US2223836A - Carburetor - Google Patents

Description

Dec. 3, 1940. c. R. SNYDER 2,223,836

GARBURETOR Filed July 26, 1939 2 Sheets-Sheet 2 Ell Patented Dec. 3, 1940 UNITED STATES PATENT OFFICE 13 Claims.

This inventionrelates to improvements in carburetors of the type employed for producing -'vaporized or gaseous fuel mixtures for internal combustion engines.

Certain general objects of the invention reside in the provision of a novel carburetor wherein the carburetted fuel mixture produced thereby will be of an eflicient and uniform character at all speeds of engine operation, in order to enable an engine to operate with greater smoothness, flexibility and fuel economy than are obtainable with carburetors of more conventional design; and in the provision of a carburetor characterized by the simplicity of its mechanical construction and accessibility of its internal mechanisms.

It is another object of the invention to provide a carburetor having a rotary impeller, or other equivalent means, by which liquid fuel delivered to the impeller is disseminated in a confined chamber in the form of a fine mist or spray, and through which spray, air is passed in intimate combining and vaporizing contact with the finely dispersed particles of the impeller discharge spray, so that there is produced a resulting fuel mixture of a more completely vaporized character than is obtainable with ordinary carburetors, and one which may be more economically and efficiently utilized as an explosive mixture in the cylinders of an associated engine.

The present application is a continuation in part of my prior application, Serial No. 119,477 filed January 7, 1937 (allowed April 10, 1939 and abandoned by failure to pay final fee).

For a further understanding of the invention, reference is to be had to the following description and the accompanying drawings, wherein:

Fig. 1 is a vertical sectional view taken through a carburetor constructed in accordance with the,

present invention;

Fig. 2 is a top plan view of my improved carburetor;

Fig. 3 is a detail side elevational view of the air shutter control mechanism;

Fig. 4 is a detail vertical sectional view on the plane indicated by the line IV-IV ofFig. 1;

Fig. 5 is a similar view on the plane disclosed by the line VV of Fig. 1;

Fig. 6 is a horizontal view on the line VI-VI of Fig. 1;

Fig. '7 is a horizontal sectional view taken through the rotary impeller or turbine on the line VIIVII of Fig. 1.

Referring more particularly to-the drawings, the numeral I designates the casing of my improved carburetor. In this instance, the casing comprises circular upper and lower plates 2 and 3, respectively, the said plates being spaced by a ring or annulus I, which may be of a transparent or translucent material so that the mechanism arranged within the mixing chamber 5 of the car- 6 buretor may be observed from the exterior. Other materials of course may be used in the construction of the ring or annulus without departing from the invention. 1

Formed with the upper plate 2 is an air ad- 10 mitting conduit 6, the latter being curved or bent to form an elbow 1 which arises from the plate 2 and terminates in a laterally directed and upwardly projecting extension 8.

In this extension, there is disposed a pair of 15 air-admitting shutters, as indicated at 9 and Ill. Normally, these shutters are disposed in the horizontal positions indicated in Fig. 1, obstructing air flow into the conduit 6, the adjoining edges of said shutters being separated by a thin station- 20 ary divider wall H, which projects a short distance downwardly into the extension 8.

The shutter 9, substantially rectangular in configuration, is connected along one edge with a rock shaft l2, journaled for rotation in the walls of the extension 8. One end of the shaft l2 pro- Jects exteriorly of the extension 8 and has fixed thereto a crank arm l3, by which the rock shaft is partiallyrotated. The outer end of the crank arm I3 is pivotally connected as at ll with one end of a link l5. The other end of this link, as shown in Fig. 3, is slotted as at l6 for the recep tion of a pin l1 projecting from the outer end of a crank arm l8 which is fixed upon the outer end of a second rock shaft l9, employed in effecting the support of the air shutter Ill.

The crank arm I8 is considerably shorter than the crank arm l3 so that when a partial vacuum exists in the chamber 5, the pressure of atmospheric air on the shutters 9 and III will cause the latter to oscillate about the axes of the rock shafts l2 and [9. The movement of the air shutter I0, however, is greater or faster than that of the shutter 9. These shutters operate as individual valves, as the divider ll separates the same and provides two parallel paths of air travel.

These air shutters or valves are linked together by the link l5 and the crank arms i3 and [8, with the leverage so distributed that the shutter 50 ill will travel at a speed much faster than the shutter 93. Further, provision is made in the link age, by use of the slot 16, so that when the valve l0 travels its full degrees of movement and comes to rest in a fully opened position, the link- 55 age fails to act as a stop in arresting the travel of the second shutter 9, which will have traveled but a part of its full radius of travel due to the 'air pressure on it and also to .the leverage pull .move toward its open position. Due to the short length of the crank arm l6, the air pressure required to swing the shutter l0 into operation or open position is much less than that required on the other shutter, with the result that the shutter II will complete its full travel and, as the air presure continues to increase, the second valve will pick up from that point and open until the maximum opening of both shutters is reached. The shutter 9, as will be hereinafter explained, is connected to the gasoline flow controlling needle valve to govern its operation, while the shutter I ll only indirectly operates in controlling the needle valve through the linkage joining the shutters 9 and I6. By the construction disclosed, the shutters are linked together in such manner that one will open at a time to its fully opened position, the operation of the other being related, pending a greater demand for air inflow into the carburetor.

In Fig. 3, there has been disclosed a pivoted arm 26. This arm is joined with a wire 2| or other flexible cable leading to an operators position. By applyinga pulling force to the wire 2!, the foot 22 of the arm 20 will engage with the crank arm l3, thus causing the oscillation of the rock shaft I 2 and the manual actuation of the fuel control valve of the carburetor. While a manual choke control has been disclosed, it will be understood that the conventional thermostat control may be employed with equal facility.

In order. to coordinate the inflow of liquid fuel into the carburetor with the inflow of air, the rock shaft I2 is provided with an upstanding ear 23, to the upper portion of which is connected one end of a link 24. The other end of this link is connected with an L-shaped lever 25. Thus lever is provided, as shown in Fig. 4, with fulcrum trunnions 26, the ends of the trunnions being journaled as at 21 in a ring 28. This ring engages with a flexible diaphragm 29, which closes or seals the open side 30 of a drum-shaped housing 3!. The opposite side of the housing 3| is closed by a removable plate 32, and a fuel pipe line 33 having a threaded fitting 34 enters the housing axially through the plate 32. The pipe line 33, of course, leads from any suitable source of liquid fuel supply, but preferably from a source of fluid under pressure as a fuel pump although the device will operate when fed from an elevated tank. The ring 28 is securely united with the diaphragm 25 and-the walls of the housing 3| by screws 35, producing a fluid tight connection or seal.

The horizontal arm of the lever 25 extends axially into the interior of the. housing 3|, passing through the central portion of the diaphragm 29 and to which the lever 25 is securely clamped by the use of a 'nut as. Due tel its flexibility,

the diaphragm 29 permits of limited oscillation of the lever 25 and at the same time seals the interior of the housing 3| against liquid loss. The provision of the diaphragm 25 thus obviates the necessity for employing the usual objectionable stufling boxes or packing glands. W

The upper end of the lever 25 is connected with one end of a coil spring 31. The other end of the coil spring is Joined with an adiustable bolt 38, mounted with the plate 32 of the housing 3|. The spring 31 thus serves in the dual capacity of yieldably maintaining the lever 25 and the shutters 9 and 10 in their normal positions, and regulating the proportion of fuel and air introduced into the mixing chamber.

The inner end of the lever 25 is slotted as at 40 for the reception of a pin 41 carried by the upper end of the stem 42 of a vertically guided needle valve 43. The valve and its stem are arranged in ,the vertical passage 44 provided in a tubular member 45. This member is positioned snugly within a tubular boss 46 integrally de pending from the elbow I of the air conduit 6. Toward its lower end, the tubular member is externally threaded, as at 41, for the reception of a nut 48 which, when tightened, holds a frustoconical air deflecting plate 49 in its stationary operative position. In this connection, and by reference to Fig. 1, it will be noted that the outer peripheral portion of the plate 49 is slightly spaced from the lower annular edge of the elbow l, producing a restricted annular space 50 for the flow of air leaving the open lower end of said elbow.

The extreme lower end of the tubular member 45 is internally threaded for the reception of a seating guide 5|. This guide extends upwardly into the internal passage of the tubular member and is formed at its upper end with a drilled head 52 for the slidable reception of the stem of the needle valve. The head 52 also acts as an abutment for one end of a coil spring 53. This spring surrounds the valve stem below the head 52, and the lower end of the spring presses against a collar 54 which is fixed on the valve stem immediately above the conical. tapered extremity 55 of said needle valve. Thus the tendency of the spring 53 is to maintain the tapered end 55 of the needle valve in contact with the correspondingly tapered and small seating orifice 56, formed axially in the lower end of the guide 5l. This guide is slotted along its sides and through the head 52 so that liquid fuel may readily pass through and around the same toward the orifice 56.

Also, the lower end of the guide includes an annular flange 51 which acts as a seat for the inner race 58 of a ball thrust bearing. The outer race 59 of this hearing is firmly forced into a hub 60 depending from the rotary impeller 6|. This impeller, as shown in Figs. 1 and 7, includes radial vanes 62 which communicate at their inner ends with the annular space 50, so that air drawn into the carburetor through the conduit 6 will strike the vanes 'while moving at high velocity, causing high speed rotation of the turbine or impeller in order to eflect the centrifugal dissemination oi the liquid fuel discharged in regulated quantities through the orifice 56. Connected with a flange 63, forming a part of the hub 60, is a disk-shaped disseminator 64, the latter being united with the flange 63 by means of the threaded pins 65.

It will be seen that as air is drawn into the carburetor through'the shutters 9 and I 0, it is caused to travel at high velocity through the space 50, when it contacts with the vanes 62, producing high speed rotation of the air turbine or impeller 6|. Corresponding high speed rotation is thus imparted to the disseminator 64 as it is directly connected with the under part of the impeller or turbine. Thus, liquid fuel, discharged from the orifice 56, is first deposited upon the central portion of the disk-shaped disseminator, where it is subject to centrifugal forces, caused by the rapid notation of the disseminator. Asaresult,thefuelisdischarged 5 from all portions of the outer peripheral edge of the disseminatorintheform ofailnemistof' annular conflguraflon. Air, discharged from the outer portions of the turbine or impeller, is drawn downwardly through this mist and V intimately combines with the liquid fuel particles to produce an efllcient vaporous or gaseous mixturebytheturbulencethussetup. Ittheair space 5| becomes too small to provide for the air inflow into the carburetor, provision is made to cause the air to partially lay-pm the turbine or impeller.

Thus, as shown in Figs. 1 and 6, the lower end of the elbow 1, above the impeller, is formed with arcuate ports 66. These ports are normally closed by arcuate shutters II, which are hingedly moimted as at I. The shutters 61 are kept normally closed by means of springs 88. These shutterswillopeninresponsetohighairpressures, permitting a portion of the air entering the carburetor to by-pass the impeller or turbine ii. The operation of the shutters i'l, however, is such as not to in any way interfere with the desired flow of air through the impeller to cause the high speed rotation at any stage of carburetting operation. The disseminator disk 4 is somewhat smaller in diameter than the impeller ll. These proportions are provided in order that there will be no interference with the discharge of liquid fuel in spray form from the peripheral edge of the flat surfaceddiskflasaresultofairflow through the carburetor.

Also, for this reason, a stationary deflector plate ll is arranged below the disk 64, so that the flow of air through the carburetor will be in the paths indicated by the arrows in Fig. 1. The lower plate of the disk SI includes a depending tubular extension II in which is providedthe conventional butterfly valve I2, the latter being carried by a transverse shaft journaled in theextensions II. The lower portion of the extension 1| terminates in a flange by which the carburetor may be attached to an engine intake manifold, not shown. Standard controls, such as a crank arm and rod extending to the accelerator control of the vehicle, may be employed for actuating the butterfly valve I2.

Entering the extension Ii below the butterfly valve I2 is a threaded fitting 13 of a small copper pipe line 14. This pipe line passes, as

shown in Figs. 2 and 4 to a cylinder 15, mounted on the ring 28 of the housing 3|. "Within the cylinder 15 there is provided a sliding piston 16. This piston is connected at one end with a swinging arm 11 which is pivotally mounted as at II on the ring 28. The arm 11 carries an adjustable stop in the form of a screw of the type indicated at 19. A small coil spring 80 is connected at one end with the screws 19 and at its other end with the ring 28. A stop pin ll may be used for limiting the swinging movement of the arm 11 in an outward direction so that the lower end of the screw 19 is removed from engagement with the horizontal portion of the L-shaped lever 25.

By the use of this construction, when the engine associated with the carburetor is started, a

partial vacuum is set up in the extension I i which is transmitted through the pipe line I4 to the cylinder l5, drawing the piston 16 inwardly, and

moving the arm ll against the resistance of the spring 80, so that the lower end of the screw 19 will be positioned immediately over the horizontal branch of the lever 25, thus holding the lever 25 so that the needle valve will be prevented from completely seating in the orifice 56. This provides for the idling of the engine without undue stoppage. However, when the engine is stopped, the vacuum in the cylinder 15 is released, so that the piston II and the arm ll will respond to the influence of the spring ll, moving the set screw I! to the position disclosed in Fig. 4, thus providing for complete setting of the needle valve in the orifice 5i.

In view of the foregoing, it is seen that the present invention provides a carburetor wherein first of all a very intimate contactis eifected between the liquid fuel and the oxygen of the air, in order to produce a highly eiilcient carburetted mixture which will burn cleanly and completely inthe cylinders of an associated engine to produce smooth even power. The carburetor is particularly sensitive in its response to changing gaseous condition with virtually no interference or intermingling of one with the other. This transmission of power through the diaphragm is also positive with minimum loss or resistance offered by the seal, due to the diiferentiatlon of pressures of the gaseous or liquid fluids on either side of the seal. This minimum resistance is secured by virtue of the pressure being unable to detrimentally aifect the linked arms at any point except the fulcrum of the same, where, of course. the pressure is minimized to such an extent as to be scarcely appreciable.

The construction of the carburetor is such as to maintain automatically the desired proportions of the liquid fuel and air in the carburetted mixture at all stages of carburetion. Such proportioning of the fuel mixture is obtained by the operation of the air admitting shutters 9 and Ill and the associated linkage employed which is responsive to the operation of the shutters to govern the degree of opening of the needle valve and consequently the volume or quantity of liquid fuel delivered to the disseminating disk. The spring actuated by-pass shutters 61 are also important in maintaining required volumetric flow of air through the mixing chamber of the carburetor, the said by-pass shutters preventing throttling of the air in the region of the turbine entrance.

A relief valve has been disclosed at 82 in the upper plate 2 of the casing I in order to relieve the interiorof the carburetor of excessive pressures, such as those which may be produced by engine back-firing.

While I have described the preferred form of the present invention, nevertheless it will be understood that the same is subject to considerable modification without departing from the intent and spirit of the invention as set forth in the followingclaims.

I claim:

1. In a. carburetor of the type having a casing formed to include a. mixing chamber provided with air inlet and carburetted fuel outlet passages and fuel disseminating means positioned in the mixing chamber, a fuel conductor tube ex tending into said mixing chamber and terminating adjacent said disseminating means, valve means in said tube for controlling the flow of connectin said shutter and the outer end ofsaid lever to impart movement to the lever to actuate said valve upon movement of said shutter in response to the passage of air through the air inlet passage.

2. In a'carburetor of the type having a casing formed to include a mixing chamber provided with air inlet and carburetted fuel outlet passages and fuel disseminating means positioned in the mixing chamber, a fuel conductor tube extending into said mixing chamber and terminating adjacent said disseminating means, valve means'in said tube for controlling the flow of fuel from said conductor to said means, a drum-shaped fuel receiver communicating with said fuel conductor, said receiver having an open side, a flexible diaphragm closing the open side of said receiver, a valve actuating lever extending through said diaphragm and connected at its inner end with said valve means, said lever being pivotally supported by said receiver adjacent said diaphragm, the latter being 35 clamped to said lever and serving to prevent the I escape of fuel therearound, a transversely extending partition wall positioned in said air inlet passage to divide it into a plurality of branches, a normally closed shutter mounted 40 for pivotal movement in each branch and operated by thepassage of air therethrough, connecting means between said shutters to control the degree of relative movement therebetween, and linkage means extending between one of 45 said shutters and the outer end of said valve actuating lever to transmit movement to said valve in response to movement of said shutter.

3. In a carburetor of the typehaving a casing formed to include a mixing chamber provided with air inlet and carburetted fuel outlet passages and fuel disseminating means positioned in the mixing chamber, a fuel conductor tube extending into said mixing chamber and terminating adjacent said disseminating means, valvemeans in said tube for controlling the flow of fuel from said conductor to said disseminating means, a drum-shaped fuel receiver communicating with said fuel conductor, said re-" ceiver having an open side, a flexiblediaphragm closing the open side of said receiver, a valve actuating lever extending through said diaphragm and connected at its inner end with said valve means, said lever being pivotally sup- 65 ported by said receiver adjacent said diaphragm,

the latter being clamped to said lever and serving to prevent the-escape of fuel therearound,

a normally closed pivoted shutter positioned in said air inlet passage, linkage means connecting 70 said shutter and the outer end of said lever to impart movement to the lever to actuate said valve upon movement of said shutter in response to the passage .of air through the air inlet passage, and control means for said lyalve 75 actuating lever including an arm mounted for swinging movement on said receiver, spring means normally tending to hold said arm in an inoperative position, and vacuum operated meansfor swinging said arm to a position to hold said valve in a partially open position dur-- ing the operation of an engine to which the carported within said mixing chamber by said fuel conductor, a deflector wall extending across the inner end of said air inlet conduit in the vicinity of said impeller to maintain a substantially uniform flow of air to said impeller, a spring pressed by-pass valve carried by said air inlet conduit in advance of, said deflector and within said mixing chamber, a disseminating disk secured for rotation with said impeller, and valve mechanism for controlling the flow of fuel through said conductor to said disk.

5. In a carburetor of the type having a casing provided with a mixing chamber, air inlet and carburetted fuel outlet conduits, fuel vaporizing means supported in the mixing chamber, a fuel conduit extending into the mixing chamber and terminating adjacent said vaporizing means, a hollow liquid fuel receiver communicating with said conduit, said receiver having a circular opening in one side, valve means extending through said conduit and operating to control the flow of fluid therethrough, an operating lever for said valve extending into said receiver through the opening, pivot means for said lever extending diametrically across the opening in said fuel receiver, a diaphragm secured over said opening and to said lever in fluidtight relationship, the connection between said diaphragm and lever being adjacent said pivot means, the inner end of said-lever being operatively connected with said valve means, spring means connected with the outer end of said lever and normally tending to move said' valve to a closed position, a shutter pivotally supported in the air inlet conduit for movement in response to the passage of air therethrough, and motion transmitting means between said shutter and said lever for moving the latter in opposition to said spring.

6. In a carburetor of the type having a casing provided with a mixing chamber, air inlet and carburetted fuel outlet conduits, fuel vaporizing means supported in the mixing chamher and a fuel conduit extending to the mixing chamber and terminating adjacent said vaporizing means, a hollow liquid fuel receiver communicating with said conduit, said receiver having a circular opening in one side, valve means extending through said-conduit and operating to control the flow of fluid therethrough,

an operating lever for said valve extending into said receiver, through the opening, pivot means for said lever extending diametrically across the opening in said fuel receiver, a diaphragm secured over said opening and-to said lever in fluid-tight relationship, the connection between said diaphragm and lever being adjacent said pivot means, the inner end of said lever being posed in the air inlet conduit and dividing it into a pair of branches, a transversely extending shaft journaled in each branch adjacent the wall opposite said partition wall, a shutter secured to each shaft and movable therewith in re sponse to the flow of air into said conduit, a crank arm secured to each shaft exteriorly of said conduit, said crank arms being unequal in length, link means connecting said crank arms to provide'for simultaneous movement of the shutters, a second crank secured to the shaft having the longer crank arm, and a link extending between said second crank and said valve operating lever to impart movement to said valve in proportion to the movement of the shutter provided with the longer crank arm.

7. In a carburetor of the type having a casingwith air inlet and carburetted fuel outlet passages and fuel vaporizing means positioned in the mixing chamber, a fuel conductor tube extending into said mixing chamber and terminating adjacent said vaporizing means, valve means in said tube for controlling the flow of fuel from said conductor to said vaporizing means, partition means positioned in the air inlet passage to divide it into a plurality of inlet branches, a normally closed pivoted shutter positioned in each branch, and operated by the passage of air therethrough, means for connecting said shutters to control the degree of relative opening movement thereof, motion transmitting mechanism connecting one of said shutters with said valve means to impart movement to the latter when the former moves in response to the passage of air through the air inlet pas-' sage, and means for operating said fuel control valve independently of the flow of air through the air inlet passage.

8. In a carburetor, a casing provided with a mixing chamber and inlet and outlet passages communicating therewith, a tubular fuel conducting member projecting through said inlet passage and into said chamber, a plug provided with a reduced bore positioned in the inner end of said tube, a needle valve movably positioned in said tube and cooperating with said plug to control fluid flow through said tube, a lever pivotally supported adjacent the outer end of said tube, an air actuated member positioned in said inlet passage, connections between said member, said needle valve and the ends of said pivoted lever to actuate said valve in response to the movement of air through said inlet passage, an

impeller having a plurality of radiating passages disposed in a plane at right angles to the axis of said chamber rotatably secured to the inner end of said tubular member, the inner ends of the radiating passages communicating with the inlet to said chamber, and a disk positioned adjacent the inner end of said tubular member and secured for rotation with said impeller.

9. A carburetor for internal combustion engines comprising a casing having a mixing chamber, an air admitting conduit of smaller diameter than said chamber entering one side of the latter, a carburetted fuel discharge conduit of smaller diameter than said chamber communicating with the opposite side of the latter, a fuel admitting pipe carried by said casing and terminating axially within said chamber, valve means responsive to the passage of air through said air admitting conduit for controlling the passage of fuel through said pipe, a rotatable fuel disseminating disk having a substantially flat surface on which liquid fuel discharged from said pipe is deposited, an air driven rotor of zontally arranged spaced plates having turbine blades disposed between the same, one of said plates being in open registration with the discharge end of the air admitting conduit, whereby air drawn through said last-named conduit into said chamber engages the blades of the rotor to revolve the latter about the axis of said pipe connection,-the rotation of said rotor and disk causing liquid fuel deposited on the disk to be discharged in finely divided spray form in a substantially horizontal plane from the entire periphery of said disk for intimate contact with air passing through the mixing chamber in a direction generally perpendicular to the fuel spray, and a stationary battle of greater diameter than said disk arranged on the opposite side of the latter as regards said rotor, said baflle and said rotor serving to provide a protected area about the peripheral portion of saiddisk to prevent air currents passing through said mixing chamber from interfering with the radial discharge of the liquid fuel from said disk.

10. In a carburetor, a casing having an enlarged mixing chamber, an air inlet conduit communicating with said chamber, 'a pivoted damper valve in said air inlet conduit and responsive to the passage of air therethrough; a carburetted fuel conductor leading from said mixing chamber, a smooth flat disk mounted for rotary movement in said chamber, means operated by the passage of air through said chamber to rotate said disk, a fuel feed line entering said chamber, a nozzle provided at the outlet of said fuel line, said nozzle being in registration with' the center of rotation of said disk, and a valve for controlling the flow of fuel through said nozzle, said valve being connected and operated in unison with said damper valve.

11. In a carburetor of the type having a mix ing chamber and air inlet and carburetted fuel outlet passages communicating therewith, fuel vaporizing means positioned in said mixing chamber comprising an impeller of the centrifugal type rotatably supported in said chamber, said impeller having spaced disks and curved blades positioned therebetween, one of said disks having a central opening in registration with the air inlet passage of said mixing chamber, means disposed in said air inlet passage adjacent the impeller for restricting the flow of air to said impeller, means provided with said air inlet passage in advance of said air restricting means for causing a portion of the air to enter said mixing chamber without passing through said impeller, a fuel vaporising disk supported for rotation with said impeller, and means for introducing liquid fuel in regulated quantities to said disk.

12. In a carburetor of the type having a mixing chamber, a fuel conductor having an opening in one side extending into said chamber and receiving liquid'fuel under superatmospheric pressure, means for controlling the flow of fuel from said conductor into said chamber comprising a normally closed valve positioned in said conductor, a lever extending through the opening in the side of said conductor and connecting with said valve member, flexible means closing the opening in the side of said conductor, said flexible means having a fluid-tight connection with said lever and conductor, and means for imparting motionv to said lever to effect movement of said valve.

13. In a carburetor of the type having a mix-- side of said conductor and connecting with said valve member, flexible means closing the opening in the side of said conductor, said flexible means having a fluid-tight connection with said lever and conductor, means for imparting motion to said lever to actuate said valve, and means responsive to negative pressures in said carburetted fuel outlet beyond said throttle valve to resist movement of said lever to retain said valve in a position providing for limited fuel flow into said 6 -mixir chamber.

CHARLES R. SNYDER.

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