Curtain control system for poultry houses
US 3973173 A
บทคัดย่อ
The side curtains of a poultry house are automatically opened upon a power failure in the electrical circuit of the ventilating system. An electrical monitoring circuit activated responsive to such power failure, releases a winch which normally maintains the curtains in a closed position, causing them to drop to an open position. The electrical monitoring system includes a time delay relay which is activated upon the power failure to release a normally latched mechanism. A latching cable is thus released, freeing the winch.