Warm-up enrichment system

Claim 1

IN A CARBURETOR FOR AN INTERNAL COMBUSTION ENGINE, SAID CARBURETOR COMPRISING A MAIN BODY HAVING AN AIR PASSAGE WITH A VENTURI THEREIN, A THROTTLE PLATE POSITIONED DOWNSTREAM OF SAID VENTURI, AND FUEL RESERVOIR MEANS ADJACENT TO SAID BOFY, A WARM-UP ENRICHMENT SYSTEM COMPRISING A HOUSING HAVING A PLURALITY OF CHAMBERS FORMED THEREIN; VALVE MEANS LOCATED IN THE FIRST OF SAID CHAMBERS; A FIRST PASSAGEWAY COMMUNICATING BETWEEN SAID FIRST CHAMBER AND A POINT DOWNSTREAM OF SAID THROTTLE PLATE; MEANS TO CAUSE SAID VALVE MEANS TO BE RESPONDIVE TO A LOW ENGINE MANIFOLD VACUUM WHILE THE ENGINE IS BEING STARTED TO ALLOW FUEL TO FLOW INTO SAID FIRST PASSAGEWAY; A LEVER OPERABLY CONNECTED BETWEEN SAID THROTTLE PLATE AND SAID ALVE MEANS FOR CONTROLLING THE OPENING OF SAID VALVE MEANS DURING WARM-UP WHEN SAID THROTTLE PLATE IS IN A WIDE OPEN POSITION; METERING ROD MEANS SLIDABLY POSITIONED IN A SECOND OF SAID CHAMBERS; A FUEL WELL FORMED IN A THIRD OF SAID CHAMBERS; A SECOND PASSAGEWAY COMMUNICATING BETWEEN SAID FUEL WELL AND SAID SECOND CHAMBER; A THIRD PASSAGEWAY COMMUNICATING BETWEEN SAID SECOND CHAMBER AND SAID VENTURI; A FOURTH PASSAGEWAY COMMUNICATING BETWEEN SAID THIRD PASSAGEWAY AND A POINT DOWNSTREAM OF SAID THROTTLE PLATE; A FIFTH PASSAGEWAY COMMUNICATING BETWEEN SAID THIRD CHAMBER AND SAID FIRST CHAMBER; A SIXTH PASSAGEWAY COMMUNICATING BETWEEN SAID SECOND CHAMBER AND SAID FIFTH PASSAGEWAY; A BIMETALLIC THERMOSTATIC SPRING ROTATABLY LOCATED IN A FOURTH OF SAID CHAMBES, SAID SPRING BEING RESPONSIVE TO ENGINE MANIFOLD TEMPERATURE; LINKAGE MEANS CONNECTED BETWEEN SAID SPRING AND SAID METERING ROD MEANS, SUCH THAT SAID METERING ROD MEANS IS SLIDABLY MOVED IN SAID SECOND CHAMBER IN RESPONSE TO MOVEMENT OF SAID BIMETALLIC THERMOSTATIC SPRING; AND FIRST AND SECOND FRESH AIR BLEEDS FORMED IN SAID SECOND CHAMBER; SAID METERING ROD MEANS BEING FORMED SUCH THAT, ONE SAID METERING ROD MEANS BEING MOVED BY SAID LINKAGE MEANS TO A POSITION WHEREIN IT BLOCKS OFF SAID SECOND PASSAGEWAY, SAID FIRST FRESH AIR BLEED WILL BE IN COMMUNICATION WITH SAID THIRD PASSAGEWAY, THEREBY PREVENTING ANY LEAKAGE OF FUEL FROM SAID SECOND PASSAGEWAY INTO SAID SECOND CHAMBER, AND SAID SECOND FRESH AIR BLEED WILL BE IN COMMUNICATION WITH SAID FIRST CHAMBER VIA SAID SIXTH AND FIFTH PASSAGEWAYS, THEREBY PREVENTING ANY FURTHER FUEL FLOW FROM SAID FUEL WELL INTO SAID FIRST CHAMBER.