Sealing Device with Movable Strip for Door and Window
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Solution Overview
Problem
Existing sealing devices for doors and windows often suffer from premature contact of the sealing strip with the ground during closure, leading to friction and air pressure issues, and the movement-damping elements used to mitigate these problems are unreliable and costly, with reduced effectiveness over time.
Innovation Solution
A sealing device with a two-part trigger mechanism, where the outer release part is directly driven by the closing movement of the door or window, and the inner release part is locked until the outer part moves a non-zero minimum distance, using an adjustable spring to drive the sealing strip into position, allowing for independent adjustment of the sealing strip's path and triggering point.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the sealing strip is lowered during the closing movement of the sash to seal the gap, then the sealing function is improved, but the sealing strip rubs against the ground during the last part of the closing movement and the first part of the opening movement, increasing friction and making the door difficult to close
Solution Approach 1:
The trigger mechanism is segmented into an outer trigger part and an inner trigger part that operate at different stages of the sash closing movement. The outer trigger part is activated first by the closing movement, which tensions the spring, while the inner trigger part remains blocked until the sash is fully closed, then releases to lower the sealing strip. This segmentation allows the sealing action to be separated from the closing movement, eliminating friction during the closing process.
Solution Approach 2:
The spring is pre-tensioned by the outer trigger part during the closing movement before the sealing strip is actually lowered. This preliminary action stores energy that is then released to quickly lower the sealing strip only when the sash is fully closed, ensuring the seal is in place before any rubbing can occur during opening.
2Object-affected harmful factors
If a movement-damping element is used to delay the downward movement of the sealing strip, then the rubbing during closing is reduced, but the damping properties become unreliable over time and thousands of movement cycles
Solution Approach 1:
The unreliable movement-damping element is replaced with a purely mechanical trigger mechanism consisting of the outer and inner trigger parts connected by a spring. This mechanical system provides deterministic, repeatable operation based on the sash closing position without relying on damping properties that degrade over time. The spring-tensioning mechanism ensures consistent timing of the sealing strip deployment across thousands of cycles.
3Reliability
If the sealing strip is lowered earlier to improve sealing, then the sealing function is enhanced, but the door becomes difficult to close due to air pressure difference between the two sides of the sash
Solution Approach 1:
The trigger mechanism is designed so that the inner trigger part, which actually lowers the sealing strip, remains blocked during the entire closing movement until the sash is fully closed. This ensures the sealing action occurs only after the air pressure equalization is complete, eliminating air pressure resistance while maintaining effective sealing.
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
This design ensures the sealing strip only contacts the ground when the door is fully closed, reducing friction and air pressure issues, and maintains reliable performance over time by avoiding the limitations of movement-damping elements.
Implementation Method 1
An elastic spring is tensioned between the inner and outer triggering part, the prestressing of which can be increased in that the outer triggering part is displaced relative to the wing by the closing movement of the wing, and the inner triggering part is fixed by the lock against movement on the wing
Data Source
Figure 1
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AI summary
The invention relates to a sealing device (3) for the edge area of a movable sash (1, 22, 54) of a door or window, with a sealing strip (4, 67) movable relative to the sash (1, 22, 54) whose movement can be driven by an inner release part (9, 21, 36, 40, 62), which in turn can be driven by an outer release part (8, 20, 39, 60) which is coupled to it via an elastic spring (10, 24, 41, 61). The inner release element (9, 21, 36, 40, 62) can be blocked against movement relative to the sash (1, 22, 54) by a locking mechanism (11, 25, 35, 38), the lock being released by moving a locking release element (16, 33, 50, 66) into a switching position. The movements of the outer release element (8, 20, 39, 60) and the locking release element (16, 33, 50, 66) are driven by the closing movement of the sash (1, 22, 54).The extent to which the outer release part (8, 20, 39, 60) moves and the position of the wing (1, 22, 54) at which the locking release part (16, 33, 50, 66) reaches the switching position can be set independently of each other.