GB158737A - An automatically operating carburetor for internal combustion engines - Google Patents

Abstract

158,737. Johnson, C. E. Nov. 20, 1919. Spray carburettors.-Relates to carburettors having a suction-operated air valve which automatically actuates the fuel-valve, the arrangement being such that the fuel-valve may be independently operated if desired. According to the invention, the free end of a lever controlling the fuel valve extends into the path of the air valve, the fuel valve being movable if necessary independently of the lever. The suction-operated cylindrical valve 8 sliding freely in the casing 2 controls the passage of air through a V-shaped port 11 and over a fuel jet 17 controlled by a vertically sliding spring-controlled needle 27. The mixture passes to the engine through a butterfly throttle valve 10 controlled by a lever 53 having wings engaging a fixed stop to limit the opening and closing movements. The needle 27 is connected by an adjustable coupling 26 to a rod 24 the upper end 25 of which is engaged by the forked end of an arm 35, the other end of which is pivotally connected to the cover 5. The arm 35 is lifted automatically as the air valve rises bv the fuel-valve control lever 38, the upper end of which pivots on an eccentric pin 42. The lower end 39 of the lever 38 engages a tapered hole 12 in the air valve as this rises, and an intermediate part 40 engages a projection 37 on the arm 35. To flood the carburettor at starting the needle valve 27 is raised by hand through a lever 51 and crank pin 50, Fig. 5. The initial relative positions of the lever 38 and arm 35 may be adjusted either by rotating the eccentric pivot pin 42 by an arm 45 or by vertically adjusting the pivot 34a by turning a milled nut 34.