US1670288A - Carburetor - Google Patents

Description

May 15, 1928.

w 5. J. 'cHAPAs CARBURETOR 2 M!) w t Lb W! M. w m w h h I r m h n W s Filed Nov. 4, 192

Patented May 15, 1928.

STEVEN J. GEL-PAS, OI BOSTON, MASSACHUSETTS.

CARBURE'IOB.

Application filed November 4, 1926. Serial No. 146,169.

This invention relates to means for supplying an internal combustion engine with its mixture of air-and a hydrocarbon, as gasoline; and the object of the invention is the effecting of means whereby the proper mixture will be automatically maintained no matter whether much or little of the same is admitted; which will ensure a thorough intermixture of the air and gas; which will provide a'limited supply of the fuel available at any moment for an instant starting of the engine, and which will embody other improvements in details of construction hereinafter set forth.

In the drawings forming part of this specification, Fig. 1 is a central vertical section through the line 1-1 in Fig. 2. Fig. 2 is a horizontal section on the line 2-2 in Fig. 1. Fig. 3 is a side elevation of the carburetor. Fig. 4 is an enlarged sectional elevation of portions of the carburetor chamber showing the details of the liquid fuel valve and associated parts.

The gasoline is supplied from a suitable tank to the receiver 1 in a well known manner, the latter being preferably cast as a part of the carburetor chamber 2 and of the well 3. Axially supported in this chamber is a tube 4 which is in communication with the receiver 1 through the conduit 5; and about the tube 4 is secured a larger tube 6 whose lower end communicates with the well 3. -Near the 11 per end of the tube 6 are a few holes, pre erably six in number, opening through its lateral wall, and immediately above each hole 7 is a radially projecting shield 9 having a concave under surface and three or more fine holes 10 up through it.

At the. upper end of the inner tube 4 is a valve seat 11 normally closed by a needle valve 12 pressed therein by a helical spring 13. For raising this valve and permitting the gasoline to escape from the tube 1, I rovide a small bell-crank lever 14 pivotall y supported at 15 by the wall of the outer tube 6 and enterin a slot 16 in the part 12. The inner arm 0 this lever 14 bears a against a cross pin 17 when its outer arm is pressed in toward the tube. For thus pressing it, a pin 19 penetrates the wall of the chamber 2 and has a bifurcated end 20 engaging the outer arm of the lever 14.v

or thus operating the pin 19, I provide a cam surface consisting of a thin bar 21 adjustably supported at its ends by a swinging arm 22 mounted upon the spindle 23 of a throttle valve 24 within the chamber 2 above the tube 6; the parts bein so disposed that as the valve is opened, the pin 19 is pressed inward and the needle valve 12 correspondingly opened. For the adjustment of the thin bar 21 to render the opening of the valves 24 and 12 to accurately correspond, each end fthebar is attached to the wings 25 of the arm "22 by means of a screw 26 and nuts 27, 29, whereby each end can be shifted toward and from the wings, and thepush given to the pin 19 can be suitably varied.

For carrying out the objects of this invention, I connect the arm 22 by means of a link 30 with a lever 31 fixed on the spindle 32 of a choke valve 33 which controls the admission of air to the carbuetor; whereby the opening and closing of the throttle valve 24-simultaneously and similarly opens and closes the choke valve 33. Consequently, both dampers are opened when the valve 12 is opened, and closed when the latter is closed; and by accurately adjusting the cam surface 21, the amount of gasoline admitted past the valve 12 is proportioned to the amount of air admitted past the damper 33.

I'prefer to provide a pin hole 35 through the inner tube 4', as shown in Fig. 1 through which hole when the car is standing, the

asoline slowly percolates until it reaches 1n the well 3 and in the tube 6 tothe height of the gasoline in the receiver 1, bu no higher. Then, when the valves 33, 24 are thrown wide open for starting, this small quantity of the gas is immediately sucked up into the chamber 2 and thence to the engine, and ignites at once. To prevent evaporation of the gasoline thus in readiness for use, it is well to provide a cock 36 in the well 3 and to close the same in case the car is to stand idle for any considerable length of time. This cock also permits of a regulation of the admitted air.

The purpose of the perforated arms 9 projecting from the outer tube 6 is to more thoroughly intermix the air and issuing gasoline. As the fuel is sucked out through the holes 37 and 7, the air, rushing past the arms and through the small holes 10, acts to thoroughly break up and volatilize the fuel so that it and the air will be made a erfectly uniform mixture.

at I claim as my invention is:

1. In a carburetor, having two vertical tubes, one spaced within the other, the larger ill) 2. A carburetor as set forth in claim 1, the means for raising the valve comprising a horizontally movable rod adapted by its movements to raise and lower said valve, a swinging arm, a thin bar and adjusting screws attaching it at an acute angle to one side of said arm to bear against the exposed end of said rod.

In testimony that I claim the foregoing invention, I have hereunto set my hand this 3rd day of November, 1926.

STEVEN J. CHAPAS.

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