US742161A - Downdraft-stove. - Google Patents

Description

No. 742,161. PATENTED OCT. 27, 1-903.

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Patented October 27, 1903.

. PATENT "OFFICE.

EDWIN R. OAHOONE, OF TROY, NEW YORK.

DOWNDRAFT-STOVE.

SililGiFICATIOhT forming part of Letters Patent N 0. 742,161, dated October 27, 1903.

ilriginal application iiled May 12; 1899, Serial llo. 716,556. Divided and this application filed March 10, 1902. Serial No. 973550. (No model.)

To 0% whom it may concern.-

Be it known that I, EDWIN R. CAHOONE, a citizen of the United States, residing at Troy, in the county of Rensselaer and State of New York, have invented certain new and useful Improvementsin Downdraft-Stoves; and I do declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, and to the figures of reference marked thereon, which form a part of this specification.

This invention relates to improvements in downdraft-stoves, and more particularly to the fire-pot, and formsa division of my pending application, filed May12, 1899, Serial No The object of the invention is to provide in a fire-pot structure a series of individualsections having ducts communicating with the.

atmosphere and through which air passes to the fuel for the purpose of promoting combustion.

my purpose to provide each section with a head and a reduced extension extending therefrom to the stove-casing, so that as the products of combustion leave the fire-pot toward the exitflue the extensions become highly heated thereby, and the ducts being formed in the extensions the air entering from the atmosphere likewise becomes heated and in this condition is delivered to the mass of fuel under the influence of the draft.

A further object of my invention is to introduce air downwardly to the fuel, from whence it is drawn through the body thereof under the influence of the draft, in combination with the specific means for introducing heated air through the fire-pot sections to the mass of fuel from the sides-that is to say, by providing an extension and a head therefor the air in being drawn through the fuel pulls, as it were, the heated-air currents introduced to the fuel sides downwardly below the extensions. Hence when the products of combustion rise to escape it necessarily follows that the extensions are in the path thereof.

In the embodiment of the invention it is duct.

With these primary objects in view the details employed to carryout the same will now be described.

In the drawings, Figure 1 is a vertical section of a downdraft-stove, showing the application of my invention. Fig. 2 is a horizontal section of the same on the line A A, Fig. 1. Fig. 3 is a detail horizontal section of a fire-pot section on the line B B of Fig. 1.

Fig. 4 is a detail vertical section of a fire-pot,

illustrating a modification of my invention. Fig. 5 is a detail vertical section of a modification of fire-pot section. Fig. 6 is a horizontal section onthe line C G of Fig. 1. I

The numeral 1 represents a stove-casing; 2, a fire-pot; 3, a space intermediate the firepot and casing; 4; the exit-flue, and 5 the tubes for introducing currents of air to the fuel.-

The fire-pot iscomposed of an upper portion 6 and lower portion 7. The portion 6 is in this instance of'ringlike formation and tapers internally and bears interior grooves '8, while the portion 7 is composed of a plurality ofiudividual sections 10. Each sec- 1 tion 10 comprises a hollow head 11, slightly inclined upwardly and on which rests the upper portion 6. The front of the head has a plurality of grooves 12 to permit the free passage of air around the fuel. Extending outwardly from the head 11 to the casing. 1 is a reduced hollow extension 13, forming an air- This duct at its mouth somewhat tapers and communicates with the hollow head, and as the walls of the latter are of approximate bell shape the air is delivered to the fuel in an expanded condition. When it is borne in mind that the air in entering the duct is drawn in by the draft with considerable force it becomes condensed, and in the meantime is being highly heated, which adds also to its tendency to force its way out, with the draft. So that in order to utilize this condensed heated air when burning immediately attack the fuel and ignite the gases, a damper 14: being arranged adjacent the open ends of the sections to regulate the admission of air to the ducts. The individual sections being thus constructed, they are arranged side by side with a slight space 15 between them for the passage of the products of combustion. \Vhen thus arranged, the portion 7 forms somewhat of a tapering basket-like fire-potheld and braced by the extensions 1.3.

A fire having been started when the parts are assembled, air is fed to the fuel from the top through the tubes 5, while numerous radial heated air-currents are fed to the fuel from the sides thereof. The two sets of aircurrents--those coming from the top and those from the sides-meet and mingle, creating a multiplicity of resistances,which tends to materially increase the grade of combustion. The air-currents from the top while mixing with those from the sides force the latter downwardly, and by reason of the peculiar shape of the bell there is a tendency to throw the air toward the center of the fuelbed. However, there is a limit to this throw, whereupon the draft in ascending to the exitfiue takes hold and pulls the escaping products of combustion out through the spaces 15 into the space 3, from whence they escape. Hence all the escaping products of combustion contact either directly or indirectly with the extensions 13, absolutely insuring the thorough heating of the air prior to its introduction to the fuel. Moreover, the air-currents from the ducts opposite each other, introducing air at varying angles, necessarily forces some of the air-currents between the edges of the fuel,and to allow its passage therebetween and the heads 11 the grooves 12 are provided. By this construction it will be seen that it matters not what condition the lay of the fuel may be the requirements necessary to meet the circumstances are presout.

In the modification shown in Fig. 4 the head 11 is covered and perforated, as at 11 The perforations incline downwardly and tend to direct the air toward the center of the fuel.

In the modification shown in Fig. 5 the preferred form and modified form of sections are combined. The action and results being obvious, it is thought further description is unnecessary.

From the foregoing description, taken in connection with the accompanying drawings, it is thought the advantages of my invention will be readily comprehended by those skilled in the art to which it appertains.

Having thus fully described my invention, what I claim as new is- 1. A fire-pot comprising a plurality of hollow sections, which sections have air-discharge openings and hollow ducts adapted to extend through the side of a stove.

2. A fire-pot, comprising a plurality of hollow sections having hollow ducts adapted to extend through the side of a stove, each of said sections being adapted to receive a supply of air direct from the atmosphere and deliver the same to the fire-pot, and means for heating the ducts. V

3. A fire pot comprising a plurality of spaced-apart sections, each section having an extension which has formed therein a duct adapted to receive a supply of air direct from the atmosphere and deliver the same to the fire-pot, and means for heating the extension.

4. A fire pot comprising a plurality of spaced-apart sections, each section having an extension which has formed therein a duct, said duct communicating with and adapted to receive a supply of air from the atmosphere and deliver the same to the fire-pot, the extension being located to be heated by the escaping products of combustion.

5. A fire pot comprising a plurality of spaced-apart sections, each section having a head and a hollow radial extension, said extension being smaller in cross-section area than the head, and means for heating the radial extension from the under side.

6. A fire-pot comprising a plurality of sections, each of said sections being formed with a duct which is of tapering formation at its inlet and 0f oppositely-tapering formation at its outlet, and means for heating the sections.

7. In a stove, the combination with a casing, a fire-pot composed of an upper and lower portion, the lower portion comprising a plurality of spaced-apart sections each section having an air-duct which communicates direct with the atmosphere, the upper portion having its side walls closed and resting on the lower portion, and means for heating the air-ducts.

8. In a stove, the combination with a casing, a fire-pot composed of an upper and a lower portion, the lower portion comprising a plurality of spaced-apart sections, having ducts which communicate with the atmosphere and the fire-pot, the upper portion having its side walls closed and provided on its inner walls with a plurality of varying grooves coacting with the spaces intermediate the sections of the lowerportion, and means for heating the ducts.

9. In a downdraft-stove the combination with a casing, an exit-flue, a fire-pot having a plurality of spaced-apart sections provided with ducts which communicate with the atmosphere and the fire-pot to deliver heated air to the fuel, a space being formed intermediate the fire-pot and casing, means for delivering air to the fuel above the air introwith a casing, a fire-pot having a.plurality of spaced-apart sections provided with ducts which communicate with the atmosphere and the fire-pot to deliver heated air to the fuel, a space being formed intermediate the firepot and casing, an exit-flue communicating with said space and at a point above the sections, and means for delivering individual I currents of air downwardly to the fuel, said air-currents together with the air-currents delivered through the air-ducts being drawn into and through the fuel and around the air ducts under the influence of the draft.

11. A section for a fire-pot comprising a head, and a radially-projecting reduced hollow extension through which and the head air may pass.

12. A fire-pot comprising a plurality'of

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