US1718735A - eiker - Google Patents

Description

June 25, 1929.

T. B. EIKER CARBURETOR Filed Oct. 31, 1924 2 Sheets-Sheet 2 INVENTOR ATTORNEY Patented June 25, 15929.

Tl-IADDEUS B. EIKER, OF NEW YORK, N. Y.

CARBURE'IOR.

'7 Application filed October 31, 1924. Serial No. 746,956.

The invention relates to improvements in carburetors for hydrocarbon engines, and it consists in the novel features, arrangements and combinations of parts hereinafter described, and particularly pointed out in the claims. i

One object of the invention is the attainment of high efficiency in the engine and great economy in the consumption of the gasolene.

A further object of the invention is to provide a carburetor in which the proper admixtures of air and gasolene for the various duties required of the engine, may be secured.

A further purpose of the invention is to providea carburetor of particularly durable and strong and comparatively inexpensive construction and composed of a. minimum number of easily assembled parts.

The invention will be fully understood from the detailed. description hereinafter presented, reference being had to the accompanying drawings, in which:

Fig. 1 .is a top plan view of a carburetor.

embodying my invention,

Fig. 2 is a vertical longitudinal section through the same taken on the dotted line 22 of Fig. 1;

Fig. 3 is a detached face view, on a larger scale, of the butterfly throttle valve employed in the carburetor;

Fig. i is a-top edge view of the same;

Fig. 5 is a vertical transverse section through a portion of the carburetor taken'on the dotted line 55 of Fig. 6; ,c

Fig. 6 is a horizontal section through the carburetor taken on the dotted line 6-6 of Fig.2;

Fig. through the same taken onth e dotted line 7-7 of Fig. 1;

F 1g. 8 1s a vertical transverse section, on

a larger scale, through the same taken on the dotted line 88 of Fig. 2 and also on the dotted line 88 of Fig. 9;

Fig. 9 is a horizontal section, partly broken away, through .the same taken 011 the dotted line 99 of Fig. 8, and i Fig. 10 is a perspective view, on'a larger scale, of the gasolene supply valve shown on a small scale in Fig. 7.

In the drawings 10 designates a cylindrical casing affordin a chamber 11 for gasohas or other 11L aid .ue1,12 aaai row auxil from 7 is a vertical longitudinal section gral with the casing 10 and affording an auxiliary chamber 13 for the liquid fuel, 14: a tubular coupling member or intake nozzle also projecting from and being integral with said casing 10 and affording an inlet for gasolene or fuel thereto and 15 a Venturi tube affording at one end an air intake 16 and at its other end an intake pipe or sec tion 17 for fuel to the engine manifold, not

' flange or skirt portion 20 to be screwed within the upper interiorly threaded edge of the casing 10, a laterally extending edge portion to seat against the upper edge of the casing 10, as shown in Fig. 7, and an upper central hexagonal pro ect1on 21 to receive a wrench and provided with a vertical orifice 22 to serve as a support and guide for a stem 23 associated with the mechanism of the float 24 locatedin the gasolene chamber 11.

The auxiliary casing 12 is of considerable vertical height and extends laterally at an angle from the main casing 10, as shown in Figs. 1, 2 and 6, and said casing 12 is entirely open at its vertical inner end and in communication with the chamber 11 of the casing 10. The auxiliary casing 12 is closed at its bottom, sides and top, except at a vertical opening 25 in said top (Figs. 2 and 8) within which is located the vertical tubular nozzle 26, said nozzle beirfg open at its lower end and in its sides being formed with inlet apertures 27 through which, as

well as at said open lower end, the gasolene from the chamber 13 may enter said nozzle and, be drawn upward through and from the same by the suction action of the engine. The nozzle 26 is open at its upper end, andsaid nozzle is formed with a thickened portion 28 whose lower edge constitutes a shoulder resting upon a shoulder 29 formed within the opening 25, as more clearly shown in Fig. 8.

The thickened portion 28 of the 11ozzle 26 is adjacent to the up'er end thereof, and at the upj r and t sai nozzle the metal therethickened arties ea duced thickness, leaving an annular exterior open-top recess (Fig. 8).

The auxiliary casing 12 is narrow, and the nozzle 26 is positioned within the outer end thereof, and the bottom of said auxiliary casing 12 is preferably slightly above the bottom of the main casing 10 so that any sediment that may gather on the bottom of the casing 10, may not too readily pass into the chamber of the casing 12-. The lower end of the nozzle 26' is above the bottom of the casing 12, as shown, and while the lower end of said nozzle is not likely to become obstructed by foreign matter in the gasolene, it may become so obstructed and in that event the inlet for gasolene to the nozzle 26 will be through the apertures 27 ,said apertures being provided for that purpose. The Venturi tube 15 extendsalong one sid of the casing 10 and near the upper end of said casing, and said. tube crosses over the upper end of the auxiliary casing 12, and said tube 15 in the location I give to it with relation to the other portions of theca-rburetor, is of considerable importance, and in addition the construction and relation of the casing 10,

auxiliary casing 12 and tube 15,- are such as to render the carburetor extremely durable, aswell as eflicient in operation.- V

The tubular'coupling or intake member 14 which is also integral with the casing 10, is

parallel with the intake end 16 of the tube 15 and spaced laterally therefrom, sufficient space being left between the member 14 and the adjacent portion of the tube 15 to admit a customary form of lever 31, which issecu red upon a transverse rod 32 extending'into the tube 15-and having thereon a customary choke valve 33. The disposition of the lever 3-1- at the inner side ofthey tube 15 and within the space between said tube and the coupling member 14 serves to present a compact arrangement ofthe mechanism, tending to the longevity of the device,

The coupling or intake member 14 is formed with an externally threaded reduced nozzle section 34,, which provides, asmooth bore to receive the inner end of a nozzle 35, said nozzle being formed in one part with a pipe section 36'havingan annular shoulder 37 to-seat against the outer end of the section 34.- Between the nozzle 35- and pipe section 36 is a transverse partition 38 having? a conicalseat or aperture 39 for a needle valve 40, said needle valve being adapted to have alongitudinal movement toward and from the seat 39 and being under the control of the float 24. Thenozzle 35 and pipe section 36 are secured in position with relation to the nozzle section 34 of the coupling 14 by means of a cap-nut 41, which is screwed upon the section 34 and up against the annular shoulder 37, as shown in Figs. 6 and 7. The section 34 has'atits outer edge asmall pin 42, shown into the section 34, a recess 43 in the shoulder 37 passes upon and interlocks with said pin 42 and prevents rotation of the nozzle 35 and pipe section 36, and thereby the needle valve 40 and its connections are kept in proper operative alignment. The pipe section 36 will have connected with it a conduit, not shown, from the usual gasolene supply tank, from which the chamber 11 of the casing 10 receives its supply of fuel under the control of the float24 and needle valve 40. The inner end of the nozzle 35 is slotted longitudinally, as shown in Figs. 6 and 7, and within the slot thus formed is positioned the outer forked end of an operating rod 44,-which rod lies partly within the chamber 11 and partly within the chamber of the coupling member 14, and at its inner end is pivotally connected to the lower end of an adjusting rod 45 which extends through a sleeve 46 located centrally within the float 24. The outer forked end 47 of the rod 44 is pivoted at 48 to the nozzle 35, and the nozzle 35 is equipped with a transverse pin 49 to arrest a finger 50 on the forked end 47 of the. rod 44 when said rod has-turned downwardly at its inner end to a proper ex tent to retract the valve 40 from the walls of the opening 39 and admit gasolene to the easing 10. The forked end 47 of the rod 44 passes within the slot in the inner end of the valve 40 and freely receives a pin 51 connected with said valve 40, as shown in Fig. 7. lVhen the float 24 descends, owing to the consumption of gasolene from the chamber 11, the inner endof the rod 44 moves downwardly and the finger 50 on said rod turns against the pin 51 and moves the valve 40 from its seat, and when the float 24 ascends in the chamber 11 the other member of the fork 47 moves against the pin 51 and forces the valve 40 against its seat, thereby cutting off the inlet of the gasolene to the chamber 11. I

call attention to the durable construction and relation of the coupling member 14, nozzle 35, pipe section 36 and. nut 41.

The internallyytln-eaded sleeve 46'extending through the float 24 is screwed upon the threaded stem 45, and when the floatis prop erly adjusted on the stem 45 said float may be secured against rotation by means of a cross pin 52 extending transversely t'l'i'rough a hole in an upper portion of the: stem 45 and lying within the vertically slotted upper end of the sleeve 46, the upper end of said sleeve being extended above the float 24 and transversely slotted to'serve as a key for the pin 52. The upper end of the stem 45 is of reduced diameter and smooth, and said end constitutes the aforesaid stem 23 which extends through the guide opening 22 in the cap 19 of the casing 10. The float 24 operates in a familiar inanner to admit gasolene to'the casing lO and cut off the supply of gasolene therefrom when the requisite quantity of gasoleneis within the chamber of said casing. The needle valve 40 is, however, of special construction and square outline in cross-section, the corners of the square being flattened to form equidistant ribs 70 which slide on the inner surface of the nozzle which is circular in cross-section. Between the ribs 70 the body of the valve is longitudinally grooved, as at 71', to afford passages for the gasolene to the floatchamber 11. The valve 10 has a conical head 72 to engage the walls of the conical opening 39, and back of the head 72 the valve has an annular recess 73 extending around aneck 74. which connects the head 72 with the main body of the valve. The recess 73 has been found to be of special benefit in assuring a desirable and prompt inflow of the gasolene to the float-chamber, said recess resulting in the supply of gasolene being properly maintained at times when the engine is laboring and the impulses are slower, aswhen climbing. I

\Vithin the tube 15 and above the nozzle 26 is positioned a butterfly throttle valve 53, shown in detail in Figs. 3, 4 and 9. The batterfly valve 53 is circular in outline and may be turned across the intake pipe section 17 of the tube 15, as shown in Figs. 2 and 8, or may be turned at an angle to the axis of the tube 15 or longitudinally of said tube, in accordance with the results desired. The butterfly valve 53 is distinctive in two respects, one being that the valve is of such diameter that when turned across the section 17 of the tube 15 an annular space 54t is left between the edges of the valve and the inner surfaces of the section 17 through which air may. pass. The second distinctive feature of the butterfly valve 53 is that one vertical half, that being the half which turns toward the intake end 16 of the tube 15 when said valve is wide open, is materially thicker than the other vertical half of the valve, as shown in Fig. 4-, and has a beveled edge 55. The thicker half of the valve 53 is numbered 56, and the other vertical half thereof is numbered 57. The space 5% which. is left around the valve 53 when said valve is closed and the construction of the vertical half 56 of said valve, as dis tinguished from the vertical half 57 thereof, are features of novelty and result in the attainment of certain functional results which will be hereinafter explained.

The butterfly 01' throttle valve 53 has a central vertical substantially semi-circular recess 58 fitting freely against the upper thicker portion 28 of the nozzle 26 and also has upper angular oppositely disposed straps 59, 60 which closely engage and key the valve 53 to the lower polygonal portion of a vertical tubular holder 61 which projects downwardly into the intake section 17 of the tube 15 and is in vertical alignment with the nozzle 26 and at its lower end. is adjacent to but spaced from the upper end of said nozzle, as shown in Fig. 8. The holder 61 has an externally threaded section 62 on which an internally threaded adjusting sleeve 63 is arranged, and

both said section 62 and sleeve 63 are posi tioned within a smooth surfaced socket 64: which is integral with the tube 15. The sleeve 63 engages the bottom of the socket 64 and may be rigidly secured in position by .means of a set screw (Fig. 2). By turnscrew 76 (Fig. 2), a lever arm 65 of known character to be connected by usual linkage, not shown,'to the throttle lever.

Within the holder 61 is a vertical needle valve 66 whose upper shank portion is threaded and engages a threaded portion of the bore of said holder, this construction making it convenient to adjust the needle valve vertically with relation to the nozzle 26. On the upper end of the needle valve 66 is a serrated head 67 by which said valve may be conveniently turned for vertically adj usting the same with relation to the nozzle 26 and which head in usual practice is en gaged by a spring detent 68 (Fig. 1) mounted in a socket in an upstanding lug 69 formed on the arm 65. On the oscillating movements imparted to the arm 65, said arm imparts rotary motion to the holder 62 and needle valve 66 and through said holder actuates the butterfly or throttle valve 53. The needle valve 66 has a tapered or conical point which enters the upper end of the bore of the noz zle 26, and back of this conical point said valve is formed with an annular V'shaped or conical groove 80, which is mainly within the bore of the holder 61 but is open at the lower end of the holder 61. I have found the annular groove to be important in that in practical operation the gasolene from the nozzle 26 rides upwardly over the conical tip of the valve 66 and into the groove 80, with the result that there is an effective distribution of the gasolene in the air-passage and an eflicient mixing together of the gasolene and am.

The operation of the carburetor will be understood generally from the. description hereinbefore presented. The air moves through the tube 15 in a well understood manner and the gasolene issues from the upper end of the nozzle 26, and the mixture of the air and gasolene is then moved through the chamber of the intake. section 17 and passes to the engine manifold, as usual. The choke valve 33 is operated in the customary Way and requires no explanation. An improved admixing of the gasolene and air is secured by the presence of the annular groove 80 above the conical tip of the needle valve 66. The butterfly throttle valve is so shaped and proportioned that when in its closed position it leaves a space 54 around it; this space admits sufficient air to provide, with the gasol'ene emer ing from the nozzle 26, a proper mixture i'or idling, it only being required to turn the valve 53 to its closed position for throttling down without regard to adjustments. The thicker half 56 of the valve 53 in the full open position of. said valve has been found to be very advantageous in seeming a fuel mixture of proper richness for power or for accelerating the action of the engine. The supply valve 40 is novel and is controlled in its movements from the float 24 and the details of the valve 40 have been explained hereinbei'ore. The float Qt is adjustable on and very firmly supported by the rod 45 which is threaded throughout all of its length which engages the sleeve 46, such engageme'i'it extending the full depth of the float and hence being firm and uniform, The supply nozzle 26 in respect to the openings 27 is new, and a further feature of the nozzle is the presence around its upper end of the annular open-top recess 30, which .with the adjacent wall of the recess 58 in the valve 58 creates a chamber which is closed half-way around the nozzle 1n all the posltions of the valve 53, said chamber aldlng in securing a highly efiicient admixture of the air and gasolene in every position of the valve 53.

The durable nature of the carburetor will be understood when it is observed that the tube 15, float-casing 10, auxiliary casing 12,

within said tube downwardly into said fuel chan'rber, a needle valve above and in axial alignment with said nozzle andto cooperate therewith, a rotary vertically n'r'ovable tubular holder for said needle valve and a butterfly throttle valve mounted on the lower end of said holder within said tube, said needle valve having a conical operating end and above the same an annular recess which is partly within said holder. and opens below the lower end of the same.

2. A carburetor as claimed in claim 1', in which the annular recess in the needle valve is conical, having inwardly converging upper and lower wall surfaces.

3; In a carburetor, the coi'nbina'tion with an air-intake tube and afuel chamber therebelow,-of a: tubular fuel nozzle extending from within said tube downwardly into said fuel chamber, a needle valve above said nozzle and to cooperate therewith, a rotary vertically movable tubular holder for said needle valve and a butterfly throttle valve mounted on the lower end of said holder within said tube, thelower end of said holder being polygonal in cross-section, the upper end portion of said fuel nozzle being circular in cross-section and of reduced diameter, leaving an annular recess around said portion, and said butterfly valve having at its upper end oppositely disposed straps to engage the polygonal end of said holder and below said straps a vertical recess extending around about one-half of the upper end of said nozzle and the recess therein and bridging the space between the adjacent ends of said holder and said nozzle, said needle valve having a conical operating end and above the same an annular recess which is partly within said holder and opens below the lower end of the same.

Signed at New York city,-in' the county of New York, and State of New York, this 29th day of October, A. D'. 1924:.

THADDEUS B. EIKEB.

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