Throttle lock-out arrangement

Claim 1

A fuel induction device for an internal carburetion engine, comprising a body, primary and secondary induction passage means formed through said body, primary and secondary throttle valves respectively situated in said primary and secondary induction passages for controlling the flow of motive fluid therethrough, a choke valve pivotally mounted in the primary induction passage upstream of said primary throttle valve, first means including a thermostatic element associated with said choke valve and effective for permitting said choke valve to move from a fully closed cold position to a fully opened position at a first predetermined lower minimum engine temperature, said choke valve being free to open fully against the decreasing resistance of said thermostatic element as engine temperature increases, and said thermostatic element being free to move beyond its choke open position in response to further increasing temperature and second means associated with said secondary throttle valve for preventing said secondary throttle valve from being opened until both said choke valve is fully opened and a predetermined second higher minimum engine temperature is attained subsequent to said choke valve being fully opened, the freedom of said secondary throttle valve to open thereafter being dependent upon said thermostatic element moving beyond its choke open position.