Four-Bar Window Stay Stops for 90-Degree Opening Stability
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Solution Overview
Problem
Current four-bar window stays face challenges in reducing cost, size, and improving durability and weight-carrying capacity while maintaining effective operation for 90-degree opening and cleaning access.
Innovation Solution
The design incorporates a frame and sash mounting plate with strategically placed stops, strengthening forms, and washers integrated into the arms, along with a disk for enhanced stability and load distribution, and a rivet with a concave underside to prevent washer extrusion, ensuring the window stay can withstand dynamic loads without buckling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the window stay is designed to open to 90 degrees for cleaning access, then cleaning accessibility is improved, but the structural stability and load-carrying capacity deteriorate
Solution Approach 1:
The window stay employs a dynamic four-bar linkage mechanism that allows the sash to be opened to 90 degrees for cleaning access while automatically returning to a stable closed position. The mechanism uses the relative motion between the short and long arms to achieve both operational flexibility and structural stability through controlled movement ranges.
Solution Approach 2:
The invention changes the geometric parameters of the four-bar linkage, specifically the lengths and pivot positions of the short and long arms, to optimize the balance between opening angle (90 degrees for cleaning) and structural rigidity. By adjusting these parameters, the mechanism achieves sufficient load-carrying capacity while maintaining the required operational range.
2Length of moving object
If the arm length is reduced to minimize size, then the compactness is improved, but the weight-carrying capacity deteriorates
Solution Approach 1:
The invention uses asymmetric arm design where the long arm and short arm have different lengths and cross-sectional properties optimized for their specific functional requirements. The long arm is designed with sufficient length to provide leverage and control the 90-degree opening, while the short arm is minimized for compactness. This asymmetric configuration allows each arm to be optimally sized for its role, achieving both compactness and weight-carrying capacity.
Data Source
AI summary
A window stay including a frame mounting plate (10); a sash mounting plate (11); a short arm (12) coupled by pivots at each end to the frame mounting plate (10) and the sash mounting plate (11); and an elongate long arm (13) coupled by pivots at each end to the frame mounting plate (10) and sash mounting plate (11), wherein the stay includes a first stop (33) and a second stop (102) acting as limiters at a fully open position of the window stay.