US1450628A - Carburetor - Google Patents

Description

- Apr. 3, 1923. 1,45%),628

J. M. FLANNERY GARB'JRETOR Filed App. "7, 1922 5 sheets-sheet l A Trap/v51.

Apr. 3, 1923.

J. M. FLANNERY CAR-BURETOR 5 sheets-sheet 2 Filed Apr.

Patented Apr. 3, 1923.

CARIBURETOR.

Application filed April 7,

To all. whom it ma concern Be it known that I. JOHN M. FLANNERY. a citizen of the United States, residing at Detroit, in the county of W'ayne and State of Micl1igan,'have invented certain new and useful Improvements in and-Relating to Ca.rburetors,' of which the following is a specification. p

- This invention relates to a carburetor for supplying carbureted air to an internal combustion motor.

One object of the invention is to provide a carburetor of relatively simple construction. i t i I Anotherobject of the invention is to provide acarburet'or which effects proper mixtures of air and gasoline at all times independently of the engine speed or increases therein, whereby efficient operation. rela-- tively quick pick-up' in speed and maximum mileage is insured.

A further object of the invention is to provide an improved carburetor having a. plurality of mixing tubes and a. throttling means which is so arranged that it will.

throughout its range of movement from closed to full open position and back to closed position insure the flow of the conibustible charge from either or both mixing tubes to either side of the throttling means. so that where a plurality of manifolds or av manifold having a plurality of branches are used, the mixture or charge flowing to each thereof will he of the same character.

Other objects of the inventioirivill be apparent to those skilled in-the art to which my invention relates from the following description taken in connection will the "accompanying drawings. wherein Fig. 1' is an elevation of a carburetor enibodying my invention Fig. 2 is a longitudinal section through the carburetor on theline 2--2 of Fig. 3.

Fig. 3 is a section on the line 3-4; of

Fig 1.

1g. 4 IS a section on the line 4-4 ot Fig. 1.

1922. Serial No. 550.493

Fig. is a section Figs. 4 and 6. p

Fig. 8 is a section on the line 88 of Fig. 3.

Fig. 8" is a fragmentary sectional view on the line Q.8" of Fig. 1. l

on the line 77 of Fig. 9 is a fragu'ientary'view on the line 99 of Fig. 1, parts being broken away.

Fig. 10 is a perspective view of one ofv the levers; for operatively connecting the throttle valve and the supplemental valve.

Referring to the drawings, 1 indicates a chamber; comprising a bottom wall 2 and side walls 3, arranged to hold gasoline or other combustible fluid and serve as a constant source of fuel supply for nozzles. 4, 5, to be later referred to. 6 indicates an air intake preferal'ilv of tubular shape in cross section. The air intake 6 may extend horizontally. its side and lower walls being preferably formed integrally with the bottom and sidewalls 2.3. of the fluid chamberl. 7 indicates a web extending transversely between the side walls of the air intake 6 outer end a plug 12 having a head 13. The

fitting ll is 'lormcd with a duct 14 through which the fuel flows to the chamberl. The wall for the upper portion of the duct 14 is cut away to form a seat for a valve 15 which is preferably a needle valve. The stem 16 of the valve li'fcxtends upwardly and. is guided'and operated in the manner to be later described. 17 indicates one or more ports formed in the wall of the nipple 10 and opening at their inner ends into the duct 14 therethrough. 18 indicates a coil pling member constructed for connection with tlie'nipple 10. as shown. the coupling 19 (its over and surrounds the nipple its side walls 19 being [)IQflfltlbl) shaped to 40 the form a channel around the nipple to simulg taneously supply fluid to all of the ports 17. The coupling18 is formed with an Opening 20, through which the reduced end of the 5 plug 12 extends for connection with the inner wall of the nipple 10. When so connected, the head 13 of the plug 12 engages the coupling 18 and clamps it in position.

around the nipple and a ainst the bottom 10 wall 2. The plug 12 is preferably boredout as shown at 21, a portion of such bore being screw threaded to adjustably support a valvestem 22' in the bore. The stem 22 is hollow and at its inner end itis formed with one or more laterally extending ports 23, so that when the stem 22 ismoved inwardly by its rotation, the ports will be positioned above the inner end of the plug 12 and thereby permit draining of the'chamher l-and conduits leading thereto.

coupling 18 is provided with a pipe section 18, to which a fuel supply pipe (not shown) is connected in a well known way.

The supply of the fuel to the chamber 1 'ispreferably controlled by a float which may pomprisel a hollowmem'ber 24. The float 24 surrounds-the stem 16, being guided in' its up and dowiranovenients thereby. 25 indicates a cover for" the chamber 1. The cover 9 may be held in placeby a plurality of cap screws 26, secured an allgned {(ormed in lugs 27 carried by the wall 3 and c ver 25. The central portion of the cover 25 is formed with an opening 28 in whichthe upper end of the valve stem 16 is slidably supported. 29 indicates an annular boss provided on the cover 25 and surrounding the guide opening-28. The outer wall of the boss 29 is screw threaded to permit connection therewith of a thimble 30 which encloses but permits access to the upper end of the valve stem 16 for reasons that will later appear. 31 indicates pair of spaced lugs depending from the cover 25 and supporting between them, preferably at opposite sides of the stem 16, a pair of levers 32. The outer ends of the levers 32 engage the upper face of the float 24; the inner ends of the'levers are disposer. between and engage a pair of spaced collars 33 and act therethrough to control the valve 16 due to rise and fall of the float 24. To permit of adjustment of the valve stem 16 relative to the float 24, whereby the fluid supply may be properly controlleihthe valve stem 16 is formed of two sections 16, 16 the latter being a sleeve carrying the collars 33 and adjustably fitting the section 16 and adapted to be fixed in its adjusted osition by a nut 16. By loosening the nu 16 and engaging the slot in the free end of the sleeve 16 (after the removal of the thimble 30) with a suitable tool, the sleeve 16 may be turned to adjust itlongitudi-,

nally of the section 16.

The connection 38 may '39, which is supported openings" leakage.

34 indicates a valve, preferably of the butter-fly type, disposed in the air intake or pipe 6 and movable oradjustable to open 'orclose the passage through the intake a greater or lesser amount as conditions may 7 require; more particularly the valve is operated to close the passage through the in-v take at the time of starting the motor. The valve 34 is fixed toa shaft 35, which is mounted at its opposite ends in bearings '01- openings formed in the: wall of the intake 6. At one end outside of the intake,- the shaft 35 is provided with a crank arm 36, which carries at its free end a clamping device 37 to which an operating connection 8 38 is connected in any well known manner.

guided by a tube by a bracket 40 mounted on a boss 41 (see ig. 2) forming one bearing for the shaft 35.

I will-refer to the nozzle 4 as the main supply nozzle, as it will be apparent from the drawings and the following description that the mixing tube for the nozzle 4 con- .tinuously supplies carbureted air to. the engine or motor (not'shown) except as such supply may be regulated or controlled by a throttle 42; whereas, the mixing tube for the nozzle 5 is normally closed and does not open to supply the carbureted air until 05 the throttle 42 is opened'to or beyond a predetermined position, as will be later set forth.

The nozzle 4 comprises a tubular member 43. Near. its upper end the tubular memher is reduced as shown at 43 and adjacent its reduced portion, its inner wall iscontracted, as shown at 44, thereby forming at the lower end of the contracted portion a valve seat for a needle valve 45 and above the contraction. portion a'cup shaped open end 4, from which the gasoline is discharged.

The lower end of the tubular member "43 is provided with screw threads, as shown no 'to form a shoulder against Which the tu- 116 bular member is tightened when its end 46 is positioned in the opening 47. 48 indi-, cates an opening formed in the bottom wall 2 in alignment with the opening 47; The wall of the opening 48 is screw threaded to detachably'receive a plug 49; the plug being provided with a collar 49, which is tightened against the wall 2 when the plug is positioned in the opening 48. 49 indicates a gasket interposed between the 001- lar 49? and the bottom wall 2 to prevent The plug 49 isformed with an opening 49 in which the screw threaded portion of a stem 50 of the needle valve 45 is adjustably supported. A gland 49 may be provided around the needle valve stem 50 As shown, the valve stem 50 extends through the tubular member 43 but is of such size as to permit the fuel to flow around it through the tubular member and through the orifice 44 when the valve is open. At itslower end the stem 50 may be provided with arms 5O whereby it may be readily turned.

51 indicates a tubular boss formed integrally with and extending from the upper face of the wall 8, and 'arranged to support-a tubular member 54, which forms one of the elementscomprising the nozzle 5. As shown in the drawings, the opening 48 and boss 51 are arranged so as to support the tubular members 43 and 54:, axially of the Venturi tubes, 52, 53, to be later referred to, with which they are respectively associated. At its upper end, the inner wall of the boss 51 is provided with screw threads to engage and support the screw threaded lower end of the tubular member 54. The tubular member 54 extends upwardly, its upper end terminating in the Venturi tube 58 preferably at a point slightly above the upper discharge end of the nozzle 4. The wall of the boss 51 is thickened at its lower end to form a bottom wall 55, and such bottom wall. is formed with an opening 56, which leads through the wall. 8 into the conduit 9. 57 indicates a supply tube having a' screw threaded portion 58 engaging the screw threads provided on the walls of the openiug 56, whereby it is rigidly supported. The tube 57 extends upwardly through the boss 51 and the tubular member 54, terminating in the latter at a point below the gas level which is maintained in the nozzle 5 by the chamber 1. As shown, the supply tube 57 is smaller in size than the boss 51 and tubular member 54, so as to purpose to be later set forth.

provide around it an annular space 59 and a chamber 60 in the boss 51, in order that the fuel rising in the tube 57 may flow over its upper or discharge end and through the space 59 irtothe chamber 60 for a end of the supply tube 57 is preferably enlarged to form a shoulder 61, which is tightened against the under face of the wall 8. when the tube 57 is positioned, the inlet end of the tube being shaped to form a seat for a. needle valve 62. 63 indicates an opening formed inthe bottom wall 2 in alignment with the opening 56. The wall of the opening 63 is screw threaded to detachably receive a plug 64: the plug being provided with a suitable collar 65 which engages the wall 2 when the plug is positioned. 66 indicates a gasket interposed between the collar 65 and wall 2 to prevent leakage. 67 indicates an opening formed in and extending through the plug 64, the wall of the The lower stem 62 of the needle valve 62, whreby the latter may be adjusted toward and from its seatto regulate the supply of fuel to the tube 57.- A gland 68 may be provided around the valve stem 62.

opening being provided with screw threads to engage screw threadsprovided on the preferably terminate in a horizontal plane to form a seat for a conduit section indicated as an entirety at 69, and so shaped and arranged that the side wall 3 ofthe chamber forms an end wall for the air intake 6' to direct 'the air upwardly and around the nozzles 4, 5, and the nozzles l, 5, are disposed in a plane extending diametrically of the conduit section 69 so as to center'themwith respect to the Venturi tubes At their opposite sides, the intake 6 and section 69 are provided with lugs 70 formed with aligned openings through which suitable cap screws 70 extend to secure the conduit section 69 to the air intake 6.

The conduit section69 is preferably a casting. The lower portion of the section 69 is preferably elongated from side-to side and provided with a-transverse wall 69 arranged to form within said lower portion a relatively large mixing chamber 71 above the nozzle and a relatively small mixing chamber 72 above the nozzle 4, the chamber 72 constituting the main mixing chamber and the chamber 71 a supplemental or secondary mixing chamber. The upper portion of the casting is preferably contracted to form a main cond lit 73 into which the carbureted air ,is delivered: The conduit 7 3 is connected in any desired manner with the intake manifold of the motor. The flow or supply of the carbureted air from the conduit 73 to themanifold is controlled by the throttle 42. The-wall 69 is curved and co-operates with the-adjacent side and end walls of the section 69 to form a seat for the upper portion of the Venturi tube 53 to support it concentric to the nozzle 74 indicates a wallsen-tending across the lower end of the ch amber 72. The wall 74 is preferably formed integrally with the adjacent end and side ,ivalls of the intake 6 and is shaped to cooperate with the lower end of the wall 69 to close the chamber 72 at its lower end. "5 indicates an opening formed in the wall 74 concentr: to the nozzle l and serving as a seat for the Yenturi tube 52. The Venturi tube 52 is preferably provided with a shoulder 52 which engages the upper face of the wall 74 so as to support the tube in the opening'75.

As shown in the drawings, the Venturi tubes 53, are of a size to insure the dis- -zles as the air is drawn up through them.

nected to or formed integrally with the secchamber 72 through openings 77 formed tion 69 and both Venturi tubes may be supported by either the sections 69 or intake 6.

76, 76 indicate valves foradmitting air from the intake 6directly into the mixing in the wall 74 without passing through the .76 preferably comprise balls which seat through a wide range of venturi and constituting, in effect a bypass. The walls of the openings 77 are shaped to form seats for thevalves 76. i The valves themselves by gravity. Each ball 76 is lifted by the vacuum created by the engine and permits air to pass to the mixing chamber 72, thereby preventing as rapid increase in suction effect as would take place. if the air intake were of fixed area, and insuring sufficient air supply in-proportion to the vacuum created to provide a proper'carbur'eting mixture with the gasoline being discharged from the nozzle 4.

The air primes through the by-pass' valves 76 with relatively great velocity, and acts uponthe carbureted air 'in or passing .through the mixing chamber 72 to form a properly combustible change. By this arrangement I am enabled to provide proper mixtures of fuel' for driving operations relatively low speeds with only the mixing tube 72 operating. As the opening of the valves 76 is controlled by the suction effect ofthe engine they supply sufficient air for mixture with the carbureted air from the venturi- 52, to 'form t a properly mixed combustible charge in the mixing tube or chamber 7 2 accordingly as a larger quantity of carbureted air.is disch In the preferred form of the construction,I provide two valves 76 preferably disposed .between the Venturi tube 62 and the wall tion to the suction effect at all 69 and at opposite sides of a plane cutting the axes of the Venturi tubes 52 and 53. However, agreater or lesser number of valves may be provided, if desired. By the arrangement disclosed the sizes of each valve and valve seat n'iay be relatively small and more sensitive control may be effected in insuring the admission of air in propor times: Furthermore, it will be seen that I am enabled to maintain the correct supply of fuel while arged thereto from the venturi.

1,4eo,eee

enough air at all times to insure a properly mixed combustible charge for all running conditions, with resulting economical operation of the engine. As the balls are gravity operated, they are uneated at all times when the suction effect eaches a predetermined degree. The balls 76 are guided by the Wall 69* and the walls of the section 69 and venturi 52 as will be clear from Fig. 4;. The balls 76 are limited in their opening movement by a rod' 79, preferably supported'at its opposite ends in recesses '80 formed in the ends of a pair ofscrew plugs 81, fitting openings formed in the side walls 6f the conduit section 69.

mixing it with charge end of the supplemental or secondary mixingchamber or tube 71. The valve 82 is open for the purpose to be later set forth, at which time airwill-be sucked in from the air intake 6 and the air in turn will draw fuel from the'jet 5 for mixing therewith. The valve 82 is preferably of the butterfly type. It may be secured to a rock shaft 83. The shaft 83 is preferably-mounted at one end in a tubular boss 84 formed on and extending laterally from one wall of the section 69; its opposite end is mounted inan opening 85 formed inthe, metal which constitutes the wall 69 between the tubes 71, 72. The-shaft 83 extends through the boss '84 and carries at its outer end a crank .86 by means of which the valve 82 is operated. The hub of the crank 86 is preferably formed with an annular recess to form a space around the shaft 83 for a coiled spring 87, one end of which may be secured to the crank and its other end anchored to a pin 88, as shown inFi'g. 3'. The pin 88 may serve .as a stop to limit the'movement of the crank 86 under the influence of the spring 87 when the valve 82 is in the closed position (see Fig. 1). The spring 87serves to maintain the valve 82 closed, but permits it to be opened in the manner to be later described.

As shown, the throttle valve 42 is arranged to control the flow of the carbureted air from the main mixing tube and also from the sup-. plemental or auxiliary mixing tube. I prefer to use a butterfly type of'throttle to control the conduit 73. The throttle valve 42 is preferably rigidly connected to a shaft 90- mounted at its opposite ends in the walls of the conduit-section 69, one end of the shaft being extended and carrying at itsouter end a crank 91, whereby it may be operated through suitable devices (not shown) in the usual manner-L As shown, the shaft 90 extends transversely of the conduit; 73 and is disposed in a plane which cuts the axes of the mixing tubes 71, 72 and nozzles 4, 5, therein? In such arrangement the throttle valve will. properly control the flovv 0f the carbureted air through the outlet conduit operating, so that the same character of mixture will pass one side of the valve 42 indicates a lug projecting from the wall of at any instant.

as passes the other side thereof. Accordingly, it will be seen that where the conduit is con nected to a plurality of manifolds or a manifold which has a plurality of branches, the

same character of mixture will be supplied to each. Tlnsarrangement is particularly advantageous where the mixing tubes have different capacities as herein disclosed. By

preference, both ends of the shaft 90 are extended and may carry cranks either or both of which may be utilized for operating the valve 42. Either or both cranks may be ad'- justably connected to the shaft 90 topermit necessary take-ups and proper connection of the operating devices therewith. 92

the conduit section 69 and disposed in the path of movement of an element, such as a screw, carried by a lug integrally connected with a lever 94 (to be later referred to), whereby the movement of the valve 42 is stopped at itsclosing position.

-.Means are provided for connecting the valves 42 and 82 together'for operation in a predetermined relationship, whereby the latter is positively operated by the ft rmer or through its operating means, to e1 .ect a supply of carbureted air from the sipplemental or secondary mixing tube 71 when an auxiliary supply is needed and in quantities to meet the requirements of the motor necting means comprises the following instrumentalities; the lever 94 (already referred to) which is keyed or otherwise secured to the shaft 90. The outer end of the lever 94 is formed with an. elongated slot-95. 96 indicates a link formed in its-upper end with an opening through which and the slot 95 a pin 97 projects to pivotally connect the link 96 to the lever 94. The pin 97 is shaped to permit free pivoting of the link 96 and lever 94 as the latter is operated, but is adapted to be adjustably fixed to the lever .94- at either end of the slot 95 or at any point between said ends, accordingly as circumstances may require, .or reasons which will later be explained. At its lower end the link 96is provided with an elongated slot 98, through which projects a, pin 99 ,carried by the free end of the crank 86, the pin 99 and slot 98 serving to pivotally and slidably connect the link 96 to the erank 86. The pivot pin 99 is preferably headed so as to engage the link 96 at either side of the slot and maintain these parts in connected relationship. The positions of the innerend wall of the slot 95 relative to the shaft 90,

the inner end wall of the slot 98 relative The above referred to conmay be desired or foundnecessary in the operation of the engine. The slot 95 permits the necessary adjustment of the connections and the. resultant adjustment of the valves 42 and 82 relative to each other, whereby 'efficient and economical operati n of the engine is effected.

100 indicates a supplemental gasoline well connected at its lower end by a duct .101 with the chamber 60. The well 100 and the duct 101 are formed in thickened portions of the walls forthe chamber 1 and air intake 6. The upper end of the well 100 is preferably enlarged and provided with screw threads, whereby a plug or cap member 102 may be provided to close the well. The plug may be formed with an air inlet opening or duct 103 so that the gasoline in the well may be readily supplied to the nozzle 5 by the suction effect of the engine.

As shown in the drawings, the supplemental well 100 is not connected directly with the float chamber 1, but is connected to the supplementary nozzle 5 from which it is supplied, the gasoline overflowing the tube 57 or passing directly through the port 57. In operation, where the auxiliary valve 82 is suddenly opened and the vacuum'of theengine causes a sudden and large intake of air to pass the nozzle and draw all of the fuel filling the nozzle 5, the well 100 serves to provide an immediate additional supply of gasoline, sufficient to meet-the engine needs. As the gasoline well 100 is connected to the nozzle 5 and receives its'supply therefrom, it will remain empty until the'valve 82 is closed, whereupon it will refill in the manner already described. The well 100 is of a size to hold a suiiici'ent supply of gasoline to provide an ample charge of fuel from the nozzle 5 in the event the throttle 42 and valve 82 are opened to full open position; hence such supply will pro- \ide the necessary fuel to insure a quick pick-up in engine speed to the full limit of speed of the latter, if desired.

' In the construction herein described, I provide a carburetor in which the air and gasoline are supplied in proper quantities at all times, so that theen ine maybe properly controlled to run on high, low and intermediate speeds, and effect relatively quick changes in speeds. By providing a I main mixing tube, a supplemental mixing tube, and by-pass valves for automatically supplying air from the air intake to the mixing chamber, I am enabled to provide proper mixtures at a l times, and to so reduce the vacuum effect on either or both noz'zles that .at no time will there be a failure of gasoline supply.

In my construction of carburetor it will be noted that I provide a relatively small mixing tube which is always openand. a relatively large mixing tube which is normally closed but is caused to supply atomized fuel in correlation to the operation of the throttle whereby ample fuel is supplied as the speed of the engine increases. In such a construction the fuel supply is in proportion to the demands of the engine, being automatically supplied and shut off as the speed of the latterincreases and decreases. This arrangement therefore provides relatively great flexibility in driving where the carburetor is associated with an automobile.

By providing two mixin tubes one of which augments the-other, tie main mixin tube is not called upon to supply all of the the fuel required as the. engine speeds up; hence when the engine speed increases the fuel supplied is augmentedby the supple- 'mental mixing tube 71, both tubes 71, 72,

then supplying the required fuel. Accordingly I am enabled to operate the engine over a wide range of speedsand maintain at all times an ample supply of carbureted an.

It will be evident that many modifications of the apparatus can be made without interfering with the functions of the same or affecting the results accomplished; hence I wish to be understood that my disclosures and the description herein are purely illustrative and are not intended to be in any sense limiting, as widely differing einbodiments and applications of the invention will suggest themselves to those skilled in the art to which my invention relates without departing from the spirit and scope thereof as defined by the appended claims.

What I claim is:

1. In a carburetor, the combination of a supply chamber, an air intake, an outlet conduit, a pair of mixing tubes each com municating with said intake and said conduit, a nozzle disposed in each said mixing tube connected with said chamber, a throttle for controlling the flow of carbureted air through said conduit, a valve for contiol ling the flow of carbureted air from one of said mixing tubes into said conduit, means for operating said throttle and said valve, and a valve mechanism for admitting air into one of said tubes independently of said communication of the latter tube with said intake.

'2. In a carburetor, the combination of a supply chamber, an, air intake, an outlet conduit, a pair of mixing tubes each communicating with said intake and said conduit, a nozzle and a venturi-disposed in each,

said mixing tube, each venturi being open at its lower end to receive air from said intake and each nozzle being connectedwith said chamber, a throttle for controlling the flow of carbureted air through said conduit, a valve for controlling the flow of carbureted air from one of said mixing tubes into said conduit, means for operating said throttle and said valve, and a valve mechanism for admittin air from said intake into one of said mixing tubes around the nozzle and venturi opening thereinto.

3. In a carburetor, the combination of a supply chamber, an air intake, an outlet conduit, :1 pair of mixing tubes each com municating with said intake and said con duit, a nozzle and a venturi disposed in 'each said mixmgtube, each venturi being open at its lower end to receive air from said intake and each nozzle being connected with said chamber, a throttle for controlling the flow of car-bureted air through said conduit,

va valve for controlling the flow of carbureted air from one of said mixing tubes into said conduit, means for operating said throttle and said valve, and a valve mechanism for admitting air from said intake into one of said mixing tubesL-around the nozzle and venturi leading thereinto, the valve element for'said valve mechanism comprising a member which is ravity seated and operated to open thevalve when the vacuum is sufficient to overcome its weight.

4. In a carburetor, the combination of a gasoline supply chamber, an air intake, an outlet eonduit, a pair of mixing tubes each communicating with said intake and said conduit, a nozzle disposed in each of said mixing tubes connected with said chamber,

a valve for controlling the How of carbureted air through said conduit, a valve for controlling the flow of carbureted-air from. one of said mixing tubes into said conduit, operating connect-ions between said valves, means for operating one of said valves, and a valve mechanism for admitting air from said intake into one of said tubes independently of said communication between the latter tube with said intake.

5.. In. a carburetor, the combination of a gasoline supply chamber, an air intake, an

outlet conduit 21 pair of mixing tubes each communicating with said intake and said conduit, a nozzle and a venturi disposed in each of said mixing tubes, each venturi be ing open atits lo'vver end to receive air from said intake and each nozzle being connected with said chamber, a valve for controlling flow of carbureted air through said conduitfa valve for controlling the flow of mixed carbureted air from one of said mixing tubes into said conduit, operating connections between said valves, means for op erating one of said valves, and a valve mechanism for admitting air from said intake into the other mixing tube around the nozzle and venturi opening thereinto.

6. In a carburetor, the combination of a supply chamber, an airintake, an outlet conduit, a pair of mixing tubes each communicating with said conduit, a nozzle disposed in each said mixing tube connected with said chamber, a venturi. mounted in one of said tubes and surrounding the nozzle disposedtherein, a wall extending tr versely across the other tube and formed with a plurality of openings, the wall of one of which is concentric to the nozzle disposed in said tube, a vent-uri supported in said last mentioned opening in said transversely extending wall, a throttle for con? trolling the flow of carbureted air through said outlet, means for operating said throttle, a valve for controlling the flow of carbureted air from one of said mixing tubes into said conduit, means for positively operating said valve, and a valve tor the other opening in said wall tor'admitting airv from the intake through said opening into the adjacent mixing tube.

7. In acarburetor, the combination ot'a fuel supply chamber, an air intake, an outlet conduit, a pair of mixing tubes each com municating with said intake and said conduit, a nozzle disposed in each of said Inixing tubes and connected with said chamber, one of said nozzles comprisinginner and outer concentrically arranged tubes, the inner one of which is connected to said chamber, said inner tube terminating at a point below the level of the fuel to permit the fuel to over flow into the outer tube, a valve for controlling the flow of -arbureted air through said conduit, 21 valve for controlling the flow of carbureted air from one of said mixing tubes into said conduit, operating connections between said valves, means for operatingone of said valves, a supplemental vented fuel well, and a connection betweenthe lower end of said well and said outer nozzle tube through which said. well is filled and emptied.

' 8. In a carburetor, the combination of a fuel supply chamber. an air intake, main and secondary mixing tubes each communicating with said intake, an outlet conduit into which said tubes open, a nozzle disposed in each said mixing tube connected with said chamher. a venturi surrounding the nozzle in said main mixing tube, a throttle for controlling the flow of carbureted air through said con duit, a valve for controlling the flow of carbureted air from said secondary mixing tube into said conduit, means for operating said throttle and said valve, and means responsive o fluid pressure for supplying a variable quantity of air from the intake. around'the nozzle and the venturi in said main mixingtube.

9. In a carburetor thecombination of a wit said chamber, a venturi'in one of said tubes, a gravity seated air valve in the mix ing tube having said venturi therein and torminga by-pass therearound from said intake, and a-valve for con itolling the flow of carbureted air from, the other of said tubes into said conduit.

10. In a carburetor, the combination with a fuel suppiy chamber, of a relatively small mixing tube having a fuel nozzle for low speed operations, a relatively large mixing tube having a fuel nozzle, said relatively large mixing tube being supplemental to and co-ordinat'ed with said first-inentioned mixing tube for higher speed. operations, an air intake, means for admitting air from. said intake to said mixing tubes, an outlet to which both said mixing tubes are connected, valves for said outlet and said supplemental mixing tube, and mechanism for admitting ir to said relatively smallmixing tube independently of said first mentioned air admitting means. 1, 11. In a carburetor, the combination wit a fuel supply chamber, of arelatively smallmixing tube having a nozzle connected to said chamber for low speed operations, a relatively large mixing tube having a nozzle con nected to said chamber, said relatively large mixing tube being supplemental to and coordinated with said first mentioned mixing tube for higher speed operations, an air intake, means for admitting air from said intake to said mixing tubes, an outletto which i both said mixing tubes are connected, valves for controlling vin co-ordinated relationship the How of carbureted air througlrsaid outlet and from said relatively large mixing tube to said outlet, and a valve mechanism for admitting air to said relatively small mixing tube independently of the above said chamber and a venturi therein for low speed operations, a relatively large mixing tube having a nozzle connected to said chamber, said relatively large mixing tube being supplemental to and coordinated with said first mentioned mixing tube for higher speed operations, an air intake for admitting air to said venturi and the relatively large mixing tube, an outlet t which both said mixing tubes are connected, valves for controllin in co-ordinated relationshi the flow of carbureted air through said out et and from said relatively large mixing tube to said out: let, and a valve mechanismfor admitting air from said intake around said venturi into saidrelatively small mixing tube.

13; In a carburetor, the combination of a mixing tube of relatively small capacity having a fuel. nozzle arranged to supply carbu-reted air for'ordinary' driving speeds, a mixing tube of relatively large capacity having a fuel nozzle, said relatively large mixing tube beingco-ordinated with said first mentioned-mixing tube to supply carbureted air supplemental to that supplied thereby for higher driving speeds, an outlet to which said mixing tubes are connected, means for supplying fuel to said nozzles, a valve for controlling the flow of carbureted-air from said relativel large mixing tube, means for controlling t e flow of carbureted air from said tubes through said outlet, said control means being disposed and arranged to permit substantially equal portions of the combustible mixture to pass to either side thereof when either the mixing tube of relatively small capacity or both mixing tubes are supplying carbureted air to said outlet, and connections between said control means "and said valve,

whereby the latter is positively operated.

, 14. In a carburetor, the combination of a mixing tube of relatively small capacity, having a fuel nozzle arranged to supply carbureted air for ordinary driving speeds, a

, mixing tube of relatively large capacity having a fuel nozzle said relatively large mixing tube being co-ordinated w1th sa1d first mentioned mixing tube to supply carbureted an' supplemental to that supplied thereby for said mixing tubes communicate and a butterhigher driving speeds, an outlet to which said mixing tubes are connected, means for su )l in fuel to said nozzle means for ad- 1 7 mitting air to said mixing tubes, means for admitting air to said mixing tube of relatively small capacity independently of said first mentioned air admitting means, and means for controlling the fiow of carbureted air from said tubes through said outlet, said control means being disposed andarranged to permit portions of the combustible mixture to pass to either side thereiif from said mixing tubes when either the mixing tube of relatively small capacity or both mixing tubes are supplyingcarbureted air to said outlet.

15. In a carburetor, the combination of a fuel supply chamber, a pair of mixing tubes each having a nozzle therein connected to said chamber, an air intake for supplying air to said tubes, an outlet conduit with which 'tly valve mounted to rotate in said conduit about an axis extending transversely thereof and disposed in a plane cutting the axes of said nozzles, a devicefor controlling the How of carbureted air from one pf said mixing tubes to said'outlet conduit, and connections between said valve and said device, whereby the latteris positively operated.

16. In a carburetor, th'e combination of a fuel supply chamber, a pair of mixing tubes each having a nozzle therein connected to said chamber, an air intake for supplying air to said tubes, an outlet conduit with which said mixing tubes communicate, a butterfly valve mounted to rotate in said conduit about an axis extending transversely thereof and disposed in a plane cutting the axes of said nozzles, and valve devices disposed upon opposite sides of said plane for admitting air into one of said mixing tubes.

17. In a carburetor, the combination of an air intake, a chamber for supplyingfuel, a pair of mixing chambers each having a venturi incommunication with said intake and a nozzle connected to said supply chamber, an outlet conduit with which said mix-.

ing chambers communicate, a butterfly valve transversely thereof and disposed in a plane cutting the axes of said nozzles, a wall for closing the lower end of one of said chambers around the ventu'ri therein, said wall being formed with an opening, and a valve device normally closing said opening and arranged to admit air from said intake into said chamber around the venturi therein.

18. In a carburetor, the combination of an air intake, a chamber for supplying fuel, a pair of mixing chambers arranged side by side parallel to eachother, each including a venturi having communication with said intake and an axially arranged nozzle connected to said supply chamber, an outlet conduit with which said mixing chambers communicate, a butterfly throttle valve in said conduit secured to a shaft extending transversely thereof and disposed in a plane cutting the axcs of said nozzles, a wall for closing the lower end of one of said mixing chambers around the venturi therein, said wall being formed with an opening, a valve device normally closing said opening and arranged to admit air from said intake around said venturi into the adjacent mixing chamber, a valve for controlling the flow of carbureted air from the other mixing chamber, and connections between said throttle valve and said last mentioned valve arranged to operate the latter after said throttle valvZ 5 said fuel chamber, means controlling the acling the admission of air to oneof said mix,- ing tubes under different operatlng condit1ons,a f ue'l chamber, fuel inlet means in each mlxmg tube and communicating with conditions of operation.

tion of said mixing tubes so that said tubes signed my name. are brought into action successively, and

JOHN M. FLANNERY.

means controlling the flow through said mixture outlet arranged to divide the mixture passing therethrough in equal parts under all In testimony whereof, I have hereunto

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