Fuel feed and charge forming apparatus

Claim 1

IN A FUEL SYSTEM FOR AN INTERNAL COMBUSTION ENGINE, A CARBURETOR BODY HAVING A MIXING PASSAGE AND AN UNVENTED FUEL CHAMBER ARRANGED AT ONE SIDE OF THE MIXING PASSAGE, A THROTTLE VALVE AND A CHOKE VALVE HAVING SHAFTS PASSING THROUGH THE MIXING PASSAGE, A FUEL METERING DIAPHRAGM FORMING ONE WALL OF THE FUEL CHAMBER, A FUEL INLET FOR SAID CHAMBER FORMED IN THE CARBURETOR BODY, AND INLET VALVE FOR SAID FUEL INLET, A LEVER FULCRUMED IN THE FUEL CHAMBER ARRANGED TO TRANSMIT MOVEMENTS OF THE METERING DIAPHRAGM TO THE FUEL INLET VALVE FOR CONTROLLING FUEL FLOW INTO THE FUEL CHAMBER, RESILIENT MEANS BIASING THE INLET VALVE TOWARD CLOSED POSITION, ORIFICE MEANS OPENING INTO THE MIXING PASSAGE, FUEL CHANNEL MEANS IN SAID BODY FOR CONVEYING FUEL FROM SAID FUEL CHAMBER TO SAID ORIFICE MEANS, A PLATE SECURED TO THE BODY AND DISPOSED AT THE OPPOSITE SIDE OF THE MIXING PASSAGE FROM THE METERING DIAPHRAGM, ADJACENT REGIONS OF THE CARBURETOR BODY AND PLATE BEING FORMED WITH RECESSES, A PUMPING DIAPHRAGM BETWEEN THE PLATE AND CARBURETOR BODY AND EXTENDING ACROSS THE RECESSED FORMING THEREWITH A FUEL COMPARTMENT IN THE CARBURETOR BODY AND A PULSE CHAMBER IN THE PLATE, MEANS TO CONNECT THE PULSE CHAMBER WITH A SOURCE OF VARYING FLUID PRESSURE FOR ACTUATING THE PUMPING DIAPHRAGM, SAID THROTTLE VALVE AND SAID CHOKE VALVE SHAFT BEING SUBSTANTIALLY PARALLEL TO EACH OTHER AND ARRANGED AT AN ACUTE ANGLE WITH RESPECT TO A PLANE THROUGH THE MIXING PASSAGE PARALLEL TO THE METERING DAIPHRAGM, AND MANUALLY ADJUSTABLE MEANS FOR METERING FUEL FLOW FROM THE FUEL CHAMBER TO THE ORIFICE MEANS, SAID METERING DIAPHRAGM BEING ACTUATE BY ASPIRATION IN THE MIXING PASSAGE TO REGULATE FUEL FLOW PAST THE INLET VALVE.