Air valve carburetor

Claim 1

A CHARGE FORMING DEVICE FOR AN INTERNAL COMBUSTION ENGINE COMPRISING AN INDUCTION PASSAGE, A THROTTLE VALVE ROTATABLY MOUNTED IN SAID INDUCTION PASSAGE, AN AIR VALVE ROTATABLY MOUNTED IN SAID INDUCTION PASSAGE ANTERIORLY OF SAID THROTTLE VALVE, A PRESSURE RESPONSIVE DEVICE HAVING CONDUIT MEANS CONNECTING IT TO SAID INDUCTION PASSAGE ON ONE SIDE OF SAID AIR VALVE AND CONDUIT MEANS CONNECTING IT TO SAID INDUCTION PASSAGE ON THE OTHER SIDE OF SAID AIR VALVE AND OPERATIVELY CONNECTED TO AND ADAPTED TO CONTROL THE POSITION OF SAID AIR VALVE IN ACCORDANCE WITH THE PRESSURE DROP ACROSS THE AIR VALVE, A SOURCE OF FUEL, CONDUIT MEANS COMMUNICATING SAID FUEL SOURCE WITH THE INDUCTION PASSAGE INTERMEDIATE SAID AIR AND THROTTLE VALVES, A METERING ORIFICE IN SAID CONDUIT MEANS, A METERING ROD ADAPTED TO COACT WITH SAID ORIFICE TO CONTROL THE QUANTITY OF FUEL FLOW THERETHROUGH, SAID METERING ROD BEING ADJUSTABLY CONNECTED TO SAID AIR VALVE WHEREBY FUEL FLOW THROUGH THE ORIFICE IS PROPORTIONAL TO THE DEGREE OF OPENING OF SAID AIR VALVE, A CHOKE VALVE DISPOSED IN SAID INDUCTION PASSAGE ANTERIORLY OF SAID AIR VALVE, VALVE MEANS RESPONSIVE TO CLOSURE OF SAID CHOKE VALVE TO INCREASE THE DIFFERENTIAL OF THE PRESSURES ON OPPOSITE SIDES OF SAID AIR VALVE CAUSING SAID PRESSURE RESPONSIVE DEVICE TO INCREASE THE FUEL FLOW THROUGH SAID METERING ORIFICE, SAID VALVE MEANS ALSO BEING RESPONSIVE TO OPENING OF SAID CHOKE TO ELIMINATE SAID INCREASE WHEREBY AFTER THE ENGINE HAS STARTED FUEL METERING WILL BE UNAFFECTED BY SAID VALVE MEANS AND CONTROLLED IN A NORMAL MANNER IN ACCORDANCE WITH THE POSITION OF THE AIR VALVE.