Safety remote control for a carrier

Claim 1

A CONTROL FOR A CARRIER COMPRISING A FIRST TRANSMITTER FOR TRANSMITTING A FIRST SIGNAL OF KNOWN FREQUENCY, A SECOND TRANSMITTER FOR TRANSMITTING A SECOND SIGNAL HAVING A FREQUENCY SUBSTANTIALLY DIFFERENT THAN THAT OF THE FIRST TRANSMITTER, SAID TRANSMITTERS BEING AT A POSITION REMOTE FROM SAID CARRIER, A FIRST RECEIVER MOUNTED ON SAID CARRIER FOR RECEIVING THE SIGNAL TRANSMITTED BY SAID FIRST TRANSMITTER, A DETECTOR CONNECTED TO THE OUTPUT OF SAID FIRST RECEIVER, A LIMITER CONNECTED TO OUTPUT OF SAID DETECTOR, SAID LIMITER INCLUDING A FIRST TRANSISTOR CONNECTED TO RECEIVE THE OUTPUT OF SAID DETECTOR, DISCRIMINATOR MEANS CONNECTED TO THE OUTPUT OF SAID LIMITER FOR DETECTING AND DISTINGUISHING THE FREQUENCY OF SAID FIRST SIGNAL, AN ELECTRICAL POWERED DEVICE, SECOND MEANS OPERABLE BY THE OUTPUT OF SAID DISCRIMINATOR MEANS FOR OPERATING SAID DEVICE, A SILICON CONTROLLED RECTIFIER CONNECTED IN CIRCUIT WITH SAID TRANSISTOR AND SWITCHED ON BY SAID TRANSISTOR, A POWER SOURCE, A FIRST RELAY COIL CONNECTED INSERIES WITH SAID SILICON CONTROLLED RECTIFIER TO SAID POWER SOURCE TO ALLOW CURENT TO PASS THROUGH SAID RELAY COIL WHEN THE SILICON CONTROLLED RECTIFIER IS TURNED ON, A FIRST TUNED CIRCUIT TUNED TO THE SECOND SIGNAL FREQUENCY FOR PICKING UP A SIGNAL FROM SAID SECOND TRANSMITTER, A SECOND TUNED CIRCUIT AND TUNED TO THE FREQUENCY OF SAID FIRST TUNED CIRCUIT AND INDUCTIVELY COUPLED THERETO, RECTIFIER MEANS CONNECTED TO THE OUTPUT OF SAID SECOND TUNED CIRCUIT FOR PASSING ONE PORTION OF THE OUTPUT SIGNAL, A SECOND TRANSISTOR, A SECOND RELAY COIL CONNECTED IN SERIES WITH SAID SECOND TRANSISTOR TO SAID POWER SOURCE, MEANS CONNECTING THE OUTPUT OF SAID RECTIFIER MEANS TO SAID SECOND TRANSISTOR TO SWITCH THE TRANSISTOR ON AND ALLOW CURRENT TO PASS FROM SAID POWER SOURCE TO SAID SECOND RELAY COIL, POWER SUPPLY MEANS FOR SAID DEVICES, A NORMALLY OPEN CONTACT ASSOCIATED WITH EACH OF SAID RELAY COILS, SAID RELAY COIL CLOSING SAID CONTACTS WHEN THEY ARE ENERGIZED TO PERMIT FLOW OF ELECTRICITY FROM SAID POWER SUPPLY MEANS TO SAID ELECTRICAL POWER DEVICE WHEN SAID SECOND MEANS TO OPERABLE.