Automobile engine carburetors

Claim 1

In an automobile engine carburetor comprising, a main housing, a choke valve provided in said main housing, a venturi throat formed in said main housing and spaced below said choke valve, a throttle valve provided in said main housing and spaced below said venturi throat, an auxiliary housing connected to said main housing adjacent to said choke valve, a coiled bimetallic strip provided in said auxiliary housing and associated with said choke valve to control the position of said choke valve automatically in response to variation in the temperature of the air in said auxiliary housing, and means provided in said auxiliary housing for electrically heating said bimetallic strip, the improvement which comprises, a first air passageway having an inlet open into said main housing upstream of said venturi throat and an outlet open into said auxiliary housing, a second air passageway having an inlet open into said auxiliary housing and an outlet open into said main housing downstream of said inlet of said first air passageway, the static pressure of said main housing being lower at said outlet of said second air passageway than at said inlet of said first air passageway, and valve means provided in said auxiliary housing and adapted to close one of said first and second air passageways to stop the flow of fresh air into said auxiliary housing when said temperature is below a predetermined level, while opening said one air passageway upon elevation of said temperature to said predetermined level to resume said flow of fresh air through said auxiliary housing.