US1310432A

US1310432A - Carbtireteb

Info

Publication number: US1310432A
Authority: US
Publication date: 1919-07-22
Anticipated expiration: 1936-07-22

Description

(2.1. PEMBROKE.

CARBURETER.

APPLICATION meu JUNE15, 1914.

Patented July 22, 1919.

2 SHEETS-SHEET 2.

FECE.

CHARLES J. PEMBROKE, OF ROCHESTER, NEW YORK.

CARBURETER.

Application filed June 15. 1914.

lie it known that l. (Huma-:a J. PEM- iiiioiiic. a citizen ot' the l'uited States. residing aty Rochester. in thi` county ot' Monroe and State of New York. have invented certain new and useful Improvements in (larhureters. of which the, followi g is a specification. 'i

The object of this invention is to provide n new and improved forni of carbui-eter.

This and other objects of this invention will be fully illustrated in the drawings. described in the Specification and pointed outy in the claims atthe end thereof.

In the drawings, Figure 1 is alvertical cross section ot' my improved carburetor.

Fig. is a top plan view ot' the valve seat. l

Fig. 3 isa detail view of thonieehanisin for operating;r the throttle valve and Fig. -l is a section on the line 1"-4 et' Fig. 3.

Fig. 5 is a horizontal section on the line .Vix-(5X of Fig. 1.

Fig. 6 is a detail view of the link for hiireter in which the tapered pin is attached' to the valve instead ot' the baille and in which the small supply of air is admitted through or around the air valve 39.

ln the nccoinpaiiying drawings, like reierence numerals indicate like parte.

In the drawings. 1 indicates n float chainbei' of the carbureter havi'hg the drip cock Q threaded into the bottom.thereof and having a guide '3 supported therebyin which guide are the openings` 4,4. through which the gasolene or vater can enter the drip cock from the bottoni ot the float chamber. The bottom oic the float chamber is shown depressed so that, water or any other liquid may settle therein iiermitting itI to he easily drained otl' through the drip' cock. On top of the float chamber is a cover plate 5 fastened thereon by screws (i. The cover plate 5 is provided with the neck 7 which is suitably threaded to receive the sleeve 8 which sleeve is provided with the hexagon head 9. A locknut 10 surrounds this sleeveso that Specication of Letters Patent.

Patented July 22, 1919.

Serial No. 845,259.'

itI can be clamped in the neel( 7 at. any desired height.

inside the sleeve 8 is another Sleeve 11 having a shoulder 12 on the lower end thereot' which limits its upward movement. On thisL sleeve 11 is threaded the elbow 13 with which the sleeve 11 rotates. The parts are so dimensioned with regard to each other that the elbow 1 3 makes a gas tight fit With the sleeve 11 and Still leaves sufficient cleer` ance between the ehoulder 12 and the Sleeve them forming a valve seat.. f

inside. ot the floatchamher of the e biireter in provided the iioat 1G havii stein 17 extending therethrough which at the bottom extends into the guide 3 to. iing part of the drain cock and at thetop extentll into the large opening 15 of the sleeve 11. .The top of the stem 17 is tapered or coueshaped and forms a valve 17 ivhieh engages with the shoulder or valve Seat at the bottom ot' the small opening-14.

At the bottom oi" the float chamber is peovided an extension 1S in which is a passage way 1S extending horizontally therethrough. through which gasolene iS aflniitted to the spray nozzle. lso integral with thia` part ot' the earbureter is the extension 19. provided with' a warm air intake Q0. This extension is provided with a shoulder 21 by' which it may be attached to anytube or conduit, through which hot air may be. admitted to the carbureter. rlhis extension of the carburetor is provided with a neck 22 having a female thread therein with which engaging` a neck 23, which extends down from and supports the mixing chamber .28 of the carbu'i'eter. This neck has preferably a funnel shaped portion 23 at the top thereof. at the to of which funnel shaped portion is a series of raised inclined surfaces 24 which furnish a rest for the gravity actuated battle 25.

` These raised surfaces 24 hold the baffle 25 up from the inclined surface of the :fim-u ange having a nel shaped portion, lea-ving a free space for the air to pass vtrom the inlet 20 under the baille through the recesses GS upthrough the large openings between the guides 70 into the upper part of the mixing chamber. The flange at the top' of the tunnel shaped portion provides an annular seat 26 on which rests the carbureter head 27, whichy head is hollow and forms thej upper part of the mixing chamber 28. Y

At the top ot this mixing chamber is placed. a throttle valve 29, mounted on the shaft 30 fastened thereto by the set screw 3l, the oscillation of which valve is limited by the damper screw 32, which is held in adjusted position by the set screw 33. At the top of the carbureter head is provided a suitable dange 34 by which it may be attachedto the intake manifold of the motor. A pin or screw 35 is provided which arrests the throttle valve in its opening movement and holds it when in position to give a. maximum opening in the passage.

Surrounding the annular seat- 26 and extending downward therefrom is the flange 3G 'which is suitably threaded on the outside with a male thread and which engages with a female thread formed in 'the shell 37 which surrounds it and forms the lower portion olf the mixing chamber. This shell has a circularopening 38 in the bottom thereof through which the bulk of the air can pass into the carbureter. T he air passes through the annular opening between the rim of the circular opening 38 in the shell 37 and neck 23, which extends theretlu'ough. No fuel other than air is admitted to or passes through the opening 38 controlled by the valve.39. Surrounding the neck and normally closing the opening 38 is an annular valve 39 which has its periphery beveled to engage with a corresponding beveled surface or valve seat 40 surrounding the opening 38. The valve I-lfl isfree to rise and fall around the sleeve 23 and make close contact with the valve seat Ii() at the bottom ol ,the shell 37.

This valve 39 is normally closed or is nearly closed when the motor is running at low speed and litkle or no air enters the carbureter through the opening controllcd thv-eby, but the air enters` through the air ini ke 20 instead. This is due. to the 'tact that' at low speed there is a very low vacuum in the upper part ot the mixing chamber lVhen the speed ot the motor increases, the vacuum in the chamber 28 increases and the pressure of the, outside air becomes more unbalanced so that it will litt the valve 39 'from its seat and enter the lower part of the mixing chamber through the opening 3S controlled by this valve 3i). rlhe ratio ot' the area and weight of the valve Bil and the area of the passages 68 in excess ot the effective area of the choke tube surround im: the spray nozzle must be such that the engine must pass a certain number of R. P. M. and make a correspondingly stronger vacuum in the mixing chamber, before the, valve 39 will lift, after which the valve will litt higher as the speed ot' theengine increases or as the vacuum in the mixing chamber increases. A shoulder ll surrounds the neck' 23 at the top and limits the upward movement of the val-ve 39.

jThe baille 25 carries a pin 42, which piu 75 has a taper 43 on the bottom thereof. 'l'he pin 42 extends up through the baille 25 and is surrounded at the top by a washerpr plate 44 which vrests on a flange L5 in the baille. This plate and the pin closes the top of the baille. A nut 46 is used for holding this plate in position. It will be seen that the baille 25 is hollow und exposes a. large area to the action of the inrushing air and its lveight or its resistance to the free flow of air is comparatively little.

The baille 25 will remain on its rests while the motor is running at low speed, there being suilicient room below the baille and in the recessesV 68 and the recesses between the guides 70 to permit the air that is drawn through the earbureter up to a certain number of R. P. M. ot' the engine to pass the baille without lifting it. lV hen the speed of the engine increases, the vacuum in the mix- 95 ing chamber also increases and the air rushes in larger volume through both the intake 2() and the intake controlled by the valve 3!) and lifts the baille 25.

The air that passes through the opening 38 passes-into the lower part ot' the mixing chamber thence through the openings (Si) and under the baille andthen up around the baille into the upper part ot' the mixin chamber.,

It will be understood that at all times during the :flow of air the pressure of air in the lower part of the mixing chamber under the baille will be higher than in the upper part ol' the chamber and when the diil'ereiue ip 110 pressure is suilieient, the baille will be liiled aud the volume ot' air that flows past it will correspondingly increase. The pressure is oi' course highest outside of the enrbureter, the pressure dropping as the air passes through 1'15 the intake 20 past the baille and into the upper part oi' the chamber or as it passes under the valve 39 through the openings 6) under and past thev baille 25 into the upper part of the. mixing chamber, the pressure drop- .12o ping rapidly in the narrow openings through which it passes and slowly in the wide openings', a low vacuuurin the upper part oi" the mixing chamber being sutliclent to draw the air through the. intake 2() and a higher vacu- 125 um being necessary to lift the vulve 39 and draw the air through the opening 2li and lift the baille aS well.

ln this manner the passing oF the air through the earbureter is regulated.

The apparatus that sprays the fuel in the carbureter and'regulates the flow of the fuel,

` will now be described.

Extending vertically through the necks and 23. is a tube 47 which tube has a tiange 48 on the outside thereof. This {iange rests on the bottom of the air intake opening 20 of the extension 19. The tube extends downwardly through the opening in the extension 18a and projects below the bottom thereof. At the top this tube is provided with the female thread 49. In line with the passage way 18 and below the flange 48, this tube is provided with an opening 50 through which gasolene or other liquid fuel may be admitted from the Hoat chamber to the interior of the tube.

This opening is placed. at or near the top of the passage way 18 so. as to prevent water or other heavy material that. would settle to the bottom of the passage way from getting through the opening 50 into the spraying nozzle. To increase this protection the passage way 18 is made large so that a considerable quantity of heavy liquid can accumulate therein 'before it will pass i through the opening 50 into the spraying nozzle, and this accumulation of water or other liquid can be drained ot'f through the drip cock 2. This prevents water from getting into the spray nozzle ot' the carburetor where in cold Weather it would freeze up and interfere with or prevent its operation.

At-the bottom of this tube 47 is the male thread 51 with which engages the gnut 52,

. the upper surface of which is ground. This nut engages with thev lower surface of a boss 53 constituting a part of the extension 18a. This nut is turned upwardly and draws the tube 47 down until the flange 48 rests against the bottom ofthe air intakeopening 20 and holds the tube rigidly in place and at the same time closes the vertical opening in the passage way 18, through which the tube 47 extends, against possible leakage of gasolene.

Inside of the outer tube 47 is a smaller inner tube 54'having a male thread 55 at the top thereof which engages with the female thread 49 of the tube 47 by which the two tubes are held in position with relation to each other. The tube 54 has areduced external diameter at 56 to provide an annular passage Way between it and the tube 47.V

Near the bottom 'of this annular passage Way, the tube 54 is provided with the openings 57 through which gasolene can Vflow from the tube 47 into the interior of the tube 54.

The inner tube '54 is provided near the bottom thereof with the lugs 58 by which it may be conveniently turned whenv it is moved into threaded engagement with the tube 47. The upper end of the inner tube 54 is open so that gasolene or other fuel may tlowout at that end along the tapered pin 43 and up into the mixing chamber ofthe rarbureter. 'lhis'opening and the tapered pin constitute the apra)v nozzle of my carburetor. rl`he initial opening of the spray nozzle is determined b v the vertical adjustment of the tube 54, partially closed b vthe tapered pin 43 and the subsequent opening is determined by the taper ot' the pin 48 which is lifted to enlarge the opening. Below these lugs is a male thread 5S) with which engages a stuffing boxtu. the tube 54 is provided with the female thread (i2A at the bottom thereof and at a suitable distance below the top thereof. is provided the shoulder (i3 above which the opening in the tube is ot' reduced diameter. Extending through the tube 54 is a needle valve (i4 having a handle (35; having a threaded portion G6 that engages with the female thread (i2 and having a tapered end G7 at the top thereof which isiadapted to engage with thel .shoulder (i3 for the purpose of limitingthe opening through the tube. 54 and controlling the supply oi gasolene that is fed theretln'ough.

t the bottom of the outer tube 47' is a stuiing box by which the joint between the inner and outer tubes is closed.

Between the battle rests 24 occur the recesses G8. The funnel shaped portion z2-l The interior of' is perforated with the openings of) which openingsr may be ot' any number, size and sha-pe, it being understood that their combined area shouldbe equal to or greater than the opening controlled by the valve 39, it being further understood that theI funnel shaped portion is a support for the carbu! i vided the guides 70, preferably -four in numi ber, each having the projections or stops 7l at the top thereof. The baille 25 is tree to rise and fall between thegnides 7() and is limited in its upward movement by the stops 71. It is limited in its downward movement 'by the rests 24.

The opening for the passagev of air that is uncovered by the valve39 is approximately equal to the clearance between the batiie 25 and the surrounding chamber and is also equal to the netopcning of the dis'- charge opening as uncovered by -the throttle valve 29.

' The operation of my carburetor .is as follows;

Gasolene is admitted through the elbow 13 and tiows into the tloat chamber. As the gasolene rises in this chamber, the float rises i and with it the needle valve 17", which closes the inflow of gasolene when the desired leve'l has been reached. The gasolene flows from the float chamb'er through the passage fway 18 into the tube 47 and thence into the tube 54.' y

Tof regulate the flow into the tube 54,

- the needle valve (il is adjusted to limit the flow of gasolene for high motor speed, which is the maximum amount that will be needed.

At low speed, there is suilieient vacuum to cause the gasolene to b e drawn u i through the clearance between the tapere needle valve 43 and the surrounding passage way so as to mix with the air that comes into the carbureter through the opening 20. As the speed of the motor increases, anda larger quantity of mixture is drawn into the motor the vacuum in the mixing chamber 28, increases or the unbalanced pressure of the outer atmosphere over the pressure within the mixing chamber increases. This unbalanced pressure causes the air to lift the valve 39 so that a quantity of air can pass between the valve and its valve seat, the lifting of the valve being governed by t-he weight and area ofthe valve.

After the air has passed the valve 39, itl

then passes through the openings (39 into the clear space between the baille :25 and its rest. 1f the recesses G8 which are cnt between the baille rests 2 4 cannot pass the air with suilicient volume to satisfy the vacuum in the mixing chamber above the bailie, the difference in pressure will cause the baille 25 to lift from itsrest and increase the arca available for the passage of air. `The lifting of th'e baille. :25 raises with it the needle valve 43 and increases the area through which gasolene is drawn and the jet;of fuel will ilow up through the opening regulated or governed by the valve. -ll irl correspondingly larger quantity, due not only to the larger area exposed thereby but 1to the increased unbalanced pressure oi the outer air which lifts` the valve 39 and acts on the fuel causing it. to ilow faster through the spray nozzle. The baille :25l can be lifted to the limit. of the projection or stop 71 when its upward movement will cease. These stops are provided more forl the purpose of holdingl the baille in place rather than regulating or limiting its upward movement. It will something happen, due to the sudden acceleration of the motor that. the baille will act violently which if continued, will cause the baille to close the opening at the top of the mixing chamber nml this is to be avoided.

When -the engine is running on low speed -and the throttle is then opened the vacuum in the mixing chamber will be increased and. the effect 'of this is to draw more air` through the intake 2O and around the spray nozzle and suck more gasolene through the spray nozzle and raise the valve 39.

. The vacuum in the mixing chamber below the baille causes a simultaneous inrusli of air throu h the opening Q0 and a rush of gasolene trough the spray nozzle. The air, be-

cause it is lighter, slightly precedes the flow of gasolene which follows immediately thereafter and both of these precede the fiow of air past the valve 39 and past the baffle 25 from the valve 39 due to the fact that the clearance between the baliie 25 and the passages (5S is smal. and the flow is correspondingly restricted, and the lifting of the valve 39 is delayed until a suilicient vacuum is developed below the baiiie.

Clearance in the passages 68 under the baille 25 is preferably small being only slightly greater than the clearance in the annular opening around the spray nozzle. Because of the simili passages (5S the vacuum below the mixing chamber is produced gradually and when it is sutliclently formed the outside air raises thevalve 39 and rushes in through the opening 3b and through the openings (39 in suilicient volume to raise the baille 25 and hold it up. lf the clearance in the passages (SS be increased by making the rests l higher the valve 39 will, lift and the air will passearlier and in larger quantity and make the mixture thinner and if the clearance of the passages (38 be decreased by making-thc rests 2l lower the valve 39 will lift later and will delay the inrush of the air and will pass it in smaller volume and will make the mixture richer. If the rests 2l are made lower and the valve 39 and baille 25 are made lighter the valve and baille will lift quicker and substantially the same quantity of air and fuel will pass as before, experiments showing that the valve and baille should be made no heavier than is necessary to make the vacuum needed to lift the i'uel in the spray nozzle.

'lhe height of the seats :2st or the clearance of' the. passages (it4 and their relation to the weight of the valve 39 constitute one 'of the important Ifeatures of my carbureter. lt is also desirable to have the baille '25 lighter thanthe valve 39. The valve 39 lis made only suilicently heavy so that the pressure which lifts it will also canse the gasolene to ilow in suilicient quantity from the spray nozzle and the current of air then passing the. nozzle will spread it on qthe under sur` will gradually increase between the time of lowest motor speed and the time that valve 39 is opened. When valve 2Q 4opens the air rushes into the lower part of the mixing chamber and when 1t has formed suthcient pressure therein, it lifts the baille' lifting of the taper pin 43 from the spray nozzle thus increasing the area of its open. ing.

The high speed needle valve 6l may be dispensed with provided thejproper taper is given to the pin -13 to 'feed the proper lamount of fuel for increased speeds but as this'taper if used alone, will vary for different motors, it is preferable to so taper the pin 43 that it will feed a too rich mixture and then thin out or correct this richness by theiadjustn'ient of the needle valve 64, which can he given a permanent setting according to motor that the carbureter is to be used with. Because of the arrangement of parts and the regulation of the vacuum secured thereby, a spray nozzle with a relatively large opening for the gasolene may be used without passing an excessive amount of gasolene therefrom which still gives a correct supply at all speeds.

As a vacuum is produced in the mixing chamber the pressure of the air in the float chamber forces the gasolene up through the spray nozzle into the mixing chamber and the higher the vacuum in the mixing chamber the greater will he the pressure behind the gasolene tending to force it past the. needle valve.

As the gasolene flows up it strikes the bottom of the baffle and spreads ont on it in an expanding lilm getting thinner as it gees. 1t is caught by the annular current of air that enters from the intake 20 and surrounds he spray nozzle and is carried up the batlle by this air current and is'also exposed to the air that enters from the valve 39 evaporating and mixing with it so that complete evaporation and thorough mixing ot' the Ygasolene and air is secured. rlhe higher the speed of the engine the higher will be the Vacuum and the greater will be the pressure forcing the'gasolene past the needle valve 63 from the float chamber. The valve il!) will lift and the air will come in rapidly through the opening 38.and the more will the baille 25 be lifted and the more will the end of the spray nozzle be opened,

As the'bafile raises the taper pin l-l also raises and enlarges the annular ,opening at the top of the spray nozzle and permits the gasolene to flow or spurt faster from the nozzle.

`In this way perfect regulation of the supply of air and gasolene at all speeds will loe secured. ='The' baflle 25 exposes a large surface to which the liquid gasolene can adhere it is carried up by the rush et air and at low speed the under surface of the baille is kept coated with gasolene which is not carried away from the baille as a liquid but only as a vapor and this coating of the gasolcne is Iin reserve ready to mix with the first rush of air through the intake 20 when the throttle opens so that at no time is the mixture starved of gasolene.

lt will be understood that the tapered needle may if desired be lifted by or with the valve 39 in which case it would lift slightly earlier than if it lifted with the baille and in Fig. 8 I have shown a construction by which such a result may be secured. It will also be understood that the opening Q0 may be dispensed with, and a series of small openings 100 through the valve 3f) may be used instead, or rests 101 may be, put in the seat for the valve 39 with openings between them giving a xed amount of initial clearance between the valve and its seat as is also shown in Fig. 8.

ln Figs. 3. el, and I have shown a link or links for moving the throttle valve, the links being adjustable longitudinally so as to hold theI valve in the correct. initial position. As shown in Fig. 3, the throttle is mounted on a shaft 30 on the end of which is a crank SO. ln Fig. 4, the end of the crank 8() is threaded to receive the stud 81 the vopen end ot which is spun to receive the hall F42 on the end of the shank 83 which shank is internally threaded to receive the screw 8l. The screw Si has a Hat head and surrounding the head is placed the flanged nut S5, which has the flange 86 on the one end thereof. This flange is perforated to receive the stein of the screw, the nut suri The nut is placed on the stem of the screw as shown in Fig. -land the screw is fastened in the shank S3. The nut S5 is internally threaded at its outer end to receive the threaded end of the stem 87 which engages therewith to form a link extending from the steering column to they crank of the Valve in the earbureter. The head of the screw is clamped between the flange of the nut and the end of the stem. By turning the screw 84 in or out from the shank S3 any desired :uljustment in the length of the link may be secured so that when the valve is brought against. the end of the screw 32 in any position in which it may be set the throttle lever. on the steering column of the antoniobile. connected to the link, will he in the correct position.

ln Fig. 6, the end of the shaft 30 of the valve is provided with a crank 8O having a flat end to which is pivotally connected the fork 90 on the end of a sleeve 91 having a. clamp 93 on the other end thereof. A stem 92 engages in the sleeveand is fastened therein hy the clamp. This sleeve and stem constitute a link that connects the crank of the throttle to the-throttle lever on the steeragainst the end of the screw 32 in any posi-A tion in which it may be set the throttle lever, on the steering column of the automobile, connected to the link, will be in the correct position.

I claim :l

l. A cai-bureter comprising a mixing chamber having a spray nozzle therein, a movable baille plate placed in said chamber on a fixed rest intermediate the ends thereof, said, baille plate being moved toward one end of said chamber by a heavy rush of air through said chamber and being undisturbed by a moderate flow of air, a small clearance 'being provided at the rest around said baille, a larger clearance being provided around saidbaille above said rests.

2. In a carbureter 'the combination of a mixing chamber having an air inlet and outlet, a movable baille mounted in said chamber,l a mutilated seat for said baille on which said baille normally rests, the mutilations in said baille seat permitting a moderate quantity of air to pass without moving the baille, said ba-ille being moved from its seat by the rush of a large quantity of air, stops for limiting the' upward movement of said baille and guides for controlling the movement of the baille between its seat and 'aid stops, said guides being located on the casing outside of the circumference of the baille, said stops being located at the end of saidl guides.

In a carburetor the combination of a mixing chamber having an air inlet and an outlet therefor and a plurality of air sections therein of a movable member therein, atmospherically controlled and adapted to partially separate the sections both when normally at rest and after being moved and adapted when moved to adjust its position to the partial vacuum of. different degrees that exist in each of the sections with a higher degree of vacuum in the section nearest the discharge orifice and a lower degree of vacuum in the section nearest the inlet orificerests for said member forming a mutilated seat therefor, a spray nozzle concentric with said movable, member and a sccond movablemember atmospherically oper'- ated located in and capable of controlling the main air inlet governing the degree of vacuums and the rapidity with which one can be formed with relation to the other, and means for mechanically varying vthe supply of fuel furnished by the spray nozzle in proportion to the flow of air, said means 'being operated by the air currents.

4. `In a carbureber, a spraying nozzle, lhaving an outer tube' and an inner tube having a threaded engagement therewith 4and longitudinally adjustable therein, a chamber inelosed between said' tubes and an` opening lnznofiee through said tubes communicating with said inclosed chamber, a valve seat above the opening in the inner ltube and opening downwardly, a needle valve coperating with said seat to limit the iiow of gasolene therethrough, the stem of said needle having a threaded engagement with the inner tube and extending outside of said tube to permit adjustment thereof.

ln a carbureter, a spraying nozzle having an outer tube and van inner tube having a threaded engagement therewith and longitudinally adjustable therein, a chamber inclosed between said tubes and anopening through said tubes communicating with said inclosed chamber, a valve seat above the opening in the inner tube and opening downwardly, a needle valve cooperating with said seat to limit the flow of gasolene therethrough, the stem of said needle having a threaded Vengagement with the inner tube and extending outside of said tube to pgrmit adjustment thereof, a tapered pin "cooperating with the upper end of said 1nner tube to limit the flow of fuel therethrough, said inner tube with its needle valve beingv adjustable toward and away from said tapered pin to lix the' minimum How of fuel therethrough.

6.111 a carbureter, a spraying nozzle ha` ing an outer tube and an inner tube having a threaded engagement therewith and longitudinally adjustable therein, a chamber inclosed between said tubes and an opening through said tubes communicating with said inclosed chamber, a valve seat above the opening in the inner tube and opening downwardly, aneedle valve coperating with said seat to limit the flow of gasolene therethrough, the stem of said needle having a threaded engagement with the inner tube and extending outside of said tube to permit adjustment thereof, a tapered pin cooperating with the upper end of said inner. tube to limit the flow of fuel therethrough, said inner'tube with its needle valve being adjustable toward and away from said tapered pin to fix the minimum flow of fuel therethrough, said tapered pin being raised and lowered by the air current to varyv the flow of fuel above the minimum.

7. ln la carbureter, the combination of a mixing chamber variably divided by a movable member within the chamber, an inlet orifice, a member normally closing said orifice, said member being exposed to the atmospheric pressure, a series of fuel controls, consisting of a movable tapered pin, carriedv on said first named member, said first named member being moved by the inrushing air currents to vary the air and liquid fuel openings, a seat adjustable to said' pin to vary the normal opening that is enlarged by the movement'of the pin.

8. In a carburetor, vthe combination et an hir chamber, an air valve atl/one end of said chamber, a movable baffle lin said chamber above and separate from said air valve, the air passage being disposed so as to pass a small current of air Without moving either the valve or the balile, said valve and said baille being both lifted by a heavy rush of air, a gasolene jet in said carbureter, means for en arging the area of said jet upon the lifting of said valve and baffle.

9. In a carbureter, the combination of an air chamber, an air valve at one end of said chamber, a movable baflie in said chamber above and separate from said air valve, the air passage being disposed so as to pass only a small current of air without moving either the valve or the baiie, said valve and said baile being both lifted by a heavy rush of air, a gasolene jet in said carbureter, means for enlarging the area of said jet upon the lifting of said valve and baffle, said valve and said baffle regulating the flow of air through said carbureter.

. 10'. In a earbureter the combination of a mixing chamber having inlet and discharge openings and a spray nozzle, a baffle therefor, said baliie comprising a hollow conical shell having a sloping top draining toward the periphery, 'the cone shaped side being substantially as .long as the radius of the top f of the cone.

11. In a carbnreter the combination of a easing having a small air inlet constantly open and a fuel inlet constantly open and a suction operated member controlling a large air inlet, a second suction operated member automatically controlli-ng the flow of air through an air chamber formed in the casing whereby on high speed a. dierent vacuum is created above the second suction operated element from that below said element, said second suction operated element having means for increasing the flow of fuel. K ln testimony whereof l aix my signature in presence of two Witnesses;

CHARLES J. PEMBROKE. Witnesses:A

Amon M. JOHANNS, EDNA K. BOOTH.