US1631923A - Carburetor - Google Patents

Description

F. DAY

June 7,1927. 1,631,923.

CARBURETOR Filed March 1, 1924 2 Sheets-Sheet l INVENTOR WITNESS: ATT RN Y Patented June 7, 19 27 gu m Bur-ES FRED DAY, or, Amman, SOUTH'DAKOTA;

. tion B, and the gasolinepassing NT OFFICE cnuwim'ron.

Appl ication filed March. 1;. 1924. snal No. ceases. I I

This: invention relates. :to carburet orspand ,tllQkOl'JjQCt is to provide a particulareecontml .ot the valvesby the float, and by reasonlof (JOI'lllQj'tiOllS permitting reduced air pressure,

under, theconditions disclosed in the descri rv tion of, the construction in; detail. 7

A .turtlie1' object is toprovide an apparatus making unnecessary, the use of a separate vacuunitanli.

11With the foregoing and other objects in view the invention. consists in the novel construction and;arrangement. of elements; described, illustrated, and claimed, it being un-- derstood that n]O(1lfiC21tlOnS;I1lfly bemade withintlie scope of the claims without departingifrom the spirit of the, invention.

Tn tliemliawings,Figure liis a view of the-carburetor in vertical section; Figure2 is a eectionof thehand operated eleu'ientdor controlling needle valve 88; Figure 3 is a detail view showing a port through the wall of chamber 63 at. the lowerrighthand portion of: Figure 1; Figure 4 is; a section. on line 49 l. of Figure 1; Figure 5 is a section on line 5 5 of Figure 4. i v

The, main casing, includes. theaupper section A and a lowersection B, these sections being connected at C3, and taperedportionH of the upper section fitting the lower section atyH, where there is a corresponding taper adj acent to the air inlet valve 66 reterred to below. Afloat chamber having Walls 11 is spaced'above the shell of the lower seefrom the float chamber into the bottom 0 section B enters the mixing chamber through the path .to .bedescribed in more detail. Sediment is drained off when requiredgat D; Gaskets E, F, G are located as shown,.to prevent leakage. i y

Float 12 isrigid with stem .13 'havinga bore 1 L in its lower end loosely fitting the ireduced end 15 of a screwi lti holdinga loosely mounted disk valve 17. ,M'lhi's valve 17 closes ports 18 through which gasolinepasses from chamber 10 to the bottom B ofsectionB. Disk valve 17 loosely fits bore 19 and screw 16 isprovided. with a shoulder 19", to prevent itwiirom being screwed u against the valve. A gasoline intakezduct20, is connected with cap 21 ofchamber 21, the ca having an' angular" portion (Fig. .2) ,y or' engagement by atool, and duct-20 eommunicates with chamber 21- in which screen 22 is mounted. ;T he fuel passes through ort 23 to cha1nber.24,and tOVfllVQ cham er 25.

closed by a valve 26. This valve isitria'ngu- 'lar 1n cross section, has a tapered, endseating at .27, and a-rounded lower end engaged by arm 28 pivoted at' 29. .The. arm is engaged air displacedby the gasoline'to pass out,

so that the passageoftuel around valved? will not be obstructed. ()verflow port I? at the right of Figure 1 prevents an. overcharge oflgasoline, any lowedtorun ofil- Alarge .valve 33 is slidable vertically on.

the stem 13 and loosely fits casing or Challiber 34. This valve includes tubular por- .tion 35 having an internalishoulder 36 engaged by coiled spring 37.1ocatedbetween raise the valve. 1 i 7 Valve 33 has an upperbore 39.. loosely receivinga valve,4l0 seated. at A1 and ,co n trolling. the admission-of air. through ports '60 by. disk 30 on stem 13 of the float. Port P :ofzFig. 6 leads from chamber 63, and allows surplus beingi'ral- 7 42, here 39 and; ports 43:i11..tuhular portion 1 .35. .IValve 40 issquare..in1 .cross section,

hasan upperslot l l for engagement by a tool inserted through an opening aclosedv by cap 45 and thisvalve is threaded on to'the upper end of stem 13.

- .alve'133 seats at 33 having an wlIpPQI. flange 46 controlling the passage around the valveat the upperendo valve chamber ,34. Below cap;45 is a chamber48 incommunication with the outerair;through ports: 42.

In the side of valvechamber '3Lis aport 49 communicating byJneans-of ductor tube 50 with housing 51 of throttlevalve52; and on the side toward the engine. The stem 53 of this valve iscontrolled byitlllll :54, and

a short, arm 55 contacts 1witlr'a screw 56 mounted in lug 57-and constituting an :ad-

.justable stop for the valve.

The main air intake 60 lSdIl/COlDlnUl'llCfltion with chamber 615 partly irounded ns shown, and separated :by diaphragm 62 from lower chamber, 163 inlower casing el ement Between; chamber 61 and mixing chamber 64 is; a valve seat 65 where a main valve 166 seats. This valve includes cylindrical portions 67, .68, the latterihavingports 69.leading ,to: chamber 6% and having threaded connection with; theuppe'r end of stem IOpro+ vided. wi h alpns d m her .7 .A Por 72 leads from this bore to space Y71 and registering ports 73, 74-. lead to space 75 between cylindrical portion 67 and sleeve 7 6 having a reduced upper end threaded to stem 71. This sleeve 76, is concentric with stationary cylindrical element- 78 on dia-' phragm 62, and element 78 guides stem 71, as well as the sleeve.

A stationary tubular member 80 incloses the lower part of stem 70, and a plug sleeve 81 is threaded into member 80, passing through the bottom 13. Elements 80 and 81 have registering ports 82, 83 permitting gasoline to enter the lower-end of hollow stem 70 and pass upwardly to port 72. The lower end of stem 70 is smaller than sleeve 81 and includes a spiral rib 8 1 engaging stationary washer 85 and preventing vibration of the stem vertically.

Needle valve 88 controls port 72 in hollow stem 70 and is mounted in cylindrical member 89 having an upper flange engaged by coiled expansion-spring 90 hearing on member 68 of valve 06. A controlling wire 91 engages member 89 and passes through tube 92 entering a plug sleeve 93 threaded into casing member A and retained by nut 9%. Element or plunger 89 operates in bore 95 of member A of the casing. "he tube 92 is retained by cap 96 threaded on to the end of sleeve 93 and acting to compress \vasilher 97 against the tube. Element 93 has fiat sides at one point, to permit of adjustment by a wrench. 7

Wire 91 is operated by knob or disk 100 rigid with stem 101 slidable in sleeve 102, the Wire being retained in the stem b Y set screw 103 which forces the Wire into recess 104;. The head of the screwl03 engages a stud 105 under the action of spring 106, preventing displacement of the stem. A channel 107 in the stem permits the movement of the latter with reference to the stud and provides a guide. Tube 92 is connected with sleeve 102,;in the manner shown at 108, the conn'ectionbeing similar to that at the other end of tube 92.

Needle valve 88 is therefore controlled by pressure or knob 100, by the operator,tl1e movement being transmitted through spring Wire 91. The needle valve being gradually tapered as shown, permits of delicate control of port 72, admitting fuel.

Assuming that float 12 is down, valves 33 and 410 are closed, and the carburetor requires more gas0line,engine suction through port 49 will draw in fuel through screen 22, and, it will pass open valve 26 to float chamber 10, the suction in the" latter holding lower valve-1'7 closed for the time.

Suflicient gasoline havingjentered, float 12 will rise, valve 26 will close, and small valve 10 on the stem of the float will open because of the rise of the float. Air will then pass through ports 42 and chamber l8,

through the bore around valve 40, and through ports 43 to chamber 10, The resulting elimination of suction will permit large valve 33 to rise under the action of its spring. Engine suction is however too strong to permit valve 33 to rise until air has entered through small valve 40 and reieved the suction, partially.

Suction on lower valve 17 being relieved, that valve Will drop to open position, and allow gasoline to flow to B, and thence to ports 82, 83,'and up through hollow stem 70. 1

After passing port 72 in stem 70 (the port being controlled by needle valve 88), the gasoline is mixed with air entering at 73, .741, 7 5,'the mixture emerging through ports 69 into chamber 6 1, where it is further combined with air entering at 65 and passing large valve 66. From chamber 64: the fuel passes throttle valve 52 to the engine, and the speed of the latter and the suction produced determines the extent of opening of valve 60. 88, or tlie'reduced end thereof permits more gasoline to pass port 72, to meet the demands of the engine. For priming, pressure on knob 100 produces thrust on elements 91, 89 and 88 for the purpose desired.

\Vhat IIclaim is: e

11. In a device of theclass described, a float chamber, a float therein, a reduced air pressure connection for the chamber, a fuel inlet and an air inlet for the chamber, a tubular air inlet valve, a stem for the, float,

said stein passing through the valve, a valve 2 on the stem controlling the passage'of air throu 'h the tubular valve to the chamber,

lVhen valve 66 rises, needle valve and controlling the movement of the tubular valve in one direction, and a spring for opening the tubular valve and admitting additional air to the chamber after the tubular valve has been released by the valve on the stem; y

2. In a carburetor, a float chamber, a float therein, a reduced air pressure connection for the chamber, a fuel inlet and an air inlet for the chamber, a tubular air inlet valve, a stem for the float, said stem passing thru the valve, a valve on the stem controlling the passage of air thru the tubular valve to the chamber and controlling the movementlof the tubular valve in one direction, a spring for opening the tubular valve and admitting additional air to the chamber after the tubular valve has been released by the valve on the stem, means for closing the fuel inlet valve upon the lifting of the float and stem, and means operated by the stem controlling the passage of fuel from the float chamber.

In testimony whereof I allix my signature.

FRED DAY.

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