US301608A - John johnstons - Google Patents

Description

(No Mode.)

J. JOHNSTONE.

OVEN FOR COOKING STOVBS.

N PETEns Pnaloumgnpw. wm-ngnm D.c.

, i UNITED STATEs PATENT OFFICE.

JOHN JOHNSTONE, OF DETROIT, MICHIGAN.-

OVEN FOR COOKING-STOVES.

SPECIFICATION forming part of Letters Patent No. 301,608, dated July 8, 1884.

' Application {ilcd June 13, 1883. (No model.)

.To `(1J/Z whom, it may concern Be it known that I, JOHN JoHNsroNE, a citizen of the United States, residing at Detroit, in the county of "Wayne and State of Michigan, have invented a new and useful Oven for Cooking-Stoves, of which the following is a specifi- `ehamberat .t m in Fig. 1.

Like letters indicate `like parts in the iigures.

In the drawings, A A A representthe outer .walls or casing of a stove, which in the present example are extended at the right to form awarmingcloset, G. In the top plate, A, three holes, F, li", and F2, are shown for the reception of the usual culinary vessels. rIhe hole F2 is surrounded by a denticulated collar to permit the fumes to escape when liquid fuel is used; but when wood, coke, or coal is used the usual stove-pipe is slipped on to connect it with a chimney.

l) is the combustionchamber, which, in the latter class of stoves, would be fitted with the usual grate, draft-register, the.; but in the' present example the flames enter through the wick-cones I-I in the bottom.

M represents the casing of a door, through which the wicks are lighted.

B B B are the top, end, and bottom plates, which, with the front and back plates A and the wall of the chamber D, form the oven L.

The top plate B is extended to form the top of the hot-closet G, and the space between the top plates A B forms the ilue l for the exit of the gaseous products of combustion.

Gis a continuous U-shaped ilue, formed by the above-described plates,and extends around.

the front or left end oi" the combustion-chamber, terminating at the top plate B.

E E E arehorizontal fines, opening a communication between the front leg ofthe flue O and the interiorof the oven at the top. These dues E are so shaped and placed, and in such number as to form a chimney-throat for each wick-flame, as well as to absorb its heat and .transmit it to the current of air passing into the oven through it. In thelower right end of the oven is an outlet-register, J', through which the less heated and heavier air passes out of the oven, thence along the bottom of the front leg of the flue O to the horizontal duesE, in which it is reheated on its way into the oven again. Thus it will be seen that a continuous circulation of heated air iskeptup through the oven, while the products of combustion pass out directly over it.

To regulate the temperature of the oven' (which would otherwise be too high) a checkregister, J, is placed in the front end of the outer casing to admit cold air to the iiuesE in such volume as may be necessary.

The warming-closet G is heated indirectly that is to say, without a positive circulationthrough a register, J2, opening a communica tion with the lower part of the right leg of the flue C, the difference in density of the airinthe upper and lower parts of this closet being relied on to effect asuilicient movement through said register J 2 to accomplish thepurpose. l As the air in the rightleg of the iue O might become stagnant and merely serve as a non-con 'duct0r, I pierce a fewsmall apertures th rough the top partioi' the oven-plate, thereby opening a communication with said ilue, when the circulation proceeds in the direction of the arrows, as shown.

I am aware that open nir-iiues have been used connecting with th e space between the iirebox and the oven, as shown in Patent No. 35,141, of 1862. In my construction the coldair dues Vextend through the fire-box and into the oven direct. IIn the patent referred to there is a separate chamber between the firebox and oven and between the fire-box and the sides ofthe stove, while in my device the ilues E give an extended heating-surface directly within the drehen', and the heated air from such ilues passes directly into the oven.

I deem it important that there is no connection between the oven L and the combustionchamber. The products of combustion are checked by the form given toV the reheatinglues E E, but have a direct passage from the combustion-chamber to the outlet over the warming-chamber.

I attach importance to the i'lues E passing IOO directly through the fire-box to give an extended heating-,surface therein, and to their connecting the iiues G and the open-air passages directly with the interior of the oven. I attach importance to the voven and its continuous air-passages arranged entirely distinct from the combustion-chamber and its passages, and having its independent means for admitting cold air directly to the reheating-iiues.

I also attach importance to thearrange-ment of the Warmingchamber G in its relation to the oven, its hot-air passages, and the means for utilizing a portion of the Waste heat from the `said oven by directing it into said Warmingchamber.

What I claim as new is l. Ina direct-draft cook-stove, and in com-fl -bination with the combustion-chamber thereg of and anoven, as L, a continuoushot-air pasl sage distinct from the combustion-chamber, formed in part by said oven and in part by. flues extending through the fire-box to afford 1 an extended heating-surface, and mea-ns fori admitting cold air to said air-passage, as set? forth..

2. In combination with the combus'tionchamber D, oven L, and iiues C, the heatingiues Epassing through the ire-cha-mber D to t afford an extended heating-surface Within said 3o nre-chamber, and'leading directly to the oven from the flues C and from the outer air, as herein specified.'

3. In combination with the oven L, the coinbustion-chamber D, and the continuous airpassage formed in part by said oven, theheating-lues E, passing through and formed inthe structure of D to afford an extended heatingsurface Within said fire-chamber, and connecting the oven and air-nues C, and the cold-air register leading directly to said iiues E, as

C on the same `horizontal plane, as set forth.

Joran Joiiusronn.

Witnesses:

ALLAN H. FRAZER, L. W. FRAZER.

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