Constant metering force carburetor

Claim 1

A CARBURETOR FOR AN INTERNAL COMBUSTION ENGINE COMPRISING AN INDUCTION PASSAGE, A THROTTLE VALVE FOR CONTROLLING THE FLOW OF COMBUSTIBLE MIXTURE THROUGH SAID INDUCTION PASSAGE, AIR VALVE MEANS IN SAID INDUCTION PASSAGE ANTERIOR TO SAID THROTTLE VALVE, SAID VALVE MEANS BEING MOVABLE IN RESPONSE TO PRESSURE VARIATIONS IN SAID INDUCTION PASSAGE FOR MAINTAINING A SUBSTANTIALLY CONSTANT PRESSURE BETWEEN SAID AIR VALVE AND SAID THROTTLE VALVE, A FUEL SOURCE A FUEL DISCHARGE CIRCUIT FOR DISCHARGING FUEL FROM SAID FUEL SOURCE INTO THE PORTION OF SAID INDUCTION PASSAGE BETWEEN SAID AIR VALVE AND SAID THROTTLE VALVE, A FUEL METERING VALVE FOR CONTROLLING A RATE OF FUEL FLOW THROUGH SAID FUEL DISCHARGE CIRCUIT, A METERING CAM OPERATIVELY CONNECTED FOR MOVEMENT WITH SAID AIR VALVE, A PIVOTED LEVER HAVING A PORTION THEREOF IN ENGAGEMENT WITH SAID METERING CAM, MEANS OPERATIVELY CONNECTED SAID FUEL METERING VALVE WITH SAID PIVOTED LEVER FOR MOVEMENT OF SAID FUEL METERING VALVE UPON PIVOTAL MOVEMENT OF SAID LEVER, AND MEANS RESPONSIVE TO AN ENGINE OPERATING CONDITION FOR VARYING THE LOCATION OF THE PIVOT AXIS OF SAID PIVOTED LEVER IN RESPONSE TO VARIATIONS IN THE ENGINE OPERATING CONDITION, SAID LASTNAMED MEANS INCLUDING AN ECCENTRICALLY MOUNTED SHAFT PIVOTALLY ENGAGING SAID PIVOTED LEVER.