US2233523A - Carburetor - Google Patents

Description

March 4, I A. FQRGAR 2,233,523

CARBURETOR Filed Oct. 28, 1958 Jrv Patented Mar. 4, 1941 UNITED STATES PATENT OFFICE CARBURETOR I Albert H. Forgar, Los Angeles, Calif.

Application 0ctober'28, 1938, Serial No. 237,504 2Claims. 7 (01. 48-180) My invention relates to a carburetor and has for its principal objects, to generally improve upon' and simplify theconstruction of the existing forms of carburetors and particularly those types of carburetors that function to produce a combustible mixture of air and gaseous fuel, further, to provide a carburetor of the character referred to that comprises few parts, capable of-bein'g easily and conveniently adjusted so as'to accurately regulate the flowof gaseous fuel into the column of air passing through the carburetor and further, to provide a carburetor having a Venturi throat or passage through which the gas and air passes so as to produce a thorough mixture thereof. A further object of myinvention is, to provide a carburetor having a Venturi passage through which the air is drawn and the carburetor being provided with means for providing'an annular slot or opening that establishes direct'communication between a chamber that is supplied with gaseous fuel and the Venturi passage, so that the column of air as it travels past-the annular slot or openingthat admits the gaseous fuel will meet and combine with said gaseous fuel throughout a circular zone immediately prior to the point where the air and gaseous fuel mixed therewith passes into that portion of the Venturi that gradually increases in diameter.

A further object of my invention is, to provide a carburetor comprising three main parts, two of which have abutting ends that are connected by the third part and the latter being provided with an annular chamber that receives gaseous fuel from a suitable source of supply and one of the parts of the carburetor being ad.- justably connected to the intermediate member,

. so as to enable the annular slot through which the gaseous fuel passes into the Venturi throat or passage way to be very accurately regulated in width and, consequently enabling the carburetor to be adjusted so as to operate at maximum emciency and in accordance with the .gaseous fuel that is used in producing the combustible mixture.

A further object of my invention is, to provide a device of the character referred to that may be utilized as a fuel inlet and mixing device.

With the foregoing and other objects in view, my invention consists in certain novel features of construction and arrangement of parts that will be hereinafter more fully described and claimed "and illustrated in the accompanying drawing in which:

Fig. 1 is a top plan view of a carburetor constructed in accordance withmy invention.

Fig. 2 is a vertical cross section taken on the 5 line 2-2 'of Fig. 1.

Fig. 3 is a side elevational view taken looking in the direction indicated by the arrow 3, Fig. 1.

Fig. 4 is a horizontal section taken on the line 4-4 of Fig. 2. 10

Referring by numerals to the accompanying drawing which illustrates a preferred embodiment of my invention, In designates a short tubular body, one end of which is provided with a flange l l or otherwise constructed so that it may be conveniently applied to an internal combustion engine or other structure with which the carburetor is associated. The opposite end of member I0 is constructed so that the opening therethrough gradually increases in diameter to- .20 ward the intermediate portion of said member, thus forming a Venturi throat l2 of graduallyincreasing diameter.

Mounted for operation within member [2 just beyond the large 'end of the throat I2 is a conventional butterfly valve l3 which when actuated controls the new of combustible mixture through the carburetor.

The end of member l0 opposite the end pro. vided with the flange H is provided with an 'ex ternal thread l4 that receives the internally threaded end of the intermediate or connecting member [5 of the carburetor. This member I5 is in the form of a ring or collar having an internally arranged annular chamber I6 for the gaseous fuel and the latter being delivered to said chamber by a suitable pipe or duct IT.

This pipe or duct leads from a suitable source of gaseous fuel supply and a conventional pressure regulator and a valve or valves not shown 40 may be associated with the tube 11, in order to control the flow of gaseous fuel therethrough.

Theend of connecting member I5 opposite the end that is connected to member ['0 is :internally threaded for the reception of the third member l8 of the carburetor, said member being shaped somewhat similar .to a funnel and having an inlet throat I9 that gradually decreases in diameter from its outer end to its inner end.

The threaded connection between members l5 and I8 is such that member l8 may be readily rotated so as to be screwed into or out of member l5 and, to retain the member I8 in its adjusted position the free end of a spring 28 that I slightly less than the diameter of the adjacent end of throat I2 in member I0. As a result of this construction, when member I8 is adjusted so as to position its inner end apart from the adjacent end of. member I an annular slot 23 is formed between'the annular fuel distribution chamber l6 and thaVenturi passage through the carburetor.

The inner circumference of this slot com municates with the Venturi throat just beyond the inner end of the throat IS in member I8 and with the slightly larger end of the throat I2 in member I0, 50 that the column of air passing through throat I9 will receive at all points throughout its circumference gas as it discharges from the inner circumference of slot 23 and, as a result a more uniform mixture of the gas and air is brought about, This effect is enhanced by reason of the fact that the smallest end of throat I2 is slightly larger in diameter than the small end of throat I9 in the air inlet member I8.

In the use of my improved carburetor, air inlet member I8 may be screwed into or out of member I so as to vary the width of slot 23 that admits gaseous fuel to the column of air flowing through the Venturi passageway and, thus the degree of carburation may be very accurately regulated.

After being set or adjusted, member I8 may be secured in such adjusted position by the engagement of the free end of spring 20 in one of the notches 22.

Thus, it willbe seen that I have provided a carburetor that includes a pair of tubular members with the ducts or openings through said members contoured so as to form a venturi and said members being adjustably connected so that one member may be moved toward or away from the other member to provide a variable annular slot for the admission of gaseous fuel to the column of air passing through the carburetor and, said gaseous fuel inlet slot being located at the point in the Venturi passageway where there is the strongest suction so that the device will function advantageously even though the gaseous fuel is not under pressure above that of the atmosphere.

An especially desirable feature of my invention is, the provision of an adjustable annular slot that controls the admission of gaseous fuel to the column of air passing through the carburetor and the arrangement whereby the admitted gaseous fuel is delivered to the column of air at all points throughout its circumference, together with the arrangement whereby the air and the gas admitted thereto are permitted to expand slightly at the point where the gas is admitted and further expansion and consequent mixture of the gas and air taking place as it passes through that portion of the venturi that gradually increases in diameter beyond the admission point of the gaseous fuel. I

In some instances, it may be found desirable and advantageous to form the ring .or collar I5 integral with the body member III, with member I8 arranged to screw into "the upper portion of said ring or, said ring may be formed integral with member I8 and screw on to the upper end of body member III. The device thus constructed in two main parts would function the same as the construction herein illustrated and described or where the device comprises three parts.

Thus,,it will be seen that I have provided a carburetor that is relatively simple in construction, strong and durable, capable of being readily adjusted so as to accurately control the degree of carburation and which carburetor without change may beadvantageously employed as a fuel mixer and inlet forvarious purposes. It will be understood that minor changes in the size, form and construction of the-various parts of my improved carburetor, may be made and substituted for those herein shown and described, without departing fromthe spirit of my invention, the scope of which is set forth in the appended claims.

I claim as my invention: j,

l. A carburetor comprising a pair oftu ular members arranged end to end, a member connecting said tubular members, which member is provided with an annular chamber that surrounds the adjacent ends of said tubular members, means for supplyinggaseous fuel to said chamber, the opening through one of saidmembers being contoured to form a venturi, the other tubular member being screw seated'in the connecting member so as to be adjusted toward and away from the-other tubular memberso as to provide an adjustableannular slot that establishes communication between said annular chamber and theventuri passage, said adjustable tubular member being provided with a throat that tapers toward its inner end and the inner end of whichthroat is smaller in diameter than the small end of the venturi in the other tubular member and a throttle valve arranged for operation within the tubular member having'the venturi. v

2. A carburetor as set forth in claim 1, with a flange formed on the outer end of the. tubular member having the tapered throat, said flange being provided with a plurality of notches and a resilient member having one end fixed to the member that connects the two tubular members with the free end of said resilient memberengaging said notched flange.

ALBERT H. FORGAR.

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