Radio control system for operating a distant electromechanical transducer door lock utilizing a capacity-sensitive circuit at the distant location and an operator-carried transceiver

Claim 1

A RADIO CONTROL SYSTEM FOR OPERATING A DISTANT ELECTROMECHANICAL TRANSDUCER DOOR LOCK COMPRISING; A TRANSMITTER CIRCUIT FOR GENERATING ALTERNATING CURRENT POWER AT A FIRST FREQUENCY; SAID TRANSMITTER CIRCUIT HAVING A POWER SUPPLY AND AN OSCILLATOR WHICH INCLUDES A FIRST INDUCTOR FOR CREATING AN ALTERNATING MAGNETIC FIELD AT A DISTANCE; A CAPACITY-SENSITIVE CIRCUIT INCLUDING A RELAY COUPLED TO A CONDUCTOR FOR ACTUATION OF THE RELAY BY A CHANGE OF CAPACITY APPLIED TO THE CONDUCTOR MEANS CONNECTED TO SAID CAPACITY-SENSITIVE CIRCUIT TO INITIATE OPERATION THEREOF; CONTACTS ON THE RELAY CONNECTED IN SERIES WITH SAID POWER SUPPLY FOR ACTUATING THE OSCILLATOR; AT LEAST ONE PORTABLE TRANSCEIVER CIRCUIT FOR RECEIVING POWER FROM SAID MAGNETIC FIELD AT ESSENTIALLY THE SAME TIME AS SAID OPERATION OF THE CAPACITY SENSITIVE CIRCUIT IS INITATED AND FOR TRANSMITTING A RADIO SIGNAL HAVING A SECOND FREQUENCY, MODULATED BY SAID FIRST FREQUENCY; SAID TRANSCEIVER INCLUDING A SECOND INDUCTOR AND A RECTIFIER CONNECTED IN SERIES FOR PRODUCING PULSATING CURRNT POWER; AN OSICILLATOR CIRCUIT CONNECTED TO SAID SECOND INDUCTOR FOR GENERATING MODULATED ALTERNATING CURRENT POWER AT SAID SECOND FREQUENCY, AND AN ANTENNA TUNED TO SAID SECOND FREQUENCY FOR BROADCASTING SAID RADIO POWER; A RADIO RECEIVER FOR RECEIVING THE MODULATED RADIO WAVES FROM ANY ONE OF SAID TRANSCEIVER AT THE SECOND FREQUENCY AND FOR RECTIFYING THE RECEIVED CURRENTS TO PRODUCE A SERIES OF CURRENT PULSES AT SAID FIRST FREQUENCY; SAID RECEIVER INCLUDING AN ANTENNA TUNED TO SAID SECOND FREQUENCY, A RECTIFYING MEANS CONNNECTED TO SAID ANTENNA, A RESONANT CIRCUIT CONNECTED TO SAID RECTIFYING MEANS AND TUNED TO SAID FIRST FREQUENCY, AND CIRCUIT MEANS COUPLED TO SAID RESONANT CIRCUIT FOR APPLYING SAID SERIES OF CURRENT PULSES TO SAID ELECTROMECHANICAL TRANSDUCER FOR MECHANICAL ACTUATION THEREBY.