Carburetors

Details Carburetors Carburetors

1987-04-23

1989-03-07

Miles, Tim

Gas and liquid contact apparatus

Fluid distribution

Pumping

261 51, 261DIG8, 261DIG68, F02M 116

Patent

active

048104272

ABSTRACT:
A carburetor comprises a main body portion defining a venturi having an air intake side and an engine outlet side, a throttle shutter mounted within the venturi between the air intake side and the engine outlet side, a fuel chamber for supplying fuel into the venturi via a main discharge port and at least one idle discharge port, the main discharge port opening into the venturi on the air intake side of the throttle shutter, a choke feed passage extending from the fuel chamber to the venturi, the choke feed passage opening into the venturi on the opposite side of the throttle shutter to the main discharge port, and means for selectively opening and closing the choke feed passage. The fuel chamber comprises a metering diaphragm and the choke feed passage supplies pure fuel to the venturi, the carburetor being responsive to a lower pressure in the venturi on the engine outlet side of the throttle shutter than on the air intake side, when the throttle shutter is in a partially opened position and the choke feed passage is open, to cause fuel to be drawn from the fuel chamber primarily through the choke feed passage into the venturi on the engine outlet side of the throttle shutter.

REFERENCES:
patent: 1222562 (1917-04-01), Rayfield
patent: 1264464 (1918-04-01), Weld
patent: 1384429 (1921-07-01), Cole
patent: 3807371 (1974-04-01), Nutten et al.
patent: 4447370 (1984-05-01), Kobayashi et al.
patent: 4455266 (1984-06-01), Gerhardy
patent: 4509472 (1985-04-01), Slattery

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