| 摘要 |
A system for monitoring an elevator door in a hoistway. The elevator door is moveable between a closed position and an open position. The system comprises a transmitter for emitting an optical signal and an interlock device for latching the elevator door. The interlock device includes an optical nosepiece so positioned for receiving, guiding, and outputting the optical signal from the transmitter when the elevator door is closed and the interlock device is in the latched state. A receiver receives the optical signal via the nosepiece only when the elevator door is closed and the interlock is latched to therebz indicate the elevator door is in its latched state. |
