US276616A - Grate - Google Patents

Description

(No Model.) 2 Sheets-Sheet 1. G. B. MERSHON.

GRATE.

Patented May 1, 1883.

i gi;

. naces, ranges, stoves, &c., of different construc- UNITED STATES PATENT Farce.

GEORGE B. MERSHON, OF PHILADELPHIA, PENNSYLVANIA,

GRATE.

SPECIFICATION forming part of Letters Patent No. 276,616, dated May 1, 1883.

Application filed July 28,1682. (No model.)

To all whom it may concern:

Be it known that I, GEORGE E. MERSHON, a citizen of the United States, residing at Philadelphia, in the county of Philadelphia and State of Pennsylvania, have invented certain new and useful Improvements in Grates, of which the following is a specification.

My invention relates to that class of grates and grate-bars described in Letters Patent granted to me August 1, 1876, July 10, 1877, and March 11, 1879; and it consists in certain improvements, fully described hereinafter, whereby theeflicienoy of the grate is increased, its manipulation and adjustment of the bars facilitated, and the appliances for operating the bars are protected.

In the drawings, Figure 1 is a plan view,

showing the grate-plate and grate and operating devices of a furnace having a cylindrical fire pot; Fig. 2, the same with the grate-bars removed. Fig. 3is a front elevation, showing the front plate and bar-operating appliances Fig. 4, the same with the parts in different position; Fig. 5, a view showing the shape of the front cover or bea ringplate; Fig. 6, a lon gitudinal section of-the grate on the line 1 2,3 Fig. I. Fig. 7 is an enlarged plan of 'one of the grate-bars. Fig.8 is a view illustrating a prior construction. Fig. 9 is a perspective view of a cover-ring; Fig. 10, a perspective view of a range, showing a box or shield to protect the operating appliances, with a part ofthe box broken away 5 and Fig. 11 is a modi-i fication showing another form of shield. Some of the improvements which I will describe are adapted to furnaces having rectangular fire-pots; but I have illustrated them in the drawings in connection with the circular grate, as the, latter embodies specific features of improvement not applicable to grates of a difi'erent construction.

VA is the front plate; B, the bed-plate or grate-plate; and G and D are the usual doors covering the fuel and ash-pit openings. These parts may be constructed differently, according as the improved grate is applied to furtions.

The plate B is formed with a series of sockets, a, at the back, adapted to receive the rear journals, a,of the grate-bars E,and with other j, which are connected by a cross-bar, e, as

shown in Fig. 3, a"lever,C, serving to rock all the spindles in the manner fully set forth in the Letters Patent granted to me March 11, 1879.

The spindles (7, instead of being detachable from the bars, may be connected to or cast with and form part of the latter, and the armsfmny be cast with the spindles. To hold the spindles d securely in position while they are rocked, and yet. permit their ready removal in order to detach a grate-bar or reverse its position when it is warped, I make the support of said spindles detachable. Thus the plate A may have a longitudinal recess, or, opposite the ends of the grate-b'ars,and aplate, A, may be adapted to said recessand provided at the upper edge with sockets t', shaped to receive and constitute the bearings of the spindles d, which are held in place and support the bars in a horizontal position when the plate A covers the opening an, as shown in Fig. 6. On removing the plate A the spindles will drop to the positions shown in Fig. 4, dotted lines, and may be withdrawn, so that the respective bars can be detached. The longitudinal movements of the spindles when the plate is in place may be prevented by thickening the plate, as shown in dotted lines c, Fig. 6, so as to fit between collars h h on the spindles, or by forming annular grooves in the latter adapted'to receive the edge of the plate; but I prefer to form a groove, m, at the under side of the bed-plate B, adapted to receive the collars h when the bars are horizontal, thus preventing any endwise play. When the spindles or journalsare lowered, as shown in Fig. 4t, the collars are dropped from the groove, so that the spindles may be withdrawn.

The plate Amay be held in place by means of buttons lor other suitable devices,which buttons are pivoted at the upper ends, so as not to shake loose when the furnace is agitated in raking. The plate may be constructed in different ways; or, insteadof the plate, a bar arranged back of the plate .A and hinged at one end, so as 'to be dropped to release the ICO ' or dropping bar, I sometimes construct the front plate, A, of a furnace, Figs. 3, 4, and 6, with an opening, an, above'the end of the bedplate B, which opening I cover with a plate, N, having a flange at its lower edge to drop into a groove in the top of the bed-plate B, near its outer end, and this plate N is secured and held in position at the top by two or more buttons,a. By removing the plate N ready access can be had to the, interior of the firepot or to the bolts that hold the sections of the plates together.

It is desirable sometimes to reverse the gratebars should they rise or sink or become warped by heat; but this cannot be done in constructions heretofore adopted with circular grates-for instance, that illustrated in Fig. 8, where, owing to the curved form of the openingin the bed-plate, it is necessary to cut off the end lugs of the bar at the side opposite the edge of the bed-plate, so that the bars can be rocked; but the contact of the lugs or teeth a and the plate B prevents the bars being rotated sufficiently to reverse them. To obviate this objection I make each bar only of such length as will serve to support an equal number of lugs upon the opposite sides, and then extend parts of the bed-plate B inward on opposite sides, as shown in Figs. 1 and 2, forming offsets or steps 8, which are recessed to form the journal sockets, and from these offsets project lips t, filling the spaces which would otherwise be left vacant, and taking the place of the teeth removed from the bars, so that there can be no loss by the slipping of unburned coal into the ash-pit. To further prevent such a result, I form upon the sides of the plate B lugs n, which extend between the teeth ofthe opposite bars to co-operate with the latter to sustain the bed of coal and to crush the cinders when the bars are rocked.

The sockets are open at the top, and are cov-- cred by a frame or'ring, I, which is detachable, and may be flanged, as shown, to form in conjunction with a flange, w, on the plate B a groove for the cylinder to set in. The plate or ring I is constructed to rest on the bed-plate B, but so far above the journals of the bars that said journals can tilt upward when the outer ends of the bars are lowered. ()n the under side of the ring, above the sockets a, are I short lugs a beveled as shown, so as to keep the journals in the sockets, yet permit them to tilt upward when the front ends of the bars are lowered.

The bars as heretofore constructed have had side lugs or teeth, at, of substantially uniform width or thickness, so that in case of shrink age of the bars, or of longitudinal displace-b merely covment thereof, the teeth of one bar would sometimes be brought over those of the next, causing the two to strike, limiting the rotary movement and interfering with the raking of the fire. To prevent this I curve the teeth at each side the bottom, or preferably toward the top and bottom, leaving them thickest in the middle, as shown in Figs. 6 and 7, so that if the tooth of one bar is brought over that of another the contact of the inclined sides will thrust the bars longitudinally as they are rotated, preventing any locking of the bars, and restoring them thus to their places.

It is desirable in many cases to prevent too extended a movement of the bars. I secure this result by making the armsfof such width and proportions that they will come in contact, as shown in dotted lines, Fig. 3, before the teeth of one bar can pass above or beyond those of another to any great extent, the bars being thus held in their proper relative positions, while the power of the lever is prevented from coming upon any one bar.

The exposure of the front cranks and connecting-bar is sometimes objectionable, as in furnaces particles of coal drop between the cranks and face-plate and interfere with the operation of the raker, and in ranges, portable stoves, &c., the same result ensues, while the exposure of the cranks detracts from the artistic finish of the article. To prevent this I boxin the cranks and contiguous parts by a box, J, open at the under side, (shown in dotted lines, Fig. 6, as applied to a furnace, and in-Fig. 10 as combined with a range, and in Fig. 11 as applied to a cylinder-stove,) this box covering the said parts and preventing their obstruction or exposure.

The arm or lever C", or rod for operating the grate-bars, is extended through a slotin the box, either as shown in full lines or as in dotted lines, both in Fig. 10, or otherwise. It will be apparent that this cover for the baroperating appliances may be employed in grates, stoves, ranges, furnaces, and wherever such appliances are used.

I do not claim the projecting box covering the operating devices.

I claim- 1. The bed-plate provided with a series of sockets, a b, combined with detachable bars having journals turning in said sockets, and with a detachable flanged covering ring or frame, I, substantially as set forth.

2. The combination of the bed-plate, socketed as set forth, and having a flange, w, the

detachable bars, a ndthe flanged frame I, substantially as set forth.

3. The combination of the bedplate and the dumping-bars and the frame I, secured to the bed-plate, as described, so as to leave a space above the journals of the bars, for the purpose set forth.

4'. The frame I, with its lugs, combined with the socketed bed-plate, as and for the purpose specified.

5. The combination of the front plate, A,

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IIO

having an opening, a:, a detachable plate fitted thereto, and grate-bars having journals supported by a movable bearing, substantially as set forth.

6. The combination of the bed-plate, gratebars provided with journals, and a movable hearing, A, for the journals at one end, substantially as specified. y

7. The combination, with the dumping grate bars, of journals detachable from the bars and a movable bearing for said journals, as specified.

8. The combinationof the grate-bars, the journals having collars h, and the plate B,

having a groove adapted to receive the coloffsets being socketed to receive the journals of the parallel rocking bars, substantially as set forth.

11. The combination, in a grate, of rocking bars provided with fiat upper and lower faces,

side teeth beveled at the sides toward the top and bottom, as set forth, whereby the bars will be moved longitudinally when the beveled sides are brought in contact, as specified.

12. The combination, with the rocking gratebars provided with side lugs, of operatingappliances constructed to rock the bars, but to limit the movements thereof, as specified,

whereby the lugs of one bar are prevented.

from rising beyond oraway from those of the adjacent bar, asset forth.

, In testimony whereot'I have signed my name to this specification in thepresence of two subscribing witnesses.

' GEORGE E. MERSHON,

Witnesses:

GEO. F. MUNcE, CHARLES E. HENRY;

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