US1231325A - Mechanical stoker. - Google Patents

Description

N1 %TE% ATENT FFTQEQ JOSHUA BATTEER, F PHILADELPHIA, PENNSYLVANIA, ASfiIGNOR T0 OSCAR BARNETT FOUNDRY COMPANY, A. CORPORATION" OF NEW JERSEY.

MECHANICAL STOKER.

Specification of Letters Patent.

Patented June 26, 1917.

Application filed. October 4, 1913. Serial No. 793,279.

To all whom it may concern:

Be it known that I, JOSHUA BATTEER, a citizen of the United States, and a resident of Philadelphia, in the county of Philadelphia and State of Pennsylvania, have invented certain Improvements in Mechanical Stokers, of which the following is a specification.

The objects of this invention are to pro I vide in a mechanical stoker improved means for preventing rip-passage of air at the inner or rear end of the traveling grate and yet permitting the discharge of ashes and clinkers rearward over'saidmeans; to secure greater efliciency by thus preventing such up-passage of air where there is no combustion; to obtain such improved means which will not burn out or be melted by the heat; to restrict movement of said means away from the grate in operation of the stocker, so that it will neither admit air or burn; to secure such means which will serve as a scraper to clean the grate bars as they pass beneath; to provide for these purposes the bridge bar described herein, and to obtain other advantages and results as may be brought out in the following description.

Referring to the accompanying drawings, in which like numerals of reference indicate the same parts throughout the several views,

Figure 1 is a longitudinal sectional view of a stoker embodying my invention;

Fig. 2 is a perspective view of a bridge bar showing'its front and top, and

Fig. 3 is a perspective view of the bridge bar from the front turned bottom up.

In the specific embodiment of the invention illustrated in said drawings, 1 indicates one of a pair of opposite parallel housings adapted to project from the front plate of a furnace (not shown) and extend upward from the floor. The front shaft 2 of the traveling grate is mounted in said housings, and the grate extends horizontally rearward therefrom over a rear shaft 3 journaled in bearings a supported by upper rails 5 which extend from said housings and preferably continue beyond said rear shaft to the bridge wall of the furnace (not shown). These rails 5 are preferably of channel iron arranged each with its flanges directed inward toward the other, and said rails are suitably secured to the housings and bridge wall as well as supported by intermediate uprights 6. Beneath the upper rails 5 are lower rails 7 preferably of angle iron,

The traveling grate I have shown comprlses endless chains at its opposite lateral edges between which extend the transverse grate bars 8, as is common in the art, and the said chains run over propelling or sprocketwheels upon the front shaft 2, and over large peddler wheels 10 on the rear shaft 3 which are simply grooved at their peripheries to receive the chains. Intermediate of the front and rear shafts 2 and 3 rods 9 extend between the uppe side rails 5, and upon these rods 9 are loosely mounted peripherally grooved peddler wheels 11 which are smaller than the said peddler wheels 10 upon the rear shaft so as to lie between the upper and lower reaches of the chain grates and support the upper reach.

Between the rear or inner end portions of the upper side rails 5 and in substantially the same horizontal plane therewith is arranged the dump plate frame 12, extending from the bridge wall forward nearly to the traveling grate and closely fitted at its rear and end edges to the said bridge wall and the side walls of the furnace so as to prevent lip-passage of air or draft. This dump-plate frame 12 is bolted to the side rails 5 or otherwise suitably supported, and in it is hingedly mounted the dump-plate 13. This dump plate is preferably hinged along its rear edge to the under part of the frame 12 and closes upward against the under side of the frame, as shown, by any suitable operating means. For purposes of illustration, I have shown an inverted U-shaped member 14 pivoted at the ends of its arms upon the uprights 6 and provided at its top with a roller 15 adapted to wedgingly force the dump-plate closed as the member is swung forward and to allow it to open when swung rearward, such swinging being effected by a connecting rod 16 extending forward through the ash pit to a crank 17 in one of the housings 1 and adapted to receive outside the same a lever 18.

The bridge bar 19 in which the present invention more particularly inheres, extends forwardly from the dump-plate frame 12 and overlies the end of the traveling grate, being preferably disposed above or at the upper side of said parts. This bridge bar is shown as extending from side to side of the stoker, normally resting at its ends upon the upper side rails 5, and with its front edge adjacent the grate surface. The top of the bridge bar preferably slopes up wardly rearward, as at 20, so that ashes will bank against the front edge of the bridge bar and protect the same, and said top is preferably socketed as at 21 or otherwise suitably formed to receive fire brick 22 or the like. The rear edge of the bridge bar is shown upright or nearly vertical and projecting considerably above the clump-plate frame 12, so that the ashes have quite a drop to the dump-plate as they are pushed over the bridge bar.

In these drawings I have shown the front edge of the dump-plate frame providing at its upper part a rib 23 and at the front side of the base of said rib a horizontal flange 24. The bridge bar itself has in its bottom and near its rear edge a longitudinal groove or recess adapted to receive the said rib 23, as shown in Fig. 1. Preferably, this rib does not fit so tightly in the groove but that a slight rocking motion of the bridge bar is possible, such for instance, as would allow its front edge to move up and down an inch, more or less. The bridge bar I have shown made in a single casting cut away at its bottom, to save metal, and leaving transverse ribs or braces 25 which preferably alternate in position with the partitions 26 between the fire brick recesses at the top of the bridge bar. It will be understood, however, that the bridge bar may be otherwise manufactured as may suggest itself to anyone skilled in the art, and I do not wish to be understood as restricting myself herein except as set forth in the following claims when construed in the light of the prior art.

In operation, the bridge bar not only arrests at its front edge the ashes and elinkers being carried rearward by the traveling grate, so as to force the same upward over the bridge bar and so to the dump-plate, after burying the bridge bar so that it will not be burned out, but said bridge bar also at its front edge acts as a scraper to clean the grate bars of any clinkers adhering thereto. Such cleaning is effected by a grinding and pulverizing of the clinkers between the grate bars and the front edge of the bridge bar, so that when thus pulverized they fall down through the interstices of the grate into the ash pit. Furthermore, it will be noted that by the use of my invention no space or opening is provided for draft or the up-passage of air back of the traveling grate itself.

Having thus described the invention, what adapted to travel at its upper end in a substantial plane, of a bridge bar extending the width of said grate at the rear end thereof and pivotally supported at its rear edge with its forward edge resting at the ends upon said side rails and providing between said ends a space between the bridge bar and grate, whereby the bridge bar is free to rise and act by gravity upon clinkers forced beneath it and its weight at other times is taken by the side rails 2. In a stoker, the combination with side rails and a grate between said side rails adapted to travel at its upper end in a substantial plane, of a bridge bar extending the width of said grate at the rear end thereof and pivotally supported at its rear edge with its forward edge resting at the ends upon said side rails and recessed upwardly between said ends to form a space between the bridge bar and grate, whereby the bridge bar is free to rise and act by gravity upon clinker-s forced beneath it and its weight at other times is taken by the side rails.

3. In a stoker, the combination with an endless grate, of a bridge bar extending the width of said grate impervious to the passage of air and having a longitudinal series of pockets or recesses at its upper and lower surfaces separated by transverse upper and lower partitions alternating or staggered with respect to each other, whereby the metal is distributed and radiation of heat facilitated. I

4. In a stoker, the combination with an endless grate and a dump plate frame at the rear end thereof providing at its side next the grate an upwardly projecting rib, of a bridge member adapted to extend at its forward edge over the grate and chambered or recessed at its under side with transverse partitions cut away at their rear ends to receive said rib of the dump plate frame and pivotally support the bridge member thereon.

5. In a stoker, the combination with an endless grate and a dump plate frame at the rear end thereof providing at its side next the grate an upwardly projecting rib with a lateral flange projecting forwardly therefrom at a distance below its upper edge, of a bridge member adapted to extend at its forward edge over the grate and chambered or recessed at its under side with transverse partitions cut away at their rear ends to receive said rib of the dump plate frame I and rest upon the said lateral flange thereof.

JOSHUA BATTEER. Witnesses:

ERNEST E. 'PREVOST, J OSEPH H. TAULAND.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

' Washington, D. G. i

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