USRE4935E - Improvement in cooking-stoves - Google Patents

Description

J. H. SHEAR. Cooking-Stove.

Reissued June 4,18???n Vif/1. e cees,

y middle plate.

UNITED i STATES PATENT OFFICE.

JACOB H. SHEAB, OF ALBANY, NEW YORK.

IMPROVEMENT lN COOKING-VSTOVVES.

Specication forming part of Letters Patent No. 94,658, dated September 7, 1869; reissue No. 4,935, dated .lune

To whom it may concern:

Be it known that I, JACOB H. SHEAR, of the city and county of Albany and State of New York, have invented a new and useful Improvement in Cooking-Stoves; and I do hereby declare the following to be a full and exact description of said improvement,reference being had to the accompanying drawing and to the letters of reference marked thereon, the same letter always referring to the same part of the` stove.

This improvement is applicable to a stove having ascending and descending fines to carry the products of combustion around the oven, andhas reference to such an organization and arrangement as will tend to modify the per cent. of combustion within the fire-pot within any given time, to any desirable degree; and also to equalize the combustion in every part of the fire-pot, producing a uniform rate of combustion on every part of the grate. The first mentioned object is accomplished by means of a chambered door to the lire-box, in passing through which the air becomes heated before reaching the fuel, and a damper in the base of the exit-flue, to check but not entirely cnt oft' the draught. The second object `is accomplished by introducing the air to the fire-box at each end oil the grate, where the radiation is greatest, and excluding it from the center by means hereinafter described.

Figure 1 in the accompanying drawing is a perspective view of a stove containing my improvements with the door of the fire-box closed. Fig. 2 is a similar view with the door of the fire-box open, and a portion of the top plate broken away to show the internal structure. Fig. 3 is a view of a damper in the lower section of the escape-hue. Fig. 4 is a view of the inner side of the chamb'ered nrebox door, with the inner plate removed to show the middle plate dividing the two chamb'ers; and Fig. 5 is a detached view of said The door of the stove,

compound chambered door, consisting of two chambers, front and rear, connected with each other by means of iiues or openings in the upper sides of the partition separating them, so located in respect to each is a closed space between them,

other as that there as seenl in a a, in Fig. 1, is a Fig. 4, i. The second chamber. is formed by means of a plate, d d, Fig. 5, so attached to the inside of the door as that theopenings into the stove and under the grate shall be at the ends and on the lower side of such chamber, as seen in Fig. 2, d d. The manner in which the air enters these chambers is represented in Fig. 1, at the openings a a. h is a corrugated plate forming the front of the fire-box, below which, in the space g g, the air passes under the grate.

It is to be observed that this compound chambered door is so constructed that the air enters on the lower side and near the ends of rst or front chamber. Thence it arises to the top of the chamber, and enters the second chamber through the openings c c in Fig. 4. It then descends to the bottom of the second or rear chamber and enters the stove through the openings d d, at the points g g, Fig. 2.

E is the lower section of the exit-flue, which I make of cast-iron, and which is, in fact, a part of the stove, the sheet-iron pipe connecting with it at its upper end. In this section a damper, f, with an orifice, jl, in its center is placed for checking but not wholly shutting oi` the draught. The orificej1 should belarge enough to carry off the gases generated by slow combustion when the damper is closed, and to keep up a slight draught. I prefer to make it about one and a quarter inch in diameter for a damper six inches in diameter. A valve, e, may also be placed in the section E below the damper f, to let in some of the outer air; but I do not consider this essential.

It is a well-known fact that a coal fire, (especially anthracite.) may be kept alive with a much less supply of air, if the same be heated, than is requisite for that purpose when cold air is admitted to the fuel; and that the consumption of fuel will be in proportion to the draught. Hence, when cold air is introduced to the fuel the fire cannot be kept alive without draught enough to cause a rapid combustion and speedy consumption of the fuel;

but when heated air only is admitted a slight

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