Door Drive Tension Spring Torque Curve Adjustment
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Solution Overview
Problem
Existing door and window drives require excessive force to initiate opening due to the design of curved slide rails, which increase overall depth and complicate the opening mechanism.
Innovation Solution
Incorporating a tension spring in the slide rail that supports the opening movement by adjusting its tension and position, providing a sharply falling torque curve from 4 to 80 degrees to ease the opening process, and then increasing torque to prevent damage beyond 80 degrees, with an optional stop to terminate spring support.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a curved guideway in the slide rail is used to improve the moment curve, then the moment curve is improved, but the overall depth of the slide rail increases and the force required to start opening the door increases
Solution Approach 1:
The patent extracts the function of improving the moment curve from the curved guideway and relocates it to a separate tension spring mechanism. The guideway becomes straight, eliminating the depth problem, while the tension spring independently provides the necessary moment support during door opening
Solution Approach 2:
The patent segments the moment curve improvement function from the guideway structure. The tension spring is introduced as a separate component that specifically addresses the moment curve issue without affecting the guideway geometry, allowing independent optimization of both components
2Force
If a tension spring is added to support the opening movement, then the initial force required to open the door is reduced, but the device complexity increases
Solution Approach 1:
The tension spring serves multiple functions: it supports the opening movement by providing counteracting force, shapes the moment curve, and works cooperatively with the compression spring in the actuator. This multi-functionality justifies the added component by delivering multiple benefits from a single element
Solution Approach 2:
The tension spring acts as an intermediary element between the operator and the door leaf during opening. It mediates the force transmission by providing progressive support, reducing the peak force requirement while maintaining control over the opening motion
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
Reduces the initial force required to open the door or window, facilitating easier operation while ensuring sufficient closing force and preventing damage by adjusting the torque curve and using a tension spring pack or elastic elements like rubber cords.
Implementation Method 1
a tension spring (6) arranged in the slide rail (3)... When opening the sash, the spring force acts on the slider until the spring is completely relaxed
Implementation Method 2
A piston which can be displaced against a spring and has teeth in which a pinion of an output shaft meshes... the energy stored by the compression of the compression spring is available again for closing the leaf
Data Source
Figure 1~2
Figure 3~4
Figure 5
AI summary
The drive (1) has an output shaft arranged in a drive housing (2). A sliding arm (5) is rotational fixedly connected with the output shaft. The arm is guided into a sliding rail (3) by a slider (4). A tension spring (6) is arranged in the sliding rail. The slider lies at an actuator (7) of the tension spring in a closed position of a wing (9) and tensions the tension spring. An end of the spring is received in a spring holder (8). The actuator comes into contact with a stop during opening the wing. The holder is displaceable and fixable in the sliding rail for adjusting spring tension.