Flip-flop alarm system with lamp test circuit

Claim 1

A MULTI-TONE DECODING AND SIGNALLING DEVICE COMPRISING, A TONE SIGNAL INPUT CIRCUIT, FIRST, SECOND AND THIRD RESONANT RELAYS EACH HAVING A CONTROL WINDING CONNECTED ACROSS SAID TONE SIGNAL INPUT CIRCUIT AND EACH HAVING POWER INPUT AND OUTPUT CONNECTIONS AND EACH RESONANT RELAY BEING RESPONSIVE ONLY TO FIRST, SECOND AND THIRD TONE SIGNALS OR RESPECTIVELY DIFFERENT FREQUENCIES, A POWER SUPPLY CIRCUIT INCLUDING TWO CONDUCTORS OF OPPOSITE POLARITY, A FIRST CAPACITOR AND CHARGING CIRCUIT THEREFOR CONNECTED TO SAID POWER SUPPLY CIRCUIT AND THE POWER OUTPUT CONNECTION OF THE FIRST RESONANT RELAY FOR CHARGING SAID FIRST CAPACITOR UPON ENERGIZATION OF THE CONTROL WINDING OF THE FIRST RESONANT RELAY BY A FIRST TONE SIGNAL, FIRST AND SECOND SWITCHING TRANSISTORS EACH HAVING CONTROL ELEMENTS RESPECTIVELY CONNECTED TO THE POWER OUTPUT CONNECTIONS OF SAID SECOND AND THIRD RESONANT RELAYS, FIRST AND SECOND RELAY MEANS INCLUDING CONTROL WINDINGS RESPECTIVELY ASSOCIATED WITH SAID FIRST AND SECOND TRANSISTORS AND HAVING CERTAIN CONTACT AND ARMATURE PAIRS WHICH ARE NORMALLY CLOSED WHEN THEIR WINDINGS ARE DE-ENERGIZED AND CERTAIN OTHER CONTACT PAIRS WHICH ARE CLOSED WHEN THEIR WINDINGS ARE ENERGIZED, A PAIR OF POWER CIRCUITS ACROSS SAID POWER INPUT CONDUCTORS AND RUNNING RESPECTIVELY THROUGH CONTROLLED ELEMENTS OF SAID FIRST AND SECOND TRANSISTORS AND THE CONTROL WINDINGS OF THE FIRST AND SECOND RELAY MEANS RESPECTIVELY ASSOCIATED THEREWITH, SAID FIRST AND SECOND RELAY MEANS EACH INCLUDING A FIRST NORMALLY OPEN CONTACT AND A ARMATURE PAIR FOR ESTABLISHING A TRANSISTOR ON-SWITCHING CIRCUIT FROM SAID FIRST CAPACITOR TO THE POWER INPUT CONNECTIONS OF SAID SECOND AND THIRD RESONANT RELAYS RESPECTIVELY WHEN SAID FIRST AND SECOND RELAY WINDINGS ARE DE-ENERGIZED AND FOR BREAKING SAID TRANSISTOR ON-SWITCHING CIRCUIT WHEN SAID RELAY WINDINGS ARE ENERGIZED, MEANS FOR NORMALLY BIASING THE CONTROL ELEMENTS OF SAID TRANSISTORS TO OFF SWITCHED STATES, A HOLDING CIRCUIT FOR EACH RELAY MEANS WINDING ESTABLISHED THROUGH A NORMALLY CLOSED CONTACT AND ARMATURE PAIR OF THE OTHER RELAY MEANS AND EACH BEING OPENED UPON ENERGIZATION OF THE OTHER RELAY MEANS WINDING, WHEREBY THE HOLDING CIRCUITS OF SAID RELAY MEANS OPERATE IN FLIP-FLOP MODE, FIRST AND SECOND ELECTRICALLY ENERGIZABLE SIGNAL DEVICES, AND FIRST AND SECOND ENERGIZING CIRCUITS RESPECTIVELY FOR THE FIRST AND SECOND SIGNAL DEVICES RUNNING FROM ONE POWER CONDUCTOR THROUGH NORMALLY OPEN CONTACT AND ARMATURE PAIRS ON THE FIRST AND SECOND RELAY MEANS TO THE OTHER POWER CONDUCTOR.