US1845710A

US1845710A - Carburetor

Info

Publication number: US1845710A
Application number: US688052A
Authority: US
Inventors: Francis Jacob Richard; Company The Union Indust Trust; Heginbottom Anna
Original assignee: Individual
Current assignee: Individual
Priority date: 1924-01-23
Filing date: 1924-01-23
Publication date: 1932-02-16
Anticipated expiration: 1949-02-16

Description

' Fell 1932 w. G. HEGINBOTTOM ET AL 1,845,710

I GARBURETOR Filed Jan. 25; 1924 Patented Feb. 16, 1932 UNITED STATES PATENT A OFFICE WALTER G. HEGINB OTTOK AND JACOB RICHARD UNION INDUSTRIAL TRUST COMPANY AND FRANCIS, OF FLINT, IICHIGAN; THE ANNA HEGINBOTTOM EXEGUTOBS sun WALTER o. namno'r'rox, nacnasan caaauamroa Application ma January as, 1924. semi! in. 600,052.

This invention relates to carburetors, the object being to provide an air valve which is interconnected with the throttle of the carburetor for the pur ose of varying the vacuum in the mixing 0 amber at various thr0t tle positions.

Another object of the invention is to provide means for varying the tension of the spring controlling the air valve in the form of a cam carried b the throttle valve stem and so constructed t at the tension of the spring is automatically increased when the throttle valve of the carburetor is in substantially closed position or substantially full open position, whereby the mixture will be heavier when the internal combustion engine is idl ng or running at hi h speed.

Another and urther object of the invention is to provide a construction of carburetor and loading valve which can be manufactured cheaply, the parts bein so arranged and 1nterconnectcd that all anger of these parts getting out of order when in operation are rcvented, additional means being provided ior setting the air valve so as to obtain the proper proportion of gas and 8.1! prior to the actuation of the means for ad ust1ng the tension of the air valve.

Other and further ob'ects and advantages of the invention will be ereinafter set forth and the novel features thereof defined by the ap ended claims.

n the drawings,

Figure 1 is a side elevation of a carburetor, partly in section, showing the application of our improved construction of means for varyin the tension of the air valve spring;

%igure 2 is a detail side elevation, partly in section, showing the throttle valve partially open; and

Figure 3 is a similar view showing the throttle valve in full open position.

In the embodiment of the invention as herein shown 1 indicates the body of a carburetor which is provided with a fuel bowl 2. anda fuel nozzle 3 extending into the mixing chamher 4, which is provided with an outlet 5 having a flange 6 of the usual construction connecting the same to the intake manifold of an internal combustion engine. The body is provided with an air inlet 7 controlled by an air valve 8 provided with a threaded stem 9 on which is mounted an adjusting sleeve 10 in the opposite end of which is secured a bolt 11.

The flange 6 is provided with an extension 12 provided with a stud 13 on which is mounted a bell crank 14, the arm 15 of which is provided with a ball 16 for the purpose hereinafter fully described. The arm 17 of the bell crank 14 is provided with a bifurcated bearing, in the furcation of which is mounted the eye of a bolt 11 on a pin 19, whereb as the bell crank 14 is rocked, the position 0 the air valve 8 will be adjusted in respect to its seat.

The stem 9, sleeve 10 and bolt 11 form an adjustable connection between the bell crank and the valve for adjusting the position of the valve in order to get the proper proportion of gas and air.

Mounted within the upper end of the mixing chamber is a throttle valve 20 carried by a stem 21 extending transversely through the walls of the mixing chamber and provided with a cam 22 which is providedwith a lip 23 and a lobe 24 for the purpose hereinafter fully described.

Arranged on theside of the body of the carburetor is a tubular casing 25 provided with a bearing mounted on the throttle shaft at its inner end and supported at its outer end by the ball 16 of the arm 15 of the bell crank 14 which is movably mounted in the casing, said casing being provided with a slot 26 through which the arm passes as clearly shown in Figure 1.

Disposed within the casin 25 is a coil spring 27 which engages the ba 1 16 at one end and a ball 28 at its opposite end, which is loosely mounted within the casing. This end of the casing is contracted and slotted as shown at 29 to receive the cam 22 and when the throttle is in substantially closed position, the lip 23 of the cam is in contact with the ball 28 so as to increase the tension of the spring in order to resist the opening of the air valve 8 so as to increase the vacuum within the mixing chamber of the carburetor.

The valve stem 21 is provided with the usual operating lever and is adapted to be connected to the controlled means in the usual manner and as the throttle valve is moved into position as shown in Figure 2, the tension of the spring is reduced so as to weaken the mixture at intermediate speeds. As the throttle-valve is moved into full open posi-' tion, the-lobe 24 of the cam forces the ball 1 "economical range, say from 10 miles an hour to 50 m1les an hour, it is essential to PIOVldQ means for supplying a rich mixture to the internal combustion engine at idling speed and full speed anda lean mixture at intermediate speed, and by the particular. cons struction of automatic control of the tension engines comprising a body provided with a mixing chamberand a. valvecontrolled air I inlet, a bellgcrank mounted on said body, an

of the spring by the movement of the throttle, we are able to'accomplish thisresult.

By having an independent adjustment for the air valve, we are able to adjust the same independent of the movement of the throttle so as to set the instrument and. while we have shown certain details of construction of air valve and means for-adjustingthe same, we are aware that various changes can be made without departing from the spirit ofour invention, which consists broadly in providing a means for adjusting the tension of the air valve spring at different throttle positions. What weclaim i's:- r a 'lxA carburetorfor internal combustion adjustable connection'betw'een one arm of Stud bell crank and said air valve, a s ring bearmgagainst the other arm of sai bell crank, a throttle valve mountedin said body and a cam 'carried'bysaid throt'tle valve for increasing the com ressionof said spring at high and low spee sand for decreasing the compression of said spring at intermediate speed. p p 7 2. A carburetor comprising a body provided with a mixing chamber having a throttle valve for controlling the outlet and an air valve for controlling an airinlet therefor, a

of said spring at high and low speeds and for decreasing the compression of said spring at intermediate speed.

3. A carburetor comprising a body provided with a mixing chamber havin a throttle valve controlling the outlet, said ody being provided with a valve controlled air inlet, a bell crank mounted on said body and an ad justableconnection between said bell crank and said air valve, a casing carried b the throttle shaft in which one end of sai bell crank disposed, a spring arranged in said casing adjacent said bell crank, a ball arranged in said casing engaging the other end of said spring'and a cammounted on the throttle valve engaging said ball and so consti'ucted that the compression of said spring is increased at high and low speeds and reduced at intermediate speed for varylng the vacuum within said mixing chamber.

4. A carburetor for internal combustion engines having'a mixing chamber provided with a throttle valve controlling the outlet thereof and an air inlet and air valve therefor, a spring disposed within a casing for normally holding said air valve in a predetermined position,va ball disposed in said casing engaging said spring and a cam carried by the throttle valve for increasin the compression of said, spring at high an low speeds and reducing the compression of said spring at intermediate speeds .for varying the vacuum within said mixing chamber.

In testimony whereof we hereunto atfix our signatures.

WALTER- G. HEGINBOTTOM. JACOB RICHARD FRANCIS.

bell crank mounted on said body having a a mounted there-in engaging one of the arms connection with said air valve, a casing mounted'on the throttle'sh'aft having a spring of said bell crank, a ball arranged at the other end of said spring within said'casing and a cam mounted on the throttle valve having a lip and a lobe for increasing the compression