| 摘要 |
<p>Transmission device for the telecontrol of hoisting winches for lifts or nacelles for the transportation of loads or persons, by means of electric signals transmitted by the carrier cable. Said device is characterized in that the emitter unit (4) comprises a coder (8) connected to a keyboard (9) and emitting alternating signals having a first or a second frequency in the range from 300 to 3000 Hz, according to the value of the binary digit to be transmitted, and the receiver unit (6) comprises an amplifier stage (14) connected to the receiver coupling coil (7) and which supplies on one hand a decoder (21) acting on control relays and on the other hand a telephone receiver (19).</p> |
