US1803613A - Carburetor - Google Patents

Description

May 5, 1931- w. G. HEGINBOTTOMV I ,6

CARBURETOR Original Filed Feb. 26, 1925 Patented May 5, 1931 UNITED STATES PATENT OFFICE WALTER G. HEGINBOTTOM, OF FLINT, MICHIGAN, ASSIGNOR TO MARVEL CARBORETOR COMPANY, OF FLINT, MICHIGAN, A CORPORATION OF INDIANA.

osnreunnron Application filed February 26, 1923, Serial No. 621,190. Renewed July 23, 1930.

This invention relates to certain new and useful improvements 'in carburetors, and more particularly to that class of carburetors employing a high and low speed jet having I; asuction controlled valve arranged over the high speed nozzle, the object being to provide v means for controlling the supply of fuel to the hi h speed nozzle by the movement ofthe throttle so that at any determined range of in speed the supply to the high speed nozzle can be increased.

Other and further objects and advantages 25 of the invention will be hereinafter set forth and the novel features thereof defined by the appended claims. 7

In the drawings, Figure 1 is a side elevation partly in sec- 80 tion showing my improved construction of carburetor;

Figure 2 is a vertical section through the same; and Figure 3 is a detail section of the valve.

In the drawing I have shown the body of the carburetor constructed of two tubular members 1 and 2 connected together, the upper member being provided with a heat jacket and the lower member with a lateral airinlet 3, but it is, of course, understood that the particular manner of forming the body is immaterial. The lower end of the member 1 is closed by an insert 4 provided with an upwardly extending member which is provided with an air passage 5 having a venturi 6 arranged inits upper end in which extends a low speed nozzle 7 supplied with fuel by a fuel passage S'eXtending from the fuel bowl 9 which is provided with the usual float for 50 controlling the supplyof fuel thereto and for A still further object of the invention is to 11, the tension of the spring being adjusted by a screw 12.

The construction of carburetor thusfar described is substantially the same as the well known Marvel ty. e of carburetor now in gem oral use; and whlle I have shown certain details of construction, of course, these can be modified without departing from the spirit of my invention.

The insert 4 is provided with a valve casing 13 having a fuel passage 14 extending therefrom to the fuel bowl 9 and an outlet passage 15 on which is arranged a highs eed nozzle 16 extending up into the body of the carburetor above the air inlet and terminating adjacent the free end of the suction controlled valve 10. The lower end of the valve casing 13 is closed by a plug 17 and the upper end is internally threaded in which is screwed the threaded lower end of a cylinder 18 in which is mounted a valve stem 19 provided with a conical valve 20 at its lower end adapted to seat on the valve seat 21 formed in the valve-casing, said valve stem extending upwardly through a bearing 22 formed on theupper end of the cylinder and is pro vided with an eye 23 to which is connected an operating wire 24 connected at its upper end to an arm 25 mounted on a stem 26 of a throttle valve 27 arranged in the upper end of the section 2.

The stem 19 of the valve is surrounded by a coil. spring 28 for normally holding the valve on its seat and the valve is provided with a vertical bore 29 which is intersected by a transverse bore 30 forming a fuel passage which allows a certain amount of fuel "I'll to pass through the valve to the high speed c nozzle at all times and the calibration of the bores 29 and 30 forming the fuel passage in respect to the size of the high speed nozzle is such that when the carburetor is runningat intermediate speed, the high speed nozzle is not supplied with fuel to its full capacity.

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As the speed of the motor increases by the opening of the throttle, the valve is unseated so as to supply the high speed nozzle with its full capacity of fuel and in the drawing it will be noted that I have shown a certain amount of slack in the wire 24 connecting the fuel valve to the throttle valve so that the throttle is allowed to move a predetermined distance before the valve is unseated to supply additional fuel to the high speed nozzle.

While I have shown certain details of construction for controlling the supply of fuel to the high speed nozzle of a carburetor in Which a nozzle is disposed under a suction controlled valve which is normally held seated by spring tension, I am aware that the valve can be constructed in different ways and controlled by operating means of various forms actuated by the movement of the throttle valve, therefore I do not wish to limit myself to the details of construction of the valve and operating means as my invention consists broadly in providing a carburetor with a suction controlled valve having a fuel nozzle disposed under the same having a fuel passage of such a size that when the engine to which the carburetor is attached is running at intermediate speed, the fuel supplied is less than the full capacity of the nozzle and as the speed increases the high speed nozzle is supplied with fuel to its full capacity so as to provide for quick acceleration at high speed by increasing the richness of the mixture at the time desired, 'which in turn is controlled by the movement of the throttle of the carburetor.

From the foregoing description it will be seen that I have provideda carburetor with ahi eh and low s )eed nozzle,the supply of fuel to the low speed nozzle being controlled by a manually operated valve and the supply of fuel to the high speed nozzle being controlled by a throttle operated valve so constructed that at intermediate throttle position, the high s eed nozzle delivers a minimum amount of fue to the mixing chamber thereof and at high speed a maximum amount of fuel whereby a carburetor is )rovided so constructed that it meets the demand required in the general. type of motor vehicle now in use, by providing means for quick acceleration and increased richness of mixture at high 5 eed.,

In the specification and drawing have shown and described a carburetor with high and low speed nozzles provided with means for supplying fuel thereto in connection with means for regulating the supply of fuel to the high speed nozzle by the movement of the throttle valve, but it is, of course, understood that various other constructions for accomplishing this result can be used without departing from the spirit of my invention as defined by the claims and therefore I do not wish to limit myself to the details of construction shown.

What I claim is 1. A carburetor having high and low speed nozzles, a throttle valve, a source of supply having passages leading to said nozzles, a valve for controlling the amount of fuel delivered to the high speed nozzle, said valve having a passage therein for allowing a minimum amount of fuel to pass to said high speed nozzle and means operated by the movement of the throttle for actuating said valve for supplying the maximum amount of fuel to said high speed nozzle.

2. A carburetor'comprising a body having a bore provided with a lateral air inlet at its lower end and a throttle valve at its upper end, a low speed nozzle mounted in said bore,

a high speed nozzle arranged in said core, a suction controlled valve mounted in said bore over said high speed nozzle, a fuel bowl for supplying fuel to said nozzles, a valve for controlling the supply of fuel to said high speed nozzle, said valve having a fuel passage for allowing a minimum amount of fuel to pass to said high speed nozzle and means operated by the movement of the throttle for unseating said valve for allowing a maximum amount of fuel to pass to said high speed nozzle, said means being operated by the movement of the throttle.

3. A carburetor comprising a body having a bore provided with an air inlet at its lower end and a throttle controlled outlet, a member arranged in the lower end of said bore having an air passage provided with a low speed nozzle, a pivoted suction controlled valve carried b said member, a high speed nozzle carried y said member and terminating adjacent the free end of said suction controlled valve, a fuel bowl carried by said member, fuel passages extending from said fuel bowl to said nozzles, a valve disposed in the fuel passage leading to the high speed nozzle and having a fuel passage therein for allowing a minimum amount of fuel to pass therethrough and means for connecting said fuel valve to the throttle valve to move said fuel valve for allowing a maximum amount of fuel to pass th'erethrough upon the movement of said throttle valve.

.4. A carburetor comprising a body having,

low and high speed nozzles, a fuel bowl, a

. pivoted suction controlled valve arranged over the high speed nozzle, a fuel passage extending from said bowl to said low speed nozzle, a valve casing, a fuel passage extending from said fuel bowl to said valve casing, a fuel passage extending from said valve casing to said high speed nozzle, a valve arranged in said valve casing and having a fuel passage therein for allowing a predetermined ,amount of fuel to pass therethrough, means for holding said valve seated and means operated by the movement of the throttle for unseating said valve to increase the amount of fuel passing to said high speed nozzle.

valve to said throttle valve to be moved thereby for increasing the supply of fuel to said high speed nozzle'by the movement of 'the throttle valve. I

6. A carburetor comprising a body having a throttle controlled outlet, high and low speed nozzles arranged within said body, a suction controlled valve arranged over said high speed nozzle, a fuel bowl for supply-- ing fuel to said nozzles, a valve casing in communication with the source of fuel supply to said high speed nozzle, a valve mounted therein having a passage therein for allowing a predetermined amount of fuel to pass therethrough and a connection between said valve and said throttle for unseating said valve to increase the supply of fuel to the high speed nozzle.

nozzle at intermediate (1 and a maximum amount of fuel to said 'gh speed nozzle at high speed.

10. A carburetor having high and low speed nozzles, a throttle valve, a source of supply having passages leading to said nozzle, a suction controlled valve arranged over said high speed nozzle, a valve controlljn the amount of fuel delivered to ,said hig speed nozzle, said valve having a' passage therein for allowing a minimum amount of fuel to pass to sai high speed nozzle and means controlled by the position of the throttle valve for actuating said valve for su plying a maximum amount of fuel to said hi h speed nozzle.

n testimony whereof I hereunto afiix my signature.

.WALTER G. HEGINBOTTOM.

7. A carburetor having high and low speed nozzles and a suction controlled valve arranged over said high speed nozzle, a throttle valve and means for controlling the supply of fuel to said high speed nozzle comprising a valve having a passage therein for delivering a minimum amount of fuel when seated and a maximum amount of fuel when unseated and means connected to and operated by the movement of the throttle for unseating said valve.

8. A carburetor having high and low' speed nozzles and a throttle valve for controlling the outlet thereof, means for supplying fuel to said high and low speed nozz es, a valve for controlling the supply of fuel to said high speed nozzle and having a fuel passage therein for supplying, a minimum I,

amount of fuel to said nozzle when seated and a maximumamount of fuel when unseated and means actuated at a predetermined movement of the throttle for unseating said valve for increasing the supply of fuel to said high speed nozzle.

9. A carburetor having a c'arbureting passage, a throttle valve for controlling the pasage of explosive mixture therethrough, a low speed nozzle for constantly supplying fuel to said carbureting passage, a high speed nozzle for supplying fuel to said carbureting passage at intermediate and high speeds, means for supplying and maintaining 'fuel at a predetermined level in said high Speed nozzle and means controlled by the position of the throttle valve for controlling the amount of fuel delivered to the highspeed nozzle, said means comprising a valve having a passage therein adapted to deliver a minimum amount of fuel to said high speed

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