LIGHTPROOF JALOUSIE Russian patent published in 1996 - IPC

FIELD: civil engineering. SUBSTANCE: jalousie has a bearing case, a set of horizontal lamellars, lower lath/weight, flexible small ladders with lamellars and lower lath installed on them, device for lifting lamellars and lower lath, braking device to hold lamellars and lower lath at predetermined height, and provided with an actuator mechanism to turn back lamellars in horizontal surfaces. The mechanism to turn back lamellars is made in the form of screw pair such as rotary shaft and carriage. Above mechanism has fasteners to hold rotary shaft of the carriage, flexible ladders, as well as members to couple the actuator to it. Rotary shaft is installed on barrels laid down in supports. Fasteners of the ladders are made on the barrels, and fasteners of actuator/mechanism coupling made in the form of two flexible pullers are made on the carriage. Other geometric parameters are provided for screw surfaces of mate parts of the screw pair. Angle of helical line rise exceeds friction angle in this pair that provides conditions for self-braking when transmitting force screw/nut. EFFECT: effective overlapping window aperture. 6 dwg