Carburetor

Claim 1

A MULTISTAGE CARBURETOR FOR AN INTERNAL COMBUSTION ENGINE COMPRISING A BODY STRUCTURE HAVING A PRIMARY MICING CONDUIT AND A SECONDARY MIXTURE CONDUIT FOR THE FLOW OF AN AIR AND FUEL MIXTURE THERETHROUGH TO SAID ENGINE, MEANS INCLUDING A PRIMARY NOZZLE FOR PROVING FUEL FLOW INTO SAID PRIMARY CONDUIT AND A SECONDARY NOZZLE FOR PROVIDING FUEL FLOW INTO SAID SECONDARY CONDUIT, MANUALLY OPERABLE MEANS INCLUDING A PRIMARY THROTTLE AND A SECONDARY THROTTLE MOVABLY MOUNTED RESPECTIVELY WITHIN SAID PRIMARY AND SECONDARY CONDUITS AND DOWNSTREAM RESPECTIVELY OF SAID NOZZLES FOR CONTROLLING THE FLOW OF AIR-FUEL MIXTURE THERETHROUGH, A CONTROL VALVE WITHIN SAID SECONDARY CONDUIT UPSTREAM OF SAID SECONDARY NOZLE THEREIN, MEANS MOUNTING SAID CONTROL VALVE FOR MOVEMENT FROM A POSITION CLOSING SAID SECONDARY CONDUIT TOWARD AN OPEN POSITION BY AIR FLOW THROUGH SAID SECONDARY CONDUIT, MEANS CONNECTED TO SAID CONTROL VALVE NORMALLY BIASING SAID CONTROL VALVE AGAINST SAID AIR FLOW TOWARD SAID CLOSED POSITION, AND TEMPERATURE RESPONSIVE MEANS CONNECTED TO SAID CONTROL VALVE BIASING MEANS TO MODIFY SAID CONTROL VALVE BIASING MEANS IN RESPONSE TO ENGINE TEMPERATURE.