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 AIR VALVE MEANS BEING MOVABLE IN RESPONSE TO PRESSURE VARIATIONS IN SAID INDUCTION PASSAGE FOR MAINTAINING A SUBSTANTIALLY CONSTANT PRESSURE BETWEEN SAID AIR VALVE MEANS AND THE 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 MEANS AND SAID THROTTLE VALVE, A FUEL METERING VALVE FOR CONTROLLING THE RATE OF FUEL FLOW THROUGH SAID FUEL DISCHARGE CIRCUIT, A METERING CAM, MEANS INTERCONNECTING SAID METERING CAM AND SAID AIR VALVE MEANS FOR SIMULTANEOUS MOVEMENT OF SAID AIR VALVE MEANS AND SAID METERING CAM, A FIRST LEVER, A SECOND LEVER PIVOTALLY SUPPORTING SAID FIRST LEVER FOR PIVOTAL MOVEMENT ABOUT A FIRST PIVOT AXIS, FOLLOWER MEANS UPON SAID FIRST LEVER COACTING WITH A CAM SURFACE OF SAID METERING CAM FOR PIVOTAL MOVEMENT OF SAID FIRST LEVER ABOUT SAID FIRST PIVOT AXIS UPON MOVEMENT OF SAID AIR VALVE MEANS, MEANS INTERCONNECTING SAID FIRST LEVER WITH SAID FUEL METERING VALVE FOR OPERATION OF SAID FUEL METERING VALVE UPON PIVOTAL MOVEMENT OF SAID FIRST LEVE, MEANS SUPPORTING SAID SECOND LEVER FOR PIVOTAL MOVEMENT ABOUT A SECOND PIVOT AXIS, TEMPERATURE RESPONSIVE MEANS OPERATIVELY CONNECTED TO SAID SECOND LEVER FOR PIVOTAL MOVEMENT OF SAID SECOND LEVER ABOUT SAID SECOND PIVOT AXIS UPON VARIATIONS IN TEMPERATURE FOR ALTERING THE LOCATION OF SAID FIRST PIVOT AXIS AND THE RELATIONSHIP BETWEEN SAID FUEL METERING VALVE AND SAID AIR VALVE MEANS, A VACUUM MOTOR, A VACUUM PASSAGE EXTENDING FROM SAID VACUUM MOTOR TO SAID INDUCTION PASSAGE POSTERIOR TO SAID THROTTLE VALVE FOR OPERATING SAID VACUUM MOTOR IN RESPONSE TO VARIATIONS IN ENGINE INTAKE MANIFOLD VACUUM, AND MEANS OPERATIVELY CONNECTING SAID VACUUM MOTOR TO SAID SECOND LEVER FOR MOVING SAID SECOND PIVOT AXIS UPON VARIATIONS IN INTAKE MANIFOLD VACUUM FOR ALTERING THE LOCATION OF SAID FIRST PIVOT AXIS AND THE RELATIONSHIP BETWEEN SAID AIR VALVE MEANS AND SAID FUEL METERING VALVE.