Carburetor with automatic choke

Claim 1

In a carburetor assembly having a throttle valve and equipped with an automatic choke including a choke valve, and thermostatic means responsive to exhaust gas temperature for controlling operation of said choke valve, the improvement including means for rendering operation of said choke valve dependent upon the position of said throttle valve, said improvement comprising, in combination, a choke valve shaft connected with said choke valve to rotate concurrently with displacement thereof, a throttle valve shaft connected with said throttle valve to rotate concurrently with displacement thereof, a throttle lever revolvably mounted upon said throttle valve shaft, a choke arm revolvably mounted upon said choke valve shaft, means defining a slot in said throttle lever, a linkage arm connected between said choke arm and said slot in said throttle lever, a choke valve coil spring, concentrically located about said choke valve shaft and having a pair of ends, with one of said ends connected to impart a spring force to said choke valve shaft and with the other of said ends being connected to said choke arm, and a throttle valve coil spring concentrically located about said throttle valve shaft and having a pair of ends, one of said ends being connected with said throttle valve shaft and the other of said ends being connected with said throttle lever, said slot in said throttle lever being configured to impart a force from said throttle lever to said linkage arm only after said throttle lever has reached a predetermined position by displacement of said throttle valve beyond a predetermined location.