US1186166A - Carbureter. - Google Patents

Description

tion.

UNITED STATES PATENT OFFICE.

ASHLEY C. BENNETQ OF MINNEAPOLIS, MINNESOTA.

CARBURETER.

Application filed. m 16, 1914. Serial No. 851,273.

To all "whom it may concern Be it -known that I, ASHLEY CBENNETT, a citizen of the United States, residing at: Minneapolis, in the county of Hennepin and State of Minnesota, have invented certain new and useful Improvements in Carbureters, of which the following is a specifica- 'My invention relates to carburetors and has for its object to provide novel means for controlling the operation of the valve for admitting secondary air and regulating the fuel admission.

It is the object of my invention to apply to. the valve-stem for secondary air a dashpot construction with a small and controllable by-pass whereby the movement of the secondary air-valve will be steadied and not fluctuate and jump.

The full objects and advantages of my invention will appear in connectionwith the detailed description thereof-and are particularly pointed out in the claims.

The figure of the drawing, illustrating the application of my invention in one form, comprises a sectional elevation view of a carbureter involving my improvements.

As illustrated, a casing 10 is formed with a fuel chamber 11 in communication with asource of fuel supply 12 controlled by a floatvalve construction 13 of common form, the valve and fuel supply not being shown. Directly connected with the chamber 11 is a dash-pot chamber 14 formed of a supple mental casing extension 15 having a by-pass 16 in a wall thereof, opening at 17 into chamber 14 and at 18 into chamber 11. .By means of a screw 20 the opening 17 of the bypass may be increased or diminished, as desired, for a purpose later to be explained. The chamber 11 communicates through a passageway 21 with a feed casing 22 at the bottom of the carburetor mixing chamber 23 formed by casing and pipe 24, and the floatmeans of'a spring 31, said spring being positioned between the bottom casing wall and a collar 32 on a valve-stem 33, which extends through a cylindrical bearing or box ing 34 into chamber 11 and through an enlarged aperture in float 13 to the top of chamber 14, where a piston 35 is secured to said valve-stem 33 and works freely but in close engagement with the walls of chamber 14. Connected with valve-stem 33, through anextension 36 of collar 32, is an arm 37 which is pivoted at 38 and has an arm 39 extending from said pivot into chamber 23 and controlling a needle valve 42, operable through feed pipe 40 for regulating the feed of fuel through duct 41 in feed casing 22.

Specification of Letters Patent. Patented June. 6, 1916. l

The carburetor operates in the following manner. At slow speeds primary air is admitted through ports 43 in the casing 24 and fuel oil feeds past the .valve 42 and into the feed-pipe 40, frim which it discharges through a multiplicity of openings 45 in the walls thereof, the valve 42 being adjusted by hand screw 44' so as to admit gasolene at the desired rate,at slow speeds. When the speed of the engine increases and the consequent vacuum in chamber 23 and connected chamber 28 reaches the desired degree, the pressure of the atmosphere upon valve 30, or

what is commonly designated as the suction passageway 17, the valve 30 cannot jump,

downwardly under sudden increase of pressure, but must move slowly, owing to the time required for the trapped oil displaced to pass out through duct 16. when the vacuum falls in chamber 28' and the pressure rises, the piston 35 prevents the Conversely,

spring 31' causing the valve 30 to jump" quickly back into closing position. It will be apparent, therefore, that with this construction the valve 30 is steadied in its operation and cannot, anddoes not, fluctuate.

The result is a much steadier flow of secondary air, more uniform mixing of air, and

less tendency to condensation in the manifold from pulsing changes of velocity of the combustion mixture.

I claim:

1. A carbureter comprising a casing formed with a fuel chamber and a secondary air passageway separate therefrom and positioned above the fuel chamber, and also having a dash-pot chamber opening directly from the bottom of the fuel chamber below the secondary air passageway, a duct or bypass being provided leading from the bottom of said dash-pot chamber to the fuel chamber and an admission port for secondary air being provided, a valve spring-held to close said admission port, a stem attached to said valve and extending through the fuel chamber and into the dash-pot, and a piston in the dash-pot on said valve stem.

2. A carbureter comprising a casing formed with a fuel chamber and a secondary air passageway separate {therefrom and posifive cents tioned above the fuel chamber, and also hav mg a dash-pot chamber opening directly from. the bottom of the fuel chamber below the secondary air passageway, a duct or by-pass being provided leading from the bottom of said dash-pot chamber to the fuel chamber and an admission port for secondary air being provided, a valve spring held to close said admission port, a stem attached to said valve and extending through the fuel chamher and into the dash-pot, a piston in the dash-pot on said valve stem, and means for controlling the extent of opening of the duct to vary the rate of movement of the piston in the dash-pot.

In testimony whereof I affix my signature in presence of two witnesses.

ASHLEY C. BENNETT.

Witnesses:

H. A. BowMAN, F. A. WHITELEY.

each, by addressing the Commissioner of Patents Washington, D. G.

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