US2594344A - Carburetor - Google Patents

Description

Ap 1952 A. c. POTHIER ,5

CARBURETOR Filed March 20, 1946 Y7IIIIIIIIIIJ /L I' I I k,

/f 1/0 I INVENTOR.

ATTORNEYS.

Patented Apr. 29, 1952 UNITE STATE-S OFF-I CJE CARBURETOR' ArmandQ. Pothier, Woonsocket, R41.

Application March 20, 1946, Serial No. 655,836

3.:Glaims'. (01.,261-44),

This inventionrelates to a carburetor-for an internal combustion engine.

One ofthe objects of this-invention is to "provide simultaneous controls fortheairconduit and the fuel conduit which may be operated so that the desired'mixture of air and'fuel-may. be maintained in adesired proportion.

Another object'of'this'invention is to provide conduits-which cause the fluidpassing through themto mix together w-ith-a valve in the airy conduit and a valvein the=fuel conduit and to simul-. taneously control the movement of' these valves toward and from open andclosed position.

Another object ofthis invention is to concentrically arrange thefuel and aircontrol valves so that both may be operatedsimultaneously by a rotary motion.-

A-more specific objectof theinvention is to provide a relative adjustment between thefueland air-control valves so that even though'these may be operable simultaneously, the range through which one operates with reference to the other may be-varied.

With these and other objects, in view, the invention consists ofcertain novel features of construction, as- Wi11"be more fully described and particularly pointed out in the appended claims.

In the accompanying drawings:

Fig. 1 is an elevation illustrating thecarburetor with itsreservoir of fuel;

Fig. 2 isa top plan .view of the structureshown in Fig. 1;

Fig. 3 iszasection onsubstantially line,;3i 3 of Fig; 1, illustrating the air control valvein; one position;

Fig. 4 is.-a..fragmental deta-ilof'the showing; in Fig. 3 with the air control valve shown in closed position;

Fig. 5 is a sectional view on substantially line 5--5 of Fig. 2;

Fig. 6 is a section on line 6-6 of Fig. 5;

Fig. 7 is an elevation of the air control valve shown by itself.

In proceeding with this invention, I construct a fuel supply conduit to extend across the longitudinal extent of an air supply conduit with an opening in the fuel supply conduit at substantially the axial line of the air conduit. A needle valve is utilized to control the amount of passage permitted for fuel through this openin and threaded means are provided for axially moving this needle valve. In order to control the air conduit, I have provided a valve which is concentrically arranged with and has bearing upon the fuel conduit and is provided with a bore substantially the size of: the. inner diameter of the air conduit, this .valvebeing so arranged. that. it

j, maybe rota-tedto axially. align this bore withthe axis of' the. conduit or to be: rotatedacross this conduitto-shutioff thesupply ofair. Ihave arranged that thesevalves are so connected that the:rotary motion ofone is transmitted to the otherso that both valves are actuated toward have-provided astop withlimiting arms so that control the proper opening or closing of. the valves.- The arrangement is also such that the needlevalve may beadjusted independently of the air-control valve so that the relative opening andiclosing operation may be through different ranges.

With reference to the drawings, I0 designates a fuel-reservoirwhich-in-this instance is designed to carrygasoline-or some-vaporous fuel to be mixed with-air that the proper combustion may be had.

Aicap l l'-is removably positioned'upon thisreservoirby set-screw- [2: This can threadingly receives afuel supply conduit: M which extends by means ofcoupling I 5 andpipe l 6 downwardly to, the lower portion of: the reservoir. This conduit isthreadediinto &" bOSS'|1 on the cover H andjheld in position therein bycheck nut I 8. This conduit also threadingly extends into a boss I9; on an air supply conduitin having a bore 21 throughwhich air-passes. A nut 22 serves as a check-nut forholdingthethreadedconduit I4 in the boss l9,-of -t-he air-conduit.

Opposite, the boss Iil'- there is also; provided ZJHOthBI bOSSZQ and acylindrical bore 24-extends throughthebosszsand into theboss l9 providing a cylindrical" opening fora valve 25 whichhas a central bore 26 to have bearing upon the fuel conduit l4 and to be rotatable about the same concentrically therewith. This valve 25 is provided with a bore 21 which is of a size substantially the size of the inner diameter 2| of the air conduit '20 and this valve 25 may be rotated from the open position shown in Fig. 3 to the closed position shown in Fig. 4. Its bore 21 will be aligned with the air conduit 2| when in the open position shown in Fig. 3 while its bore 21 will be substantially across or laterally of the conduit 2| when in the position shown in Fig. 4. This valve has the bore 21 spread out somewhat from a. true circle by means of a reamer which has been passed through the bore at an angle of substantially 15 degrees to the axis of the bore so as to provide enlarged portions 28 and 29 at the opposite edges of the bore, as shown in Fig. 4,

so that when the valve is in the idling position shown in Fig. 4, there still will be an opportunity for air to pass through the valve, serving as the equivalent of an idling jet.

The valve 25 is provided with a collar 30 which surrounds the fuel conduit l4 and upon which collar there is mounted a sleeve 3| which is fixed thereto by means of a set screw 32 extending through the sleeve and engaging the collar 30. Thus as this sleeve is rotated the valve 25 will also be rotated with it. The sleeve 3| is rotated by means of an arm 33 which is fixed thereto and extends radially outwardly therefrom and is provided with an opening 34 in which a rod is located for movement of the arm 33 from the full line position shown in Fig. 2 to the dotted line position shown in this figure. A hold down screw 35 for cover 35 protrudes upwardly and may be either an enlarged solid head or a spacer under a normal head and an abutment arm 36 is provided on the sleeve to engage one side of this screw 35 to act as a stop and limit the rotary movement of the sleeve in a counterclockwise direction as viewed in Fig. 2 while another arm 31 extends from this sleeve and is provided with a screw 38 which may have its end adjusted and held in adjusted position by anut 39 to engage the other side of the screw 35 and thus limit the rotary movement of the sleeve in the'other direction. Thus I may arrange that the extremes of the position of the bore 21' will be either that shown in Fig. 3 or that shown in Fig. 4. I

An opening 42 is provided in the fuel conduit I4 so that as air rushes across this opening an aspirator action is provided, drawing fuel up through the fuel conduit andcausing it to mix with the air which passes through the conduit 2|. In order that the opening 40 may be more or less free, I have provided a needle valve 4| having a pointed end 42 which extends across-the opening 40 and as I draw the conical end 42 further up the inner portion of the conduit M, a greater opening is provided, whereas if this needle valve moves downwardly, the opening becomesmore closed. This needle valve 4| has a threaded portion 43 to engage the upper threaded interior of the conduit l4 while at its upper end this valve is provided with a head 44 in which there is fixed a collar 45 which has a series of radial splits 46 therein to provide resilient portions 4'! (see Fig. 6) which will expand into sufficiently firm frictional engagement with the bore 48 of the sleeve 3|. The frictional fit of these parts will be such that rotation of the sleeve will also impart rotary motion to the needle valve 4| and thus cause it to move axially longitudinally of the conduit M to open or close the openin 40 as the air control valve is moved from open to closed position. If I wish to have the range of movement varied from one extent to another along the conical portion 42, it is merely necessary for me to engage the head 44 and rotate this needle valve with reference to the sleeve by applying suificient torsion to overcome the friction in order to accomplish this result.

By the above arrangement, it will appear that the two valves are operated simultaneously and through relative adjustment of these valves the particular range of movement over which the valve operate may be adjusted.

I claim:

1. A carburetor comprising an air conduit, a fuel conduit extending across the axis of said air conduit at substantially right angles thereto and of a size substantially smaller than the air conduit to permit the passage of air around the fuel conduit from both sides, said fuel conduit having a radial opening into said air conduit at a location in said fuel conduit no greater than ninety degrees from the direction of the leaving air stream when taken' in a plane at right angles to the axis of the fuel conduit and a valve comprising a pin threadedly engaging and extending axially of the fuel conduit and of the same diameter as the conduit and having a conical end to extend across said opening an air valve concentric with said pin to control the flow through the air conduit, means to rotate said air valve and means including a split collar frictionally connecting said pin and air valve to rotate the pin in its threaded opening simultaneously with the rotation of the air valve and thereby axially adjust said conical end across said radial opening.

2. A carburetor as in claim 1 wherein said opening is also midway of the air stream in the direction of the axis of the fuel conduit.

3. A carburetor as in claim 1 wherein said fuel conduit has a cylindrical outer surface.

ARMAND C. POTHIER.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 795,357 Maxwell July 25, 1905 890,099 Richardson June 8, 1908 1,129,129 Shakespeare et a1. Feb. 23, 1915 1,611,347 Hartwell Dec. 21, 1926 1,742,429 Walker Jan. 7, 1930 1,795,685 Stehle Mar. 10, 1931

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