Abstract A diaphragm carburetor system and construction in which the fuel supply for the main jet and the idle jet is brought from a diaphragm chamber through a main jet control valve and the idle jet control valve in series. A passage is provided in the carburetor to receive crankcase pulses from the two-cycle engine being controlled, and to expose these pulses to the idle system so that under full throttle conditions the pulses will be open to the idle system to blow collected fuel in that system back to the main jet as an acceleration charge and also to dry out the idle system so that upon the closing of the throttle there will be a delayed fuel flow through the idle system to prevent overrich comedown. This is accomplished by surface passages and a circuit gasket in the top wall of the diaphragm chamber to simplify the construction of the system.
A diaphragm carburetor of the type having a body with a mixing passage, a main nozzle port and idle ports leading thereto and fuel passages from a fuel inlet to said ports, means forming a portion of said passages comprising: a. a diaphragm chamber having one wall formed by a flat surface of said body, b. surface passages recessed into said surface to form partial passages, c. a circuit gasket having perforate passages therein to lie in part over said surface and in part over said surface passages to form continuous passages, d. a closing plate overlying said circuit gasket to close said perforate passages on one side of said gasket and to confirm and isolate said passages in said surface and said gasket while also serving as a wall of said diaphragm chamber, and e. means to press said closing plate firmly against said gasket and said gasket against said surface.
Claim 2
Dependent Claim
152 words
A diaphragm carburetor of the type having a body with a mixing passage, a main nozzle port and idle ports leading thereto and fuel passages from a fuel inlet to said ports, means forming a portion of said passages comprising: a. a diaphragm chamber having one wall formed by a flat surface of said body, b. surface passages recessed into said surface to form partial passages, c. a circuit gasket having perforate passages therein to lie in part over said surface and in part over said surface passages to form continuous passages, d. a closing plate overlying said circuit gasket to close said perforate passages on one side of said gasket and to confirm and isolate said passages in said surface and said gasket while also serving as a wall of said diaphragm chamber, and e. means to press said closing plate firmly against said gasket and said gasket against said surface.