Means for regulating the height of fuel mounds within a furnace

Claim 1

A THERMOSTATIC CONTROL FOR AN AUTOMATIC FURNACE FIRING SYSTEM COMPRISING A PROBE ADAPTED FOR INSERTION INTO THE COMBINATION CHAMBER OF A FURNACE AND FOR PENETRATION OF A MOUND OF BURNING FUEL THEREIN ADJACENT A FUEL FEED INLET, MEANS FOR CIRCULATING A FLUID MEDIUM THROUGH SAID PROBE THEREBY COOLING THE LATTER AND HEARING SAID MEDIUM, A THERMOSTATIC ACTUATOR IN HEAT EXCHANGE RELATION WITH THE HEATED MEDIUM, MEANS REGULATED BY SAID THERMOSTATIC ACTUATOR CONTROLLING THE FEEDING OF FUEL INTO SAID FURNACE THROUGH SAID FUEL FEED INLET, SAID PROBE COMPRISING AN ELONGATED TUBE HAVING A SENSING ELEMENT AT ONE END, A PIPE WITHIN SAID TUBE HAVING AN END OPENING INTO SAID SENSING ELEMENT, MEANS SUPPLYING A FLUID MEDIUM INTO THE OTHER END OF SAID PIPE, MEANS FOR DISCHARGING SAID HEATED FLUID MEDIUM FROM SAID TUBE AND CONDUCTING IT TO SAID THERMOSTATIC ACTUATOR, AND SAID SENSING ELEMENT COMPRISING A BULB HAVING A REMOVABLE HEAT FUSIBLE CLOSURE ELEMENT IN ITS LOWER END.