Fast idle assembly for carburetors having automatic choke

Claim 1

A carburetor of the automatic choke type including a fast idle mechanism for an internal combustion engine comprising a throttle valve, a choke valve, a choke shaft having said choke valve fixedly mounted thereon, a choke lever mechanism fixedly mounted to said choke shaft, a fast idle cam revolvably mounted to said choke shaft, linkage means operatively interconnecting said fast idle cam and said throttle valve to control the idling position of said throttle valve, first spring means operatively connected between said choke lever mechanism and said fast idle cam to effect a predetermined angular displacement therebetween, and second spring means having a first and a second end with the first end of said second spring means fixed relative to said carburetor and with the second end of said second spring means including a first engagement member for engaging said choke lever and a second engagement member for engaging said fast idle cam, said second spring means being thermostatically responsive to the operating temperature of said engine to control the opening of said choke valve and the working angle of said fast idle cam, said second thermostatically responsive spring means cooperating with said first spring means to effect continued operation of said fast idle mechanism for a period of time after said choke valve has fully opened.