Centre-Hung Window Screening Arrangement
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Solution Overview
Problem
Centre-hung windows with existing screening arrangements face challenges such as restricted sash movement, laborious cleaning, visibility of screens, and reduced ventilation due to elaborate designs, which compromise the functionality and aesthetics of the window.
Innovation Solution
A discreet screening arrangement where elements are integrated exclusively at the top and/or bottom members of the sash and frame, allowing for automatic operation and minimal material usage, with options like flaps, curtains, or sliders that deploy automatically in the ventilating position and retract when closed, ensuring efficient ventilation and easy operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a centre-hung window is equipped with a screening arrangement that covers all openings when tilted, then insect screening effectiveness is improved, but sash movement is restricted and cleaning becomes laborious
Solution Approach 1:
The screening arrangement is divided into two separate screens: one screen is fixed to the frame and the other screen is fixed to the sash. This segmentation allows each screen to independently cover openings during different phases of window operation, providing continuous insect protection while maintaining full sash movement capability and easy cleaning access.
Solution Approach 2:
The screening system transitions from a static single screen to a dynamic two-screen configuration that adapts to window position. When the window is closed, both screens remain retracted; when tilted to a ventilating position, both screens deploy to cover the openings. This dynamic behavior provides insect screening only when needed, eliminating restrictions on sash movement and cleaning operations.
2Object-affected harmful factors
If a fixed construction screen conforming to maximum ventilation opening is used, then screening coverage is improved, but the screen becomes voluminous and visible from inside
Solution Approach 1:
The screen transitions from a fixed voluminous construction to a dynamic deployable system. The screen elements are designed to remain retracted and invisible during normal closed window operation, and only deploy to provide screening coverage when the window is tilted to a ventilating position. This eliminates the problem of permanent visibility and reduces the apparent volume of the screening arrangement.
Solution Approach 2:
The screen elements are designed to nest within the window frame and sash structure when not in use. The screening material can be folded or rolled into a compact configuration that fits within the available space at the interface between frame and sash, making the screen invisible from both inside and outside when the window is closed.
3Object-affected harmful factors
If a screen is mounted on the inside of the window, then screening effectiveness is improved, but the screen is visible at all times from inside and requires reassembly when folded away
Solution Approach 1:
The screening function is segmented between two separate screens mounted on opposite sides of the window. One screen is mounted on the frame (outside) and the other on the sash (inside). This segmentation allows the inside screen to be positioned such that it is not visible from the interior when the window is closed, while still providing effective screening when deployed during ventilation.
Solution Approach 2:
The screen transitions from a permanently visible static mounting to a dynamic deployable system. The screen elements are designed to remain concealed within the window structure during closed position and only become visible and functional when the window is tilted to a ventilating position, eliminating the aesthetic drawback of permanent visibility.
4Object-affected harmful factors
If an elaborate screening arrangement is used to provide maximum protection, then insect screening effectiveness is improved, but ventilation is restricted and material usage increases
Solution Approach 1:
The screening arrangement transitions from a static elaborate structure to a dynamic system that provides screening only when needed. The screens are designed to deploy and provide insect protection during ventilating positions, then retract to allow unrestricted airflow when the window is fully open or closed, maximizing ventilation efficiency while maintaining screening effectiveness during ventilation operations.
Solution Approach 2:
The screening system utilizes changes in window position parameters to control screen deployment. When the window tilt angle indicates a ventilating position, the screens deploy to provide insect protection. When the window is closed or fully open, the screens retract. This parameter-based control allows the system to provide maximum protection during ventilation while minimizing material obstruction to airflow during non-ventilating positions.
Data Source
AI summary
The window (1) comprises a frame (2) having a top member (3), a bottom member (4) and two side members (6), and a sash (7) having a top member (8), a bottom member (9) and two side members (10, 11). A screening arrangement (12) is provided in order to cover the ventilating aperture at least partly in the ventilating position. To achieve a discreet screening arrangement having minimum influence on the functioning of the window, the screening arrangement (12) includes at least one screening element (13, 23, 33), which, in a closed position of the window (1), is arranged in a storage position at the interface between frame (2) and sash (7), and in the ventilating position extends between the frame bottom member (4) and the sash bottom member (9), and/or between the frame top member (3) and the sash top member (8). Each of the screening elements (13, 23, 33) is connected with the sash or frame top or bottom member (8, 3, 9, 4) and is in releasable engagement with the corresponding frame (3, 4) or sash member (8, 9) within the limited angle range.