Патент USA US2114970код для вставки
April 19, 193,8'. E. A. RuLLlsoN ET AL 2,114,970' CARBURETOR ' Filed Jan. 28, 19:56 . 6l# | ' ' 25 :1m l " y "28 „IH'Í s shee'gs-sheet 1 i@ y I4 l||| V /0 1`A i , ,_ V3! ` Z8 '1 Z629 f5 Z7 _I4 mul Il - I y:_ ì o _W22 _ 29 4g' 30 , 44C. . I 53@ z ‘5259 l 5?*__I \\ 49 l ‘ / Q -- (D _ 38 5? Í * 5l 55 /6 , |I 48 « i ""' 37 60 || " /Z’ 1:1 E: l. .56 . l ' Afro R N Ems Apn‘l 19, 193s. - E. A. RuLLl'soN ET AL 2,114,970 cARBuREToR Filed Jan. 28, 12936l 3 Sheets-Sheet 2 ATTORNEYS April 19, 1938. l E. A.V RuLLlsoN ET AL 2,114,970 ’ CARBURETOR Filed Jan. 2s, 1936 ’ s sheets-*sheet 3 ATTORN EYö Patented Ápl'.> 19, 1938- Q 2,114,970 _UNITED STATES >13.Ii'l?erslsz‘rioI-*Fiçl: 1,114,910 oAaBURE'ron Earl A. Rnllison and Howard B. Simmons, Toledo, Ohio, assignors to The Tillotson Manufactu ing Company, Toledo, Ohio, a corporation of Ohio , . Application January 28, 1936, Serial No; 61,197 13 claims. (ci. 261454) 'This invention relates to carburetion devices and more particularly to carburetors incorporat ing variable or flexible air controlling means.l The invention embraces a provision-of a car. 5 buretion >device embodying. a Venturi tube or se ries of Venturi tubes and Vflexible means for regu lating the amount of air passing through the car buretion device in proportion to the requirements of the enginewith which the device may be uti10 lized whereby the- efficiency of an arrangement of this character is greatly increased. . _ _ The invention contemplates the provision of a carburetor having a mixing passage embodying flexible walls which automatically provide a sub 15 stantially constant high air velocity. Another object is the provision of a multi-jet construction of carburetors wherein more than one jet is contained -in a/ removable element, the outlets or jets being arranged to obtain a maxi 20 _mum outlet area and at the same` time presenting a minimum restriction in the 'air stream. having a vplurality- of venturi's and an arrange ment of air passage having flexible walls whereby 25 the carburetor may be used with various- sizes'of internal combustion engines without the neces sity of major changes in the construction, thus enhancing interchangeability of devices as well as to extend the utilization of the arrangement to 30 various kinds and'sizes of internal combustion l - the axis‘of the venturis and the outlets of the main fuel oriiices so as to maintain under all conditions of operation a maximum suction upon the fuel oriñces. - _ Still a further object is the provision of a car- 10 , buretor wherein the float bowl is vented inte riorlyv of the mixing passage thereby eliminating any tendency to overenrichening of the mixture should there be any substantial restriction in the =air horn of the carburetor, as for example, 15 clogged air cleaners or the like, tending to de crease the pressure within the mixing passage, and further that such internal venting of the float bowl assures the passage of clean air to the bowl as such'air taken interîorly of the carbure ' tor has been cleaned by the air cleaner and for ' lAnother object is the provision of a carburetor engines. mixing passage surrounding the venturi and principal fuel orifices is fabricated of flexible ele ments so as to maintain a high velocity ofthe air passing through the mixing passage and at the same time centralizing the air stream about 5 - ' eign particles such as dust which might other clog the small fuel- orifices have been re moved from the air. ' " _ Further objects and advantages are within ythe 25 scope of this invention such as relate to the ar- 'I rangement, operation and function of the related elements of the structure, to various details of construction and to combinations of parts, ele ments per se, and to economies of manufacture 30 and numerous other features as will be apparent from a. consideration of the speciñcation and Another object is the provision of a carburet or of this character wherein the arrangement of ' drawings of a form of the invention,_which may venturis and'ñexible walls ln combination with be preferred, in which: ' Figure 1 is aside elevational view illustrating 35 35 lthe jets are so positionedvas to obtain~ a high eili ' ciency of atomization of the fuel extruded into the air stream resulting in a more uniform fuel and air mixture. f , - ^ ' ' ‘ Still a further object ofthe invention is the in 40 corporation in a carburetor of this character of a simple and effective. accelerating pump and ¿one embodiment of the carburetor of my inven- . tion; A. . , ` Figure 2 is a top plan view of the carburetor il lustrated in Figure 1; Figure 3 is a vertical sectional view of the 40 primary and secondary fuel oriñces showing the arrangement of main and supplemental venturis; power -jet arrangement, the latter arranged .to Figure 4 is -a vertical sectional view taken sub extrude additional 'fuelinto 'the engine when the throttle is opened or nearly opened to its maxi , stantiallyon the line 4-4 of Figure 2 showing 45 mum position, the accelerating jet being inde the ñexìble walled passage ofA our invention and 45 pendent of the other fuel orifices leading into the illustrating the passage of' fuel and the position mixing passage; . ' ' ` Still another object ' of’ the invention is the fof the flexible walls when the primary jet is in operation; Figure 5 is a view similar to Figure 4 showing provision of multiple jets contained in one- ele 50 ment while the several'fu'el channels necessary toy the- position of the flexible walls> of the mixing 50 passage when both primary and secondary> jets convey fuel to the several fuel o_riflces are fabri cated in a removable element, thus simplifying _` are in operation at higherair velocity'arising by reason of increased engine speeds; ^ l the arrangement of the variousjfuel passages. Another object of the invention is the provisionl ' Figure 6 is a verticalsectional view taken Asub g55v of a carburetor wherein the wall portion of the stantially on the line 6-8 of Figure‘2; . 55 2,114,970 Figure '1 is a vertical sectional view taken sub which have aligned openings through which the shaft 39 projects, the lever being split longitudi Figure 9 is an isometric view showing the ar nally as at 46; a clamping screw 45 engaging nut rangement of flexible walls of the mixing passage forminga part of our invention; Figure 10 is an isometric -view showing the pri mary and secondary fuel jet construction form 10 ing an element of the invention; Figure 11 is a side elevational view of an ele ment embodying fuel passageways forming a part of the invention; Figure 12 is an end view of the element shown 15 in Figure 11; _ ‘ Figure 13 is a vertical sectional view through the element taken substantially on the line |3-I 3 of Figure 12; ' Figure 14 is a top plan view of the intermediate 20 body portion of the carburetor, the view being taken on line I4-I4 of VFigure 1; Figure 15 is a vertical sectional view taken sub stantìally on the line I5-I5 of Figure 6 illus trating the channels leading to the idling orifice. 25 The carburetion device of our invention is in clusive _of a body structure, in the present embodi-ment composed of three principal sections, a mid dle portion I0, a separable upper portion II car rying a choke control valve arrangement and a 30 lower portion I2, supporting the throttle valve arrangement. The portions I0, II and I2 have aligned large openings forming a mixing pa'ssage I4, the portion I0 being formed with a laterally extending fuel chamber or reservoir I5 in which is positioned a float I1 pivoted as at I3, an up wardly projecting arm I9 carried >by the float adapted to engage a valve member 20 which en gages a valve vseat 2| to regulate the supply of fuel entering through the fuel inlet tube 22. 40 The upper body portion II of the carburetor is formed with a cylindrical air horn or air en trance 25 and formed integrally with portion II is a plate-like extension 2t which forms a cover for the fuel chamber I5'. 'I'he lower end of body 45 portion II and extension 25 are formed with a flange which is secured to a mating flange 21 on the body portion I0 by means of screws 25, there being a suitable gasket 29 interpositioned between the flanges providing an effective seal between 50 the parts. The intermediate body portion I0 is formed with a ñange 30 and the lower body portion I2 is’formed with a mating flange 24 which are- held together by means of screws A35, one of which is 55 shown in Figure'l. Positioned adjacent each of the flanges are gaskets 3l and 34 and positioned » intermediate gaskets 3I .and'34 are annular` mem bers 32 and 33 formed of nbre or other suitable heat resisting material. The purpose of these 60 members is to aid in preventing heat from= being transferred from the intake manifold of the en gine to the fuel chamber I6 of the carburetor, thus decreasing the tendency of the fuel to “boil” in the fuel chamber. 65 end of the shaft 39 receives a lever 44 in the form of a U-shaped member, the furcations of stantially on the line 1--1 of Figure 2; Figure 8 is a View taken substantially on the line 8_8 of Figure 1; " - » The lower portion I2 of the carburetor is formed with laterally projecting aligned bosses 31 and 38 which are bored to receive a shaft 39, the shaft passing diametrically through the mixing passage. In the embodiment illustrated, the cen 70 tral portion of the- shaft 39 is provided with a slot which receives and accommodates a disk valve 4I which is secured in place by means of screws 42.' The valve 4_I serves to control 'the flow of mixture to an internal combustion engine with 75 which the device may be utilized. A projecting 49 serving to draw the split portions of the lever together so that it is caused to grip the shaft to hold the parts in adjusted position. Positioned intermediate the boss portion 35 and the lever 44 is a member 5I carried by the shaft 33 and held in 10 position thereon by means of a screw 52 which passes through a transverse bore in th'e lever lshaft 39 to hold the member to the shaft. Mem ber 5I is formed with an L-shaped projection 52’ which is adapted when the throttle is moved to wide open position to determinel the maximum ex tent of movement by its engagement with the web 53 _formed on the carburetor body. The lower portion of the projection 5I is bored and threaded to receive a screw 55, the end of the screw being adapted to engage a web portion .55 which deter mines the idling rposition of the engine by fixing the minimum throttle opening of the valve disk4I. A' coil spring 51 is interposed between the head of the screw 55 and the member 5I which exerts friction upon the screw to hold the latter in adjusted position. By regu’lating the .position of screw 55, a Vchange may be eßected in the idling speed of the engine by regulating the posi tion of the screw 55 with respect to the pad 30 portion 55 >formed on the body portion I2 which acts as stop means with the screw 55 to determine the “idle” position of the throttle valve. The up per extremity of the lever 44 is provided with an opening 45 adapted to receive linkage (not shown) for manipulating the throttle valve. 'The end of the shaft projecting through boss portion 31 re ceives an arm 6I) which is held in place by swaging or upsetting the extremity of the shaft. _The up per part II of the carburetor body is provided dû with a transversely extending bore which receives a shaft 5 I, the shaft extending across the air pas sage 52 and carries a choke valve 54 which is held in place on the shaft by means of screws 55. Po-sitioned at either side of the shaft 5I are small circular valves 55 of mushroom configuration which normally close openings 51 in the disk 54. Each disk is secured to a headed member 53 and surrounded by a comparatively weak coll spring ‘III4 which serves to maintain the valves 55 nor mally in' contact with the surface of disk 54 clos ing the openings 51. 'I'he purpose of the spring mounted valves 65 is to permit entrance of asmall amount of air immediately upon starting of the engine into the air passage of the carburetor when the choke valve 54 is in vclosed or substan tially closed position as the suction of the engine will overcome the slight pressure of the springs 1I to admit air into the passage. . . The‘ portion II\ of the> carburetor is provided with a vertically arranged chamber 12 as illus trated in Figure 4 which communicates with the air entrance passage through the medium of a tube 13. The chamber 12 .and tube 13 permit the equalization of pressure in the float bowl -chamber I5. Another purpœe of an. internal venting of the fuel chamber is that under cer tain conditions an air cleaner or dust eradicator connected to the air passage of the carburetor may become clogged,>a_n_d thus set up resistance. to the passage of air through the carburetor, and ' yet the pressure in the float bowl and the mixing passage is substantially equalized by means of the internal channel. - The portion of mixing passage >15 contained 75 9,114,970 in the bocLv -I8- ofthe carburetor incorporates a member or cage 18 illustrated particularly in Figure 9 which has a flanged annular portion 11 at its upper end and a pair of centrally aligned Venturi tubes 18 and- 18. The member 18 in the . embodiment illustrated is formed with a plurality of spaced, depending, triangular, integral por tions 8|, each of the portions 8|. having a pair of uniplanar surfaces 82, each surface forming 10 with a corresponding uniplanar surface of its adjacent projection a support for a ñexible mem ber or reed valve 84. In the embodiment illus 3 serves to properly pcsitionthe nozzle structure 88 by means of engagement with‘the enlarged portion 88 thereof. A portion of the bore 88 is threaded as at 81 to receive a barrel-like mem ber 88 which- is provided at its upper end withl a flange 88 and an annular recess |88. The member 88 is formed -with a central bore |82 ex tending partially through the member and ter minating in a restricted opening |88, which in turn communicates with an enlarged bore |84 in 10 the other end of the member 88, the innermost »portion of bore |84 being conical in conñguration trated, there are four projections 8| which form the supports vand valve seats for f9i1r equally 15 spaced reed valves or members 84. 'I‘hese valves 84 are secured at their uppermost extremities to the member 16 by means of screws 88 leaving the lower portions of the reeds in position to in its connection. with the restricted bore |88 as illustrated in Figure 13. 'I‘he member 88 is formed with two longitudinally extending, later be readily flexed by the decreased pressure grooves |81 and |88, the portions of member 88 20 coupled with the velocity of air passing through the carburetor. The venturi 18 is formed as an integral part of member 16, being supported by means of webs 86 connecting portions 8| integral ally spaced bores or channels |85 and l |86 ex tending entirely through the member 88. Mem ber 88 is also provided with circumferential spaced on either side of groove |81 being threadedas at 20 ||8 and |||- There is -also provided a compara tively small transverse channel ||2 leading from the recess |88 into the central .bore |82. The ly with the venturi 18. 'I‘he venturi 18'arranged groove |81 is in communication with the central 25 above and in axial alignment with venturi 18 bore |82 by means of transverse channel |86’. 25 is formed as an integral part of member 16 be ~The lower extremity of member 88 is formed ing supported by means of webs 81 connecting with a laterally extending kerf or slot | I4 adapted the venturi 18 with the venturi 18. The interior - to receive a suitable tool in order to >assemble the surface of the flanged portion 11 formed on member 88 into the threaded bore 86 of the car 30 member 16 is curved as illustrated at 88 in Fig buretor. Threaded into the extremity of the ures 4Í and 5, so that when the reeds 84 are bore 88 is a member ||5 which has a central flexed outwardly as illustrated in ÑFigures 5 and threaded bore ||6 adapted to receive a metering 6, they form in effect‘a third venturi 'resulting pin or valve ||1 having a needle shaped extremity in an increased air velocity at the depending ||8, the latter being adapted tov project into the 35 portions of the reeds. The >reed valves and sup restriction |88 in member 88. lThe member H5porting structure are preferably arranged lso isiprovided with a stuillng gland ||_8 so as to pre that the reeds-are equallyspaced from the axis of vent leakage of fuel from the chamber 86. The the venturis 18 andç18 so that substantially the metering pin ||1 is provided with a transversely same amount of , air passes on one side between extending _portion |28 serving as suitable ma 40 the venturis and a flexible reed as passes between nipulating means for adjusting the metering p_in the venturi and any of the other reed valves. to regulate the amount of fuel passing .to the main 'I'he reed valves are therefore in eiîect placed con or primary nozzle 8|; 'I'he space between the centric with the axis of the venturis 18 and 18 member ||5 and member 88 forms achamber so that the axis -of _these venturis is substantially |22 adapted to receive fuel from the float bowl 45 the vcentral axis of the air stream passing through 16 through a channel |28 as shown in Figures 3 the> carburetor. ' ’ and .14. »It is to be’noted that 'the channel lead 1n the embodnnent illustrated, the arrange-- ing to the secondary nozzle 82A is provided with a ment includes-primary andsecondary nozzles for restricted entrance |24 for a purpose to be here the injection offuel linto the mixing passage, inafter explained. The tubes or channels-leading 50 The nozzlestructure is _shown per -se in Figure to the nozzles 8| and 82 are in communicationby 10 and in _assembled relation in the carburetor in means of a transverse channel |25. 1 _ ¿ Figures 2 and 3. As illustrated, the arrangement - The arrangement of providing a mixture for comprises a member 88 generally rectangular idling of the engine will'now be described‘.-'2lît is in cross section and having a primary nozzle 8| 55 and 'a secondary nozzle 82 formed therein, the to bel noted that the groove orannularjcha'nnel |88 is filled with fuel from the float bowlfitbeing lower portion o_f the member 88 being circular in communication-therewith by means of open- ' and flanged as at 88. The extremities of vmem ber 88 adjacent the nozzles 8| and 82-are tapered ing ||2, passageway |82 ~and restricted opening or form an apex by the intersection of angularly the latter receiving its fuel direct from the float 5 . -. |88 which is in communication with chamber _I2-2, 60 arranged surfaces 84 as shown in Figures 10. and bowl by means of passage |28, The recess or an 60 »14 in such manner as to- virtually increase the ‘ .vnular channel |88 is in registration with horizon-> ' area of the nozzle outlet facilitating the flow of fuel. The nozzle structurel 88 »passes through an tal channel |28’ which is formed by drilling into the side of the carburetor body, the opening being opening in the side wall of the -carburetor body closed by means of »a plug |28 as illustrated in and through a slot 88 _in member 16. It is to ` Figures 8 and 15.V Thev channel |28' is in com-` , vvbe noted that the extremity of the primary jet f munication with a vertical channel |88 which is 8| terminates substantially at the' axis of the contained within a vertical boss- portion |3| illus - Venturi construction while the secondary jet 82 trated in Figure 1. 'I'he upper end of the channel terminates slightly out of alignment with the |38 is provided with a bushing |3|' having a re-' axis of the venturis, as particularly exempliñed stricted opening |82 which admits fuel to a small 70 in Figure 3, the purpose of- which will be here chamber |88, the latter -being a threaded bore inafter explained. i . ' in the side of the carburetor body and is closed ï lThe opening inthe side wall of the carburetor by means of a threaded member |84 having av which receives nozzle portion 88 terminates in a needle or metering pin |88 which projects into 75 cylindrical bore 88, the inner extremityof which an opening |86 Ias illustrated in Figure 8. The 4 2,114,970 threaded member |34 is provided with a knurled head portion |31 for adjusting the position of the needle |35 in the opening |36, a spring. |38 being interposed between the head |31 and the boss por tion on- the carburetor body to exert a degree of friction upon the threaded member so that the same will be frictionally held in adjusted position. 'I'he air supply for forming the.idling mixture is obtained from the interior of the main air pas 10 sage through the medium of a slot I4| contained in the side wall of the portion || of the carburetor in member |58 and a circular coil spring is in serted in the groove |62 and urges the piston leather outwardly into contact with the walls of the cylinder. The upper extremity of the piston rod |51 projects through an opening in a cross arm |54, the cross arm being riveted as at |65 to an actuating shaft |66 reciprocably mounted in a bore in a vertically positioned boss |61 formed in the float bowl chamber. The upper portion of the piston rod |51 is provided with an annular groove 10 (not shown) which receives a hairpin clip |56 so as body which registers with a vertical bore |42 in` to maintain a cooperative relationship between the the portion I8 of the carburetor body, this ar vcross arm |64 and the spring |15 in a manner to rangement being shown in detail in Figure 8. be hereinafter explained. The lower end of the 15 The chamber |33 in which the fuel and air are shaft |55 is bored to receive the end |68 of a link 15 brought together to form an idling mixture com |68, the link being pivotally connected `to the municates with one end cfa laterally extending shaft by means of a cotter pin |18. The lower channel |44 the other end ofthe channel being end of the link |58 is bentat right angles and 'in communication with a substantially vertical projects through an opening |1| formed in the 20 channel |45 as illustrated in Figure 6, there being end of the arm 68, the latter being flxedly secured a Abushing |41 at the entrance of channel |45 to the polygonal extremity |12 of the throttle having a comparatively small opening therein supporting shaft 38 as illustrated in Figures 1 acting as a restrictionto the flow _of fuel mix ' and 7. Interposed -between the disk |60 and the ture through channelïl46. The channel |45 in arm |54 and surrounding piston rod |51 is an body portion lli of the carburetor is in registra expansive coil spring |15 which serves to nor tion with a channel |48 contained in portion I2 mally urge the piston |6| away from the cross of the carburetor body which terminates in a - arm |54 and serves to cause a flow of fuel to an acceleratingjet or orifice in a manner herein chamber |48 formed by a bore in the side wall of the body portion I2, the chamber being closed after to be explained. bymeans of a Welsh plug |58. The chamber |4'8` 'I'he lower end of the cylinder |55 terminates 80 is in communication withv the main mixing pas in -a channel |16 which communicates with the sage through the carburetor by means of two float bowl by means of a channel |11 shown in openings |5| and |52, the opening |5I being Figures 4 and 14. The upper portion of the channel |15 is enlarged as at |18 and accommo smaller in diameter than opening |52, the ar 35 rangement of opening |52 being. such that when the throttle valve disk 4|'is in idling or nearly dates a ball check |18 which serves to close the channel |15 _when piston |6| is forced down- - closed'position, the peripheral edge of the valve vwardly but serves to admit the passage of fuel partially covers the opening |52. The idling mix from Athe float bowl through channels |16 andv Ature passes through orifice l5i, a further partial 40 opening of the throttle valve 4| causes the open ing |52 to supply additional fuel and air mixture from the chamber .|48 into the -main mixing ¿pas |11 into the well I 55 to iill the latter with fuel when the piston is moved upwardly on its return stroke. ~ Communicating with the lower portion of cyl sage until the velocity of the air p'assing through -' inder or accelerating well |55 is a transversely ‘ the main mixing passage has reached a suiiicient arranged channel | 8| which intercepts averti 45 value under the influence of the' acceleration of the engine to cause the main or primary jet 8| cal channel |82, (see Figures 6 and 7) the latter terminating in a slightly enlarged chamber |83 to discharge fuel into the main mixing passage. A in the upper portion of winch is positioned a The bushing |41l forming therestriction by means of an opening smaller than the channel |46 and 50 channel |44 is utilized to aid in breaking up the particles of fuel in the.idling mixture, thus fur ther atomizing the fuel to provide a better and more homogeneous idling mixture forl delivery from the oriñces |5| and |52. 'I’he screw |34 55 may be adjusted so that the needle |35. will con-,' bushing |84 having a channel |85 therethrough, a. ball check |85 being arranged in chamber |83, these channels being contained within body por tion I8 _of the carburetor. The channel |85 in bushing |84 is in registration with- a passage |81 at the entrance of which is interposed a iine mesh screen |88 for the purpose of'preventing foreign particles that may be present in the fuel from reaching the discharge orifice. A'1"he pas trol or regulate the amount of air admitted to the chamber |33 where it is mixed with fuel sage |81 communicates with a chamber |88 from channel |38 through restriction |32 to pro ' formed in the upper portion | | of the carburetor vide the fuel mixture to be supplied through body, the walls of which are threaded and receive 60 orifices |5| and |52 as above set forth. l ' a closure or plug |88 as illustrated in Figure 6. - It is desirable in a carburetor of this character . The side wall of the mixing passage of portion t'o incorporate means for `momentarily injecting additional fuel in’to the mixing passage when the internal combustion engine is accelerated. To 65 this end,~ there is- provided a cylindrical cham b_er. |55 formed adjacent the-float bowl l5 in x, which is reciprocably positioned a piston rod |51 having at its lower extremity a member |58 which i | of the >carburetor body is bored to receive a tubular member |8| which is pressedor otherwise secured in the bore in the'side wall oi’ the mix ing passage, the tube'A depending angularly and 65 having at its» extremity a small opening forming a restricted fueldischarge orifice |82, the orifice terminating adjacent a restricted .portion of the main mixingpassage, viz., at a point of high air velocity adjacent the flange 11 so that an effec 70 >and a washer |58 which is positioned on rod |51 ' tive vsuction is present serving to withdraw fuel is a piston |5| fabricated of leather or other suit from the orifice |82. Thus, when the engine is to able material. In order to cause the leather pis be accelerated the throttle is moved to an open po ton to remain in close contact with the walls of sition depressing shaft |66, cross arm |64, which 75 the chamber i 5_5, an annular groove |52 is formed compresses the spring |15 tending to urge the 75 is' snuglyfitted upon'a reduced portion |58 of 70 the rod |51. Interposed between member |58 l 5.. piston |0| downwardly. Under the loading of the pressure in the spring |15, the'piston moves downwardly forcing fuel from the‘chamber |55 through channelsv |0|, |02,- |00, |05, |01 and |9|, l0 >through opening |29 to the chamber |22 -thence past the metering pin ||0 through chan nel |02, e ||2 to the annular channel |00, thence through channels |20 and |00 to chamber thence through oriñce |92 and is discharged into - |30 where'it is mixed with air entering through the mixing passage to supply the added fuel nec the slot |0|, the mixture then passing through essary for accelerative movements of the inter chambers .|00 and |00 to the chamber |09„thence nal combustion engine. When the throttle*v is through the opening |5| into the mixing passage. moved toward closed position-the connection be In the idling position of 'the ,throttle valve, the tween the cross arm |00 and piston rod |51 causes fuel mixture is extruded- through the lowermost 10 the piston to be drawn upwardly, thereby with opening |5|. Upon slight partial opening of the. drawing fuel from the float bowl into chamber throttle, both of the orifices |5| and |52 deliver |55Dast the ball check |19.I ‘The ball check |00 fuel mixture to the mixing passage. As Í the serves to normally check the return of fuel in throttle is further opened the engine speed is in channels |0| and |02, also prevents air from en creased- and the suction increases in the mixing 15 tering the fuel chamber |55, so‘that'upon subse-- passage and the primary or main jet v9| begins quent accelerating movement of the throttle these to deliver fuel into the mixing passage atthe cen channels are already i‘llled with fuel so that prac tral axis-of the small venturi 19. At the' time the passage, tically instantaneous extrusion of fuel- through mainvjet 9| delivers fuel into the the oriilce |92 ‘takes place under the spring pres A the reedfvalves, due to air velocity and decreased sure exerted upon the piston |0| whenever slight pressure within the mixing passage will be caused downward movement of the cross arm |00 and to open slightly so as to permit an increased shaft |00 takes place by slight opening move amount of air to pass through the mixing passage ment` of the throttle. . r ' . and in this manner prevent an overenrichment of - To obtain full power at open or nearly open fuel mixture passing to the engine. As the speed throttle position it is desirable that the car of the engine increases, the suction increases and buretor deliver additional fuel to the mixing pas sage in excess of the amount which will pass through the primary or main jet 9| and the secondary jet 92. To obtain this result the car buretor of our invention is formed with a boss therefore the proportionate degree of opening of the reeds is increased to accommodate the flow -of air andl fuel through the Vmixing passages. During the operation of the engine at compara 30 ~tively high speed, in order to maintain a proper mixture ratio, the secondary jet 92 is caused t0 portion 200 `vertically bored to receive a -shaft 20|, thev latter being reciprocably mounted in the I come into operation and deliver additional fuel bore. The lower portion of shaft 20| is reduced into the mixing passage in order'to maintain a l in -size to form a tenon 202, which normally con substantially balanced mixture ratio of fuel to air. tacts with a ball check member 203 arranged in As the reeds open they assume a curved configura the upper end of. an enlarged bore orl chamber tion which they attain under the rapidv passage 204, the ball check 203 being heldin its upper of air as illustrated in Figure 4, which configura most position under the influence of an expan - tion provides -in effect a third‘venturi, thus ob-v 40 sive spring 205, the spring being held in place - taining a maximum flowof air through the open-, 40 and the lower entrance to the chamber being ing ail'orded by the ilexure of the reed valves and.` closed by means of a threaded plug 200. Ther at the same time maintaining a high air velocity. This type of carburetor _because of the variable I chamber 200 is in communication with a trans versely extending channel 201 which communi- ` effective-area of mixing passage makes possible cates with a channel 200 leading into the chamber the utilization of a single ~carburetor for various 45 formed by recess |01 in the fitting or member 90.. Diametrically opposed openings |00' permit the types and sizes of internal combustion engines as the flexible wall passage accommodates the vary fuel in recess |01 to flow into the main or pri ing volume of fuel- ~mixture required. mary jet 9|. » . Q v The operation of the accelerating well and - When the throttle has been moved to open or nearly open position, the cross arm |00 is thereby depressed and engages the upper extremity of the power jet have been hereinbefore explained. ` shaft 20| depressing- the latter, the tenon 202 ments may be made other than is herein dis closed, and the present disclosure is illustrative ' of which pushes the ball check m away from its seat and permits fuel to flow through channel |09 leading from' the float bowl into the chamber 200, channels201 and 200,’ recess |01, openings |00', thus supplying ‘additional fuel direct from the float bowl through the above mentioned channels 50 It is apparent that, within the scope of the in-- vention modifications and different arrange merely, the invention comprehending all varia tions’ thereof. - A - = What we claim'isz. . . 1. In a carburetor,` in -combination, a- mixing passage; `a plurality of axiallyaligned venturls substantially centrally arranged in said passage;' 60 ment in effect by-passes the fuel channel con a fuel discharge nozzle terminating substantially trolled'by the metering pin` ||0 so that when,Á in alignment with the axis of said venturis, the ~ power is needed with the throttle toward well extremity of the nozzle being an apex formed by open position, the same is supplied in the form of intercepting v angularly arranged surfaces;' a ' additional fuel to the main jet thi ough the plurality of flexible reed valves positioned ad 65 arrangement above described. When the -throttle jacent said venturis and >substantially equally is only partially opened, the by-pass of fuel from spaced from the axis of said venturis, said valves the float bowl direct to the main nozzle is closed adapted to flex to permit additional amount of direct to the main nozzle 9|. Such an arrange as soon as the ball check 200 is seated in chamber 204 under the inñuence of the spring 205. ' „The‘general operation of the carburetor of our> ' invention is as follows: At low or idling speeds with the throttle in substantially closed or idling position thefuel for the idling mixture passes from the fluid chamber air to pass throughsaid-mixlng passage. ' 2. In a carburetor, in combination, Aa. mixing 70 passage; a plurality of axially aligned concentric venturis arranged in said passage; a plurality >of ’ flexible reed valves positioned adjacent said ven turis and substantially equally spaced from the axis» of said venturis, said valves normally re l 6 2,114,970 stricting the flow of air around said venturis, said valves adapted to flex to permit additional amount of air to pass around said venturis through said mixing passage. 3. In a carburetor, a mixing passage, a member positioned in said passage; a plurality of venturis positioned in said mixing passage *and supported on said member, said venturis having substantial ly a common- axis; and a plurality of converging 10 flexible reeds positioned adjacent to and substan tially equally spaced from the axis of said ven turis, said reeds being secured to said member. 9. In a carburetor, in combination, a mixing passage; a frame positioned in said mixing pas sage; a venturi substantially centrally positioned in said mixing passage supported by said frame';,¿'v a plurality of flexible valves carried by said fram‘e‘` and arranged outside of said venturi, said valvesr being spaced equally from said axis of said ven turi; primary and secondary fuel discharge noz zles projecting through said frame and terminat ing adjacent said Venturi axis; and means for regulating the flow of fuel to said primary nozzle. 1i). In a carburetor, in combination, a fuel sup 4. In a carburetor, in combination, a mixing _ ply chamber; a mixing passage; a removable passage; a plurality of venturis substantially cen 15' trally positioned in said mixing passage; a plural frame structure normally supported in said mix ing passage; said frame structure including a 15 -ity of reed valves positioned exteriorly of said plurality of aligned Venturi tubes of diiferent venturis and substantially equidistant from the sizes; a plurality of fuel discharge nozzles ter central of one of said venturis; and a fuel eject minating substantially adjacent the axis of said\ ing nozzle angularly positioned with respect to venturis, said fuel nozzles receiving fuel from the fuel supply in said chamber; said frame structure 20 including a plurality of sets of converging uni planar surfaces spaced about the axis of said venturis; and a plurality of flexible reed valves adapted to contact with said sets of uniplanar surfaces for regulating the amount of air passing through said mixing passage. 11. In a carburetor, in combination, a body formed of at least three connected sections; a plurality of heat resisting elements interposed between two sections; a fuel supply chamber ad 30 jacent to said central sections, said sections hav ing hollow aligned portions forming a mixing passage; a tube communicating between said fuel supply chamber and an upper section of said carburetor body whereby said fuel supply cham ber is vented from said mixing passage; an air regulating valve journalled in the upper section of said carburetor body; a venturi positioned in an intermediate section of said carburetor body; a fuel nozzle adaptedì to discharge fuel adjacent 40 said venturi, said nozzle adapted to receive fuel from said fuel’chamber; a plurality of flexible valves positioned about the axis of said venturi and adapted to flex; and a throttle valve jour the axis of one of said venturis and terminating adjacent thereto. » 5. In a carburetor, in combination, a mixing passage; a plurality of axially aligned venturis in said passage; a plurality of flexible reed valves 25 positioned surrounding said venturis and equidis tant from the axis of said venturis, the relatively movable ends of said valves terminating at the extremity of one of said venturis, said valves nor mally restricting the ñow of air to around said .30. `venturis, said valves adapted to flex to permit additional air to pass through said mixing pas sage. - _ 6. In _a carburetorin combination a fuel -sup ply chamber; av mixing passage; a removable 35 member normally supported in said mixing pas sage, said member including a plurality of axially aligned Venturi tubes of different sizes; a plural ity of fuel discharge nozzles terminating ad . jacent the axis of said venturis; a plurality of 40 converging surfaces spaced about the axis of said venturis'carried by said removable member; and a plurality of flexible reed valves normally con tacting with said converging surfaces for re stricting the .amount of air passing through said mixing passage. n y, 7. In a. carburetor, in combination, a mixing passage; ‘a venturi positioned in said mixing pas sage; a second venturi into which said ñrst ven turi delivers; a plurality of flexible plates sur-V 50 rounding said venturls; a plurality of fuel dis 45 nalled in a section of said carburetor body. 12. In a carburetor in combination of a mixing passage; means for delivery of fuel into said mix ing passage comprising a primary and second ary unitary jet construction including a member having a substantially rectangular cross section., 50 charge nozzles terminating in said mixing pas said member terminating at one extremity in a sage; one of said nozzles terminating. in sub flanged portion; a pair of juxtapositioned chan nels in said member, the extremities of said chan Anels opposite the flanged end of said member forming >fuel delivery outlets for said mixing 55 stantial alignment with 4the axis of said venturis and means for regulating `the flow of fuel to one of said nozzles. » 8. An air controlling means for a carburetor mixing passage including in combination a mem ber having a skeleton structure formed with con- . verging portions projecting in the direction of the central axis of said mixing passage; -a venturi supported by portions of said member within said converging portions; a plurality of flexible Walls secured at their upper extremities to said skele _' ton structure, each of said walls adapted to en gage some of said converging portions; said ilex ible walls adapted to be flexed outwardly Where by an increased amount of air is enabled to pass around said venturi. passage. . O 13. In a carburetor, a mixing passage; a mem ber arranged in said mixing passage; a venturi arranged in said mixing passage and integrally formed with said member; a plurality of con vergingly arranged flexible reed valves positioned adjacent to andvsubstantially equally spaced from the axis of -said venturi, one end of each of said re'ed valves being ñxedly secured to said member i the other end of -each of said reed valves termi nating at the extremity of said venturi. EARL A.' RULLISON. HOWARD B. SIMMONS.