Oven control system

Claim 1

IN AN OVEN CONTROL SYSTEM UTILIZING HYDRAULIC FLUID CONTROLS TO OPERATE AT A CONTROL TEMPERATURE ABOVE THE BREAKDOWN TEMPERATURE OF THE FLUID EMPLOYED FOR AN OVEN HAVING A CHAMBER COMPOSED OF WALLS, A HEATING UNIT DISPOSED WITHIN SAID CHAMBER AND AN OVEN DOOR, AND A POWER SUPPLY, A HYDRAULIC DIAPHRAGM BULB FOR CONTROLLING THE TEMPERATURE OF SAID CHAMBER BY CONTROLLING THE POWER INPUT FROM SAID POWER SUPPLY TO SAID HEATING UNIT, SAID DIAPHRAGM BULB BEING LOCATED OUTSIDE SAID CHAMBER AND FIXEDLY SECURED IN IMMOVABLE CONTACT WITH ONE WALL OF SAID CHAMBER, AND SAID BULB BEING FILLED WITH EXPANSIBLE FLUID HAVING A BREAK-DOWN TEMPERATURE BELOW THE UPPER LIMIT OF THE OPERATING TEMPERATURE RANGE OF THE OVEN TO SENSE BY CONTACT CONDUCTION THE HEAT OUTPUT OF SAID HEATING UNIT, A MICROSWITCH IN SERIES CONNECTION WITH AND CONTROLLING THE FLOW OF POWER FROM SAID POWER SUPPLY, A SECOND DIAPHRAGM BULB IN SERIES WITH SAID FIRST BULB AND SIMILARLY FILLED WITH SAID EXPANSIBLE FLUID, AND POSITIONED AT A DISTANCE AWAY FROM SAID CHAMBER WALLS AND INSULATED THEREFROM, A BULB HEATING ELEMENT IN INTIMATE CONTACT WITH THE SECOND DIAPHRAGM BULB, SAID HEATING ELEMENT BEING ACTUATED BY POWER FROM SAID POWER SUPPLY AND CONTROLLED BY SAID MICROSWITCH, AN EXPANSIBLE DIAPHRAGM IN SERIES WITH BOTH OF SAID HYDRAULIC BULBS AND EXPANSIBLE TO ACTUATE SAID MICROSWITCH.