US1210799A - Carbureter. - Google Patents

Description

l. LHAWXHUHST. In. E. F. NICLM.

CARBLIRETIER.`

Armcmon man un. 3. ma.

Patented Jan. 2, 1917.

HHH!! ne ntpors:

egg.

den@ end-'f Queens and Sta l' etomizing theA fuel,- und Vor chis's of f carb .'29

UmTED smrlsf PATENT'OFF-ICE.

CARBUBETx-n.

. 'Application nie-ii umn s i'i'sls. seal Nq.,

ltlon.

.j O ur invention lreliites to car-hunters. .de signed 0;1 .15

be. ueed"v'vith :iriten'al oombus. tion engines toproduceu combustible mixture froxai'r'and a -suit with and more .particularly to with the power.systeinsV of'autoinohiles u nd 'similzijr self-propelled vehicles nndfm which a* pre'liurinary4 mixture containing' e 'e comparatively `large portionof liquidiuelis :frst fformed bythe ato'mizin-g action of :i

' vto ow p :1st.'a fuel' Asupplynozile by the suction-or val duomg action 'of the engine,

diluted to pro! nary mixture is subsequently duce a proper combustlble ,further supply of nil-'adm ports und pussngesf controlled by un Aautolnzlticu'lly operating'v air-Valve. the opera'tlo-n4 of which is like\\ is e.. dependen't upon the. suction or v'afcuum `producing action ofthe engine l.with 4which the ca normal opera-tion A.of t'he engine, that is when 45' ing valve referred to com'esinto operation :the eng'une is'` operatingunder'norniel load Pm '4 .ure 'suitable for sup# .is running slowly conditions, :und ut highduce' u 'comlulstible mint speed, serre to ng, and 'When'the' A v:1s-the speed of the engine;v increases and ad- 4 und isopernting, n

hy .dilute the rich 'mixtu mits an addition of nirto there` re and form 'a le. mixture for 4use when thrilled rits n'QImulzSpeed, ndez; 4n'orl'nul Vload condinl quantity v.proper combustib the engine hns- :i

tions.

.The objects 4of our invention are to pr'o able, .liquid by mixing 4air there' that typeureters designed for? use inixture" by.' 'a v ittedf through l rlgureterl'isused. .In such cnrburetersthe 'elements which p ro- -mlxture 1n the.

tionnI'Letters Pzitent..4

1 -Patented dan. .2, 19'1 81,865, 1

type aborereferred ch -a betterand'u more econ( mica] passa ges dilute-therichmigiture produced l the 'operation of the auxiliary air ialve' 'regulated` end controlled, ments off-seid and the ,move- ."v'alv'e cushioned, whereby a 'more uniformsction xof seid valve is' secured; to provide a' carburetor in which'l the various'pnrts maybe more readily adjusted relative to one .another, and.. the

lll) re whereby the' supply of a'uxilf.

'may

adapted tothe 'engine with which it 4is to be used,thanhas heretofore usually been Jth'e case; 'to provide a simple in construction und effective for the purpose for .which it isdesigned; undone in, which the .combusti inore nearly uniform throughout the enti-re ronge' of speed nndlo engine uitlmvl'rioh it fis to be used than has een the c ase inprior carbureters ofthe type to which our invention relates; andto other- -wise iniproveA upon andenhence the etli- 'ciency of corbureters internal combustionengines.`

)Vith the. above and other-'objects of ini' ventionin viewg-our'invention 4consists in the improved' czfu'b-ureterfor internal combustion engines illustrated in the accompanying .rlraxvi1 1g.' desori '.icntion; :rnd w-irticulurly claimed, and in Such" vu riutiohs will he obvious to those s lri'lled which ou'I` inve n 4ap'plic'ution and wherein ad- .conditions of the accompanying; and' form- 1- the-'preferred -en'lbodinienty of our invention is illustrated', und wherein4 the sinne referfA eure numerals are empl like pfui-ts in vthe "Several figures: Figure l is :l view showing n section of our improved mirhureter taken' -upon .a' vertical central ble .mixture will b edesigned for usewth and 'modificationsthereof as 'V eyed .to 'designate plane indicated by the -line1-1, Fig.2; and 105 F1g.' 2 isaJ-viewshowing a section thereof upon transverse planes indicated by the broken line 2 2, Fig` 1.

Referring to the drawing, the reference numeral 3 designates the main or body portion and 4: the hase portion orvbottom of a two-part exterior easing within which a carburetiug and mixing chamber 5 is provided, said body and base portions being formed separate from one another and secured together by a threaded-connection at the lower end of the body portion in the preferred embodiment ot' our invention illustrated.

Depending from the bottom or base member -1 is a tubular portion 6 within which a vertically arranged air passage 7 is formed, said passage being preferably contracted at its middle portion to form a Venturi, as

shown; the lower end of said air passage being in open communication with the atmosphere through a spider 8 in threaded engagement with the lower 'end of the tubular portion, and an adjustable connection 9; which connection is provided in order that the carburetor ma be connected with a source of heated air, if desired. The upper end of the air passage 7 extends through an annular projection 10 formed upon the lower casing member 4 and extending up into the interior of the casing, as shown, and ter-` minates in an upwardly extending annular flange 11.

The reference numeral 12 designates a float chamber surrounding the de ending tubular portion 6 and held in place tween the spider 8 and the underside of the base member 4, and to which chamber a liquidV friel is supplied through a fuel supply pipe to be connected with the nipple 13, the level of fuel in the float chamber bein controlled and kept constant by means o a float 14 acting upon a fuel supply. valve 15 through a bifurcated lever 16 ivotally supported at 17, as is usual in carliureters of the type to which our invention. relates.

Located within the air passage 7 is a fuel supply nozzle 18- which 1s placed in communication with the interior of the float chamber through a fuel supply passage 19 as shown; and the carburetor casing is provided with an outlet passage 20 throu h which the combustible mixture flows to t e engine with which the carburetor is used, the flow through said passage being ordinarily controlled by means of a valve 21 carried by an oscillating shaft 22, as is usual in carbureters.

Surrounding the upper end of the air pas sage 7 a'nd located within the carburetor casing is a vertically adjustable annular valve seat 23, the same being preferably adjustable upon the annular projection 10 as by being in threaded engagement therewith, as shown; the adjustment of said valve seat being provided for by providing a project- .through one or more of the auxiliary air inlet ports 27 provided in the earburetcr casing for the admission of additional air to dilute the rich mixture first formed; and said valve seat may be rotated to adjust its position, vertically, by means of a suitable tool passed through an air port and inserted into the recesses. It will be understood, however, that other means may be provided for adjusting thc valve scat, as our invention includes an adjustable valve seat in combination with other elements, together with means fora'djusting said valve scat, as particularly claimed hereinafter. A spring pressed plunger 28 is carried by the adjust able valve seat inV the form of our invention illustrated, the lower end of which plunger enters one of a series of depressiom` 29 provided in the base portion 4 to thereby hold said seat in position and prevent accidental rotation of the seat after it has been adjusted into proper position.

The interior of the carbureter casing is formed with or shaped to provide annular concentric portions 250, 31 of different diameters, and 32 designates a vertically movable annular air valve located within'thc carbureter casing and having concentric annular ` portions 33, 34 which move in contact with the concentric portions aforesaid of the interior of the casing, whereby an air chamber 35 is provided between the air valviand the carburetor easing. 'lhrI lower end ol' (he said air valve is provided with an annular )ortion 25 which coperates with the adjustable valve seat2l and contacts therewith when said air valve is' in its lowermost position; and the lowerend of said valve is provided with a depending annular 'portion or rim 36 which lies opposite und obstructs the flow of air through the auxiliary air inlet ports 27 when said valve is in itsI lowermost position, as shown.

The air valve 32 is operatively connected with a metering or needle valve 37, the lower end of which enters into and controls the llow of fuel through the fuel supply nozzle 18, the upper end of said needle valve being connected with a erossbar 38 carried by the air valve as shown; and 39 designates an air passage extending from the interior of the carburetor casing through the wall ofto How into said air chamber from the -ex .teruel atnriosphere, and to prevent the flow of aix` from saidelia'mber. The urea of the gir passage 40 ma fbe I egulated and ad- 5 justed by means o` a valve 4,3 in threaded engagement with the 'valve easing llvand l saidV regulating valve is held inposition after the parts have been properly adjusted by meansofa lock nut 44.

Whenthe engine \v ith \'vl1iel1 ourA improved Carbureter 1s used 1s jrunnmg without load,

or idling, as when the engine is permitted to runf. at reduced speed while the automobile is standing still, and also when the engiueisstarted 0r is operating ai low speed, the auxiliary air valve 32 is l1n its lowermost position with its annular portion resting upon the adjustable valve seat 23 and all the air neeessaryto form the combustible mix! ture then enters the carburetei` cas'in through the air passage-7 andntomif/es the liquid fuel supplied through the fuel lsupply nozzle 18. 4 .g-

It is important 4that the air and fuel shall 5 be soproportioned as toseeure Va 'smooth and uniform operation of the engine-without misfires whenthe same is operating under the conditions above referred to, Vand like v Wise important, that the ,consumption of fuel 55* bei* through the 32, whereupon t 0- at suehtimes=sl iallf be as low asfpossible, which results or ends are secured by the vertieally adjustable valve seat 23, it being obviousthatl upward movement imparted to saidvalve seat'will be transmitted through 5 'the air valve l32 to the fuel controllin valve 37, thus moving'said4 valve out of te vfuel supply nozzle'liexd permitting a more co,V

pious supply of fuel to the stream o' air 4flowing past said nozzle;y while "downward o movement of 'said-adjustable seat will lle-aceompaniedbyva. decrease-1n the amount of -fuel Vfloviing through the fuel'noz'zle. Onrf improved carbu'reter can'lihereformgb'y prpl erlypositioning the'A adjustable valveseat -1n 5 question, besoadjusted-as to secure ,a proper operation ofN4 the engine'4 with which it Vis used when `Clie/saine is runningfvvitloiit load or at low'speed, and so adjustedas tosecuresuch operation \vith. a minlm'um consump 0' tionof fuel.

'As the lspeed of -thelengine inexteasesithe resulting suetiivnor` vacuum' 'producing ae- .tion reeluees,` thel"pr essure.w1thin the .air chamber 35 ther i'rflowing from said champussage V3,9 in the' air valve e (pressere:ofzthe4 atmosphere aetingupxvai lyf'u on v'sind' en valve A causes' it to moveaipyjar ,fthus' moving' the seating portionof said valve.' offfom' the 0. adjustable yalye seat 23 and llllu'overmgoi: 'opening fthe t auxiliary-lair l.inlet `ports 127.

` Additional r airf will fthus be Vadmitted V.t0-g the 'earhuretereasing tlfiiiugli saidports 'sind befV f the 'rieb Preliminare-minare femefviith I in the air erating un tions. l

'lhe air inlet ports 27 are obriously opened graduallyv as the air -valve' rises, because of passage 7 when-the engine is 36 uncovers said ports progressivelyr and does not open `them entirely until t ie air valvev reaches the exi/ent of up wurd movement .offsid air valve is Obviously dependentnpon the viii-uum produced withintheair chamber 35. vThe 'rapidity of the upwardmovement of the earbureteradj usted so as vtoseture an approximately uniform' combustible mixture at engine speedsV vary-ing throughout a wide range, b v means' ofA the 'adjustable valve 43 an' inlet passage 40; it being obvioug that if air is permitted to flow into the air cham-- ber nearly, as fast iis-it is withdrawnthere-from-A thr'ough the air passage 39 the valve willreel slowly, while if the iiow through Vthepassage :110 is more' restricted said valve' will rse'more rapidly.V @Finally the inwardly,opening eheek valve 42 iii-the air passage 40 closes upon a. sudden* or exg'esive upward movement ofthe air valve, due. ior example, to a sudden opening of the throttle valve which eontrolstli'e;flwto the engine: whereup'oufthe,air chamber 35` will 'act as 'a dash' Vpot and Cushion the upward Vmovei'uentof.said valve". Said cl1eck-val ve' will not, however, interfere with tl1e downward movement of the air -valvegandi said valveinoves down and into 4contact with the adjustable valve seat 23 and into a position suoli-that 'itsl dp'ridingrim 36 overlie'sand obstrqc-ts "the auxiliary air" inlet 4 ports 27, w'hen'the engine'stops or its speed is reduced materially'flrelow ,the speed-nt which it norn'iallypperates. 'l Having thus described land explained our invention," we claim md desire to secure -hy 1. `In acarlrureterof the elass deseribed, a

suitable' aSinghav-ing 'a vertically arranged air passagenjeminunientglon with theaftf 1.1: 'iary air. inle't ports independent of l,said "air mospliere' ati-ts lower end, a -seriesoi' atinil passage and which. ports a'rejindireet 'oom'- r mun'iatoinfln'ith Vthe atmosphere, and4 an L :outlet passage 'through .wliiclrlV Ae'ombiistible mixture ,may HQW a uelfsupply nozzle vl-g its uppermost position; an'd the auxiliary air valve 32 is regu lted, andA whit-h controls the flow of air through the 0l i er nornmlspeed and loau condi thefact that the depending portion .o r rim' and a val ve fuel tart with the interior of said casing'. l'ucl .supply vali'e carried liv said aii' and ailapted to control the tloiv ol' through said l'uel .supply no'/,'/.lc.

1. lu a carliurctci' oll llic class dcscrilicd. a suitable cabineIr having'. a vertically arraicd air passage, in coniniunication with thi atmosphere at its loivcr end. a series ol' auxiliaril air inlet ports in connnunieation with the atmosphere` and an outlet passage through which coniliiistilile, niixturc uiai' lloii': a l'ucl Supply now/.lc located within ,said air passage: a vertically adiuslalile ariY nulaivali'c lscat `surroundinrr thc upper end of said air pass-age: incausl tor adjustingl said valve seat). a icrticalllv inovalilc annu lar air valve located within said casinar and havingr an annular portion adapted lo co operate with the valve seat at thc upper cnil of said air passage. the lower end ol' Vaid valve lying oppositey the ports aforesaid when said valve is in its lowcrniod position vand the periphery thereof moving in contact with the interior ol` said raging: and a t'ucl suppl)T valve carried lilv said air valve alid adapted to 'control thc tlo\\ of fuel through said fuel supply nozzle.

Il. `ln a carhurctcr of the class dcscrilicll. a .suitalile easing havingr u vertically urv ranged air passage in rounnunicatiou with the. atmosphere at its` lower ciuhlatcrallv dis'- poscd ports located adjacent thc upper end of said air passage :ind also in communication with the atmosphere. and au outlet passage through which coniliustihlc niix ture li'ii)v flow; a fuel supply now/,le located within said air passage; an annular valve seat surrounding thc. upper cud oll said air passage; a vertically niovahlc,annular air valve located within said casing and adju cent the upper end oisaid iir passagrc and having an annular seating portion adapted to cooperate with the valve scat at the up per end oi' said air passage.` and 'the lower end of which valve lies opposite the ports aforesaid when .said yvalve is in its lowerinost position:l and a fuel supply valve carried hy said air valve and adapted to control the [low of l'ucl through said fuel suppl v uof/J/Zle. I

4. ln a carliureter of the. class described, a `suitalile. easing: having.r a vertically arranged air .passage in connuuniea'lion with the atmosphere at its lower enth a series of auxiliarji1 air inlet. ports located adjacent the upper end of said air passage, andr'also in communication with the atmosphere, 'and anoutlet passage. through which coniliustihle mixture unify llow: a. fuel supply now/.le located Vwithin said air passage; af vertically adjustahle aluiiihir \'al\'e seat surroiuidiu air passage; means for adjusting: said valve scat; a vertically movable annular iur valve located ivithni saidl casing and adjacent the annular portion Y lunugh and located adiaccut the upper vend of Smidt upper end of said air passage and having an adapted to coperate with the valve seat at the. upper end of said air passage. the, lower end of said valve lying opposite the ports aforesaid when said valve is in its lowerniost position; and a fuel supplv valve :arried h v said air valve an adapted to control the flow of fuel through said l'uel supply'nozzlc.

.3. ln a carliuretcr of the class described, a lsuitalile casing havingz,r a verticallj.' arranged air passage in communication with the atmosphere at its lower end7 a series of latcialliy disposed auxiliary air inlet ports located adjacent the upper. end of said air passage and also in communication with the atmosphere. and au outlet passage through w hich conihustihlc mixture ina'v flow; a fuel suppl)- nozzle located within Isaid air passage; :in annular valve seat surrounding the upper cud ot said air passage', a vertically inovalile annular air valve located within rsaid casing and adjacent the upper end of s-aid air passage. said air valve having a portion adapted to cooperate with the valve `scat at the upper end of said air passage, and a dependingIr portion adapted to ohstruct the flow of air through thel ports aforcsa id ivlie1i said valve is in its lowerniost position; and ca fuel supply valve carried h v said air valve, and adapted to control the tloiv of fuel through said vfuel supply nozzle.

ti. ln a earliuretcr of the class described, a suitalile. casing having a vertically arranged air passage in communication with the atmosphere at its lower end, a series of laterally disposed auxiliary air inlet ports in connnuuieation with the atmosphere, and an outlet passage through which combustible niixture ina flow; a fuel supply nozzle located within said air passage; an annular valve seat surrounding the upper end of said air passage; a verticallyr movable annular air valveA located within and the periphery of which inoves in contact with the interior said casing. said air valve havin a seating portion adapted to cooperate wit the valve seat at the. upper end of said air passage and a depending portion adapted to obstruct the flow of air through the ports aforesaid when said valve is in its lowermost position;

and a l'iiel supply valve carried by said air` of fuel valve and adapted to control the How through said fuel supply nozzle.

'i'. ln a. .carhureter ofthe class described, a suitable casing having a vertically arranged air passage in communication with the. atmosphere atl its; lower end, a series of auviliariv air 'iiletports in. communicationy i.iiltere. and an outlet passage which combustible mixture may low: af fuel' aup'ptvnozzlelocated ifi'ith'ii I.'aid nii pausagcriui annular projectionlo- 'pued within said casta eltidfstlrrouadi'ng he. upper eiid of said al piliSSggbi; an apl nular valveseat carried by said 'projection through which' 4combustible mixture mayv and adjustable thereupon; a verticallymov' flow; a fuel supply nozzle located within able-annular air valve located within said said air passage; ainannular projection lof-asing. and the lower end of which valve lies cated VWithin said casing A andsurrounding opposite the portsaforesaid when said valve the upper end of said air' passage; an annuis in its lowcrmost position, said valve havlarvalve seat in threaded .engagement with mi: an annularportion adapted to copeur,` said projecticma vertically movableannu 1 *s ate with the valve seat atthe upper end `if iur an' valve located within'said casing and said air passage: and a fuel supply valve.. the loiver end Vol"'\vhich valvelies 'oppositecarried hvsaid' air valve and adapted to conthe ports aforesaidV when said valve 1s 1n its trol the `fiovv of fuel through said fuel slup-V ilowermost position, said valveha'vin'gan anply nozzle.- Y Y 5 nular portion adapted to cooperate-wlth the fi. In a carburetor of the class described,"- valve seat'l at the upper endof said air pasrauged air passagex in communication with ing` in contact ,with the interior of said ca s-V the atmosphere at. .its lower end, a series of ing; anda -fuelsupplv valve earned by said.

'auxiliary air inlet ports ,1n communication air valve-and adapted to control-the flow of with the atmosphere, and an outlet passage" fue] through said fuel vsupply-npzzle.

through \\hich combustible mixture 'may 11. In a carburetor 'of thoclass described, flow. :i fuel suj'iplv' nozzle located within a suitable casing'having a vertically arsaidV air passage: an annular projection lo-V ranged air passage in communication with n Y n i 3 Y a suitable, asing having a vertically arsage, and the peripheryy of said valve mov cated. within said casing and surrounding the atmosphere-at its lower end, a seriespfV the. upper end of said air passage; an an-f auxiliary air inlet ports in communication .|1i1liir`\'i1lv'e scat carried b v said projection with the atmosphermand an Qutlet'passage .i i v. ith the atmosphere, and an outlet passage lowermostposition, scid valve having an anlfm` *rior of said rasingraud a fuel sup ly valve the j 9. lua carluiretcr of the class deseriheu'l7 a sage suitable casing having aY vertically arranged concentric portions of different diameters,

`upper endof said air passage; an annular'vnozzle.

sage; and afuel supply va'lve carried by said Ssrid au'` and adjustable thereupon; a verticall movthrough which combustible mixture may -alile annularair valve located within said How; a fuel supply nozzle vlocated Withinv raising and the lower end of which valve said air passage; an annular projection 1olies opposite the ports aforesaid when said cated within said casing and surrounding valve is in its lowermost position, saidvalve, thcnpper end of said air passagman annu'- ha ving yau annular portion'adapted to colar valve sia-[ in threaded engagement with operatiewith the valve seat at the upper end- `said projection; a vertically movable annuoi' said air passage, and the periphery of said valve moving: in Contact with theintethe lower end of which valve lies opposite carried by 'said air valve and v-a aptcd to lowermost position. said valve having anancon'trolthe flow of fuel through said fuel ,nular` portion adapted to cooperate with the supply nozzle. valve seat at the upper end of said air pasthe inner surface of said casing having air-passage in communication Wielrthe lituiosphere atfit's'lowc'r end, a series of auxil-l iary air inlet ports in communication with they `at1iiosphere, and an 4outlet passage concentric portions of said casing, whereby through which comhustihle mixture may' an 'air chamber is [provided between' said flow; a fuel supplynozzle located within valve and casing; and a fuel valve carried sa'l airpassage; au annular projection loby said 4'air valve' and adapted to control cated within said casingand surrounding," the the flow of fuel throughsaid fuel supply 'and the periphery of said air valve having alsoconcentric portions of different d1am- A12. In a carbureter of the class described, a` suitable casing havinga vertically arvalveseatin threaded engagement'with said projection; a verticallymovable annular air valve located within said casing and the lower end` of wliichjvalvc lies opposite the portsaiforcsaid when-said valv'e is in its lowerinost positiomsaid valve having an annuwith the. atmosphere, and an ou'tlct passage lar portion adapted to coperate with the' through which combustible mixture 'may valve seat at'the. upper end of said air pasflow; ,La fuel supply .nozzle located within passage; amannular projection lothe atmosphere at its lower. end, a series of au' valve and 'adapted tocontrol the flow. liu-l through said fuel supply nozzlethe .upper end of said air passage; an annu- 1U. ln a rarhuretenof the dass described. lar valve seat'in threaded engagementA with a suitable .casing having a vertically arg said pojection';'a verticallyinovahlc annura-iigrcd air passage in communication with lar air valve located `within saidcasingand the atmosphere-at its lower end, a series of the lower endmf which valve lies opposite auxiliarvlairinlct ports in communication the ports aforesaid when said valve is in its lar air valve located within said casing and port-s aforesaid when saidvalve'is in itsY eters' adapted to movein contact with the ranged air passage in communication with' auxiliary air inlet ports in communication of cated within said casing and s'urrounding'- l -the concentric portions nular portion :n

nular portion adapted to coperate with the valve seat at the upper end of said air passage; the inner surface of said easing having concentric `portions of different diamm eters, and the periphery of said air valve having also concentric portions of different diameters adapted to move in Contact with of said easing, wht-rch)v au' air chamber is provided between said valve and casing; means for regulating the action of said air chamber; and a fuel supply7 valve carried by said air valve and adapted to control the flow of fuel through said fuel supply nozzle.

lil. ln a carbureter of the class described, a suitable casing having a vertically arranged air passage in communication with he atmosphere at its lower end, a series of auxiliary air inlet ports in eounuunitaition with the atmosphere. through which combustible mixture may llow; a fuel supply nozzle located within said air passage; an annular 'irojection located "within said casing and surrounding the uppereul of said air passage; an annular valve seat in threaded engagement with said projection; a vertically movable annular air valve located within said casing and the lower cud of which valve lies opposite the ports aforesaid when said valve is in its loam-most position. said valve having an anlapted to cooperate with the valve scat at the upper cud of said air passage; the inner surface of said casing having com-entrie portions of dilferent dian'ieters, and the periphcrjvr of said air valve having also concentric portions of different dialnetcrs adapted to move in contact with the concentric portions ot' said casing, whereb)y an air chamber is provided between said valve and casing; au air passage leading from the interior of said casing into said airychaiular: au air passage leading from the atmosphere into said air chamber; an inwardly opening chccli valve located in said air passage; lui-ansl Vfor varying the area of said air passage; and a Yfuel supply valve carried b v said air valve and adapted to control the iow of fuel through said fuel supply nozzle.

14. In a Carhureter of the class described, a suitable casing having a vertically arranged air passage in eoinu'iunication with the atmosphere at its lower end, and an'outlet passage through which combustible mixture may flow. and the inner surface of which easing is formed with concentric portions of ditlereut diameters; a fue] supply nozzle located within said air passage; a vertically movable annular air valve located within said casing and having an enlarged lower end adalited to move in contact with the concentric portion of the casing of the greater diameter, and a smaller upper end adapted to move inV Contact with the colleenand an outlet passage.

trie portion of the easing of the lesser diameter, whereby an air chamber is provided between said valve and casing and above the enlarged lower end ol said 'alve, said Casin being provided with air inlet ports located adjacent enlarged lower end of tlie air valve and through which ports air may flow past lsaid lower end-and into the interior of said casing; and a fuel supply valve carried hy said ai`r` valve and adapted to control the flow of fuel through said fuel supply nozzle.

15. In a carinii-eter of the class described, a suitable casing having an air inlet passage in connnunication with the atmosphere; aux iliary air inlet ports also in communication with the atn'iosphere, and an outlet passage through which combustible mixture may flow; a fuel supply nozzle located within said air passage; a vertically adjustable valve seat surrounding the upper end of said air passage; a vertically movable air valv'e located within said alsingand having a portion adapted to eoperate with the valve seat at the upper end of said air passageand a fuel supply valve carried by said air valve and adapted to control the flow of fuel through said fuel supply nozzle.

lli, In a carburetor of the class described. a suitable casing having an air inlet passage in connuunication with the atmosphere, auxiliar)y air inlet ports also in connnunication with the atmosphere, and an outlet passage through which eombustible mixture may llow; a fuel supply nozzle located within said air passage; a vertically adjustable valve seat surromuling the upper end of said air passage: a verticallyv movable air valve located within said easing and having a portion adapted to cooperate with the valve seat at the upper end of said air passage; the inner surface of said easing having concentric portions of 'lill'erent diameters, and the periphery of said air valve having also concentric portionsof different diameters adapted to move in Contact with the con centric portions of said casing, whereby an air chamber is provided between said valve and casing; and a fuel supply valve carried liv said air valve and adapted to control the llow of fuel through saidfuel supply nozzle.

17. In a carburetor ot' the class described; a suitable casing having a vertically arranged air passage in communication with the atmosphere at its lower end, and an outlet passage through which combustible mixture. may flow` and the inner surface of which casing is formed with concentric por tions of different dian'ieters; a fuel supply nozzle located within said air passage; an adjustahle valve seat surrounding the upper end of said air passage; a vertically mov able air valve located within said casing and having an enlarged lower end adapted to move in contact with the concentric portion of the casing of the greater diameter, and a a suitable easing having,lr au having a portion 'cham ber is .easing being provided N Ioeated adjacenftl .in terlor of said easing Supply nozzle.

va suitable easing having a ,air valve loealed Lthe i supplw'valve earrled 45 'eoneentrir smallerupper,end adapted to move in contact with the coneentrie' portion of the casing ot'- the leaner diameter, whereby an4 air provided between said valve andr easing; and said valve, said valve'havlng a portion adapted to eoperatewith the the upper end of said ail-,passage and said with air inlet ports no en'larged' lower end of theair valve andithrongh which ports air may flow past saidlower, enel and' into the and a fuel supply valve Carried by? Said air 'alve and adapted to, controlthe of the elaas described, vert iea ily arranged air passage in eonnnunieation with the atmophere at its lower rnd. a series of 'anxiliany air inlet ports in eonnnnnieation 18. In a `arbureter whieh eombnstible `nuzvture nia \v suppl)l nozzle loi-ated within all' passage; a vei'tieallv .adjustablean- Jjiular valve seat lmrroululingr the upper end of Said air passage: -me'ans for adjusting said valve leatza vertii-alltr movable annular within said easingr and the lower end of' 'whieh valve lie` opposite the 'I iortn' aforesaid when laaid valveisin itslowermost posltionr-sanl valve havin);lr an ptfd 'to roiiperate with .the valve Seat atthe upper end V:if-said air passage; the inner surl'aee ol' said .easinaglr having; eonrentrie portions ol (lill'ei^ent di anieters` and lhe'lwriplleiv ol' Said air valve'l having alao rom-entrir portions-ol ilitlei'ent 4diameters adapted lo move in eonlaet with annular portion ada the emeentriiportir'nla4 ol said l easing, wherelrv an an' ehaniber is provided between means for regulatingr rhaniber; and a fuel b v said air valve and adapted to eont'rol the flow ol Fuel through .said 'fuel supply now/.lefl

' 19. ln a earbureter of the rlass d ewerilmd,`

a ir inlet -p'aaaagreY m 'eommuniration with the'atmosphere` and an 'outlet passage througlrwhieh Veoniluotible'mixtnre may flowxand -the inner surlare of whirl) 'easing has eoneentrig portifnnolE dill'erent diauuwters; an adjustable valvelmat surrounding the upper end ol said air inlet, passage: :ofnel supply nozzle loeatel w said air passage; a vertically movable annie lar air valve located within Said easing al'ld nl lnpled -lo el'iiipel'ale.\\`lllL said valve havinrr an en llarged lower end adapted to movefin eontael` with the,eoueentrie portion `ol" theeaaing "of the 4greater diameter;` and a smaller upperY ond adapted to n1ove in rontaet willrthe portion ot'V the easing' ol' the lesserrdiameterz 'whereby an air elunnber said valve and easing: aetion ol' said an' said valve seat..

above the enlarged lower end of valve Heat at flow of-fueliln'ou'gh said fuel an outletpassage di llerent .end adapted to move in Veenrie portion ofthe i a Smaller upper end adapted eoneentrre -'por-.

to move in eontaet with'the easing of I -he lesse* diameter.

ilhin ble mixture may "of whleh easlng ranged air inlet passage in mnnnunicaton with the atmoephere :it its lower end, and- `an outlet passage, through which eo`mlmsti,V ble mixture may Ho\v,and the inner 'surface of which easing' has concentrie portionsof different dialnet-eral a fuel supply nozzle lorated withinsaid air `passagge eallv Amovable annular within said easing and having an enlarged lower end adapted to move ineontaet with the eoneentrie portion of` greater diameter` and a Smaller npperelnl .adapted to move in eonlaetwithlth'e concentrie portion of the easing of the lesser .dialnwhereby 4an a'irr ehamber is provided bk-)tween said valve, and easing and'ihove' the said easing. h air Inlet ports located 'of the air enlarged 'lower end ofeal'd Yvalve being provided wit adjarent the enlarged 'lower end' valve and 'through whielr portal .into the interior of saldi-asin r. Y

Llt n a Yearbureter rif-'llie-lzis dexeribed. a suitable eaeingliavingr an airinlet palwnage in eomn'inniration with the atlnoq'ihere and an outlet passage through whieheombnsti` ble mixture mar flow. and 4the inner snrt'are of Whieh easing has eoneentrie 1 fuel supply nozvfle loeated within Said an' passage; a vertiea'llv movable annular air valvef loea'ted within Said easing and having an enlarged lower easing: of the greater diam-eter. and

tion of the wher-libran air eliamber is provided between said valve and easiugfand above the enlarfred lower end of said valve: said easingf being. provided witlrair inlet portsloeated adjaeent the enlarged lower end of the air valve through whieh ports the interim" ol Said easing: -and means for regulating the action of saidair ehamber.

2i. ln Ia ear n'eter ofthe claas described'. a. suitable eaing` having' an air inlet [passage in Communication with the atmosphere, and an outlet pa wage through' whielr Aeombuat-` lli nu a nd llra carbureter o f theolass described,v

g and -a verti-f au' valve located the easing of the" air may llow air niav llow into portionsof eimta'et with the rollL 7 1'20 theinner surface e han eoneentrle. portions of different diameters: a l'ue'l supply ,nozzle lo eated lwithin said 0 movable ann ula i' air valve aloeated within Said easing' andA having an enlarged lower end adapted to unive ineontaet with the ront-engtrie portion .of the easing' of the greater di. aineler` and a sn|al`ler1lnper-end adapted to more in eontaet with the roncentric ptiixlipnair passage; av vzertifalltr4 irs of the Casing of the lesser diameter, whereby an air chamber is provided between said valve and casingand above the enlarged lower end of said valve: said casing being provided with air inlet ports located adjacent, the enlarged lower end ot' the air valve and through which ports air may llow into the interior ol' said casing: an air passage, leading from the atmosphere into said air chamber: and means for var ving the area of said last mentioned air passage.

23. In a carbureter of the class described. a suitable casingr having an air inlet passage in commun' ation with the atmosphere. and an outlet passage through which combustible mixture may llow. and the inner surface ol which casing has concentric portions of dit'- ferent diameters: a t'nel supply nozzle located within said air passage: a vertically movable. annular a-ir valve located within said casing and having;` an enlarged lower end adapted to move in contact, with thc concentric portion ot' the casing of the greater diameter. and a smaller upper end adapted to move in contact 4with the concentric por` tion of the casing: ot' the lesser diameter. whereby an air chalnber is provided between said valve and casingl and above the enlarget1 lower end ot' said valve: said casing being'l provided with air inlet ports located adjacent the enlarged lower end of the air valve and through which ports air may flow into the interior of said casing: an air passage leading from the interior ot' said casing into said air chamber: and an air passage leading from the atmosphere into said air chamber.

E24. In acarbureter of the class described..

a suitable casing having an air inlet passage in communication with the atmosphere.` and an outlet passage through which combustible mixture may flow, and the inner surface. ot which casing has concentric. portions of ditI` ferent diameters: a fuel supply nozzle located within said air passage; a verticallyY movable annular air valve located within said casing and having an enlarged lower end adapted to move in contact with the concentric portion of the casing oti the greater diameter. and a smaller upper end adapted to move in Contact with the concentric p0rtion of the casing of they lesser diameter. wherein` an air chamber is provided between lsaid valve and casina' and above the enla rged lower end of said valve: said casing being provided with air inlet ports located adjacent the enlarged lower end ol' the air valve and through which ports air may llow into the interior ol' said casing; an air passage leading: from the interior ot' said musing` into the said air chandler: an air passagelading from the atmosphere into said air chamber: and means tor regulating the llow of air through said last mentioned air passage.

:2.7. ln a carbm'etcr ot the class described. a suitable casinar having an air inlet passage in communication with the atmosphere. and an ontlct passage through which combustible mixture may llow. and the inner surface of which casingr has concentric portions ol' dil"- lerent diameters'. a i'ucl suppl)Y nir/.ale lo cated within said air passage: a verticallyn movable annular air valve located within said casing and having an enlarged lower end adapted to move in contact with the concentric portion ol' the casini;lr oi' the greatediameter. and a smaller upper end adapted to move in contact with the concentric portion ot' the casing of the4 lesser diameter. whereby an air ohamber is provided between said valve and casing and above the enlarged lower end ol. said,valve: said casintr being provided with air inlet ports located adjacent the enlarged lower end of the air valve and through which ports air may llow into the interior ol' said casing'. an air passage leading from the interior oi said casing;r into said air chamber; an air passage leading from the atmosphere into said air chamber; an inwardlyv open u heck valve located within said last mentioned air passage: and means for regulating the tiow of air through said last mentioned air passage.

In testimony whereol'. we have signed our names to this specification this 25th day o'l Februaryv 19H3.

JOHN JAY l'li\\\"1\'llllll5'l`. Jn. EIHVAND FRANK NICOLAI.

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