Automatic idle speed-up device

Claim 1

A CHARGE FORMING DEVICE FOR AN INTERNAL COMBUSTION ENGINE COMPRISING AN INDUCTION PASSAGE, A THROTTLE VALVE FOR CONTROLLING THE FLOW THROUGH SAID INDUCTION PASSAGE, AN IDLE DISCHARGE CIRCUIT FOR DISCHARGING FUEL INTO SAID INDUCTION PASSAGE AT A POINT CONTIGUOUS TO THE IDLE POSITION OF SAID THROTTLE VALVE, AN IDLE SPEED-UP DISCHARGE CIRCUIT COMMUNICATING WITH SAID IDLE DISCHARGE CIRCUIT FOR DISCHARGING ADDITIONAL FUEL INTO SAID INDUCTION PASSAGE AT A POINT POSTERIOR TO SAID THROTTLE VALVE, AN AIR PASSAGE COMMUNICATING WITH SAID IDLE SPEED-UP DISCHARGE CIRCUIT FOR BLEEDING AIR INTO SAID CIRCUIT FOR MIXTURE WITH THE FUEL DISCHARGED INTO SAID INDUCTION PASSAGE, AND PRESSURE RESPONSIVE VALVE MEANS FOR CONTROLLING THE AIR AND FUEL FLOWING INTO SAID INDUCTION PASSAGE THROUGH SAID IDLE SPEED-UP DISCHARGE CIRCUIT, SAID PRESSURE RESPONSVE VALVE MEANS BEING RESPONSIVE TO THE PRESSURE IN SAID INDUCTION PASSAGE POSTERIOR TO SAID THROTTLE VALVE AND BEING ADAPTED TO OPEN WHEN THE INDUCTION SYSTEM VACUUM FAILS TO EXCEED NORMAL IDLE VACUUM, SAID PRESSURE RESPONSIVE VALVE MEANS COMPRISING A FIRST VALVE MEMBER FOR CONTROLLING FUEL FLOW AND A SECOND VALVE MEMBER FOR CONTROLLING AIR FLOW.