Window Sash Load Transfer via Helical Gear Mechanism
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Solution Overview
Problem
Existing load transfer devices for heavy sashes cause a reduction in distance between frame and sash when opened, leading to sash lowering and increased effort required for closing, due to the design of pivot bearings and inclined load transfer elements.
Innovation Solution
A load transfer device with a rotary connection section featuring a sleeve with an internal thread and a pin with an external thread, forming a helical gear, allowing the distance between the load-bearing part and the coupling part to change with the angle of rotation, maintaining a constant vertical distance and compensating for inclined positions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If a rod-shaped load transfer element is used that remains vertical when the sash is closed, then vertical weight forces can be absorbed effectively, but the sash lowers relative to the frame when opened by rotation
Solution Approach 1:
The load transfer element is designed to change its orientation dynamically. When the sash is closed, the element is vertical to absorb weight forces. When the sash opens, the element can tilt or rotate, allowing the distance between fitting elements to decrease without causing sash lowering. This dynamic adaptation resolves the contradiction between maintaining vertical force absorption and preventing sash position change during operation.
Solution Approach 2:
The invention changes the parameter of the load transfer element's orientation angle. By allowing the element to transition from a vertical position (0° tilt) when closed to an inclined position when opened, the system maintains effective load transfer while accommodating the rotational movement of the sash without causing harmful position changes.
2Force
If the load transfer element is positioned vertically when the sash is closed, then load transfer is effective, but increased muscle strength is required to close the sash by rotation
Solution Approach 1:
The load transfer element dynamically adjusts its position during sash operation. During closing, as the sash approaches the closed position, the element transitions to a vertical orientation that provides effective load transfer. The system is designed so that the mechanical advantage is optimized at different positions, reducing the effort required for closing while maintaining load transfer effectiveness.
Solution Approach 2:
The load transfer element is pre-positioned or pre-loaded in such a way that it begins to engage and provide mechanical assistance before the sash is fully closed. This preliminary action reduces the muscle strength required by the user during the closing motion, while still achieving effective load transfer at the closed position.
3Ease of operation
If pivot bearings are designed to allow sash lowering during opening, then the load transfer can function, but the device complexity increases
Solution Approach 1:
The invention extracts the load transfer function from the pivot bearing system. Instead of designing complex pivot bearings that accommodate sash lowering, the load transfer is performed by a separate, simpler element that can tilt or rotate independently. This separates the functions of rotation support and load transfer, simplifying the overall device complexity.
Solution Approach 2:
The load transfer element acts as an intermediary between the sash and the frame. Rather than requiring the pivot bearings to directly accommodate position changes, the intermediary element absorbs the complexity of adapting to rotational movement while maintaining simple pivot bearing designs. The intermediary element tilts or rotates to accommodate movement without transferring this complexity to the pivot bearings.
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
Ensures easier rotary opening and closing of the sash by maintaining a constant vertical distance between the load-bearing and coupling parts, allowing effective load transfer without sash lowering or raising, regardless of the rotational position.
Implementation Method 1
a rotary connection section which comprises a sleeve with an internal thread and a pin with an external thread which is rotatably accommodated in the sleeve, the sleeve and the pin forming a helical gear
Data Source
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AI summary
The unit (14) has a frame-sided load accommodating part (16) fastenable at a frame (10). The load accommodating part and a leaf-sided coupling part (18) are rotatably connected with each other by a load deflection element (20) so that a part of weight force of the leaf is transferred from the coupling part to the load accommodating part via the element in a mounted state. The load accommodating part and coupling part are fixed in a defined distance (d) to each other by the element, where the distance is changeable with rotation angle between the load accommodating part and coupling part. An independent claim is also included for a window or door comprising rotary bearings.