Carburetor

A carburetor comprising a float chamber, an air vent in communication with said float chamber for supplying air to said float chamber so that fuel in the chamber may be smoothly discharged via a nozzle, valve means interposed between said air vent and said float chamber for closing off said air vent when a vehicle containing the carburetor is excessively inclined or upset, said valve means comprises a valve box, a piston-shaped valve slidable within said box for opening or closing said air vent, a passageway formed in said valve, an inner chamber formed between said piston-shaped valve and said valve box on the opposite side of said piston-shaped valve from said float chamber, a negative pressure transmission line having one end connected to said inner chamber and the other end connected to the intake manifold of the carburetor, and spring means located within said inner chamber for biasing said piston-shaped valve toward said float chamber.

In a carburetor having an air horn, a choke valve, a venturi, a throttling valve, a discharge nozzle, a float chamber, and an air vent in communication with said float chamber, the improvement comprising valve means located within said float chamber and said air vent for closing said air vent under the pressure of the fuel within said chamber when a vehicle is excessively inclined or upset, said valve means comprises a valve box and a piston-shaped valve movable within said valve box, said piston-shaped valve having a passage formed therein in communication with said air vent, and said passage having one end open at the bottom surface of said piston-shaped valve and its other end open at a side surface of said piston-shaped valve.

In a carburetor having an air horn, a choke valve, a venturi, a throttling valve, an intake manifold, a discharge nozzle, a float chamber, a float within said float chamber for maintaining the level of fuel therein below the upper end of said float chamber, and an air vent in communication with said valve chamber, wherein the improvement comprises a valve box mounted on and extending upwardly from the upper end of said float chamber and being open to the interior of said float chamber, said valve box having a tubular shaped side wall extending upwardly from the upper end of said float chamber and a top wall extending across the upper end of said side wall spaced from said float chamber, said air vent connected to said side wall, and a piston-shaped valve positioned within said valve box and slidably displaceable along said side walls thereof, said piston having a passage formed therein and said piston being displaceable within said valve box between one position admitting flow through the passage in said piston-shaped valve from said air vent to said flow chamber and another position for blocking flow between said air vent and said float chamber.