Carburetor

Claim 1

A CARBURETOR FOR AN INTERNAL COMBUSTION ENGINE, SAID CARBURETOR COMPRISING A FUEL RESERVOIR, A BODY FORMED WITH AN AIR AND FUEL MIXTURE CONDUIT ADAPTED TO BE CONNECTED TO THE INTAKE MANIFOLD OF SAID ENGINE, SAID BODY INCLUDING A FUEL PASSAGE EXTENDING BETWEEN SAID FUEL RESERVOIR AND SAID MIXTURE CONDUIT, A THROTTLE MOVABLY MOUNTED WITHIN SAID MIXTURE CONDUIT, SAID FUEL PASSAGE INCLUDING A PORTION HAVING A PREDETERMINED RESTRICTION, A METERING ROD HAVING ONE END THEREOF SHAPED WITH A VARYING THICKNESS AND POSITIONED WITHIN AND FOR MOVEMENT THROUGH SAID PASSAGE RESTRICTION, A METERING ROD RETAINER FITTED TO THE OTHER END OF SAID METERING ROD, SAID BODY FORMED WITH A CAVITY AND AN ANNULAR CONICAL SHOULDER WITHIN SAID CAVITY A GENERALLY CONE-SHAPED DIAPHRAGM MOUNTED ACROSS SAID CAVITY WITH THE PERIPHERY OF SAID DIAPHRAGM FITTED TO SAID SHOULDER AND THE CENTRAL PORTION OF THE DIAPHRAGM EXTENDING TOWARD SAID RESTRICTION, A SHEET METAL THIMBLE-SHAPED RETAINER MOUNTED WITHIN SAID CAVITY, SAID RETAINER HAVING A RIM PORTION THEREOF PRESSING THE PERIPHERY OF SAID DIAPHRAGM AGAINST SAID SHOULDER, SAID METERING ROD RETAINER FIXED TO THE CENTER OF SAID DIAPHRAGM, A SPRING BETWEEN THE BOTTOM OF SAID THIMBLE-SHAPED RETAINER AND ONE SIDE OF SAID DIAPHRAGM TO SAID BIAS SAID DIAPHRAGM IN ONE DIRECTION, SAID BODY FORMED WITH A PASSAGE EXTENDING FROM SAID CAVITY ON SAID ONE SIDE OF SAID DIAPHRAGM TO SAID MIXTURE CONDUIT DOWNSTREAM OF SAID THROTTLE TO CONNECT SAID CAVITY TO LOW AIR PRESSURE WITHIN SAID ENGINE INTAKE MANIFOLD WHEREBY SAID DIAPHRAGM MAY BE MOVED AGAINST THE BIAS OF SAID SPRING, AND A SHEET METAL CUP PRESSED INTO SAID CAVITY AGAINST THE BOTTOM OF SAID THIMBLE-SHAPED RETAINER AND FORCING THE RIM OF SAID THIMBLE-SHAPED RETAINER ONTO THE PERIPHERY OF SAID DIAPHRAGM TO FORM A FUEL-TIGHT SEAL OF SAID DIAPHRAGM ON SAID SHOULDER.