US2699326A

US2699326A - Collar mounted dual actuated fuel feed device

Info

Publication number: US2699326A
Application number: US229064A
Authority: US
Inventors: David E Anderson; Carroll H Van Hartesveldt
Original assignee: Thompson Products Inc
Current assignee: Northrop Grumman Space and Mission Systems Corp
Priority date: 1951-05-31
Filing date: 1951-05-31
Publication date: 1955-01-11
Anticipated expiration: 1972-01-11

Description

Jan. 11, 1955 D. E. ANDERSON r-:TAL 2,699,326

COLLAR MOUNTED DUAL ACTUATED FUEL FEED DEVICE Filed May 31, 1951 I .yljj ,5? j! H 54 fy 'lin iig.,

United States Patent Olice COLLAR MOUNTED DUAL ACTUATED FUEL FEED DEVICE David E. Anderson, Cleveland Heights,

Van Hartesveldt, Shaker Thompson Products, Inc., tion of Ohio Application May 31, 1951, Serial No. 229,064 2 Claims. (Cl. 261-18) and Carroll H. Heights, Ohio, assignors to Cleveland, Ohio, a corpora- This invention relates to a supplementary fuel feed attachment for a carburetor, and more particularly deals 'th a mounting collar receivable on the air horn of a carburetor for carrying a supplemental fuel unit and an air filter together with tubes adapted to extend into the carburetor venturi Without interfering with the operation of the carburetor.

the engine.

quickly installing a supplemental feed unit on the air horn of a carburetor without drilling holes in the carburetor for feeding the supplemental fuel thereto. l

Another object of the invention is to provide a dual controlled supplemental feed unit wherein one control is obtained from the carburetor venturi through a tube carried by a device for mounting the unit on the air horn of the carburetor.

Other and further objects of the invention will be apparent to those skilled in the art from the following detailed description of the annexed sheet of drawings which, by way of a preferred example only, illustrates one embodiment of the invention.

On the drawings:

Figure 1 is a vertical cross-sectional view, with parts in elevation, of a collar mounted dual actuated fuel feed device, according to this invention, on the air horn of a carburetor.

Figure 2 is a horizontal cross-sectional view, with parts in plan, taken along the line II-II of Figure 1.

As shown on the drawings:

As shown in Figure 1, the mounting collar of this invention carries a supplemental fuel feed unit 11 on the Patented Jan. 11, 1955 side thereof, is mounted on top of a carburetor 12, and carries an air iilter 13 on the top thereof.

The collar 10 has a vertically split cylindrical body 14 opposed external ears 15 on opposite sides of the vertical slot 16 thereof and with a transverse rectangular llange 17 projecting from the other side thereof. body has a counterbore 18 in its bottom end terminating in a ilat internal shoulder 19. The top of the body has a cylindrical external Wall 20 terminating in an outturned shoulder 21.

A clamping screw 22 has a headed end fitting freely through one ear 15 and a threaded shank screwed into the other ear 15 for contracting the split cylinder. The llange 17 has a pair of lateral bores 23 and 24 therethrough and extending from the ilat outer face 25 of the flange to the interior of the body 14 above the shoulder 19 thereof. The bore 24 carries a carries a vacuum tube 27. at the end face 25 of the The post 31 car-ries a metering orifice 40 in the bottom end thereof for feeding upstanding tube 41 in the post. A passage 42 in the body and communicates with the recess 32 in the body.

As best shown in Figure 2, mounting flange 50 on the side thereof receiving the passages 48 and 49 therethrough. Th

51 adapted to mate with the face 25 of relation. tween these faces 25 and 51.

The passageway 48 registers with the end of the tube 26 at the face 25 of the flange 17 as shown in Figure l. The passage 49 registers with the tube 27. An orifice plug 53 is provided in the passage 49 for a purpose to be hereinafter described.

The upper end of the body 30 has a passage 54 therethrough communicating with the recess 32 and receiving a tube fitting 55 which connects the tube 56 therewith. A metering orifice plug 57 is provided in the passage 54 for a purpose to be hereinafter described.

The carburetor 12 to an outlet passage outturned flange 65 float bowl chamber carburetor body and has an outlet 67 in the bottom end thereof communicating with an upwardly sloping passage 68 receiving a fuel metering tube 69 projecting into the venturi throat 62. An air vent 70 extends from the upstream side of the venturi throat into the passage 68 for supplying air through the orifices in the tube 67 for admixing air with the main fuel flowing through the tube from the pond P in the float chamber 66.

A butterfly choke valve 71 is mounted in the air inlet passage 61 on a transverse rotatable rod 72 carried by the air horn 60. This valve 71 is adapted to swing from the fully opened position shown in solid lines to the closed dotted line position. A notch 73 is provided in the periphery of the valve 71 to receive the tubes 26 and 27, as best shown in Figure 2.

As shown in Figure 1, the tubes 26 and 27 depend from the body 14 of the mounting 10 through the passage 61 of the air horn 60 and are disposed close to the side wall of the air horn in the region of operation of the valve 71 so as to not interfere with free opening and closing movements of the valve. The lower ends of the tubes project into the venturi throat 62 and terminate at the throat in full open communication therewith in a downstream direction.

As shown in Figure l, the counterbore 18 of the mounting body 14 receives the air horn 60 snugly therein and the top of the air horn is bottomed on the shoulder 19 to automatically position the terminal ends of the tubes 26 and 27 in the venturi throat 62, while holding the tubes along the side wall of the air horn in the vicinity of the choke valve 71 so that the valve can operate freely and receive the tubes in the notch 73 thereof. Since the tubes are of relatively small diameter, the notch need only be of very small size so as not to interfere with proper control of the air flow through the air horn.

A throttle valve 74 is mounted on a rotatable rod 75 extending transversely across the outlet passage 63 and carried by the outlet boss 64. The throttle valve controls flow of the air and fuel mixture created in the venturi throat 62 from air flowing past the choke valve '71, from main fuel flowing through the tube 67, and from supplemental fuel flowing through the tube 26.

The air fed to the valve 71 is filtered by the filter 13 which has a split mounting collar S on the bottom end thereof snugly surrounding the cylindrical wall 2() of the mounting body 14 and adapted to be bottomed on the shoulder 21 of the body. The collar 80 has outturned ears such as 81 on opposite sides of the vertical slot 82 therein and a draw bolt 83 is adapted to pull the ears toward each other for contracting the collar into clamped engagement on the wall of the mounting collar.

The bottom flange 65 of the carburetor is mounted on the mounting pad 84 of an intake manifiold 85 for the engine (not shown). Bolts such as 86 secure the carburetor on the manifold. A plug 87 anchored in the manifold 85 joins the tube 56 from the feed device 11 to the interior of the manifold.

Operation Anti-detonant fuel from the pond P in the float bowl of the feed decive 11 is sucked through the tube 26 under the influence of carburetor venturi vacuum for admixture with the main fuel from the pond P and air from the air filter 13 to supply a non-detonating combustible mixture to the throttle valve 74 and thence to the intake manifold 85. In order for the anti-detonant fuel to enter the tube 26, however, the valve 44 must be open and the valve can only open when vacuum acting on the diaphragm 36 is insufficient to overcome the opening force of the spring 46. The vacuum actuating the diaphragm 36 is obtained from two sources and the valve is thereby dual controlled. Carburetor venturi vacuum obtained through the tube 27 as metered by the orifice plug 53 renders the valve sensitive to the speed of the engine as determined by the rate of air flow through the carburetor venturi. A rapid air flow will create more of a suction pull through the tube 27 than a slow air flow. The tube 56, however, also pulls a vacuum on the valve 36. This vacuum is created by the intake manifold pressure as metered by the orifice 57. Therefore, the diaphragm 36 is pulled downwardly against the load of the spring 46 to close the valve 44 under the influence of a differential vacuum obtained from the carburetor venturi and the intake manifold. Since the intake manifold pressure is responsive to loads on the engine, and, as explained above, since the venturi vacuum is responsive to engine speeds, the differential vacuum control of the valve 45 is sensitive to both engine loads and engine speed conditions. This control is highly desirable.

The dual control is readily obtained through the use of the collar 10 which when mounted on a carburetor automatically positions tubes from the feed device 11 in the venturi throat of the carburetor so that one tube will supply the anti-detonant under the influence of the pull exerted in the throat while the other tube will apply this pull te create a closing force on the metering valve for the fluid.

in installations for dual carburetors having two venturi throats, the collar 10 carries a third tube for feeding the anti-detonant from a passage 48 of the device 11 to the second throat. The two other tubes terminate in the rst venturi throat as shown in Figure 1, so that both feed tubes are controlled from one vacuum tube 27.

From the above descriptions it Will be understood that this invention provides a convenient carburetor mounting for a dual vacuum controlled supplemental fuel feed device which does not interfere with carburetor operation and does not require modification of carburetor structures.

It will be understood that modifications and variations may be effected without departing from the scope of the novel concepts of the present invention.

We claim as our invention:

l. A dual actuated anti-detonant fuel feed device for mounting on the air horn of a conventional carburetor or the like at the junction thereof with an air cleaner, said carburetor having a venturi throat, a notched choke valve plate in an air passage upstream from the venturi throat, and a throttle valve plate in a fuel and air passage downstream frorn the venturi throat communicating with an intake manifold, and for operative combination with the carburetor substantially without modification of the construction of the carburetor and Without modification of the operational characteristics of the carburetor, comprising, a collar, a split in said collar, a counterbore in said split collar to mate with the air horn of the carburetor, contracting means to securely clamp said collar on the air horn, a flange projecting from said collar at an area thereof oppositely disposed from said split, a feed unit body secured to said flange, an anti-detonant pondcarrying bowl secured to said body, a recess in said body, a bore in said body extending from said bowl to said recess, a pair of passages extending through said body and through said flange and communicating with an interior surface of said collar beyond said air horn, one of said passages communicating with said bore and the other of said passages communicating with said recess, open ended tubes extending from said passages at said collar and along an interior surface of said air horn at said venturi throat, the tube extending from the passage communicating with said recess being formed to terminate in the region of the center of the venturi throat, a third passage extending through said body to said recess to communicate with the intake manifold, and a differential vacuum operated valve in said recess to open and close the passage communicating with said bore in accordance with venturi throat vacuum and intake manifold vacuum thereby providing a speed responsive and load responsive anti-detonant feed mechanism.

2. In an anti-detonant fuel feed device for combination with a carburetor having an air horn, a butterfly type choke valve in said air horn, a venturi throat downstream from said air horn, a fuel inlet tube opening into said venturi throat, a throttle valve downstream from said venturi throat, an intake manifold downstream from said throttle valve, and an air cleaner having a split collar normally secured to said air horn upstream from said choke valve by said split collar, said choke valve including a disc mounted for rotation; a split collar member to clamp onto said air horn, said collar member having a counter bore to bottom on said air horn, a portion of said collar member having substantially the same external dimensions as said air horn to mate with the split collar of said air cleaner without modification thereof, a flange on said collar member, an anti-detonant feed unit having a flange thereon to register with the flange on said collar and secured thereto, a differential pressure responsive diaphragm valve in said feed unit, an antidetonant container in said unit in flow communication with said valve, means to vent one side of the diaphragme of said valve to the atmosphere, means to vent the other side of the diaphragm of said valve to the intake manifold differential pressure actuation from the venturi throat and from the intake manifold.

References Cited in the file of this patent UNITED STATES PATENTS