Apparatus for controlling furnace temperatures

Claim 1

THE COMBINATION WITH A FURNACE OR THE LIKE HAVING MEANS FOR SUPPLYING IT WITH A BLAST OF IGNITED MIXTURE OF OIL AND COMBUSTION AIR FROM AN OIL BURNER WHICH MEANS INCLUDES A BLOWER FOR SUCH AIR AND A PUMP FOR SUCH OIL AND AN ELECTRIC MOTOR FOR DRIVING SAID BLOWER AND PUMP, OF MEANS FOR CONTROLLING THE TEMPERATURE OF THE INTERIOR OF SAID FURNACE COMPRISING WALLS FORMING A CHAMBER AT THE EXTERIOR OF THE FURNACE IN FLUID COMMUNICATION WITH ITS INTERIOR, A THERMOSTATIC SWITCH HAVING ITS HEAT SENSITIVE ELEMENT POSITIONED WITHIN SAID CHAMBER, SAID PUMP HAVING AN OIL SUPPLY PIPE AND AN OIL DISCHARGE PIPE FOR THE OIL SUPPLIED SAID BLAST, A NORMALLY OPEN SOLENOID VALVE IN ONE OF SAID PIPES, SAID BLOWER HAVING AN AIR INLET SIDE AND AN AIR DISCHARGE SIDE FOR THE AIR SUPPLIED SAID BLAST, A PIPE CONNECTION LEADING FROM THE AIR DISCHARGE SIDE OF SAID BLOWER TO SAID CHAMBER, A NORMALLY CLOSED SOLENOID VALVE IN SAID PIPE CONNECTION; AND CIRCUIT MEANS CONTROLLED BY SAID SWITCH, WHEN SAID MOTOR IS OPERATING TO DRIVE SAID BLOWER AND PUMP, FOR OPERATING SAID SOLENOID VALVES TO CLOSE THE FIRST MENTIONED OF THEM AND OPEN THE SECOND MENTIONED OF THEM WHEN SAID SWITCH OPERATES IN RESPONSE TO A RISE IN SUCH TEMPERATURE TO ABOVE A PREDETERMINED VALUE AND TO OPEN SAID FIRST MENTIONED VALVE AND CLOSE SAID SECOND MENTIONED VALVE WHEN SAID SWITCH OPERATES IN RESPONSE TO A FALL IN SUCH TEMPERATURE TO BELOW THAT VALUE.