Roof Window Mullion Dynamics for Aperture Utilization
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Solution Overview
Problem
Existing roof window arrangements do not fully utilize the aperture created in the roof structure due to the presence of mullions, which divide the aperture into smaller openings.
Innovation Solution
A roof window arrangement where at least one window unit has an openable pane-carrying sash that opens about a horizontal centre hinge axis, and the window units can be configured to open as a common openable sash in a second operational condition, allowing for better utilization of the roof aperture.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If mullions are used to separate window units in a roof window arrangement, then structural stability and individual window operation are improved, but the aperture utilization is reduced because the aperture is divided into smaller openings
Solution Approach 1:
The mullion is designed with dynamic functionality, allowing it to switch between a fixed state (when window units are closed) and a movable state (when window units open). The mullion can be coupled to the common stationary frame or decoupled therefrom, enabling it to move together with the window units during opening operation. This dynamic characteristic allows the mullion to maintain structural stability when needed while enabling full aperture utilization during window operation.
2Ease of operation
If mullions are fixed to the common stationary frame, then individual window unit operation is enabled, but the ability to utilize the full aperture as a single opening is lost
Solution Approach 1:
The coupling mechanism between the mullion and common stationary frame is designed to be reversible. The mullion can be coupled to enable individual window operation, and decoupled to enable common opening of all window units together. This dynamic coupling capability provides adaptability and versatility, allowing the roof window arrangement to switch between different operational modes as needed.
Solution Approach 2:
The mullion serves multiple functions: it provides structural separation and stability when window units are closed, enables individual window operation when coupled to the frame, and allows common opening of all windows when decoupled. This multi-functionality resolves the contradiction between individual operation capability and common opening capability.
3Strength
If the aperture is divided into smaller openings by mullions, then structural support and hinge arrangement are improved, but light influx and fire escape functionality are reduced
Solution Approach 1:
The mullion's ability to move with the window units during opening operation allows the aperture to be fully utilized when windows are open. When window units are opened individually or together, the mullion decouples from the stationary frame and moves accordingly, eliminating the division effect and maximizing light influx and fire escape functionality while maintaining structural support when closed.
Data Source
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AI summary
A roof window arrangement comprising a common stationary frame and at least a first window unit and a second window unit. A roof window arrangement comprising a common stationary frame configured to be built into a roof surface and at least a first window unit and a second window unit configured in a side-by-side configuration, where each window unit comprises a pane-carrying sash where at least one of the window units has an openable pane-carrying sash which opens about a horizontal centre hinge axis defined by a set of hinges arranged substantially at the centre of the window units in a height direction in a first operational condition and where the at least first window unit and second window unit are configured to open as a common openable sash in a second operational condition.