US1476701A

US1476701A - Carburetor

Info

Publication number: US1476701A
Application number: US419261A
Authority: US
Inventors: Claude E Fleming
Original assignee: Individual
Current assignee: Individual
Priority date: 1920-10-25
Filing date: 1920-10-25
Publication date: 1923-12-11
Anticipated expiration: 1940-12-11

Description

G. E. FLEMING CARBURETOR Dec. 11 1923.

Filed Oct. 25 1920 2 Sheets-Sheet 1 a INVENTOR.

6212075 E Zia/111% ec. 11, W23. mama Q. E. FLEMNG GARBURETOR Filed Oct. 25, 1920 ZSheets-Sheei 2 M V I N VEN TOR.

i A TTORNEY.

Patented Dec. 11, 1923.

. 1 1,476,701 OFFICE;

.CIJAUDE E. FLEMING, OF DETROIT, MICHIGAN.

CARBURETOR.

Applieation filed October 25,1920. Serial No. 419,261.

To all whom it may concern:

Be it known that I, CLAUDE E. FLEMING, a citizen of the United States, residing at Detroit, in the county of Wayne and State of Michigan, have invented certain new and useful Improvements in Carburetors, of which the following is a specification.

This invention relates to carburetors, and

has for'its object a. carburetor provided with an automatic regulation for the 'auxilia air and also a manual control for the auxi iary air. A special form of float and needle valve is utilized.

One of the novel features of the 'carburetor is the arrangement of a fiber or felt,

wick through which a regulatable quantity of air is drawn to vaporize the fuel oil, as

will be more fully explained hereafter.

In the drawings,- V Fig. 1 is a side elevation of the carburetor showing a part of the throttle chamber in section.

Fig. 2 is an elevation of the carburetor taken ninety degrees removed from Fig. 1

and showing the lower portion of the carburetor in vertical section.

Fig. 3 is a section on the line 3-3 of F ig 2.

ig. a is a section on the line 4-4; of 30 Fig. 2.

ig. 5 is an enlarged section of the lower portion of the carburetor showing how more air is admitted by pulling the draft rod.

Fig. 6 is a section on the line 6-6 of The carburetor is of simple construction, comprising simplv ajflfloat chamber a. formed by a casting upon which is mounted, by screwing thereto, a cylinder 1) which carries the auxiliary air intake and the control for the same, which will be presently described. The casting a; is provided with'a depending boss a forming a nozzle socket. The cap ii that closes the lower end of the casting is provided with a projecting boss or air tube 6. This has substantially the same configuration as the socket in the boss 0. A wick f of fibrous material, such as loose felt, is adapted to fit over the air tube (2 and engage in the space between the air tube and the socket in the boss. This wick is adapted Ito-raise the fuel oil contained in the float shaft 3 that carries the throttle valve is jourcontinuation will be designated the throttle I This wick is. sufficiently porous to allow the passage o f airtherethrough, which is introduced by the air tube e and which is provided with .a. relatively large central bore 9 communicat ing with an air valve chamber h and in. which is arranged the air valve 6 which is; never completely closed. Aspring j engages" between this air valve and the screw plug la. This screw plu is provided with air orifices Z.- A pair 0 lugs or arms we depend from this screw plug and are adapted to'" hold the pin n on which the cam o is pivoted; This cam' 0 has a draft connection p that may be led to any convenient point as on' the dash of the car. The bottomof the cam v o engages with the cam, follower that is) perforated and screw-threaded to i'eceivethe threaded valve stem r. The jam-nut a is also threaded, onto this stem. The member g-is adjustable on the stem I The float is a cork rin t which enga about the bossc and which is secured willevfioat arm u by means of the continuation oi r to the boss onan arc whose center is at y.

This construction eliminates the usua-Pw counterweighted arms used on floats to" con vert the rising movement of the float/into the descending movement of the needle valve; and the drop of the float into rising'movei,. ment of the needle valve' These counter weight levers are not only more expensive 'g construction but they'often result in trouble due to cramping on their bearings and sticking. I find that an oblique float, as shown, works much better as it travels u on'an are.

The throttle valve is designa '2 and-the naled in a continuation of the cylinder-b that forms the auxiliary air intake. .aThis 106 valve housing and is lettered 4. The arm 5 is attached to the throttle valve shaft-and I may beconne'cted by the usual draft rod to the throttle lever on the steering post, Or the arm.30 may optionally be connected with 110 the throttle lever on'fifthe steering post; A' stub 6 on the memberfjbearing arm 5 is adapt- 5 cylinder '1). Obviously the rotating less of this auxiliary air intake adjusted slightly up I to the other end by reason of the slots 21 air at any throttle valve,

' tube andthe boss.

ed to be engaged by the point 7 of the adjusting MKQW 8 to adjust the idling speed oi the motor at closed throttle. NOthln is claimed for these throttle connections. fiowever, on

L the other end of the throttle shaft is secured an arm 9 which connects throu h aiball and socket/joint 10 with a rod 11 t at asoconnects through a ball and socket joint 12 with the revolving sleeve or shutter 13 that rotates on the exterior of the cylinder b. 14: designates a screen that is secured 1n the opening of the cylinder b and that guards the auxiliary air intake. The auxiliary air intake is a rectilinear opening'through the sleeve 13 more or epending upon the throttle position. When the throttle is opened up wide this entire auxiliary air intake is automatically opened by reason of the ball and socket and rod conl'lBLtlOl'lS 10, 11 and 12.

fifmanual control for'the auxilia air intake is afforded by the curtain 16 w constitutes a shutter for uncoverin 'with'the screw studs 19 provided with hea s at 20. The curtain may be adjusted simultaneously at both ends or one end may be ordown with respect permitting; a certain tilting. Obviously this regulates to a given throttle opening. The

as already explained, automatically opens up the auxiliary air intake in accordance with the throttle opening.

in starting the draft rod 29 is pulled, causing the rotation of the cam o to depress the cam follower g which carries the air valve downwardly, enlarging the air intake to allow a great amount of air to be drawn of taking through the wick for the purpose uel oil fed by up a greater amount of the the wick.

' The valve stem 1' by loosenin the jamnut a may be adjusted through t e follower g to alter theamount of air entering through V the air tube 6.

The operation of the carburetor as regards the enrichingof the'mixture by enlarging the amount of air passing through the wick is as follows:

The wick is packed 'in between the air If it werent packed in this way and the suction were strong enough the raw fuel would be drawn up 'insucquantities'as to make the construction impossible. i It wouldoperate in the same way a needle valve carburetor operates, except the quantities of fuel would be very large. "With the wick packed in between the air tube and the boss socket only fuel oil fed up by capillary action is available. This fuel is ich is a' thin sheet'metal member that can be adnicety the amount of auxiliary tamper picked up by air passing through the wick. Now if a small quantity of air passes through; the wick the saturation of the wick may be greater than that quantity of air can handle, but with a larger quantity of air, the air may pick the fuel up as fast as capillary action will feed it up into the top of the wick. Nowthis is the critical point and a further admission Oll' air through the air tube would simply dilute the mixture. Only -a small quantity of air, compared to the total amount of air goes through the air tube, in fact by screwing up theair regulating valve,

it is possible to make the air for ordinary running a very small proportion of the total amount of air. Consequently if the wick is large enough it will feedmore fuel oil than that small quantity of air can take up, hence an enlargement of the cross section of the air column will, within given limits produce a richer mixture. The limit can e fixed by the shape of the cam.

What i claim is:

1. In a carburetor, the combination of a casin divided into a mixing chamber and a fuel reservoir connected by a passageway, a wick completely filling parts of said passageway so as to choke the same and pre vent passagev of fuel except that fedthro'ugh the wick, said casing provided with a port for delivering air directly into the mixin chamber, and with a tube of relatively sma air delivery capacity compared with said port for delivering air to. the wick so as to cause the same to pass through the wick beforeentering the mixing (chamber, and means for regulating the amount of, air admitted to the air tube to enrich the mixture directly as the amount is increased up to the critical point, at which time all of the fuel fed up the wick is taken up by the air, completely saturating thesame.

2. In a carburetor, the combination of a casin divided into a mixing. chamber and a fuel reservoir connected bya passageway,

- the casing provided with a pbrt for admitwhich may. be also diagonally tipped to vary the port opening from side" to side, and a rotary shutter operating in adirection substantially '90 degrees removed from the movement o the curtain in; adjustment,

the said shutter provided with connections by which it can be caused to automatically move with the throttle movement.

'3. in acarburetor, the combination-of a casing divided into a mixing chamber and a fuel reservoir connected by a passageway,

awick completely filling partsof saidgpassageway so as to choke the same and prevent passage of fuel except that fed through the wick, said casing provided with a port for delivering the air directly into the v n /acct mixing chamber and with a tube of relatively small air delivering capacity for deliverlng air to the wick so as to cause the same to pass through the wick before entering the mixing chamber, and means for reg ulating the amount of air admitted to the air tube under normal running conditions including devices for permitting an unusually large amount of air to enter the tube for starting said devices permitting the parts to return to the normal position of adjustment for runnin after starting.

4. In a carburetor, t e combination of a casing divided into a mixing chamber and fuel reservoir connected by a passageway the'said casing being provided with a downwardly depending boss provided with a socket and with an upwardly extending air tube adapted to fit into the socket of the boss and a wick packed in between the interior of the boss and the exterior of the air tube, said casing provided with a port for delivering air directly into the mixing chamber and the said air tube delivering a small amount of air through the wick packed between the tube and the boss and means'for regulating the amount of air ad- 7 mitted to the air tube.

In testimony whereof I afiix my signature.

CLAUDE E. FLEMING.