Fully automatic flame protection device

Claim 1

IN AN AUTOMATIC PROTECTION DEVICE ADAPTED TO BE CONNECTED TO ELECTRIC MAINS AND FOR A PLURALITY OF MAIN GAS BURNERS EACH HAVING A PILOT GAS BURNER WITH ELECTRICALLY OPERATED IGNITION MEANS, ELECTRICALLY OPERATED MAIN GAS VALVE MEANS TO CONTROL THE FLOW OF GAS TO THE MAIN BURNERS, ELECTRICALLY OPERATED PILOT GAS VALVE MEANS TO CONTROL THE FLOW OF GAS TO THE PILOT BURNERS, AND BURNER OPERATION SENSING MEANS ASSOCIATED WITH EACH PILOT BURNER, THE IMPROVEMENT COMPRISING: A THERMOELECTRIC RELAY FOR EACH PILOT BURNER, EACH RELAY INCLUDING AN ACTUATING COIL, A NORMALLY OPENED CONTACT AND A NORMALLY CLOSED CONTACT, EACH COIL BEING CONNECTED TO THE RESPECTIVE SENSING MEANS TO BE ENERGIZED UPON THE RESPECTIVE SENSING MEANS BEING HEATED BY THE RESPECTIVE PILOT BURNER; MONITOR RELAY MEANS INCLUDING AN ACTUATING COIL AND NORMALLY OPENED CONTACT MEANS; AND CIRCUIT MEANS INCLUDING SWITCH MEANS CONNECTED TO SAID MONITOR RELAY MEANS AND ADAPTED TO BE CONNECTED TO THE MAINS TO ENERGIZE THE MONITOR RELAY COIL WHEN THE SWITCH MEANS IS CLOSED, SAID NORMALLY CLOSED CONTACTS OF EACH THERMOELECTRIC RELAY BEING CONNECTED IN PARALLEL WITH EACH OTHER IN SERIES WITH SAID IGNITION MEANS AND WITH SAID NORMALLY OPENED CONTACT MEANS OF SAID MONITOR RELAY MEANS TO ENERGIZE SAID IGNITION MEANS WHEN SAID MONITOR RELAY MEANS IS ENERGIZED AND WHEN ANY ONE OF THE NORMALLY CLOSED CONTACTS IS CLOSED, SAID NORMALLY OPENED CONTACTS OF THE THERMOELECTRIC RELAYS BEING CONNECTED IN SERIES WITH EACH OTHER AND IN SERIES WITH SAID MAIN VALVE MEANS AND WITH SAID NORMALLY OPENED CONTACT MEANS OF SAID MONITOR RELAY MEANS TO OPEN SAID MAIN VALVE MEANS ONLY WHEN SAID MONITOR RELAY MEANS AND ALL OF SAID THERMOELECTRIC RELAYS ARE ENERGIZED; SAID PILOT VALVE MEANS BEING CONNECTED TO SAID NORMALLY OPENED CONTACT MEANS OF THE MONITOR RELAY MEANS TO BE ENERGIZED WHEN THE MONITOR RELAY MEANS IS ENERGIZED.