US1459868A - Electric stove - Google Patents

Description

'June 26, 1923.

W. R. WILLIAMSON ELECTMG sTovE Filed Oct. 10, 1921 2 Sheats-Sheet 2 Patented June 26, 1923.

PATENT OFFICE.

WILLIAM RALPH \VILLIAMSON, OF THAYER, MISSOURI.

ELECTRIC STOVE.

Application nica october 1o, 1921.

To all whom t may concern:

Be it known that I, WILLIAM RALPH l/VIL- LiAMsoN, a citizen of the United States, residing at Thayer, in the county of Oregon and State of Missouri, have invented certain new and useful 'Improvements in Electric Stoves, of which the following is` a specification, reference being had to the accompanying drawings.

This invention relates to stoves, particularly to those of the electrically operated type, and has for its object the provision of a stove embodying an electric heating coil which operates to convert water within the boiler into steam, the steam being; consequently discharged into a heating drum having a large radiating surface whereby full advantage may be taken of all the heat units generated within the device.

An important object is the provision of a stovefof this character in which automatic means is provided for cutting olf the elec-tric current in case the water supply within the stove becomes nearly exhausted so that danger of burning out the stove will be eliminated.

Another object is the provision of means whereby the steam issuing from the boiler will be to a certain extent superheated so that when it is .subsequently discharged into the heating drum it will be in a practically dry state so that comparatively little water of condensation will accumulate within the drum, means being provided, however, for removing such condensation.

Yet another Objectis the nrovision of a; device of this character in which the various component parts are held together by simple securing means whereby they may be easily disassembled for the purpose of cleaning or making repairs and the like. l

An additional object is the provision of a stove of this character which will be simple andv inexpensive in manufacture, automatic in operation, highly efficient in use, durable in service and a general improvement in the art.

With the above and other objects and advantages in view, the invention consists in the details of construction to be hereinafter morefully described and claimed, and illus- Serial No. 506,614.

trated in the accompanying drawings, in

which:

Figure 1 is a longitudinal sectional view through my stove; y

Figure 2 is a longitudinal sectional view through the upper portion thereof, the view taken at right angles tof Figure 1;

Figure 3 is a horizontal sectional view on the line 33 of Figure 2; and

Figure 4 is a detail view of the fuse structure.

Referring more particularly to the drawings, I have shown my stove as comprising a cylindrical drum 10 formed of sheet iron or the like and including a base portion 11 provided with a. plurality of support-ing feet 12. This drum is formed with a central opening or flue 13 whichleads to the bottom 111 of the drum and also entirely to the top 15 thereof. Secured at the upper portion of the drum is a ring 16 which serves as a reinforcement and which may be made more or less ornamental depending upon the taste of the manufacturer. The ring 16 is located slightly below the upper end of the drum so that a portion of the latter will extend above the ring for a purpose to be described.

Located at one side of the drum near the upper portion thereof is a threaded nip-ple 17 into which is screwed one end of an angularly shaped steam outlet pipe 1S carrying a spray nozzle 19. The purpose of this pipe 18 is to permit of the discharge of steam from the interior of the drum, as will be hereinafter explained.

In association with the drum I provide a boiler which includes a relatively large cylindrical upper portion 2O at the lower portion of which is formed a flattened chamber portion 21 from the under side of which extends a greatly reduced portion 22 which fits within and is coextensive in length with the flue 13. The lower extremity of this portion 22 is formed with a drain opening normally closed by a plug 23, this plug being removable whereby all the water within the boiler may be drained out so as to permit cleaning and flushing thereof to prevent incrustation and scaling. This boiler is adapted to contain water up to the line 24 which designates the maximum water level.

The top of the boiler is provided with a filling neck normally closed by a threaded plug 26 having a` hand hold or finger grip.

The upper portion of the boiler is pro vided with a nipple 27 with which connected one end of a coil 28 which constitutes a super-heater and the lower end or' this coil is connected with a T 29 which is interposed in a U-shaped pipe 30 which has its arms` extending downwardly and connected, by means ot' unions 31, with the'upper ends oi pipes 32 which extend downwardly within the drum near the wall thereof.

The heating means comprises a sleeve or collar 33 which is mounted upon the cylindrical portion Q0 of the boiler immediately above the chamber 21 and this sleeve or collar is preferably provided with an apron 34 partially overlying the chamber 2l.. Mounted upon this sleeve or colla-r is a heating coil 35 of a conventional type from which lead wires 36 and 37 which are connected with a control switch 38 suitably mounted upon the outside of the drum or casing, preferably upon the ring 16, and this switch may be more or less of a rheo stat type whereby the strength of the current supply to the heating coil 35 may be varied. The numerals 39 and 4() designate current carrying` wires which are connected with any suitable source of current diagrammatically illustrated at 41.

In order to cut off the 'low ot current automatically in case the supply ot' water within the boiler becomes so low as to endanger burning out the stove, I provide a pair of plugs 42 suitably secured at the edge of the chamber portion 21 and which carry a piece of 'fuse wire 43. @ne ot the wires 37, or both if preferred, is wrapped about the fuse wire 43 so that in the event of overheating oil the stove, the fuse wire 43 will melt and will burn the wire or wires 37 so as to break the circuit. The heating coil is enclosed by an inverted cup 44 which is formed with a hole so that it may be held downwardly upon the cylindrical portion 2O of the boiler into engagement with the top of the chamber Q1, this cup being formed at its edges with notches 45 engaging upon lugs 46 on the chamber so that the cup will be held properly in position.

In order that all these parts above described at the upper portion of the stove may be suitably housed, I provide a cover 47 which has its lower end fitting upon the top of the ring 16 in snug engagement with the portion of the drum which projects above the ring and this cover is provided at its top with a hole 48 through which access may be had to the filling neck and cap of the boiler so that the supply of water may be replenished from time to time.

Associated with the upper portion 20 ot the boiler is a gauge which includes pipes 49 and 50 communicatingv with the boiler at diillerent levels and connected by a pipe 50a. The lower mounting of the gauge is provided with a valve 51 which may be opened to test whether the water within the boiler is above the level of the pipe 49. Below this valve 51 the cover 47 carries a drip box 52 tor receiving any water which may drip from the valve 51. The cover 47 is provided with an opening 53 through which this gauge structure projects and this opening is covered by a small door 54 which serves as a protection for the gauge to prevent injury thereto.

Assuming that the device has been constructed and assembled as above described, the operation is as follows: The boiler is filled with water up to the level 24, which is the level at which the uppermost gauge pipe 49 leads into the boiler lVhen the switch 38 is closed to supply current to the heating coil 35, it will be apparent that the sleeve 33 and apron 34 will become hot and this heat will be communicated to the boiler so that the water therein will be eitectually heated. it the same time considerable heat will radiate from the coil and adjacent parts so that the space within the cover 47 will always be hot and this heat within the cover will serve to super heat steam which is generated within the boiler and which passes through the coil 28. It, oi' course, takes some little time for the water to become suiliciently hot to cause the generation of steam but when such has generated it will pass 'from the boiler through the coil 28 where it is super heated or dried and will then pass through the U-shaped pipe 30 into the pipes 32 which discharge within the drum. This steam entering the drum ot course heats it so that a large amount of heat will be given oit in the 'form oi radiations irom the drum. Furthermore, the heat within the drum acts to heat the water within the lower port-ion 22 of the boiler so that no heat is wasted. Surplus steam within the drum 10 of course escapes through the discharge pipe and spray nozzle 13 and 19 respectively so as tol avoid bursting of the drum. lllhen in the course of time any accumulation of water condensation occurs within the drum. it is apparent that such may be removed by means of a drain cock 55 at the bottom of the drum. It is of course to be understood that the switch 38 may be opened at. any time tor discontinuing energization oit' the heating coil 35 when the stove is suiliciently hot, though it will be noted that in case of overheating, as for instance when caused by too low a water level, the fuse wires 43 will burn and break the electrical connection.

From t-he foregoing description and a study of the drawings it will be apparent that l have thus provided. a simply conlOll lllfi structed and consequently inexpensive stove which uses electricity as the heating medium, ample means being provided for automatically controlling the current to avoid danger of burning out the stove. Owing to the peculiar arrangement of the parts it will be apparent that all the heat units generated within the device will be utilized and none wasted so that the device will efficiently opv erate to perform all the functions for which it is intended.

While I have shown and described the preferred embodiment of the invention, it is of course to be readily understood that I reserve the right to make such changes in the form, construction and arrangement of parts as will not depart from the spirit of the invention or the scope of the subjoined claims.

Having thus described my invention, I claim:

l. A stove of the character' described comprising' a drum provided with a steam outlet pipe, a boiler located above the drum, a pipe leading from the upper end oi the boiler and coiled to define a super heater coil, a U- shaped pipe connected with said super heater coil and connected with pipes leading downwardly into the drum for discharging steam into the latter, and a heating coil carried by the outside of the boiler.

2. A stove of the character described comprising a drum formed with a central flue, a boiler having its major portion disposed above the drum and formed with a reduced portion fitting within said liuc, a sleeve upon the boiler, a heating coil carried by the sleeve, a super heater coil connected with the upper end of the boiler, pipes connected with said super heater coil and leading down into the drum at opposite sides thereof, and an outlet pipe for the drum.

A stove of the character described comprising a drum formed with a central flue, av steam outlet pipe connected with the drum and carrying a spray nozzle, a boiler having a relatively large portion located above the drum and a relatively small portion fitting within saidl flue, said boiler being formed intermediate its ends with an enlarged chamber portion engaging upon the top oit' the drum, a sleeve surrounding said lirst named portion of the boiler and having an apron overlying said chamber portion, means for applying heat to said sleeve, the top of the boiler being formed with a filling opening normally closed by a plug, a gauge associated with the upper portion of the boiler, a cover detachably engaged upon the upper end of the drum and closing the portion of the boiler thereabove, and steam pipes connected with the top ot the boiler and leading down within said cover and terminating midway within the drum.

4. A stove of the character described comprising a drum formed with a central Hue, a

steam outlet pipe connected with the drum and carrying a spray nozzle, a boiler having a relatively large portion located above the drum and a relatively small portion fitting within said flue, said boiler being formed intermediate its ends with an enlarged chamber portionengaging upon the top ot the drum, a sleeve surrounding said lirst named portion of the boiler and having an apron overlying said chamber portion, means for applying heat tosaid sleeve, the top of the boiler being formed with a filling opening normally closed by a plug, a gauge associated with the upper portion of the boiler, a cover detachably engaged upon the upper end of the drum and closing the portion oi the boiler thereabove, steam pipes connected with the top of the boiler and leading down within said cover and terminating' midway within the drum, the heating' means consisting or a heating coil mounted upon said sleeve, and a control switch carried by the drum, connected with said coil and adapted for connection with a source of current.

5. A stove of the character described comprising a drum formed with a central flue, a. steam outlet pipe connected with the drum and carrying a spray nozzle, a boiler having a relatively large portion located above the drum and a relatively small portion iitting within said iue, said boiler being formed intermediate its ends with an enlarged chamber portion engaging` upon the top ot' the drum, a sleeve surrounding said first named portion of the boiler and having an apron overlying said chamber portion, means for applying heat to said sleeve, ythe top of the boiler being formed with a filling opening normally closed by a plug, a gauge associated with the upper portion of the boiler, a Cover detachably engaged upon the upper end of the drum and closing the portion of the boiler thereabove, steam pipes connected with the top oi the boiler and leading down within said cover and terminating midway within the drum, and a super heater coil interposed in said steam pipe.

6. A stove ot' the character described comprising a drum provided with a steam outlet pipe, a boiler having portions thereof disposed within the drum, a connection between the upper end of the boiler and the drum, and a heating coil carried by the boiler.

7. A stove of the character described comprising a boiler, a drum closing a portion of the boiler and having a steam outlet pipe, a super heater connected with the upper end of the boiler and with the drum, and electrical heating means for the boiler and super heater.

8. In a stove of the character described, a boiler, electrical heating means for the boiler in circuit with a source of E. M. F., and a fuse wire in circuit with said heating means and source of E. M. Fund flisposeclupon the surace o the boiler below the level of the Water therein.

9. ln an electrical stove7 a. boiler, und electrical heating means for the boiler having 'circuit including a fuse Wire, said fuse Wire being disposed upon the surface of the boiler to he cooled by the 'fluid therein Whereh),T

lowering of the level Within the boiler to :i point below the point of attachment of the l0 fuse Wire will automatically disconnect said electrical heating element.

In testimony Whereoil I hereunto atlix my signature.

WlLLlAM RALPH WILLIAMSON.

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