Sliding Window Interlocking Hooks for Windload Resistance
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Solution Overview
Problem
Window assemblies in coastal regions face challenges in withstanding high windloads during hurricanes or tornadoes, leading to potential deformation and separation of sash frames from main frames, especially when glass panels are subjected to impact.
Innovation Solution
A sliding window assembly with interlocking hook members formed from rigid PVC extrusions, where parallel frame members engage to limit deflection and prevent permanent deformation under both positive and negative windloads, ensuring the sash frames remain connected to the main support frame.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional window assemblies are used in coastal regions, then the window assembly can be installed with standard components, but the sash frame may deform or separate from the main frame during high windloads
Solution Approach 1:
The window assembly is divided into modular components including the main frame, sash frames, and interlocking members that can independently engage and disengage. The interlocking members are segmented with hook portions and interfitting portions that allow controlled movement and locking
Solution Approach 2:
The interlocking members are pre-positioned on the main frame and sash frames during manufacturing, with hook portions and interfitting portions already configured to engage automatically when the sash frame moves into the closed position, eliminating the need for separate installation steps
2Reliability
If the sash frame is designed to remain firmly connected to the main frame, then windload resistance is improved, but the sash frame cannot be easily removed for cleaning or maintenance
Solution Approach 1:
The connection between the sash frame and main frame transitions from a static fixed connection to a dynamic controlled connection. The interlocking members allow the sash frame to move freely during normal operation, automatically lock under windload conditions, and can be easily disengaged when needed for maintenance
Solution Approach 2:
The interlocking members are designed to automatically engage and lock the sash frame to the main frame when windload is detected, without requiring external intervention. The system self-adjusts to provide enhanced connection stability when needed
3Strength
If rigid PVC extrusions are used for frame members, then strength and rigidity are improved, but the complexity of the interlocking mechanism increases
Solution Approach 1:
The interlocking members are merged with the main frame and sash frames as integral components, with hook portions and interfitting portions formed as part of the extrusion profiles. This integration reduces the number of separate parts and simplifies assembly while maintaining connection stability
Data Source
AI summary
A sliding window assembly includes two rectangular sash frames each enclosing an insulated glass panel unit and supported by a surrounding main support frame. At least one of the sash frames is supported for horizontal movement, and horizontally extending interlocking members are formed on the adjacent upper and lower horizontal frame members of the sash frame and main support frame. The interlocking members have interfitting horizontal hook portions positioned to permit each movable sash frame to move freely between a closed position and an open position. The interfitting hook portions are effective to engage and interlock each other in response to a substantial positive or negative windload or such a windload after an impact which breaks the glass panel unit, to limit deflection and prevent permanent deformation or release of the sash frame.