| 摘要 |
<p>QUADRANT OPERATOR .. . . A novel operator for use with a damper is disclosed comprising a plurality of pivotally interconnected damper operator members which are pivotally associated with the damper blade linkage and frame, such that they may be moved to an over-center locking position to lock the damper blades in their desired fire actuated positions. The operator also comprises an actuator means for selectively acting through the operator to control the degree of blade opening, and a releasing device for responding to various activation conditions such as heat, for disengaging the actuator from the operator members to facilitate closure and automatic locking of the blades. The operator members may assay be springed biased to automatically accomplish blade c1osure .</p> |
