US1222131A - Carbureter. - Google Patents

Description

C. L. RAYFIELD. CARBURETER. APPLICATION FILED AUG-28. I9I2.

Patented Apr. 10, 1917.

4 SHEETS-SHEET I.

C. L. RAYFIELD.

'CARBURETER. APPLICATION FILED AUG.28. 1912.

Patented Apr. 10, 1917.

4 SHEETS-SHEET 2.

C. L. RAYFIELD.

CARBURETER. APPLICATION FILED AUG-28. 1912.

1,222, 1-31 0 Patented Apr. 10,1917.

4 SHEETS-SHEET 3- 6 h" 6E o f T J5 w I J v f6 i I M 5* l I IV i I I r C. L. RAYFIELD. CARBURETER. APPLICATION men AUG-28. 1912.

Patented Apr. 10, 1917.

CHARLES L. RAYFIELD, or CHICAGO, ILLINOIS.

CARBURETER.

Specification of Letters Patent.

Patented Apr. It), 191?.

Application filed August 28, 1912. Serial No. 717,541.

To all whom it may concern:

Be it known that 1, CHARLES L. RAYFIELD, a citizen of the United States, and a resident of the city of Chicago, county of Cook, and State of Illinois, have invented certain new and useful Improvements in Carbureters; and I do hereby declare that the follow ing is a full, clear, and exact description of the same, reference being had to the accompanying drawings, and to the numbers of reference marked thereon, which form a part of this specification.

This invention relates to carbureters of that class set forth in my prior application for patent for Carburetors, filed on the 8th day of Dec., 1909, Serial No. 523,114, and in which the mixing chamber received its supply of air from ports, some of which are equipped with valves and positioned to direct the inflowing air to or across the jet of the hydro-carbon as admitted.

In vehicles and in boats the speed is controlled by the operator in part by the throttleor, in other words, by varying the quantity of fluid admitted into the cylinders of the engine or motor and most carbureters are capable of supplying the requisite amount of mixture to operate such an engine at any predetermined speed. Variation from this speed either to a higher speed or a lower speed tends to vary the richness of the mixture and in consequence such engines usually work less perfectly at any other than the speed for which the carbureter was adjusted. This is particularly true with multicylinder engines whether of the four cycle or two cycle type, owing to the practically constant draft upon the carbureter for mixture to supply the combustion and with such engines it has been a matter of great difiiculty heretofore to provide the mixture as required from a single carbureter. After the carbureter is adjusted for high speed the constant shifting of the throttle from high speed to low or vice versa may result in one or more of the cylinders missing fire, indicating loss of efficiency.

Ihe object of this invention is to aiford a carbureter adapted to supply a mixture of practically uniform richness at any and all speeds of the engine or, in other words, in any and all degrees ofopening at the throttle and whereby adjustment of the valves is effected simultaneously with the adjustment of the throttle.

It is also'an object of the invention to afford a construction in which the supply of the hydro-carbon fuel and the air supply are regulated simultaneously, each with reference to the other to afford a variable and regulable inlet supply of both.

It is also an object of the invention to afford a construction by the use of which the air supply in the carbureter is mechanically increased or varied to correspond with the throttle adjustments and to afford means for regulating or adjusting the mechanism to enablethe supply and richness of the mixture to be regulated by means of the throttle to the requirements of the engine at any running speed.

The invention in its preferred form is hereinafter more fully illustrated and described.

In the drawings:

Figure 1 is a side elevation of a carbureter embodying my invention.

Fig. 2 is a top plan view thereof.

Fig. 3 is a central vertical section taken therethroughand showing parts in elevation. I I

Fig. 4 is a section on line ll of Fig. 1.

Fig. 5 is a detail view in elevation of the cam lever for actuating the auxiliary air valve.

Fig. 6 is a section on line 66 of Fig. 1.

Fig. 7 is-a section on line 7-7 of Fig. 1.

Fig. 8 is a view in elevation of theside opposite that shown in Fig. 1.

Fig. 9 is a section on line 99 of Fig. 2.

Fig. 10 is a section on line 10--10 of Fig. 2.

Fig. 11 is a section on line 1111 of Fig. 8.

Figs. 12, 13, 14:, and 15 illustrate a side elevation and sectional details (the latter on lines 1313, and 1515, of Fig. 12) of a modified auxiliary valve.

As shown in the drawings:

Said carbureter comprises connected casings 1 and 2, affording a fioat feed chamber A. and a mixing chamber B. Said chambers, as shown, are cylindric. lhe casing 1, for the float feed chamber comprises cylindr1c side walls, and an integral bottom wall 3, having a central or axial downwardly d1- rected tubular boss 4, integral with the bottom thereof, and opening upwardly thereinto, and closed at its lower end by means of a screw plug 5, threaded thereinto, and engage a suitable packing washer 6, between the same and the end of said boss to seal the same.

The cover 7, for the float feed chamber, is removably secured thereto, and extending axially through said chamber, and a suitable central aperture in said cover, is a rod 8, of a length to extend into the bore in said boss 4, as shown in Fig. 3, and to normally extend slightly above the cover. Adjustably (but rigidly) secured on said rod, is a float 9, in the present instance shown as constructed of sheet metal, and

having a sleeve 10, extending centrally therethrough, and through which the rod 8, extends. Said float feed chamber, is cored from the side adjacent the mixing chamber, to afford an inward extension C, of the chamber in the space between the same, and

said mixing chamber, and, as shown, the casing of the mixing chamber B, is con-, structed to afford a rearward extension D of the chamber extending over said extension of the float feed chamber C, and to the wall of the float feed chamber.

The bottom of said extension C, of the float feed chamber, is provided with an aperture therethrough, and threaded therein at its upper end, is a cylindric plug 11, which serves to close the bottom of that portion of the float feed chamber and is provided with a central upwardly opening recess or bore therein, communicating with a restricted central bore extending therethrough, which affords the seat for the inlet needle valve, through which the flow of the hydro-carbon fuel into the float feed chamber is controlled. Said plugis provided on its lower end, with a peripheral downwardly extending internally threaded flange 12, and threaded thereinto is a hollow connection 13, having a screen 14., stretched across the top thereof. The induction pipe 15, whereby the gasolene tank communicates with the float feed chamber is threaded into said connection 13.

The horizontal partition 16,between the extension D, from the mixing chamber, and the extension C, from the float feed chamber forming the bottom of one and the top of the other is provided with an aperture therethrough, and threaded therein in alinement with the corresponding seat in the plug 11, is the tubular nozzle or jet pipe 17,

the upper end of which extends above the floor 16, in said extension of the mixing chamber and the lower end of which extends below said partition 16. Slidably and loosely engaged thereon in the extension C,

of the float feed chamber, is a sleeve 18, which, near its lower end, is restricted and tapered to a point to afford the valve closure 19, to seat to close the induction passage through the plug 11. Said sleeve 18, is provided with apertures 18 therein slightly above the bottom of the float feed chamber, to admit the fluid from said float chamber thereinto, and a peripheral flange 20, is provided on said sleeve intermediate its ends, as shown in Fig. 3. A weak spring 21, is engaged around said sleeve and bears at its upper end on the wall 16, and at its lower end on said flange to hold the lower needle valve normally closed when the float feed chamber is sufliciently full to support the float.

Removably secured in the float feed chamber on the bottom thereof, is a bracket 22, and pivotally engaged thereon is a lever 23, the shorter end of which is yoked to engage around the sleeve below the flange 20, and the longer end of which is provided with an aperture therethrough to receive the rod 8. As shown, a diametrically apertured ball 24, is rigidly secured on said rod 8, and seats on said longer end of the lever 23, to afford a self adjusting bearing for the float on said lever. I

Said plug 11, is provided with a vertical passage 25, extending downwardly from its inner end to an annular passage 26, extending around within the same, and a shaL low cup 27, preferably metallic, and secured on the bottom of the mixing chamber by means of bolts 27*, and spaced a distance therefrom, as shown in Figs. 1 to 3 inclusive, is provided with an integral arm or extenson 28, having a bore therethrough, in which said plug 11, fits closely.

As shown, a packing washer 29, .is provided above and below said arm, and through which said plug extends to seal the joint therebetween. A passage 30, extends through said arm and communicates with the peripheral passage of said plug and communicating with said passage and extending through said cup or saucer to near the middle of the mixing chamber, is a tubular jet nozzle 31. As shown, a cap screw 32, is set in the under side of said saucer or cup co-axially with said n0zzle or jet, to afford access thereto for the purpose of cleaning or in assembling.

Integral with the rear wall of the mixing chamber or,'i'n' other words, directed toward the float feed chamber, is a bracket or arm 33, having a cylindric seat in the under side thereof co-axial with the bore of the jet nozzle 17 and engaged therein at its upper end, and extending through the top wall 34, of the extension D, of the mixing chamber, is a needle valve closure 35, for said jet nozzle 17. A spring 36, engaged in said seat in the arm 38, bears on the upper end of said needle valve closure to hold the same normally seated.

Journaled in asuitable bearing on the rear wall of the mixing chamber, is a transverse shaft 37, and secured thereon and projecting into a slot in the stem of the needle val've closure 35, is a finger 38, which acts with the rotation of said shaft 37, to raise said needle valve closure against the tension of the spring 36.

At the upper end of the casing affording the mixing chamber, is provided an outwardly extending flange 39, which may be apertured to afford engagement with the manifold pipes leading to the engine. Extending through said mixing chamber are parallel shafts 40 and 41, above and below the extension D, of the mixing chamber respectively, and rigidly secured thereon are butterfly valve closures 42 and 43, respectively. The upper butterfly valve closure 42, is slightly cut away on one side thereof to afford a sufficient passage for the mixtrue to the manifold pipes to support combustion when the throttle is substantially closed or at its lowest running adjustment.

The lower butterfly valve closure 43, is slotted on its front edge to receive the jet nozzle 31, therein, as shown in Fig. 3, when the valve is closed, and is also slotted at its opposite side and provided with a downwardly extending boss or projection 44, to which is pivotally engaged the lower end of a rigid link or connecting rod 45, the upper end of which is pivotally engaged on a corresponding projection 46, on the upper butterfly valve closure, so that adjustment of one of said valves by the rotation of the shaft thereof, necessitates an adjustment pf 1the other through the medium of said Secured on the outer end of the shaft 40, is the throttle lever 47, whereby said shaft may be rotated, and said butterfly valves adjusted. Alto rigidly secured thereon is a rectangular block 48, at the inner side of the throttle lever, and slidably and adjustably secured thereon is a cam 49, comprising cam faces arranged approximately at right angles to each other, and the angle formed thereby cut away to afford a rounded continuation of the cam, as shown in Fig. 9. A screw shaft 50, journaled in the ends of said cam block, is threaded through said block 48, and extending through a notch in the shaft 40, is provided on its outer end with an adjusting wheel 51, whereby the cam may be shifted on said block with reference to its center of rotation, to-wit, its shaft 40. One end of said screw shaft 50, is milled, and yieldingly engaged in the adjustable cam block, is a spring pressed detent 52, adapted to engage the milled surface of the shaft to hold the same in adjusted position.

Loosely engaged on the shaft 37, for adjusting the needle valve closure 35, is a downwardly and forwardly extending arm 53, provided at its forward end with a hearing plate 54, removably secured theredn and engaging said movable cam member 49, and adapted by engagement. therewith to actuate said lever and the shaft 37, to operate said needle valve. Integral with the arm 53, is a downwardly extending arm provided with a set screw 56, extending therethrough and rearwardly beyond the same.

Rigidly secured on said shaft 37, by means of a bracket arm 57, is a sleeve 58. Journaled in said sleeve is a shaft 59, having rigidly secured on the lower end thereof a cam or eccentric 60, which bears against the rearwardly extended end of the set screw 56, to actuate the shaft 37, when the shaft 59, is rotated. Slight movement of the arm 55, on the shaft 37, is afforded, so that rotation of the cam 60 against the adjusting screw serves to swing the lower end of the sleeve 58, rearwardly, thereby elevating the'finger 38, secured on said shaft, and slightly opening the needle valve admitting oil to the extension I), of the mixing chamber. ,A lever 61, is rigidly secured on the upper end of the shaft 59, to rotate the same, and a rod 62, is pivotally secured to the extremity of said lever by means of a set screw 63, and extends rearwardly through a suitable bracket (34, to permit of manual engagement to open said needle valve preparatory to starting the earburation.

Rigidly secured on the shaft 40, at the opposite side of the carbureter, is an arm (35, provided with a set screw 66, adapted to engage on a projection or lug G7, on the outer wall of the closure, as shown in Fig. 1. Said set screws 66 and 68, afford means for adjusting said arm to limit the degree of closure of the butterfly valves to the required amount to maintain a sufficient supply of the mixture to the motor to maintain the combustion at the lowest rate of speed of the motor.

A supply of air is provided for each of the inlet jets. As shown, an air inlet port is provided opening into the extension D, of the mixing chamber slightly at the rear thereof, and a. peripheral flange 0r tubular extension 69, in the wall of the casing, is provided around said port, and extends outwardly substantially flush with the side walls of the casing, as shown in Fig. 2, and, as shown, the passage therethrough tapers inwardly to conduct the air in a strong inflowing current or jet against the jet of the lIj/(llO-CfllbOfl as it comes from the needle valve, thus spraying and thoroughly vaporizing the same and carrying the same therewith iritp the mixing chamber B, between the butterfly valves 42 and 43. As shown also, a slight elevation or rib 1'" 0, is provided on the floor of the extension ID, of the mixing chamber, at the point where the same communicates in the main mixing chamber, thereby serving to maintain a thin film of the hydro-carbon fuel on the floor of said mixing chamber extension to expose a large surface to vaporization.

An air inlet port is also provided to deliver infiowing air to, and across the top of the jet nozzle 31. For this purpose, as shown, a suitable aperture is provided in the wall of the mixing chamber and threaded thereinto is .a spider 71, at the hub of which is secured a shaft or stud 72, which extends outwardly therefrom and secured on which, and bearing against the hub of the spider, is a relatively strong spiral spring 73, coiled oppositely about which and on the outer side thereof, is a longer and weaker spiral spring 74. Slidably engaged on said stud 72, is a valve closure 75, provided on its inner side with a hub 76, adapted to engage the stronger inner spring 73, and normally held from engagement therewith by the weaker spring 74, which engages against said closure.

Threaded upon the outwardly extending annular rim 77, of said spider, is a casing 78, having an outwardly flaring nozzle 79, thereon, as shown in Fig. 3, and affording an inner seat against which said closure 75, engages, as shown in Fig. 3, when the air valve is closed.

As shown, theperiphery of said casing is longitudinally grooved on the outer side, and a spring pressed detent 80 is engaged in a suitable bracket or arm 81, secured upon the wall of the mixing chamber, and engages in said longitudinal grooves or recesses to hold said casing in adjusted position. Ofcourse, when the casing is adjusted inwardly, the tension of the springs against the closure 75, is increased thereby, while outward adjustment decreases such pressure, thereby affording a larger supply of air for the mixture.

As shown, a tubular casing or hood 82, closed at its upper end, is threaded upon a central boss 83, on the cover of the float feed chamber to exclude dust and dirt, therefrom. Said boss, as shown, is also pro-. vided with a vent passage therethrough from the float feed'chamber to vent said chamber against internal pressure. Pivotally engaged in said hood, and extending through a slot in the side wall thereof, is a bent lever, one arm 84, of which extends over and into position to engage the rod 8, when the float feed chamber is filled to normal capacity. The other end 85, of said lever, extends downwardly on the outer side of said hood, and is engaged by a suitable rod to permit manual anuation, thereby holding the rod 8, with the float thereon, downwardly, until the carbureter is slightly flooded to facilitate starting the carburation.

A spring 86, is engaged on said lever and acts to hold the arm 84, upwardly out of position to engage said rod, as shown in Fig. 3.

, A regulable auxiliary air valve is provided to afford an additional and regulable supply of air to maintain the mixture at the desired richness at high speeds or with the throttle at any position between normal running position of its maximum opening.

For this purpose the upper end of the casing affording the mixing chamber is turned immediately below the flange, whereby the same is adapted to be attached to the manifold pipe to afford an outer peripheral, cylindrical bearing extending to a lower upwardly facing shoulder 87.

A plurality of ports X, open through said easing into the mixing chamber between the shoulder and the flange. (These, as shown, are four in number, though, of course, the number may vary.)

Rotatably mounted on said casing is a 7 split ring 88, which fits beneath said flange and is provided with downwardly extending plates 89,which are arranged to correspond with said ports in position and number and at their lower edge bear upon said shoulder 87, thereby supporting said split ring in place. The ring may, of course, be constructed in any suitable manner. As shown, it is constructed into equal segments, each provided with a lug 90, at each end in which engage cap screws or plates to rigidly seciife the same together. Secured on one "side of said ring 88, is a lateral extending arm or projection 91.

Journaled upon the extended end of the shaft 41, is a cam lever 92, which .extends upwardly and rearwardly and is provided therein with an obliquely directed slot Y, to receive the shaft 40 therein which protrudes therethrough.

Rigidly but adjustably secured on the extremity of said shaft beyond the cam lever is an arm or lever 93, which, as shown, is provided with a split hub to receive said shaft and is adapted to be clamped on the shaft by means of a clamping screw 9%. A .stud 95, is secured on the outer or free end of said lever and journaled thereon is a roller 96, which extends into a cam slot Y, in said cam lever, which is directed obliquely with reference to the slot Y. The lower portion of the slot Y is curved concentrically about a point in the forward extremity of the slot Y as a center, which is positioned on the shaft 40, in said slot at its lowest throttle position.

Secured on the upper end of the'cam lever is a fitting 97, having a ball shaped recess or socket therein and secured on the projection or arm 91, of the ring 88, is a corresponding connection 98, also having] a ball socket therein.

Said connections 97 and 98, are connected by means of the complementally or male and female threaded rods 99 and 100, each provided at one end with a ball shaped head adapted to engage in said connections as shown in Figs. 1, 2 and 7, said connecting rod being thus adjustable as to length to enable the ring 88, to be accurately set to close the ports controlled thereby when the carbureter is adjusted to lower throttle position.

The operation is as follows:

The set screw 66, in the arm (35, carried on the shaft a0, is adjusted to limit the closure of the butterfly valves to a position affording the necessary degree of opening to permit the continued operation of the engine at the lowest possible throttle adjustment to maintain the operation of the engine at its lowest rate. In this position the needle valve admitting to the extension in the mixing chamber may be Very nearly quite closed it the carbureter is a multiple jet carbureter, in which event the hydro-carbon is supplied from the jet 31, within the mixing chamber. When so adjusted an adequate amount of airfor the mixture is supplied through the bottom of the mixing chamber or through the unvalved port admitting into the extension l), of the iixing chamber or even through the automatic air valve in advance of the jet 31, an additional source or air supply is or course, not required. Freferably, however, the cam 4C9 is adjusted by means of its screw shaft 50 to afford a degree of opening of said needle valve to supply at least a part or the hydrocarbon for the carburation. The downward pressure upon the stem of the needle valve exerted by its spring 36. acts to hold the cam 60, in bearing against the said screw 56, thereby holding the bearing plate 54, in

engagement with said cam and the set screw- 56, of course, is adjusted to afford any desired degree of opening of said needle valve at such position. Should it be desired to increase the amount of hydro-carbon deliv ered through said needle valve into the extension D, of the mixing chamber, it may be accomplished by rotating the cam 60 by means of the lever 61. This rotates the shaft 37, inasmuch as the arm 53, being held from forward movement of its cam 49, necessitates the rearward swing of the sleeve 58, which is rigidly secured on said shaft 37, thereby opening the needlevalve temporarily.

The cam, having been properly set, the rotation of the shaft 40, by the throttle lever serves to simultaneously open the butterfly valves in the mixing chamber and also to further open'said needle valve admittin to the mixing chamber and up to and inc uding the normal running rate of the engine,

til

a suflicient amount of air for the mixture may be admitted through the bottom of the mixing chamber through the automatic valve in the frontof the mixing chamber and through the open port to the extension I). of the mixingchamber for efficient operation.

From the lowest throttle adjustment to the throttle adjustment at which the aforesaid air valves and ports become insuiiicient to maintain the proper mixture the lever 93. is moved upwardly in the curved portion of the cam slot which, as before stated, is concentric with the shaft l0. at that time, and in consequence no movement whatever of the cam lever is occasioned thereby. 93, is so adjusted on the shaft 40, howcven as to engage in the oblique and relatively straight portion of the cam slot at that position of the butterfly valves when further opening of the throttle requires more air for the mixture and in consequence such further opening of the throttle swings said arm upwardly thereby swinging the cam lever forwardly. as shown in Fig. 1, opening the valves controlled by said ring 88, to a degree proportional wit the further adjustment of the throttle. Inasmuch as the length of the rod connecting the cam lever with the ring or annular valve closure may be adjusted as desired, it is obvious that the amount or degree of opening occasioned at of the throttle or at any inte mediate position may be adjusted with the utmost nicety by varying the length of said connecting rod or properly adjusting the lever 93, on the shaft l0, or by both. as required. so that the richness of the miriture may remain practically unaltered under any and all conditions. the quantity only vary" Of course, this construction also permits of such relative adjustment of the needle valve admitting to the mixing chamber as to permit the mixture to be supplied to the mixing chamber mainly f om the jet 31 or that Within the mixing chamber when the engine is operated at a low rate and to bring the needle valve admitting to the entension D, of the inlet chamber into opera-- full openin .tion when only an additional supply of the hydro-carbon may be required above the initial starting rate. Of course, inasmuch. as more or less of the hydro-carbon is usually contained upon the floor of the extension D of the mixing chamber and within the cup 27., a very large vaporizing surface is afi'orded for the hydro-carbon which serves toprevent any loss through leakage. it is to be observed that the jets are so disposed that the air inlet to the mixing chamber is directed in part across each jet. This greatly facilitates vaporizing and mixing, and, inasmuch as the air ports of the mixing chamber are arranged on opposite sides The arm l. ll

thereof, the air drawn thereinto passes upward around the mixing chamber insuring the perfect mixture of all the hydro-carbon admitted.

If preferred the auxiliary air Valve may be constructed to swing instead of rotate, as shown in Figs. 12 to 13 inclusive, in which the lever 93, engages in a cam slot, eccentrically disposed in a swinging valve plate 101, which normally closes a port opening through the wall of the mixing chamber just below the manifold connection. Said lever arm is set to open said valve when an additional supply of air is received for high speed operation.

Of course, it is to be understood that I have described but a preferred form of my invention, although numerous details of the construction and operation may be varied to adapt the invention to carburetors of different makes than the one to which I have shown the invention applied. I therefore do not purpose limiting the patent granted on this application otherwise than necessitated by the prior art.

I claim as my invention:

1. In a carbureter a mixing chamber, a hydrocarbon supply chamber, connected butterfly valves in the mixing chamber, a

throttle lever connected therewith, a needle valve controlling the hydrocarbon flow to the mixing chamber, operative connections between the same and the throttle for actuating the same, an automatic air inlet valve opening into the mixing chamber and between the butterfly valves, and a throttle operated auxiliary air valve mounted on the wall of the mixing chamber above said valves and controlling ports therethrough and operative connections between the same and the throttle valve for openmg the same progressively as the throttle is opened.

2. In a carbureter a mixing chamber having air ports opening therethrough and extending peripherallv around adjacent the manifold connection, connected valve closures extending circumferentiallv around said mixing chamber and rotatably movable to control. the opening of said ports, butterfly valves mounted within said mixing chamber, a fuel supply valve and operative connections between said butterfly valves, said valve closures and said fuel supply valves whereby said closures are actuated to progressively increase the port openings as said butterfly valves are opened, and said fuel valve is also progressivelyopened therewith.

3. In a carbureter a mixing chamber, a plurality of ports opening therethrough and disposed peripherally therearound adjacent the manifold connection, a rotatable closure for said ports, a plurality of butterfly valves mounted within said mixing chamber, an air inlet to said mixin chamber between said butterfly valves, an automatic valve therefor, one to control the outlet therefrom and the other to control the inlet of air thereto, and operative connections between said butterfiy valves and valve closures whereby the ort openings are varied with the actuation of said butterfly valves.

4. In a carbureter the mixing chamber, a float feed chamber, a needle valve controlling the connection between the float feed chamber and mixing chamber, a normally open hydrocarbon jet communicating with the float feed chamber and delivering upwardly into themixing chamber, a cup supported below the bottom of the mixing chamber, and through the bottom of which said jet extends, upper and lower connected throttle valves mounted in the mixing chamher, the one above and the other below the top of said jet, an automatic air valve opening into the mixing chamber between said throttle valves, an auxiliary air valve opening into said mixingchamber near the manifold connection therefor on the posterior side of the throttle, adjustable connections between said auxiliary valve and the throttle mechanism, and connecting to open said auxiliary valve progressively with the opening of the throttle valves.

5. In a carbureter of the class described an annular auxiliary air valve, controlling peripheral openings into the mixing chamber closely adjacent the manifold connection, butterfly valves controlling the flow through said mixing chamber, and operative connections on the exterior of the carbureter for imparting rotational movement to said auxiliary valve with the adjustment of the butterfly valves.

6. In, a device of the class described a mixing chamber, a valve controlling the flow of hydro-carbon thereto, valves controlling the air mixed therewith, a valve to control the quantity of mixture flowing through said chamber, an annular auxiliary valve disposed around the interior of said mixing chamber to permit increase in the quantity of air in the mixture flowing past said latter valve, and operative connections between all of said valves for adjustment of all thereof.

7. In a device of the class described a mixing chamber, a valve controlling the flow of hydro-carbon thereto, valves for controlling the quantity of air mixed therewith, a throttle valve controlling the quantity of mixture flowing fromsaid chamber, an annular auxiliary air valve disposed beyond the throttle valve to admit air into the mixture through peripheral ports in said mixing chamber after the same has passed said latter valve, and operative con- 8. In a device of the class described a.

mixing chamberz. a valve controlling the flow of hydro-carbon thereto, valves for controlling the quantity of air mixed therewith, a throttle valve controlling the quantity of mixture flowingfrom said chamber, and a positively actuatable auxiliary air band valve extending circlunfercntially around said mixing chamber to admit air to the mixture after the same has passed said throttle valve. l t

9. In a device of the class described a mixing chamber having peripheral ports therein, a valve controlling the flow of hydro-carbonthereto, valves for controlling the quantity of, air mixed therewith, a

throttle ,valve controlling, the quantity of mixture flowing from said chamber, an annular auxiliary air valve extending circumferentially around said mixing chamber controlling said ports to admit air into the mixture :after the same has passed, said latter valve, operative connections positively actuating each of said valves with actuation of the hydro-carbon valve, and means operating said hydro-carbon valve independently of the other of said valves.

10. In a device. of the class described a mixing chamber, butterfly valves controlling the inlet and outlet of fluid moving therethrough, a hydro-carbon valve for admitting fuel to said mixing chamber, and an annular auxiliary air valve disposed on the exterior of said mixing chamber connected therewith to open after said hydro-carbon and butterfly valves have opened a certain amount.

11. In a device of the class described a mixing chamber, inlet and outlet valves therefor, a hydro-carbonvalve to admit fuel into said chamber, a supplementary auxiliary air valve disposed peripherally around said chamber and disposedbeyond the out- I let valve thereof, and connections between all of said valves whereby said latter circumferential valve is actuated into open position after theotherof said valves have moved a certain amount toward open position and not before.

12. In a carbureter of the class described a mixing chamber, connected inlet and outlet valves therefor, a plurality of fuel inlets to introduce the fuel into said mixing chamber, means controlling theflow through one of said fuel inlets connected for operation with said inlet and outlet valves of the mix ing chamber, and a rotatable auxiliary air inlet valve connected for actuation with said mixing chamber inlet and outlet valves adapted to introduce air into the carbureter beyond the outlet valve thereof.

13. In a device of the class described a mixing chamber, a, throttle valve controlling the flow therefrom, fuel inlets for in-.

troducing fuel into the mixing chamber, a

plurality of air inlets for saidmixing chamber, one normally open and adjacent one of said fuelinlets, an automatic air valve controlling the flow through another of said air inlets, a butterfly valve connected to said throttle valv controlling the flow through another of said air inlets, and an auxiliary air inlet for the carbureter disposed beyond said throttle valve to. introduce air into the mixture flowing from the mixing chamber.

14. In a device of the class described a mixing chamber, inlet and outlet valves therefor connected to one another fo'rsimultaneous operation, a plurality of fuel inlets at different levels for introducing fuel into the mixing chamber, an automatic valve for introducing fuel into the mixing chamber between the connected inlet and outlet valves thereof, a normally open air port introducing air into the mixing chamber between said connected inlet and outlet valves, and a rotatable valve forintroducing air into the carbureter beyond said outlet valve thereof and connected for actuation with said connected inlet and outlet valves.

15. In a carbureter of the class described a mixing chamber, an outlet valve therefor, a plurality of fuel inlets for introducing fuel into the mixing chamber, an automatic valve for admitting air into the mixing chamber, a butterfly valve forintroducing air through another inlet into the mixing chamber,a normally open air port for introducing air into the mixing chamber, and an auxiliary air valve for introducing air into the mixture flowingpast the outlet valve and connected for operation with said outletvalve. 16. In a device of the class described a mixing chamber, an outlet valve therefor, a pluralityof air inlets for said mixing chamber, an automatic valve controlling the flow through one thereof, another of said inlets normally open and of constant area, a butterfly valve controlling another of said air inlets, means introducing fuel into said mixing chamber and 0 eiatlvely connected with the outlet valve tiiereof, and an auxiliary rotatablevalve for. introducing air into the mixture fiowing past said outlet valve and operatively connected with said outlet valve and fuel inlet means. v I 17. Ina carburetor of the class described the combination with a float chamber and mixing chamber, of fuel'inlets for introducing fuel from the float chamber into mixing chamber at different levels therein, an outlet valve for said mixing chamber, a plurality of air inlets therefor, one normally open and of constant area and adjacent one of said fuel inlets. another disposed in alinement with the outlet from said mixing chamber, a valve for said latter air inlet. an automatic valve for another of said air inlets for introducing air into the mixing chamber between said alined inlets and outlets of said mixing Chamber, and a rotatable valve for intro- 10 ducing air into the carbureter beyond'the throttle valve and connected for operation with the outlet valve of said mixing chamber.

In testimony whereof I have hereunto subscribed my name in the presence of two subscribing witnesses.

CHARLES L. RAYFIELD.

Witnesses:

CHARLES W. HILLS, Jr., GEORGE R. MOORE.

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