US1576295A

US1576295A - Carburetor

Info

Publication number: US1576295A
Application number: US220966D
Authority: US
Inventors: Frank H Ball
Original assignee: BALL AND BALL CARBURETOR COMPA
Current assignee: BALL AND BALL CARBURETOR Co; BALL AND BALL CARBURETOR COMPA
Priority date: 1918-03-07
Filing date: 1918-03-07
Publication date: 1926-03-09
Anticipated expiration: 1943-03-09

Description

March 9 1926. y 1,576,295

F. H. BALL CARBURET OR Filed March v 191s 2 Sheets-shut 2 ieiented .it/lar. 31,

,1.5763295 rsur OFFICE.

FRANK H. BALL, F DETRIT, lMI(.'lI-IIGrAN., ASSIGNOR, BY MESNE ASSIGNMENTS, T0

BLL AND BALL CARBUBETOR ClXMPANY,"0Fl DETROIT, MIGIGA'N, A- PARTNER- S- UGMPOSEB 0F FREDEREGK 0. BALIR'AN'D CORNELIA Miu/:BALL

oennlunnrou.

application mea Marca r, 1ers. Serrara-@ecosse y i l" .To all rhomzzf4 may cou/oem.'

Be it known. that I, FRANK H. BALL,a

` citizen of the United States, residing at Detroit, inthecounty of lVayne .and ot' Michigan, have invented new and useful limprovements in Carburetor's, of which the following is a specification. This inventlon relates to carburetors an consists in certain improvements in the construction thereof as will be hereinafter fully described and pointed out in the claims.

The carburetor comprises a primary care buretor adapted to utilize a higher volatile uel, sueh as gasoline and a, secondary carbui-eter' adapted vto use a less volatile :fuel

such as kerosene. While the primary and secondary carburetors have advantages independent'of their association with each other, they are, however, particularly ad-4 vantageous in their construction. inl such relation. 4 i

-The combineddevice is designed to utilize gasoline. inthe primary carburetor for starting 4and slow running when the air velocities are insuflicient to thoroughly .atolnize kerosene so vas. to make. it readily available, also "when the exhaust heat 1s 111-,

suiiicient to vaporize kerosene. The primary carburetor is designed tov deliver the fuel in the form of an emulsion to the point oi? greatest air velocity in said primary can huretorand is so `designed as to deliver a properly proportioned mixture of air and vapor throughout the range ol'v the carburetor while acting independently as n primary carburetor Without the use of yielding valves.

rlf'he secondary carburetor which is' designed to use kerosene is arranged to automatically come into operation when the requirements are suoli as to give an air Yvelocity which will suiiciently atomize l{erosene to assure its ready combustion. In this connection it is desirable to oferV as little resistance to the flow of air as possible [and coiiscuucntly having provided means acting only ivheu conditions are such as to produce permissible air velocity in the secondary carluiretor, the apparatus is so designed that this initial .velocity is not much exceeded in' the more restricted portions oi, said carburetor as the demands fo air through it f crease liu this Way the resistance to the vis etno time excessive.

tats" The invention is illustrated in the accom- Vpanyiug drawings as follows zy Fig. l is a section on the lines l-1, 7-7, la-dmud 1"--elb in Fig. 4.

Figij@ is a section on `the "line 2-2 in rig. i.' l .60

Fig. 3 is a-side elevation of a partlof the carburetor showing the lever for holding the yielding valve" of the secondary carburetor closed. eg 4 Fig. 4 is a-$fection on the lines 4-4 in G5 Figs. 1 and 2. 'i 4 Fig. 5 is a detail View in section on the line 5-5 in Fig. 4. Fig.Y 6 is a detail'view in section on the line 6 6 in Fig. Il. 70 Fig. 7 is a detail vie);T in. section on the line 7-7 in Fig.. 4. y "s l Fig. 8is a, detail View, in section'onl the line 8--8t`in Fig. 2. I

1 marks'the carburetor body, 2 the aso-v 75 line receptacle, or float chamber, 3 they erosene receptacle` or float chamber, 4 the 4main mixing chamber, or the-combined suction@ passage7 5 an upper {iange to adapt it to heb readily secured to a manifold 0r othir pas- 8G. sage leading to an engine, G a throttle valve, 7 a rock shaft carrying the throttle valvet 6, and S'the usual lever for operating the throttle valve. -v

The suction passage of the primary ,carburetor .is provided with a restriction in the Jform of a Venturi tube 9. This tube has a screw-threaded .end 10 which is screwed into a screw-threaded opening 11 in the walls of the passage. The lVenturi tube' has a shoulder 12 at its bottom Which engages an annular shoulder 13 in the su@ tion passage. An annular enlargement 15 is formed' in the passage between f the shoulder 13 `and the screw threads 11 and -95 the Venturi tube 'forms a' closure at the top and bottom of this enlargement forming a chamber or Well airopenii'igjj`17'` leads from the inlet-passage 14 belowftfe Venturi tube to tliis'well`and spray nozzles 100 18 extend from the well into the Venturi tube, the' outlets 'of the nozzles extending .inwardly from the Wall of the Venturi tube f justabove its greatest restriction, the spray nozzles being inclined and the bottoms ot l0 the spray nozzles extending to a point in the well below the gasoline fuel level (5i-G as establishedby the lloat chamber.

Fuel is delivered to the well 16 from the floatv chamber 2. This fioat chamber is of4 the usual form having the inlet 19, valve 20 controlling the inlet, stem 20L extending 'from the valve, collar 21 on the stem, levers 22 engaging the collar and the float 23 operating on the levers in the usual manner to control the valve 2() and thus control the fuel level in the receptacle. The fuel flows from the receptacle to an outlet passage 24 which terminates in an extension 25. A hol.- loW screw 26 extends through this extension and into a passage 27 formed in thev carburetor ybody 1.

An opening 28 forms a connection between the opening 29 within the screw andthe passage 24. A screw plug 30 is screwed into the upper end of the pas? sage 27. This plug extends into the end of the screw 2G. The screw plug 30 has a passage 31 within it and the plug extends into the passage 29 so that'the openingl in the passage 29 makes a continuous passage. A calibrated plug 32 is screwed into the end of the passage 3l. Radial openings 35 extend through the wall of the plug 30 forming a means of communication between the passage {Jil-and the passage 27 outside of the screw plug. An opening 34; eX- tends from the passage 27 into the well 16 .and delivers fuel to the well 16. It will be noted that the radial openings 33 and,

the opening 3a are below the fuel level so that fuel is delivered to the well 16 by gravity.'

The choke valve 85 is provided at the inlet to the suction passage of the primary carburetor. -This is carried by the rock shaft 36 and can be operated bya lever 36a.

It is desirable to provide means for supplying the engine during idling with a very uniform mixture of highly atomized fuel.

This is preferably done by delivering fuel above the throttle and this is accomplished in this carburetor by taking fuel and air from the connection 34 leading to the well 16. A. passage-87 is arranged in the body of the carburetor and connects with the well 34 (see Fig. 5). A vertical passage 38 extends from the passage 37 and is connected by a tube 39 with a passage 4.1i in a projection 40 on the wall of the carburetor body. A nozzle 42 extends from the passage 41 into the suction passage just above the throttle. The passage Ll1 is plugged b a .screw 43. `When the throttle is closed fruel and air -are drawn up through the passages just enumerated and delivered above the throttle. This is sufiicient to maintain the engine while idlingr in'a well known man.

and reduces the level in the well so that as the ltlnottle is opened, the spray is carried initially through the npzzles. If, however, the throttle is so.`suddenly opened that this VIn'eliminar'y movement through the'idling tube does not take lace,l then there is an initial movement of) solid liquid through the nozzles immediately' followed by the spray. Air passes through the openings 1T to the well and'fuelpasses through the openings from the fuel receptacle by way of the

passages

24,28,v 3 2, 31, 33 and 34; to the well. It is well understood that one of the primary but most difficult problems in carburetor construction is the mainte nance of a desired relation between the air and fuel delivered to the carburetor. The high velocity throughtlie Venturi tube reduces the pressure in this tube considerably below the pressure above the Venturi tube. This reduced pressure induces a very high velocity in the spray nozzles so that the fuel is atomized. ThisA movement of air through the spray nozzles toward the lower pres sure in the Venturi tube reduces the ressure in the Well slightly below atmosplieric pressure sothat the pressure inthe well is intermediate. Nhile the opening 17 is shown comparatively large and is in edect directly open to the atmosphere so that the@ reduction in pressure in the Well ls comparatively slight it will be readily understood that a variation in this opening will vary the reduction in the Well and conse quently the fuel flow due to this action.

It will further be understoodthat this at- 4niospheric supply of airthrough'the opening gives a constant and thus reduces thev variables which are encountered 1n mauitaining the proportions of fuel and air.

.This in turn induces a: fiow of air through the opening 17 and also induces a flow of fuel through the opening 345 to the Well.

.Inasmuch as the velocityof the air through the well sweeps the fuel from this well in the form of a spray through the nozzles a negative head is avoided in the elevation of this fuel from the fuel level ofthe float chamber to the upper end of the nozzle because when the fuel is sprayed in the form of an emulsion it ceases to have ,an undesirable gravity effect. l

' A In many carburetors, in fact, the greater number of them7 fuel has been delivered in '.liquid state from a nozzle 'into the air current and in order to prevent the overflow from this nozzle whenthe carburetor is not in use it has been necessary to make the delivery end of this nozzle above the fuel level. This has. created ywhatqis' usually termed a negative head and` it has been be observed, therefore, that in this construction fuel and air can be delivered in exactly the proportions ydesired throu hout the range of the lcarburetor and throng fixed. orifices. 5 Further that this is accomplished while delivering the fuel to the main air current fully atomized by beiig silbjected to air at very high velocity .in the spray nozzles.

The choke valve is used in this construction as itis ordinarily used to enrich the mixture, that is, to get a greater amount of suction with agless amount ofl air. It is desirable in order to maintain the proper proportions that the flow of air to the well should alsogbe restricted to ,the same extent that the tlow of-air to the Venturi tube is restricted and for this reason the openin 17 instead of being made to the atmosp ere direct is made to the inlet of the suction tube 20 'so as'to be Sulz-ject to the action of the choke valve'. It will, et' course, be understood that in the normal operation of the carburetor when running full and the choke valve isl in its normal position, that is to say, Wide open,

the opening 17 vis practically the same as though it led to the atmosphere.

'The carburetor sofar as describedmay be, upto its capacity',used alone to advantage `but it is' particularly desirable in connection with a secondary carburetor which 'is designed to use a less volatile fuel, such as kerosene. The successful burning of kerosene depends on complete atomization. This is accomplished in' this carburetor mechanically by subjecting it to air at high velocity.

It' is desirable, however, to prevent the feeding of kerosene before there is a sufficient movement of airthrough the carburetor to supplya velocity which 'will accomplish this he secondary carburetor is formed in the body 1, apassage 44 being arranged in the body having an axis parallel tothe axis of the passage containing the Venturi tube in.

.6 0 mounting and operates ona seat 49 at the l appel end of this mounting. The valve is carried -by a stern which terminates in ahead 5I and a spring 52 tensioned between `the head 5l and a part of the mounting so |A as -to load the valve and hold it toits scat with a pre-determined pressure'. A dash pot. plunger 53 1s carried by the head 51 and is provided with the usual minute opening 54.'

' 'lhe plunger operatesiu the chamber 55 00- carried at the bottom of the valve mounting and the chamber is closedby a cap 56. 'lhc dash pot operates to prevent violent pulsations of thevalve Vin the usualmanner.`

The opening `to the passage to the valve is restricted by a perforated plate 57` at the ,not the plug 68 and radial passages 70 oon- "l bottom of the passagel the1 perorations 'in this plate-being lso graduated as to operate with relationto the Vvalve in a manner hereinafter described. The valve mounting has an outer ring 44 and a stein carrying portion at the center supported by a spider 58, thus permittin a free passageI of: air. through the mounting to the valve. l

The kerosene receptacle, or oat chamber 3 .is of the usual construction Ahaving the inlet 59, Acontrolling valve 60, stem 61 extending -from the valve, collar 62, levers 63 operating on the collar and a float 64- operating on the levers to controlthe level of fuel in the receptacle, the kerosene level being maintained at the line K-K. Fuel passes from the -uel receptacle through the extension 65 to a hollowv screw plug 66 by' way of the opening 66. The screw plug passes through the extension 65 and into an ai opening 67 in the wall of the carburetor., the screw plug not only forming the connecting passage but also a means of securing the receptacle to the body of the carburetor. A screw plug v68 is screwed into the to of theopening 67 and extends down into t ie' opening in the screw 'plug 66. The

screw plug 68.v has an opening 68% A calibrated 'plug 69 is arranged in the end nect the opening'in the screw plug with an annular chamber 7 1 'formed in the passage 67 around the screw ping. "l i chamber 7 is connected by means of a 5 .esage 752. with a Well 73 formed between the Walls of the valve mounting 46 the passage afl. Spray passages 74 extend from the Well 723 andbelow the kerosene level K through the valve seat 49. These passages are arranged along the sides of the valve seat adjacent tolthe primary carburetor so that the kerosene may be carried into and more thorn oughly :itemized with. the gasoline from the primary carburetor. Small grooves 75 are cut into the face of the valve s'eat, extendn ing to the edge of the valve seat below the point where the passages 74: open through Athe valve seat. The'well 73 is connected by a number of air passages 76`with the sitea tion passage between the restriction formed 35i? by the perforated plate 57 and thc valve 48. The operation ot this secondary kerosene carburetor is as followsi The valve 48 is so Weighted by the spring 52 that it will -not open by reason of the reduced pressure in the chambert until there is a sufficient -reduction of pressure to create a velocity high enough through the restriction formed by the valve vin its initial opening to thoroughly` atomize kerosene. With the initial Tl opening of this valve the greatest restriction is directly at the valve opening but the openings in the plate 57 also form a restric tion so that the air between the Avalve lthe plate 57 is slightly below atmospheric 3* 'tlie'well und rinduces u dow of fuel.

j openingso ere' so large us compared with ,4 "'tli'e is doiuinetell bythe pressure in the churn-` 'lfber betweedthe; vulve und the ,plate 5?.

pessegesgid thet'the pressure inthe Well Consequenilly the pressure controlling the delivery .of sir und fuel the nel level and the fuel iss'wept up and carried through the passages 74: in the form oi s sprs 'While thepassuges M "prevent the over' ow"tliey do not 'present a :means of confining the fuel so es to makefe ccnl tinuou'- column of fuel negutive heed. The fuel and air being sub A' .jected to the seine inducing pressure there vulve but by reason of the restriction in the plete there is not only :i reduction of 1s e ycorrespondingHow of fuel and air to the carburetor.' As the suction increases und the requirements for enfrentar amount of mixture 'ere increased the valve 48 opens and there is u.y 'greater flow of air pest the pressure above the valve but o reduction of pressure below" the vulve' and the velocity ofi air pastthe vulve remeins'or vthis reason more nearly constant. Consequently-there is'the etoiniing effect which is necessary to the vsuccessful use of., kerosene without undue resistnoe tothe .flow of air. l

In the carburetor of the 'rop-ortionshere shown whenrunning :it fu capacity .of gasoline und of kerosene is utilized. This, of course, can be varied somewhutto suit the nature of running' but'it will be observed that in ull slow running Where there is the greatest dit/nity in controlling the motor, the motor is operating entirely on gasoline und this is true whether the throttle is entirely open or partially closed, that is t'o say, the position ofi. the throttle does notfin itselcontrol the time when the seconduryfcerburetor begins to oper-'ate be cause under some conditions a wide open,

throttle wouldbe accompanied with so slow u ilow of-air as to prevent proper utonnzation of kerosene and under these conditlons no kerosene will be delivered; The primar-y carburetor under such conditions has nniple capacity for the purpose.

. inf starting the engine, orf under certain conditions; it muy-'be desirebleto cutout the seconder-y carburetor even. when there is e leigh velocity of sir.' rlliis muy occur with silvery low temperature of engine'und fuel. lllieve provided :for this by providing means wherebythe vulve i8 muy he held in closed position. 'iin if? ez'ztends througjgmhtlie well olf the bony the ccriurctor und neil shove 'the plete 5l is;

, from the is substantially the v-scrne. 'It 'will be observed that thereis nol negative heed' here after the 'initial dif-f l cher e of fuelbeceuse the 'well 73 is below 1 und the suction and consequently e.4

on the valve 48. A lever 78 isv pivotllyv v, mounted byl a. stud 79 secured to the well of the carburetor. .The .lever 78 hes an arm 8@ contacting the push pin 77. The lever 7 8 muy be operated 1n any convenient manner 70 dash, .or otherwise to .manually force the closing ofA the valve 48 so us to throw out of action the vulve 48..

ln order to supply liquid for the dash pot a. passage 58 is errunggfedd in one of the arms 'of the spider 58 carrying the liquid from the. well to the chamber 55. A

The utilization of ey primary carburetor of the type# here shown with u secondary carburetor permits oie very compact con `struction because the absence of usuel parte permits oi vthe convenient assembling of the receptacles 'with the body of the Vcarburetor passages of the primary and seconde, 4 carburetor-s with relation to each other. 'lumber the complete atomization 'of the gusoliherin connection with the kerosene aires' it' possible to introduce the kerosene e 'slower velocity than would otherwise be practical, 'llere is, therefore, a distinct edventage in combining the type of carburetor :Forming the primary and' secondary ele- .ments of. this cerbuietor. a

l. l e'calrburetor, th combination of u Suction passage; a throttle valve in the'pesv segs; u fuelwell; a fuel feedirur means 'de liver-ing 'incl to" the fuel-well from a ccnl' stent iev/el; e spray device leading from beI lowI the fuel level in the `fuel well lto the 4czupiicity relatively to the spray device to lmaintain sub-atmospheric pressure in the fuel well responsive to and. varyingwith the suction effort communicated through the spray passage for inducing a ilow of fuel verying as the :suction fellort for induction oi' sir varies in the suction passage. 2. In a. carburetor,` the combination of a suction passage; a throttle valve in lthe passage; a restriction nearer the inlet than the vulve; e fuel Well; a. 'fuel feeding means delivering fuel to thefuel well. from a constent level; means comprising an obstruc- 12o lowl the fuel level in the fuel. well to the tion varying. the low of air through the restriction und spray devices lcuding'from berestriction in the suction passage below the throttle und to'abcve the fuel level; and

un nir delivery for the fuel Well having an inlet .more remote `from the discharge end of the suction passage than the spray devices A and having e capacity relatively to the spray devises to meistern suontmosphcric issure in the fuel. nell 'resnonsive tu l the suenen coin means delivering vin the suction passage.

cated through the spray passage fof' in# ducing a flow of fuel varying .as the4 suction.

'having an inlet more remote from tixediacharge end of the suction passage than thev s rag, device and having a capacity relatively to the spray device to maintain subatmospheric pressure in the fuel ,well responsive to and varying with the suction effort communicated through the spray pesi -sage for inducing a flow of fuel varying Vas the suction effort for induction ofair varies 4. In a carburetor, the combination of a suction passage; a throttle valve iii the pas.

sage; a restriction in the forni of a Venturi tube in the passage nearer the inlet than the throttle valve; a fuel Well; afuel feeding means delivering fuel to fthe fuel vvell from av constant level; a spray device leading from below .the fuel level in the fuel 4 .the 'suction passage.

Ithe spray well to the suction passage-and to. above the fuel level; and an air delivery for the fuel well having an` inlet more remote from the vdischarge end of the suction passagel than the spray device and having a capacity relatively to the spray device to maintain sul@ atmospheric sive to and varying with the suction effort communicated through the spray passage for inducing a flow of fuel varying as the suction eifortfor induction of `air varies in 5. in a carburetor, the comliiination of a suction passage; a throttle valve in the passage; i, restriction nearer the inlet end of the passage than the throttle valve in the form of a 'Venturi tube; a fuel ivell;a fuel feeding means delivering fuel to the fuel Well from a constant level; spray devices leading from below the fuel lcvQl inthe fiel well and terminating in a nozzle e tending from the Wall of the Venturi tube into' the passage; andan air delivery for the fuel well having an inlet more remote from the discharge end of the suction passagethan tively to the spray devices to maintain subatmospheric pressure in the fuel we ll responsive to and varying with the suction effort communicated through the spray passage for inducing a flow of fuel varying as the snetioneffort 'for induction of air varies in the suction j .aisstuga a spray device leadin pressure in the fuel well respon'-` meuns for devices and having a capacity relamessage llxn a carburetor, the combination ofte suction. passage; a throttle valve in the i sage; a 'fuel well; a fuel feeding m'e'ansrdes liveringfiietto' the fuel Well from a 00nstant leveli a spraying device leading from below the fuel level in .the fuel well to:the

suction passage below the throttle and to abve tlie`fuel level; an iair delivery for the fuel `ivell having an inletanore remote fromIv the discharge end of the 'suction passage than the spray dev'ie and having' a capacity rela-- -tively to the spray 'device to maintain sub- .atmospheric pressure in the feed Well responsive to and varying with-the suction effort communicated through the spray passage for inducing a How of fuel varying as the suction cli'ort for induction of air varies in the suction passage; und an idling passage leading from the well to a point in the suction passage nearer the discharge end than the throttle.

7'. In a carburetor, the combination of a- -suction passage; a throttle valve in said passage; a yielding valve in said passage nearer the inlet than the throttle valve; a

fuel well; means for delivering fuel to said wellfrom a constant level;-a spray nozzle leading from the well to the restriction formed by the yielding valve; a restriction nearer the inlet to said passage (than the yielding valve; and an air passage leading to the well from the suction passage at 'a point bctween-thc yielding valve and the last'namcd restriction.

8. In a carburetor, the combination of'a suction passage: a throttle valve in 'Said passage; a yielding. valve 'in said passage nearer the inlet than the throttle valve; a fuel well; means for delivering fuel to said well/from a constant level; a spray nozzle leading from the well to the restriction formed" hy the vielding valve; aV restriction nearer the inletthan the yielding valve, said yielding valve and restriction maintaining a substantially uniform velocity past the yielding valle; and an air passage leading to the well from the suction passage at a point betivcen the yielding valve and the lust nunicd'rcstriction.

i). The combination of a primary carbureior comprising a first suction passage, and delivering fuel to the first suction passage; and a secondary carburetor comprising a second suction passage, afuel Well; a spray nozzle leading from the fuel well to the second suction passage; and means for delveringvair to the fuel well from the sec- Iii-st suction passage; and a secondary saltcle, a second suction passage, a gliel `ng valve opening only at a pre-determined solo tion 'in said second suction passage greater than a functioning suction on the'priinat.

carburetor, a fuel w'cll, a spray notizie lea if# ing from the fuel woll to tile restriction formed by the yielding valve, and means for i0 delivering-aiuto the fuel-well. `11. l`li`e combination of a primary carlmretoi' comprising a first fuel receptacle, a first suction passage, and means for deliver- 'ing fuel from the first fuel receptacle to the first 'suction passa-gegend a secondary carburetor comprising a second fuel rece ta` cle, a second suction passage, a yiel ing valve opening only 'at a predetermined suction in said` second suction passage 'greater than a functioning suction on the prima carburetor, a iuelwell, a spray-nozzlerlea ing from the -fuel Well to the restriction formed by the yielding valve, a restriction in the second suction passage nearer tlio inlet than the yieldingwalf/e, and an air passage'leading from the second suction passage tothe feed well. #v

12. The combination oi 'a primary car buretor comprising a first fuel receptacle, s

.3U first suction passage,'a nd means for delivern ing fuel from the irst fuel receptacle to the first suction passage; and a secondary carburetor comprising a second fuel receptacle7 I a second suction passage, a yielding valve opening only at a predetermined suction in said second suction passage greater than a functioning suction on the primary' carburetor, a fuel well, Aa Aspray nozzle leading from the fuel wellto the restriction formedl 4" by the yielding valve, a restriction in the second suction passage nearer the inlet than the yielding valve, and an air passage leadn ing to the Well from the second suction passage at -a point between the yielding Valve aa and the restrictionto the feed well.

l 13. ln a durliiuretor, the combination of a main suction passage; a throttle valve in said.:

passage; a prn'nary carburetor discharging tossaid main suction passage comprising a fuel receptacle, a first suction passage, and `means for delii'ering fuel from the fuel le ceptacle to the first suction passage; and a secondary carburetor discharging to the main suction passage, comprisingv a second fuel receptacle, a second suction passage, a

\ yielding Valve opening only at a predetermined pressure in the main suction passage greater than a :functioning suction on the primary carburetor. a fuel Well'. a spray n oz- Zle leading `from the .well to tlierestrictton formed by the yieldingv valve. a restriction nearer the inlet to said second-*suction passage than the yielding Valve, and an air connection between the Well and said second onction. pai buretor comprising a second i'usi rece' is@ cliaiygingoto giro fuer receptacie to the -f 'f sugo; and secondary sa `main suction passage; a throttle Vais main ti said nas-sauge pricing :tust passage, and mean.

to the inain suction ing a secondi incl t1on passage,

is s

yielding salve opening ouiy .at a prefieterinznati pressure. in tiie tnaii'i suction pass.n greater'tiiaa a functicniaa suction on t. carburetor, and. W means :tor delivering fueldroin the second receptacle to tl'ie restriction termed yielding 4valve at a point, the side i i valve adjacent .to .the primary cassure 15. in a carburetor, the combinatie passage; a, priirnaryv carburetor disc to said main suction passage cor-zip. fuel receptacle, first suction pas .es means *for delivering fuel trom tile r ceptacle to tlie i'irst suction passar; secondary carburetor diselif'rg I main suction compi sin fuel receptacle, a seefind sucti yielding saire ope mined pressure tl greater than a iiunctio .i primary carburetor, rituel Wea, zles leading from said fuel "if striction formeel by tlie yieic tlie side oit said #faire adjaceii mary carburetor, 'a restriction suction passage nearer die inn,J sage than the yielding valve, and .an nection between tlie'well and s suction 'passage between 'tile yiei and said restriction..

ld. a mais suction p. e; a titre ce said passage; a pr ary cariiureto ing a suction passage listing a ra the forni of a Venturi tube., a fuel i zles leading from the fuel recept the fuel leirel. through the wallso r, tile coinii" turiiuloe and into .the'air cui y p` g through the-Venturi talee, an air sonner. .1an

o f v s I d ai' Krom sam sec-ono. fuel Well to the restriction :formed by the valve, a second fuel receptacle having e.. connection leading to said second well adaptedto feed fuel to thewell by graveonnection .fmtawme gtrictom f j rn' n, carburetor, the combination of a auction. 'passa e having a closure shoulder thereon; n rave mounting adapted to form n eeem'e with sai fshoulder and to form a.

well between Hits* wallsfand the nelle of the suction passage; a yielding valve carried by the valve mounting; a spray nozzle arranged l v.

in the valve mounting andvleading from the. well to the restriction formed by the yield-- ing valve; a restriction for the suction as sage carried by the valve mounting; an an an" connection to the well havin an mlet between the yielding valve and t e reStI'ic-Vv tion carried by the mounting. l In testimony whereof I have hereunto set my hand.

FRANK H. BALL.