GB265906A - Improvements in carburetters for internal combustion engines - Google Patents

Abstract

265,906. Seignol, E. Feb. 10, 1926, [Convention date]. Spray carburettors.-In carburettors wherein a primary carburetting means produces a rich mixture which is introduced into the air stream of a secondary carburetting means, the amount of rich mixture admitted to the secondary carburettor is controlled in accordance with the position of the throttle valve, and an air valve in the secondary carburettor adapted to be opened by the drop of pressure therein, has its opening retarded by a dash-pot or the like. The primary carburetting means comprises a venturi tube g to which fuel is supplied from a tank i through a pipe h which may communicate with the outer air through a series of orifices h<1>, h<2>, h<3> and a tube v. The rich mixture is conveyed through a pipe f to the seating j of a valve kand thence through a pipe e<1> and tube e to the engine side of the throat c<1> of a venturi c. Air may be admitted to the pipe e<1> in constant quantities through the bone of a screw t and in variable quantities through a passage u around the screw. The valve k is pressed towards its seat by a spring m and has a collar s engaged by the forked end of a bell-crank lever o, p pivoted at q. The other end of the lever is provided with an adjustable portion r which engages a cam n on the spindle of the throttle valve d. The actuating means are so adjusted that the valve k is slightly open when the throttle is closed so as to supply mixture for slow-running. To ensure good acceleration when the valve d is opened suddenly, the secondary carburetting passage a, Fig. 1, is provided with a suction-actuated hinged air valve w, the spindle x of which is connected through linkage y, z to the rod 1 of a piston 2 of smaller area than the air valve. This piston slides in a cylinder 3 which communicates with the atmosphere at 6 and with the engine side of the throttle d through a duct 4 controlled by a valve 5. The device serves to close the valve w when the throttle is closed and to prevent the valve from opening suddenly upon sudden opening of the throttle valve. Specifications 251,584 and 265,904 are referred to. Reference has been directed by the Comptroller to Specification 193,706..