US8758A - Air-heating- furnace - Google Patents

Description

2 2 Sheets-Sheet I.

E. D. NORCROSS.

Hot-Air Furna ce.

Patented" Feb. 24, 1852.

2 Sheets-Sheet 2, D. NORCROSS.

} Hot-Air Furnace.

N0. 8,758. Patented Feb. 24 1852.

UNITED STATES PATENT OFFICE.

n. D. NoRoRoss, or AUGUSTA, MAINE.

Ara-HEATING FURNACE.

Specification of Letters Patent No. 8,758, dated February 24, 1852.

To all whom it may concern: M

Be it known that I, EDMUND D. Nononoss, of Augusta, in the county of Kennebec and State of Maine, have invented a new and useful Hot-Air Furnace for Heating Buildings, &c., and that the following is a full, clear, andexact description of the principle or character which distinguishes it from all other things before known and of the usual manner of making, modifying, and using the same.

The nature of my invention consists in the construction and attachment of the door frame, the constructive arrangement of the fire plate, and the construction of the furnace, to adapt it thereto, and the mode of admitting the cold airto be heated, in combination with the peculiar manner of caus- .ing the products of combustion, heat, &c.,

to be revolved, so as to obtain the greatest amount of heat in a cheap, durable, and

simple manner. t

Figure 1 1s a perspectlve View of the furnace set up preparatory to being inclosed in the brick Walls. Fig. 2 is a perspective view of the door frame of the furnace. Fig. 3 aremovable fire-plates which come in contact with the fuel, and protect the sides. of the furnace from injury by heat. Fig. t is a view of the rearplate of the furnace, showing a portion of the brickwork. Fig. 6 is a vertical longitudinal sec tion of the furnace. Fig. 7 is asection of the surrounding brick work, in the same plane as Fig. 6. Fig. 8 is a ground plan of the brick work ofthefurnace.

The construction is as follows: The cross section of the furnace is ovate, the smaller end being downward. The advantages of this form are,first, contracting the furnace at the point where the fuel lies, and enlarging at the same time the body of the furnace where the air is heated, and the gases are revolved prior to their exit. Secondly, the facility which it gives, by means of its inclined sides, for the removal of the fire plates (to be hereafter described) and retaining the regular curved figure, as shown in the drawings.

The longitudinal section of this portion of plate has a projecting flanch (D) perpendicular to its surface, extending backward the breadth of eight inches, more or less,

(See Fig. 1 A.) The back and of similar outline to a cross section of the furnace without the bottom. There are circular apertures (B) in the front and back plates, with pipes extending from one to the other (see Fig. 6) and opening to the spaces, front and back of the furnace. The air is supplied from the exterior atmosphere through the brick wall below, and passes up into the pipes above named through the air chamber formed by the flanch D. The smoke pipe (0) opens from the front plate over the fire door, and may extend up and back over the furnace, as shown in Fig. l, or in any other convenient way; the opening into which the door frame is fixed in the front plate is somewhat higher than the frame itself; and upon the upper and lower side of the door frame are fianches (e), which, when the door frame is put in place, hook on to the front plate, above and below. The upper fianchshould be about double the depth of the lower ones. It is first inserted, and the frame pressed upward till the lower one enters, when it is pressed down to its place, and remains firmly affixed in its place.

The fire plates above named, shown in Fig. 3, are constructed and applied as fol lows: I place in the bottom of the body of the furnace, inside, two curved bars (00), which I denominate dogs. These fit the curvature of the bottom, and extend some distance up the sides. They are recessed at either end on their outsides, so as to leave a space between them and the side of the furnace sufiicient to slip in three or more plates (y) on each side, to form a lining to protect the furnace which can be removed without disturbing the other parts. On these plates are small projections (a), which pass down on each side of the dogs, to steady them, and hold them in place. The furnace is elevated and supported on four legs, and the parts are held together by rods (w) passing from the front to the back plate. The brick work is. built up so as to form a chamber around the furnace, as in other structures of thiskind, that portion of this air chamber, at the back, being divided from the rest, above the bottom, by the flanch D above described. The air for combustion enters the fire-door, and causes a circulation of the heated gases within, by

first driving them backward and upward, circulating around the air tubes above, whence they pass forward and make then exit through the smoke pipe in front. This is very important, especially Where air pipes are thus used, as it causes the most perfect diffusion and extraction of the heat, Which would not be the case if the smoke pipe opened through the back plate into the furnace.

Having thus fully described my improvement, What I clalm therein, and for Which I desire to secure Letters Patent, is

1. Arranging the fire plates, in the manner set forth, so as to render them movable, in combination With the inclined sides of the furnace.

2. I also claim the combination of the air pipes passing through the furnace With the rear fianch D; and With the arrangement for revolving the gases Within the furnace backward and upward, thence passing them olf in front, as described, the cold air being brought to the outside of that part of the furnace and tubes, against Which the heat first impinges, thus protecting it, and rendering the parts more durable, and more equally distributing the heat.

EDMUND n. NoRcRo ss.

Witnesses BECKWITH WEST, I. A. SMITH.

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