| 摘要 |
The window escape descent control device for emergency use from upper windows of tall buildings comprises a body harness supported on the end of a rope wound around a flanged spool. The spool, when turned by the unwinding rope pulled by the weight of an escaper in the body harness, turns the shaft and an electrical generator operatively mounted thereon. The shaft also carries, and is controlled by, an electromagnetic brake and a speed control governor, which may be either centrifugally or optically operated and which, when a predetermined rate of shaft rotation is reached, causes energy to be released from the generator to actuate and apply the brake to the shaft; thus the rate off all of the escaper cannot exceed a pre-selected maximum. The mechanism is mounted on a frame support structure straddling and depending from the escape window ledge. The frame strucutre provides hand and foot support to aid the escaper in climbing out the window and in getting into position for descent. Means for rewinding the rope onto the spool for another escape descent from the same window is also provided.
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