US2279626A - Carburetor - Google Patents

Description

April 14 1942 G. v. LEHEW 2,279,626`

CARBURETOR V Filed Oct. 2, 1939 3 Sheets-.Sheet l 132 j 125 2 104m 5g 105 119 :umn mm@ 06 58 '119V 12H-'l' |5595:

IIIII'IIIIIIIIII j "Ilm: 1 -2 L 5 mmummmun 6760396 ,yeew

INVENTOR TTORNEYS April 14 1942- G. v. LEHEw 2 2 i 2,279,626

l CARBURETOR Filed Oct. 2, 1939 3 Sheets-Sheet 2 ATTOR N EYS April 14, 1942 G. v. LEI-IEW 2,279,626

GARBURETOR Filed Oct. 2, 1939 .3 Sheets-Sheefrl 3 6719059@ Fi/zaza ATTO RN EYS Patented Apr. 14, 1942 UNTED STATES 2,279,626 CARBUnErron George V. Lehew, Belle Vernon, Pa.

Application October 2, 1939-,- Serial No. 297,615

1.Claim.` (Cl. 261-41) This invention relates to carburetors and has for its prime object to improve generally upon such devices for use in connection with a supply of vaporized fuel for general use but more particularly for use in connection with internal combustion engines installed on motor vehicles and the like. t

A particular object is to provide a more practical and efficient construction and arrangement of parts to attain an ideally proportioned and balanced mixture of air and gas in the operation of an internal combustion engine or other utility operating under the agency of 'vaporized fuel combustion under all load conditions and speeds in operation,

Another object is to simplify the structure by the minimization of separate parts and inthe assemblage of the parts in separate unitary and detachable sections so as to gain ready 'access to the respective parts for the necessary adjustment, repair and renewal thereof, asoccasion may require, and to minimize thecost of production aswell as the time required for the assembling of the structure.

With the foregoing and other objects andadvantages to be attained, as will hereinafter more fully appear, the invention consists in the novel general structure and in the particular parts and combinations and arrangements of parts thereof "-.nas hereinafter described and set forth in the appended claim, reference being had to the accompanying drawings illustrating a practical adaptation of the invention, in which,

Figure 1 is a side elevation of the complete carburetor assembly;

Figure 2 is a horizontal section, on an enlarged scale, taken on the line 2-2 of Figure l;

Figure 3 is a vertical section taken on the line 3-3 of Figure 2;

Figure 4 is a horizontal section on the line 4 4 of Figure 3;

Figure 5 is a view of the complete carburetor assembly partly in end elevation and partly in section on the line 5-5 of Figure l;

Figure 6 is a verticalsection on the line 6,-6 of Figure 3;

Figure '7 is a fragmentary view, in section, on the line I-'I of Figure 6; and

Figure 8 is a fragmentary view, in inverted plan, of the auxiliary air inlet extension of the main suction column of the carburetor, looking in the direction of the arrows on the line 8 8.v of Figure 3 and illustrating details of the hinged,

mounting of the yoke member carryingthe ad-v justing screw for the controlling spring for the valve in said auxiliary air inlet extension.

Referringnow to the drawings in detail,v the numeral I designates a tubular -tting constitutingy the main support for the carburetor assembly as well-asthe base member of a vertical mainl suction column, the' upperKV member'V of which is detachablysecured thereto as Will be later'more fully described. This base member I is anged atv its lower end to provide oppositely disposedlugs- 2 which are obviously apertured, as at 3, for the reception of conventional securing bolts or screws by means of which the` base member I is communicably attached to the inlet-portion of the manifold which supplies the combustible mixture to the engine or other utility to be operated. v

The base member! is provided near its upper end with a lateral auxiliary outside air inlet opening 4 which is surrounded by a tubular eX- tension 5 provided with a manually controlledv valve 610i the rotatable disk or plate type for? varying the intake capacity of said extension 5,l the ,pintle 1 of said valve being provided at one end thereof, outside the tubular extension 5, with a crank arm 8, which, in the installation of the carburetor, is connected by an operating rod (not shown) in the usual manner to an operating knob or lever located on the instrument board of the Vehicle or on the steering post or column Within convenient reach of the driver.

The outer end portion of the tubular extension 5- is anged to provide diametrically opposed lugs 9, said lugs 9 being apertured and screwthreaded for the reception of screws Ill` forthe' attachment thereto of a correspondingly aperturedv ange or lug portion `of an outer tubular extension II, the bore of which is'alined communicably with that of said tubular extension 5. The tubular extension I I is truncated or out olf obliquely to receive a correspondingly truncated semi-cylindricalcomplemental member I2 having a marginally flanged portion I3 which` itisf normally held under the inuence of a spring element I8 and the intermediate lever and link connections to be now described.

As shown, the spring element I8 is located in a barrel I9 which is slidably mounted for longitudinal reciprocation inan open-ended bore provided therefor in a block or lug 2| extending downwardly from the tubular extension I I. One end portion of the barrel I9 which projects beyond the block or lug 2| is closed and provided With a lateral extension 22 which is apertured and screw-threaded for the reception of the correspondingly threaded end portion of a rod 23, said rod being adjustable longitudinally in relation to the extension 22 of the barrel I9 and releasably fastened in such adjustment by a jam nut 24 provided on the projected end portion of the rod and tightened against the outer face of the extension 22. The rod 23 is slidable freely through a bore provided therefor in the lug 2| of the tubular extension II just above the bore 20, and at its end opposite to that which is attached to the extension 22 of the barrel I9 the rod is pivotally attached, as at 25, to the lower end of an oscillatory lever 26% which is pivotally mounted, as at 21, on a bracket extension 28 of said complemental member I2. In this connection, it is noted that limited elongation of the aperture in the lever 26 is provided for suicient movement of the pivot pin or bolt in the line of the longitudinal axis of the lever to compensate for the arcuate movement of the lever end portion during longitudinal reciprocation of the rod 23, The upper end portion of the lever 26 is connected by a link bar 29 to a lug 30 provided on the outer face of the valve member I6, said bar 29, as shown, having one end portion turned at a right angle to the main body portion thereof and inserted in an aperture provided therefor in the lever 26 where it is held in place by a conventional Cotter pin, as at 3|, the opposite end portion of the bar being similarly formed and secured in an aperture portion of the lug 30, as at 32. By the aforesaid lever and link connection between the valve member I6 and barrel I9, said elements I6 and I9 are movable theone by and with the other.

The spring element |8 is inserted in the bore of the barrel I9 with its inner end abutting the bottom. of the bore, the opposite endv portion of said spring element extending some distance beyond the open end of the barrel I9 and abutting a marginally flanged circular stop plate 33 which is swiveled axially on the inner end of a supporting and adjusting screw 34 which works in a correspondingly threaded opening in a yoke member 35, the leg portions 357 of which are pivotally mounted on diametrically opposed trunnions 36 provided on opposite sides of the bored portion 20 of the lug 2| on the air intake extension I. Normally, the yoke is in a horizontal position with its leg portions 35 parallel with the longitudinal axis of the bore 20 so that the screw 34 is in axial alinement with the spring element I8 and. may be adjusted longitudinally on the yoke member so as to vary the tension of the spring element, yet when it is necessary or desirable to remove and replace the spring element and in the renewal thereof in case of repairs, the screw 34 can be turned in the yoke 35 to move it in the direction to withdraw the stop plate 33 from the bore 20 of the lug 2| and to a distance beyond the end thereof sufficient to permit the yoke to be swung downwardly on the trunnions 35 and out of the Way so that access may be had for the removal and replacement of the spring element I8 without having to dismantle the air inlet extension I with relation to the lateral tubular extension 5 of the base member of the suction column or disconnecting the parts of the'lever and. link connection between V"inturned arm 39 (see Figure 6) which engages the end of a stop member 40 in the closed position of the valve, said stop member, as shown, comprising a screw stud mounted on a supporting `lug ,'4I provided on an adjacent portion of the base member I. By adjusting the stop member 40 longitudinally in the lug 4I its inner end may be variably located to stop the arm 39 in different angular positions relative to the axis of the pintle 38 to vary the degree to which the throttle valve 31 is positioned with closing effect in the bore of' the base member between a fully closed and partially opened position. 'Ihe opposite end portion of the pintle 38 of the throttle valve 31 is provided with a bellcrank 42, one arm 43 of which is connected by an operating rod (not'shown) in a conventional manner to an accelerator pedal or a hand lever or other suitable manually operable element, or to both, in accordance with the common practice in the control of carburetors on motor vehicles and the like. 'Ihe opposite arm 44 of the bellcrank 42 is utilized in the operation of idling speedl control means provided in the carburetor assembly in accordance with the present invention, as will be later more fully described.

, The tubular base member I, which, as hereinbefore described, constitutes a support for the entire superstructure o-f the carburetor as well as a base member for the main suction column, is flanged at its upper end to provide a diametrically opposed pair of lugs 45 which are apertured for the reception of securing screws 46 by which a flanged coupling member 41 is attached to the base member I, said coupling member 41 having a central opening 48 therein, of a diameter substantially the sameas the bore of the base member I and registering communicably therewith, said opening 48 being counterbored from the top of the coupling member 41 and having the lower end portion of an open-ended tubular cylinder 49 fitted tightly and supportedly therein, the bore of said cylindrical member being of the same diameter as that of the opening 48 in the coupling member 41 and the bore of the base member I. This cylindrical member 49 extends through the bottom of a rectangular outer carburetor shell 5D and through the bottom of an inner rectangular reservoir shell 5| and terminates at its upper end short of the top wall of the inner shell for a purpose to be later more fully described.

The flat bottom 50 of the outer shell 50 which provides the main carbureting chamber of the device, is riveted, as at 52, or otherwise secured with leaktight effect to the marginally anged portion of the coupling member 41 the top face vof which is flat throughout the extent thereof.

The inner shell 5|, which is of considerably smaller dimensions in length, breadth and height than 'the outer shell 50, is supported within the outer shell with the bottom, top, side and end Walls of the two shells spaced apart throughout marginal fit between the bottoms of the inner' and-outer shells and the vertical leg portions 53b of--the-bafes'extendingand tting likewise tightly between the sidefwalls of `the inner and outershells; The upper ends ofthe vertical portions 53hof` the baille partitions terminate in a plane short of that of the-'top -of the inner shell but above-the level of the liquid in the outer. shell,

and-,- as shown, the only openings in said baillepartitions establishing communication between the spaces therebetween and between theendmost partitions and end wal-lsof the outer shell are provided by the arcuate cutaway portions 54 at the two opposite-lower corners of the partitions l(seeY Figure 6). To hold the baffle partitions in place they are obviously soldered, Welded or`r otherwise secured to the adjacent wall portionsrof the inner and outer shells |3Iand 5|, re-

spectively. By this provision and arrangement of the baffle partitions backward and forward movement of the liquid fuel in the outer shell 56 and the splashing thereof is practically prevented yetrthe lower corner openings in the partitions aord ample intercommunication to normally maintain the liquid in the several compartments at the same level.

The innershell 5| is also provided with transverse baffle partitions 55, only two of which be-` ing provided in the structure shown,` inasmuch as: the inner shell is-of lesser length than the outer shell. However, as far as the present invention is concerned, the number of the bailies53 and 55 may be obviously varied as is found Anecessaryl or desirable. As shown, the upper ends of the bale 55 which are of rectangular form and extend from side wall to side wall of the inner shell 5|, terminate in the same plane as the upper ends of the vertical portions 5db of the balles 53. The baliies 55 are also provided with lower corner openings 56 for the establishment of liquid flow communication therebetween and between them and the end walls of the inner shell 5`|fsimilarly as the openings 5d' are provided in the outer baiiles 53.

The inner shell 5| constitutes the working reserve supply reservoir for the liquid fuel which is deliveredrtherefrom into the surrounding `lower part of the outer shell 59 through an outlet opening 5l provided in the bottom of the inner shell 5| adjacent one end thereof, preferably the; rear end with relation to the longitudinal positioning of-.the carburetor body in the direction of travel of the motor vehicle, which is the preferred and more practical arrangement of the carburetor shells 56 and 5| with relation to the air intake provisionto be later more fully described. However., while this location of the opening 5l is of material advantage in the operation of the carburetor it is not absolutely essential to thev successful operationthereof.

The liquid fuel is delivered. into the inner shell 5|'from a pipe 5B leading from a main supply tank (not shown) in the customary manner. As shown, the discharge end of the pipe 58 is attached by a gland nut 59 to the outer end of a nipple member Gil which is extended through a tubular strut member 6| located between the adjacentend' Wallportions of the outer and` inner shells 51T and 5l, said nipple member 6u hav- 75 ingga headed inner; end .portion 62 and.l being; provided-on itsi 'externally screw-threadedprof jecting: outer-'end portion.- with. a vjamv nut: 63 which isztightenedagainstj theadjacent .rend wall portion ofthe-v outerA shell :56 witha sealingwashf er" 64i interposedy therebetween.' The innert lend portion of f the-.'bore--;65 r ofl .theA nipple? member66 t isf counterbored'for-thei reception' of agreciproeca-toryy valves. element v66;;.the mainbody portion. of"which is" formed withtlongitudina'l ribs for guiding theelement in theenlargementof'fthe bore .65 -and-l permittingfree; passageA ofk the liquid fuel therebetween. This-valve element .663 is -providedfatits innereri-d with afred'uced axial exV tens-ion,- 611 Which-:is tapered: atits end. to -seat againstthe shoulder at-"the-b'ase'of thev enlarge-r ment of the bore: 65.-so asto.shut-'offfthe Yflow through'the -.bore^when,.the-.va1ve is in itsy closed position, in which position it is:.held under: the` influencer of fa floatelement 68 when the liquid in the shell. 5-l-is` at a predetermined maximum-l level; As-shown, the vfloat element. 68 comprises a hollow sheet metal shell: of'. generally rectangular' form but with rounded corners, which is attached toand' carried byv an. angular lever member 69-'which -is hingedly mounted, as at 10, on the horizontal armoflasupporting bracket l'l, the vertical arm of which is apertured and fitted on the nipple member 6U-and is-clamped ,between the-head- 62 of said nipplernember. and the-f adjacent end wall portion of the shell 5|-, The upper-end' portion 'l2 ofthe lever member 69: abuts a rreduced endiextension` of the valve element 66- so-as-.toholdzsaidvalve element in ,its closed-position when the iioat element 68' is lifted as the liquid reaches its maximum level in theshell 5| Yandi-restricting the opening movement of the valve element when the liquidfallsf below suchl level, that isy to say, the movement of thenportion 'l2-lof the lever memberv 6B awayfrom the nipple-member 66 Ais limited becausefioat element Sli-towards theiend of the horizontal. armof the supporting :bracket 1|. l v The provision ofnthef inner shell 5| as a working reserve supply reservoir for. the liquid fuel, located as itis within-the'. carbureting chamber affordedbyfthe-outer shell 56 and containing thefloat element which; controls the valveelement 6|-of the pipe connection between the carburetorv and the-main liquid fuel supply tank, is animportant feature: ofthe presentV invention, in Vthat turbulence of` the liquid: in the inner shell 5| is practically nil or at least greatly minimized'- as compared to the turbulence of the liquid in the outer shell 5|) during the operation ofthe'- carburetor. That is to say, with the float ele# ment 68 located as it iswithin the shell 5| ,there is no appreciable-fluttering of said element tending to cause chattering or intermittenty opening` and closing of the valve element 66' inquick succession while the liquid in the shell 5|l is ator` near its maximum Ievel as would occur ifthe float were in thebodyOf-iiquid in the outer sneu 5G Where the aeration ofthe-liquid is occurring in the operation of the carburetor as will-be presently more fully described. l

At opposite longitudinal sides of the outer shell 56 are air ducts 13,- said ducts, as shown moreclearlyinv Figures 5 and 6, comprising attened tubes-which are closed at one end' terminatingin proximity toone end wall. of theshell 50S` (the frontend in an installationon a/motor vehicle), the opposite endsof thetubesrbeingiopen #andi` it is noted that, in accordance with the operating principle of the present invention, the closed end portions of theducts .13 are contiguous to the bottom 50 of the shell 50 and the adjacent end wall of the shell, which, as just above noted with reference to the installation of the carburetor on a motor vehicle, is the front end wall in relation to the general direction of forward travel of the vehicle, the vertically widened open end portions of the ducts being at an elevation a substantial distance above the maximum level of the liquid in the shell 50, but the portions of the ducts at the bottoms of said offset upper portions are belowthe liquid level so that, when the shell 50 is substantially horizontal, as it normally is, the major lower portions of the ducts next adjacent the rear end wall of the-shell are immersed to a considerable depth in the liquid fuel, yet the parts `of the upper portions of the ducts next adjacent the open `ends thereof are above the body of liquid (see Figure 3). Hence, it is assured that the apertured portions of the ducts 13 are always immersed, but when the vehicle is traveling upgrade at a comparatively steep incline, it is further assured that the several minute apertures 14 nearest the open end of the ducts are immersed still deeper in the body of the liquid fuel, This is of material advantage in producing the proper combustible mixture when an engine is laboring in the upgrade pull with a heavy load onthe vehicle. 'I'he series of apertures 14, as shown, are located in the inner side walls of the ducts 13 adjacent the bottoms of the ducts, or, obviously, they may be located directly in the bottoms, but in any case, it is essential that they be at least in close proximity to the bottoms of the ducts, so that upon starting operation of the carburetor, the ducts are quickly freed of any liquid which may have accumulated therein while the carburetor was not in use.

At the end of the outer shell 50, where the ducts 13 are open to communication through the wall thereof, is an air intake manifold casing 15, which,.as shown, is formed, as a cup, from sheet metal and detachably secured to the end wall of the shell 50 by studs 16 which are formed with base flanges at their inner ends and riveted to the wall of the shell as at 11, said studs being projected through apertures provided therefor in the manifold casing 15 and screw-threaded for the reception of securing nuts 18 which are tightened againstthe casing so as to clamp it with its marginal portions tightly against the adjacent outer face portion of the end wall of the shell 50. Anf object in locating the open ends of the ducts 13 as high above the maximum liquid level in the shell 50 as shown and described is to prevent flow of the liquid from the shell 50 into said casing 15, at all times, whether the shell .5U is in a horizontal position during substantially level travel or inclined as when the motor vehicle `is traveling upgrade.

- The air/intake manifold casing 15 is provided with an inlet opening 19 in the upper portion of its end wall which is marginally flanged, as at 80, for the reception and support of a cylindrical cupped member 8| having an opening in its end wall which is flanged, as at 82, in which opening is fitted an'open-ended tube 83, the lower portion of which projects into the inlet opening 19 of the air intake manifold casing 15. Preferably, as shown, the tube 83 is truncated or cut off obliquely, as at 84, and a leaf valve 85, hinged as at 86, to the upper portion of the tube 83, is provided for controlling the passage of the air through the tube, said valve being yieldably held in closed position by a spring element 81 and opening todifferent degrees as the suction varies within the carburetor during the operation thereof and accordingly admits more or less air into the manifold casing 15 from the tube 83.

The inner shell 5| is provided in its longitudinal side walls and transverse end walls with a multiplicity of minute apertures 88 arranged in parallel horizontal rows near the top of the shell, through which communication is established between the outer shell 50 and the inner shell 5| for the passage of mixed air and vaporized liquid from the upper space in the outer shell 50 into the upper portion of the inner shell 5|, whence it passes out of the shell 5| through the suction column, the upper portion of which comprises the tube 49 whose upper end terminates some distance below the top of the shell 5| but a considerable distance above the maximum level of the liquid fuel in said shell.

In the operation of the carburetor as thus far described, the throttle Valve 31 is opened in the usual way when the engine is started, at which time the auxiliary air inlet valve 6, controlling the lateral air inlet opening 4 of the tubular base member of the suction column, may be closed or set in a partially open position, whereupon the suction created in the alined and joined column members and 49 causes air to be drawn into the intake manifold casing 15 and into the downwardly inclined ducts 13, from which it is distributed through the apertures 14 of the ducts into the body of liquid fuel in the outer shell 53. The air thus distributed travels upwardly through the body of liquid, creating 50i turbulence therein and carrying with it globules of the liquid into the upper space in the shell 50, whence the admixed air and vapor thus created is passed through the minute aperture 88 in the upperA wall portions of the inner shell 5|, thereby 551 further breaking up the minute globules and effecting a more thorough mixture of air and vapor which is drawn out of the upper portion of the inner shell 5| downwardly through the suction column and thence into the fuel intake manifold of the internal combustion engine or utility in which the combustible mixture is used. In this connection, it is here noted that, after operation of the engine begins, the auxiliary air inlet valve 6 is opened fully so that the air taken into the suction column through the lateral opening 4 is entirely under the control of the valve I8 which is normally spring-urged to closed position but opens to a degree according to the power of the suction created in the column under the different speeds and load conditions to which the carburetor is subjected in the operation of the engine.

While the carburetor as thus far described operates with high efciency 'and' ideal advantage in producing a properly proportioned combustible emggeze'- rnictureV in theL regular operation ofthe' engine" at'- diierent speeds and underv various load con-A ditor'is;A special provision isl made for operating' thelengine" at idling speedY and also for facilitating? the starting ofthe engine under certain conditionslwhere the proper combustible fuelr'riiX- ture" is' not immediately attainable-Z. This isjac` conflplished by providing a by-pass for the liquid fuelfrom theA outer shell 50 with means-forl niixaproportionate' amountA of air withlthe' passed liquid and conducting the mixture int'o the lower part of the suction column below the' throttle valve 31". As shown, a unitary attachni'ent" including a block 89 ismountedV on one of the longitudinal' side-walls'ofthe out'er'shellvr 59, said block having a transverse'horiontal'bore BIinfitslower portion which communicates with theN interior of the' shellV 59 througha' portV 9i. 'Ihel outer endl portion ofthe bore 9`9is counter-j b'or'edand screw-threaded toreceive" the corre# spondingly threadedr enlargement 92 oft a flowc'oritifollin'g plug 93 whosel inner endpertionts snugly in the non-threaded portion ofV the bore 90 and is provided with an axial bore 94 ini-ite inner end, said bore 94f` communicating with a transverse' bore 9:5'Y in'l the plug tl'irough a-Y ref' striction 99 at the base of 4said bore 'ell- The portion` ofthe plug 93l in the region where the transverse bore 95 occursis reduced inoutside diameter so as to provide' anannulargspace between the plug and? the adj'aeent" wall portion of the bore 94 for establishing communication betweenf saidv transversel bore 95 and a' vertical bore 9'! inthe block 89, said'b'bre v91 being-en- BY kWorking in the bore enlargement 98 is a` needle valve element 99, the lower end portion of which is' tapered with considerable elongation; as`at I09,- so as to enter the bore portion 9T ofv smaller diameter and-seatagainst the shoulder ati the upper'- end thereof;A A- spring# ml,- coiledI about the needle valve' fbetween; a collar |132 shown; comprises a' separate piece which is "aper` tured to t on areduced portion' ofl the valve' stein', which latter is screwg-threadedfor the reception'of alsecuringnut I95-b`y which said arm IIl'4"is"held` tight againstthe shoulder at the'loase` ofsa'id reduced portion'of the stern'. Tothe outer en'dof the arm |04' is pivotally attached, as atl IUS; an operatingrod IOI; which depends Ytherefioinirf a general vertical direction, but the, lower edp'ortion" IGS of the rod beingI oifsetE inwardly towards thebasemember I of'v the suction column andtted slidably in asw'ivtel-loloclr` Illlmoiinted I' on'T-thar'rn 4450i the hereinbefore described bell! crnk'az'wmch is ered kon the' pinne s'sfof the throttle" valve' s1; y

|081' of theirod 101 is prvid'dwith an annular enlargement IIU which is `engaged'on its: under-` Siae" bythe SWVl blocklvg When' the throttle valve' 3T isclosed; whereby= the rodiTf is i lifted aidtheattached needle valve element 99 is accordingly raised from its seated engagement at the" upper end of-the smaller vertical bore 9i in the block 89. However, Vwhen thethrottle valve 3'! is opened and the arm M of the bellcrank 42 accordingly lowered, the swivel block |09 on the arm 44 moves away from the shoulder III) of the rod IIII and the spring II moves the 'f Said inwardly offsetI portionv inth'eupper end poruonf or tue,sma11.bdre9if, therebyy closing' said Bore and-,keeping itfc sediA during the regular operation of Athe"'car-Iiure" fr# as first herein described.

tion of said' valve', the cam IIB-is setwith high peripheral portion"- substantiallyv in horizon-y taly alin'einent wi'thl-theaxis`v of the pintlei 'F and`7 out ofcontact with the armV II'T/jo'f said rclriiigj leve'rfat'which time the arm IISfis in ,ei'g'ag'ei-y ment with the concentricl lower portion of" thev 'l cam' member' andthebifurcated end *portion I`I`2f isin a neutral position-Vin spacedrelation tkbfoth' of' the annular vshoulders IID and IIf'l offtheop rf atingredA Il 'l, thereby permitting operation**ofA said rod IUT! Ainde'1;en'de`ntly of saidl rocking lever. However,v when the 4valve'ii is moved tofcl'sed or partially closed position, thebifurcated endpor'r tion I`I 2""ofl said rockingl'ever 'IISjengagesthe 11n-' derside" of the upper shoulder vIH ofthe rod and; thereby; lifts the rod and the attached needleI valve-S9 soasto unseatthelatterffrom the'upper end'of the lowerb'ore 91'in the block 89:

' vWheny the needle vali/e933 is unseated'tle'liduifdfuel inthe mainA carburetor shell- 5!!Y iiows vinto: the larger" bore' Siti-'ofl the'l block-'- 89h through/trieI controls 'the flow through the smaller bore SIihti' the larger bore 98, it being here noted thatfinterr changeable plugs 93 may be madewith dilerent sizedy axial and transverse bores andsubstituted one yfor another when it is` desired to owl"'a"1 greater or lesser amountof yliquid fuelfrom` the main carburetor shell 5finto the larger bore-98? of the block 89, So', too, instead ofusing the plugsof the type illustrated, an adjustable neefdlefv valve or the like'grnay be obviously provided'an'd substituted for controlling the liquid iiow between y l the main carburetor shellv 59 and the'loore L98 ofy the 4block 89. This substitution beingfobviouis',

no detailed" illustration or further description'A thereof is deemed necessary.

The block 8&9 is provided with a vertical bore i II-'Iin parallel relation to the alined bores 91 and 98, the upper end portion ofA said bore `I I'Vbeing enlarged, asv at II8, and screw-threaded for the reception of a correspondinglyv threaded 'plug II'9,- said plug l I9 having a needlevalve extension' I2!) at its inner end which is adjusted to vary the' degree of opening in the'b'ore'r I IInat the base oi"` the enlargement IISl thereof by the turning-pf'1 the plug` I-I9and thereby moving it inwardlyori outwardly in the enlargement H8" of the bore;r

i asthe' case may be. To prevent ac'cids'entaldisf-L placementv of' the plug I"I9, a spring H9', con? stantly under compression, is coiled alooutthek plug betweenv its* headdouter end portion and the adjacentftopface portion ofltheblo'ck` 89,. A

lateral airy inletportfll'V is provided'in the lloloclif' 89 in communication with the enlargement IAI8 of said bore II'I. The upper portion of the `bore II'I is communicably connected to the bore 98 by a lateral duct |22 which inclines ldownwardly from said bore I I1 and intersects the parallel verofthe needle valve element 99 and above the level of the liquid which enters the bore 98, it being here noted that the normal maximum level of the liquid fuel in the borel 98 is substantially the same as that of the liquid in the shells 50 and This duct |22, as shown, is provided by boring the block 89 diagonally from the outsideY closed land the engine is running at idling speed,-

the suction created in the base member in turn creates suctionin the pipe |25, and, obviously, inV

the bore ||1 and transverse passageway |22 between said bore 1 and the alined parallel bores 91 and 98, the liquid fuel in the bore k98 being drawn through the transverse passageway' |22 into the bore |1. At the same time air is drawn into thebore |1 through the intake port- |2|,

thereby producing a combustible mixture `of ample richness for the operation of the engine at idling speed, such mixture being drawn into the base member below the closed throttle valve 31.. Obviously, the proper balance in the combustible mixture for idling operation of theV engine is attained by providing a plug member 93 with properly proportioned axial and transverse passageways therein and by accordingly setting the needle valve point |20,v which controls the air supply to the mixing chamber which isalforded by the bore ||1 in the block 89 as hereinbefore described. n

In order to gain access to the interior of the shells-59 and 5|, the outer shell is provided with aconventional cover plate |21, which is secured at its marginal portions by screws |28 and with leaktight fit to inturned ilanges |29 provided therefor on the longitudinal side and transverse end walls of the shell and lsurrounding the top opening of the shell. The inner shell 5| `is provided with a similar cover plate |30. So, too, in order to prevent damage to the carburetor should aback lre occur, the cover plate |21 of the outershell 50 is provided with an outwardly flanged relief opening 3|. This relief opening is normally closed by a yieldable cover plate |32 provided with a sealing gasket |32', which marginally engages the flanged portion of the open-1 ing Y |3| when the cover plate |32 is yieldably held in its closed position by a spring element |33. As shown, the cover plate 32 is provided with an axial stem |34 which is slidable in an apertured guide member |35 extending diametrically Yacross the relief opening |3|, said stem havingthe head |36 at its lower end, between which and the guide member |35 thespring |33 is interposed and under constant compression so as to keep the cover plate |32 closed during normal operation of the carburetor.

By the provision of a carburetor of the general characteristic construction-and arrangement herein illustrated and described, a properly bal-V um bore 9a just below the annular Shomder |02.

anced mixture of air and vaporized liquid fuel is obtained under all operating speeds and load conditions to which an internal combustion engine is subjected, particularly one installed on a motor vehicle, and the carburetor operating to ideal advantage in the upgrade travel of the vehicle. In this connection it is also noted that by having the peculiarly formed air intakeducts located adjacent the longitudinal side walls of the outer shell 5D of the carburetor, the vehicle may also tilt laterally at a considerable angle without detracting appreciably from the normal operation of the carburetor as when the vehicle is traveling in the general forward direction, either on a level roadway or upgrade as hereinbefore described.

, While the construction and arrangement'herein illustrated land described embodies a practical adaptation of the invention, it is obvious that considerable modification may be made in the general structure as well as inthe particular parts thereof without departing from the spirit of the invention as defined in the appended claim. n

The invention, therefore, is not limited to the specific construction and arrangement shown. What is claimed is:

In a carburetor including a suction column carrying a superposed carbureting unit proper and adapted for communicable attachment to the fuel intake of an internal combustion engine or utility requiring a combustible mixture of air and vaporized fuel for its operation and by its operation creating the suction in the suction column, said suction column containing a throttle valve and being provided with a lateral air intake above the throttle valve and controlled by a capacity controlling valve, means for supplying a combustible mixture for operating the engine or utility to which the carburetor is` applied at idling speed with the throttle valve closed and for starting purpose with the throttle valve open and the capacity controlling valve closed or nearly closed, said means comprising aunitary assembly including a body block attached to the carbureting unit proper and having a transverse bore communicable with the liquid fuel supply withinthe carburetor unit proper, means for restricting the flow of liquid through said transverse bore, a longitudinal bore in said block communicable with said transverse bore and provided with a self-closing valve yieldably held in normally closed position, interconnected means between said self-closing valve and the throttlecontrolling valve is in closed or nearly closed position, a companion longitudinal bore in said body block, a pipe connection between said companion bore and the suction column below the throttle valve therein, a lateral passageway'in said body block connecting said first-mentioned bore and companion bore therein, an air inlet port in said body block communicable with said companion bore therein, and a selectively adjustable valve element for controlling the supply of air to said companion bore from said'inlet port.

GEORGE V. LEHEW.

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