US1554619A - Carburetor - Google Patents

Description

Sept. 22, 1925. y 1,554,619

G. M. BICKN ELL CARBURETOR Filed July 25. 1921 `of the idler tube inlet.

l'atentecl Sept. Z2, 1925.

UNITED STATES PATENT omer..

GEORGE M. SBIQKNELL, QF ST. LOUIS, MISSOURI cnnrunn'rcn.

Application filed .Tilly 25, 1921. Serial No. 487,222.

v T0 all whom t may concern.'

Be it known that I, GEORGE M. BIcKNnLr., a citizen of the United States, and resident of the city of St. Louis and State of Missouri, have invented certain new and usefullmprovements in Carburetors, of which the following is a specification, containing a full, clear,.,andexaot description, `reference being had tothe accompanying drawings, forming apart hereof.

My invention relates to improvements in carburetors,.and has for its primary object the provision of a carburetor which `is soconstructed as to secure a more accurate adjustment of the mixture at idle engine speed.

A further object is `to construct a carburetor which can be so adjusted as to secure a uniform and even mixture at the initial Fig.. 3 an enlarged fragmental section of the upper portion of the carburetor showing the idler tube inlet, throttle valve and the reglating screw.

the construction of my d'evice I employl a carburetor having a casing ft having an integrally formed float chamber 5 andin this float chamber is mounted the usual float and needle valvev 6. Formed integrally within the casing `4: is an air inlet 7 and a' mixing chamber 8. Below the mixing chamber 8 and secured within the casing 4 is a choke or venturi 9 into which the main fuel nozzle 10 extends. The lower end of the fuel nozzle o ning into the well 11. This well communicates with the passage 13 opening into the float chamber 5. The passage 13 is provided with a calibrated plug 14 which regulates or prevents too 'rapid a flow of fuelnto the well 11. Formed in the wall of the casing and between the main nozzle 10 andthe float chamber 5 is a fuel passage "'l'his fuel 'passage way conducting fnie'ltothe engine at idle and initial throttle' openlngs. The lower end of the to construct a passage 15 opens into the passage way 12 and is 'provided with a calibrated plug 16 which retards the flow of fuel into the passage way 15. The upper end ofthe passage 15 communicates with the opening 17. A portion of this opening is screw threaded to receive the .adjusting screw 18, whichadjusting screw is provided with a reduced portion 19 which fits into the opening or port 20.

This opening or port furnishes communi-v cation with the passage 15 and with the suction chamber 21 of the carburetor. This port is preferably elongated in form as illustrated in Fig.' 2. Mounted `immediately above the mixing chamber 8 is a throttle valve 22 which is so arranged that when it is closed, it extends across the port 20, so that a portion thereof will be above the valve and a portion below, in other words, divide the port into two portions. Formed through the venturi and communicating with the passage 15 is a by-pass 23.

This ley-pass is so located that it will always be above the fuel level. v

The operation of my deviceis as follows:

A fter the carburetor has been connected i up, and proper fuel connections made, the engine is cranked. When the engine commences to run, the throttle valveis shut oif as indicated in Figs. 1 and 3 and the adjustingscrew 18 is then screwed outward or inward until the desired quantity `of idling mixture is obtained. This movement of the Yscrew 'is to adjust the size of the passage 211 between the edge of the throttle valve 22 and the projection 19 formed on the screw 18. ,As the engine operates a certain amount of air is drawn through the by-pass 23 which is a short distance 'above the fuel level and consequently'will create a partial vacuum and pick up fuel and carry it to the opening 22, then through the .passage 24 into the suction chamber 21.

This ickin up of fuel is also assisted by the air passing around thel valve 22 in the mixing chamber entering -the port l20 and passing throuoh the passage 24. The amount of mi. ture admitted is regulated by the size of the passage 24a., which size is governed by the. reduced portion ofthe screw 18. It is possible, by advancing the screw 18 far enough, to close off the upper portion of the mixing chamber entirely when the throttle valve is closed, but it is preferable in ractice to have the screw 18 backed out ar enough so that' the engine tirely closed or in its idling position.

will run slowly when the valve 22 is en- The adjustment of the .screw 18 also regulates the amount of fuel mixture Supplied during `the initial throttle opening, or until the main nozzle goes into action. `In this way itis possible to throttle the engine so that the altomobile can be run at a very slow speed. i

While I have shown my device as -atv taehed to a carburetor having a single main nozzle, it is obvious that my construction .can be adapted to any plain tube type of carburetor now commercially used, without departing from the spirit of 'my invention. Having fullyy described my invention, what I claim is: I I

1. In a carburetor,l a casing having a mixing chamber and a suctionvchamber, a

-throttle valve located betweeny said cham- Ato be moved toward and from the throttle valve for varying the size of Said unrobstructed passage way adjacent the suction chamber, whereby the amount of fuel and air entering thel suction chamber through said passage when the .valveis closed, is`- regulated. f

2. In a. carburetor, a casing having a mixing chamber and a suction chamber formed therein, a, throttle'valve located in said casing between said chambers, a port formed in the side wall of said casing at the point of communication between said chambers,

said port beingyof greater. diameter than the thickness of the throttle valve 'and adapted to be Abisected thereby when the valve is closed, whereby constant com-- munication between the mixing and lsuction chambers is maintained, a fuel passage `formed in the wall of said casing and communicating with said port,` ascrew located in said casing, said screw provided 'with a reduced' cylindrical end adapted to be eX- tended into said port along the upper portion thereof and .be moved to and from the edge of the valve when the same is l" closed, whereby the size of the passage way leading into the suction chamber is varied. 3; In a carburetor a casing provided with 'a port in its sidewall, means for supplying a mixture of -fuel and air to said port, a throttle valve mounted 1n sald caslng and adapted to intersectI the port when closed, i an adjusting screw carried by said casing, Y

said adjusting screw being provided with a cylindrical end adapted to' extend into the port whereby the size of the port may be varied by adjusting tihe cylindrical end to and from the throttle valve when the same is closed. i

In testimony whereof, I have sigggned4 my name-to this specication.

' GEORGE M. BICKNELL. y

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