US172564A - Improvement in stove-grates - Google Patents

Description

T. B. GRIFFITH STOVE-GRATE.

Patented Jan. 25,1876.

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UNITED STATES PATENT QFFICE.

THOMAS B. GRIFFITH, or souTH'oARvE a, MASSACHUSETTS.

IMPROVEMENT IN STOVE-*GRATES.

Specification forming part of Letters Patent No. 172,564, dated January 25, 1876; application filed December a, 1875.

To all whom it may concern:

Be it known that I, THOMAS B. GRIFFITH, of South Oarver, in the county of Plymouth and State of Massachusetts, have invented certain new and useful Improvements in Grates or Fuel-Receivers for Stoves, &c.; and I do hereby declare that the following is a full, clear, and exact description thereof, which will enable others skilled in the art to which it pertains to make and use the same, reference being had to the accompanying drawing, and to the letters of reference marked thereon, which form a part of this specification.

In said drawing, Figure 1 denotes a front elevation, Fig. 2 a horizontal section taken on line 00 a: of Fig. 1, Fig. 3 a longitudinal central and vertical section, and Fig. 4 a transverse central and vertical section, of a Franklin stove provided with a grate or fuel'holder constructed and applied in accordance with my invention.

My improved device is intended for stoves, furnaces, &c., of any desirable form.

The object of my invention is to provide a grate so constructed and applied to a stove as to attain a more perfect and equable combustion of the fuel than by devices of this character as ordinarily constructed; and my invention consists in the peculiar construction of the grate and its application to a stove, as hereinafter described and claimed.

In the said drawing, A denotes the frame of an ordinary Franklin stove. B the grate or fuel-holder, whose area at its top is about one-third larger than at its bottom. The grate to fit this form of stove is of a curved angular form. The end and back portions are made to taper downward, and are formed with a series of vertical ribs or bars, a a, &c., having open spaces between them, while the front curved portion is made with bars b, extending longitudinally and horizontally. Each of the ends and back of the grate is made with an outwardly-projecting flange or plate, 6?, extending around its upper part, such flange impinging closely against the walls of the stove, and resting upon ledges 0 formed thereon, as shown in Figs. 3 and 4, the object of such arrangement being to arrest the currents of air passing up on the external sides of the grate, and cause them to be deflected inward through the openings in the sides of the grate, and into the fuel therein. 0 is the bottom of the grate, the same being provided with journals having their bearings in the lower part of the grate-frame, the same being to enable such part to be tilted in the ordinary manner. Below the flanges d, and on a plane nearly horizontal with the bottom of the grate, are

three flanges or plates, d, affixed to the ends and back walls of the stove, such plates extending inward toward the grate without coming in contact therewith, the object of such plates being to deflect the entering currents of air, and cause them to pass in contact with the grate and under the bottom, as well as against sides thereof.

I would remark that the form of the stove is immaterial, as it may be circular, polygonal, or any other desired shape .in crosssection. In case it should be of a circular or cylindrical form, the grate should be of frustoconic shape, and have a flange, d, extending entirely around its upper edge, to rest on ledges 0, formed on the inner face or walls of the stove-body, and the deflecting-plate d wouldv be extended entirely around the grate.

In front of the opening or chamber under the grate is a guard or fender, D, which is so constructed as to be adjustable, and thereby enable the volume of air to support combustion to be regulated at will.

From the above it will be seen that by my peculiar construction of the grate the air is brought into direct impingemenhon all its sides, and the deflecting-plates are so arranged as to cause all the inflowing currents to pass into and through the fuel, while the inclined arrangement of the gratebars allows the ashes produced by the combustion of the fuel impinging against such bars to fall through the openings between them, and thereby allow the air to come in contact with the unconsumed portion of the fuel, so as better to promote its combustion.

Having described my invention, what lclaim 1s-- In a stove or furnace, the grate or fuel-holder B, formed with open and tapering sides, and with a flange, d, extending outwardly and resting upon ledges a, formed on the inner walls of the stove, in combination with the deflecting plate or plates d, arranged on the said inner walls, as shown and described, and for the purpose set forth.

F. P. HALE, F. (J. HALE.

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