Patent ID: 6224481
Filing Date: 2001-05-01
Classification: A62C

Abstract:
A powered damper assembly, comprising:a damper, further comprising:a damper frame; andat least one damper blade pivotally attached to the damper frame such that it has an open position to allow air flow and a closed position to prevent air flow through the damper frame;a power actuator cycling means attached to the damper, said powered actuator cycling means comprising a pneumatic drive assembly connected to a source of pneumatic pressure; anda movable shaft means, movably attached at one end to the powered actuator cycling means and attached at its other end to the damper blade such that the powered actuator cycling means can move the shaft means and cause the damper blade to move and cycle between an open position and a closed position a source of pneumatic pressure; means to change the level of pneumatic pressure; and opposing pressure means set in opposition to the pneumatic pressure and providing opposing pressure such that a change in the level of pneumatic pressure in relation to the opposing pressure means will result in movement of the movable shaft; whereby movement of the damper blades is selectively controlled by varying the pneumatic pressure.