US1701600A - Carburetor - Google Patents

Description

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. EDWARD a. Yao, on PEARL RIVER, new Yoan.

caaauianfron..

Application lerl March 29, 1927. Serial No. 179,370.

My invention relates to carbin'etors for internal' combustion engines and has `for its object to provide a device of this character designed to more eliiciently vaporize the fuel before supplying the sam-e to the engine; to eliminate the so-called fiat-spot commonly occurring in motors at the beginning of the period of sudden acceleration due to 'the momentaryv unbalancing of the fuel mixture; to provide means formed integrally with the carburetor adapted to supply a primary charge of fuel to the motor before the same kis started and to control the flow of fuel in proportion to the air by a valve mechanism actuated by the movements of the control throttle. v

A further object resides in the assembly of the various working parts in a neat and compact manner `and 'protectingthe fuel chamber'from the admission of dirt ard dust, to limit the construction to few working parts and arrange the same in an efficient operating relation and thereby to reduce the cost of manufacture to a minimum.

@ther objects and 'advantages .reside in the construction, combination and arrangement of the Various elements forming the invention as more fully hereinafter described and claimed, reference being had to the accompanying drawing forming part hereof, wherein like numerals `refer to like parts throughout the specification and in which Figure l is a perspective view showing' the exterior design of the device,

.Figure 2 is ab vertical longitudinal .sectional view, and

Figure 3 is a detailed perspective view of the tubular air control valve.

Referring now to the drawing wherein for the purpose of illustration I have shown ay lnfeferred form of my invention, l provide a `carburetor bowl 5, preferably cup-shaped, and having a cover plaie (i fitted thereover and from the center of which a fuel feed tube i" is suspended within the howl with .its lower end spaced slightly above the bottom there.- of. An annular float 8 is arranged iu the bowl, to which is attached one end of a pivotally mounted arm 9 extending laterally of the bowl and' having its opposite end con nected with a valve 10 adapted to seat within the fuel feed passage formed at one side of the bowl and communicating with the intake pipe 11 leading to the supply tank, thereby providing for maintaining a proper amount of fuel in the bowl.

. with a knurled head 25.

Upon the cover plate t3 l provide a block 1Q, which may be of any suitable shape and having a. bore extending horizontally therethrough within which is lslidnibly fitted an elongated tubular air control valve stem 1? extending' outwardly from the block at each end. At Yone end of the stem is formedv a tapered head 14 adapted to have its sides seat into and close a reduced neck 15 of an air intake 1:6 which is formed integrally with-the cover plate 6l and constitutes an extension thereon, the en d of the head extending beyond the closed neck. The necked end ofthe air intake is connected with the intake manifold pipe 17 of the engine and the opposite end is open and of sutliciently increased diameter to Apermit the .circulation of air entirely aronndthesteni 13 and head 14.

The stem and head have a bore 18 extending longitudinally therethrough within which is arranged a fuel adjusting` valve stem 19 having a head 20 adapted to close the end of the bore 18 extending beyond the closed neck and the opposite end of the valve stem 19 is provided with an adjusting screw 21' formed integrally therewith.

The tube is provided with zin-extension 22 lea-ding upwardly through the base of the block 12 and communicating with the bore 1.8 through a longitudinal slot 23, the slot permitting` the limited sliding movement of the stem 13 with respect 'to the tube extension.

A needle valve 24 is arranged in the end of the extension 22, and protrudes laterally of the block where its outer end is provided N ear the outer end of the needle valve is arranged a collar 25 to which is attached one end of a pivotallymounted arm 26 having its opposite end contacting witlra cam 27 formed on a lever Q8 to which the throttle control rod 29 is attached. A coil spring 30 is mounted on the upper end of the needle valve 245e and seated in .a recess 30 formed in the block with the upper end of the i-'} 1in.g abut ting the collar Q5 and operating to open the needle valve with the opening of the throttle. The cam 2T carried on. the throttle lever and engaging the. arm 26 operates4 to close the needle valve with the closing of the throttle.

At one edge of the lever 28 is formed a yoke 31 engaging a pin 32 carried on the end of the stem 13 opposite from the head 14, so that the movement of the throttle will cause the longitudinal sliding of the stem 13 thus moving the head la into and out of seated position in the neck of the air intake.

Upon one side of the stem 13 I provide a small disk 33 constituting a plunger adapted to be slidably arranged in a cylinder 34 formed in the block 12, the cylinder having an air openinp'. An air passage extends from the cylinder to a hollow rib 36 formed on the wall ot' the bowl 5 4and opening into the bowl immediately beneath the lower end ot the tube 7. Thus the sliding movement of the stem 13 will operate to move the plunge in the cylinder thereby forming an air compression in the passage and forcing` the fuel upwardly in the tube 7 and into the bore 1S leading to the intake manifold. It is obvious that'the throttle may be opened and closed before the engine has been started and by so doingl a priming charge of fuel is forced into the engine thereby enabling the instant starting` of the same as soon as the ignition is turned on.

I claim: y

l. A carburetor comprising a fuel bowl andan air intake, a slidably mounted valve for said intake with a head at one end for controlling communication through the intake and having a bore exitending` therethrough with an outlet beyond the head ot end of the intake and a stem 'formed there.4

on, said head and stem having a bore extending` therethrough. a block carried on the bowl tor sli-dably supporting the stem, a fuel feed tube connecting the bowl and the bore, a valve arranged in said tube, a cylinder tori-.ned in said block, a plunger carried by the stein and operatively arranged in the cylinder andiactuated by the movement ot the stem, a hollow rib formed on the bowl and effecting' communication between the cylinder and the tube and a control lever oneratively attached to the stem and the tube valve tor the simultaneous movement thereof.

In testimony whereof I ailix my signature.

EDVARD J. YEO.

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