| 摘要 |
A door system including a door movable between a closed vertical position and an open horizontal position, a cable interconnected to said door near the bottom thereof, the cable extending along a vertical line adj acent the door and being normally, substantially taut, and an anti-drop assembly having a pawl pivotally supported on the door, a stop surface formed adjacent the door and a spring operable to urge the pawl toward engagement with the stop surface, wherein the pawl is oriented such that it rotates in a plane passing through the cable and placed in contact therewith such that the taut cable opposes the biasing force of the spring, whereby upon the cable going slack, the spring biases the pawl into engagement with the stop surface to decelerate the door. |
