Oil burner control systems

Claim 1

A SAFETY OIL BURNER CONTROL FOR CONTROLLING THE OPERATION OF AN OIL BURNER SYSTEM AND FOR DE-ENERGIZING THE BURNER IN THE EVENT OF MALFUNCTION OF THE SYSTEM, SAID CONTROL COMPRISING AT LEAST THREE TERMINALS, ONE OF THESE TERMINALS BEING DESIGNATED THE BURNER TERMIANL AND BEING ADAPTED TO BE CONNECTED TO THE OIL BURNER, ANOTHER OF THESE TERMINALS BEING DESIGNATED THE THERMOSTAT TERMINAL AND BEING ADAPTED TO BE CONNECTED THROUGH A THERMOSTAT TO ONE SIDE OF A SOURCE OF ELECTRICAL POWER, ANOTHER OF THESE TERMINALS BEING DESIGNATED A GROUDN TERMINAL AND BEING ADAPTED TO BE CONNECTED TO THE OPPOSITE SIDE OF THE ELECTRICAL SOURCE FROM THE THERMOSTAT TERMINAL; AN ELECTRICAL RELAY HAVING NORMALLY OPEN CONTACTS AND A COIL FOR CLOSING SAID CONTACTS IN RESPONSE TO A FLOW OF ELECTRICAL CURRENT THROUGH SAID COIL, SAID RELAY CONTACTS BEING IN CIRCUIT BETWEEN SAID THERMOSTAT TERMINAL AND SAID BURNER TERMINAL FOR INTERRUPTING THE SUPPLY OF ELECTRICAL POWER TO SAID BURNER TERMINAL WHEN SAID RELAY CONTACTS ARE OPEN; A TIME-DELAY THERMALLY-ACTUATED SWITCH HAVING NORMALLY OPEN AND NORMALLY CLOSED CONTACTS AND A RESISTANCE HEATING ELEMENT FOR CLOSING THE NORMALLY OPEN CONTACTS AND FOR OPENING THE NORMALLY CLOSED CONTACTS AFTER AN APPROPRIATE TIME DELAY, SAID HEATING ELEMENT, SAID NORMALL-CLOSED CONTACTS OF THE TIME-DELAY SWITCH AND SAID RELAY COIL BEING IN A FIRST CIRCUIT IN SERIES RELATIONSHIP BETWEEN SAID THERMOSTAT TERMINAL AND SAID GROUND TERMINAL; COMBUSTION ENERGY RESPONSIVE MEANS BEING EFFECTIVELY SHUNTED ACROSS SAID HEATING ELEMENT FOR BY-PASSING ELECTRICAL CURRENT AROUND SAID HEATING ELEMENT WHEN SAID COMBUSTION-ENERGY RESPONSIVE MEANS IS ACTUATED BY ENERGY RESULTING FROM COMBUSTION; AND A WARNING DEVICE, SAID HEATING ELEMENT, SAID NORMALLY-OPEN CONTACTS OF THE TIME-DELAY SWITCH AND SAID WARNING DEVICE BEING IN A SECOND CIRCUIT IN SERIES RELATIONSHIP BETWEEN SAID THERMOSTAT TERMINAL AND SAID GROUND TERMINAL, SAID SECOND CIRCUIT CONDUCTING ELECTRICAL CURRENT ACTUATING SAID WARNING DEVICE AND KEEPING SAID HEATING ELEMENT HEATED FOR MAINTAINING SAID NORMALLY-OPEN CONTACTS IN THEIR CLOSED POSITION AFTER SAID NORMALLY-OPEN CONTACTS HAVE CLOSED.