Spring Load Transfer Device for Window Sash Wear Reduction
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Solution Overview
Problem
Existing window and door sash load transfer systems face challenges in efficiently supporting heavy sashes without impairing corner fittings, and in accommodating different sash sizes with a single set of components, leading to issues like increased wear and the need for separate components for varying sash weights.
Innovation Solution
A sash load transfer device with a spring arrangement supported on the movable part, which includes a vertically acting spring force component that is always smaller than the vertical weight force component, allowing for efficient load distribution and compensation for distance changes between abutment arrangements, enabling the use of a single corner fitting for various sash sizes and reducing wear by distributing the load through a spring mechanism.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If a support rod is used to transfer the weight of the wing, then the load is transferred to the fixed frame, but the distance between pivot points changes during opening causing vertical lowering movement and increased wear at the upper end
Solution Approach 1:
The patent applies a spring element that can dynamically adjust its length to compensate for changing distances between abutment arrangements during sash movement. This dynamic adjustment eliminates rigid contact and wear at the upper end of the support rod while maintaining continuous load transfer capability throughout the opening sequence.
Solution Approach 2:
The spring element acts as an intermediary between the support rod and the abutment arrangement, absorbing distance changes and wear through its elastic deformation. This mediator protects the rigid support rod from direct contact wear while maintaining the load transfer function.
2Force
If corner fittings are designed to handle heavy sashes, then load transfer is improved, but the complexity of fittings increases and different components must be stored for different sash sizes
Solution Approach 1:
The patent divides the load transfer function into two independent parts: the corner fitting handles positioning and rotation, while the separate load transfer device with spring element handles weight support. This segmentation allows each component to be simpler and standardized across different sash sizes.
Solution Approach 2:
The load transfer device with the spring element is designed as a universal component that can accommodate different sash weights and sizes through its elastic adjustment capability, eliminating the need for multiple specialized corner fittings for different applications.
3Force
If the spring force component equals the weight force component, then the sash is fully supported, but the sash moves vertically upwards during opening or closing
Solution Approach 1:
The spring element is designed to provide partial support to the sash weight rather than full support, with the corner fitting providing the remaining support. This partial action prevents excessive upward movement while still significantly reducing the load on the corner fitting and eliminating wear at the support rod's upper end.
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 effectively supports heavy sashes without vertical movement during opening or closing, allows for the use of a single corner fitting across different sizes, and minimizes wear by adjusting the spring force in response to distance changes, thus ensuring reliable and space-saving load transfer.
Implementation Method 1
a spring arrangement (21) which is supported on the movable part (20) and compensates for a distance change occurring at least between stationary parts of the abutment arrangements (8, 9) during an opening and/or closing process of the wing (1)
Data Source
Figure 1
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AI summary
The window or door has an attached enclosure and an opening and closing flank (1). A spacer balance mechanism includes a spring assembly. The elasticity component causes a vertically working. A vertical weight component of the weight is arranged against the flank or the load flank and is always smaller than the vertical weight component.