US177857A - Improvement in hot-air furnaces - Google Patents

Description

-UNITED STATES PATENT 'oi-Fica WILLIAMII. Lofrz, OF CHICAGO, ILLINOIS.

4IMPracviawnaur IN Hor-Am FuRNAcEs.

Specification forming p art of Letters Patent No. 177,S5`7,.dated May 23,1876; application `filed July 9, 187,5.

August 11, 1874;and on October 27 1874, for

animprovement thereon; and has for its ob- Ject to secure a more perfect combustion of the gases, through the means more fully7 hereinafter set forth and claimed.

Figure' 1, Sheet l, isv a perspective view of my improved portable furnace. Fig. 2 is a vertical section at a: m. Fig. 3, Sheet 2, is a horizontal section at y y in Fig. 2. Fig. 4 is a similar section at z z in the same figure.

In the drawing, A represents the ash-pit, having a circular opening in its top plate, in which is hung a grate, B. A lire-pot, C, rests upon the ash-pit, and incloses the grate-opening. The back part of the fire-pot is higher than the front, and is covered by a fiat plate, a, whose shape is that of an irregular segment, in front of which there is a combustionchamber, G', into the lower front part of which `is carried an inclined fuel-chute, D, whose lower wall forms a prolongation of the front of the fire-pot. The upper end of the chute extends through the casing J, and is provided with a fuel-door. Between the inner edgeof the platea and the back wall of the combustion-ch amber there isa pendent hollow bridgevwall, b, extending transversely across the combustion-chamber, with'a narrow slit, c, along its lower edge for the delivery of air, which is carried to it by a bent pipe, d,ex

l tending up the back and over the top of the combustion-chamber, and through the casin g, the volume of air admitted being regulated by a register, c. From the plate athree iiues, E, rise into a horizontal hue-chamber, F, connected at the front by a passage, F', with an outer annular flue-chamber, G, at one side of which there is an exit-flue, K, carried out through the casing to a smoke-pipe, K'. G' is a segmental Hue-chamber, which nearly surrounds the ash-pit. rlhe annular flue G is divided into two parts by a partition, j', at the back. Access is had to the front part bya door, at one side of which is a revertible draftdamper, g, which closes the said 'fine to the passage of theV gases of combustion to the exit-flue, in which case they are compelled to pass into the left side of said flue G, thence down into the segment G', through six dropl fines, H; thence up through six ascending lines, H', to the right side of the flue G before finding an exit therefrom. Access is had to the flue G' through doors and passages through the casing, to remove accumulations of dust deposited therein. I is an annular evaporating-pan, supported by short legs :above the annular flue G. J is the casing of the furnace, and K2 are the hot-air flues issuing from its top.

The fuel-chute is inclined at the angle at which coal will fall from a pile, and serves as a magazine, in which the fuel is coked and caused to yield up its gases, which naturally rise and expand into the large combustionchamber C', at the top of which there is a register, h, for admitting atmospheric air to mingle with them in the proper proportion to prepare them for ignition. The draft of the furnace is at the back part ofthe fire-pot, owing to the lesser depth of coal there, and the mixed air and gases are drawn back runder the bridge-wall, where a thin stream of highlyheated air niingles with them at the proper temperature to ignite them, the ignition being secured by their passing over the incandescent fuel, in close proximity to its upper surface, so that clear flame alone will be found back of the bridge-wall, proof of which is found in the fact that 'bituminous coals 'of the poorest quality have been continuously consumed in such furnaces without giving off smoke.

What I claim as my invention is- 1. In an air-heating furnace, and in combination, the hollow bridge-wall across the back part of the fire-pot, and within the same, and having a narrow slit across'its lower end, and an air-tube, having a register at its outer end, said tube passing over and behind the combustion-chamber, and its inner end terminating directly over the slit aforesaid, substantially as and for the purposes set forth.

2. In an air-heating furnace, the combination of the following elements, viz :l a fire-pot, havingan elevated combustion-chamber di rectly above and connected with it, and closed at the top; al1 inclined magazine-chute, adapted to deliver fuel to the front of the fire-pot; a hollow transverse bridge-wall, adapted to deliver a thin stream of hot air into the fire-pot back of the inner mouth of the magazinechute; a tube with a register for admitting hot air to the gases of combustion before passing under the' bridge-Wall; and ues at the back of the repotfor carrying off the products of combustion, substantially Vas described.

3. In an airheating furnace, the combination of the annular flue G, having the partition f and revertible damper g, the segmentl ue G', the diving and ascending ues H H', and the iues E, F, and F', and the fire-pot G, substantially as and for the purposes set forth.

4. In an air-heating furnace, in combination, the pendent bridge- Wall within the tire-pot v and across the same, the combustion-chamber,

and the eduction-ii'ues, for the. purpose of interposing said bridge-wall and the current of hot air passing through it between the opening into the combustion chamber and the opening into rthe eduction-iues, substantiallyl as described and shown.

' WILLIAM El. LOTZ.

Witnesses GEO. FROMMANN, CARL MEYER.

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