Internal-combustion engines – Charge forming device – Combined liquid and gaseous fuel
Reexamination Certificate
1999-12-22
2001-08-21
Kamen, Noah P. (Department: 3747)
Internal-combustion engines
Charge forming device
Combined liquid and gaseous fuel
C123S527000
Reexamination Certificate
active
06276345
ABSTRACT:
STATEMENT REGARDING FEDERALLY SPONSORED RESEARCH
Not Applicable
FIELD OF THE INVENTION
The field of the invention relates to internal combustion engines, more particularly to an adaptor for modifying an internal combustion engine to accommodate dual fuels.
DESCRIPTION OF THE BACKGROUND ART
Engines having dual fuel systems are capable of consuming liquid fuel, such as gasoline, and gaseous fuel, such as propane. This dual fuel capability is advantageous when an engine is required to work indoors where the exhaust from a gasoline engine is unacceptable, and outdoors where the power requirements of the engine may exceed the capabilities of a propane burning engine.
Dual fuel systems for internal combustion engines, such as disclosed in U.S. Pat. No. 4,492,207, are known in the art. These systems typically require a venturi type mixer having a narrow control range for metering combustion air mixing with the gaseous fuel. The narrow control range of a venturi complicates the mixer design when the engine operation requires a high and low speed.
Furthermore, dual fuel systems are often integrated with the liquid fuel carburetor. A dual fuel carburetor is more expensive to make and has a limited market.
SUMMARY OF THE INVENTION
The present invention provides a gaseous fuel adaptor for modifying an internal combustion engine having a conventional liquid fuel carburetor. The carburetor has an air intake for receiving air to mix with a liquid fuel. The adaptor includes a body mounted over the carburetor air intake, and a passageway having an inlet and an outlet formed in the body. Air enters the passageway through the inlet and exits the passageway through the outlet into the carburetor air intake. A gaseous fuel feed port disposed between the passageway inlet and outlet feeds gaseous fuel into the passageway, and a butterfly valve disposed in the passageway between the gaseous fuel feed port and the passageway inlet meters air passing through the passageway.
A general objective of the present invention is to provide an adaptor for use with a liquid fueled internal combustion engine which provides a gaseous fuel for use in the engine. This objective is accomplished by providing an adaptor which mounts over a carburetor intake of the liquid fueled internal combustion engine and provides a gaseous fuel/air mixture into the carburetor.
The foregoing and other objects and advantages of the invention will appear from the following description. In the description, reference is made to the accompanying drawings which form a part hereof, and in which there is shown by way of illustration a preferred embodiment of the invention.
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Dudzinski Christopher R.
Nelson Dean M.
Thiel Timothy S.
Kamen Noah P.
Kohler Co.
Quarles & Brady LLP
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