Carburetters for internal combustion engines

Claim 1

IN A CARBURETTER COMPRISING A BODY HOUSING A FUEL METERING JET, A MAIN AIR INLET PASSAGE, AND A MIXTURE SUPPLY DUCT, A PISTON MOVABLE IN SAID MAIN AIR INLET PASSAGE, AND A METERING NEEDLE AXIALLY MOVABLE IN SAID FUEL METERING JET, THE IMPROVEMENT ACCORDING TO WHICH SAID PISTON DEFINES WITH A WALL OF SAID MAIN AIR INLET PASSAGE A CHOKE CONNECTING SAID MAIN AIR INLET PASSAGE TO SAID MIXTURE SUPPLY DUCT AND COMMUNICATING WITH SAID FUEL METERING JET TO SUCK FUEL THERETHROUGH INTO SAID CHOKE, THE EFFECTIVE CROSS-SECTIONAL AREA OF SAID CHOKE, DEPENDENT UPON THE POSITION OF SAID PISTON, AND SAID METERING NEEDLE BEING MOUNTED ON SAID PISTON FOR MOVEMENT THEREWITH, SAID CARBURETTER FURTHER COMPRISING A VARIABLE LEVERAGE MECHANISM WHICH RESISTS THE FORCE EXERTED ON SAID PISTON BY INCOMING AIR IN SAID AIR INLET PASSAGE, BY APPLYING TO SAID PISTON A LOAD WHICH AUTOMATICALLY DIMINISHES AS SAID PISTON MOVES IN RESPONSE TO THE EXERTION OF INCREASING FFORCE BY SAID INCOMING AIR, AND SAID VARIABLE LEVARAGE MECHANISM COMPRISING A LEVER MOUNTED TO TURN ABOUT THREE PIVOT POINTS SPACED LONGITUDINALLY ALONG SAID LEVER, SPRING MEANS CARRIED ON SAID BODY AND APPLYING A LOAD TO SAID LEVER AT A FIRST ONE OF SAID PIVOT POINTS, AND A RIGID MEMBER ROCKABLY SUPPORTED AT ONE END BY SAID BODY WHILE ITS OTHER END PIVOTALLY ENGAGES SAID LEVER AT A SECOND OF SAID PIVOT POINTS, SAID LEVER BEING POSITIONED WITH SAID THIRD PIVOT POINT OPERATIVELY ENGAGING SAID PISTON TO TRANSFER THERETO THE LOAD APPLIED TO SAID LEVER BY SAID SPRING IN A PROPORTION DEPENDENT UPON THE POSITIONS OF SAID FIRST AND SECOND PIVOT POINTS RELATIVE TO THE POINT AT WHICH SAID SPRING IS CARRIED BY SAID BODY, WHILE SAID PISTONS ACTS ON SAID LEVER TO ADJUST THE POSITIONS OF SAID FIRST AND SECOND PIVOT POINTS.