US1482773A

US1482773A - Carburetor

Info

Publication number: US1482773A
Authority: US
Publication date: 1924-02-05
Anticipated expiration: 1941-02-05

Description

WA/ESSES a MAX/m3 Y 7 Feb. s., 1924, 1,482,773 E. L. WALT-ERS CARBURETOR Filed April 11. 191 v2 .Sheets-Sheet? Patented F eb. 5, 1924.

UNITED STATES PATENT OFFICE.

ELZA. L. WALTERS, OIE` ANDERSON, INDIANA.

CARBURETOR.

Application led April 11, 1919. Serial No. 289,226.

bustionengines forcreating a mixture of air and fuel which is utilized as the fuel medium for operating this type of engines.

The invention aims to provide a carburetor embodying a relatively small number lof parts and which whenk adjusted operates automatically at low, high or any intermediate speed, the valves automatically adapting themselves to the varying speeds so asV to produce a mixture ofY air and fuel which insures a nearly perfect combustion,

thereby preventing the accumulation of carbon.

The drawings illustrate a preferred ernbodiment of the invention. However, it is to be understood that in adapting the same to meet different conditions, various changes in the form, proportion,'and minor details of construction may be resortedto without departing from the nature of the invention as claimed hereinafter.

Referring; to the accompanying -drawings which illustrate a carburetor embodying the invention, Y

Figure 1 is a horizontal section through the mixing tube, the float chamber being shown in plan.

Figure 2 is an end elevation, the chamber being shown in section.

Figure 3 is an end elevation ofthe mixing tube partly broken away to show the stop for limiting the movement of the throttle.

y float Fig. 1 is a section of the float and parts` associated therewith on the line 4-4 of Fig. 2, the chamber being omitted.

Fig. 5v is an end elevation of the fuel valve, and

Fig. 6 is a section on the line 6-6 of float chamber 1 and a mixing` tube 2 which are connected in any suitable manner as by casting or by a bracket 3.

The float chamber 1 is closed at its top by means of a cover 4 in which is formed a threaded opening to receive the reduced externally threaded end of a tube 5. Slots 6 are formed in opposite sides of the inner or lower end of the tube 5 to receive a bar 7 which projects beyond opposite sides of the tube to engage. a float 8. The center portion of the bar 7 is widened and apertured to receive the lower pointed end of a valve 9 which controls the flow of the liquid fuel through the tube 5 into the float chamber. A valve seat 10 is formed at the inner end of the reduced portion of the tube 5 and the valve 9 closes upwardly thereagainst, the upper. end Aof the valve being pointed to enter the reduced portion of the tube 5 and the shoulder formed at the base of the reduced end constituting the valve proper which closes on the seat 10. The tube 5 remains fixed after beingadjusted, but the float 8 and valve 9 are movable and are controlled intheir movements by the change of level of the fuel in the chamber 1. A

1,1 supported in the lower end of the tube 5 has its end portions projecting to engage the float 8 and limit the downward movement of the float and the valve 9. The float 8 is freely movable on the tube 5 and the opening through which the tube 5 passes is provided with a metal lining or sleeve 12. The end portions of the bar 7 pass through the lining 12 and float 8, thereby serving to retain'the lining or sleeve 12 in position.

. VThe metal lining 12 prevents any binding of the floaton the tube 5. A thimble or coupling 13 is fitted in an opening formed in the bottom of the float chamber 1 and constitutes an outlet for the fuel. A pipe 14 connects with ythe coupling or thimble 13 and conveys the fuel from the float chamber to the mixing tube.

A pin 15 is .loosely mounted on the cover 4 and enables the carburetor to be primed when the valve 10 is unseated by the engagemcnt of the-pin 15 with the float 8. While the valve 10 is kept open, fuel will continue to flow into the chamber through the tube 5, consequently raising the level of the fuel in the mixing chamber, the over- Y flow being used for priming purposes.

Y bracket 17, which bracket is secured to the lever 16 is pivotally mounted vupon the projectingend of the tube by means of a nut 18. This nut-18 also acts as a binder to secure the tube 5 in adjusted position-in Vthe chamber 1. The lever 16 has one of its adapted to be operated by the usual control lever 'in a manner Well understood. A set screw 20 is threaded into the side of the mixing tube2 and maybe adjusted -to limit the movement of the throttle 19. A bushing 21 is threaded intothe opposite end of the mixing'tube 2 ,and adjustably receives a valve seat 22 which is kconnected thereto by means yo'f cooperating screw threads to per# mit adjustment of the valve seat 22 so as y air enters the tube24 and mixeswith the to enable the air valve 23 to be seated thereon with greater or less facility as may be required.

An air tube 24 is disposed centrally ofA the' mixing tube 2 and is supported by means cfa bridge 25 and yafuel nozzle 30 extending therethrough. 'The valve 23 is movable on theair tube 24 and is normally held seated 1 bymeans of an expansible helical spring 26 f other ends threaded and passing through the bushing 21. vNuts 28 are nsecured tothe threaded end of the rods 27 to hold the 'bridge in adjusted position.

Locking elements Y29 may be used to hold the nuts 28 in position by'vvedging said lelements 29 betvveenthe nuts 28 and the valve seat 22 as shown in Figure 2.

A fuel nozzle 30 Vextends through a side of the mixing tube 2 and va side of the air tube 241 and has its inner end terminating in an outlet 31 within the air tube 24. A small diagonal opening 31 is -provided at the rear "of the outlet to act as an additional ventfor thefuelvnozzle 30, said fuel nozzle having its outer end connected to the pipeV 14 to receive theV fuel from theicha'mber 1. A needle `valve 32 is connected lto the air Vvalve 23 to move therewith by a U-shaped rod 33 which .is adjustable on the air valve 23 so as to regulate' the fuel outlet vfor idlingor for constant low speed. The valve 32 is mounted at the closed end Yof the U-shaped rod'33 the free ends of said'rod lbeing threaded and passing through the bridge 25 and the valve 23. Nuts 34 are secured to the threaded endsV of the rod 33 to adjust said rod on said valve 23. Brackets 35 secured to the inner Walls of the mixing tube 2 act as guiding means in conjunction with the bridge 25 for the rod 33. 1

A fuel pipe, not shown, is adapted to be coupled with the projecting end of the tube 5 While the mixing tube 2 is adapted to be connected in any suitable manner to theintakemanifold ofthe engine. It is apparent that the several parts maybe properly adjusted by setting the tube 5, valve seat 22 and fuel valvev 32. The valve seat 22gmay be adjusted by turning it upon the bushing '21' whereby the air valve` 23 and needle valve "32 are Vmoved accordingly. Ifit is desired to' furtheradjust the needle valve 32 without moving the air Avalve 23,-sofas` to Vpermit a slovv'feeding of fuel therethrough for idling, said adjustment may bev made onv the rod 33 by the nuts 34. VIf it is desired to increase the tension of thespring 26 on the valve 23, the bridge 25 is movedfforward by'tightening the nuts 28 on the rods 27. Y Y

`When the engine is running at low speed fuel drawn from the outlet 3l. vAs thespeed of the engine increases the increased suction unseats the air valve23 more or less, thereby admitting'of a greater volume of air vbeing drav'n intothe lmixing tube. The unseating of the airvalve 23 effects proportionate opening of the valvef32, whereby more fuel lis supplied to mix with the greater volumel of air. This action is automatic as Will-be readily understood. The oat 8inth`e cham" fluting of the carburetor While at the 'same time assuring properl and ample supply of fuel When'the engine lis running atlow speed and when starting. Should theV float 8 or.` 'Y

valve 9 stick, the same may-be moved VKby operating the priming lever 16 ina manner well understood.

The foregoing description and thev draw- 'ings have reference to Vwhat maybe considered the preferred, or'approved form of.

my invention. It is to be understood that `I may make such Vchanges in construction and arrangement and combination of parts,

materials, dimensions, etcetera, as may prove expedient and fall Within thejso'ope of the appended claim. Y

Having thus fully described my inven--K` `tion, what I claimY las new and desire to secure by Letters Patent 1s:-` f v In a carburetor, a mixing tube having an air openino` an air tube means for supplyingfuu taeaa mbe, a au regnaang valve, a valve seat adjustable in the air openvalves and adapted tovbe guided in its move- 10 ing, an airk valve seated on the valve seat ment by said bridge.

and mounted on the air tube, an expansible In testimony whereof I alix my signature helical spring mounted on the air tube and in presence of two Witnesses.

a holding the air valve Seated, a bridge for supporting the air tube and engaging one ELZA L. WALTERS. end of the Spring, means for adjusting the Witnesses: v bridge to vary the tension of the spring and LOREN REED,

means adj ustably connecting the air and fuel J. O. PENISTEN.