US1928829A - Carburetor - Google Patents

Description

Oct. 3, 1933. A. DlC-KERSON l 1,928,829

g] Mambo@ Oct. 3, 1933. A- D|CKER5ON 1,928,829

CARBURETOR Filed Sept. 14, 1931 2 SheelLS---Sheeeil 2 Patented Oct. 3, 1933 l UNITED STATES PATENT oFFicE CARBURETOR Y Arthur Dickerson, Logan,` Utah 4implication September 14, 1931 Serial No. 562,683

5 Claims. (Cl. 261-64) My invention relates to carburetors and has the engine by'stud bolts. Theair port opening for its object to'provide a new `and efficient carinto the casing is made by ran angled opening 'I buretor for providing the proper mixture of fuel formed from the bottom open end of the casing and air for theengine. on one side to near the .top end on the opposite 5 A further object is to provide a simplified carside, making the air opening '7Y an oval in shape. 60 buretor with few parts, few moving parts, and The air control valve8 is made ovidal inshape with means to control the opening of the air in- Vtoriit the opening 'I and the valve is pivoted in let valve by a fuel filled bucket. the opening'bya' pin 9 being passed through a A still "further object is to provide a carhole 10, which hole is formed on `the valve 8,

10 buretor which will be economical to use, giving dividing the valve intov two portions with the .65

greaterzmileage and more power, per 'gallon of upper portion about twice as large asv the lower `fuel, y portion The pin 9 is passed'intoj the walls of A still further object is to provide a foolproof the casing to support the valve therein. An carburetor `which hasfixed jets that cannot be idling opening l11 is cutaway from the bottom 15 tampered with and which has an air chamberto of the air valve to allowair to pass. therethrough .70 cushion the feed of fuel from the float chamber over the face ofthejfuel port 12. The fuel port to the. venturi of the device. 12' is formed on thebackside of the bore of the These objects AI accomplish with the device 'casing y4 and is in open connection with an air illustrated inV .the accompanying drawings inL chamber 13 and an enlarged chamber 14 on the which similar numerals and letters of reference bottom end thereof both chambers formed ver- 'I5 indicate like parts throughout the several views VIJllyfirl a-bOSS 15 O11 therbak Outer Side Ofthe i' .and as described in the 'specification `forming a casing 4. Thelbottom end of the fuel port champarti of this 4application and pointed out in the ber 14 is the threaded hole 3V to receive the top appended Claimsk Y end ofthe fuel jet D.V An intermediate speed port In the drawings in which I have shown the best 16. is bored from the chamber to the air space F $0 t and most preferredmanner ofl building my in-V below the level of the fuel Chamber 14, and the vention j air control valve and a high speedA port 17 is bored Figure 1 is a vertical diametrical section of the through the same wall of the, chamberabove the carburetor, top side of the cover Q 'Ihetwo Vports 16 and Figure 2 is a plan viewA of the cover for the 17 act. in, two waysgflrstv as air ports into the 86 float chamber "and the adjacent bucket chamber. chamber 14,., and then asV fuel ports therefrom; Figure 3 is a side/elevation of the carburetor for as4V the motorfis running at low speeds the with. portions cut away to. show the air valve ports allow air to enter into the chamber 14 and opened to extreme position and the bucket. raised mix withv the fuel being drawn therethrough, and

to the highest position.V The arrows a indicate as the motoris accelerated the suction is in- ;90 the travel of the partially mixed fuel and air creased 4and thevalve 8 opened farther, thereby from around the air valve; 'the arrows bj the kdrawing, fuel' out throughzthe Jets. vThe fuel jet `fuel from the fuel jet chamber; the arrow fc" D is made of la shaft 19having the bottom end shows the air entering around the bottom'of the ,formed into a hexagonal head 20 and having the 40 air valve and the arrows e show'the travel of .balance of the shaftv tubular with a bore 21 95 air over the top of the air valve. therein, and having ports 22 connecting the bore Figure 4 is aplan view of the device withA the 2l with the fuel, inthe float chamber B. A plug throttle valve removed and showing the position 23 having a iet Opening therein is then screwed of the` air-.valve when in full open position. intofthe top Vend of thebore 21 to, limit themaxi- Y In the'drawingsl have shown the 'carburetor mum flow of fuel through the bore into the -100 as made .of three pieces, the mixingl chamber chamber 14. `.A float 25 isipivoted in the cham- A, the float. chamber B 'and the cover C, and all berB'and regulates. the needle valve 26, con* three are secured together by thefuel jet D,.being trolling the level of fuel in the chamber and the `screwed up through the bottom of the oat chamfuel allowed to enter the chamber through the ber through a hole 1, through Va hole 2, in the inlet 27. 1 105 cover C and into a threaded fuel hole. 3 in the Adjacent the. chamber B AI provide a small wall of the casing .4 of the venturi A. The mixe cylindrical chamber 28 closedby a protruding ing chamber A is made of a cylindrical casing 4, sectionCI of the cover C and in which chamber having a flange formed onthe top side by which a bucket 291s carried, the bucket being of smaller the casing is secured to the intake manifold of diameter than the' chamber and free tomovezllo up and down in the said chamber. A port connects the chamber 28 with the float chamber B to maintain the same level in both chambers. The bucket 29 is provided with a centrally positioned vertical rod 31 which rod has the top end secured pivotally to a lever 32 by a pin 31a, which lever 32 is screwed into the front side of the valve 8 and any movement of the valve 8 is transmitted to the lever, the rod and to the bucket. The bottom of the bucket is perforated at 33 around the rod 31 to allow fuel to enter the bucket through the bottom thereof and a flap valveY 34 is carried around the rod, adapted to close theY perforation 33 and allow fuel to enter the bucket and allow the bucket to move more freely in'the chamber when in the downward movement, but

A sure.

offering more resistance to the upward movement of the bucket, thereby restraining the movement of the valve 8, preventing excessivev movementY .of `the valve 8, due to sudden increase or decrease ofsuction from the engine; the full bucket offers more resistance to the opening movement of the./'alve.8, but allows it to close instantly when the -suction has been taken away or the throttle v'alve closed. The cover C1 has a hole therethrough large enough to allow for all motions ofvthe'rod 31. A plate C2 is carried Yaround the rod 31 above the cover C1 and resting thereon to prevent any foreign material from entering the chamber 28. A` link may be used connecting the rod 31 and the lever 32 ifdesired.

An additional feature of the device is an accelerating lpipe 36 which is secured into the casing 4 above the valve 8 and has the lower end passed down through the cover C1 into the chamber 28 and the bottom of the pipe is just above the level of the fuel in the two chambers B and kinto and'such fuel will be drawn through the pipe into the engine inv nearly a raw state giving the necessary extra fuel forquick acceleration, and

las the fuel in the bucket is drawn oif, the mix- -ture in the chamber A will be thinned'out to the Yproper proportion required.

To provide a choke for the carburetor I attach a collar 40 to `a helical spring 41 and Athe collar is provided with a bore in one end into which the end of the choke Wire 42 is placed and secured by the set screw 43. `The other end of the spring `is passed through a hole 44 in th'evalve 8 and the end of the spring is straightened out to form a ybar 45 with the end 45a turned to vprevent thebar from being pulled out ofthe valve. .Thefchoke wire is supported by a collar 46 supported from the bolt 6A by a bracket 5 7.r` The barr 45 yallows the valve 8 to operate freely under normalconditions when the choke Wire is pushed in, but when the choke. wire is pulled out the bar engages the end 45a withI the inner side of the valve 8 holding the valve normally closed by the spring pres- When the car is started in this position the valve 8 must open against the tension of the spring and the tension may bevaried bypulling run even after warm withoutthechoke flooding Vthe motor and killingV it as the valve 8 Will be A8 in the opening '7.

open sufficient to make the engine run, but the mixture ywould be richer than desired, so the operator may push the choke rod into the desired position for smoothest running of the motor at the leanest mixture.

The operation of my device is as follows:

To start the motor the choke rod is pulled out and the tension of the spring will close the valve The motor is then rotated and the suction thus created partially opens the valve 8 commensurately with the spring tension and the suction of the motor. Fuel is drawn through the jet opening of the plug 23 into the chamber 14 and mixed with air entering through the ports 16 and 1'7 and the mixture is drawn outthrough the port 12 into the mixing chamber-A where it is mixed with the air entering i around the valve 8 and thence to the motor.

The suction of air around the port 12 tends to vaporize the fuel more completely as the air is being sucked through the small opening 11 and such suction creates sufficient friction to aid in the vaporization.

The choke lever is then pushed in to the proper I positionfor the best mixture in running the motor depending upon weather conditions.` To

place the air through the port 17 is neutralized and fuel is drawn therefrom into the mixing chamber in a like manner. The fuel thus entering through the ports 16 and 17 is at oncemixed with airA and the position of the lower end of the valve 8 causes complete breaking up of the fuel into vapors and the air entering over the top open end of the valve is mixed with the vapors to give the proper lean mixture for best running of the motor under high speed. All of the fuel for the Ymotor must be drawn through the jet opening of the plug 23 regardless of the speed of the motor', the amount of acceleration, and the position of thevalve 8.

When the motor is being accelerated, and the valveY 8 is drawn open by the suction of the motor, more fuel is introduced into the device through Athe pipe 36 as the bucket 29 will be raised by the valve 8 to introduce fuel into thel end of the jet pipe and the fuel thus introduced will cover all heavy fueling required for quick acceleration. As the suction continues the fuel drains from over the end of the pipe 36 and the motormixture smooths out to a lean mixture, giving the power required.

With each acceleration of the motor'the'valve 8'is opened and the bucket raised thereby introducing a separate supply of fuel into the device yfor quicker acceleration lthan would otherwise be,

possible.`

The air chamber 13 cushions the effect of the fuel being drawn up through the plug 23 into the chamber 14 and aids in the mixing of the fuels in the chamber 14 when the low speed port is being used, and provides a more constant flow of fuel from the chamber 14.

Having thus described my invention I desire to secure by Letters Patent and claim:

, .1. In a'carburetor of the class described the combination of a cylindrical mixing chamber fu. im)

the port16 upon further acceleration into the Y mixing chamber and as further acceleration takes having the lower end cut diagonally to forman air opening thereinto; a float chamber mounted under said chamber having a cover thereover; a boss on the back side of said chamber forming an air chamber therein; a fuel jet having a head on the lower end thereof, passed through said float chamber in open connection therewith and screwed into said air chamber, securing the mixing chamber, the cover and the oat chamber together, with a plug having a jet opening therein in the top end of said fuel jet; ports through the wall of said air chamber into the cylindrical bore of the mixing chamber; an air control valve pivotally mounted in the air opening of said mixing chamber with the bottom end in alignment with the top port shutting out the lower port; a cylindrical bucket chamber adjacent the oat chamber in open connection therewith and covered by a portion of said cover; a bucket of smaller diameter than said chamber carried therein; ports through the bottom of said bucket adapted to be closed by a floating plate; a vertical shaft in said bucket; a lever connected with the free endof said shaft'and having the `other end screwed into said air valve; a spring for choking and normally holding the air valve closed, said spring having lthe end formed into a bar to allow the air valve to'open thereon when the choke is not needed, but -to hold the valve normally closed against spring pressure when needed to start the motor under cold conditions; and a choke wire secured to the free end of said spring.

2. In a carburetor the combination of a cylindrical mixing chamber superimposed over a float chamber and a bucket chamber; an air port into said mixing chamber; a valve to control the opening of said port by the suction of the motor; a bucket carried in said bucket chamber having a valve in the bottom thereof to close when the bucket is raised to offer more resistance to the valve when opening, said resistance lessening as the amount of fluid in the bucket; choke means. Y

to add tension to the opening of the valve when desired; and ports to direct fuel into the mixing chamber at the lower end of said valve from a source of fuel supply.

4. Ina carburetor the combination of a mixing chamber having a diagonal opening therein above the float chamber, said opening being closed by a pivoted air valve; means to control the flow of fuel through the mixing chamber; an air chamber formed on the back side of said mixing chamber; a jet to introduce fuel into said air chamber; a port to direct fuel into the mixing chamber at the lower end of said air valve; and other ports to direct air into said air chamber below said port, when running at low speed, and to draw fuel from said chamber when the speed is increased.

5. In a carburetor the combination of a mixing chamber having an ovidal opening thereinto closed by an air valve; a fluid chamber adjacent the float chamber; a bucket mounted in said fluid chamber; a lever connecting said bucket to said air valve; a fuel jet from said fluid chamber' into the mixing chamber above the air valve, with the level of the bottom of the'fuel jet just above the level of the fuel in the bucket to provide extra fuel in the mixing chamber when the bucket is raised over the end of the fuel jet by the extra opening of the air valve when accelerating.

ARTHUR VDICKERSON.

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