Gas and liquid contact apparatus – Fluid distribution – Valved
Reexamination Certificate
1999-05-03
2001-08-07
Chiesa, Richard L. (Department: 1724)
Gas and liquid contact apparatus
Fluid distribution
Valved
C261SDIG003
Reexamination Certificate
active
06270060
ABSTRACT:
TECHNICAL FIELD
This invention relates to a carburetor for supplying fuel to an air flow passage where such fuel is mixed with air to form an air/fuel mixture prior to such mixture being admitted to a combustion chamber of an internal combustion engine. More particularly, this invention relates to a slide carburetor having a vent hole in the slide.
BACKGROUND OF THE INVENTION
Carburetors are known for supplying fuel to an air flow passage of a carburetor or similar device where such fuel is mixed with air to form a combustible air/fuel mixture. Such carburetors have one or more fuel jets which are usually located in a venturi portion of the air flow passage, upstream of the throttle plate, such that the vacuum produced in the venturi portion helps draw fuel through the jet and into the air flow passage. Some carburetors may have multiple jets located in the air flow passage. For example, a slow jet may be provided for supplying fuel at idle or at low speeds and a main jet may be provided for supplying fuel at midrange or high speeds.
The main fuel jets used in such carburetors often have a flow controlling needle that is reciprocally contained within the fuel flow passage of the fuel jet. The amount of fuel delivered by the fuel jet is controlled by sliding the needle into or out of the fuel jet using a reciprocal slide that is mounted in the carburetor body. The upper end of the needle is connected to the slide such that vertical up and down movement of the slide is translated into vertical up and down movement of the needle. The needle includes a tapered section which creates a bigger gap between the outer diameter of the needle and the fuel flow passage of the fuel jet as the needle rises, thus increasing the fuel flow through the main jet as the needle rises in the main jet.
A vent hole is typically provided in the slide on the bottom of the slide. The Applicant has discovered that varying the size of the vent hole affects how quickly the slide moves up and down and, thus, affects the engine performance. However, in known slide carburetors, there is no way to easily and quickly adjust the size of the vent hole.
SUMMARY OF THE INVENTION
One aspect of this invention relates to a slide carburetor with a vent hole and, more particularly, to a valve that is movably carried on the slide to adjust the size of the vent hole.
These and other aspects of this invention are provided by a slide carburetor which comprises a reciprocal slide that moves up and down in an air flow passage. Movement of the slide controls the amount of fuel supplied to the air flow passage for mixing with air. A vent hole on the slide has an adjustable size to adjust the rate of movement of the slide.
Another aspect of this invention is provided in an air/fuel mixing device which comprises a fuel jet for supplying fuel to an air flow passage. The fuel jet has a fuel flow passage that is operatively connected to the air flow passage for conducting fuel from a supply of fuel through the fuel jet and into the air flow passage. A flow controlling needle is reciprocally mounted by a slide in the fuel flow passage of the fuel jet to control the amount of fuel that flows therein. A vent hole is located on the slide. A valve is movably carried on the slide to adjust the size of the vent hole.
A final aspect of this invention relates to a carburetor which comprises a fuel jet having a reciprocal needle received therein for controlling fuel as the fuel flows into an air flow passage of the carburetor. A reciprocal slide is provided which includes a vent hole in a bottom surface of a hollow chamber located within the slide, wherein the needle is carried on the slide. A rotatable valve plate is carried inside the chamber in the slide such that the valve plate overlies the vent hole, wherein the valve plate is movable between various adjusted positions relative to the slide for changing the size of the vent hole.
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patent: 60-138262 (1985-07-01), None
patent: 2-123270 (1990-05-01), None
Chiesa Richard L.
Miller James W.
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