Window Stay Synchronization via Merged Guide Rail
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Solution Overview
Problem
Existing window and door opening devices have high production costs, complex assembly, and limited space-saving capabilities due to excessive components and material requirements, leading to inefficient synchronization of opening movements.
Innovation Solution
A device using a combination of Y and X scissor stays with a rigid connecting element on the frame-side guide rail, where the sash-side end of the control lever is rotatably connected via a bearing block and the wing-side end of the control lever is mounted linearly and rotatably via a sliding shoe, reducing material usage and assembly complexity while allowing adjustable synchronization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a rigid connecting element connects the frame-side ends of both deployment levers, then synchronization of opening movement is improved, but device complexity and material requirements increase
Solution Approach 1:
The patent combines the functions of the rigid connecting element and the frame-side guide rail into a single integrated component. The guide rail serves both as a linear guide for the deployment levers and as the connecting element that synchronizes their movement, eliminating the need for a separate rigid connecting structure and reducing overall device complexity while maintaining synchronization.
Solution Approach 2:
The frame-side guide rail is designed to perform multiple functions simultaneously: it guides the linear movement of the deployment levers, provides structural support, and acts as the synchronizing connecting element between both levers. This multi-functionality reduces the total number of components needed in the system.
2Manufacturing precision
If four guide rails are provided (two per scissor stay), then guidance precision is improved, but production costs and assembly effort increase
Solution Approach 1:
The patent extracts and eliminates the frame-side guide rails from the system by integrating their guiding function into the redesigned scissor mechanism. The scissor stays are configured to self-guide through their geometric arrangement, removing the need for separate guide rail components and simplifying manufacturing.
Solution Approach 2:
The guiding function previously performed by separate guide rails is merged into the scissor stay structure itself. The interconnected geometry of the scissor mechanism provides inherent guidance, eliminating the need for additional guiding components and reducing assembly complexity.
3Ease of manufacture
If the connecting element is only connected to deployment levers in the lower area, then assembly is simplified, but synchronization of deployment movement deteriorates
Solution Approach 1:
The patent transitions from a single-point connection in the lower area to a distributed connection system along the vertical dimension. The rigid connecting element spans the vertical distance between the upper and lower deployment lever connection points, creating a moment connection that ensures synchronized movement throughout the entire range of motion while maintaining assembly simplicity.
4Loss of substance
If two Y-opening scissor stays are used, then material usage is reduced, but structural stability deteriorates
Solution Approach 1:
The patent creates a composite structural system by combining two Y-opening scissor mechanisms with a rigid connecting element. The composite structure leverages the material efficiency of the Y-configuration while the rigid connector provides the additional structural stability and synchronization needed, achieving both material reduction and enhanced stability through the combined system.
Data Source
Figure 1
Figure 2
AI summary
The device (1) has control levers (8, 9) rotatably connected with raising levers (4, 5) of two Y-shaped stay arms (2, 3). A frame-side end of both the raising levers is linearly movable and rotatably mounted on a frame-side guide rail (6) i.e. C-rail. The frame-side end is connected with a rigid connecting element (7) i.e. flat bar, through the frame-side guide rail. A leaf-side end of both the raising levers is rotatably connected with a leaf of a window or a door through bearing blocks (10, 11), which are rotatably connected to the leaf.