US2191727A - Fuel supply mechanism for gasoline stoves - Google Patents

Description

Feb. 27, 1940. E. HCKUP 2 2,191,727

FUEL SUPPLY MECHANISM FOR GASOLINE STOVES Filed Nov. 27, 1936 2 Sheets-Sheet 1 J5 eorc eZTPL'c (a .7

, (ATTO gg/s Feb. 27, 1940.

FUEL SUBPLY MECHANISM FQR GASOLINE STOVES Filed Nov. 27, 1936 2 Sheets-Sheet 2 m Georc eE. Pic/cu .7 62 [Xi/1L Cf m y 's. E. PICKUP 2,191,727

, Patented Feb. 27, 1940 r I UNITED STATES PATENT OFFICE I 1.

r 2,191,727 7 I I FUEL SUPPLY MECHANISM, FOR GASOLINE I STOVES George E.Pickiip, Newark, Ohio, assignor to Newark Stove Company, a corporation of Application November 27, 1926, Serial No. 113,028

' 2 Claims. (01. 158-81) This invention relates to valve controlled means for supplying fuel from the usual pressure tion of the stove. This involves several distinct .v'alveoperations by the user at spaced intervals of time and therefore requires close atterrtion, to-

gether with a proper understanding of the order and time of operation of the individual valves.

With the foregoing in view, one object of the invention is to provide for the supply of fuel to the burner mechanism by means requiring only an initial valve setting operation by the user.

Another 'object is to provide a fuel supply mechanism automatically operable after a 'pre-, 25 determined time interval to change the initial vaporized fuel supply taken from the supply' tank for starting purposes, to liquid form for the continued or running operation. A further object i's'to provide an improved fuel the starting fuel supply is controlled by pressure responsive'valve means' Another object is to provide mechanism of novel and advantageous character utilizing a combination of automatic pressure operated and-thermostatic valves to control the starting and running conditions of the burner mechanism. I

A general object is to providea fuel supply 0 mechanism capable of performing the aforesaidfunctions eifectu'ally, and which is simple in construction and reliable inoperation.

The objects of the invention thus generally stated, together with other and ancillary objects and advantages are attained by the construction and arrangement shown by Way of illustration in the accompanying drawings in which: n

Figure l is a more or less diagrammatic plan '.-0 View, partially in section, of a burnermechanism and associated fuel supply means embodying the invention. Y i v,

v Fig, 2 is a fragmentary sectional v elevation taken approximately in the plane of line 272 of Fig.- l.

.shown herein, such mechanism may include a an elongated tube arranged to be heated in part supply mechanism of this character, inwliich a fuel supply Fig. 3 is a fragmental sectional view taken approximately'in the plane of line 33 of Fig. 2.

Fig.4 is a fragmentary sectional view taken. 7 approximately, in the plane of line 4- 1 of Fig. 2.

Fig. 5 is a fragmental elevational View, partially in section of the starting tube assembly.

While the invention, is susceptible of various modifications and alternative constructions, I have shown in the drawings and will herein describe in detail thepreferred embodiment, but it is to be understood that Ido not thereby intend to limit the invention tothespecific form disclosed, but intend to cover all modifications and alternative constructions falling within the spirit and scope of the invention as expressed in-the appended claims. I

My invention is particularly adapted for use in a gasoline cooking stove or range having burner mechanism of any suitable character. As

. plurality of cooking burners, two belng shown and designated, respectively, It and H. These burners communicate with the manifold l2, .and I are under the controlof suitable valve devices l3 and 14-, respectively, arrangedfor convenient .25 manual operation in the usual way. In normal operation vaporized fuel is supplied to the manifold by a generator [5 which is in the formof by the burner to. For this purpose the latter burner is herein formed in two sections disposed Underlying onopposite sides-of the generator. the generator is an elongated auxiliary burner I6 that is in" constant communication with the manifold l2. The discharge of' vaporized fuel from the generator is under the controlof the usual needle valve ll having a stem l8 extending axially of the tube and projecting from the forward or inlet end thereof for operation'by'me'ans of a suitable handle I9; The fuel issuing from 0 the generator passes into a tubular goose-neck mixing chamber 20 which communicates with form, is adapted to contain a supply "of liquid.

fuelunder air pressure. The front wall of the tankis formed as a head -24- having a fuel inlet 25, a pressuregauge 2'! and a threadedly secured so fitting-28. Within the fitting is an angularduct 29 one end of which communicates with the in- 'terior of the tank while the other end opens through an inlet nipple 30 to which is connected onefend of an'air conduit 32, (Figs. 1,2 and 3-) The other end of this conduit is connected to a suitable hand pump 33 by which the necessary air pressure may be developed within the fuel tank.

Under the force of the air pressure, fuel is supplied from the tank 24 both for starting and for running purposes. To this end the fitting 28 is equipped with tubular means depending therefrom into the tank for communication with the top and bottom portions thereof, and valve means operative to effect the supply, first of a rich mixture of air and fuel vapor liquid fuel.

As shown in Figs. 2 and 5 the tubular means referred to comprises in part two parallel'start ing fuel tubes 3? and arranged to extend inwardly and downwardly within the tank for withdrawing therefrom the rich mixture of air and vapor for starting purposes. Thetube 34 is connected at its upper end with the inner or lower end of the fitting 28 and constitutes a main supply tube. The tube 35 is in the nature of an auxiliary or vapor tube having its upper end near the top of the tank above the mazn'mum fuel level therein which is indicated at 3?. At their lower ends the tubes are connected through the medium of a chambered cylindrical member or head 33 which serves as acombined metered intake and atomizing chamber. Air pressure within the tank forces the carbureted fuel air mixture upwardly from the main tube 34 into a passage 39 formed in the fitting 28. For a more detailed description of a pre-generating or carbureting mechanism of this character attention ile is invited to my copending application Serial No. 614,901 filed June 2, 1932, now Patent No. 2,067,412, issued January 12, 1937.

According to the present invention, the initial supply of air and vapor from the upper portion of the supply tank, enriched by atomization of liquid fuel in the carbureting head 38, is con- .trolled for delivery automatically for a predetermined interval of operation designed to prepare theburner mechanism to receive and utilize efiicientlyliquid fuel. This enables an arrangement of the fuel. supply mechanism such that only an initial valve adjustment by the user is required when. lighting a stove which will thereafter automatically attain full operating .-.the supply tank 23 for. controlling the flow of starting fuel to the burner mechanism. Such valve means, indicated generally by the numeral 40 (Fig. 2), may conveniently be mounted on the fitting 28 which may have for this purpose a rigid support or base flange M (Fig. 3). One side of this flange has a flattened hollow face 42 through which opens a branch passage 43 that communicates with the fuel passage 39. Marginally encircling the hollow face 42 is .an axially projecting rim or shoulder 44 which. is opposed by an internal, axially facing shoulder .45 of a'hollow cap 47. The latter is threaded onto the base flange and forms therewith a charmber 48. Held tightly between the shoulders 44 and 45 and transversely separating the chamber 48 is a diaphragm 49. erably a thin, slightly dished metallic disk which is biased for axial movement normally away from the face 42 of the base flange into 'a position as shown. in broken line in Fig. 3.

Suitably secured axially to the diaphragm 49 andthereafter plunger 54 which protrudes from the stem 50 and is maintained in extended position by a.

The spring servesto relieve the valve element 54 from excessive valve seat 53.

This diaphragm is pref-' is a generally round hollow stem 50 which projects into a passageway 5| that communicates with the pressure chamber axially through vthe face 42 of the base flange 4i, and is connected at its outer end with the burner mechanism of the stove. The passageway 5| may be formed in a tubular bushing 52 suitably threaded into the base flange and has a portion 5 l of restricted diameter to'provide a shoulder 53 serving asa seat for a resilient composition valveelement 54 carried at the end of the stem 56. This valve element is mounted upon an axially movable coiled compression spring 55.

pressure and thus avoids sticking against the As shown, the form and length of the valve stem 50 are such that when the diaphragm 49 is in its. biased position,. the valve element 54 is .unseated, thereby permittingfuel vapor to escape from the pressure chamber 48 past the valve stem and ,out through the restricted portion of the passageway 51. To close the valve, force is applied-axially along the stem 50 in opposition to the bias of the diaphragm, herein through the ,The tension of the springit is adjusted toact against-the diaphragm with a force that is substantially balanced by the normal bias of the diaphragm 49 supplemented by the working pres-' sure within the fuel tank 23 which is transmitted to the .valve side of the diaphragm by the passages 39, 43 in the fitting. As a result, any increase in fuel pressure will act to overbalance the spring, and the diaphragm will snap into the open valve position to permit delivery of a starting fuel sup-ply. In practice, a pressure differem tial of about 3 to 5 pounds in the tank above the usual working pressure of approximately 30 pounds has been found ample to cause the valve to re main open throughout the starting operation. The time interval of such operation will,

of course, be predetermined by the rate at which withdrawal of starting fuel exhausts the surplus pressure.

Liquid fuel for running purposes is withdrawn from the lower portion of the fuel tank 23 through atube 6! (Fig. 4) which extends from the fitting 28 and has a strainer head 62 located near the atomizing head 38 At its upper end the, tube 62 registers with one leg of an angular" liquid fuel passage 63 within the fitting. Amanually operable flow controlling valve 64 seated within the duct 63 has a threaded stem which carries a handle 57 at its outer end. In'the form trolled to follow the starting operationafter; a-

predetermined interval during which the generator is heated sufficiently to vaporize the liquid fuel. This interval is preferably coordinated substantially with 'the intei vial during which there is a starting pressure differential in the fuel tank. To this end, the conduits may be connected with a thermostatic valve device 10. Such device may comprise a casing H fixedly mounted laterally spaced from the generator tube upon one end of a transversely extending bracket 12. Interiorly, the casing is formed with a pair of intersecting flow passages 13 and 14 which connect with the conduits 58 and 69, re-

spectively. 1

The passage '13 provides uninterrupted communication between the starting fuel delivery conduit 68 and a common delivery pipe 15 which is connected to the inlet end of the generator tube. Communication between the liquid fuel passage 14 and the delivery pipe 15 is interrupted, however, by a valve 11 which is carried upon one end of a thermo-respo-nsive rod 18 arranged to be heated in the operation of the burner mechanism. Preferably, the rod extends from the valve casing between the generator tube l5 and the generator burner i1 and is fixedly connected at its outer end to the opposite end of the bracket 72. Thus, only starting fuel will be delivered to the generator until the thermostatic rod has been heated sufficiently to open the valve Thereafter, if starting fuel continues to be Tl. delivered it supplements the liquid fuel during the initial part of the running operation and then will cease when the pressure in the fuel tank drops to close the starting valve 54. Upon the discontinuance of the application of heat to the generator tube 55, the supply of fuel will quickly be interrupted by contraction of the rod 18 which will cause the valve IT to close.

It will be apparent that, by the construction and arrangement set forth the operation of gasoline stoves may be greatly simplified. To start the burner mechanism the user need only pump the tank pressure slightly above that necessary for running purposes, turn the liquid fuel valve handle 61 to the on position, open the generator needle valve H, and light the generator burner l5. Thereafter the stove will automatically arrive at the running condition. Thus the user is relieved of the necessity of attending the stove to effecta change in the fuel supply means from the starting to the running conditions thereof. As a result, the general utility of-stoves of this character is substantially increased.

I claim as my invention: 1. In combination in a fuel delivery system for a stove including a generator and a burner,

a fuel tank, starting and running fuel conduits leading from said tank to said generator, valve means mounted on said tank for controlling heated and having a liquid fuel passage therein communicating with the running fuel conduit, a valve member within said casing for controlling said passage, a delivery duct communicating at its inlet end with said passage and at its outlet end with said generator, a rod of thermo-responsive material lying between said generator and burner fixed at one end and carrying the valve member at the other end to move the same axially to open or close said liquid'fuei passage upon expansion or contraction respectively of the rod, and a starting fuel passage within said casing by-passing said valve and communicating at one end with said starting fuel conduit and at the other end with the inlet end of said delivery duct.

2. Fuel supply mechanism for gasoline stoves comprising, in combination, a fitting to be mounted upon the fuel tank of the stove and having separate tubes extending fixedly therefrom adapted for withdrawing liquid fuel and vaporous fuel respectively from the tank, said fitting having a body including a passage lead ing from the liquid fuel tube to convey the liquid fuel to a fuel conduit, a manually operable valve mounted in said body to control said liquid-fuel passage, a surface on said body having one pas-' sage opening therethrough in communication GEORGE E. PICKUP.

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