US22518A - Franklin stove - Google Patents

Description

D. STUART.

A Stove.

No. 22,518 Patented Jany 4, 1859.

hara/555.55,

' heat to a great extent.

UNITED STATES PATENT OFFICE.

DAVID STUART, OF PHILADELPHIA, PENNSYLVANIA.

FRANKLIN STOVE.

Specification of Letters Patent No. 22,518, dated January 4:, 1859.

To all whom it may concern:

Be it known that I, DAVID STUART, of Philadelphia, in the county of Philadelphia and State of Pennsylvania, have invented an Improvement in Franklin Stoves, and that the following is a full, clear, and exact description of the principle or character which distinguishes it from all other things before known and of t-he usual manner of making, modifying, and using the same, reference being had to the accompanying drawings, of which- Figure l is a vertical middle section from back to front of the stove showing the air chamber A entire. Fig. 2 is a plan of the front and main portion of chamber A and Fig. 3 is a plan of the back portion of said chamber.

Hy invention consists in an improvement in Franklin stoves described and represented as follows:

In the construction of Franklin stoves in the usual way the plate forming the lire back is generally warped, cracked or destroyed long before other plates of the stove are injured by the heat of the fire. There is also a great amount of heat lost in consequence of the non conducting space between the lire back and the back plate of the stove. These two defects I have remedied by the introduction of the air heating chamber A in such manner that while it forms the fire back, it preserves the same from excessive heat and utilizes what was before waste This chamber is formed by casting, in two parts C and D; the part C forming the main port-ion of the walls of the chamber and the part D forming the back plate or wall of the chamber and fitting closely withinthe raised edges or flanges around C. On plate C are cast projecting ledges B the ofce of which is to cause the air which passes through the chamber to be distributed throughout the same these ledges extending from plate C to plate D. On the upper part of the chamber is a pipe E which passes through the top plate of the stove, and near the lower part of the chamber is a pipe F which admits the cool air of the room into the chamber. When the stove is put up the air chamber is let down and supported upon the ledges K, the pipe F passing out through an aperture in the back plate of the stove and the pipe E passing through the top plate. The escape pipe P is so situated that the draft passes over a portion of the back of the chamber A and thereby contributes to equalize the distribution of heat and at the same time increase the heating capacity of the chamber. The constant current of air over the plate forming the fire back prevents its warping, cracking or burning out, and the heat absorbed therefrom and imparted to the air from this and the back wall of the chamber is all utilized.I

I do not claim forming an air space or chamber in which air circulates behind or in contact with the fire backs of stoves and passes thence in a heated condition into the apartment as that has long been known and used, but

W'hat I do claim as my improvement in Franklin stoves is- Forming the fire back of such Stoves by the front wall of a cell or chamber around or on both sides of which the draft passes and through which the air circulates as set forth said cell or chamber being constructed and connected with the stove in the manner set forth.

DAVID STUART.

lVitnesses P. MAGEE, A. I-I. PERKINPINE.

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