Carburetor apparatus

Claim 2

In a carburetor for mixing a liquid fuel with a gas, the combination of a conduit positioned to direct said gas into an incoming stream, means defining an annular venturi about said conduit, said venturi having a throat portion for reducing the static pressure of said stream of gas, a reservoir spaced below said throat portion for containing a supply of fuel, a plurality of vertically elongate hollow tubes each having an inlet end in fluid communication with fuel contained in said reservoir and having an outlet end in discharge relationship with said venturi throat portion, a plurality of elongate tube inserts, each insert being mounted in a respective one of said tubes and being radially spaced from the inner surface thereof to define a capillary fuel flow passageway, each insert being mounted for vertical and lateral displacement with respect to the tube inner surface associated therewith, and means to limit the vertical displacement of each insert between an upper position assumed under the influence of reduced static pressure of gas in said venturi throat portion and a lower position assumed under influence of gravity acting on said insert.

Claim 3

In a carburetor apparatus, the combination comprising means forming a reservoir containing a liquid fuel, means forming a continuous passageway for directing a stream of gas through said carburetor, said last mentioned means including means forming a venturi having a throat portion, fuel jet means for directing fuel from said reservoir into said stream of gas, said fuel jet means including one or more substantially vertically extending eLongate tubes, each tube being formed with an inner cylindrical surface having a length extending between an inlet disposed in said reservoir in communication with said contained fuel and an outlet disposed in said venturi throat portion, an elongate insert carried within each of said tubes and being radially spaced from said inner cylindrical surface to define a fuel flow passageway therewith, means forming upper and lower spaced stop surfaces in substantially vertical register and disposed below said tubes, weight means formed on the lowermost ends of each insert and disposed between said stop surfaces, and means mounting each insert for movement axially within its associated tube between extreme positions in which said weight means contacts, respectively, said upper and lower surfaces responsive to the resultant force acting on said insert from the force of gravity and the pressure force differential acting on the insert as a combination of static gas pressure within said venturi and fuel pressure within said reservoir whereby said movement of each insert dislodges any foreign matter disposed in said flow passageway, each insert being sized in length sufficiently greater than said length of the associated tube inner cylindrical surface whereby the cross sectional area of the flow passageway therebetween is independent of the axial position assumed by the inserts with respect to the tubes.

Claim 4

In a carburetor apparatus, the combination comprising means forming a reservoir containing a liquid fuel, means forming a continuous passageway for directing a stream of gas through said carburetor, said last mentioned means including means forming a venturi having a throat portion, fuel jet means for directing fuel from said reservoir into said stream of gas, said fuel jet means including one or more substantially vertically extending eLongate tubes, each tube being formed with an inner cylindrical surface having a length extending between an inlet disposed in said reservoir in communication with said contained fuel and an outlet disposed in said venturi throat portion, an elongate insert carried within each of said tubes and being radially spaced from said inner cylindrical surface to define a fuel flow passageway therewith, means forming upper and lower spaced stop surfaces in substantially vertical register and disposed below said tubes, weight means formed on the lowermost ends of each insert and disposed between said stop surfaces, and means mounting each insert for movement axially within its associated tube between extreme positions in which said weight means contacts, respectively, said upper and lower surfaces responsive to the resultant force acting on said insert from the force of gravity and the pressure force differential acting on the insert as a combination of static gas pressure within said venturi and fuel pressure within said reservoir whereby said movement of each insert dislodges any foreign matter disposed in said flow passageway, each insert being sized in length sufficiently greater than said length of the associated tube inner cylindrical surface whereby the cross sectional area of the flow passageway therebetween is independent of the axial position assumed by the inserts with respect to the tubes.