USRE2573E - Improvement in grate-bars - Google Patents

Description

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.uiten gisten stent @frn LORENZO B. TUPPER, or New YORK, N.; Y., AssieNEEA or DANIEL'LAsneR.

Letters Patent No. 29,997, dated-i5'eptember 11, 1860; reissue No. 2,573, dated- Apm'l 23, 186.7.

IMPROVEMENT IN entre-Blas.

To 'ALL WHOM rr' MAa'CONOERN: f

Be it 'known that; ,'NEL LASHER, of Brooklyn, in the county of'Kn'gS, and State of New York, did invent, make, and apply -to-Inse, a certain new and` useful' Improvement 'in Grate-Bars for Furnaces; and the following is declared tobe afull, clean-and exact description of the construction andv operation of the same, reference being had to'the annexed drawing, making part Of this specification, wherein Figure 1 is a. plan of' two ofthe said grate-bars. l l

Figure 2 isal sideelevation of one of said grate-bars; and

Figure 3 is a side elevation Of the other.

Similar marks of reference denote the same parts.

l Grate-bars have usully been fitted to run longitudinally of the furnace, in order that the scraper used for drawing out or stirring'ythe tire may pass over the same and not drop into the openings between the bars.

These grate-bars do not allow as much air space as desired for almost all furnaces, and not only obstruct the draugbtvbu't are -very heavy, and warp and twist under the heat. Grate-bars have also beenmade with a longitudinal bar., having separate cross-bars projecting above such bar; but with these a scraper could not be used for stirring'4 the re Ordrawing it out, because it would fall in between the cross-bars. i

.The nature of this invention consists in a. furnace grate-bar, with a series of pa-rallelogram openings running crosswise ofthe ber Or4 support, whereby a much larger air space is obtained than in the ordinary gratel bars, and nt the same timethe surface is such that the scraper or stirrer* will not catchtherein, and the weight of the grate-bar isgreatly reduced without lessening the strength.

In the drawing, ais a metallic b'ar, supported by cross-bars at the ends, as now usual. bis a. series of parallelogratns, running transversely of the bar a, the same being formed by bars across th'e bar'a, connected at their ends. The alternate conuectionshown prevents injury by expansion and contraction. The bar 'a may stop at tbe'undei side of the cross-bars b, forming the parnllelograrn Openings all across the bar, as seen in fig.

3, or the same may rise up to the same level as the cross-bars, as seen in iig. 2, and at c c in tlg. 1. In this latter instance the parallelogram openings are shorter, and thegrate-bar is rather heavier, and does not'atford quite se much air space, but thesurface'of the bar a will also support the scraper. The bars are kept apart by lugs dal Or interlocking projectionaso that there lare `air spaces between the bars and the parallelogram openings transversely of the bar, and the grate-bar overhan ging ut its upper part, allows the bars a. a to be much further apart than now usual, each of the bars being equal in widtht'e two o'r three of those before used. The scraper slides freely over the surface produced by the grote-bars, because l,the length ofl transverse openings is less than the width of thesorapers Or stirrers e'niplbyed for this purpose, and the surface of the bar a and the connections between. the ends of the cross-bars support the same. The' bars a a. are kept as cold as possible, and hence are more durable', and thegre is freed from ashes more easily, because most of the openings are at right angles to the motion of the scrapers,land thelongitudinal openings between the. bars allow the lire to be raked from below. 4 v

What is'claimed, and `to be secured by Letters Patent, is-a 1. A furnace grate-bar, having a. series of parallelogram openings running crosswise of the bar, substantial-ly as set forth.

' 2.- A furnacegrate-bar, in which the cross-bars are alternately connected at their ends, substantially as set forth, to strengthen said cross-bars and prevent the scraper droppingin between said bars, as set forth.

3. A furnace grate-bar, in which the surface of the longitudinal bar is on the same level as the top'of the cross-bars, as set forth, 4so that said longitudinal bar willeid in supporting the scraper.

4. lFurnace grate-bars, in whichthere are longitudinal 'air spaces between the bars, and parallelogram air spaces'transversely of' the bars, substantially as setvfrth.

:Dated this twentieth day of March, A. 1867.

LORENZO B. TUPPER. Witnesses:

- A.Gnome D. WALKER.

OnAsH. SMITH.

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