US1125338A - Carbureter. - Google Patents

Description

CARBURETE APPLIGATIGN FILED $155.24, 1911.

Patented Jan. 19, 11935.

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OARBURBTER.

APPLICATION FILED M324, 1911 Patented Jan. 19 1915.

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L M. KEIZBR.

GARBUR-ETER.

APPLIUATION FILED 31124. 1911.

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-LEWIS M. KEIZER, OF BALTIMORE, MARYLAND.

CAB'BURETER.

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Specification of Letters Eatent.

Patented J an. is, 1915..

Application filed February 2%, 1911. fierial No. 610,542.

To all whom it may concern:

is it known that 1, Lewis M. listens, a citizen of the United States of America, residing at the city of Baltimore, State of Maryland, have invented :ertain new and useful Improvements in (Jarbureters for internal-Combustion Engines, of which the following is a specification.

[his invention relates to carbureters for internal combustion engines, and particularly to the type of carburetor which consists of an air passage in which liquid fuel is presented to an air current.

The carburetor of my invention consists of an air passage, a fuel delivery therein, a fuel valve, a valve for controlling the air passage, operating means for the two valves connecting them and moving them together, and independent means for adjusting the operating means whereby the motion of one valve relatively to the other may be varied. Such variation is preferably accomplished without changing the lead of the fuel valve.

An important feature of my invention consists in an adjustment of the fuel valve relatively to the operating means to determine its lead.

In the carburetor herein shown and de scribed, and in connection with which my invention has been reduced to practice, the fuel valve is controlled by means of a cam, and the throw of this cam may be adjusted to vary the movement of the fuel valve relatively to that of the throttle.

ln the preferred form of my invention the cam is pivoted to swing, the pivot being transverse to the throw of the fuel valve.

The latter is provided with a follower which coiiperates with the cam to open and close the fuel valve as the throttle or air valve is opened and closed, the cam follower being so placed that at low throttle when the fuel valve is in its initial position, the follower is over the cam ivot. lhe cam face is preferably concentric with the pivot at this point so that adjustment of the cam does not vary the lead of the fuel valve. \Vhcu the carburcter is used on motor cars, it often happens as in climbing hills, etc., that while speed is reduced increased pressure in the cylinder, and hence a richer mixture is desired. But under these circumstances, if the air valve and fuel valve are opened correspondingly, the speed of the .ened.

' tially constant.

7 that flowing through the secondary air pas-- air is reduced and the mixture is wea To provide for these conditions, I. supply means for temporarily raising the cam to give an increased opening of the fuel valve.

In the construction of my carbureter I have found it desirable to divide the entering air into two currents of which one only comes in contact with the fuel nozzle and acts as a vehicle for the hydrocarbon. The two currents are later combined and mixed before entering the engine cylindcr. For convenience, these two currents may be referred to as primary and secondary air, respectively. At low throttle the secondary air is preferably cut off or largely reduced. By thus dividing the air pas sage and placing the fuel nozzle or delivery in one of the two air passages, and cutting off the flow to the other passage at low throttle, I am enabled to secure a sufficient flow in the vicinity of the nozzle at low throttle to maintain the mixture substan- At high speed or open throttle the increased current by the nozzle is sufficient to take up enough hydrocarbon to still maintain the mixture constant when the air thus carbureted is combined with sage. in the carburetor which I have shown and described, the throttle valve and the valve controlling the secondary air passage are formed integral. However, the air and throttle valve may be differently arranged within the scope of my invention, and the combined current may be difierently controlled.

A carburetor embodying various features of my invention in its preferred form is shown in the accompanying drawingsz Figure 1 is a vertical axial cross-section through the carbureter taken on the line 1,1 of Fig. 2. Fig-f2 is a plan. Fig. 3 is a vertical axial cross-section through the valve chamber and air passages taken on the line 3, 3 of Fig. 4. Fig. 'l is a fragmentary horizontal section on the line 4-, 4 of Fig. 3. Fig. 5 is a fragmentary elevation of the carburetor looking from the di" rection of the air inlet. Fig. 6 is a top plan view of the float valve; Fig. 7 is an elevation of the carbureter.

The carbureter shown in the drawings consists of an air passage 1 in which is a ering into the chamber 3, a secondary air inlet 6 to the mixing chan'iber and a delivery T. The intake end of the air passage 1 is preferably circular, as shown, and though divided into two passages l and (3, is

adapted to be served by a single pipe and a' single current of air which is divided at the mouths of the passages l and (5. \Vithin the mixing chamber 3, the walls of which as Shown are cylindrical, is a valve member 8 also cylindrical in form and fitting the cylindrical walls 9 of the chamber. The valve 8 has inlet and outlet openings 10 and 11 registering with the secondary air inlet and the delivery, respectively. The delivery valve opening 11 is formed with a lead notch 12,- and the openings 10 and ll are so placed that when the fuel opening l1 registers with the delivery 7, the valve opening 10 registers with the secondary inlet (3- so that the air passage 1' is tree in all its branches and the maximum current of air is flowing through the carburetor. \Vhen the valve 8 is rotated so that the opening 11 is moved out of registration with the delivery 7, the lead notch 12 is opened by being brought over the delivery and the secondary inlet 6 is closed, the opening 10 being moved out of registration. To limit the oscillation of the valve as described, the coverlil of the chamber 3 is provided with stops 14, and the cylinder or barrel-valve 8 is provided with cooperating stops 15. The hood 5 is preferably carried by the barrel 'valve 8 integral with its bottom wall 16 or attached thereto, so that the hood may be removed with the barrel to permit inspection of the nozzle when setting the level of the liquid. The hood has an outlet opening 17 disposed toward the de livery valve opening 11. Itv will be noted that the free area of the hood in the hori zontal plane ofthe nozzle opening is sub stantially equal to the area of the primary air inlet 4, and that the combined areas of the inlets 4 and 6 are substantially equal to the a ten of the delivery 7. In this way the speed of the air flowingthrough the carbureter is maintained as nearly uniform at the different points of itspath as possible, and loss of speed and power from eddying and. unnecessary friction are in a large measure avoided. he'valve 8 is provided with a neck 18 axially placed and extending upward through the cover 13. Secured to the neck by means of a split collar 19 is a horizontal hand lever 20. Pivotally mounted on the lever 20 to swing in a radial plane of the axis of the barrel-valve 8 is the fuel valve lever 21. Threaded in the nut 22 which is mounted on trunnions 23 in the fuel valve lever 21 is the fuel valve 24. This is shown in the form of a needle valve which passes downward through avcentral verticalopening 25 in the neck 18 of the barrehvalve and engages a seat .26 in the tip of the non-- Zle The upper end of the stem 28 of the valve 2% has a knurled head 25) for manual adjustment, and a loch-nut is provided for maintaining the valve in adjustment. It will be apparent that when the fuel valve lever 21 is supported by any suitable means as hereinafter described, the fuel valve may be adjusted up and down by turning it in the trunnion nut 22.

Mounted on the cover 13 is a fuel valve actuating device shown in the form of a cam 31. This is pivotally mounted at 32 to swing up and down. The. cam 31 is adjusted about its pivot 32 by means of a screw 33 threaded in a lug 3 carried by the cam and bearing against a suitable abutment 35 on the cover 13. A second arm 36 ot' the lever 20 carries near its extremity uprights 3?, one on each side of the fuel valve lever ll. Supported on the upper extremity of these uprights is a nut 38 in which is threaded a hollow screwcap 39 within which is a COIlIPI't'SrllOll spring 40 hearing downward against the top of the fuel valve lever 21' At the extremity ol the lever 21 is a follower -11 engaging the cam 31 and maintained in contact therewith by the action of the spring -10.

It will be apparent that as the barrelvalve is oscillated by manual operation of the lever 20 or otherwise, the lollowcr 41 will be moved over the cam 31, and the fuel valve 24- opened and closed, and preferably the parts are so arranged relatively to each other that at low throttle the follower ll bears on the surface ol the cam adjacent the pivot 32 and prel'erably the cam surface at this point isconstructcd in the form of an arc concentric with the pivot. lherefore the fuel valve opening or lead atlow throt tie is constant except for the adjustment described, relatively to the lever 21 by means of the nut 22. As the valve 8 is rotated and the throttle and secondary air inlet openings increased toward maximum, the fuel valve isopened by the action oi the cam, and fuel in proportion to the air is supplied.

Under certain circumstances which occur comparatively infrequently, as changes of season, etc., requiring variation in the richness of the mixture, it is found desirable to adjust the ratio of the openings of the fuel and throttle or air inlet valve. 'lo accom' plish this I turn the cam about its pivot 32 by means of the screw 33 or otherwise vary the throw of the cam. 'In this connection it is important to note that under all adjustments of the cam, the initial opening of the fuel valve is constant as rotation of the cam about its pivot 32 does not affect the position of the cam follower 4-1,

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messes In hill climbing it frequently becomes necessary to temporarily increase the opening of the fuel valve beyond that given by the cam 31. This is to develop greater power at somewhat reduced speed, and it may be accomplished invarious ways. I have provided an oscillating wedge or cam 90 which serves to swing the valve cam about -its pivot and temporarily change the relative motions of the valves as the lever 20 is operated. The cam 90 is on a radial arm 91 pivoted on the hub 19 of the lever -2O. The wedge is controlled by a lever 92 which may be connected by suitable means not shovvn to the dash board of the car. The Wedge or cam 90 is normally out of engagement and is onlyused when a particularly heavy mixture is desired temporarily.

Previous to adjusting the variousv valvecontrolling means, I first set the level of the fuel at the tip of the nozzle 2. To do this I remove the cover 13 and the barrel-valve with the hood 5 so that the tip of the nozzle is exposed. I then adjust the fioat valve as hereinafter described. When this is done, I loosen the lock-nut 30 and turn the needle valve down against the seat 26. Turning the needle valve stem slightly further, the cam follower is raised pcrceptibly, showing that the valve has reached a hearing. I then rotate the valve stem backward until the follower returns to the cam surface, note the position of the parts, and rotate the valve stem backward about half a turn. Near this position the lock-nut is set after testing for efficiency. It should be understood that the barrel-valve is during this adjustment in the position of low throttle. The adjustment of the-needle valve when once accomplished, is practically permanent. The next adjust ment is that of the fuel valve cam. To get the best results this should receive attention several times a year. To adjust thetuel valve cam 31, the engine is started and run under maximum, minimum and intermediate loads, the cam being moved until the most ellicient running position is found.

To control the level of the liquid, 1 provide a float valve shown in sectional elevation in Fig. 1. a fuel chamber 50 in which is a float 51. In the fuel supply past-age 5Q-is a float valve 54 pressed against its so t by means or a com 'n-ession spring The latter is supported by means of a screw-plug 56 which is Centrallyapertured at :37 to receive the valve spindle the aperture 57 being closed by a screw 52). The spindle 58 extends above the valve protruding from the plug 60011 which the valve seat is formed. The float 51 is pivotally connected at 61 to a lever 62 fulcrumed at 33. The lever 62 ,carries a bearing point or pin 64 in line with the valve spindle to engage the tip 5 of the same. The pin is threaded in the leyer and is slotted at 66 In the carburetor body is so that it may be rotated and moved back and forth in the lever by means of the thread, and a lock-nut 67 holds the pin in adjusted position. ln the top wall of the carbureter overthe pin 0- is an aperture (39 threaded to receive a plug 70 which is bored axially to receive a pin 71 known in the art as a. primer. The pin has a head 72 and an abutment 73 to prevent its escape from the plug, and its length is considerably in excess of that of the plug. A spiral compression spring 74 encircling the pin between its head and the plug, maintains it normally in raised position with the lower abutment against the bottom of the plug. The operation of the primer is apparent. In starting,

pressure on the head 72 depresses the lever 62, moving the bearing point (34: against the top of the valve spindle, and opens the iloat valve to give an initial excess supply of fuel.

it will be noted that the float valve St is pressed against its seat by the spring 55,

maintaining the fuel passage normally closed. When the fuel in the chamber 50 stands at the desired level, 2'. a. so as to bring the liquid up. to the lips of the nozzle 2, the lever 62 is supported with the bearing pin 6-1 just out of contact with the tip 65 of the spindle 58 of the valve 54. When the level of the. liquid falls in the slightest degree, the float will move down-Ward correspondingly, and the valve 5l will be immc diately opened by contact of pin (ll with the tip (35, to give the requisite supply or fuel. In this connection it will be noted that the tension of the spring need be only sullicicnt to lift the valve into position on its seat so that vibration of the float, due to various causes, does not force the valve against its seat, and the bearing surfaces of the valve and seat are not injured in this way. It will also be a parent that to adjust the level of the liquid it is not necessary to change the tension of the spring, such adjustment being obtained by removing the cover to the float chamber and changing the contour of the lever 62, or the equivalent, changing the relative positions or" the points (ll, 63 and (34. Another important feature of this device is found in the relative positions of the primary and secondary air passages, or more particularly, their inlet ends. The inlets are located immediately adjacent each other and may be supplied by a single current of air which may be introduced by a single. pipe communicating with both inlets or may be otherwise directed. Thus at open throttle when the secondary air is at maximum, the secondary current serves as a carrier for the primary air, thereby increasing the primary air supply at open throttle, with a beneficial result in the increased quantity of hydrocarbon'introduced into the mixture at this time.

tain preferred embodiments of my inventioz'r in order that its operation may be clearly understood. However, the specific terms herein aroused in their ClBSOlljJtlVHXfltllGl than in their limiting sense, and the scope of, the invention is defined in the claims:

1. In a constant level aspirating carburefer, a valve chamber, a barrel valve therein, a fuel nozzle, the barrel valve having a hood inclosing the fuel nozzle, means for supplying fuel to the nozzle and adjusting the level of the fuel, the barrel valve being conveniently removable to expose the nozzle during adjustmcm: of the fuel level.

In a constant level aspirating carburcter, a valve clnunber, a barrel valve therein having ports and a constant air passage, :1 fuel nozzle inthe constant air passage, the barrel valve-having a hood inclosing the fuel nozzle, means for supplying fuel to the nozzle and adjusting the level of the fuel, the barrel valve being conveniently removable to expose the nozzle during adjustment of the fuel level.

3. In a constant level aspirating earbu reter, a valve chamber having a port and a constantair passage, rotating valve, :1 fuel nozzle in the air passage, the rotating valve having a hood inclosing the fuel nozzle, means for supplying fuel to the nozzle and adj usting'thc level thereof, the valve chamber having an opening for the removal of the barrel valve, and a removable cover' therefor so that the barrel valve may be conveniently removed to expose the fuel nozzle during the adjustment of the level of the fuel.

4-. In a constant level aspirating carburetor, a valve chamber-,3 rotary valve therein having a port and a constant air opening, a hood surrounding the opening, a fuel nozzle Within the hood, means for supply ing liquid fuel to the nozzle and adjusting the level thereof, the hood being secured to the luvrrcl valve, and the barrel valve and hood being conveniently removable to expose the nozzle for the adjustment of the lcwl of the fuel.

5.1a a constant level aspirating carburetcr, a valve chamber, a rotary valve therein having an air opening, a fuel nozzle in the air opening. means for sm'iplying liquid fuel to the nozzle and for regulating the level thereof, the valve chamber having an opening for the removal of the barrel. valve,

m'au esa 'inlet'passages discharge, fuel nozzle in the-constant inlet passage, the two inlet passages meeting beyond the point Where the nozzle is lOCHiXBd, a barrel valve for controllingthe other inlet, a fuel valve controllin the fuel supply moving relatively to the barrel valve and in a line parallel with its axis, means for adjusting the fuel valve todetermine its leadwvhich isotherwise con stant, and means connecting it to the inlet valve, actuating means whereby the fuel valve is opened with the inlet valve and means for varying the motion of the fuel valve relatively to that of the air valve.

7.- A carburetor consisting of two inlet air passages and a delivery passage into which both said inlet passages discharge, a fuel delivery in one inlet passage which passage is constantly open, the passages meeting beyond the point at which the fuel is delivered, a valve for controlling the other inlet, a fuel valve controlling the fuel supply, means for adjusting the fuel valve to determineits lead, and means connecting it to the inlet valve whereby it is opened simultaneously with the inletvalve, and means for adjusting the fuel valve, actuating means to vary the ratio of the valve openings, the fuel valve lead being independent of said adjustment.

8. A carburetor consisting of two inlet air passages and a delivery passage into which both saidair passages open, a. fuel nozzle in one air passage which passage is constantly open, an air valve controlling the other air passage, a valve in the delivery passage. actuating means connecting said valves to movethem both, a fuel valve con trolling the nozzle, means'connected to the inlet and delivery valve actuating means for opening and closing the fuel valve as the inlet and delivery valves are opened and closed, and means for adjusting said means to vary the relation between the motion of the fuel valve and that of the inlet and de livery valve.

9. .lna constant level carbureter, in combinati'on an air passage it fuel nozzle discharging into the air passage, a valve controlling the air passage, means for. actuating the valve, a, cam, a follower connected to both valves and engaging the cam to open the fuel valve as the air valveis opened,

the cam being substantially cylindrical as to the portion of its surface engaged bythe follower when. the fuel valve is in initial position and pivoted to swing about the axis of such cylindrical portion.

A- carburetor consisting of an air pas:

menace sage, a carbureting passage constantly open,

' a fuel nozzle in the carbureting passage, a

operate tiat valve, means for fuel valve cooperating with the nozzle, valve for controlling the air passage, means connecte iilGI'EtO and operated thereby for opening the fuel valve, said means being adjustable to vary the relative areas of opening of the two valves, and means for adjusting the lead of the fuel valve, the lead being otherwise constant and independent of the aforesaid means for opening the valve.

11. In a carburetor in combination an air passage, a fuel delivery therein, a valve for controlling the air passage, means for actuating said valve, a fuel valve, means controlled by the actuating means for operating the fuel valve, means for adjusting said operating means to vary the relative motions of the valves, means for adjusting the lead of the fuel valve, and means for temporarily varying the arrangement of the valve operating means to change the relations of the valve openings to compensate for temporary alteration of running conditions. I

12. In a carbureter in combination an air passage, a valve controlling the same, means for actuating the said valve, a fuel delivery in the air passage, a fuel valve, a cam, a follower therefor connected to the actuating means'and to the fuel valve to operate the same, means for adjusting the throw of the cam to vary the relative motions of the valves, means for adjusting the fuel valve to determine its lead and other means for temporarily increasing the opening of the fuel valve relatively to that of the air valve at all open positions greater than the least opening of the air valve without affecting the lead of the fuel valve to compensate for changes of running conditions.

13. "in a carbureter in combination an air passage, a valve controlling the same, fuel. delivery in the air passage, a fuel valve, cam pivotally mounted, actuating means for one alve, a follower on the otler valve engaging the cam andconnected to the actuating means to move the follower over the cam to operate that valve, means for adjusting the cam about its pivot to vary its throw, and other means for swinging the cam to compensate for temporary changes of running conditions.

. 1 5, In a carbureter in combination an air passage, a alve controlling the salne, a fuel delivery in the air passage, a fuel valve, cam pivotally mounted, means for actuating one valve, a follower on the other valve engaging the cam and connected to the op erating means to be moved over the cam to adiusting the cam about its pivot to vary its throw, other means in the form of a wedge, and means for advancing the same beneath the cum to swing the cam to.give an increased opening of the fuel valve and compensate for temporary changes of running conditions.

15. In a carbureter the combination of a carburcter chamber having an air inlet passage and a mixture outlet passage arranged one on each side of the carbureting chamber opposite each other, a fuel nozzle supplying fuel to the carbureting chamber and centrally located between the air inlet and mixture outlet, an independent air inlet surrounding the fuel nozzle, a cylindrical throttle valve having oppositely located ports, one controlling the airinlet and the other the mixture outlet, the gas outlet port having a lead of size corresponding to the size of the independent air inlet surrounding the fuel nozzle.

16. In a carbureter the combination of a carbureting chamber having an air inlet and mixture outlet arranged axially of each other and on opposite sides of the carbu reting chamber, a fuel supply nozzle arranged (ten-- trally of the carbureting chambe' and midway between the air inlet and mixture outlet, incependent air supply surrounding the fuel nozzle and entering the carbureting chamber, this air supply drawing air from the main air inlet beyond the throttle valve, a ti rottle valve cylindrical in form andliaving oppositely disposed ports, one controlling the air inlet and the other the mixture outlet, the mixture outlet port having a lead-notch in one side of a size corresponding to the size of the independent air inlet surrounding the fuel nozzle.

17. In a carbureter the combination of a carhurcting chamber, cylindrical in form and ha ing a vertical axis, and provided with an air inlet port on one side and a mixture outlet port on he other side. said ports being axially arranged, said axis'being at right angles to the axis of the carburetor chamber, the air inlet port being divided into two parts. one of which enters the carbureting chamber axially of the outlet port ivhile the other is constantly open and enters the carbureting chamber through its bottom axially of the carbureting chamber,

a, fuel nozzle located axially of the carbureting chamber entering it through the bottom and centrally of the air inlet port. a cylindrical throttle valve located -within the carbureting chamber and having inlet and outlet ports in itssides oppositely located, a bathe-hood located within the carbureting chamber and over. the fuel nozzle and its surrounding air inlet.

18. In a constant level carburetor having a delivery passage, two separate and dis-, tinct air passages, one being constantly open primary air passage, the other a secondary air passage, a barrel valve for controlling the delivery and secondary air assage, a fuel nozzle in the delivery en of the constant air passage, a fuel valve, a cam of arcuate form concentric with the fuel valve, a follower for the cam connected to the fuel valve ton'iove the latter, the cam being pivotally mounted and means for ad justing the cam about its pivot to vary the effective throw thereof.

19. In a constant level carburcter, a constantly open primary air passage, :1 second ary air passage, a 'carbureting chamber and an outlet passage, the primary and secondary air passages having their delivery ends in the carbnretin chamber, a fuel noz- 211': in the outlet end oi the primary air passage, a barrel valve having ports controlling the secondary air passage and the outlet passage, an arcuate can pivotally 1nounted, a fuel valve, a follower for the cam con nected to the fuel valve and to the barrel valve to rotate with the barrel valve and move over the cam, opening and closing the fuel valve as the barrel valve ports are opened and closed, and means for adjusting the cam about its pivot to vary its throw and hence to vary the throw of the needle valve in proportion to the barrel valve.

20. In a, constant level carbureter, a mi fnary air passage, a secondary air passage, a carbureting chamber and a delivery passage, the primary and secondary air passages having their delivery ends in the carbureting chamber, a fuel nozzle in the outlet end of the primary air passage, a barrel valve in closing the fuel nozzle and the delivery end of the primary air passage and having ports controlling the secondary air passage and the delivery 'J'a'ssag'e an amuate cam pivotaclly mounte a fuel valve, afollower for the cam connected "to the fuel valve and to the barrel Valve to rotate with the barrel valve-and move over the cam, opening and closing the [fuel valve as the barrel valve ports are adjusting t a: cam about its pivot to vary its throw and hence to vary the throw of the needle valve in ffi'op lfrtioil it the barrel valve V In a constant level earbareter, a consamtly open primary air passage, '11 secondary air passage, is carbureti'ng chamber and anont l'et passage, thep'rimary and secondary air passages having then-delivery ends in the carbureting chamber, a fuel nozzle in the outlet end of the primary air passage, a barrel valve havin a port control lin 'the'secondary air passage, an afrcuate cam pivotally mounted, a fuel valve, a 01- loivcr for "the cam connected to the fuel valve and 'to the barrel valve to rotate with the barrel valve and move over the cam, opening and elos ingtheiad valve as the barrel valve ports are and closed,

opened and closed, and means for and meansrfor adjusting the cam about its, pivot to vary its throw and hence to vary the throw of: the needle valve in proportion to the barrel valve, the cross-section of the cam being curved so that the cam path is ldentical in iorm. in all positions of adjustment.

In a constant level carbureter, a constantly open primary air passage, a secondary air passage, a carburetingchamber and an outlet passage, the primary and secondary air passages having their delivery ends in the carburetin chamber, a fuel n'ogzle in the outlet end 0? the primary air passage, a barrel valve having ports controlling the sccondary air passage and the delivery passage, the delivery port havin a lead opening equal in area to the area 0 the constant airpassage, an arcuate cam pivotally mounted, a fuel valve, a follower for the cam connected to the fuel valve and to the barrel valve to rotate with the barrel valve and more over the cam, opening and closing the fuel valve as the barrel valve ports are opened and closed, and means for adjusting the cam about its pivot to vary its throw and hence to vary the throw of the needle valve in proportion to the barrel valve.

p 23. In a constant level carburetor, a U- shaped constantly open primary air passage, a fuel nozzle in the delivery end of the passage, a secondary air passage connecting the ends of the U-shaped passage, 11 barrel valve controlling the secondary air passage, a follower pivotally mounted on the barrel valve and connected to the fuel valve, a stationary cam mounted for adjustment in a plane parallel to the axis of the barrel valve. the follower being adapted to coliperate with the .cam and means for adjusting the cam to vary the motions of, the fuel and air valves.

24. In a carbureter, a fuel valve and i1. barrel valve, a stationary cam mounted on a pivot substantially at right angles to the radius of the barrel valve drawn to the center of the pivot, the cam being of arcunbe form concentric about the axis of the barrel valve, n'n'ams for adjusting the cam about its pivot, a follower for the cam connected to the barrel valve to rotate therewith and connected to the fuel valve to move the lat ter as the barrel valve is rotated.

25. In a carbu'reter, a fuel valve and a barrel valve, a stationary cam mounted on a pivot substantially at right anglesto the radius of the barrel valve drawn to the center of the pivot, the cam being of ercuate form concentrio'about the axis of the bu:- relvalvemeansfor adjusting the cam about its pivot, the cross-section of the cam bein carved so as to give a path of substantiall? animal eonwul as the mm is uhusmd, up

only variation of the path being change of of Maryland, this 14th day of February angle due to the adjustment, a tolllower for 1911. the cam connected. to the barre valve to rotate therewith and connected to the fuel LEWIS Z 5 valve to move the latter as the barrel valve Witnesses:

is rotated. J. A. HILLEARY, Jr., Signed by me at city of Baltimore, State EDWIN F. SAMUELS.

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