Patent ID: 11946312
Assignee: nan
Field: Civil engineering (Other fields)
Classification: CPC E | IPC E

Claim 1:
2. The apparatus of claim 1, wherein:
said screen rollup assembly comprises said shafted self-storing roller unit, a second section of insect screen fabric, a second section of impervious membrane and a supplementary section of insect screen fabric;
said second section of insect screen fabric having a top horizontal end attached along the weather-side face of said lower sash's bottom rail and having a width matching the width of said lower sash and having a length approximately twice as great as the maximum distance said lower sash may travel for ventilation;
said second section of impervious membrane, being impervious to wind and precipitation and resistant to passage of light, is possessed with a width matching the width of said second section of insect screen fabric and a length at least as great as the height of the window opening from head to sill but not more than the sum of twice said height of the window opening from head to sill less the maximum distance said lower sash may travel for ventilation;
said supplementary section of insect screen fabric, having a horizontal bottom end attached to said rollup shaft and a top horizontal end attached along the bottom horizontal end of said second section of impervious membrane, said supplementary section of insect screen fabric is possessed with a width matching the width of said second section of insect screen fabric and a length such that the sum total length of said supplementary section of insect screen fabric and said second section of said impervious membrane equals at least twice the height of the window opening from head to sill plus twice the width of said head member from weather-side to room-side;

whereby, when said rod is raised to said fully-raised position, said room-side is shaded against sunlight and is furnished visual privacy; and
whereby, when said rod is raised to said fully-raised position and then said lower sash is moved vertically away from said sill member from a closed position to a ventilation position, said connected sections of insect screen fabric and impervious membrane align such that ventilation air may pass through said window opening from weather-side to room-side.