Regulating valve system

Claim 1

IN AN INTERNAL COMBUSTION ENGINE OF AN AUTOMOTIVE VEHICLE HAVING A CARBURETOR AND AN INTAKE MANIFOLD, A REGULATOR SYSTEM FOR AUTOMATICALLY CONTROLLING THE FLOW OF FUEL-AIR MIXTURE FROM THE CARBURETOR TO THE MANIFOLD, SAID REGULATOR SYSTEM COMPRISING A REGULATING VALVE CONNECTED BETWEEN THE OUTLET OF THE CARBURETOR AND THE INLET OF THE MANIFOLD, SAID VALVE ADAPTED TO BE MOVED BETWEEN AN OPEN POSITION AND A CLOSED POSITION TO CONTROL THE FLOW OF THE FUEL-AIR MIXTURE FROM THE CARBURETOR TO THE MANIFOLD, AND MEANS EXPOSED TO THE VACUUM IN THE MANIFOLD FOR OPERATING SAID VALVE BETWEEN ITS POSITIONS UPON A CHANGE IN THE MANIFOLD VACUUM, SAID OPERATING MEANS COMPRISING A PISTON SLIDABLY MOUNTED IN A CYLINDER AND CONNECTED TO THE VALVE, MEANS CONNECTING ONE PORTION OF THE CYLINDER TO THE MANIFOLD TO BE MAINTAINED AT THE MANIFOLD VACUUM, AND MEANS FOR APPLYING A FORCE ON SAID PISTON IN A DIRECTION OPPOSITE TO THE FORCE APPLIED ON THE PISTON BY THE MANIFOLD VACUUM, SAID MEANS FOR APPLYING THE OPPOSING FORCE ON THE PISTON INCLUDING A SOURCE OF REFERENCE VACUUM APPLIED TO THE OTHER SIDE OF THE PISTON, AND MEANS FOR MAINTAINING SAID VACUUM SOURCE AT A DESIRED PRE-SET VACUUM, SAID OPERATING MEANS INCLUDING MEANS PROVIDING A LEAKAGE PATH FROM ONE SIDE OF THE PISTON TO THE OTHER SIDE THEREOF, AND SAID VACUUM SOURCE COMPRISING A CHAMBER CONNECTED TO THE PORTION OF THE CYLINDER ON THE OTHER SIDE OF THE PISTON SO THAT THE LEAKAGE PATH ADMITS MANIFOLD VACUUM TO SAID CHAMBER TO DEVELOP SAID REFERENCE VACUUM, AND A CHECK VALVE CONNECTING SAID CHAMBER TO THE ATMOSPHERE, SAID CHECK VALVE PERMITTING FLOW OF AIR INTO SAID CHAMBER WHEN THE VACUUM IN SAID CHAMBER INCREASES BEYOND THE DESIRED PRE-SET VACUUM.