US2578408A - Heating stove with hot cupboard - Google Patents

Description

Dec. 11, 1951 J. ESSELSTROM HEATING STOVE WITH HOT CUPBOARD Filed Feb. 18, 1948 Jon EsscLsTR INVENTOR Patented Dec. 11, 1951 UNITED STATES HEATING STOVE WITH HOT CUPBOARD Joel Esselstriim, Esse, Finland Application February 18, 1948, Serial No. 9,240 In Finland October 15, 1940 Section 1, Public Law 690, August 8, 1946 Patent expires October 15, 1960 1 Claim. 1 This invention relates to heating stove provided with a hot cupboard.

According to the invention air tubes around the stove firebox are used to supply heated air into the hot cupboard. The walls of the firebox may be composed of groups of spaced air tubes of this character, the upper ends of which tubes open into the cupboard. At their lower ends the said tubes may communicate with a chamber which is adapted to be fed under control of suitable valves or dampers not only with outside air for supplying to the tubes, but also air from the hot cupboard for recirculation through them. The tubes of those groups forming the top and bottom of the firebox may be angular with upright portions connecting with the hot cupboard, which last mentioned portions in the case of the tubes whose lower limbs form the bottom or grate, serve as the back of the firebox. The tubes of those groups composing the sides of the firebox may, on the other hand, be straight and vertical throughout, other similar straight vertical tubes being provided if desired also behind the upwardly bent tubes which form the grate and back of the firebox as aforesaid.

The invention will now be described with reference to the accompanying drawings in which an embodiment is shown b way of example, and of which Figure l is a perspective front View and Figure 2 a cross section from the side of the said embodiment.

In these drawings, the firebox of the stove is designated I with air inlets l, and the walls of the said firebox are composed of spaced tubes 2 arranged in groups. Those of the tubes which lie above and below the firebox are angular with their lower limbs by which the firebox is bounded opening into a chamber 6 at the front of the stove, which chamber is provided with a controllable air inlet 6'. The other limbs of the said angular tubes are disposed vertically to discharge into the bottom of the hot cupboard 8, the interior of which is provided with shelves 9 for supporting food or the like to be warmed. Those of the pipes at the sides of the firebox and at the extreme back of the stove are straight and vertical with their lower ends opening for example into an extension of chamber 6 beneath the stove, and their upper ends discharging into the bottom of the hot cupboard in the same way as do the upright portions of the angular tubes.

The combustion gases pass from the firebox through spaces I2 between and around the various tubes and finally through openings l3 into the flue 4. The air in the hot cupboard is able to leave it under control of damper 7 by way of duct l4 extending down into chamber 5 for recirculation, but may alternatively be allowed to escape outside the stove if damper 7 is suitably modified for the purpose, or a further damper which is not shown in the drawings is provided. In absence of such re-circulation, the tubes 2 must of course be fed with air entirely from out- 2 n side the stove. The duct [4 is arranged to pass close by the openings l3, so that remaining heat of the escaping flue gases can be abstracted by the air passing down the said duct for recirculation.

Other parts not hitherto referred to but shown on the drawings are: the base 5 on which the stove stands; dampers ill by which the individual shelves in the hot cupboard can be cut oil more or less completely from the stream of hot air; and base H for supporting the said shelves.

I claim:

A heating stove providing for circulation of heated air, which comprises a firebox, said firebox being constituted at the top and bottom thereof by a plurality of angularly bent tubes, and being constituted at the sides and back thereof by a plurality of vertically extending tubes, said angularly bent tubes each having a lower inclined portion and an upper portion extending substantially parallel to said vertically extending tubes which form the sides and back of said firebox, a first chamber in said stove, said chamber being in communication with the outside air, said chamber also being in communication with the inlets to said angularly bent tubes at the lower inclined portions thereof, a second chamber at the upper portion of said stove, said second chamber being in communication with the outlet ends of said angularly bent tubes at the terminus of the vertical portions thereof, and also in communication with the outlet ends of said vertically extending tubes, at the upper portions thereof, and a conduit providing communication between said second chamber and said first chamber, the lower ends of said vertically extending tubes being in communication with said conduit, whereby air which enters said first chamber of said stove from the outside is heated in said tubes, rises to said second chamber, and returns to said first chamber through said conduit for further reheating, thus providing efficient circulation of heated air.

JOEL ESSELSTROM.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS FOREIGN PATENTS Country Date Germany Aug. 30, 1879 Number Re. 1,027 4,719 148,419 301,608 310,623 977,408 2,417,842

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