Carburetor

A carburetor as for a gasoline engine, comprising:

• a housing having connecting air-intake and gas-mixing chambers, a slide-valve member, adjustably mounted between said chambers, and having a venturi-aperture means of variable flow area therethrough, for passage of air from said air-intake chamber to said gas-mixing chamber with correspondingly varying venturi effect on said air;
• means for adjusting said slide-valve member to vary the flow area of said venturi aperture means, and a gas metering device presented within said gas-mixing chamber, for supplying gas to said gas-mixing chamber for convergence with said air passed through said venturi aperture means;
• said gas metering device including relatively movable parts to vary the supply of gas to said chamber, said relatively movable parts of the gas metering device including a relatively fixed tube having therein a plurality of gas metering holes, and a gas supply tube relatively movable with reference to said relatively fixed tube, to open and close one or more said gas metering holes to said gas mixing chamber, said gas supply tube having a gas outlet orifice in a free end thereof presented within said gas mixing chamber;
• and a tapered stem being affixed to said housing to extend into said gas supply tube through said outlet orifice to vary the effective gas flow area thereof in proportion to relative movement of the supply tube, said slide-valve member including vacuum aperture means communicating with said venturi-aperture means;
• and accelerator speed-control means operable by variations in vacuum effect in said vacuum aperture means to adjust the size of the venturi opening, with resultant proportional automatic adjustment of the amount of gas being mixed with air passing through the effective venturi opening.