US1627845A

US1627845A - Carburetor

Info

Publication number: US1627845A
Application number: US603637A
Authority: US
Inventors: Grikscheit William
Original assignee: Individual
Current assignee: Individual
Priority date: 1922-11-27
Filing date: 1922-11-27
Publication date: 1927-05-10
Anticipated expiration: 1944-05-10

Description

Patented May 10, l1927. i

WILLIAM GRIKSGHEIT, OE; DETROIT,` MIGHIGAN,

` .marmer-.0a

Applcatqnzlevd November 27192,2,v- Serilali-No.z603,637

AThe:` invention Arelates to carburetor's vand yhas-for its mainobject,theprovisionwof a carburetor. ,hpa-ving. faynozzle V comin unieating ywith .the carburetor l outlet and Y extending into the. float. chamber, and `means,,within the float chamber and dependentupen-lthev suction elfectfof the fnozzleto effect'tlfielflow of A. liquid fuell intoy .the 1ioat cl'iamberv from a lowerlevel. Another object is'to ,provide .a` carburetor which can I-jbev readilyA adjusted to. ,op,e`rate,as -agravityfeedtype of carburetor in which thefliquid fuel flOWsinto the. float: chamber from. afhigherjlevel.

Ahlurtlier objects ofthe invention Areside in .the novel features-of constructionyanjd.coinbinations and. arrangementl of parts as incre ful-ly hereinafter setffortlrV Inf'the drawings:y f y Higures. l andV 2 yare. transverse cross VSec- .tionsffthlo-ugh. cairburetor1 embodying my inventiontaken oii'the lines 11-'1a'nd 2,-2.

respectively e V llfigure-f3zisxacross 'section on 'the 'line 3-'3 of Figure 1.

1 is the outlet in the carburetor body and 2the primary air inlet communicating there-l with, both the outlet and inlet extending laterally with the inlet slightly lower than the outlet. 3 is the throttle valve in the outlet, and 4 the choke valve in the inlet.

5 is a tube depending into `the float chamber f 6 located below the outlet and inlet, and 7 is an upper tube telescopically engaging in the enlarged upper portion 8 of the tube 5. These two tubes form the fuel discharge conduit of the carburetor, the lower end of the tube 5 being open and the rear portion of the wall of the tube 7 having longitudinally spaced openings 9 for placing the interior of the tube in communication with the outlet 1. 10 is a fuel valve extending axially through the tubes 5 and 7 and also through the opening 11 in the bottom of the cup 12. y 13 is a vertically reciprocable plunger within the cylinder 14 formed in the carburetor body and sc located that the plunger in the primary air inlet, while the pressure vvalve through ythe', restrictedequalizing passage 415. The loweri'nostposition @if the plunger is `determi/ned'by means .fofthe coil ably engaging vthe borel 18y y'in'l the plunger. 'lhejlower.,V end of fthek ,plunger .witht eke l'cepfcionV offthe rear portion is preferably "formed at an .angle,land the rear' loweifeii'il portionis spaced abovei ythe upper A4end of 'the ,tuba-5. Ywhen thepluilei'- isili its. lener- `mest position. l Also, the. upper ltube..7lras an;A opening 9. in communication withl the outlet-when the plijinger'isiin its lowerilnost position.

"y Thelfuel valvelO yand lalso theupper tube 7V are .secured tothe plunger .lto be.` raised and' lowered' therewith the arrangement v besuch that as, the plunger rises, tlrepef- "f-ective area ofthe olaenihg'llinc'reases as vdoes also the effective areas of the discharge openings 9. Furthermore, the effective area of the passage for the primary air entering the outlet increases.

To secure the flow of liquid fuel into the float chamber from a lower level, and in the present inst-ance from the liquid fuel supply air-vented tank 19 which is located below the carburetor, the cup 12 within the float chamber has an open upper end located above the llevel of the liquid fuel within the float chamber. and the bottom of this cup which is preferably rounded, located at a slight distance from the lower end of the tube 5. This cup is mounted upon the hollow support 20 which has the. lateral openings 21 in its wall for placing the interior of the float chamber in communication with the opening 11 in the bottom of the cup. There is also the air vent opening 22 communicating with the vertical passage 23, which latter communicates with the interior of the float chamber through the lateral opening 24 near its bottom. The passage 23 is formed in 'a vertically extending boss V25 at one side of the float chamber, and the air vent opening 22 is located above the level of the liquid fuel in the float chamber. 26 is a suitable float connected to thek control valve 27 for maintaining a constant level in the float chan'iber.

ln operation, the suction effect in the outlet l below the throttle valve 3 which is produced by the suction producing means of the carburetor is transmitted through the eX- posed opening or openings 9 in the upper tube 7, thereby drawing the liquid fuel from the float chamber through the openings 21 and ll into the fuel discharge conduit, since air is admitted into the float chamber' through the opening 22, vertical passage 23, and opening 2f-l-l Also, the suction effect is transferred to the space within the float chamber above the level of the liquid fuel therewithin by means of the cup l2 which has an yopen upper end, this suction being sutlicient to draw the liquid fuel from the supply tanlr 19 into the float chamber through the intermediate pipe connection, the amountl of air entering the float chamber' through the air vent opening 22 being restricted sufficiently to permit of the necessary suction. It has been found desirable in practice to space the portion of the bottom of the cup 12 which is directly in line with the Wall of the tube 5 approximately of an inch below the lower end of this wall, and to make the opening 24 approximately of an inch in diameter.

The pressure in the outlet in rear of the throttle valve also controls the position of the plunger with the attached fuel valve and upper tube.

The cup may be vertically raised to bring its bottom into Contact With the lower end of the tube 5, at which time the carburetor is adapted to function as a gravity feed type of carburetor in which the liquid fuel flows into the iioat chamber from a higher level. This vertical adjustment of the cup may be secured by suitable means and as shown in the present instance is accomplished by means of the rock arm 28 engaging in a groove 29 inthe lower end of the support 20, the rock arm being mounted upon the shaft 30 which is actuated by the lever-,31 which may be actuated from a remote point by a suitable connection 32.

What l claim as my invention is:

In a carburetor, a mixing chamber, a constant level chamber, a tube fixed in the wall of said mixing chamber and extending into said constant level chamber, an adjustable cup in said constant level chamber surrounding said tube, said tube being open to the atmosphere and having a valve seat in its bottom, and a needle vvalve responsive to the depression in said mixing chamber egrtending through said tube to cooperate with said valve seat, so that adjustment of said cup simultaneously varies the free opening of the fuel vvpassage and the air passage between the end of said tube and the bottom of said cup.

In testimony whereof l aiiix my signature.

WILLIAM GrRlKSCHEIT.