US1572968A - Carburetor - Google Patents

Description

W. SCHMlD Feb. 16 1926.

. CARBURETOR Filed August 12, 1921 2 Sheets-Sheet 1 Feb. 16 1926. 1,572,968

. w SCHMID CARBURETOR Filed August 12-; 1921 2 Sheets-Sheet 2 Patented Feb. 1 5, 1.2925.

isizaete UNITED STATES PATENT OFFICE.

"WILLIAM SCHMID, OF BROL TSON, MICHIGAN.

CARBURETOR.

Application filed August 12, 1921. Serial No, 491,657;

To all whom it may concern:

Be it known that I, VVILLIAM Scrum), a

citizen of the United States of America, residing at Bronson, in the county of Branch and State of Michigan, have invented certain new and useful Improvementsin arburctoi's, of which the following is a specification, reference being bad therein to the accompanying drawings.

This invention relates to carburetors, and my invention includes two forms of carburotors, one of which may be attached to the side of an engine block to communicate with the cylinders thereof, and the other form of carburetor may be connected to the usual intake manifold of an internal coinbustion engine. In either the vertical or horizontal types practically the same novel features are embodied for controlling the admixture of gas and air, and while the carburetor has been especially designed. for

utilizing gasolineas a fuel, it may be used for atoinizing kerosene or other-fuels. A

The primary object of my invention is to provide a carburetor, wherein the throttles, valves and other controllingdevices are 10-- catedaxially of the carburetor and themajority of said controlling devices made of pressed sheet metal, thus reducing the weight of the carburetor and the cost of producing the same.

Another object of this invention is to provide a carburetor including a sleeve air throttle articulated with a tube for move incnt in synchronism, and associated with the tube is an adjustable choke member which, prior to constant use of the carburet or, may be adjusted to provide a lean or rich adi'nixture of gas and air, particularly for idling and starting purposes of an .en nine.

The above that may be are a few of tlie'inany objects attained by my invention and in describing the two forms of carburetors,

it is to be understood that the construction and arrangement of parts, in either form of ci'irburetor, may be changed without departing from the spirit of the invention, as defined by the appended claim.

Reference will nowbe had o the ings, wherein Figure 1 is a vertical sectional View of one form of carburetor; v

, Fig. 2 is ahorizontal sectional view, one sinallerjscale taken on drawthe Il -II of- Fig. 3 and its actuating member, and

Fig. 4 is a vertical longitudinal sectional view of another form of carburetor.

' Reference will first be had to Figs. 1 to 3 inclusive showing what may be considered as the vertical type of carburetor, and the reference numeral 1 denotes a float chamber having a side Wall thereof provided with a fuel inlet connection 2 adapted to coini' iunicate with a tuel tank and receive fueltherefrom by gravity. The connection 2 serves as a valve body for a needle valve 3 and adjacent said needle valve is a pivoted float arm 4 provided with a conventional form of float 5, said float and float arm controlling the needle valve 8. The valve 3 may be opened by pressure of gasoline or y i other fuel against the needle of said valve and after a predetermined quantity of fuel is accumulated within the float chamber the float arm 4 closes the needle valve 3 to prevent flooding of the float chamber.

On top of the float chamber 1 is a cover 6 provided with a central depending nozzle chamber 7 terminating in a stem 8 which has a threaded portion 9. The nozzle chamber 7 1 and its stem 8 correspond in depthto the float chamber 1 and the threaded portion 9 extends through an opening- 1.0 in the bottom wall of the chamber 1 and is provided with a nut 11, said nut clamping the bottom wall of the float chamber against thestem 8 and the upper edges of said float chamber against the cover 6. I

The nozzle chamber 7 is of inverted coni- "cal shape, that is, it tapers inwardly from is a plan of asleeve air throttle.

the cover, 6 to the stem 8 and axially of the V stem a nozzle 12 communicating with a lateral passage 13 in said stein, said lateral passage communicating with thefloat chaniher 1. and permitting fuel in the nozzle to assume the same level as fuel in the float chamber; The nozzle 12 is tubijilar, to serve as a guide and the upper end of the nozzle has a? single small oi'iticcl-t.

In the stem 8 is a drain passage 15 permitting-any fuel that may enter the bottom of the chamber"? to drain from" the carburetor.

v The upper face, of the cover, 6 'hasaii annular flange 16' about the open end of a nozzle chamber 7 and fitted over said flange is a cylindrical air intake member and throttle seat 17 preferablv made of pressed sheet lit) metal. "The airintakemember .17 has its 7 if sleeve is a fixture within the nozzle chamher and for .any air-to enter said sleeve it is necesary tor the air to pass through the openings 18, downwardly urthe nozzle chamber T and then into the lower end of the sleeve.

Secured to the cover 6 byscrews or other fastening means are the apertured inwardly projectinglugs 2d of a cylindrical carburetor body said body being fitted on the cover 6 and cooperating with-the float chamber 1 in providing a cylindrical carburetor structure. Theside wall of the carburetor b dy 1 has a large air intakecon nection 26 andthe top wall of the carburetor body has openings 27 to accommodate tastening means by which the carburetor body may be connected to the intake manifold of an internal combustion.engine. In addition to the openings 27 there is .a large central opening 28 adapted-to communicate with the intake manifold so that fuel may pass .trom the carburetor .to the engme. Depending from the top wall otthe carburetor is a guide for a sleeve air tlurottleZ-BO which has its upper end sliding in the guide 29.

The lower-end of the sleeve .air throttle is adapted to eithercomnfiunicate solely with the tapered portion. 21 or the air intake member 1701' with said tapered portion .and the interior of the carlmretor-body25. The sleeve air throttle ispreterably made of sheet metal and has its lower end rolled, as at 31, so as to seat on the upper edge of the air intake member and throttleseat 17. lVhen 7 so seated the sleeve air throttle cannot .re-

will hereinafter appear.

7 point.

Ceive air direct from theair intake connection 26, but may receive air indirectly, as

The sheet metal sleeve air throttle is formed with a flange intermediate its ends and engaging said flange. at diametrically opposed points are the forked heads .ot' a i set of arms ill mounted on a rock shaft exter .w transversely of the carburetor body 25. One end of the rock shaft 35 may have acrank 36 for suitableconnections so that the sleeve air throttleBOnray be raised and lowered in its guide 29 from a remote Mounted 'in the flange .32 as Shown in :Fig. 1 are t e eeds of radially disposed arms of a spider 8Z'w1th1nthe sleeve airfthrottle 30 at movement in synchrQn-ism therewith and s ss. tlt sri a the carburetor body 20 fastening means, is the upper tlPGi'ltllLtl cud .39of a. tube 4.0 which extends axially ot the sleeve 22 and is slidable on the nozzle 12. The tube 40 has its outer wall tapered inwardly from a middle portion of the tube to the ends thereof, the upper inwardly tapered end not interfering with passage of air from the sleeve 22, and the lower inwardly tapered end having circumferentially arranged and angularly disposed openings 41, said openiugs being directed upwardly at an angle to the axis of the tube in proximity to the upper end of the nozzle 12, so that air may readily commingle with fuel.

Slidable in the sleeve 22 against the walls thereof is a tubular adjustable choke member 42, said member being guided by the sleeve 22 and having its upper end inwardly rolled to provide an annular head or restriction 43 in proximity to the inwardlytapered wallsot' the lower end-0t the tube 40. By shifting the tubular choke member 42 withinthe sleeve 22the passage between the tube 40 and the annular restriction 4:3 maybe increased or decreased in area. As shown in Fig. .1 the annular passage is very small and in some instances it may be substantially closed by therestrictionz ll engaging the tube 4.0. From this extreme position the adjustable .choke menrber 42 .or tube 410 may be shifted, relative to each other, so that from a closed passagesuch passage may be grad- ,ually' openedand increased in area until there is an extreme wide open position of the choke member. l

' For adjusting thechoke member 42 said member has its lower end provided with an upstandingoutside arm 44., that is, the arm extends upwardlybetween the walls of the nozzle chamber 7 and the walls-of the sleeve 22.. lVit-h the choke member made of sheet metal it can be easily formed with thelarm -14 and the upper end of said arm can be "furthermore formed to receive the pintle m? a curved crank 46 ;.on the end of a rock shaft 47, vjournaled ina long bearing 18, carried by theflcarburetor body 25. The hearing 48 extends inwardly t'rointhe wall of and through one of the openings 18 of the air intake member and .throttleseat 17. On the outer end of the rock shaft l7 may be mounted a crank 19 by which the :choke member may be actuated and set in a defined position relzv tive to the slceve'22 and the tube 4.0.

Figure .1 shows the parts of this form of carburetor in the position assumed when the associated engine is-idling. The (reduction of atmospheric. pressure in the sleeve air throttle 30. which is closed, causes air to be drawn in the connection 26 into .therarburetor body 25', through the openings 18 on the air intake member v157. downwardly .in :the nozzleichamber 7 and then upwardly in thechoke member 42, A 'quantityot'the air will pass through the openings -ll of the nozzle 3'2) into. the sleeve air throttle 30. it is 1n this throttle that the atomized fuel will commingle with the air passing th-rtmgh. the openings ll and between the tube and the choke or restriction 43, the air coinmiugling with the atomized fuel and passing on to the engine. of fuel and air may be regulated, according to the nature of the fuel, by the choke member, so that there will be either a rich or i an mixture passing through the throttle 30, its the throttle is raised air from the connection 26 may pass in to thethrottle under the lower end thereof and by reason of the tapered wall of the tube ll) being raised relative to the choke member 42 there will be a larger passage between the tube and the choke member for air to pass upwardly through the choke member and meet the air entering the throttle 30 from lateral directions.

I attach conside'ablc importance to the fact that the carburetor is devoid of a great many parts which require adjustment in order to place the carburetor in an operative condition. It is only necessary to properly place the choke member when first placing the carburetor in operation for a specific fuel, and then the throttle 30 is operated in the usual manner to control the speed of the engine. In changing from one fuel to another it may be necessary to adjustthe choke member for desired results, or in some types of automobiles the choke operating means may be articulated with other devices for accelerating or other purposes.

deference will now be had to Fig. 4; showing what may be considered as the horizon tal type of carburetor and in a great many respects it similar to the vertical type. For instance, there is a float chamber having a fuel inlet valve 51 controlled by a float 52 in the float chamber 50. The float in this instance is crescent or scmi-circular in shape, in contradistinction to the circular form shown in Fig. i, so as to prov de clearance for angular-1y disposed parts in the float chamber 50. On the float chainbcr 50 is a cover having an angularly (llSpOEQtl nozzle chamber 54; provided with a vertical em 55 axially of the float chamber 50 and connected thereto by a screw 56. The nozzle chamber 54lcommunicatcs with the float chamber by a depending apertured extension 57 which supports the float arm of the float 52. The nozzle chamber has a sidewall thereof enlarged, as at 59, and supported by the cover 53 and formed in tegral with the nozzle chamber is an air intake member throttle seat 60 having the sleeve 61 extending. into the nozzle chain- The admixture her about a nozzle 62 supported within said chamber in communi'ation with the apertured extension 57, so that fuel within the float chamber may rise to the same level withinthe nozzle 62. a v

Suitably mounted on the cover 53 and connected to the float chamber 50 is a transversely disposed body 63 which has one side.

thereof provided with an air intake connection 64 and the opposite side thereof with a manifold. connection 65, which as set forth in the beginning, may be connected to the side wall of an engine block or cylinder, instead of a manifold.

At the inner end of the connection 65 is an :iingularly disposed tubular guide (36 coaxial with the nozzle chamber 54, so that the guide 66 may have a sleeve air throttle (3'7 to seat on the air intake member 60. The seating end of the air throttle 67 has a spider- 68 supporting a choke member 69 which is slidable in the sleeve 61 and adjustable in synchronism with the air throttle.

In order that the air throttle 67 may be shifted on the guide 66, to and from the air intake member 60, the carburetor body 63 is provided with a rock shaft 70 and on said rock shaft within the carburetor body, is a crank 71 engaging a flange 72 of the air throttle 67. 011 the outer end of the shaft 70 is a crank 73.

Slidable on the nozzle 62, Within the choke member 69, is a hollowtapering tube 74': provided with a series of circumferential and radially disposed openings 75 in proximity to the orifice of the nozzle. The upper end of the tube pin 74 has an aperture '26 affording a secondary nozzle and this end of the tube is suitably .lixed to a perforated tube 77 axially of the guide (band the air throttle 67. The upper end of the perforated tube 77 is connected to a rod 78 extending through an adjustable guide 7 9 screwed vin the top of the carburetor body 63. On the outer endof the rod 78 is an in verted cup shaped head 80 confronting a cup 81 of the guide 78 and extending into the cup 81 and the cup shaped head 80 is a coiled expansion spring 82- encircling the rod 78. The expansive force-of this spring holds the tube 74 normally elevated with the guide 79 limiting the outward nmvmnent of the rod 78.

I A pivoted arm or cam member 83 supported from the manifold or cylinder connection (i5 bears against the head 80 andpermits of said head being depressed, by any suitable operating mechanism, for lowering the tube 74- on the nozzle 62. From a remote point it is therefore possible to regulate the carburetor for a constant initial lean or rich admixture of air and fuel, and

to which explosive mixture additional air 7 may be admitted from between the air intake member 60 and the air throttle 67.

retor are similar to parts Within the -verti-' cal carburetor, the main differences being that .uithe horizontal carburetor, the choke :member is movable with the air throttle mdependent of adjustment of the tube. Whereas in the vertical carburetor the tubevis movable with the air throttle and the choke member has an independent adjustment.

It is thought that the operation and utility of both forms of carburetors Will be ap parent without further description and while in the drawings there are illustrated the preferred embodiment of my invention; it is to be understood that the structural elements are susceptible'to such variations ins'rem'ee andmodifications as fall Within the scope of the appended claim.

dVhat I claim is VA carburetor having a nozzle chamber with a nozzle therein, an air intake member -nozzle. a choke member slidable in the sleeve of said air intake member, and means in said air intake member and extending into said nozzle chamber and to the lower "end of said choke member adapted for ad-

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