Dec. 2, 1947. L. E. OLIVER ET AL 2,431,958 CARBURETOR Filed Nov. 21, 1944 2 Sheets-Sheet 2

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| 36 AttorneyS Patented Dec. 2, 1947 2,431,953

UNITED STATES PATENT of FICE 2,431,958 CARBURETOR Leo E. Oliver, Sanger, and Ray Carson, Sr., Wallejo, Calif. Application November 21, 1944, Serial No. 564,450 16 Claims. (CI. 48—180) 2 This invention is directed to, and it is an ob diagonally disposed when closed as shown in Fig. ject to provide, a carburetor especially designed 1. The shaft 5 is fitted outside body with a lever for use in a motor vehicle fuel System which in to which a control rod 8 connects, said rod ex cludes a fuel reservoir containing a gaseous fuel, tending from the throttle pedal in the operator's Such as natural gas, under high pressure, a con Compartment. duit leading from the reservoir to the carburetor, The body forms the mixing chamber 9 of the and a pressure regulator interposed in the con carburetor, and a tubular, cylindrical housing 0 duit; Such a fuel System being advantageous for projects laterally from body intermediate its automobiles, trucks, motor boats, and aircraft. ends; such housing being initially open at its Another object of the invention is to provide O outer end, and communicating at its inner end a gaseous fuel carburetor which is constructed With chamber 9 directly above the low side of the so as to effectively and economically meter the butterfly valve 6 when the latter is closed. fuel, in correct proportions, at both low and high A tubular sleeve closely and Symmetrically engine speeds; the carburetor including an effec engages in housing 0, and adjacent its outer end tive idling feed to maintain the engine in opera 5 this sleeve is threaded into the housing as at 2 tion when the throttle is closed. for axial adjustment. The sleeve is normally An additional object of this invention is to pro but releasably held in locked position by a nut 3 vide a carburetor which requires no air choke threaded thereon and abutting the adjacent end mechanism for ease of starting. of housing 0. A further object is to provide a carburetor for 20 The sleeve carries the low and high speed gaseous fuel, arranged. So that exterior gas leaks valve assembly, which comprises the following: cannot occur, as all Working parts of the car A tubular plunger 4 is slidably disposed in buretor are Subject to vacuum from the engine. sleeve if with its inner end intermediate the It is also an object to incorporate, in the car sleeve ends; said inner end of the plunger being buretor, a low speed valve, and a high speed valve 25 formed as an annular, radially projecting flange in unique combination; such valves being actu 5 riding in the sleeve. A closure plug 6 is ated in progressive order by a novel cam arrange threaded as at into the housing at its outer ment operated from the butterfly valve support end, and a helical compression spring 8 engages ing throttle Shaft of the device. between said plug and the flange 5 normally These objects are accomplished by means of 30 urging plunger 4 toward body . In the ad such structure and relative arrangement of parts vanced position of the plunger, an annular, taper as Will fully appear by a perusal of the following valve 9 thereon engages a cooperating seat 29. Specification and claims. formed in the inner end of sleeve . This is the In the drawings similar characters of reference high speed valve of the carburetor, and adjacent indicate corresponding parts in the several views: 35 but short of said valve 9 there is space between Figure 1 is a sectional elevation of the improved the sleeve f l and plunger 4 forming a gas flow carburetor, with the low and high speed valves chamber 2 which communicates with the inte closed. rior of plunger 4 by means of a circumferential Figure 2 is a similar view, on reduced scale, but row of ports 2d. in the latter. The inner end por showing the low speed valve Open, 40 tion of plunger 4 projects beyond sleeve to Figure 3 is similar to Fig. 2, but shows both a termination in radial alinement adjacent but the low and high speed valves open. clear of the throttle shaft 5. Figure 4 is a diagrammatic view of the system A mushroom head metering Valve 22 cooperates in which the carburetor is embodied. with an annular taper valve seat 23 formed in Referring now more particularly to the charac 45 plunger 4 at the outer end thereof, and said ters of reference on the drawings, the carburetor valve 22 includes an actuating stem 24 which ex comprises a tubular body open at one end to tends through Said plunger in clearance relation atmosphere and provided at the other end with except at the inner end thereof where a close an attachment flange 2 adapted to connect With running fit is provided; such clearance providing the corresponding fange 3 of an engine manifold 50 a gas flow channel 25. A row of circumferen 4. A throttle shaft 5 extends diametrally through tially spaced ports 26 open through the plunger the body intermediate its ends, and Within Said 4 into channel 25 beyond the sleeve . The body the throttle Shaft carries an air flow control ports 2 a likewise are in communication with butterfly valve 6, mounted as hereinafter de channel 25. It should be noted that ports 2 a. scribed in detail, and which butterfly valve is 55 are of greater diameter than ports 26. 2,431,958 3 4. A compression spring C seats between the head when valves 9 and 22 are closed, by the follow of valve 22 and the plug 6 normally holding Said ing arrangement: valve 22 closed; valve 22 being the slow Speed An air feed duct 34 leads through body par valve of the carburetor. allel to its axis and connects between atmosphere The valve stem 24 terminates beyond the inner and the mixing chamber 9; there being a needle end of plunger 4 and is fitted with an enlarged valve 35 to control air flow through Said duct. head 27. A fiat segmental cam 28 is fixed on Another cylindrical housing 33 projects from throttle shaft 5 radially thereof, with the working body below housing 0, and is closed at its Outer edge of said cam eccentric to the shaft and riding end while its inner end is in communication with the head 2 on valve stem 24; said cam extending 10 a passage 3 leading to duct 34 inwardly of needle valve 35. across the shaft 5 on the side opposite the butter Fuel is fed into the housing 36 by a lateral fly valve 6, and being disposed so that the low conduit 38 leading from fitting 32 through the end of the cam engages head 27 when the butter closed outer end of said housing. Fuel under fly valve is closed. pressure in housing 36 is fed into passage 3 and The butterfly valve is rotatably supported on 15 duct 34 in controlled quantity through the medi the shaft 5 by a hanger H, and all motion of said um of a vacuum actuated, spring returned valve butterfly valve is imparted thereto by the can. unit 39. The valve unit 33 includes an adjust However at opposite ends of the back edge there ment, nut 40 which can be set to insure closing of the cam initially has some clearance from the of the valve against fuel pressure tending to butterfly valve. When the throttle shaft 5 is in 20 carburetor closing position, one end of the back open the same, When the Vacuum falls below edge of cam 28 engages an upstanding compres idling pressurë. sion spring S on butterfly valve 6 and urges the From the foregoing description it will be latter to closed position. (See Fig. 1.) From this readily seen that there has been prodiced such a 25 device as substantially fulfills the objects of the position the throttle valve can rotate to Some ex invention as set forth herein. tent in a clockwise direction without the other While this Specification sets forth in detail end of the back edge of the cam engaging the the present and preferred construction of the de butterfly valve on the opposite side of the shaft vice, still in practice. Such deviations from such 5. The advantage of this.independent movement detail may be resorted to as do not form a de of the cam relative to the butterfly valve will 30 parture from the spirit of the invention, as de hereinafter appear. fined by the appended claims. Gaseous fuel is supplied to the carburetor by a Having thus described the invention, the fol conduit 29 which leads from a tank 30 where the lowing is claimed as new and useful and upon fuel, preferably natural gas, is held under pres 35 which Letters Patent is desired: sure; there being a manually adjustable pressure 1. A carburetor comprising a body forming a regulator 3? interposed in conduit 29, and dis mixing chamber open at one end to atmosphere posed in the operator's compartment. The con and adapted to feed a fuel mixture from the duit 29 is connected to the carburetor by a fitting other end, a butterfly valve mounted for move 32 on and opening through the plug 6. 40 ment in Said chamber intermediate the ends Fuel, under regulated pressure, feeds from con: thereof, a fuel metering and delivery valve as duit 29 into the chamber 33 formed in sleeve sembly mounted in connection with the body between valve 22 and plug 6. When the throttle and in communication with the chamber between shaft 5 and the cam 28 are initially rotated in a said, other end thereof and the butterfly valve, clockwise direction from the closed position of 45 the butterfly valve being supported by a throttle Fig. 1, the cam moves independently of the but shaft, and a can mounted on the throttle-shaft terfly valve and begins to depress head 27 and operative-to-engage and progressively open said stem 24 causing an initial opening of valve 22. valve assembly upon rotation of said shaft to open Gasous fuel then first feeds into channel 25 and the butterfly valve. out of ports 26 into the mixing chamber 9. As 50 2. A carburetor comprising a body forming a this occurs before the butterfly valve 6 opens, the mixing chamber open at one end to atmosphere effect of an air choke is automatically obtained. and adapted to feed a fuel mixture from the other With continued clockwise rotation of the end, a butterfly valve mounted for movement in throttle shaft and cam, the valve 22 is fully Said chamber intermediate the ends thereof, a opened, as shown in Fig. 2, with maximum low fuel metering and delivery valve assembly mount speed fuel delivery through ports 26. ed in connection with the body and in communi Thereafter, with further clockwise rotation of cation with the chamber between said other end said shaft and cam, the head 27 abuts against the thereof and the butterfly valve, the butterfly valve adjacent end of plunger 4 and causes opening being Supported by a throttle shaft, and a cam of high speed valve 19; fuel then passing from mounted on the throttle shaft operative to en channel 25 through ports 2 a. into chamber 2, gage and progressively... open said valve assembly and thence about valve 9 into mixing chamber 9. upon rotation of said shaft to open the butterfly With opening of valves. 22 and 9, as above de Valve; Said, valve assembly being spring urged scribed, except at the initial opening of valve 22, toward closed position. the cam engages and there is an accompanying 65 3. A carburetor comprising a body forming a progressive opening of butterfly valve 6 to provide mixing chamber open at one end to atmosphere access of air in proportion to fuel increase; fuel and adapted to feed a fuel mixture from the delivery being properly regulated to butterfly other end, a, butterfly valve mounted for nove valve position by axial adjustment of sleeve ment in Said chamber intermediate the ends which carries the valve assembly. 70 thereof, a fuel metering and delivery valve as The springs 8 and C return the valves to sembly mounted in connection with the body and closed position in inverse progressive Order to in communication With the chamber between said that above described, when the throttle shaft other end thereof, and the butterfly valve, and 5 is rotated counter-clockwise. means. Operative to first open said valve assembly Idling fuel mixture is delivered to chamber 9, 75 slightly and to a predetermined extent independ 2,431,958 5 6 ently of the butterfly valve, and to then Open Said closed upon movement of the plunger toward the valve assembly and butterfly valve together and mixing chamber, spring means normally urging progressively. the plunger to valve closing position, said plunger 4. A carburetor comprising a body forming a having ports therethrough on opposite sides of mixing chamber open at one end to atmosphere said annular valve, another valve arranged to and adapted to feed a fuel mixture from the close the end of the plunger opposite the mix other end, a butterfly valve mounted for move ing chamber, said other valve including a valve ment in said chamber intermediate the ends stem extending through the plunger and termi thereof, a fuel metering and delivery valve as nating beyond the inner end of the latter, there sembly mounted in connection with the body 0 being a fuel flow clearance in the plunger from and in communication with the chamber between said other valve to said ports, other Spring means said other end thereof and the butterfly valve, normally urging said other valve to closed posi and means operative to first Open Said Valve as tion, and means operative to first engage and sembly slightly and to a predetermined extent move said stem to open said other valve, and to independently of the butterfly valve, and to then 15 then engage and move the plunger to open said open said waive assembly and butterfly valve to annular valve. gether and progressively; the butterfly valve be 9. A carburetor as in claim 8 in Which said ing rotatably mounted on a throttle shaft ex Spring means Cooperating With the plunger, and tending into the mixing chamber, and said means other spring means cooperating With said other including a cam fixed on said shaft, Said can 20 valve, comprise compression Springs, one within upon rotation of the shaft in one direction being the other, engaged between the closed Outer end arranged to first engage and partially open the of the housing and adjacent portions of the valve assembly and to then engage and Open both plunger and other valve. the valve assembly and butterfly valve. i0. A carburetor Comprising a body forming a 5. A carburetor comprising a body forming a 25 mixing chamber open at one end to atmosphere mixing chamber open at one end to atmosphere and adapted to feed a fuel mixture from the and adapted to feed a fuel mixture from the ether end, a butterfly valve mounted for move Cther end, a butterfly valve mounted for move Hent in Said chamber intermediate the ends ment in Said chamber intermediate the ends thereof, a cylindrical housing projecting laterally thereof, a fuel metering and delivery valve as 30 froin the body, the housing being closed at its sembly mounted in connection with the body and cuter end and in communication at its inner end in communication with the chamber betWeen said With the mixing chamber between said other end other end thereof and the butterfly valve, Said thereof and the butterfly valve, a fuel feed con waive assembly including a low speed Valve and duit connected into the hOUsing adjacent its outer a high speed valve, and means to Open the butter 35 end, a tubular plunger slidable in the housing, fly valve and said valve assembly together and an annular valve between the housing and progressively; the low speed valve opening first linger closed upon movement of the plunger followed by the Cpening of the high speed valve. toward the mixing chamber, spring means nor 6. A carburetor as in claim 5 in which said mally urging the plunger to valve closing posi valve assembly includes a stem depressible to 40 tion, the butterfly valve being mounted on a open the low speed valve, and a plunger depres transverse throttle shaft in the body, and a cam Sible to open the high Speed valve; Said means mounted on Said shaft, said can being arranged being operative to depress the stem, and the stem to function upon rotation of the shaft to first after predetermined depression thereof, engag cause movement of the Stein and Opening of said ing and depressing the plunger. other valve, and then cause movement of the 7. A carburetor comprising a body forming a plunger and opening of said annular valve. mixture chamber open at Cne end to atmsophere 1. A carburetor as in claim 10 in which both and adapted to feed a fuel mixture from the the plunger and stem project into the mixing other end, a butterfly valve mounted for move Chamber to adjacent but short of the throttle ment, in said chamber intermediate the ends 50 shaft, the stem projecting slightly further than thereof, a cylindrical housing projecting laterally the plunger, and a head. On the Sten beyond the from the body, the housing being closed at its plunger; the cam riding said head, and the head Outer end and in Connunication at its inner end engaging the plunger after predetermined move with the mixing chamber between said Cther end ment thereof by the cam. thereof and the butterfly valve, a fuel feed con 55 12. A carburetor as in claim 10 in which the duit connected into the housing adjacent its Outer butterfly valve is rotatable on the throttle shaft; end, a fuel metering and delivery valve assembly Said Cam being operative to first cause movement slidably mounted in the housing and closing to of the stem and partial opening of said other ward the mixing chamber, Spring means normal Valve independent of the butterfly valve, and to ly urging the valve assembly to closed position, 60 then engage the butterfly valve and thereafter and means to open the butterfly valve and said cause opening thereof progressively with con valve assembly together and progressively. tinued opening of said other valve and subsequent 8. A carburetor comprising a body forming a Opening of Said annular valve. mixing chamber Open at One end to atmosphere 13. A carburetor comprising a body forming a and adapted to feed a fuel mixture from the other 65 mixing chamber open at one end to atmosphere end, a butterfly valve mounted for movement in and adapted to feed a fuel mixture from the said chamber intermediate the ends thereof, a other end, a, butterfly valve normally closing the cylindrical housing projecting laterally from the paSSageWay through the body, a normally closed body, the housing being closed at its Outer end gas valve connected with the body between said and in communication at its inner end with the 70 other end thereof and the butterfly valve, such mixing chamber between said other end thereof gas Valve including a valve stem projecting into and the butterfly valve, a fuel feed conduit con the body, a can mounted for rotation within the nected into the housing adjacent its outer end, body, such cam being engageable with said stem a tubular plunger slidable in the housing, an an to Operate Said gas Valve and said can being also nular valve between the housing and plunger 75 engageable with the butterfly valve to move it 348,958. 7 8 from closed to open position, and means to feed 16...A carburetor as in claim 15, including fuel to the gas valve. . . ?? means to progressively move the last named 14. A carburetor as in claim 13% in Which the valve from said partially opened position to full movement of the can first engages and moves open position synchronously with the opening of the stem to partially open the gas valve, and 5 the butterfly valve. thereafter the cam engages and opens the butter LEO E. OLIVER, fly valve while continuing to move the stem to RAY CARSON, SR. further open the gas valve. 15. A carburetor comprising a body forming a REFERENCES CITED mixture chamber open at one end to atmosphere 16 The following references are of record in the and adapted to discharge a fuel mixture, from file of this patent: the other end to an engine, a butterfly valve nor mally closing the passage through the body, a UNITED STATES PATENTS Source of fuel supply, two fuel feed passages lead Number Name Date ing from the fuel Supply Source tó Said other end 5 2,027,492 Snodgrass ------Jan. 14, 1936 of the chamber and to the same Side-of-the-butter 2,324,392. Hinchman ------July 13, 1943 fly valve, a valve in each passage, one passage 2,319,971 Bodine ------May 25, 1943 constituting a fuel feed för th? ?ngine when 2,106,903 Tonkin ------Feb. 1, 1938 idling, and the other constituting a main fuel 2,073,298 Ensign ------Mar. 9, 1937 feed to the engine, and means operable to par 20 2,004;403 i Davisson et al. ----- June 11, 1935 tially open the valve in the main fuel feed pas sage without opening the butterfly valve where FOREIGN PATENTS by fuel may flow from the main fuel supply to Nü?mber. Country Date the engine without atmospheric air being mixed 380,865 Italy -- .??-? ???? --?? ? - - - - - June 8, 1940 there with.