US1773289A - Carburetor - Google Patents

Description

25 I mm mm 1 A 1%:-

H. c WAITE 1,773,289

CARBURETOR Filed Feb. 25, 1925 llll lNVENTOR H. C Wail e BY ATTORNEY Patented Aug. 19, 1930 UNITED STATES,

PATENT OFFICE HARRY C. WAITE, F EVAN STON ILLINOIS, ASSIGN OR OF ONE-SIXTH TO J. P. ARTHUR,

OF OAKLAND, CALIFORNIA; ONE-SIXTH TO C. F. ARTHUR,

DE LOS AN GELES, CALL FORNIA; ONE-SIXTH TO B. A. DUNANN, 0F OAKLAND, CALIFORNIA; ONE-TENTH TO GEORGE I. HAIGHT, OF CHICAGO, ILLINOIS, AND MARCUS JACOBSON, OF WAU- KESHA, WISCONSIN, AND ON E-TENTH TO EBENEZER WELLS, OF OAKLAND, CALI- FORN IA; R. A. DUNANN ADMINISTRATOR OF SAID WAITE, DECEASED cARBuRE'roR i Application filed February 25 1925. Serial No. 11,431.

This invention relates to carburetors, more particularly of the floatless type, an example of which is illustrated in patent application, Ser. No. 693,969, filed by me February 10,

The object of the invention is to improve the effectiveness and extend the usefulness of carburetors of motor vehicles employing gravity fuel feeding systems; more specifically, its object is to provide means forautomatically regulating the amount of vacuum in a carburetor or afford the induction of fluid requisite to elevate the same from a supply tank located below the carburetor for operating the engine to propel the vehicle when travelling either upon a horizontal or inclined road. By the provisioi1 of devices thus characterized, a floatless carburetor is capable of being employed in association retor casing having with a fuel supply tank positioned below the level of the fuel feed connection and without the use of an auxiliary, or vacuum tank, into which the fuel is drawn, from the supply tank and then discharged by gravitation to a carburetor.

The invention consists inimproved gravit-y actuated means for controlling the vac-.

uum regulating devices of a carburetor, and in the novel, construction, adaptation and combination of the parts thereof as hereinafter described and claimed;

My invention ,comprehends" a mechanical method of carbureting in which a partial vacuum is-controlled by the inclination of" the carburetor in order to securegreater suction on the fuel on an up grade than onzthe level road and to materially decrease or eliminate suction down grade.

The accompanying drawing is& vertical longitudinal section of a carburetor embodying my improvements. i I V In said drawings, 5 represents the carbuthrough its entire length with a throttle valve 7 at its front or outlet end. which is open position when the nected to a a passage 6- extending communicatively connected to the intake mamfold, not shown, of an internal combus- U011 engine.

The inlet 8 at the rear end of the passage 6 is open for the admission of air from theexternal atmosphere subject to the control of a choke valve which is indicated by 9. Provided in the carburetor passage between said throttle and "choke valves is a flap valve 10 which is connected near its upper edge to a pivot pin or spindle 11.

The carburetor is formed to have Below the valve 10 a cylinder 12, the bore of which communicates at its 'lower end through an inlet hole 13 with the external atmosphere; and at its upper end through an outlet hole 14 with the space between the valves 9 and 10:

Within said cylinder is a piston 15 having a stem 16 extending upwardly through a guide hole of the casing to have its upper end engageable against valVelOto swing thesame upwardly into its piston is elevated by atmosphericpressure acting against its underside.

To permit a small leakage of air by the piston, the latter may be'of slightly less diameter than the cylinder bore or, as shown, providing the piston with leak holes or notches such as 17. i f 19 represents a fitting adapted to be congasoline supply pipe engaging in the underside of the casing to extend, as a nozzle 20, into the passage 6 intermediate, the throttlevalve 7 and the flap valve 10.

Arranged to seat in the orifices of said nozzle is the conical lower, end 21 of a vertically disposed rod 22, hereinafter designated as valve is a spring 24 of suflicient power, to

overcome the weight of the needle and ele- 65 the underside of the vate the same into its open position with respect to the nozzle orifice.

25 represents a lever fulcrumed atone end by means of a screw 26 which engages a post element of the casing.

Said lever extends over the needle valve to which itis operatively engaged by means of an adjustable screw 27 and has its free end connected by means of a pin 28 with the head of a bolt 29 which extends vertically through a guideway of the'casing into engaging relation with the flap valve 10.

v 30 represents a spring connected to a stud element 31 of the lever 25 and tends to cause the lever to retain the valve 10 inits closed choke valve 9 to shut ofi the supply of air,

more or less. admitted into the carburetor.

As shown, said means comprises an arm 3'2 secured to and depending from the spindle 11 by which the choke valve is pivotally connected to the carburetor casing 5, and a heavy body 3-1 which is secured to the lower portion of the arm 32.

Said arm and weight constitute a pendulum-like device which is acted upon by gravity to retain the valve 9 in its closed position. indicated by full lines in the view. with respect to the air inlet 8 when the longitudinal axis of the carburetor is horizontal or nearly so: and also serves to cause the valve to swing into its dotted line 9 positionto open said inletwhen the front end of the carburetor is tilted down. The weight gives increased resistance to the opening of the choke valve when the front of the carburetor is elevated. T

To enable the choke valve tobe manually regulated as, for example. when starting the engine. a controlling rod such as 35 may be employed. said rod being connected either to ,the' arm 3:2 or, referably. to a second arm 36 of said spin le.

. nection shown being1 To permit movement of the choke valve independent of the controlling rod 35 the connection between the latter and the arm 36 is such as to provide lostmotion, the conatforded by the provision of a slot- 37 in' t e rod to receive a crank pin element 38 of thearm 36.

. 39 represents a set screw for securing the bodv 3* to the spindle arm 32 at selected distances from the choke valve axis to regulate the power of the body."

It will be' evident from the preceding description taken in connection with the drawing. that my improved device including the automatic choke valve control hereinbefore described is designed for use either with a fuel storage tank located below the feed nozzle :20 of the carburetor or with a gravity fuel feed system wherein the, gasoline reservoir or storagetank. not shown, is normally located at an elevation higher than that of the orifice of the fuel feed nozzle 20. In case the vehicle is equipped with the gravity fuel feed system, when the vehicle to which the carburetor applied ascends an inclined road. the consequent upward tilting of the front end of the vehicle likewise tilts the carburetor and raises the fuel feed nozzle to an elevation higher than that of the reservoir. resulting in the stoppage of gravity induced fuel feed.

In this instancehowever. gravitation actingthrough the medium of the body 3i and the arm 32 retains the valve 9 at a predetermined angular relation with respect to a vertical plane. whereby the longitudinal tilting'of the carburetor will serve to effect a relative closing movement of the air entrance 8 thereof with respect to the choke valve.

\Vith the admission of air directly into the carburetor passage thus stopped, or partially so. the engine created suction in the passage 6 will serve to induce the flow of fuel through the supply nozzle :20 into the carburetor even when the nozzle orifice is above the fuel level in the reservoir. From the foregoing. it is seen that the gravity controlled choke valve causes a gravity fuel feed-system to function as a vacuumfeed system when the associated vehicle's front end is tilted up.

'hen the choke valve is closed a suction within the carburetor passage 6 atfords a partial vacuum above the piston 15 in the cylinder 12 to coact with the atmospheric pres ure against the under surface of the piston to cause the same to ascend and cause the flap valve '10 totbe swung upwardly in its open position with respect to the carburetor passage 6;

The flap valve when swung upwardly pushes the rod 29 therewith to elevate the lever 25 whereupon the spring 24 acts to raise the needle valve 2'2 from its seat in the nozzle 20.

with the main air inlet- 8 closed by the choke valve the only air admitted into the carburetor is the relatively small quantity which paes by the iston 15 so that the resultant mixture suc 'e'd from the carburetor is of a character rich in hydrocarbon. After the engine is operated by the explosion of charges of such a fuel mixture and the choke valve 9 is returned into its full open position, air being admitted through v the inlet 8 serves to keep the flap valve at elevations varying with and responsive to the suction operations of the associated engme.

It will thus beseen that the carburetor operates by a mechanical process in controlling the partial vacuum and thereb regulates the fuel in accordance with the inclination of the carburetor, for travel on the level, the valve resting in the position as shown in full lines with the weight supporting arm 32 in a perpendicular position. The normal suction of the engine will swing the valve to permit suflicient 'air to enter, or the rod 35 may be thrust forward to open the valve slightly. On the downgrade, the weight will swing the valve tothe dotted line position as shown. On the upgrade the steeper the grade becomes, the greater the turning moment of the weight. Thus as the inclination increases, the choke valve is pressed tightly against the wall of the carburetor and a greater suction is required to-open it,

thereby creating a greater vacuum.

7 What I claim, is

1. In a carburetor, a fuel supply nozzle, a sprin operated needle valve for said nozzle, a mec anism tending to close the same, an air controlled valve operating said mechanism, a choke valve and means rendered operable by a tilting movement of the carburetor to automatically effect the closing of said choke valve to afford within the carburetor a partial vacuum to influence said air controlled valve and the delivery of fuel through said nozzle.

2. In a carburetor, the combination with the carburetor casing having a .passage therethrough, a fuel nozzle extending into said passage, a valve for said nozzle, a choke valve provided for the inlet of said'passage, means actuated by tilting movements of the carburetor to effect opening and closing of said choke valve, and air controlled means rendered operable by the closing and opening of the choke valve for regulating said nozzle valve.

3. In a carburetor, for an internal combustion engine, an air passage made forcbnnection to the suction side of the engine, a nozzle adapted to discharge fuel thereinto when sucked upon, and means for automatically changing normal suction on the nozzle when the carburetor is tilted from its normal plane includin a resisting choke valve in combination witfi suction operated auxiliary means rendered automatically operative by change in position of said choke valve for simultaneously effecting a corresponding change in the active port area of the nozzle.

4. In a carburetor for internal combustion engines of motor vehicles wherein the" carburetor is mounted so as to assume a predetermined normal osition when the vehicle is on level groun the combination with a chamber having an outlet communicating with the intake of the engine and an inlet opening communicating with the atmosphere; a controlled nozzle adapted to discharge fuel into said chamber when subjected to suction; and valve means controlled by tilting the carburetor from its normal position for changing the effective port area of the nozzle to a predetermined extent to feed *the proper amount of fuel to the motor.

5. In a carburetor for internal combustion motors, the combination with a chamber the combination with a mixing chamber having an outlet communicating with the intake of an internal combustion engine and an inlet communicating with the atmosphere; of a fuel feed means communicating with said mixing chamber; a fuel feed valve co-operating with said fuel feed means for controlling the amount of fuel fed to said chamber;

a gravity actuated choke-valve at saidinlet.

adapted to have its position changed by changes in relative position of the device itself with reference to the horizontal; and means rendered autom'aticz'tll operative by change in position of said choke valve for actuating said fuel feed valve.

. 7. In a carburetor for internal combustion motors, the combination with a mixing chamber having an outlet communicating with the intake of the motor, a main inlet communicating with the atmosphere and an auxiliary inlet communicating with the atmosphere; I"

of a choke valve for said main inlet; means rendered effective by changes in position of the carburetor for opening and closing said choke valve; fuel feed means communicating with said mixing chamber; a suction device actuated by the air admitted through said auxiliary inlet when the choke valve is arranged to close the main inlet; and means actuated by said device for controlling the fuel admitted through said feed means to the mixing chamber.

8. In a device of the character described, the combination with a mixing chamber having an outlet communicating with the intake of an internal combustion motor and an inlet 7 communicating with the atmosphere; of a fuet feed passage communicating with said mixin chamber; means co-operating with said fuel feed amolfnt of fuel ed to saidmixing chamber;

assage for controlling the suction-operated means for actuatin said controlling means: valve means contro led in accordance with the ition of the device with reference to the orizontalfor cont-rolling the amount of air admitted atsaid inlet to efiect a partial vacuum in said carburetor and thereby render operative. said suctionoperated means.

Signed at Palo Alto, California, this 30th day of December; 19:24.

- HARRY c. WAITE.

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