US147670A - Improvement in grate-bars for furnaces - Google Patents

Description

E. MALLON.

Grate-Bars for urnaces.

Patented Feb. i7, i874.

I ivriED STATES PATENT OFFICE.

RDwARD MALLoN, or NRW roRK, N. Y.

lMPROVEVIENT IN GRAT-BARS FOR FURNACES.

Specication forming part of Letters Patent No. llio, dated February 17, 1874; application filed J annary` 26, 1874.

To all whom it may concern:

Be it known that I, EDWARD MALLON, of the city and county of New York, in the State of N ew York, have invented certain new and useful Improvements in Grate-Bars for Furnaces, of which the following is a specification: e

My invention relates to grate-bars in which each bar is supported upon the other without intermediate bearers; and the invention which is the subject of this patent consists ot' dovetail openings, formed through the grate-bars,

for the twofold purpose of receiving dovetail projections from the adjacent bars and forming air-openings for the grate 5 also, ofthe receiving doveta-il openings having enlarged entering portions for the heads ofthe dovetail projections, and lower socket-seats for the shanks thereof, whereby, in placing the bars side by side, their enlarged heads are inserted through the openings and their shanks drop down into narrow socket-seats to support the bars, and hold them in place and prevent them from warping or twisting; and of the spacing-lugs, combined with, and forming backs to, the reeeiving dovetail openings of the bars to give strength to the bars at these openings, thereby utilizing the ordinary lugs, which form the spaces between the bars for the two. additional purposes and advantages stated.

In the accompanying drawings, Figure l represents a view, in perspective, of several of the grate-bars locked together by dovetailing devices; Fig. 2, a similar view of the opposite side of one of the bars; Fig. 3, a crosssection of several of the bars taken through `.the lugs and dovetailing locking devices; and Fig. 4, a horizontal section of the same.

rlhe bars are cast in the usual manner, with vertical lugs a on one side, running from the top to the bottom, for giving the required air and raking spaces to the grate. These lugs, in addition to this function, serve as the bases upon which to cast dovetail projections b, standing out from the face of each lug a, and with their shoulders c either beveled or parallel to the side of the bar. In the dn wings I have shown these dovetails b as having a projection equal to the thickness of the bars, (but they may be less, if desired,) and they are sufficiently strong to support the bar.

In each bar, directly opposite the lugs, dovetail open-` ings d are formed to receive the dovetail projections b, and to lock them therein. For this purpose the upper portion e ot' the openings d are enlarged7 so as to form an outline' like the letter T, in which the lower portion f is to receive and hold the shank g of the lug dovetail. while the enlargement is to admit of the entrance of the dovetail-head h, to allow the shank g to be passed into and seated upon the socketseat t' of the open dovetail, in which positions the neck j' of the socket-seats dovetail with the shoulders c of the lug projections, and this matching, while supporting one bar upon the other, locks them all laterally, so that they cannot spread by warping or twisting, and also prevents their moving endwise out of place. There is sufficient play, however, between the dovetail shanks g and the dovetail necks j" to allow each bar to have an endwise movement to compensate for the expansion of the bars, and to admit of their easy connection in laying the grate. The receiving dovetails d although made in the body of the bars are prevented from weakening them by the lugs a., which, crossing these openings d vertically, form backs 7c thereto, and strengthen the bars at these points, and render the openings d ot' advantage as ventilators to the grate. By this invention it is only required to have lugs on one side of the grate-bar, and these lugs are integral with the supporting dovetails. Short lugs Z are also cast upon the same side near the ends of the bars. The supporting dovetailing devices are, of course, arranged at such distances apart according to the length of the grate-bars. Then the bars are laid together they cannot be separated, except by lifting each bar separately to disen gage the dovetail from its receiving socket-seat and then drawin git away sidewise; and, in'setting them, the projecting dovetails are inserted in place on the plain side of each bar, so that the head ot' each dovetail will join the back of each lug as each bar is putin place. The finishing end bar has lugs on both sides and no dovetails, so that it can be readily inserted in place between the bars and the furnace-wall, as shown in Fig. 3.

Then the grate is laid no single bar but the last one can be removed; and all the bars are supported so that neither can fall out or be pulled apart. They can only be separated by raising eaeh Separate grate-bar to bring the head of the dovetail b opposite the enlarged part Ot' the receiving. dovetail. The grate is set and supported at its end upon the wall in the usual manner.

In settin g the bars,the dovetails are entered laterally, and Jtheir Shanks dropped into the dovetails or socket-seats, and each bar ear-ries its entering and receiving dovetail devices7 und in these respects is complete in itself.

I claiml. rlhe dOvet-ail openin d, formed through shown.

L. The receiving dovetails @having enlarged entering portions a and lower sOeket-seatsf for the dovetails b, as and for the purpose described.

3. The spacing-lugs a, combined with7 and forming backs k to, the receiving' dovetails I) to give strength to the bar at this point, as described.

The above speeieation of my improvement in grate-bars for furnaces signed this 19th day Of J anuary, A. D. 1ST-1.

EDWARD MALLON.

Witnesses:

A. E. H. JOHNSON, J'. W. l-IAMIL'JJON J OHNSON.

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