Variable venturi carburetors

Claim 1

A variable venturi carburetor having oppositely disposed inet and outlet ends and a fuel reservoir, and comprising: a through passageway mixture conduit means defined in said carburetor between said carburetor''s inlet and outlet ends for providing a place to vaporize fuel and mix it with air; a nozzle tube conduit defined in said carburetor and adapted to discharge into said through passageway mixture conduit means intermediate said carburetor''s inlet and outlet ends; a vacuum sustaining plate swingably mounted to open and partially close said inlet end for controlling admission of air and for generating venturi effects in said through passageway mixture conduit means that are variable with the swingable positions of said vacuum sustaining plate, said vacuum sustaining plate having a pair of flat plates transversely spaced apart by reversely channeled plates, all said plates in combination defining a center hole adapted to receive said nozzle tube conduit, and the reversely channeled plates being adapted to nest with said nozzle tube conduit when swung for their respective channels to be concentric therewith; throttle plate means swingably mounted to open and partially close said outlet end of said carburetor for controlling amount of output therefrom; and fuel orifice means defined in said nozzle tube conduit and in said through passageway mixture conduit means connected to said fuel reservoir and discharging between said vacuum sustaining plate means and said outlet end for providing fuel in amounts dependent on flow of air in said conduits as per said generated venturi effects.