US19956A - Cooking-stove - Google Patents

Description

J. SPEAR.

Cooking Stove.

' Patented April 13, 1858.

UNITED STATES PATEN T OFFICE.

JAS. SPEAR, OF PHILADELPHIA, PENNSYLVANIA.

COOKING-STOVE.

Specification of Letters Patent No. 19,956, dated April 13. 18558.

To all whom it may concern:

Be it known that I, JAMEs SPEAK, of the city and county of Philadelphia, in the State of Pennsylvania, have invented certain new and useful Improvements in Cooking-Stoves; and I hereby declare that the following is a full, clear, and exact description of the same, reference being had to the accompanying drawings, making part of this specification, in which Figure 1 is a perspective view of a cooking stove with my improvement attached, one side of the stove being removed, and Fig. 2 a bottom view of the center piece.

My improvements relate to the means by which minute jets of heated air are introduced at pleasure into cooking stoves or ranges immediately above the ignited fuel, for the purpose of aiding the conversion into flame of the greater portion of the gaseous products of combustion, which would otherwise pass off through the flues without being consumed.

I effect the above object in the present instance by a hollow center piece (p) formed with a perforated bottom piece, which is connected at b, with the branches t which pass through the flues of the oven, following their course, and communicating by openings 0 at two points with the external air, the admission of which is controlled and regulated at pleasure by covers or slides a. The air, heated in its passage through the tubes, is ejected in numerous jets as indicated by the darts, thoroughly mixing with and causing the ignition of the gases, the fiame from which, passing through the flues, heats the oven or other portions of the stove with which it comes in contact, much more quickly and produces a greater amount of heat from a given quantity of fuel. The above described construction has the additional advantages of strengthening the center piece, and protectmg it from the destructive effect of excessive heat by the non-conductive property of the air contained therein. The same ar rangement and construction may be applied to the front center piece immediately over the fire with similar resulting advantages. A very superior effect is produced in the lgnition, and consequent utilization of the gaseous products of combustion, by the application of jets of heated air upon the upper surface of the fire, to that which is experienced from the admission of cold air, above the fire through the fuel opening f, or any other opening, communicating directly with the external air. In the latter case the gases are partially chilled and driven unconsumed through the flues, while the strength of the draft through the grate is proportionably diminished. In my improvement of the intimate mixture of the numerous small orifices, allow heated aii' with the gases, without impairing the strength of the draft in any appreciable degree.

The tubes may either be added to the existing patterns of cooking stoves or ranges or may be cast in connection with the flues as may be most convenient.

that I claim as my invention and desire to secure by Letters Patent of the United States is The hollow center piece 79 when connected with the hot air tube t, and constructed in the manner and for the purposes set forth.

Intestimony whereof I have signed my name to this specification before two subscribing witnesses.

JAMES SPEAR.

Witnesses:

JAMES M. MGDONNELL, WILLIAM THOMPSON.

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