Valve control for back draft carburetor
AssigneeBrunswick Corporation
InventorJames M. Hundertmark
Life of this patent
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Abstract
A back draft carburetor of the type in which a vacuum source in the throat of a carburetor is communicated to the air space above the fuel in the float bowl of the carburetor includes a valve disposed between the vacuum source and the float bowl. At low vacuum levels in the carburetor throat, the valve is in a closed position in which the vacuum in the carburetor is sealed off from the float bowl. Upon sensing a higher vacuum level, the valve moves to an open position which allows the vacuum in the carburetor throat to be communicated to the air space in the float bowl.
Claims8
In a back draft carburetor of the type in which a vacuum source in the throat of the carburetor adjacent the upstream edge of the throttle valve is communicated to the air space above the fuel in the float bowl of the carburetor, a back draft control comprising:
- a housing having a first port communicating with the vacuum source and a second port communicating with the air space above the fuel in the float bowl,
- a sealing member disposed for slideable movement within said housing between a closed position in which communication between said first and second ports is prevented and an open position in which communication between said first and second ports is allowed, and
- biasing means urging said sealing member to said closed position,
- said sealing member being responsive to the vacuum level so that upon sensing a sufficient vacuum in the carburetor throat said sealing member overcomes said biasing means and moves to said open position.
Dependencies are inferred from the claim text.