the door's movement activating the lifting mechanism through a push bar and spring system.
3Ease of operation
If a movable door sill with height change mechanism is used, then floor flatness is improved, but floor modifications are required
Solution Approach 1:
The door sill system is divided into separate functional components: the movable door sill body, the lifting mechanism, the guiding side walls, and the sealing strip. This segmentation allows the mechanism to be pre-assembled and tested independently, then installed as a complete unit on the door itself without requiring complex floor modifications, as the mechanism moves with the door rather than being embedded in the floor.
4Ease of operation
If the sealing strip is lifted only after partial door opening, then door movement freedom is improved, but shear movement on floor occurs
Solution Approach 1:
The lifting mechanism is designed to raise the sealing strip in advance before the door leaf actually opens, preventing the sealing strip from rubbing against the floor during door movement. This preliminary lifting action occurs through the door's movement activating the lifting mechanism through a push bar and spring system.
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 effective barrier-free sealing, preventing floor damage, ensuring smooth door operation, and maintaining a flat floor surface by lifting the sealing strip before opening, allowing free movement and adjustable height, while ensuring the door can be arrested at any angle without additional devices.
Implementation Method 1
A mechanism disclosed herein comprises a vertically movable sealing strip of which movement is controllable by a push bar ending in a vertical edge of a door leaf by a door frame. When the door leaf is partially open, a gap between the door leaf and the door frame is created into which the push bar is shifted by a spring.
Implementation Method 2
featuring a bottom mechanism with a soft ribbon seal, guided vertically, and a cable-based lifting mechanism controlled by the door handle to lift the strip before opening
Data Source
Figure 1
Figure 2
Figure 3
AI summary
An assembly includes bottom mechanism (40) with a vertically movable sealing strip (41) for attaching to a door leaf (5). The assembly includes technical means for lifting up the sealing strip (41) from the lower position before opening of the door leaf (5). The assembly includes an upper mechanism (20) controllable by a door handle (2). The assembly includes a lifting element (1) linking the upper mechanism (20) and/or the door handle (2) with the bottom mechanism (40) for transfer of impulse from the door handle (2) to the sealing strip (41). The upper mechanism (20) comprises a pulley (21) being controllable by movement of the door handle (2). At least first cord (4) is arranged between the pulley (21) and the movable sealing strip (41) so it forms the lifting element (1). The assembly includes a technical means (3) for arresting of the movable sealing strip (41) in the upper position. The assembly may include a technical means for mechanical illustration of the door handle (2) position in the area between the latch tab (27) release position and the retention position of the technical means (3) for arresting of the movable sealing strip (41).