Choke valve control

Claim 1

IN A FUEL SYSTEM FOR SUPPLYING A MIXTURE OF AIR AND FUEL TO AN INTERNAL COMBUSTION ENGINE, MEANS FOR VARYING THE AIR-FUEL RATION OF TH EMIXTURE COMPRISING A CHOKE CONTROLLING AIR FLOW TO THE ENGINE, A SUPPORT HOUSING, A SHAFT MEMBER ROTATABLY MOUNTED IN SAID HOUSING, A COILED BIMETALLIC THERMOSTAT HAVING ONE END THEREOF SECURED TO SAID SHAFT MEMBER AND THE OTHER END THEREOF OPERATICELY CONNECTED TO SAID CHOKE, A PIN SECURED IN SAID HOUSING AND EXTENDING PARALLEL AND TO ADJACENT SAID SHAFT MEMBER, A CUMULATIVE FORCE SPRING HAVING ONE END SECURED TO SAID SHAFT MEMBER AND POSITIONED BY SAID SHAFT MEMBER TO CONTACT SAID PIN, THE FORCE EXERTED BY SAID SPING UPON SAID SHAFT MEMBER OPPOSING THE FORCE EXERTED BY SAID THREMOSTAT WHEREBY SAID THREMOSTAT EXERTS A CLOSING BIAS ON SAID CHOKE TO REDUCE THE AIR-FUEL RATIO IN RESPONSE TO A DECREASE IN TEMPERATURE, SAID CHOKE BEING ADAPTED TO OPEN IN OPPOSITION TO THE BIAS EXERTED BY SAID THERMOSTAT IN RESPONSE TO A PREDETERMINED INCREASE IN ENGINE VACUUM TO THEREBY INCREASE THE AIRFUEL RATION, SAID SHAFT MEMBER ROTATING TO CAUSE SLIDING CONTACT OF SAID SPRING AGAINST SAID PIN AND COIL SAID SPRING TO INCREASE THE FORCE OF SAHD SPIRNG OPPOSING THE FORCE OF SAID THREMOSTAT AND LIMIT THE CLOSING BIAS EXERTED BY SAID THERMOSTAT ON SAID CHOKE WHEREBY A PREDETERMINED INCREASE IN ENGINE VACUUM WILL CAUSE SAID CHOKE TO OVERCOME THE CLOSING BIAS OF SAID THERMOSTAT AND INCREASE THE AIR-FUEL RATIO AFTER STARTING THE ENGINE.