US2173522A - Hydrocarbon stove - Google Patents

Description

Sept. 19, 1939. c. w. MUMMERY HYDROCARBON STOVE Filed Aug. 25, 1936 4 Sheets-Sheet 1 -INVENTOR.

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Sept. 19, 1939. c. w. MUMMERY HYDROCARBON STOVE Filed Aug. 25, 1936 Sheets-Sheet 2 nw RN INVENTOR.

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Sept. 19, 1939. c. w. MUMMERY HYDROCARBON STOVE Filed Aug. 25, 1936 4 Sheets-Sheet 3 k ww wm g Q f k 1 t N Ma wk 3 xv 3% v w 7 v Q Sept. 19, 1939. c w MUMMERY 2,173,522

HYDROCARBON STOVE Filed Aug. 25, 1936 4 Sheets-Sheet 4 INVENTOR. 61 705 M HUM 9K6) ATTORNEY.

Patented Sept. 19, 1939 UNITED STATES PATENT OFFICE HYDROGARBON STOVE Application August 25, 1936, Serial No. 97,798

4 Claims.

This invention relates to new and useful improvements in stoves consuming hydrocarbon fuel and more particularly to the type in which the fuel is forced to the burner under pressure from a remote fuel tank.

An important object of the invention is to provide an automatic valve on the stove whereby the fuel tank can be located at a distance from a stove and obviate the necessity of manipulating tank valves to operate the stove.

Another important object of the invention is to provide an arrangement of the above character which prevents flooding of the manifold and burners when the latter are accidentally extinguished.

A further object of the invention is to provide an arrangement which will provide for instant lighting of the burners when cold.

More generally the invention provides for the operation of the stove and burners from in front thereof and precludes the necessity of moving from the tank to the stove to operate the same; thus making provision for the location of the fuel tank outside of the building without necessitating the operator running to and from the tank to operate the burners.

Other objects and advantages of the invention will become apparent during the course of the following description.

In the accompanying drawings forming a part of the application and wherein like numerals are employed to designate like parts throughout the several views,

Fig. 1 is a top plan of the device as applied to the four open burners of a range type stove, this view being partially diagrammatic to show the fuel lines from the storage tank,

Fig. 2 is an enlarged side elevation of the generator, burner and automatic valve assembly,

Fig. 3 is a front elevation thereof partially in section,

Fig. 4 is an enlarged detail of the distributing chamber for the generating and associated burners,

Fig. 5 is an enlarged longitudinal section of the automatic valve,

Fig. 6 is an enlarged longitudinal section of the generator tube,

Fig. '7 is a side elevation of the pressure fuel tank,

Fig. 8 is a top plan of the same.

Referring more particularly to the drawings and to Figs. 7 and 8, the numeral l0 designates a pressure fuel tank, adapted in the present embodiment, to hold liquid gasoline with a head of compressed air thereabove furnished to the tank through a valve fitting II by means of any form of pump l2. This tank is preferably located outside of a building. When the desired pressure of air within the tank is obtained, the 5. valve in Fig. 11 may be closed to trap a head of air. A liquid fuel gauge I3 of the float type may be associated with the tank and a filler tube I5 is essential for replenishing the supply of gasoline within the tank; a closure cap being provided therefor. A valve fitting l6 extends through the top of the tank l0 and has a pipe line I! leading therefrom to the automatic valve to be presently described. When the valve associated with this fitting is opened, air under pressure passes through the pipe ll as is obvious. A similar valve fitting I8 is also fitted in the top of the tank and has a pipe l9 leading therefrom to the automatic valve. Extending from this fitting I8 is a vertical liquid fuel pipe 20 terminating adjacent the bottom of the tank, in'a suitable screening or filtering means 2!. Air under pressure in the top of the tank forces the liquid fuel up through the tube 20 and thence through the pipe l9 to the automatic valve whenever the hand valve associated with the fitting I8 is opened. Since the automatic valve on the stove is provided with a hand valve for controlling the How of both air and gasoline to the generating tube, the valves in the fittings I6 and I8 on the liquid fuel tank may remain open at all times.

The fuel supply tank is diagrammatically indicated in" Fig. 1 so that the co'nnecti'onof the pipe lines'from the tank to the automatic valve 22 shown in Fig. 5, will be obvious. The air pipe I! is attached to nipple 23 of the automatic valve while the gasoline line It is coupled with a nipple 24, both of which are screwed into one end of the automatic valve casing 25. This valve casing is also provided with a lateral nipple 26 for the connection of one end of a conduit 2'! for conveying a. combustible mixture from the automatic valve to the generator tube 28 arranged above a generating burner 29. When this main burner 29 is lighted, the vaporized fuel fro-m the generator 28 passes into a carburetor 30 sucking in atmospheric air as it passes the lower port 3!, after which this mixture passes on to a mixing and distributing chamber 32 such as disclosed in my former United States Patent No. 1,827,951. The lower portion of this distributing chamber is connected with a straight manifold 33 having several branches 3! each controlled by a valve 35 having a stem extending through the manifold and a'suitably packed joint to the 55 front of the stove with which the burners are associated to terminate in. a readily accessible valve operating handle H. Each valve has a separate handle M as will be obvious. Each branch 34 leads to a riser 31 of an open range type burner B.

The center of the manifold 33 is provided with a branch pipe 38 leading to an oven burner 39 arranged inside of an oven diagrammatically illustrated by the numeral 40 in Fig. 1. A valve 4| is provided for the branch 38 and has a valve stem 42 extending through a packed joint in the manifold forwardly to terminate in a handle I-I' located adjacent'the front of the stove in convenient position for the cook to operate.

As best appreciated from Fig. 3, the manifold 33 inclines downwardly toward one side of the stove so that any liquid fuel or products of condensation will drain toward the end 2| of the manifold so as to be readily removed therefrom through pet cock 42.

Also leading from the distributing chamber 32, but forwardly thereof toward the main burner 29, is a conduit 43 which leads into a secondary distributing chamber 44 by which the combustible vapor is conveyed at all times through port 45 into the central arm or chamber 46 formed integral with the somewhat circular portion of the main burner 26. However, this central arm 46 has its passage blocked out from the passage through the circular portion of the main burner, and for the sake of clarity, will designate this central arm as the finger or generating burner 46.

The secondary distributing chamber 44 has a lateral branch partitioned off with partition 48 into a separate valve chamber 49 which may be closed off completely from the distributing chamber by a valve 50 having a .valve stem 5| extending forwardly of the stove to be as readily accessible as the other valve handles. This valve chamber is provided with a port 52 which leads into the passage through the circular burner 29 to supply the same with combustible mixture whenever the valve 50 is opened. This provides an arrangement whereby only the finger burner 46 may be lighted to the exclusion of the main cooking burner 29, or when this latter is desired, the valve 5!! may be simply opened to permit part of the combustible mixture to go through the port 52 and port 45 so that both the finger and the main burners burn simultaneously.

Referring now more in detail to Fig. 5 of the drawings illustrating the automatic valve, it will be noted that the fitting 23 terminates at'its inner end by a yieldable or resilient valve seat 55 with which the air valve body 56 having a conical operative end, cooperates. If desired the yieldable material may be placed on the valve. When this air valve 55 is seated, air under pressure from the fuel tank to the generator is cut off. This valve 56 terminates at its other end in a reduced threaded extension 5'! which extends through a central perforation in a hardened brass diaphragm 58. This diaphragm at its periphery is clamped between the automatic valve housing 25 and a removable packing nut 59. A clamping head 66 is threaded on the end 51 of the valve body sufiiciently far to clamp against the diaphragm and so that the valve stem 6! having a threaded socket at its inner end may also be screwed upon the reduced portion of the valve. A compression coiled spring 62 bears against the head 60 and one end of the plug 59 so as to normally urge the valve 56 upon its seat to out off air under pressure from the supply tank. The normal position of this valve, however, is open and off of its seat; it being held thus against the compression of spring 62 by a thermostatic control to be presently described.

The diaphragm 5B constitutes one wall of a chamber 63 which has a diagonal port 64 leading into a fuel atomizing chamber 65, in a direction diagonal of the flow of incoming atomized liquid gasoline which is forced through the nipple fitting 24 by the air under pressure from the fuel supply tank. Between this atomizing chamber 65 and the nipple 26 which leads to the generator, the automatic valve housing is provided with a valve seat 66 upon which a needle valve 61 may come to rest for completely shutting off the flow of fuel to the generator. This needle valve 61 is in the form of a stem 68 having an abutment 69 thereon for engagement with one end of a packing gland ill to limit the fully opened position of the needle valve. This stem extends on through this packing gland 10 to terminate in a handleG adjacent the front of the stove and directly in front of the primary burner 29. Directly above this valve operating handle G is disposed the operating handle M of the needle valve associated with the generator tube which will be presently described.

The inner end of a needle valve 61 is twice reduced as at H and again at 12 to form an atomizing effect with a restricted inner bore of the nipple fitting 24 which admits gasoline to the automatic valve. With the gasoline valve of the tank open and a head of air in this tank, raw gasoline will be forced through the nipple 24 and past the atomizing needle 12 into chamber 65 to be somewhat atomized, by the air under pressure from the nipple 23 passing valve 26 and through the port 64, to thoroughly atomize the fuel and cause its existence in chamber 65 in the form of a fog which passes on out to the generator 28 when the valve 66 is manually opened. The automatic valve casing is suitably supported on a bracket 13 depending as. an integral part of the main burner casting.

The air valve 56 is normally held open against the compression of spring 62 by means of a valve stem 6| being connected to a thermostatic rod 14 which when heated expands and, relaxes tension on the air valve stem SI and permits the air valve 56 to seat under the expansion of coil spring 62 so as to automatically out off air under pressure from the fuel tank. This thermostat I4 is supported immediately to one side of the generator 28 and above the finger burner 46. One end of the thermostatic rod is rigidly mounted in an upstanding lug 15 cast integral with the main burner 29, while the opposite end of the thermostatic rod passes through the upper end of a lever 16 fulcrumed as at H upon a forwardly extending lug 18 cast upon the forward side of the main burner 29. The movable end of this thermostatic rod 16 is provided with a pair of nuts so that the relationship of a thermostat and valve may be varied at will. The output end of lever 16 is forked to straddle air valve stem BI and slides freely thereon when the thermostat expands and releases the lever 16. A pair of lock nuts 19 are threaded upon the outer end of valve stem 6| to form an abutment for the lever so that upon contraction of the thermostat 14 the lever is moved clockwise to lift the valve 66 from its seat against the tension of valve spring 62.

The generator 28 for vaporizing the fuel consists of an elongated tube as usual arranged above the finger burner 46 and is provided with a lateral nipple 80 to receive the fuel mixture from the automatic valve through pipe 21. The inner end of the generator tube is reduced and rigidly secured in the forward end of the carburetor 30 and is there provided with an atomizing nozzle 8| which is reamed out to provide a mix ing chamber 82. The generator tube proper is provided with an integral valve seat 83, upon which seats a needle valve 84, which is closed when the generator is not operating. This needle valve 84 has threaded connection with the generator tube as at 85 and continues on through the tube and beyond the same in the form of a valve stem 86 terminating in a handle beyond the packing gland 81 for the generator M.

Assuming that the stove is not in operation and it is desired to light the burners thereof, the fuel tank is pumped up to provide a head of .air therein and the valve fittings l and I8 are opened permitting the compressed air in the tank to force the liquid fuel up through the tube 26 and thence through pipe line I9 to the automatic valve. Assuming that the thermostatic rod 14 is contracted, the air valve 56 in the automatic valve will be open permitting air under pressure to pass from the tank through the pipe I! into chamber 63 thence through port 64 to be directed against the atomized gasoline entering chamber 65. The needle valve 61 is then opened permitting the atomized fuel to pass through pipe 21 into the generator tube at 80 and thence through the same, in the form of a fog, past valve seat 83 into the carburetor 36 and thence into the distributing chamber. From here, the fog passes through branch 43, port 45 into the finger burner 46 from which the fog is emitted and can be immediately ignited by striking a match thereto. The flame from this finger burner 46 heats the generator and vaporizes the fuel passing through the generator. As the heat from the finger burner is continued, it causes the thermostatic rod 14 to expand gradually thereby releasing compression on the spring 62 of the automatic valve until such time as the thermostat is expanded sufiiciently to permit the air valve 56 to seat upon its seat 55 and thereby cut off air under pressure from the fuel supply tank. From this time on in the operation of the stove, only gasoline passes through the automatic valve to the generating tube where it is sufficiently vaporized to combine with the air drawn in through the carburetor 30 to form an efficient fuel which can then pass from. the distributor 32 to all burners which can be ignited by simply opening their respective valves. Should all of the burners be accidentally extinguished, the thermostat will contract, thereby opening air valve 56 permitting the air under pressure in the tank to be exhausted therefrom which will automatically stop the flow of gasoline from the fuel supply tank to the burners. Under these conditions after the air valve is open for a short interval of time, the supply of air under pressure in the fuel tank will become completely exhausted so that only a few tablespoons of raw gasoline escape into the manifold while the burners are turned on and this accumulation can be readily drained through the pet cook 42.

It will be understood that various changes in the size, shape and arrangement of parts may be resorted to without departing from the spirit of the invention or the scope of the appended claims.

I claim:

1. In a gasoline pressure stove, a pressure fuel tank, a generator, a generator burner, an automatic valve in proximity thereto having a normally open spring closed air valve and stem and a manually controllable fuel valve, a thermostatic rod having one end fixed to the rear of said generator burner, a lever fulcrumed on the front of said burner, the other end of the rod sliding through a long end of the lever, and the other shorter end of said lever having a sliding connection with the valve stem whereby expansion of the rod permits the air valve to automatically close.

2. In a gasoline pressure stove, a generator, a generator burner, an automatic valve located in proximity to the burner and having an air chamber, said valve also having an air port communicating With said chamber .and a manually controllable liquid fuel valve, an air port extending from said air chamber to the liquid fuel valve, a diaphragm in said air chamber, a normally open .air valve connected with said diaphragm, a valve rod connected to said diaphragm, a spring associated with said rod and normally urging the air valve toward its seat, and a thermostatic element operatively connected to said air valve stem for automatically unloading the spring to close the valve upon expansion of the thermostatic element.

3. In a gasoline pressure stove, a pressure fuel tank, a generator, a generator burner, an automatic valve supported below said burner and having a normally open spring closed air valve and a stem with a shoulder, a manually controllable fuel valve, a thermostatic rod arranged above the burner and having one end fixed to the rear of said generator burner and an abutment on the other end of said rod, a lever having long and short arms and fulcrumed on the front of said burner, the other end of the rod sliding through a short arm of the lever and the abutment on said rod being adapted to engage said lever as the rod contracts, and the other longer arm of said lever having a sliding connection with the valve stem whereby expansion of the rod permits the air valve to automatically close, and said lever engaging said shoulder of the valve stem to open the valve as the thermostatic rod contracts.

4. In .a gasoline pressure stove, a generator, a generator burner, an automatic valve located in proximity to the burner and having an air chamber, said Valve also having an air port communicating with said chamber and a manually controllable liquid fuel valve, an air port extending from said air chamber to said liquid fuel valve, a recessed packing nut screwed into said chamber, a valve rod slidable through said nut, a diaphragm held in said chamber by said nut, an enlarged head slidable in said recess of the nut, a spring in said recess bearing against said head, a valve head having a reduced threaded extension extending through the diaphragm, head and threaded into the end of the valve rod, and a thermostatic element connected to the valve rod for normally holding the valve head open against the tension of said spring.

CLYDE W. MUMMERY.

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