Carburetor

Claim 1

A CARBURETOR FOR AN INTERNAL COMBINATION ENGINE, SAID CARBURETOR COMPRISING A BODY STRUCTURE HAVING AN AIR AND FUEL MIXTURE CONDUIT THERETHROUGH, A THROTTLE VALVE MOUNTED ACROSS SAID MIXTURE CONDUIT FOR MOVEMENT FROM AN OPEN TO A POSITION CLOSING SAID MIXTURE CONDUIT, MEANS FOR OPERATING SAID THROTTLE VALVE, AN AIR VALVE MOUNTED WITHIN SAID MIXTURE CONDUIT ANTERIORLY OF SAID THROTTLE VALVE FOR MOVEMENT FROM AN OPEN TO A POSITION CLOSING SAID MIXTURE CONDUIT, SAID BODY STRUCTURE HAVING A FUEL CHAMBER THEREIN AND A FUEL PASSAGE EXTENDING FROM SAID FUEL CHAMBER TO SAID MIXTURE CONDUIT FOR SUPPLYING FUEL THERETO, SAID PASSAGE HAVING A METERING RESTRICTION, A METERING ROD OPERATIVELY CONNECTED TO SAID AIR VALVE, SAID METERING ROD HAVING A PORTION OF VARYING THICKNESS WITHIN SAID METERING RESTRICTION TO VARY FUEL FLOW THROUGH SAID FUEL PASSAGE, A SERVO MOTOR RESPONSIVE TO AMBIENT AIR PRESSURE CONNECTED TO SAID AIR VALVE TO CONTROL SAID AIR VALVE, MEANS FORMING A FIRST AIR PASSAGE TO SAID SERVO MOTOR FROM SAID MIXTURE CONDUIT DOWNSTEAM OF SAID AIR VALVE TO EXPOSE SAID SERVO MOTOR TO CHANGES IN AIR PRESSURE IN SAID MIXTURE CONDUIT IN RESPONSE TO OPERATION OF SAID THROTTLE, MEANS FORMING A SECOND AIR PASSAGE FROM AMBIENT AIR TO SAID FIRST AIR PASSAGE, AND TEMPERATURE RESPONSIVE VALVE MEANS IN SAID SECOND AIR PASSAGE FOR CONTROLLING THE FLOW OF AIR THROUGH SAID SECOND PASSAGE WHEREBY TO MODIFY THE OPERATION OF SAID SERVO MOTOR IN RESPONSE TO ENGINE TEMPERATURES.