Charge forming apparatus

Claim 1

IN COMBINATION, CHARGE FORMING APPARATUS INCLUDING A BODY FORMED WITH A MIXING PASSAGE, AN UNVENTED FUEL CHAMBER FORMED IN THE BODY, A FLEXIBLE DIAPHRAGM FORMING A WALL OF THE FUEL CHAMBER, A FUEL INLET FOR THE FUEL CHAMBER, A VALVE MEMBER FOR THE FUEL INLET, MEANS INCLUDING A LEVER ESTABLISHING OPERATIVE CONNECTION BETWEEN THE VALVE MEMBER AND THE DIAPHRAGM FOR CONTROLLING THE POSITION OF THE VALVE MEMBER FOR REGULATING FUEL FLOW FROM A SUPPLY INTO THE FUEL CHAMBER, SAID BODY BEING FORMED WITH A BORE OPENING INTO THE MIXING PASSAGE, A FITTING HAVING A SMOOTH CYLINDRICAL EXTERIOR SURFACE PRESSED INTO SAID BORE, AN END REGION OF THE FITTING EXTENDING INTO THE MIXING PASSAGE, SAID FITTING HAVING A FUEL PASSAGE FORMED THEREIN OPENING INTO THE MIXING PASSAGE, A SECONDARY FUEL DELIVERY ORIFICE FORMED IN SAID BODY OPENING INTO THE MIXING PASSAGE, DUCT MEANS FORMED IN THE BODY FOR CONVEYING FUEL FROM THE FUEL CHAMBER TO THE SECONDARY ORIFICE, AND MEANS IN SAID FITTING TO PREVENT AIR BLEEDING THROUGH THE PASSAGE IN THE FITTING INTO THE DUCT MEANS WHEN THE SECONDARY ORIFICE IS DELIVERING FUEL INTO THE MIXING PASSAGE.