Charge forming device enrichment mechanism

Claim 1

A CHARGE FORMING DEVICE ADAPTED TO SUPPLY A COMBUSTIBLE MIXTURE TO THE INTAKE MANIFOLD OF AN INTERNAL COMBUSTION ENGINE COMPRISING A MAIN INDUCTION PASSAGE HAVING A THROTTLE VALVE FOR CONTROLLING THE FLOW THERETHROUGH, A FUEL SOURCE, MEANS FOR DISCHARGING FUEL FROM SAID FUEL SOURCE INTO SAID MAIN INDUCTION PASSAGE, AN AUXILIARY INDUCTION PASSAGE IN COMMUNICATION WITH THE INTAKE MANIFOLD, A VALVE MEMBER JOURNALED IN SAID CHARGE FORMING DEVICE FOR ROTARY AND AXIAL MOVEMENT, SAID VALVE MEMBER HAVING A FIRST PORTION DISPOSED IN SAID AUXILIARY INDUCTION PASSAGE FOR CONTROLLING THE FLOW THERETHROUGH, THERMALLY RESPONSIVE MEANS FOR ROTATABLY POSITIONING SAID FIRST PORTION TO CONTROL THE FLOW THROUGH SAID AUXILIARY INDUCTION PASSAGE, A SUPPLEMENTARY FUEL DISCHARGE MEANS IN COMMUNICATION WITH SAID FUEL SOURCE FOR DISCHARGING SUPPLEMENTARY FUEL INTO ONE OF SAID INDUCTION PASSAGES, PRESSURE RESPONSIVE MEANS IN COMMUNICATION WITH THE INTAKE MANIFOLD FOR AXIALLY POSITIONING SAID VALVE MEMBER IN RESPONSE TO CHANGES IN INTAKE MANIFOLD VACUUM, AND FUEL VALVE MEANS FOR CONTROLLING THE DISCHARGE OF SUPPLEMENTARY FUEL, SAID FUEL VALVE MEANS BEING POSITIONED BY THE AXIAL POSITION OF SAID VALVE MEMBER.