US1032547A

US1032547A - Carbureter.

Info

Publication number: US1032547A
Application number: US50938009A
Authority: US
Inventors: Albert Howarth
Original assignee: STAR CARBURETOR AND SUPPLY Co
Current assignee: STAR CARBURETOR AND SUPPLY Co
Priority date: 1909-07-24
Filing date: 1909-07-24
Publication date: 1912-07-16
Anticipated expiration: 1929-07-16

Description

A. HOWARTH.

GARBURETER.

APPLICATION FILED JULY 24, 1909.

1,03,547; I Patented July 16, 1912.

2 sums-sum 1.

(OWNECTEO WITH AN OPERATING A. HOWARTH.

OARBURETER. APPLICATION FILED JULY 24, 1909.

Patented July 16, 1912;

Lemmy? 2 SHEETSSHEET Z.

fear a ALBERT HOWARTH, F PROVIDENCE, RHODE ISLAND, ASSIGNOR, BY MESNIE ASSIGN- MENTS, TQSTAR. CARBURETOR AND SUPPLY COMPANY, OF PRQVIDENCE. RHODE ISLAND, A CORPORATION OF RHODE ISLAND.

GARBURETER.

Specification of Letters Patent.

Patented July 16, 1912i Application filed. July 24, 1909. Serial No. 509,380.

- accompanying drawings.

' g'asolcne-feed needle mounted therein.

Like reference characters represent like parts.

Figure 1 1s a front ele "HUGH of my lin proved carbureter. Fig. is a side elevation of the same, the throttle valve and air valve being partially open. Fig. 3 is a bottom plan, view as seen on line a a of Fig. 1. Fig. "l: is a cross sectional view 'as seen on line 0 c of Fig. 5. Fig. 5 is a central vertical section as seen on line Z) Z) ofFig. 1. Fig. 6 is a view partly in elevation and partly in section as seen on line 0 c of Fig. 1. Fig. 7 is a view partly in plan and partly in section as seen on line (Z d of Fig. 5. Fig. 8 is an'isometric View of the combined throttle valve and air -valve, together with the Fig. 9 is a cross sectional view of the gasolenefeed needle (on an enlarged scale) as seen on line'f f of Fig. 8. Fig. 1-0 is a view of the mixing chamber and. the bottom thereof, as seen in section on line 5], g, of Fig. 8, and includes a sectional view (on said line) of the conical nozzle and of its tube.

My invention relates to the class of carburetors for gas explosive engines adapted to use for propelling automobile vehicles and for other work; and it consists of the novel construction and combination of the several parts and elements hereinafter described as set forth in the claims.

in the drawings, the reference numeral 1 indicates the mixing chamber of the C2t1l)1l havingat i upper end an annular ictioi or 1-. 2, and an axially directed, conccn. c, tubular extension 3, whose inner surface is tireaded, as seen in Fig. 'i'houter peripheral surface of the tubular. citrus-hm has the heXagonally-ar-- ranged wrench-faces t, illustrated in Figs. 1 and An outlet pipe his in threaded con" ,nccticn with the tnbular'extension 3 and serves to. cen uct to the engine (not shown-y the carhnreted air produced by the carbir rotor. The mixing chamber 1 also has at its bottom the tubular extension 6, which has the interior screw thread, shown in Fig.5. It also is provided with the two ear-

pieces

7, 8, through which a binding screw 9 passes, as seen in Figs. 1, 2 and 5.

The mixing chamber 1, has on one side a tubular extension 10 to contain a relief air valve as hereinafter. described. A shaft 1]. passes through apertures made therefor in themixing chamber 1 and also through the

bosses

12, 13, integral with said mixing chamber and forming therewith the bearings, in which the shaft 11 is so mounted as to be capable of an oscillatory movement therein. The shaft 11 is oscillated by power, applied by the operator to a lever (not shown), whose end is connected by a link or red 14 to the end of a crank or arm 15 by means of a pivotal screw as illustrated at- 16. This crank or arm 15 is mountedupon one end of the shaft 11, as bestseen in Fig. 2, and fastened thereto by a key or spline 17. Forthis purpose the crank arm 15 is made with a. tubular hub or head 18. A sectorshaped piece 19, integral with the crank arm 15 (at the end which is adjacent toth e tubular hub or head 18) has the two flanges or bosses 29 and 21f A regulating or adjusting screw 22 'is mounted in and through the boss or flange 20, as shown in Fig. 2, and is held in its adjusted position by a check nut 23. The crank arm 15 carries a valve 24, preferably integral therewith and of the substantially hook-shape illustrated in Fig. 2. I

From one side of the mixing chamber 1, a stop pin 25 projects, with which the boss or flange 21, of the scctor-piece 19 of the crank arm 15 and also the inner end of the adjusting screw arealternately brought in con tact, thus limiting the extent of the oscillation of the crank arm 15 and the shaft 11, on which the crank arm is fastened. The shaft 11 carries the curved arm or cam 26, which has the curved cam edge 27 and which is mounted on the shaft by its tubular head 28, and fastened thereon by themin 29.

Themixing chamber 1. has a sectorshaped aperture 30, shown by dotted lines in Fig.5 and partially by full lines in Fig. 6. The mixing chamber 1 is made with an exterior flat bottomed recess, represented in Fig; 6, around which is an arc-shaped rim 31, with a flat face. A sectonshaped, liaryvalvc- I stop 32 is secured by a screw 33 to the mixing chamber 1 in the bottom of the recess.

- An auxiliary air-valve 34 has an arc-shaped periphery, about 234 in extent, andis movable in said recess in sliding contact with the bottom thereof, being concentric w1th said recess. The outer plane surface of the air 'valve 34 is flush with the adjacent plane surface of the carbureter body 1, as seen in Figs. 4 and 6. A portion of its periphery is toothed or serrated, as illustrated in Fig. 6 at 35. A handle 36 preferably integral with the valve 34 extends radially therefrom. The acute-angled point of the valve stop 32 furnishes abearin against and upon whichthe obtuse-angle portion of the radial surfaces of the air valve 34 is in contact, and so allows said .valve to oscillate concentrically in said recess to cover or uncover, at the will of the operator, the aperture of the mixing chamber 1; The air valve 34 is supported in position by the in: ner plane face of the hook-shaped valve 24,

which is slidable on the flat face of the rim 31 and on the exposed plane surface of said air valve 34, and it is also supported by the inner plane surface of the flange 20 of the crank arm 15, which flange isslidable on the outer plane surface of the air valve 34,'a s "represented in Fig. 1, but most clearly 1n cent squared end of said plug. An adjustposition.

Y 44 has an outer head 45, whic contact with the central boss of; thedisk 43,

ing screw 40 is in threaded engagement with said bore and furnishes a bearing for the outer end of the spring 38, and thus.- regulates the tension of said spring. The protruding sharpened end of the plug- 39 is conical and engageable'with the teeth or serrations 35 of the auxiliary air valve 34, thus securing the said valve in its adjusted The contact of the valve handle 36 with the tube 37 limits the movement of the valve 34 in one direction and the contact of said valve handle with the end 41 of the rim 31 of said recesslimits the movement of the valve 34 in the opposite direction.

A diametrical piece or web 41 extends across the tubular extension 10 and is provided with a central bearing 42. A disk 43 constitutes a relief valve and has a central threaded aperture. The relief valve stem is in snug as seen in Figs. 4 and 5, being engaged with said disk by screw-threads, as lshow The cylindrical portion of i the. valve s m 44 slides loosely in the bearing in the web 41. The valve stem has a head-*46 at its inner stem 44 and has its hearing at one end against the head 46, and also has its oppositebearing against therear surface of the bearing 42. By force of this spring the disk 43 is normally held in close contact here spreads conically. Awater jacket 50 surrounds the chamber 48, as represented in Fig. 5. The water jacket 50 is tapped in two places, diametrically opposite each other, for the reception of two

pipes

51 and 52, to supplywater thereto. Two air-

valve apertures

53, 54, open through the chamber 48, being diametrically opposite to each other as shown in Figs. land 2 in solid lines, and one of them is shown in Fig. 5

in dotted lines. The sides and bottom of each air'inlet or aperture 53 are tapered, as

shown in solid lines in Figs. 2, 7 and 10 and in dotted lines in Fig. 5.

The chamber 48 has a bottom 55, shown in Figs. 3 and 10,'and is provided with an annular flange 56, a portion of which is toothed or serrated, as illustrated in said Fig. 3 and in Figs. 1, 2 and 5 at 57-. Through the bottom 55 of the chamber are the two diametrically opposite air inlet holes 58, 59, for the entrance of primary air.

The water jacket 50 is provided with a plug 60, by the removal of which the contents of the water jacket may be drained. A nozzle or cone 61 for supplying gasolene to the chamber 48 has a tubular stem 62, the upper end of Whosebore is threaded as shown at 63, and is also provided with a concentric enlargement, as seen at 64. The lower part of the stem 62 has the'external thread 65 and just below the conical head 61 is threadend. A spiral spring 47 surrounds the valve ed externally, as seen at 66. The diameter of the threaded tube 62 at 65 is somewhat less than the .diameter of said threaded tube at 66.

The primary air valve is designated as 67.

It has a centralenlargement 68, provided with a circular aperture, by means of which 1t 1s loosely mounted on 'the tube 62, as best illustrated in Fig. 5, in contac'twith. the lower annularedge of the cone head 61.

Thevalve 67 has a handle 69, extending therefrom with a bend 70. The valve 67 has a projection 71 formed therein,,which en- 5. The hole in the nut 72 is large enough to allow said nut to slip loosely over the screw threads in moving up along the lower end of the tube 62 to its engaging position illustrated in Fig. 10. Tl'ie'primary air valve 67 has a limited rotation on the tube 62, so as to cover or uncover the air inlet holes .58, 59, as the operator desires. This action of the primary air valve is best illustrated in Fig. 8.

a 'ulator 73 has a plurality of .i cted holes, one of which sho n at 74. From the inner ends of these holes on axially-directed passage extends upwardly, as represented in dottedlines in Fig. 5. The holes'id open into the chamher or enlargement 64 of the tube 62. The tubetSEZ has the pipe 75, whose inner end opens into the chamber or' enlargement- .64 of the tube 02. A. gasolene supply pipe '76 is in threaded connection with the outer end of the pipe 75 and conducts gasolene em a tank or other source (not shown).

e gasolenofeed regulator has at its upper end 'a screw-threaded connection. with the threaded portion 03 of the bore of the cone head or nozzle 01. A handle 78, passin through the lower portion of the gasouse regulator, enables the latter to turn upon the screw-threads 03. A Washer 1 9 lies inst beneath the concaved annular ed n 77 oi the tube 02 and is held in p0si- 3, 5 th ot H0, which "engages the screw- 65, us i resented. in Fig. 5.

'5". the bore of the conical head or noz;..e 01, as seen in Fig. 5, and has an axial longitudinal passage through it. The gasolene needle valve comprises, three parts,a head 82, which has a roundedbottom and conieally tapering sides and fits the concavity of the valve seat 81, as shown in .l' ig. 5; a cylindrical. stem 83, extending up axially from the upper larger end of the valve head S53; and a long needle 84, which extends axially downward from the smaller end of the valve head 82. The needle 84 extends loosely in the longitudinal, axial bore of the gaso'lene feed device shown inFig. 5.

The valve stem 83 is provided with a transverse hole, in which is inserted a cross pin. The needle S41 is shown in cross section on an enlarged scale, the straightsurface indicated by 86 in .l i extends diagonally with respect to t .zial line of said needle, as represented in Fig. 8, so that the needle tapers on said surface, andthe needle is larger at the top of said taper than at the end of the taper. The needle S li.uay, how-' ever, be simply tapered concentrically to form a long cone, if preferred.

A piston valve 87 fits in the bore of the chamber 14-8 and is slidable therein. It is a combined throttle valve and air valve. It has near its upper end the outlet openings dlevalve seat ill fits in the 88 for the discharge ofcarbureted air, which openings extend between the posts 89. There is a diametrically extending web piece 90, in which is a tubular bearing 91. The stem 83 of the gasolene. needle valve is loosely mounted in the bearing 91.. The cylindrical portion 92 of the piston, when the parts are in the position represented in Fim 5, shuts. down over and closes the

apertures

53 and 54, as seen in Fig. 5. The piston valve has a solid top 93, which is integral with the tubular portion of the piston. When the piston is in the position shown in Fig. 5, the top 93 is almost flush with the top edge of the tubular extension 6 of the chamber 48, but it is a, very little above said edge. ,When the parts are in the position shown in Fig. 5, the air outlet openings 88 are closed by the inner surface of the tubular extension 0, and the air inlet openings 53 are closed by the cylindrical sides of the piston valve. By means of the cross pin 85, the valve stem 83 of the gasolene needle valve is supported loosely within the piston valve, as shown in Fig. 5.

A priming stud 94 has a threaded stem 95 (shown in dotted lines in Fig. 5), which extends through and is fastened in the bottom 55 of the chamber 48, and is provided with 'hexagonally-disposed faces and also with a downward cylil'ldrical extension 96. A priming swivel 97' has at one end an aperture to receive loosely the end of said extension, which, when the parts are assembled, is headed over to sustain said swivel in position. The outer portion of the swivel 97 is bifurcated and is bent at a right angleto extend vertically downward. A priming lever 98 is mounted between the bifurcated ends of the swivel and is pivoted thereto'at 99. An operating wire 100 is secured to an eye in the upper end of the lever 98, as seen at 101.. The priming stud 94- and its extensions are tubular, and a priming pin 102 is mounted slidably in the tube. The priming pin 102 has a head 103, and a spiral spring 104: surrounding said pin has its upper .end bearing against the headed-over end of the extension of the stud 91 and its lower end bearing against the head 103, of the pin 10 2. The lower, bent, free end of the priming lever 98 extends beneath the head 103 of the; pin 102 in contact therewith and supports said pin in position. The upper end of the priming pin 1.02 is in contact with the lower edge of the piston valve at one point thereof, as illustrated in. Fig. 5..

As shown in Fjig. 5, the operative end of the curved arm or cam 26 is in contact with the top 93" of the piston valve, when The parts are in the position there illustrated. The

piston

87, 92, is a free piston, that is, it is not operated by a piston rod. but is movable in one direction'by the sucl io r of the engine, and in the opposite direction by gravity or the "back pressure of the explosion.

- Having thus of my improved carbureter, I will nowexthrottle valve is opened entirely (or prin-' citpally) by the suction of the engine, instead 0 by the use of mechanically movable devices. Suppose that the carbureter is 'in its non-operative position and at rest, as 'shown .in Fig. 5[ At this time the curved arm or cam26,- fastened on the shaft. 11, is directed downwardly and presses down the top 93 of the piston valve, so that said top is flush (or approximately flush) with the upper .annular edge of the tubular top or extension 6 of the chamber 48. The aux iliary air valve 24 partiallycloses the .air inlet30, asshown in Fig. 2. Theprimary "air valve 67 partially closes the air-inlet;

openings

58, 59, as illustrated in Fig. 3.

The air-outlets 88 88, of the piston valve.

30 are closed by the tubular extension 6 of the chamber 48, as shown in Fig. 5. The air inlet openin s 53 and 5 1 are closed by the cylindrical side of the iston valve, as seen in Fig. 5. The flow ot gasolene is stopped by the seating of the cone head 82 in the valve seat 81, and by the seating of the needle 84- in the passage of the gasolenefeed regulator, as shown in Fig. 5.

The carburetor is set in operation as follows. The chauffeur draws the link'bar 14 in the direction indicated by the arrow 105 in Fig. 5, thereby rockingthe shaft- 11, which lifts the end of the curved arm or cam 26 from its forcible contact with the't'op 93' of the piston valve, sobthat the.piston valve is thereafter ready torise whenever motive power is applied for that purpose. The rise of the piston valve islimited by the cam 26,

when said cam. has been elevated by th' oscillation of the shaftll. The chauffeur then cranks the engine as usual, and gives th'e initial charge of gasolene to the carbur'eter by drawing the wire 100 in the direction indicated by. the arrow 106, thereby raising the free, lower end of the priming lever 98. This movement of the lever 98 lifts the priming pin 102-, and compresses the spring 104 (which spring, when released by the cessation of the power drawing the wire, returns said parts to their former, normal position). The rise of-the priming pinlOQ lifts the piston valve. \Vhen the piston valve so rises, three results are accomplished Qthe gasolene needle valve is slightly raised the air inlets and 54 are slightly described the several parts plain the mode of itsoperation. This car bureter belongs to the class of suction-oper--- uncovered, and the air outletopenings are also slightly uncovered, as they come up above the top annular edge of the tubulair extension-6' f the chamber 4.8. As the level of the asolene in the supply tank (not shown) is above the level: of the valve seat 81,the gasoleneis discharged from the valve seat 81 by gravity, and is mingled with tge air, which comes through the air .

inlets

3 and 54; and the explosive mixture, is) formed, passes out through theapertures $8 of the piston valve and passes throu h mixing chamber land the pipe 5 to t e engine,-and is ignited or exploded in'the' usual manner. The operation-of the carburet'pr, 80, having been thus establislied; continues aut'o matically until the chaufi'eur reverses the ,movement of the link 14,-thus rocking the shaft 11 reversely, and so causes the curved arm or cam 26 to press down to former position thepiston valve. Consequently the air openings of said valve'and of the chamber are closed again and the-flow of gasolene is stopped.

The gasolene is supplied to the carbureter through the pipe 76 from a tank or other source, (not shown). It flows by gravity from thepipefi 6, through the pipe 75, into the annularv chamberbr enlarged space 64 within the tube 62.' Thence it flows through the inlet holes 74 and up through the verti-r eal-passage shownin dotted lines in Fig. 5 and as t e needle valve 8-1, is lifted, the gasolene .is discharged into the chamber 48 in the open bottom of the piston valve, as already explained. The amount of gase lene so discharged depends on the amount of clearance of the tapered surface 86 of the needle 8 1 within the bore or passage of the gasolene-feed regulator. The degree of such clearance is determined by means of the handle 78, by which said regulator is turned upon the screw threads 63 'of the cone head or nozzle 61. The more the regulator is tom of the mixing chamber, and the horiward through the air inlets 53. These ver-. tica-l air currents and horizontal air currents strike one upon another adjacent to the valve seat 81 and valve head 82, and so thus mixing thoroughly the gasolene vapor and air to produce the carbureted air. The washer 7 9, and packing nut 80, constitute a stutling box to prevent the leakage of gasolene.

screwed up, the less the amount of the clear and vapor by the impinging of two zontal air currents which pass radially indissipatethe jet of gasolene there delivered, M

In order to diminish the richness of the mingled gasolene vapor and air, mixed within the piston valve and discharged therefrom into the mixing chamber 1, I use the auxiliary air valve. By the oscillation of the crank 15, as the link 14 is drawn in the direction indicated by the arrow 105 (Fig. 5), the

aperture 30 in the body 1 of the carbureter is uncovered to some extent, by the sliding of the valve 24 across it, as best illustrated in Fig. 2, whereupon the atmospheric air rushes in through the "aperture 30 and reduces the richness of the mixtureby adding thereto more air. The amount of. such auxiliary air supply through the aperture 30 is regulated by adjusting the position of the auxiliary air valve 34;. By moving the handle 36, as much of the opening 30 can be uncovered as desired, and the valve 34 is held in its adjusted position by the engagement of the plug 89 with that tooth 35 of the series of serrations, which then receives the pointed end of the plug, the spring 3tiserving to maintain such engagemeiit. It is observed that this valve 34 has no central pivot, on which to oscillate, but its areshaped edge in sliding contact with the areshaped rim 31 of the recess, wherein said valve is mounted, cooperating; with the acute-angled point of the piece 30 and the vobtuse-angled edge of the valve, constitute a substitute for a pivot and give the requisite fulcrum action. Thus the valve 34 may wholly close the opening 30, or maytully uncover said opening, or may partially close or open it to any intermediate degree. The clan'iping action of the binding screw 9 draws the

ear pieces

7 and 8 together and firmly secures the mixing chamber 1, of the carbureter to the tubular top 6 of the chamber 48, as illustrated in Fig, 5. In case of any extreme gas pressure within the car- -buret-er mixing chamber 1, the relief valve,

shown in Figs. 4-, and 6 acts automatically. The spring 47 is otany desired tension and normally closes the disk or valve 43 into forcibleclosing contact with the outer annular edge of the tubularextension 10, as shown in Figs. 4 and pressure within the mixing chamber exceeds the pressure of thespring 47, the disk or valve 43 is pressed outwardly, as represeated in 6', whereupon the excess of gas pressure 'is relieved by the access of atinospheric air. The spring 47 then being tree to act, automatically closes the relief valve to the normal position shown in Figs. .1. and 5.

In the regular, usual operation of the carbureter, the upward movement of the piston valve is caused by the suction of the engine. The downward movement of the piston valve is caused by the action of gravity, or by back pressure. .When, however: it is desired; to stop the engine, the 'link la is re But if the gas versed, thus rocking the shaft 11 reversely, and this oscillation of the shaft 11 brings down the curved arm or lever 26 forcibly,

ble of a rising movement by operating the wire 101 and the lever 98, as has been de-' scribed. The closure of the piston valve automatically by gravity is a more reliable and quicker action than a closure of it by mechanically operated means. When the piston valve descends to the position represented in Fig. 5, the valve head 82 instantly shuts into its-seat 81 and stops the gasoleue flow to the mixing chamber 48; l

- Acll' dni'iger ol baclt-fir-ing is prevented by the construction of my carbureter as described. The gases produced by the back fire, being in the mixing chamber 1 and necessarily above the piston valve, exert their full pressure upon the top 93 ot' the piston valve, cotiperating'with the action of gravity to close said valve instantaneously. As there is no drip of gasolene possible, no ex plosion or firing can take place in the carbureter or beneath" it. My improved carbureter has several adjustable parts and therefore can be easily adapted to various conditions of the Work required.

The quantity of primaryair passing into the carburetor through the

air inlets

58 and 59 in the bottom of the chamber 48 is controlled and regulated by the valve 67, which is set by hand to open or close the said air inlets wholly or partially to any extent desired, and when it is so set, it is held iii-its" adjusted position by the engagement of the projection 71 withsom'e one of the teeth 57' on the annular rim of the chamber 48. The ouantit-y of air passing into the mixing chamber 1 through the auxiliary air inlet 30 I is controlled and regulated by the auxiliary air valve 34, which opens or closes the aperture 30 to any desired extent, and is held in its adjusted position by means of the spring-pressed plug 39 in engagement with some tooth of the notched valve rim 35. The quantity of gasolene admitted to the chamber 48 is controlled and determined by means of the gasolene-tced regulator 73. The farther up the regulator .73 is screwed, the smaller is the discharge of the gasolene from the valve seat 81 when the needle valve is'raised by the piston valve.

As in my said Letters Patent No. 958,128, the piston valve, represented separatelyin Fig. 8, is both a throttle valve and an air valve.

When the piston manna the posi- 18av a 4 v i tion illustrated in Fig. 5, the top 93 thereofand the upper cylindrical portion adjacent thereto completely throttle the dischargeof the carbureted air from the mixing cham-- ber 48; but when, under the suction-power I claim as a novel and useful invention and'desire.to secure by Letters Patent:

1. In a carbureter, the combination of a tubular mixing chamber having side air-inlets; a discharge pipe from the mixing "chamber to an engine; a tube mounted in the mixing chamber; an open-bottomed piston valve slidably mounted in said tube and movable thereinvby the suction of the engine, and having a circular top and a tubular body adapted to' contact with said tube, and provided with mixture outlets through its sides adjacent to its top, said mixure outlets of the piston valve being closed by the outlet pipe of the mixing chamber when 'the piston valve is fully seated therein and said side air-inlets of the mixing chamber being closed by the tubular body of the piston Valve when the piston valve is fully seated as aforesaid, but both said mixture outlets and air-inlets being open when the piston valve is partially raised in the tube of the mixing chamber; and a valve and valvev aperture in the bottom of the mixing chamber for admitting primary air thereto. I

2. In a carbureter, the combinationof a tubular mixing chamber; a throttle valve slidably mounted in the chamber in contact therewith and having a tubular body; a

downwardly extending, axially-directed valve stem carried by the throttle valve and having a valve head atits lower end with conically tapering sides; a nozzle'having a bore; a detachable valve seat mounted in said bore at the upper -endof the nozzle and provided with an upper central concavity into. which said valve head is movable and also with a central longitudinal bore; a needle extending downward from said valve -end, passing slidably through thebore. of the valve seat and into the nozzle bore;

means for supplying gasolene to the nozzle; and means for supplying atmospheric air to the mixing chamber.

3. In a carburetor, the combination of a tubular mixing chamber; a throttle valve slidably mounted in'the chamber in contact therewith and having a tubular body; a needle valve carried by the-throttle valve and provided with a head; a nozzle having a bore; a detachable valve seat mounted in said bore at the upper end of the nozzle and provided with an upper central concavity into which the head of the needle valve is movable and also with a central longitudinal', tubular bore; a needle extendingdown- I ward from said needle valve head,

slidably through the bore of the valve seat into the nozzle bore, which needle is formed having a tubular body and slidably mounted in said chamber in contact therewith; a

nozzle extending up through the bottom of the mixing chamber and provided at its upper end with alva'lv'e seatwhich has a central longitudinal bore; an air valve having an aperture by which it is rotatably mounted on the nozzle beneath the bottom of the mixing chamber and adapted to cover or uncover said air -inlets; a needle valve carried by the throttle valve and having a head adapted to fit in said valve seat; a needle extending from said valve head through the valveseat and the bore thereof into the nozzle bore; a nut engageable' with the nozzle to support said air Valve in position; and means for supplying gasolene to the nozzle.

5. In a carbureter,-the combination of a mixing chamber, a throttle valve slidably mounted in the mixing chamber, a needle valve carried by the throttle valve and having a head, a nozzle having alongitudinal bore which is enlarged midway :to form a gasolene chamber, a valve seat having a longitudinal bore and mounted detachably in 'vided with air inlets, an oscillatory air valve adapted to cover and uncover said air inlets, and a nut supporting said air valve and adj ust'ably mounted on the nozzle.

6. In a carbureter, the combination of a mixing chamber having an opening through one side for the admission of auxiliary air;

means for supplying primary air to the mixing chamber; means for supplying gasolene to the mixing chamber; a valve rotatably mounted on the mixing chamber and adapted to cover or uncover said opening at will, which valve has an arc-shaped edge provided with notches; and a plug adapted to hold said valve in position by engaging any one of said notches'at will.

7. In a carbureter for operating an oil-- supplied to the mixing chamber while the engine is in operation; a needle valve stem mounted on the throttle valve and movable therewith; a gasolene-feed regulator 1031-,

provided with-a longitudinal passage; a

tapering needle valve carried by the needle 'alve stem and movable in said passage to control the discharge of gasolene therethrough; and means for supplying gas'olene to said feed regulator in said passage thereof. Y

8. In a carbureter for operating an engine, the combination of a mixing chamber; a throttle valve normally seated in the mixing chamber; which throttle is movable upwardly by the suction of the engine and downwardly by gravity; anozzle havingv a tubular bore and adapted to discharge gasolene beneath the throttle valve; means tor supplying atmospheric air to the mixing chamber; means movable at will to vary the quantity of gasolene supplied to the nozzle and the quantity of atmospheric air supplied to the mixing chamber while the engine isin operation; a needle valve stem mounted on the throttle valve and movable therewith; avgasolene-feed regulator 1ongitudinally movable in the nozzle bore and provided with a longitudinal passage; a tapering needle valve carried by the needle valve stem and movable in said passage to control the discharges of gasolene there through; and means for supplying gasolene to the feed regulator in saidpassage thereot. I

9. In a carburetor, the combination of a mixing chamber; a piston valve slidablymounted in the mixing chamber; a shaft mounted in the mixing chamber and capable of an oscillatory movement therein; means for imparting oscillatory movement to said shaft; a cam on said shaft adapted to contact with-the upper end of the piston valve to impart to the piston valve a downward movement when the shaft is oscillated in one direction and to limit the upward movement of the' piston valve when the shaft is oscillated in the opposite direction; a fixed nozzle havinga bore and extending .into the mixing chamber; a needle valve having a tapering needle and mounted on and movable with the piston valve; a gasobore, and means lene-feed regulator movable in the nozzle bore and having a longitudinal passage, which regulator is movable along said needlc; means for. supplying gasolene to the feed regulator through said passage thereof; and means for supplying atmosphericair to the mixing chamber. I

10. In a carbureter, the combination of a mixing chamber, a combined throttle valve and air valve slidably mounted in the mixing chamber and having air inlets and mixture outlets, which inlets and outlets are open when said combined throttle valve and air valve rises by engine suction, but are closed when saiilcombined throttle valve and-air valve is fully seated, a needle valve stem loosely mounted in said combined throttle valve and air valve and provided with a conical head, a tapering needle valve extending from said head, a fixed nozzle having a longitudinal bore and also a valve seat at the upper end of-said bore thereof adapted to receive the head of said needle valve stem, said needle valveextending slidably in a bore of the valve seat, and means for supplying gasolene'to said nozzle bore.

11. in carburetor for an engine, the combination of a mixing chamber, having air inlets through its bottom and other air inlets through its sides, a throttle mounted in the mixing chamber and able upwardly therein by the suction o. the engine and downwardly there-in by gravi which valve has-a closed top and side mixture outlets near its top, said mixture outlets of the valve and said sideair inlets of the mixing' chamber. are open when said valve.

is raised by said suction. a nozzle in the mixing chamber whose discharging end. is located opposite the lower edge of said side air inlets, a needle valve on the throttle valveadapted to open and close the nozzle for supplying gasolene to the nozzle.

12. In a carburetor tor an engine, the combination of a mixing chamber, having an air inlet through its bottom, a tube provided' with side air inlets, each Ofwhich last named air inlets is larger at its top than at its bottom, a throttle valve having a closed top and a tubular body which is slidable upwardly in the mixing chamber by the sucill) tion of the engine and downwardly bygravity, which side air inlets of said tube and which side inlets of the throttle valve-are closed when the throttle valve is fully seated in said tube, but are open when said throttle 'valve rises by said suction, a nozzle inthe mixing chamber, whose discharging end is adjacent to the lower edge of each of the air inlets of said tube, a needlevalve on the throttle valve adapted toopen'and close the nozzle bore,"a-nd means for supplying gaso- .jbinat-ion of a mixing chamber having air inlets in its-bottom, a tube from the mixing chambenprovided with side air inlets; an

lene to the'nozzle. vl3. In a carbureter for an engine, the

combination ot a mixing chamber having conically flaring sides and also having a bottom with air inletsytherethrough, means for regulating the quantity of air passing inwardl through the bottom air inlets of themixmg chamber, a tubular pipe mounted in the mixing chamber and having side air inlets, a throttle valvei-having atop which is normally 'in position flus'h with the top edge of s'aid pipe andjalso having a body which is slidable in the pipe by the suction of the enginaand provided with side'mixture outlets near said top, which said. air inlets of the pipe and. said mixture outlets of the throttle valve are closed when the throttle valve is fully seated in said pipe but are open when the throttle valve rises by said suction, a nozzle mounted in the mixing chamber and having its discharging end adjacent to the side air inlets of said pipe,

a needle valve on the throttle valve adapted to open and close the nozzle bore, and means for supplying gasolene. to said nozzle.

14. In a carbureter for an engine, the combination of an outlet. pipe from the mixing chamber to the engine; a mixing chamber having an air inlet in its bottom and also a tube from the mixing chamber provided with side air inlets; a throttle valve having a closed top and also a tubular body which is slidable in said tube by the suction of the engine, which side air inlets of the tube and side air outlets of the throttle valve are closed When, the throttle valve is fully seated in the tube, but are open when the throttle valve. is partially raised inv said tube by thev suction of the engine; a nozzle in the mixing chamber having a bore whose discharging end is located adjacent to the said air inlets of the tube; 1a needle valve carried by the throttle valve and adapted to open and close the nozzle bore; means of supplying gasolene to thenozzle; and means for regulatingtheicurrent of air passing.

through the side air inlets of said tube and through said air outlets of the throttle valve. a

15. In a carbureter for an engine, the comoutletpipe from the mixing chamber to the engine, a throttle valvehaving a closed top and also a tubular body which is slidablein said tube by the suction of the engine,

which side air inlets of the tube and said air outlets of the throttle valve are closed.

the tube; aflneedle valve carried by the throttle valve and adapted. to open and close the nozzle bore; means for supplying gasolene to the nozzle; and means for regu- ''lating the current of air passing through the bottom air inlets of the mixing chamber.

16, In a carbure'ter for an engine, the combination of a mixing chamber, an outletpipe from the mixing chamber to the engine; 'a tube mounted in the mixing. chamber; a throttle valve having a closed top and a tubular body slidable in "said tube by the suctionof the engine; a nozzle in the mix ing chamber having a bore; a needle valve carried by the throttle valve and slidable.

in said bore; means for supplying gasolene to the nozzle; means for supplying atmospheric air in a vertical current into and through said mixing chamber into the tubular body of the throttle valve; and means for supplying atmospheric air in horizontal currents into said chamber substantially at right angles with said vertical vair currents, which vertical and horizontal air currents in meeting each other-at or near the discharging endof the nozzle areadapted to break up the gasolene jet "from the nozzle into spray to make carbureted air.

' In testimony whereof I affix my signature in presence of two witnesses.

ALBERT HOWARTH. Witnesses:

JOHN J. LACE, Jr.,

WARREN R. Pnncnr