US1335389A - Casbtjbetes - Google Patents

Description

C. L. RAYFIELD.

CARBURETER.

APPLICATION HLED SEPT 15. 1913.

1933353890 Patented Mar. 34]), 192(1 3 SHEETSSHEET 1.

IIMIHW,

I ulml C. L. RAYFIELD.

CARBURETER.

APPLICATION FILED SEPT 15, 1913.

1 83355 390 Patented Mar. 3(0 192411,

l on. i A. .ziL/

SIS, ASSIGNOEL T8 F ILLL FINDEISEN E:

CAEBURETEB.

Application filed September To all whom it may concern:

Be it known that l", CHAnLns L. RAYrnaLD a citizen of the United States, and resident of the city of Chicago, in the county of Cook and State of Illinois, have invented certain new and useful improvements in Carburetors; and l do hereby declare that the following is a. full, clear. and exact description of the some, reference being had to the accompanying dmivings and to the nuinerels of reference marked thereon. which form a part of this specification.

invention relates to carburetors end for its object to provide certain inn struction and operahas proveinents 1n the 001 tion of the slimees l he heroine lla delii'ntel pointed out and claimed, reference being lied to the accompanying drawv 7 i 1g. 5 is a fragmentary elevation oi; v. emu actuating means for opening the supply valve.

Fig. 6 is an enlarged section taken on line 66 of 2, with parts in elevation.

Fig. 7 is a section token on line '?7 of Fig; S3, with parts in elevation.

A 8 is a. top plan view or" the conical velve element.

7 is an enlarged freggmenterv detail oi? the adjustable mounting of the needle valve closure.

As shown in the drawings:

The carburetor comprises en integral cast in ay edordinrg a float feed chamber L an air inlet chamber 2, e mixing chamber 3, end 2211 outlet chamber All is admitted to the chambers 2, end 8. hv means o-l an air inlet pipe which point opposite said chamber 3, hes .ecured in sin enertured lug}; 6. formed on the outside thereof e fixed rod 7 on which is slide r a puppet velve 8, held closed by a helical spring 9. hearing against e not 10, on said rod P Specification. of Letters Patent.

it is sometimes desirable to heat all the air enterinp' the carburetor, said inlet passage 5 zifi oros it convenient means for introducing the heated ir to the several inl ts. end with this exception has nothing Whatever to do With the lunctions of carbiirzition and could readily be dispensed with. The air intake pipe 5 communicates with said charm her 3 through said valve 8 by means of an auxiliary passage 11 that when the draft exerted the engine becomes su'liicicntlv strong;- zis to require a. greater air so )olv J I 1 then that Tlli'fllSllGd through soul ('llitllllh, the spring); resisted vzilve fl. opens to ment the low oian".

Threaded into the lower end of the liout "feed chamber 1., is a nut 12, aperture d and internally threaded to receive fuel supply pine 13 and at its upper end eli'ordinp; a valve for e needle 'elve l i which is rigidly engaged in a double lie element 17;, slideloly mounted in it cover 16 oi the dost teed rhzunher. heed 1'7. is pro ided on the upper-extremity of said needle valve and pivotally mounted upon one s de oi? u smell casing 18. is (I crank l9 edu-pted to beneath said head 17. to lift the needle valve. though noru'ielly impelled out of contact therewith by means of a spring pressed detent 20.

For the purpose of entorneticallv operat ing' said needle valve to maintain a constant level oi? tuel in said dost teed chamber a. pziir of downwardly flrojecting lugs 21, are "provided on the under side of seid cover 16, end journeled therein are levers 22, the inner ends thereoi rounded and adopted to engage hetween the flanges on said element 15. end with the outer ends thereof weighted with the enlarged hell members whi h normellv rest on the upper su face of e flout The fleet is slideblv mounted on said needle valve so that an upward movement of said float ceuses e corresnondino downward movement of the needle valve to close the some. and with a lowering; of the fleet. due to dro i in the level of the flu d w thii the lostleed chamber. he weighted bell nienihers serve to open the needle valve to admit fuel into the chamber.

A. combined fuel su o ilv and dash pot chambe 25, is formed integrally in the hotom of said chamber 2, and: communicates with said float teed chamber 1 by means of a passage 25. Threaded in the upper wall of said chamber 25, is an upright tubular member 26, having upper and intermediate heads 27, and 27 threaded thereon, thus permitting adjustment of the two to vary the distance therebetween. The portion of sad member 36. between the heads 27 and 9 7, prmrided with large and relatively long slots 26. for a purpose hereinafter described. Slidably mounted in said tubular element :26, is another tubular member 28, having a piston 29, at the lower end thereof fitting in said chamber and. with a plu- "ality o't apertur 28. positioned above said piston. Secured on said tubular element 28, at the upper end thereof is a hollow double conical member designated by the refer nee nun'ierals 30, and 31, respectively. the upper portion 3 adapted to seat on the tn per-ed edge of the easin between th cham hers 3. and -l;. and tl lower men oer "3 adapted to lit- Within the annular tla are 31 j rovided between the chambers 2 ant Tl e upper portion 30. said valve m niv a s o l her is open. as sin all in .115. o. ano me lower portion 'lS provnhEd vith plural ty ot apertures 32. and said stein element L8,

is provided with apert ires 33 positions ,1 regmxer with Q said slots 26. to flow ol hydro- 2rbon i thorethrough. Jr in h elenient 28, is adapted. when vereo POSI- tion, to rest upon a ;el.at1vely long needle valve lcsure element- 35. wh :l is inour ed on a lev ..r l joint, said element 34-. being held upv'arr. in position by a pivoted secured on said lever e closure element 3'1. is so slightol opening effected by e tubular element 28 t l i t 3:). by means ot a ba l and socl'e neretrom very much less than. that o't tie normally open inlet ports The lower end of said sham ver 2:), closed by means oi. a 1 11i 37. intern threaded to receive a drain nipe 38. may be fitted with a pet cook. thou shown. tor the purpose ot draining; the same when. desired. Said lee-r1133. is suitably pivoted on a pin 39. threaded a horizontal tubular extension ld i-he earlnu'eter which communicates e said chamber 25, the outer end of said tubular extension being closed by means of a thiraded plug ll.

Also integrally formed on a central portion of the carburetor and co:nnnniicatingi with said horizontal tubular extension 40, is a cylindrical element 42. havingan actuating piston mounted on a rod A l. slidable therein. sa d piston 43. normally reslin on the outer end of said lever a notched head 45, is rigidly secured on the upper end of said stem ll and is adapted to be engaged by a spring pressed detent a. lo. vv lacuis mounted in a rotatable levei :14.

An ap ertured plug 48, is secured in said cyl indrk (ii if, one:

ant said lever 35, whereupon the needle valve closure 3 drops downwardly away from the tubr element 28. permitting a llow hvdro-rarbon tnerethrouggh.

This particularly desirable just at the starting of an engine. as a quantity of fuel will thereby be drawn upwardly through said tubular element 28, one sprayed within said conical member 80. which, being in closed position vvi ture to be drawn 1 of the head 27. an l permit a very rirh miX- dly around the edge vrough the upper end L l oi? said member 30. and thence to the a anltold of the engine. A sleeve 49. loosely engages around the cam engaging portions oi the elements l7. and 48.

Auxiliary means operating independently Off the sleeve valve is also provided for initially priming the manifold ot the engine at the moment oi starting the same.

This comprises a tubular element owned on one side of said float chamber ano con'nnunicatinn' therewith by means of a pi. go 54-. A ball lies within said tubular member to normally close said passage from the ii at chamber. and a piston 56. normally rests thereon to maint ain, said ball in closed position. A. lateral extension 57. having a passage 58, therein. communicating with said. tubular element is. iorined on one side of said tubular e ement 53, said extension 57. having; an enlarged chamber therein, connnunieating with said passage 58. though normallv closed tl'lerefroin by means of a ball ('30.

Threaded in the upper end of said oXtennisms ot the carlnirelx r. Said piston valve 56. as shown in Fig. 7, in its lower position also r-tl'Yk'SS to close the 58, so that drat't exerted bv the engine :anhave no oi upon the ball to raise the same permit a flow or hydro-carbon unless piston valve 36. is raised. DL-i'UObC- ojt' raisins saul )lStOD 56 e sten s m l V a 11/ 5G. is rigrdl y connected. thereto and. extends For the l. l I

lid

upwardly through the cover 16, oi said float 'leed cl'ianiber into an auxiliary casing 62, and is provided with a head 63, udapted t engaged on its under surface by means i: an actuating lever 6 3 any suitable actuating mechanism for the operator,

shown in the upper portion of the :eter above the outlet chamber 4, a "ternary throttle or outlet valve 65, P ovidel which controls the tlow oi mixture from the carburetor. An attaching flange 66, extends outwardly along the upper portion of the carburetor affording a means oi? attachment therefor to a manifold oi on engine, and (it the points indicated by the roit'erence numerals 6?, the carburetor is shown as water jacketed to keep the device wa m i" r desired.

At the entrance to said air inlet chamber 2, an integral extension 68, is formed in the lower portion of the carburetor which commmiicates with said dash pot chamber 25, by means oi o. passage 69 end cou'm'iunicuting in said extension (38, and extending up w rdl v into said euxiliary air inlet passage 11, is a pipe or nozzle "Z edonted to introduce u spray oi? hydro-carbon into the uuX- iliery eir puss e 11 and serving also a v for su 1 ine an extra amount of el when the valve 8 is opened by suction.

The operation is as follows: a

It is uppurent f om he construction that the cerhureter is ded with two air ports, one of which is more or less open at z rgine is running; and

all times when the c the other norma v closed but serving to introd uce an auxiliary .air supply when its valve 8 opened under increased suction oil the engine. Between the air inlet and mixchznnbcrs oi? the :nii'lniretei' the double conical valve 3 -31... if provided, the upper .ber 30., seating upon tire tapered portion of the casing; between chambers 3, and lower conical portion 31., serving couinjiunicotirui between chambers i", and 3, a though oi eoiiirse 2:, flow oi? air may tul'c p zice upwardly from said chumhe.v 2, tlrough said co cal velve member, end likewise around the exterior thereof when the game is raised.

or the pijirpose oi" preventing an unre ilow oi? a: through the conical SU -31 when the same is in the lower position, a head 2", mounted to close comeuoiczitiou tween the interiors oi? said respective CClllSiil valve elements 30. and 3' apertures 33, and through the opening in the upper end thereof, and, owing to the fact that said tubular element 28, is coir nected to said valve member *31, an elevation oi said valve will likewise cause an elevation of said element 28, away from the closure element thus permitting a greater quantity of lrvdro-curbon to flow therethrough.

Thus the valve member 30-31, is the moving element of two air valves afforded by co-action oi said member with the seat 30 end the head 27 and flange 31 The head 27, is never completely closed, whereas the valve seat 30?. is normally closed. The valves oi which the elements 27 and 31, term a pelt constitute the main air inlet system, and either may have its cooperating parts loosely fitted. so as to permit some air to flow pit 5 it when valve 30?, is closed. while the other is a closer fit and completely cuts oil the air supply through its respective port except when suction is sufficient to open it' I p l he action of the piston 29, in the dash pot chamber upon the double hollow valve member -30--3L to which it connected, is a retarding action. serving to retard the movement oi said member 30-31, in its movements as differentiated from the action of a resisting spring which is sometimes used in carburetor structures. That is to shy, to retard the movements o1 the valve member 30-3L is to delay the movements thereot.v but not necessarily restrict the movements except as to the matter of the period of time involved. The time involved may be lengthened due to the retarding action of the 1 'ston in the dash pot. but the piston in the dash pot does not prevent the full movement taking place. On the other hand an opposing or resisting spring does not retard the ix'iovenient, but does provide a balancingforce. and thus determines the poin where a given "force will meet an equal opposing force and thus set :1 limit to the movements of the iueniliior with which the spring is associated.

The retarding element does not react to move the valve. but resists its movement. It tends to maintain a i'ueijihunicel status. l he whole dosh pot system so constructed that serves the double purpose of retarding the opening}: of the air valve and pumping 'luel, uniiler pressure throuogh the fuel sup plv system.

Acting" in its function as e retardingmeans. when the throttle is suddenly opened the air inlet rescuing lags behind th mi ture ou.l='- t opening and the strong .iction existing: above the throttle when it is partially closed is suddenly transferred to the interior oi the carburetor when the throttle is thus opener; and is not immediately relieved by a. corresponding opening of the all.

inlet valve, so that during the period occupied in accelerating the motor, a suction stronger than normal for the various speeds attained is effective on the ets.

As already mentioned, one of the principal features of this type of carburetor is the introduction of fuel into the proper chainbers by mechanical means augmented, of course, by the suction or draft of the engine, the actual mechanical transference of fuel being effected by the piston in the dash pot connected to the conical air valve of the device.

Assuming the valve 30 31 to be in closed position, if the throttle is opened and ti .2 engine turned over said valve 30 31, will immediately tend to jump upwardly with a sudden movement, but. of course, retarded by the piston in the dash pot,

u nereupon the fuel. contained in the dash pot chamber above the piston 29, will be placed under pressure thus causing the same to flow into the tubular element 28, through the apcrtures 28 and outwardly through the apertures The movement of the piston causes the fuel to be sprayed outwardly with considerable force, and the pressure will also be transmitted to the chamber 68, thus causing the fuel to be also sprayed through said auxiliary nozzle 70.

The initial heavy charge of fuel introduced into the proper chambers in this particular type of carbureter is particularly well adapted to permit an engine to pick up or accelerate in a short space of time. An import-ant test determining the sensitiveness or responsive action of the :arbureter is to open the throttle wide when the engine running at low speed in order to determine the shortest time in which the engine will pick up to its highest speed under a. certain load.

It has been found in this particular type of carbureter that the initial movement of the valve member 30-31 causes the fuel to be actually pumped under pressure and sprayed into the proper chambers. with considerable force so that with an instant opening of the throttle valve the carbureter responds and does not lag, for a period of from five to ten seconds as has been found heretofore, until the automatic mechanisms of the carbureter adapt themselves to the change in conditions.

Of course, the pumping or mechanical action which. introduces the fuel is only momentary, but is sufficient to cause the engine to respond to an instant opening of the throttle, thus allowing the other mechanisms of the carburcter to adapt themselves to the new conditions, a sufficient amount of fuel having been supplied and in quantities to run the engine during the interval of time required for the carburetor mechanisms to readjust themselves.

Thus the quantity of hydro-carbon introduced into the carburetor is governed by the draft of the engine. lVhen the load upon the engine becomes very great and the draft increases, the automatic valve 8. opens to supply sufficient air to provide for the increased How of fuel which takes place through said nozzle 70.

The threaded connection between the stem of said notched head 45, and the lever 47, permits an adjustment to be effected to regulate the opening and closing of said tubular element 28, by said closure 34., to suit the conditions. Likewise the adjustment. of said automatic valve 8, may be changed by suitably manipulating the nut 10, on the inner end of said stem '7. Other adjustments of the various parts will be evident from the description so that it is readily apparent that the carbureter is adapted to practically any field of operation or use requiring only a preliminary adjustment therefor.

I am aware that various details of construction may be varied through a wide range without departing from the principles of this invention. I therefore do not purpose limiting the patent granted otherwise than necessitated by the prior art.

I claim as my invention:

1. In a device of the class described. a float feed chamber. a mixing chamber, a fuel inlet leading from said float chamber to said mixing chamber, an outlet chamber. an inlet chamber for the mixing chamber. an auxiliary air valve opening into said mixing chamber. and a double valve member intermediate said inlet chamber and said outlet chamber adapted to open proportionately with the draft exerted by the engine.

2. In a device of the class described a float feed chamber, an outlet chamber, an air inlet, a double valve interposed between said outlet chamber and said inlet, a tubular valve stem connected to said valve and adapted to receive a supplyof fuel from said float feed chamber, and an adjustable closure for said tubular stem adapted to permit a variation in the opening thereof when said tubular member is lifted to permit a flow of hydro-carbon therethrough.

3. In a device of the class described a double hollow valve, a tubular valve stem connected thereto adapted to move therewith, a piston connected thereto adapted to move therewith, and means introducing hydrocarbon through said tubular valve stem into the interior of said valve.

4. In a device of the class described, a float feed chamber, an outlet chamber, an air inlet. a hollow double conical valve member interposed between said outlet chamber and said inlet, a tubular valve member in connection with said float chamber connected to said valve chamber and adapted to move therewith, a closure tixed in adjusted accuses hydro-c inlet, let, a double hollow con cal puppet valve mounted in said carburetor between the outlet chamber and said normally open air inlet a valve in on said conical valve, and means int oducing hydro-carbon fuel through said valve stem into said hollow conical valve.

6. in a device of the class described an inlet and outlet therefor, a hollow double valve .inber interposed therebetween, and means ior introducing hydro-carbon fuel into the chamber formed within said hollow valve member.

7. in a device of the class described, a float feed chamber, an air inlet chamber, an outlet chamber, a mi 41g chamber intermediate said air inlet chamber and said out let chan'lloer, a double hollow valve member closing the respective openings between said icspec e outlet and inlet chambers, and

'd in 'np' chamber, and means introduc- 3mg llYCll'O-(ATDOD fuel from said float chamber into said mixing chamber tirough said hollow valve member.

in a carburetor a float feed chamber, an outlet chamber, an air inlet for said carburetor, a gravity acting normally closed double valve between said outlet chamber and said air inlet, a hollow valve stem for said valve, a piston on the end thereof, a dash pot adapted to receive hydro-carbon fuel from said float feed chamber and to receive the lower end and piston of said hollow stem therein, and a valve closure in said dash pot adapted to regulate the quantity of fuel drawn upwardly through said hollow valve stem.

9. in a device of the class described a car ureter, a float feed chamber therefor, a mixing chamber, an air inlet, a dash pot in the lower end of said carburetor adapted to receive hydro-carbon fuel from and communicating with said float feed chamber, tubular extension threaded on said dash pot, a hollow valve stem slidable through said tubular extension and projecting into said hydro-carbon dash pot, a piston on the end of said stem, a double valve member on the upper end of said stem adapted to move said stem when said valve is moved, and a closure adiustably mounted in said dash pot chamber adapted to regulate the opening into said hollow valve stem to permit a flow of hydro-carbon fuel therethrough.

10. .lln a device of the class described a float feed chamber, an outlet chamber, an

air inlet, a suction operated double valve member mounted intermediate said outlet iflldllllJOl' and said air inlet, a hollow valve stem there or, means introducing fuel throi s hollow valve stem, and an s are through double valve to :o-cirbon mixture into in a device of the class described a 'eed chamber, a dash pot chamber, in .nicatiou therewith, an auxiliary rbon nozzle, passages connecting said cash pot chamoer and said hydrocarbon nozzle one to another to permit a flow of hydro-carbon fuel thereinto, an auton'iatically operating double valve member, a hollow vale stem thereon projecting into said dash pot member, a piston thereon, and a closure adapted to project into the lower end of said hollow valve stem to control the flow of fuel thereinto and into the device.

12. In a device of the class described a fuel supply chamber, a dash pot chamber communicating therewith, an outlet chamher, a mixing chamber, a double automatically acting}; valve i'uounted to control the flow through said mixing chamber and into outlet chamber, a fuel. supply valve adapted to feed fuel into said mixing chamber and connected for operation with said automatic valve, and means on said fuel vale to cause an augmentation of pressure in the fi 1 supply valve with movement of i d auton'iatic valve to spray the hydro-carbon fuel under pressure into the mixing chamber.

In a device of the class described a carbureter having a throttle valve, a fuel supply valve, and a unitary double hollow valve member, said member by movement serving to open the fuel supply valve to admit fuel into the interior of said hollow valve member.

le in a carburetor of the class described plurality of fuel supply means disposed at different points and at different levels, a hollow valve member, and means associated therewith acting when said valve member is operated to introduce fuel under pressure to said different supply means.

15. in a device of the class described a mixing chamber, a float feed chamber, a dash pot connected with said float feed cl amber, a double automatically acting v. "econtrolling the inlet and outlet from said mixing chamber, a fuel supply valve connected for operation by said. automatic valve, an auxiliary fuel supply chamber connected with said dash pot, a nozzle secured in said auxiliary chamber and pro jet-ting into said mixing chamber, and means secured on said first mentioned fuel valve for forcing hydro-carbon fuel therefuel valve with an initial opening of said valv i i nibei l a device of the class described a I. float feed chamber, a mixing chamber, a dash pot in communication with said float feed chan'iber, a fuel valve, a piston on said fuel valve in said dash pot chamber, and a. double valve m mber adapted to move said fuel vllve lcmert to i zcause said piston to force fuel theretl 'ough under pressure to said mixing chamber.

18. In a device of the class described, a

double automatically acting valve member, a fuel supply "alvc, and means introducing fuel through said fuel supply valve in excess of that ithdrawn by aspiration when said automatic valve actuated.

19. in a carburetor of the class described a hollow valve, fuel inlet means therewithin, fuel inlet means adjacent said valve, and mechanism operatii to force fuel under pressure through said respective fuel. inlet means.

20, ln a device of the class described, a hollow draft operated double valve member, fuel inlet moans disposed therewithin and movable therewith, and mec .mism operatcd by said valve member to force fuel through said inlet means under pressure into the interior of said valve member.

21. In a device of the class described a hollow draft operated valve, inlet fuel means disposed thcrewithin and movable therewith, stationary fuel inlet means, and mechanism operated by said valve to force 'luol under pressure through said respective fuel inlet means.

In a device of the class described a mixing chamber having inlets and an outlet therefrom, a double valve member controlling said outlet and one of said inlets of said mixing chamber, another valve control line; another of said inlets to said mixing chamber. and means introducing fuel for carburetion of tlie air into said mixing chamber.

In a carbureter of the class described the combination of a mixing chamber, an inlet chamber therefor. an outlet chamber communicating with said mixin chamber, a valve member mounted beneath said mixing chamber controlling the respective pasof connnunication between the inlet and outlet chambers of the carburetor with said mixing chamber, a plurality of fuel in let means, and mechanism operated by Said valve member to introduce fuel under pressure through said respective fuel inlets.

Q-l. lin a carlmreter having an air inlet and a throttle controlled mixture outlet, suction operated means for varying the area of said air inlet. two fuel inlets, one of said fuel inlets being permanently open, means controlled by said suction operated means for varying the discharge capacity of the other of said fuel inlets, and a liquid dash pot for retarding the movements of said suction operated means.

25. in a carburetor, a carbureting chamber, an air inlet, a fuel inlet of fixed capacity, suction operated means for varying the area of said air inlet, a dash pot supplied with liuuid fuel, a tubular member communicating the movements of said suction operated means to the piston of said dash pot, a fuel valve in said tubular member, means for varying the capacity of said fuel valve by the movements of said tubular member, an orifice in the side of said tubular member for discharging fuel into said carbureting chamber, and manually operated means for adjusting said fuel valve.

26. In a carburetor, two air inlets, a fuel inlet for each of the air inlets disposed in the path of air entering its respective air inlet, a suction operated valve for one of said air inlets, a stem for said valve, a fuel conduit in sa l stern. and n'ieans for retarding the i'novement oi f said valve.

27. In a carburetor, two air inlets, a fuel inlet disposed in the path of air entering each air inlet, suction operated means for varying the area of one of said air inlets, means rigidly attached thereto for varying the discharge capacity of the fuel inlet associated. therewitl'i, and means for retarding the movement of said suction operated means.

28. In a carburetor, two air inlets, two fuel inlets at different points within the carbureter, suction operated means for varying the area of one of said air inlets, a cylinder supplied with liquid fuel, a piston in said cylinder, a tubular member communicating the movements of said suction operated means to said piston, a fuel valve in said tubular member, means for varying the capacity of said fuel valve by the movements of said tubular member, and manually operated means for adjusting said fuel valve.

29. In a carburetor, two air inlets, a fuel inlet for each of the air inlets disposed in the path ofair entering its respective air inlet, a suction operated valve for one of said air inlets, a stem for said valve, a fuel conduit in said stem, and means for retardin the n'iovement of said valve.

30. In a earbiu-eter, the combination of a mixing chamber, a valve for regulating the draft through the mixing chamber, float feed means for providing a normal supply of fuel to the mixing chamber, and means for injecting fuel in excess of the normal supply into the mixing chamber comprising a fuel chamber, a member actuated by the opening of the aforesaid valve to apply p sure to the fuel in the fuel chamber, and a stem connected with the said member and provided with a passageway therein having an outlet therefrom into the mixing chamber for conducting fuel under pressure into the mixing chamber.

31. In a carburetor, thecombination of a mixing chamber, a valve for regulating the draft through the mixing chamljier, float feed means for providing a normal supply of fuel to the mixing chamber, a fuel reservoir, and a pump connected with said valve and adapted simultaneously to withdraw fuel from therescrvoir and expel fuel to the mixing chamber to augment the normal supply of fuel as the valve is opened.

in a carburetor the combination of a or 1g having a mixing chamber, a valve con rolling the air inlet to the mixing chamber, a nozzle for discharging fuel into said chamber, means controlled by the movement of said air inlet valve for varying the d arge of fuel, and means for tem mrarily increasing the discharge of fuel through the nozzle independent of the position of the air valve.

In a carbureter the combination with a casing containing the mixing chamber, of a valve controlling the air inlet to said cl'iamber, a nozzle for discharging the liquid fuel into said chamber, means for varying the flow of the liquid fuel with each change in position of the air valve, and means for additionally increasing the flow of the oil upon a sudden opening ofsaid air valve and for restoring the normal flow upon the cessation of said sudden move ment.

3%. In a carbureter, the combination With a mixing chamber and an automatic valve for controlling the air inlet thereto, of a passage connecting with said mixing chamber through which air is normally drawn, a dash-pot for retarding movement of said automatic valve, and means utilizing the pressure in said dash-pot for raising the level of the oil to said air passage, whereby auxiliary oil is disclmrged in the mixing chamber.

In a carburetor, the combination with a mixing chamber, of an automatic valve controlling air admission thereto, said valve having an oil passage opening into the mixing chamber, a chamber with Which said passage communicates, metering means controlling such communication, a piston in the second-named chamber connected with said automatic valve, a fixed means for by-passing oil into the mixing chamber under pressure of said piston,

in testimony whereof l have hereunto subscribed my name in the presence of two subscribing witnesses:

CHARLES L. RAYFIELD.

Witnesses H (,rmnnns Vi. lriILLs, Jr, GEORGE E. MOORE.

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