US1103930A - Carbureter. - Google Patents

Description

A. C. BENNETT.

GAEBUBETBR.

urmcnrox rrnnn JULY 1, 1912.

Patented July 21, 1914.

ASHLEY C. BENNETT, F MINNEAPOLIS, MINNESOTA.

CARBURETER.

To all whom'z't may concern :v Be it known that I, ASHLEY C. BENNETT, a citizen of theUnited States, residing at Minneapolis, in the countyof Hennepin and State ofl-Mmnesot'a, have invented certain l' new and useful Improvements in Carbureters,l of which'the following is a specification.

. invention relates to carbureters, and has for its object to provide a special type of'closure for the valve or inlet port for the air supply, such that the degree of opening of said inlet port will be automatically varied to the speed ofthe engine and consequent-,rate of ow of air through the carbureter, -while at the same time the oil level in the oil chamber 'of the carbureter receptacle will be keptat a constant level. l

The full objects and 'advantages of my invention'will appear in connection with the detailed description thereof and are particu lary pointed outin the claims.

The Igure of the drawing, illustrating the application of my invention in one forni,

consists primarily of a section through a -carbureter having my invention applied thereto.

Asshown in the drawings, a. casing 1 incluses a chamber 2 for receiving the gasolene or other fuel oil through an aperture 3 in a plug 4 screwed into the casing 1 and in combination with the needle 5 compris- .ing aneedle valve mechanism of well knownl construction, the plug 4 having screwed i The bottomof the casing thereon a cap 6 which forms a union with an elbow '7 having connection with a source of fuel supply, not shown. 2. may, if desired, be closed by a cap 8 lfor permitting i'eadyaccess` to and the assembling of parts vwithin chamber 2. The casing 1 is provided ling regulated with a. transverse partition 9 which separates theoil chamber 2 from `ari-air and mixing chamberl 10. The chamber 10 is connected bye passage 11 to a. pipe 12 which, by connections'not shown,

leads vto the cylinder the openingin Said pipe-beby a throttle valve 13 of Anf air inlet pipe 14 of the engine,

usual construction.

opens through a port 15 into mixing'chamber 10, said port having formedon the lower side thereof a valve seat 16 against which is l `adapted to seat the disk '17 of a check valve,

the stem' 18 of which passes through a guiding aperture 19 in partition 9 into the oil chamber 2; l

specification of retterratent.

`Patented July 21, 1914.

Application led July 1, 1912. Serial No. 706,908.

The needle 5 has connected thereto by a ball and socket joint 2O an arm 21 which is pivoted at 22, and anfa'rm 22E-integrally connected with arm 21 extends'in the opposite direction from pivot 22 and has a yoke Q4 on the end thereof embracing the stem 18. A lfloat 25 rides upon the `liquid in the chamber 2 which has afiXed level, as indicatedat 26. This float is providedwith an aperture 27 which loosely surrounds the 'stem 18, the upper part of the iioat engaging the yoke :24 so that when the gasolene or other liquid fuel in the container rises to the level 26 `the float will operate to 'close the needle valve, but as the level of Vsaid liquid is caused to fall byuse thereof the lvalve'will be opened so that fresh supplies are radmitted and the level within chamber 2 is kept practically constant. The stem 18 extends centrally through a float 28 which may consist of cork 'or some other buoyant material, or be a hollow metal container, so long as its buoyancy will be of such degree at all-'times as to maintain the disk 17 in engagement with the vvalve seat 16 with a predetermined pressure which' shall be just sufficient to keep the port 15 closed to the extent required to regulate the influx of air to the draft or speed of the engine. The iioat 2S may be cylindrical in cross section if chamter 2 is cylindrical, as is usually the case, inwhich eve-nt a sufficient passage-way E29 will be left so that as float Q8 rises and falls within chamberEZ there will be plenty of room for the-passage of liquid around the iioat from thelupper to' the lower partof the chamber` and yvice versa, with sulhcient rapidity to prevent fluctuations vof the liquid surfaoef 26. To

steady the float QS a pin 30 may bei secured centrally to .t-heF-bdttom cap extending up within chamber-2 and centrally within stem 18 positionedfinuloat 28, which'stem is preferably made 'hollowr for thaty purpose. 'ln'v case a hollow metal float is employed the stenravilltnot need to extend through the body of the float but may be secured ydirectly to the top, and the pin 30 will operyate in afchannel or way formed inthe float.

lt isobvious that the same .result-s of steadying the float and permitting vready movenient of liquid above and beneath the same may be effected by causing t e float /to engage or come close y'to the wal s of chamber 2 and arranging a by-pass from the liquid either directly through or along the margins of the ioat or through a separate passage outside of chamber 2 in a Well known manner.

In some instances it is desirable to` have a second air inlet port entirely open which is suiciently large to admit enough air for' the slowest engine speeds, and such a port is. indicated at 31. The liquid fuel is fed into the mixing chamber through an pright tube 32 connected by a passage 33 with chamber 2 and having aseries of apertures 34 in the walls thereof through which the fuel is drawn by vacuum created by the draft of air through the mixing chamber,

the tension of this vacuum increasing in proportion to the increase in speed of the 4in tube 32 and port. If there is no second engine so that the liquid is drawn up farther resented to an increas ing number of sai apertures to be fed at a corres ondingly increased rate in proportion to said) degree of draft. The bottomtube 32 is surrounded by acup 35 having the bottom thereof slightly below the level 26 of the fuel in chamber 2 so 'that a certain amount of liquid will normally be exposed `within this cup and excess of liquid drawn out through apertures 34 may pass back through said apertures positioned within the cu into the passage 33,' all of thesefeatures eing .shown and claimed in my Patent Number 927,211, dated. July 6,1909.

`When used either with or without the extra air passage 31 it may some times balppen that it will be desirable to vary t e closin'fg pressure exerted upon valve disk 17. To e ect., this I may provide a socket 36 from the bottom of which engagingwith disk 17, said .pinhaving thereon a; collar 38 slidable within the socket 36, a sprin 39 surrounding the pin 37 and engaging t e collar 38 so as to press the pin outward with a pressure which may be adjusted by means of a screw head, 40 the faceof which engages the upper end of -spring 39. By this means, when' it is de-4 sired to use the carbureter under somewhat radically different conditions, the pressure of disk 17 rupon valve seat 16 maybe regulated asdesired or even the disk 17 maybe held entirely out of engagement with lvalve seat 16 so asto leave a certain determined opening through the port 15. To prevent the suction ofthe air draft. in chamber 11 operating to raise the level of liquid fuel in chamber 2 a small air port 41 is formed in the wall of 'casin' 1 at a point near the topof chamber 2 an above the fuel level 26.

In operation, when the engine is running at slow speed, ifport 31 is employed most or all of the air may be drawn through that port the air will enter through port 15 pushing down the disk 17 and float 28. As the s eed of the engine increases so that the feedJ Ition und prevent such fluctuation.

projects a pin 37 e of the air neces;`

sarily must be increased the rush of air.

ever,.be quick fluctuations of'the disk 17,

as is thecase ywhere the valve member isl spring-controlled,-1sincethe inertia -of the Aliquid which mustbe displaced and moved from the top tothe bottom of float 28, or vice versa, as said Iioat changes its position, will hold-the valve disk 17 in constant posi- It is noted that the ioat 28 is at all times submerged in the liquid of chamber 2. It cannot, therefore, operate to Vchange the level of said liquid. As herein shown, the float is submerged in the liquid 'which comprises the fuel of the engine. VIt is obvious7 yhowever, and falls within the scope' of my inven" tion, that the float 28 might be pbsition'ed in u chamber supported from the fuel chamber of the carbureter in which some other liquid than that which comprises the fuel might be employed.

I claim:

1. A carbureter comprisindr acasing having an air inlet port and ava ve member for closing the same, said valve member including a stem, a receptacle for the'liquidfucl formed in the casing and separated fromv-v the air chamber of the carbureter into which receptacle said stem projects, means for maintainlng the vliquid fuel 'at'a 'constant level within the receptacle including a float sus- 'i tained upon the surface" of said liquid, said valve stem extendin centrallj'through said float, a second float 'beneath the'rstnamed in the li uid to "wll'iichv iioat and submerged the valve stem is connectedV orpositi'oning' the valve member. I

2. A carburete'r comprising a casing'ha-w ing an air inlet port wlth a valveseatsurrounding' the same and a valve -membe'rengaging said valve seat for closing the port,

means for yieldingly holding the valve member in engagement with the valve' seat, a sliding member engaging the Valveme'mber, a spring for actuating the ysliding member tofmove the valvemember against the force i of its positioning means,VA and 'means to` 'a`d just the force exerted 'bysaids'prings A c'arburete'rcomprising a casing having an air inlet port witha valve seat 'surrounding the same anda valve member engaging said valve seat for closing the port, means for yieldingly holding thevalve'member in engagement. with the v alve seat, said casing being pro vided with a' socket extending over theport into proximity with the Ivalve member, a pin slidable in said socket and engaging the valve member, a spring in said socket tending to force the pin outwardly, and means to vary the tension-'of the springl-v ingnn.. air inletport enii'ounded by a Valve aviilveinelnber for engaging said seat t .the port, a receptacle partially filled 1131 liquid, a float- Submerged in said liquid for connection with the' Valve mev lille ber for holding the same in Contact Wit valve Seat at a predetermined pressure, and

yielding means engaging the valve memloel` and tending to move thewssgime out of engage- In testimony whereof I affix my signature in the presence of two Witnesses.

ASHLEY C. BENNETT.

lVitnesses.

F. A. WHITELEY, H.- A.. BOURNAN.

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