US976258A - Carbureter. - Google Patents

Description

RQW. GALLAGHER. GARBURBTER.

APPLICATION FILED NOV. 10, 1909.

976,258, Patented N0vj22; 1910.

, 2 snngcrs -siin'm 1 F/ v WITNESSES ATTORNEY a R. W. GALLAGHER. GARBURETER. APPLICATION FILED NOV. 10, 1909.

976,258 Patented Nov. 22, 1910.

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- INVENTOR, m4 g jw ATTORNEY sail RIGHARDMILLIAM GALLAGHER,

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F LOS ANGELES, CALIFORNIA, ASSIGNOR T0 G. 80 H.

MANUFACTURING COMPANY; OF JERSEY CITY, NEW JERSEY.

GARBURETER.

Application filed November 10, 1909. Serial No. 527,227.

specification.

Thisinvention relates to carbureters for gasolene engines and the objectsof the invention are to provide acarbureter of such construction that it will" always supply a given volume of the mixture of gas and air for a given posit-ion of the throttle lever; second, one in which the ratio of the mixture may be varied as may be-desired; third, of such construction as to permit the engine to be started with the throttle -practically closed thereby preventing the engine racing innuediately after starting; fourth, to provide, in such a carburetor, 1neans. 'for flushing the carburetor w-ith 'gasolene, having no connection with the float, so that the accurate actionof the float may not be impaired by operating said flushing means; fifth, to provide means for thoroughly 'inixing the gas and air' before supplying it to the engine, thereby insuring a more steady suction from the nozzles; sixth, to provide means for varying the normal level of the gasolene in the .float chamber; seventh, to provide a construction of float valve by which the float can positively close the same. I

In the accompanying drawing, Figure 1 is a side view of the carburetor; Fig. 2 a transverse section on the line 2-2 of Fig. 3; Fig. 3 is'a longitudinal section on the line 3--3 of Fig. 1 Fig. 4is a plan view Figxl') is a longitudinal section on the line 55 of Fig. 4; Fig. 6 is a perspective view of the air slide valve.

Referring to the drawing, 1 indicates the casing of a float chamber 2, 3 indicates a float valvecasing and at a connection between them.

5 indicatesa cylindrical casing of a mix ing chamber 6 having a substantially cylin-. drical downward:extension 7, fbrming a fixed air supply-chamber 8. i

10 indicates a reservoir or mixing dome, and 11 a passage bet-ween the reservoir and mixing chamber. Said dome is formed with a horizontal circular flange 12 by which the carburetor can be secured in the proper poforce the valve. to its seat to sition relative to the engine, and with a circular depending flange 18 to which is secured the upper edge of the float chamber. Into the lower end of the valve casing 3 is screwed a small T-shaped casting 14 formed with a vertical bore 15, its lower end being adapted to'be connected with a pipe for. supplying gasolene to the carbureter, and its upper end being formed into a valve seat 17. Said casting is also formed with a lateral apertured extension 18 to which is connected a tube 19 leading to a small valve casing 20 screwed 'into the side of the reservoir, and adapted to be closed by a needle valve 21. The object of this tube and needle valve is to enable gasolene to be admitted direct, when desired, to the reservoir or mixing dome to flush said ervoir, thus making the engine easy to start at all times. lvlorcm'cla'an important advantage ot' this independent gasolene flushing attachment is that it is no longer necessary to provide a connection with the float, but the latter can now be free. It is necessary with most. carbnreters to provide means, connected with the float, for opening the valve of thb gasolene supply, when necessary to obtain an initial supply of gasolene vapor to start the engine. Such a connection impairs'the accurate action of the float; so that it is very liable to need adjustment, which is not an easy matter after it isoii'ce out of order. By interposing the mixing dome between the mixing chamber and the engine, a very steady suction is created, which. in turn, causes the air and gasolene vapor to be'well and thoroughly mixed, so that. the engine runs smoothly and steadily.

The "valve seat 17 is adapted to be closed by a main supply valve 22 which is screwed within a sleeve 23, which sleeve extends through a collar 24 screwed into the upper end of the casing 3, and the sleeve-has a. shoulder 25 adapted 'to abut against the lower:

.end of the collar to limit the upward move-- ment ofthe sleeve. Said valve 22 has a stem 26 extending upward through the end of said sleeve, and carrying at its upper end a head 27, by which said valve can be, conveniently screwed in said sleeve for ad ust-1 ment, said stem 26 being threaded at its up per end, and a nut 28 being screwed on said threaded end for the purpose of locking said stem in the position to which it is adjusted within the sleeve. Said sleeve is formed near its lower end with a circumferential groove 52.) which is engaged by the end of a lever 30 pivoted on a cross pin 31, the other end of said lever carrying a float 32 within the float chamber. lly reason of the groove 2%), the valve is not only raised from its seat when the float falls, but is also forced down on to its seat when the float rises, instead of merelv finding its seat by its own weight.

B the above arrangement. the level of the gasolene in the float chamber is maintained constant, as, when the float rises to a certain pre-determined level, the valve 22 is closed, and when it falls below said level the valve is opened to admit-more gasolene. Moreover, this level can be varied by adjusting the valve within the sleeve :23.

From the bottom of the float chamber a pipe 33 leads to a small casting 34C screwed into the extension .7, said casting 34 being formed with'a vertically extending gasolene conduit 35. Said gasolene conduit terminates at its upper end in two 'alve seats 3t), 37, of which-the seat 36 is adapted to be closed from below by a set valve 38 screwed through the lower portion of said casting H and extending upward in said conduit, while the other valve seat 37 is adapted to be closed from above by a downwardly extending gasolene throttle valve 219 screwed through a sleeve -lt), which itself is l'ormed on the outside with relatively coarse threads, and is screwed through a bearing 41 therefor, formed upon the evlindrical casting 5 of the mixing chamber. The lower 'alve 38 is al ways open, and is provided with a suitable head 42 by which it can be adjusted by hand so that a sutlicient amount of gasolcne will flow past the valve seat 3t; into the mixing chamber to start the engine, but said set valve does not furnish gasolene for the regular running of the engine a t'ter it has been started, the gasolene for regular running be-' ing admitted by the gasolene throttle valve 39. Said valve 35) is also provided with a head 59, by which it can be turned withinthe sleeve 40, but it does not turn normally therein, but only for the purpose of adjust- Inent, being locked in its adjusted position in the sleeve by a lock nut 43. By loosening the lock nut, the .valve may be adjusted by screwing it up or down in the sleeve 40. The valve 39 is opened or closed by the turning of the threaded sleeve 40 within the in ternally threaded bearing 41, and this turn- .ing is effected by means of a slotted rockarm 44 secured to the sleeve, and in the slot of which arm is adjustably secured a bolt 45 which itself is secured to the end of a link 46 the end of which passes sl'idably through a block 47 which is revolubly mounted upon an arm 48 extending obliquely upv ard from a stem 49 having a forked end to enable it to be suitably connected to a throttle lever, not shown. Thus, by the movement of the rock arm, the sleeve 40 is turned, and therefore also, on account of its threaded engagementlindrical shell or air valve 51, which is formed with upper and lower longitudinal slots 52. 5 of such length as to permit said valve 51 to move through its full stroke 211- ,though the valve 39 extends diametrically across the valve 51.

' The lower chamber 8 is formed with an air port which is always open to admit air to said lower chamber, and thence thrtmgh the slot So in the valve to the mixing chamber. The air thus admitted is sutticient for mixture with the gasolene. The cutaway portion 67 is made sutliciently deep, as shown in Fig. 2-5,. that its inner edge is, even when the valve 51 is closed, slightly beyond or inside the outer edge of the passage 11 leading to the reservoir or mixing dome 10. Thus, even when the valve 51 is closed and the gasolene throttle valve 39 for the gasoleno is shut oil, a narrow opening is left to! the passage of a limited quantity of t-ommingled air and gasolene vapor, ad-

mitted respectively througlrtlie port 55 and valve seat ll for starting the engine. As the shell 51 slides outward, 'the sleeve 40 is turned to open the valve 39, admitting gasolene past the valveseat 37 into the mixing chamber. To admit air to mingle therewith. the sideo t"--the mixing chamber is formed with an air port 58, which in form is an isosceles triangle, having its apex close to the closed head (30 of the mixing chamber and its base remote therefrom. As the hollow valve. is withdrawn from the closed head, more and more of said opening is uncovered. admitting more and more, as may he desired, of the air into the mixing chamher. The air thus admitted and mixed with the vapor-of gasolene admitted through the valve seat 237 flows by the cutaway portion (37 of the valve-51 and by the passage 11 to the mixing dome or reservoir 10, and from the reservoir 10 the mixture enters the indnction pipes, not shown, by which it is conducted to the engine cylinder or cylinders.

The link 46 has a head 64 which bearsjusting the end of the link 46 on the slotted arm 44;, thedesired ratio of amplitude of movement of the valve 39 to that of the valve 51 may be secured.

has been started, the

- After the engme gasolene throttle valve is opened to admit more gasolene, and at the sametime the air valve is opened to a corresponding extent to produce the requisite mixture. Gasolene will now enter almost entirely through the gasolene throttle valve, although the set valve is also open. This is due to the'""'fact that the conical endof the throttle valve points downward in its seat, whereas the conical end of the set valve points upward. This'arrangement causes the suction around the conical end of the gasolene throttle valve to increase downward, whereas that around the conical end of the set valve decreases downward. Hence the'suction from the engine on the gasolene in; the gasolene throttle valve is greatly increased, whereas that in the set valve is greatly decreased.

The following advantages arise from the above described provision of the set and gasolene throttle valves. be started with thegasolene throttle valve practically closed, which prevents the engineracing immediately after starting, as is the case with most other carbureters. On account of the form of the air port at the side' of the mixing chamber, the amount of air admitted therethrough is at all times substantially proportioned to the gasolene admitted by the gasolene throttle valve,

however wide the latter may be opened, thus giving aperfect mixture at all positions of the throttle. At the same time, the means for admitting the gasolene are adjustable to give any quality of mixture desired, regardless of the condition of the atmosphere. Again, since only a given volume of mixture will enter the engine at a fixed position of the throttle, regardless of the momentum of the engine, the engine will not race when theclutch is released.

I claim 2- 1. In a carbureter, a float chamber, a float therein, a valve for admitting gasolene to the float chamber, an operative connection between said float and valve to maintain said float at a uniform level, a mixing chamber for mixing air and gasolene vapor, a valve .5

for admitting gasolene from the floatcham her to the mixing chamber, a mixture reser- ,voir, connected with said mixing chamber,

andlhaving an openingthrough which the The englne may V engine can be supplied, and means, inde pendent of said mixing chamber, for flushing the reservoir with gasolene, substantially as described.

2. A float chamber, a float therein, valve means, controlled by the float, for admitting gasolene to the float chamber, a cylindrical horizontal mixing chamber at one side of the float chamber, a reservoir above the float v chamber communicating with the mixing chamber, a gasolene passage from the float chamber to the mixing chamber, an adjustable set valve, an opening of variable size between the gasolene passage and the mixing chamber, a throttle valve extending through the mixing chamber for controlling admission of gasoleneto the mixin chamber, the mixing chamber having a si e opening for air admission and also an opening in the bottom, the latter being always open, a valve in the mixing chamber for regulating the side air admission opening and admission of mixture'to the reservoir, a sleeve threaded in the casing of the mixing chamber, said throttle valve having its stem screwed in the sleeve, an arm clamped to the sleeve, a link adjustably attached to the arm, a stem on the air valve, and means connecting the air valve stem and link permitting a limited relative movement, substantially as described.

3. A float chamber, a float therein, valve means, controlled by the float, for admitting gasolene to the float. chamber, a cylindrical horizontal mixing chamber at one side of the float chamber, a reservoir above the float chamber communicating with the mixing chamber, a gasolene passage from the float chamber to themiXing chamber, an adjustable set valve giving an opening of variable size between the gasolene passage and the mixing chamber, a throttle valve extending through the mixing chamber for controlling admission of gasolene to the mixing chamber, the mixing chamber having aside opening for air admission and also an opening in the bottom, the latter being always open, a valve in the mixing chamber for regulating the side air admission opening and admission of mixture to the reservoir, an arm attached to the air valve stem, a block journaled in the end of said arm, a link passing through the block and having a head, and a coiled spring bearing against the block and secured to the link, substantially as described.

In testimony whereof'l have hereunto set my hand in the presence of two subscribing witnesses. 1

RICHARD WILLIAM GALLAGHER.

VVitnessesz- JOHN KEATING, FRANCES G. THo n

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