US169655A - Improvement in grate-bars - Google Patents

Description

2 Sheets-Sheet 1.

' T. MURPHY. GRATE-BAR.

'Patented Nov.

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T. MURPHY. @RATE-BAR.

\ N. PEIERS. PHOTO-LITHDGQAPHER, WASHINGTON. D C.

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THOMAS y MURPHY, OF DRrRorr, MICHIGAN.

y IMPROVEMENT IN GRATE-RARS.

Speeieation forming part of Letters Patent No. 169,655, dated November 9,1875; application filed April 17, 1875. f

To all whom 'it may concern Be it known that I, THOMAS MURPHY, ot' Detroit,l in the county of Wayne and State of Michigan, have invented an Improvement in Furnace-Grates, of which the following is a specification Y My invention has for its object to provide the furnace of a steam-boiler-heating furnace or stove with a grate which will permit a greater volume of air to pass into and through the superimposed incandescent fuel, and thereby enable all kinds of coal, but more especially slake and refuse coals, to be successfully burned; also, to so arrange the grate-bars as that every second one may be vibrated to free the grate from ashes, and to collect the clinkers and refuse at certain points where they can be removed or ground up, and then removed by toothed cylinders rotated by cranks on the outside of the furnace.

Figure 1, Sheet l, is a perspective view of the furnace of a marine boiler, nearly all the front of the same being broken away to show my improved grates applied thereto. Fig. 2, Sheet 2, is a cross-section of the grates, their supports, and the operative parts. (Seen in Fig. l.) Fig. 3 is a perspective view of one of the grate-supportingframes. Fig. 4 is a similar view of a toothed cylinder used for grinding clinkers and removing ashes. Fig. 5 is a similar View of a feathered rock-shaft for vibrating the grate-bars. Fig. 6 is a detached perspective view of a triangular stationary grate-frame. Fig. 7 is a similar view of an intermediate triangular vibrating grate-frame. Fig. 8 is a similar view of one of the stationary inclined bars, such as are erected at the sides ofthe furnace. Fig. 9 is a similar View of an intermediate vibrating bar.

In thedrawin g, A represents a pair ofparallel bars, east with girths connecting them at the ends and intermediately, making aframe which can be supported longitudinally in a furnace by bars or brackets on the front and back walls thereof. ln the furnace shown three of these frames are employed but in a narrower one two,

.or but one alone, may be necessary. The girths of each frame are hollowed on the upper edge to receive and support a toothed cylinder, B, whose front end extends through a thimble in the front leg of the furnace, or beneath the front ries of bars set up at an angle of about forty-five degrees, as circumstances may require, against the furn ace sides, supported at the lower` ends by the outer edge of the frame A,tl1e lowerM ends of the bars being notched to projectover 'the 4edge of said frame. There is a pendent "lugat the lower end of each bar D, with a pearshaped opening in it. There is also an enlargement of the upper end on one side, to form a spacer, through which a hole, f, is cored in cast-- ings D is a bar of nearly the same shape, having apivOt-lug, f', on its upper end to insert in the hole j' of the bar D. Between each pair of said bars it is intermediately placed. Instead of the open lug at the lower end, it has a segment-shapedlug with a notch, c', in its upper side, in which the rib cof a rock-shaft, C, enters. The front end of the rock-shaft extends either through a thimble in the front leg of the furnace, or through the draft-Open ing; and, when oscillated by a crank, the feather c of the rock-shaft engages with the notches of all the bars D', and vibrates them, freeing the grates of ashes, and carrying the partially-consumed coal and the clinkers to the lower ends of the grate-bars, and upon the toothed cylinders B. E is one of a series of triangular grate-frames, havin ga notch at each end to engage with the side bar of a frame, A, it being placed between two contiguous frames A, on whichit rests. The bottom piece or girth of each frame E is hollowed out to form a bearing for the rock-shaft C, whose front end, like the Others, projects through a thimble in the boiler-front, or into the draft-opening. E is a similar fram c, but without the notches at the ends,

and is intermediately placed between pairs of the frames E, its ends resting upon the frames A. lts girth has a socket, t', in the lower edge, which receives the rib of the rock-shaft, which,

when oscillated on its axis, vibrates all the frames E( in the series laterally to and fro, freeing that part'of the iire-bed from ashes, and throwing the unconsumed coal down toward thefoot, and the clinkers upon the cylinders B, which grind and remove them when rotated.

. Fresh fuel is thrown on the tops of the gratei'raniesand tops ofpthe inclinedv bars at the sids'of the furnace', and there remains until coked and partially consumed, until the time for tiring the furnace the next time, when the incandescent coke may be pushed offby the fire-hoe, or by vibratingf'the grates Fresh fuel being then introduced and thrown upon the incandescent mass, Will have its gases ignited and consumed while cokin`g,owing to the free admixture ot'large volumes of atmospher-- 4 ic airfatl a veryT high temperature.

In afurnacev of less Width than that shown one set of the-triangular grates may be omitted 5 as also the intermediate toothed cylinder 5 and in a very narrow or contracted furnace i the'said. triangular grat'es maybe omitted altogether, using `only the inclined grates at the sides,V and an intermediate 'clinker-grinding cylinder. 1 A It is evident that these grates may be modied.' in arrangement to suit the requirements Y of various forms of air-heating and other stoves andfurnaces. Withoutdeparting from the spirit ofmyinvention.

i' lWhat Ij claim as my invention, andfdesire to secure byLetters Patent, is-A The combination of two sets ofalternat.` ing and inclined bars, D D, with a support-` ing bars D D', substantially as described and shown.

3. The combination, with the frames A, of the triangular grateframes E E', in an alternating series, the said frames E being susceptible of a lateral vibration from the rockshaft C, hung in the frames E, substantially as and for the purpose set forth.

4. In a furnace or fire-box, the combination of'tWo sets of transverse grate-bars, inclined from the sides of the-re-box toward each irnos. MURPHY.

' Witnesses:

' H. F. EBERTS, C. E. HUEsTIs.

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