US1760595A - Carburetor - Google Patents

Description

y 1930- w. A. HEIDE 1,760,595

CARBURETOR Filed April 19, 1923 2 Sheets-Sheet 1 May 27, 1930. r w HElDE 1,760,595

CARiBURETOR Filed April 19, 1925 2 Sheets-Sheet 2 Patented May 27, 1930 WILL AM A..HE1DE, or emon, MICHIGAN PATENT, QFHCE csnnnnnron Application filed April 19,

This invention relates. to carburetors. It 1s an ob ectof the inventlon to provide a carburetorhaving novel controlling means whereby the engine canbe primed readily for.

the. purpose of startingit and whereby the flow of air and fuel can be controlled effectively under various circumstances.

1 Another object is toprovide novel means for controllingthe flow of air past the fuel a nozzle, for reducing the inflow of air and for otherwise controlling the flow of air and gas through the carburetor.

With the foregoing and other objects in view which will appear as the description proceeds, the invention consists of certain novel details of construction and combinationsof parts which willbe hereinafter more fully described and pointed outin the claim, it being understood that changes may be made in the construction and arrangement of the parts without departing from the invention as. shown.

In the accompanying drawings the pre ferred forms of the. invention have been shown. y l w r In said drawings, Figure 1 is a plan view of the improved carburetor, portions being shown 'in section.

Figure -2 is a vertical media-n section on the line 2-2 of Figure 1.,portions being shown in elevation; 1 Figure 3 isaqplairview of theair choke valve. Figure 4; is ahor-izontal section on the lines the spirit of gFigureoisa fragmental side elevation illustrating the operatingineans of the air choke valve and corresponding parts.

' l Figure 6 isaf vertical section of a modified form of carburetor, -port1o11sbe1ng shown 1n 'elevationhm h u, y u In carryingfgouu the lIlVGIltlOIl, referrlng particularly to Figures 1 to .5, inclusive, there is provided a fuel receptacle or cup 1 havmg securedupon itsrim a-removahle cover 2,

which .haslseated thereon and extending. dia

metrically across the same,ithe horizontallair 1923. Slcl'ial No. 633,210.

combustion engine. The receptacle 1 is pro-v vided at a suitable point thereof above'the fuel level with an air vent aperture 5, and the pipe 3 can be secured upon the cover by means of one or more screws 6 engaged. 1113-. wardly through the cover and threadedly en-v gaging the pipe.

A fuel cup 7 is engaged upwardly through a central opening in the cover 2 and is thread: ed .upwardlythrough the bottom of the pipe 3 intermediate the ends thereof, said cup having an outstanding flange 7 bearing upwardly against the cover 2. A fuel nozzle or tube 8 depends. from the bottom ofthe cup7 centrally thereof to dip in the fuel within the receptacle 1, and the flow. of fuel from the receptacle into the lower end of the tube 8 is controlled by means of a valve 10 seatable against and cooperable with the lower end of the tube. The valve 10 is carried by and extends upwardly from the intermediate portion of a lever 12 within the receptacle 1.

means. For example a screw 16 or its Y equivalent can-be used for engaginguthe stein and the lug 11 can be split as at 17.

This split portion has a screw 18 whereby it canbe contracted about the stem 15 so as to r grip the same. Obviously by looseningjthe stem and rotating it the threaded end thereof will work in lever 12 and move the valve 10 toward or from its seat. Thus the flow of fuel through thetubeS and into the cup 7 can be regulated. See my. co-pending-application Serial No. 379,541, filed May 7 1920.

' An air suctionmemberfi is. fitted within the pipe3f,andtheriniofthe fuel cup 7 is threade-d upwardly into said member 9, said memher providing a constricted portion of the air suction passage with which the mouth of the fuelcup communicates. The Lug is premded near one end with a fuel inlet passage 19, and a fuel supply pipe 19' is connected to the lug in communication with the passage 19, and withthe receptacle 1, to deliver the fuel into said receptacle.

In order to maintain the fuel level normal within the receptacle 1, a float 20 is provided therein, having an opening 22 through which the 'fuel tube 8 extends loosely. This float carries the usual valve adapted to engage the valve seat at the end of the fuel inlet passage 19 and thus control the passage of fuel through the inlet.

A throttle valve 26 of the butterfly type is mounted Within the discharge end of the ipe 3 and is carried by a vertical spindle 27 1ournaled through said pipe, said spindle having an operating arm 28 at its upper end adapted to be controlled manually in any suitable manner, whereby the engine can be throttled as usual. The throttle valve 26 controls the air suction within the pipe 3, to thereby controlthe amount of fuel used.

As a means for supplying a priming charge of fuel to the air flowing from the pipe 3, when the engine is started, a tube 29 is provided, one end extending within and communicating with the lower portion of the rece tacle 1, said tube extending through one si e of the receptacle, and having its other end soldered or otherwise secured to one side of the pipe 3 adjacent to the discharge end thereof and adjacent to or slightly In ad Vance of the throttlevalve. The adjacent portions of the pipe 3 and tube 29 are provided with an oblique aperture 30 extending in the general direction of the flow of air through the pipe, and said aperture is located adjacent to and immediately in advance of the throttle valve, one edge or wing-of said valve being disposedimmediately adjacent to or behind, the aperture 30 when the valve is closed, and being cut away, as at 31, to provide a by-pass between said wing of the valve and side wall of thepipe 3 wh-en'the valve is closed. This allows a small current of air to ass through the bypass past the valve and aperture 30, the suction extending through the aperture 30 into thetube 29, where y when'the engine is started, with the throttle valve 26 closed or near closed position, apriming eharge'of'fuel will be sucked from the tube 29 into themanifoldto start the engine easily.

The air choke andcontrolling valve 32 extends into the air choke member 9 from the receiving end thereof toward the mouth of the cup 7, with the free end'of said valve swingable toward and away from themouth of said cup. The valve 32 is pivoted, as at 33,

within the member 9 diagonally opposite to the cup 7, said valve being pivoted between its ends, and its other end portion is swingable withina' slot 34 with which the member 9 is'provided, and a longitudinal, slot 35 in.

the top of the pipe 3, above the slot The valve 32 which normally extends downwardly at an angle to the cup 7, is provided with an elongated longitudinal opening or slot 36, normally closed by a leaf spring valve 37 hearing against the lower surface of the valve 32 and secured, as at 38, to the valve 32 adjacent to its free end. The valve 37 is held seated against the valve 32 by its spring tension, so as to ordinarily close the opening 36, but in case of a back fire in the engine, resulting in'the reverse flow of air and gas through the pipe 3, the choke valve 32 being closed, will enable the compressed air and gas to escape through the opening 36, the valve 37 bein sprung open downwardly away from the valve 32. The valve 37 and opening 36 can be eliminated if not wanted.

As a means for operating and controlling the choke valve 32, a forwardly extending arm 39 is disposed snugly within the opening or slot 35 and its rear end is mounted upon a rock shaft 40, it being secured thereto by means of a pin 41 or otherwise, and said rock shaft is journaled through upstanding flanges or bearings 42 with which the pipe 3 is provided at opposite sides of the opening 35. The forward portion of the arm 39 extends upwardly at an angle, as at 43, so that the upper terminal of the valve 32 can seat upwardly thereagainst, as seen in Figure 2. The inclined portion 43 is provided at the end of the arm 39 and side edges of the portion 43 with the depending aprons 44 and 45, respectively, to snugly fit the pipe 3 around the opening35 for preventing leakage when the arm 39 is swung downwardly against the pipe 3. The upper terminal of the valve 32 is held yieldably against the portion 43 of the arm 29, and for this purpose, a stem 46 is slidable through said portion 43 and extends through an open slot 47 with which the upper terminal of the valve 32 is provided, said stem 46 having a head 48 at its lower end seating upwardly against the upper terminal of the valve 32. A coiled wire expansion spring 49 surrounds, the stem 46 above the arm 39, and is confined between the portion 43 andan adjustable nut 50 threaded upon the stem. Said nut can be rotated for adj usting the tension of the spring-49 to thereby hold the upper terminal or arm of the valve 32 against the portion 43 with the desired tension. A stop screw 51 is threaded through the arm 39 between its pivoted end and portion43 to limit the movement of the upper terminal of the valve 32 toward the arm 39, said stop screw 51 being held in any adjusted position by means of a lock nut 52 thereon. When the arm39 is swung downwardly against the pipe 3, this will hold the valve 32in inclined position so asto extend rearvrardly and downwardly to the mouth of the cup 7, as seen in Figure 2,but the rear lower terminal of the valve32 can swing upwardly, due to the air suction, which will upwardly, the stem 46 is moved yieldably with the arm,tl1ereby pulling the upper terminal of the valve 32 with the arm 39 and swinging the lower active terminal Off/lie va1ve32 downwardly against the bottom of the member 9,to shutoff the flow of air or choke the air suction passage, thereby reducing orrestricting the flow of air into said passage" y The arm 39is operated by means of a lever 53 secured upon one terminal of the rock shaft by meansof a set screw 54 or otherwise, and having an upwardly extending arm 55 to which a rod or link is connected for operationby afoot. or hand lever or other oper ating member. The lever 53has another arm 56 to which an adjusting screw 57 is threaded, said screw belng held 1n any adgusted position by means of a lock nut 58 thereon.

Thelower end of the screw 57 bears upon a 1 disk 59 seating upon the upper convolution of a coiled wire compression spring 60 hav- W ing its lower convolution held upon the cover 2 by means of a suitable seat 61. The spring 6O inexpanding will raise the arm 56 whereby to turn the shaft 40 for swinging the arm 39 downwardly, and by swinging the arm 55 rearwardly, this will raise the arm 39.

The flow of fuel into the pipe 29 is controlled by a valve 62 seatable against the inner end .63 of said pipe, as seen in Figure 4,

the valve 62 preferably having a pin 64 ex tending into the pipe 29 for guiding the valve to its seat. The valve 62 is carried by a stem 65 that is pivoted to a radial arm 66 carried by a vertical rock shaft 67 mounted for rotation within the receptacle in any suitable manner, and extending up through the cover 2 thereof. A sultable spring 68 tends to swing the arm 66 toward the pipe 29 for seating] the valve 62, and a lever 69 is secured upon the upper protruding terminal of the rock Slllfl3,$&1d lever having a split portion 7 O embracingthe shaft and carrying a clamps ing screw 71 for tightly securing the lever to the shaft. The lever has an outstanding arm 72 whereby it can be swung through the medium of a suitableoperating device. The lever has an inwardly extending arm 73 pro jeoting below the rock shaft $0 to beengaged by the downwardlyextending arm 74 of the x lever 53, whereby when the arm 55 is swung rearwardly to completely close the valve 32,

i the arm 7 4 in striking the arm 7 3 will swing the lever 69. This will swing the arm 66 away from the tube 29 to open the valve 62 so that the fuel-can 'flowinto said tube.

In operation, whenthe lever 53 is released,

it will be swung under the influence of the spring 60 to. swingthe arm 39 downwardly against the pipe 3, and the choke valve 32 Willtherefore swing partially open, as seen in Figure 2, while the lever 69 is released'to permit the valve 62 to close under the influence of the spring 68. Thisprevents the flow of fuel through the tube 29 excepting when the valve 32 is closed. It will be noted that the valve 32 in extending at an angle to the mouth of the cup 7, will dire-ct all of the air across the mouth of saidcup, thereby creating an air suction andoddies within the cup to effectively atomize and mix the fuel and air, the fuel being sucked upwardly through the tube ornozzleS into the cup 7 and pipe 3 and passing ofi withthe air. As

the suction increases, to increase the volume of air flowing through the pipe 3, the lower free end of the valve 32 can swing upwardly away from thecup 7, but it will be noted that in doing so, the spring 49 is compressed, thereby resulting in the air being constrained to pass closely over the cup v7. The normal position ofthe valve 32 can be controlled by adjusting the stop screw 51. Thus, with the a "m 39in normal position by adjustingthe screw 51 downwardly, this will raise the lower end of the valve 32. The engine is throttled as usual by means of a throttle valve'26.

Tn starting the engine, the arm 55 of the lever 53 is swung forwardly, whereby to raise the arm 39 andyieldably swing the upper terminal-of the valve 32 upwardly, to close the said valve and bring the lower free end thereof against the bottom of the air of the spring 49, when the tension of said spring is overcome, but whenthe arm 39 is raised, the spring 49 will result in the valve 32 being held closed with considerable tension. Should there be a back lireof the engine, resulting in the reverse flow of air" and noted that the upper free terminal of ,the

valve 37 will spring downwardly first, so

thatthe air and gas will flow through the upper portion of the openin :36, being direct: ed upwardlyaway fromthe. cup 7 by the valve 32, so that the reverseflow of air and gas through the pipe 3. will notresultih an appreciable amount of fuel being drawn from the cup 7 and wasted. The valve 32 although it causes the infiowing air to pass immediately across the mouth of the cup 7, will deflect the outflowing air away from said cup, with the foregoing advantages derived by such function of the valve 32 The modification illustrated in Figure 6 uses the same arrangement of valve 10, lever 12, and their operating means, as already described with reference to the structure shown in Figures 1 to 5 inclusive. In this form, however, the air suction pipe 3 extends vertically through the receptacle or reservoir 1 having the cover 2" mounted upon said pipe, the bottom of the receptacle being threadedly or otherwise engaged upon the lower terminal of the pipe 3 to bring the rim of the receptacle against the cover, a suitable packing 3" being proi'ided between the bottom of the receptacle and pipe 3*. .The pipe 3 has a laterally extending branch 3 above the cover 2 in which an air choke nienr.

her 9' is disposed, similar to the member 9 above described, and having assembled therewith, the fuel cup 7 and a simple air choke valve 32 held closed over the cup 7 by a spring 49 between the branch 8* and nut 50 on rod 46. This valve 32 normally closes the branch 3 when the suction is low and opens as the suction increases. A second depend ing fuel tube 8 is provided, the same having its upper end attached to one side of the pipe 3' underneath the cover 2 and communicating with a fuel cup or recess 7' with which the air choke member 9" within the pipe 3 below the branch 3 is'provided. Separate valves 10 and 10" are provided for the tubes 8 and 8*, and can be controlled in any suitable manner. The float surrounds the pipe 3 within the receptacle, and is hinged, as at 21, to the cover which has alug 11' above the hinged portion of the float provided with the fuel inlet port 19 and a valve seat 19 at the lower end of the port 19 against which the valve 22 is seatable upwardly. Said valve is connected to the hinge member 25 upon the float 20. The fuel supply tube 19' is connected to an attaching member secured on the lug 11' and having a conical ground fit therewith. A priming fuel tube 29 extends up wardly through the cover along the pipe 3 and the flow of the fuel into the lower end of said tube is controlled by a valve 62 and operating device therefor similar to the corresponding parts above described. The upper end of the tube 29 opens into the pipe 3, as at30, immediately above the throttle valve 26 mounted within the -upper portion of the pipe 39 above the branch 27. The shaft 67 and spring 68 are carried by a bracket 67 attached to pipe 3 .v

' What is claimed is:

- A carburetor including a fuel receptacle, a

cover thereon, a suction pipe extending across the receptacle and downwardly through the cover and the bottom of the receptacle, said suction pipe constituting means for holding the cover assembled with the receptacle, an intake choke member within the suction pipe, a fuel tube in the receptacle, a screwthreaded enlargement at one end of the tube recessed to provide a cup opening downwardly into the tube and upwardly into the choke member, said enlargement being in threaded engagement with the top of the receptacle, the suction pipe, and the choke member for holding them assembled and for supporting the fuel tube in the receptacle, a valve pivotally mounted in the choke member, one end portion of the valve bein adapt ed to extend over the cup, and means for actuating the valve,

In testimony that I claim the foregoing as my own, I have hereto aflixed my signature.

WILLIAM A. HEIDE.

Images