Roof Window Hinge With Rolling Friction Near Closed Position
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Solution Overview
Problem
Existing roof window hinges experience increased friction during closing, particularly when the window is nearly closed, making it difficult to operate due to varying friction forces between the hinge gutter and sledge assembly.
Innovation Solution
The hinge incorporates a friction reduction means, such as a different material for the gutter bottom fragment, a roller, or a roller assembly, to transition from sliding to rolling friction, reducing friction between the slider and gutter, especially when the window is nearly closed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a conventional hinge with slider and gutter is used, then the window can be opened and closed, but friction increases when the window is nearly closed, making it difficult to operate
Solution Approach 1:
The patent changes the friction parameter by introducing a friction reduction means (roller or low-friction material) that activates when the support reaches its end position. This transforms the high sliding friction into low rolling friction or reduces the friction coefficient, thereby reducing the closing force required when the window is nearly closed.
Solution Approach 2:
The friction reduction means acts as an intermediary element between the slider and the gutter. When the support is in its end position, this intermediary component reduces the direct contact friction between the slider and gutter, facilitating easier closing operation.
2Reliability
If the support exerts pressure on the jamb side stile to hold the window position, then the window can be held in various positions, but the friction between gutter and sledge assembly increases, hindering easy closing
Solution Approach 1:
The patent applies local quality by making the friction characteristics position-dependent. The gutter bottom has different friction characteristics in different sections: higher friction in the first section (for holding function) and lower friction in the second section (for easy closing). The friction reduction means is specifically positioned to activate only when needed during closing operation.
Solution Approach 2:
The friction characteristics of the hinge system are made dynamic rather than static. The friction reduction means activates dynamically based on the support's position, providing high friction when the window needs to be held and low friction when closing is required, thereby resolving the contradiction between holding reliability and closing ease.
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 significantly eases the closing force required by reducing friction, allowing the window to close more easily by changing the friction coefficient type from sliding to rolling, thus minimizing the effort needed to return the support to a parallel position with the jamb side stile.
Implementation Method 1
The hinge incorporates a friction reduction means, such as a different material for the gutter bottom fragment, a roller, or a roller assembly, to transition from sliding to rolling friction, reducing friction between the slider and gutter
Data Source
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AI summary
Roof window hinge comprising following elements: an intermediate arm (1), rotatably attached to a gutter (4), wherein the gutter (4) is designed for mounting on window jamb side stile (31), a sledge assembly (6) and a support (8), wherein the support (8) is rotatably attached to a intermediate arm spigots, and to the sledge assembly (6), wherein the support (8) with the sledge assembly (6) assume end positions along section (S1) of path (S) of the sledge assembly along the gutter (4)where it comprises a friction reduction means (9, 10) between sledge assembly (6) and the gutter bottom along section (S1) of path (S).