US1435947A - Said morse - Google Patents

Description

J. L TRACY AND L. H. MORSE.

CARBURETOR. APPLICATIONl FILED IUNE 30 I9|6 BENEVIED APR 8| 19l8.

1;435,947, Patented Nov. 21, 1922.

2 SHEETS-SHEET l.

Kwok/Vey@ J. J. TRACY AND L. -H. MORSE.

CARBURETOR. APPLICATION FILED JUNE 30. 1916. RENEWED APR. 8, 1918.

1,435,947, PawndNov. 21,1922.

2 SHEETS--SHEET 2.

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l #T7-@ENE wconstruction the member head 2l on said .'.rneinberu the being` such that upon rotating 16 so as to slightly loosen the same in the casing, said sleeve 20 may be rotated and lett in any desired angular position with respect to said casing.

Surrounding the duct l0 and the upper end oll the nozzle ll so as to be freely slidable thereon a tubular member or sleeve 253 constituting; in efliect an annular valve which rves to partially close the annular space .activ-een the duct andthe surro'unding` casiviill. This valve is adapted to be raised. Yfrom the normal posit-ion. in which it shown in lull lines in Figure l, to the posi.- tion indica-ted in dotted outline, or any intermediate position by means ot a. rocker mounted in the horizontal portion ot the casino' end connected te said valve by a link QT.

Fitted vvithin the upper portion of the casinga so to be freely slidable therein, is a second tubular member or sleeve 30, the lower end ot Which constitutes in etlect :i second annular valve that, in the normal position of suid member7 .illustraI "'l in sait` lliofure l, surrounds said first .ned auuular valve and substantnilly completely shuts ell communication between the uiper and lower portions oi the casing. il. pirdetcrn'uned vert-ical movement ol this last named valve, however. will leave an annular opening' as will be obvious. the size ol such oiiening` increasingrg' as the valve continues such upward moveme it., vvhilu the point at which the opening lirst occurs do pends upon the setting' oit the lirst named annular valve. il shoulder 3l on the outer Wall ot the valve acts to reduce the space within an annular chamber lett between such wall and the adjacent inner "-.vall ot the casiugn upon upward movement ot the nlve. tlurh chainbc has communication with thlx atmosphere through u lateral opening` 33 (lligni rc E2) controlled by a Weighted plunger lfl. which ijiermits in'low ot air to the chainber. restrains the out'lloiv ot such air, so that the etl'ect is to dumpen the increment ot the 'valve 30, preventing` any sudden or ecce ric action on its part.Y

m screw 9 previously referred to as ing; the abutment, with which the ach J Y screw S in the lever 5 contacts.; closes the opening` that requires to be provided to permit the valve 34s to be put in place.

`Centrally mounted in the annular airvalve 8O by means ot spideiiarins 35 is another valve 36 for controlling` tho opening|`- in the fuel-supply nozzle ll. The body 37 of this valve is coned on its under side to lit the beveled discharge oritice iu such nozzle, and is further provided with a relatively adjustable spindle or needle-valve entensiofn 38 threaded in said body and.

adapted to project ivithin the bore l5 ot the nozzle. This extension is tapered lgradually troni one end to the other save tor a short cylindrical section 259 irninediateljfY .diiiceut the coned valvcbody, such cylindrical section boing adapted to lit the aforesaid llore to entirely shut olli the l'loiv oivr .Vuol therethrough until the valve body has been raised it slight predetermined distance,

' llheacu pon the tapering` portion oli the valve :f

but is verti 1.." reciprocable relativelyY the* o, being;` normally held. n depressed posnion by means ol a compression spring` Lll) interposed betivien. the valve head and such spider, Furthermore, the valve is loosely Lcd at its upper cud in suoli so as to have a certain. amount of lateral. ploy, welL and thus allow it to propitsel'l" in the nozzle. operation. assumingv the position ot the to be as yillustrated in Figure l, with c annular valve occupying` either the posishown. or a slightly raised position, 1.civending` upon the setting` ot the rr'icltcu" 2li, il' will be observed. that at the same time the air valve BO closes communication through e singt, the fuel-valve 3G is csused to seat in the nozzle so as to shut oli the supply ot tue-l. rl.`he weighted valve 17 in the loivcr cud ot' the l'uel siu'iply duct Vl0 ivill lilfoivisc be seated vin this condition ot2 the device, the oli such valve being?r ranged to slightly exceed the pressure ou lli-w tool vline Whether such AFuel be supplied by a gravity leed system. or from a tank ui der pressure.

lt snould be ciplai. ed` that no lloat chainn :er is reunir', with the device., iuel being ed directly ironi said gravity or nfcssure chamber to the duct by means of the conn ections previously described.

llpon starting the en ine7 the suction, as regulated'by the throttle valve fr, -vill iininediately litt the air-valve and thus the fuel-valve 36, so as respectively to open the annular air passage and litt such Fuel valve sufficiently to open the discharge orilice in the nozzle. The el'lect ot the suction.. thus admitted to the interior ot the duct 10.r Will be to overcome the Weight oi the vulve plunger li', nearly balanced es it is by the pressure oit the fuel., and so permit the fuel. to liovv freely past the saine, and, in regulated amount7 past the fuel-valve proper. This amount will obviously increase, as said fuel valve is raised higher and higher With an lli lOli

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increase in the suction effect of the engine. The air-valve of course is likewise lifted higher and higher, admitting a correspondingly larger and larger amount of air, so as at all times to provide air and fuel in properV proportions. The air or suction,a`ctua.ted valve, it will be noted, has its lower face, viz, the one that co-operates with the annular valve, 25, beveled, whereby the proper pro portions of air and fuel just referred to are maintained, since areas of the openings for passage of fuel and air are varied in predetermined fashion upon movement of said air-valve. The fuel as it escapes from 'the nozzle spread by the action of the conical. face of the fuel-valve into the path of the air current around the nozzle, and thus a very thorough and intimate mixture of the two ingredients of the charge is secured, More exactly, the fuel flows over the surface of the flat upper surface of the valve 25, which, whatever its adjusted position, constitutes in effect` a continuation of the nozzle for the purpose under consideration. The thin film of liquid vaporizes directly, of course, but, more especially, as it reaches the edge of the fiat circular surface in question, the air, here moving at its greatest velocity, whips off `as it were the overflowing liquid into minute particles or spray, which quickly vaporizes in such air current as it passes beyond.

It will be observed that the clear area of the passage in which the air valve 30 oper` ates, is relatively fixed with respect to the clear area of the discharge opening in which the throttle valve l is located, the area of such last namedopening being just a. trifle larger than that in connection with such valve 30.

The modifications in construction shown in Figures 6 and 7, relate primarily to the form of the annular air valve 41, the body of the valve proper being considerably shorter than in the case of the corresponding valve 30 of the first described construction. The central portion 42 of the spider 41?), however, in which the supplemental valve lo is mounted, is considerably larger in diameter than in said first described. construc tion, and operates as a piston in a cylindrical chamber ed: centrally disposed in tie upper portion of the casing l, being there held by means of radial arms Ii5, as clearly shown in Figure 6.

This chamber acts as a dash pot to dampen the movement of the valve in just the same Way as does the annular chamber 32, with the difference that a larger cross-sectional area is obtainable without restricting the passage for the gaseous mixture. A steadier action on the part of the valve results, and it is also easier and simpler to fit the parts together.

The fuel valve 36 is designed to be mounted in the spider in the same 'fashion as before, so as to be capable of a slight relative movement axially thereof, being held normally in depressed position by means of a compression spring fiO, just as before. nasmuch as the valve is preferably loosely fitted in the spider center for the reason previously described, the upper portion of the recess i6 in which the nut 47 that secures the valve in place is located, is sealed by means of a threaded plate 4S so that air can be admitted to and exhausted from the chamber 4A- only through the restricted. passage or vent i9 provided for this purpose.

Rotation of the shaft 5 which carries the butterfly valve l is limited in the fashion as previously, by means of a lever 50 which engages at one end 5l directly with an abutment 53 on the side of the casing and carries at its other end a set-screw 52 adapted to contact with an abutment on the side of the easing.

It will be noted that asv shown in Figure l, a slight space is left between the two an` nular valves 25 and 30, sufficient to allow a small volume of air to be drawn through, even before said valve 8O is perceptibly raised. This is necessary in order to draw the gasoline tl rough the nozzle and provide the initial charge for the engine on starting. Instead of providing for this minimum draft of air in this fashion, or in supplement thereof, the further modification illustrated in Figure 6 may be utilized, consisting in the enlargement of the upper port-ion of the bore of said valve 25, which surrounds the fuelsupply duct and nozzle, so as to leave an annular space 54 which is connected by means of a series of apertures 55 with the lower portion of the casing.

The effect of the suction of the engine, as it is rotated in starting, will accordingly be to draw air through these apertures and such annular space immediately surrounding the nozzle, and thus even more e'ectively than before apply such suction to the drawing of the fuel through the nozzle. his arrangement will be more especially desirable in connection with large-size carburetors. It will be obvious that the ,general mode of operation of the modified construction of the device, including the action of the dash-pot, will be the same as that of the form shown in Figures l to 5 inclusive. Despite the central location of such dashspot, the duct 419 leading from the cylinder l0 opens, it will be observed, into the atmosphere, and thus pre vents the engine suction from producing a variable effect in the operation of the dashpot by varying the pressure in the cylinder, this remaining always at atmospheric.

In both forms of our invention, it will be observed that the adjustment in position of valve 25 does not affect the normal position of the surrounding valve 30 or 4l, as the case ln other words, said valve 25 may be raised without rc singv the snrrounding which co-operates tl'iere'.vith to close tie annular space between tie .noz zle and the casing` wall, and witlou as a consequence, raising the fuel-control. valve CSG, lependinel, however, upon the settingu of' said valve 257 t ie surronnding` valve will require to be raised greater or less distance. by the suction betore air can pass to mix with the 'fuel from the nozzle. ts a result7 it will be seen that when a rich mixture is desired., as on starting' the engine, this result automatically lfollows the raising oil'Y said valve 25 through operation ot rocher This capacity ior wholly independ ,1. movement oit' thc valves in questiorn which may a so be characterized as capacity for movement through approximately the same range ot travel, is believed to be unique in the present device.; both in construction and in the operative effect thereby secured. The construction in question. takes on particular significance where9 as in the several carburetors illustrated. in the drawings, no float-control for the fuel supply is provided.. ln such case, it the adjustment et valve 25 involved the raising?,` ot the needlevalve, the carburetor would be flooded with disastrous results.

l e therefore particularly point out and distinctly claim as our invention :H

l. ln a device oit the character described. the combination of' tubular casino; having` an air .inlet opening; a fuel nozzle discharging' within said casing; two valves cooperatto substantially close the passage through said casing; external operating' means for one oit said valves, the other being` adapted to be moved by the suction of the engine; and a third valve7 operated by said suetion-actuated valve, 'for controlling the supply of tuel through said nozzle, said `first-named two valves beinggj movable independently ot each other, whereby adjustment ot said externally operated valve does not atleet the normal position ot said. suc tion-operated valve nor of said 'fuel-control valve.

2. In a device of the character described, the combination of a tubular casing; having an opening constituting the sole air inlet for the device; a fuel nozzle rising` centrally within said casing; two vertically reciprocable annular valves fitting one within the other and co-operating` to substantially close the space between said nozzle and the casing wall.; external opeiatingl means for one ot' said valves7 the other being adapted to be raised by the suction of the engine; and a third valve7 operated by said suctiim-aetuated valve for controlling the supply ot fuel through said nozzle, said two annular valves being reciprocable independently of each other, vr iereby adjustment oli said enternally operated valve does not atleet-thc normal position of said suction-operated valve nor ot said 'fuel-control valve.

In a device ol the character described, the combination of a tubular casina` having; an air inlet opening; a tnel nozzle rising;F centrally within said casing; an annular valve reeiprocable vertically of said nozzle; external operating` means adapted to position said valve where desired; second annular vertically reciprocable valve surround ing said first valve and adapted in 2o-operav tion therewith to substantially close the space between said nozzle and the casing wall; a third valve operated by said second annular valve for controlling the supply of tuel through said nozzle, said two annularx valves being` reciprocable independently oit each other, whereby adjustment ot said cxternally operated valve does not ailiect the normal position of said suction-operated valve nor of said fuel-control valve; a cenpiston carried by said second annular valveg and a cylinder having a duct communicating;` with the atmosphere, supported in said casing` in position to receive said piston and form therewith dash-pot adapted to dampen the movement of said second annular valve. Y

4i. ln a device of the character described, the combination of a suitable casing having an outlet tor the charge and an air-inlet; a fuel-nozzle rising centrally and discharging within said casing; an externally adjustable annular valve surroundingsaid nozzle and formed and arranged to receive the fuel as it escapes from said nozzle and to discharge the same radially into the space between said valve and casing; and a. second. annular valve adapted to surround said lirst valve and in co-operation therewith to con strict or close the air-passage through said casing adjacent such point of discharge.

Signed by us, this 27th day oil". June, 1916.

Jell/lit ."lllAC/Y. LrlllllljllilCE ll MORSE. Attested by JNO. OBERLTN, D. T. Davms.

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