Charge forming apparatus

Claim 1

IN COMBINATION, CHARGE FORMING APPARATUS INCLUDING A BODY FORMED WITH A MIXING PASSAGE, A FUEL CHAMBER FORMED IN THE BODY, A THROTTLE VALVE IN THE MIXING PASSAGE, FLEXIBLE DIAPHRAGM HAVING ONE SIDE FORMING A WALL OF THE FUEL CHAMBER AND ITS OTHER SIDE HAVING AN UNSUPPORTED CENTER PORTION, SAID MIXING PASSAGE BEING FORMED WITH A MAIN VENTURI, A SUPPLEMENT VENTURI OF REDUCED SIZE IN THE MAIN VENTURI AND HAVING ITS AXIS PARALLEL TO AND OFFSET FROM THE AXIS OF THE MAIN VENTURI TOWARD THE DIAPHRAGM, AN ORIFICE OPENING INTO THE SUPPLEMENTAL VENTURI, A FUEL INLET IN SAID BODY, A VALVE FOR SAID FUEL INLET, A LEVER FULCRUMED IN THE FUEL CHAMBER ENGAGEABLE WITH THE INLET VALVE, SAID LEVER BEING ENGAGED WITH AND ACTUATED BY THE DIAPHRAGM FOR TRANSMITTING MOVEMENT OF THE DIAPHRAGM THROUGH THE LEVER TO POSITION THE INLET VALVE FOR CONTROLLING FUEL FLOW INTO THE FUEL CHAMBER, A PORTION OF SAID LEVER EXTENDING SUBSTANTIALLY PARALLEL TO SAID DIAPHRAGM, PIVOT MEANS FOR SAID LEVER, SAID PIVOT MEANS BEING OFFSET FROM THE CENTRAL AXIS OF SAID DIAPHRAGM MEANS BIASING THE INLET VALVE TOWARD CLOSED POSITION, SAID FUEL CHAMBER BEING UNVENTED WHEREBY THE DIAPHRAGM IS ACTUATED SOLELY BY DIFFERENTIAL PRESSURE IN THE MIXING PASSAGE, AND PASSAGE MEANS FOR CONVEYING FUEL FROM THE FUEL CHAMBER TO THE ORIFICE.