US97347A - peters - Google Patents

Description

21 Shem-Sheet 1. BOYD & HART.

Hot-Air Furnace.

No. 97,347. Patented Nov. 3 0, 1869.

0 gym M We 2 Sheets-Sheet 2.

BOYD & HART.

Hot-A ir Furnace.

-Patented Nov. 30, 1869.

Tm 07 03-07 RM wwqni gww Q M w Km a W Z i dined swa ROBERT BOYD AND JAMES OJHA RT, OF ROCHESTER, NEW YORK.

Letters Patent No. 97 ,347 dated Not-ember 30, .1869.

HOT-AIR FURNACE.

The Schedule referred to in these Letters Patent and making part of the same.

ing it through fines passing down on each side of the entrance-way to the ash-pit into an air-chamber extending entirely under the furnace, and thence directly into a hot-air space, completely surrounding and enclosing the sides of the ash-pit, from whence it is distributed under the fire by means of a series of apertures pierced in the inner wall of the ash-pit immediately under the grate-bars. The object of this part of our invention is to heat the current of air feed ing the fire, and our devices for the purpose are improvements upon devices heretofore in use.

The improvements consist, mainly, in so constructing, arranging, and disposing the air-fines and spaces as that said tines and spaces shall cover and include the entire exterior radiating-surtace ot the ash-pit,

instead of a part thereof, whereby the air becomes more fully heated than where it passes over a portion only of said surface.

The second part of our invention relates to the formation of a series ot'serrat-ures upon the edges of the draught-apertures in the dampers of a stove or furnace. The object of this part of our invention being to obtain a more perfect control over the admission of air through the draught-openings, and the nicest possible adjustment thereof.

Figure 1, of the accompanying drawings, is an elevation of the front of our improved furnace, illustrating the position of the damper-doors;

Figure 2, a side elevation of the base thereof, (including the ash-pit and grate,) with a portion of the outer casing broken away, to illustrate the direction of the draught therein;

Figure 3, a horizontal section of the base in the line a: x of fig. 2;

Figure 4, a horizontal section in the line y y of fig.

2, with a portion of the floor of the ash-pit broken away, to illustrate the course of the draught through the air-space beneath;

Figure 5, a vertical transverse section in the line .7 z of fig. 3; and

Figure 6, a detached view of our improved serrated graduating damper.

A is the ash-pit of the furnace.

B, the grate.

O, the walls.

D, the door of the ash-pit, and

1'), the entrance-way into the same.

F, an outer casing, so encircling the wall of the ashpit, and of the entrance-way E thereto, as to form and enclose an air-space or chamber, G, about the same.

H, an air-space or chamber formed under the ashpit and the entrance-way thereto, by an'extension oi the outer casing F below the level of the ash-pit floor.

K K, partitions, forming flue-spaces G G, on each Side of the entrance-way E to the ash-pit A, by sepa} rating said spaces from the chamber G encircling the ash-pit.

L, the door of the ash-pit.

M M, dampers or dranght-d'iors opening directly into the spaces G G, partitioned ofl' from the encircling air-chamber G.

N, a flue placed on top of the entrance-way into the ash-pit, and extending from side to side thereof, corn-j municating with a front damper or draught door, P.

Apcrtnres s s, figs. 2 and 3, are pierced at each end of this flue 1, opening into the spaces G G.

Apertures t t, figs. 2 and 4, are also pierced in the bottom of the spacesG' G, which, opening directly into the air-chamber H, extending under the ash-pit, convert said spaces into air-fines.

\Vings or curved partitionplates, 0 U, fig. 4, are inserted between the. bottom of the ash-pit and the floor of the air-chamber beneath, converging toward the centre from lateral points coincident with the juncture of the entrance-way E and ash-pit A, as illustrated in fig. 4 of the drawings.

These wings serve to throw the currents of air entering the chamber or air-space N, through the open-. ings at t i toward the centre thereof.

Free communication is established between the airchambcrs H and G, by means in a continuous series of openings, W W, figs. 4 and 5, of the bottom of the encircling chamber G, conmmnicating directly with the airspace Hbelow.

The dampers or draught-doors are constructed with one of the edges of each draught-opeuing' serrated, substantially as illustrated in the drawings, figs. 1 and- 6. Either the edge of the stationary plates through which the drauglit-opcnings are pierced are serrated, as illustrated, or these are left straight and unbroken, and the damper-doors covering said openings are serrated, the required ninety of adjustment in the draught-openinghcing sin' ilarly obtained in either case.

The operation of our improved furnace is as follows:

After a fire has been properly kindled upon the grate B, the door D, leading into the ash-pit, is closed to prevent a passage of air through the ash-pit, and make it, in fact, comparatively air-tight, and one or more of the damper-doors P and M M, over and on each side of the ash-pit door, are opened to admit the necessary supply of air to support combustion.

The currents of air entering through the upper draught-door P, pass to the right and left, through the flue N, and down through the apertures s s at each end thereof, into the side fines G G. From its peculiar position, and its proximity to the fire-box of the 4 the ash-pit itself,) deriving heat therefrom, and thenes'eapes through the openings W W W into the chamber G, surrounding the ash-pit,where it becomes still more highly heated, and is then discharged in its heated state imn'iediately under thegrate-bars to sustain the combustion of the fuel thereon.

By thus conveying the draught of air for the furnace under and around the entire exterior surface of the ash-pit, all the heat radiating therefrom, and otherwise lost, is utilized in heating said draught and obtaining aconsequent economy in the consumption of fuel in the furnace.

The side doors M M may be dispensed .with and the upperdraught P alone be used, or where it is not convenient to introduce an upper flue, N, the side dampers M M will suffice. By providing each draughtopening with serrated graduating dampers M and P, we are enabled to regulate the admission of air through the openings with a nicety hitherto unattained in stoves and furnaces, and we contemplate the application of these dampers to all manner-of draught-open-, ings where the supply of air requires close adjustment.

We do not claim heating the air to support combustion in the furnace, nor do we claim passing the draught for. this'furnace through an enclosed space underthe ash-pit.

Ve claim, as our invention- 1. A draught-opening and flue N, arranged over the entrance-wayto the ash-pit of the furnace, and communicating with lines G G formed on either side of H, extending under the bottom of the ash-pit, and a flue-chamber G completely surrounding the same, and from whence the heated draught is discharged under the grate-bars of the furnace, all substantially in the manner herein set'forth.

directly with said side flues G, and combined with substantially as herein described.

of the ash-pit A, when combined with the air-space H below, and provided with a series of suitable inletapertures W W below, and discharge-vents above, substantially as hereiudescribed.

4. A graduated damper having the edges of one or more of the plates, (either stationary or movable,) controlling the admission of air, serrated, substantially as herein described. 7

The foregoing specification signed by us, this 15th day of October, 1869.

ROBT. BOYD.

J AS. '0. HART.

, Witnesses:

HENRY H. Mouse, OHAs. W. Tnocrrnn.

said entrance-way, in combination with an air-space 2. The side draught-openings M M, communicating the said lower air-space H, and encircling chamber G,

3. The chamber G, completely enclosing the sides I

Images