Curtain control system for animal enclosures

In a curtain control system for controlling curtains of an animal enclosure having an electrically-operated forced air ventilation system and a plurality of adjustable drop curtains, each of said drop curtains having an associated curtain control device for providing supplemental ventilation during power failure or excess temperatures in the enclosure;

• each of the curtain control devices including a winch for winding and unwinding a curtain control cord extending between the curtain and the winch, the winch having stop means for holding the winch, winch release means moveable between a hold position for normally holding the winch handle stationary to prevent unwinding of the curtain control cord and a release position to release the winch handle and thereby release of the curtains to a dropped, open position;
• electromagnet means for holding the winch release means in the hold position during application of current thereto, and permitting movement of the winch release means to the release position upon interruption of electric current to the electromagnet means;
• the improvement comprising:
• (a) circuit means electrically cooperating with the electromagnet means for interrupting the flow of electricity to all of the curtain control devices upon movement or change of any single winch release means to the release position to thereby cause the release of all of the curtains upon the release of any of the curtains.