USRE11126E - Furnace-grate - Google Patents

Description

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s mh.; E vm O Kw ME U A Mm HU ..nr. M u d 0 M 0 m No. 11,126. Reissued Nov. 18, 1890.

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` M- H. MOSKOVITS,

FURNAGB GRATE. NQ. 11,126.

`Reissu'ed Nov. 18,1890.

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UNITED STATES PATENT OFFICIEL MAXIMILIAN H; MosKovI'rs, oF'KANsAs CITY, MIssoURI.VV

" 1 Fu RANA'cE-e RATE.

ysracnucnrroiv forming par; of aeissued Letters Patent No. 11,126, Ndvmber 18, 1890. original No. 399,683, ma umh 19, 1389. Applications reime mediaan' 24,1890. .sain 11. 345,156.

To alZ whom it may concern:

Beit known that I, MAXIMILIAN H. MosKo- VITS, a citizen of the United States, residing at Kansas City, in the conntyof Jackson and State of Missouri, have invented certain new and useful Improvements in Furnace-Grates, of which the following is afnll, clear, and exact description, reference being had to the acccompanying drawings, forinin ga part of' this specification.

My invention relates to furnaces havingautomatic feed-ing and cleaning devices; and it consists in the novel construction and combination of parts, which will be first `fully described, andspecifically pointed ontin the claims.

In the drawings, which illustrate the manner of carrying ont. nl y invention, Figure l is a broken sectional sidev elevation of my improved furnace-grate as applied to a steam boiler furnace with horizontal boiler. Fig. 2 is a front elevation of saine,'looking beneath thegrate-bars,with thefnrnace-doorsremoved. Fig. 3 is a detail view of one of the'gnidebearing rollers or balls. l Fig. 4 is a .detail plan view of the under side portion of one of the reciprocating grate-bars. Fig. 5 is a detail cross-sectional view in perspective ofthe upper end ,portion of one of the grate-bars, the cross-section beingtaken upon line'y `y, Fig. 4. Fig. Gis adetail view of the hand-leverand connections for varying the inclination of the grate-bars. Fig. 7 is a .detail view of the multiform cranklshaft used for communicating motion to the grate-bars. Fig. 8 is a view in perspective of an end portion of the bearing bar which su pportsy the ends of the grate-bars. Fig. 9 isa detail longitudinal sectional View of the upper end portion of one' of the grate-bars broken away near the forked bearing-lug, also showing the upper end portion of one of the respective su pportin g-posts for the transverse grate-bar support, and the crank-supporting brackets, showing the transverse bar in section, the end portion of the crankshaft and the roller-bearing sockets and roller.

The fu mace-front may be of the usual form, with lthe exception of ordinary feeding and ash-pit doors, which are entirely abandoned, that part ofthe ordinary furnace-front below the lower boiler-line being entirely removed,

preferably so that the bottom of the gratebars and ofthe interior of the furnace below the grates are perfectly exposed to view from aposition in front of the boiler. 'If so desired, however, I may close the front of the furnace below the grate-bars and abovethe Hoor-line z by means of doors.H of any ordinary form.

Each side of vthe furnace below the gratebars cbnsists of a heavy solid cast-iron frameplate A, extending from the front to about;v the inner'ends of the grate-bars, and from the" front ends of which frame-plateA extend the Vertical posts A2 A2, which posts support the cast-iron front carryingv the feed-hopper C.

From the said frame-plates A A near the rear end portion of said plates extend upwardly and rearwardly the curved arms A3 A", and upon the end of each arm' directly abovel the rear end of said plates -A A is attached a thi-mble a,.for the purpose hereinafter described. Said side frames or plates A A are bound together by means of a horizontalv bearing-bar E, which extends across from one plate. A to the other, and upon which the lower end portion of theseries of gratebars D are mounted. Said frames or plates A A are made very-heavy and supportall the other work independently of the brick-setting, and one preferablymounted upon snit'- able wheels or rollersv a and removably 1ocated in an ash-p`it A', as shown more clearly in Fig. 1. Said pit not-only extends under the boiler a sufficient distance to form an ordinary ash-pit, but it extends a sucient distance in front of the boiler to allow the entire frame A (supporting the feeding apparatus) to be withdrawn from under the boiler whenever occasion may require.

The pit A isprovided with a suitable cover d, which may be quickly removed whenever required, in such instances as ldrawing the fire or cleaning out ashes. Y

In front of the boiler and-above the upper ends of grate-bars D D a large iron hopperC is attached to the cast-iron front extending across the front, its lengthbeing eqnalto the width of the grate-surface and its'capacity varying-accordingly. The bottom of the hopper C is formed by the upper ends of gratebars 1), which extend outwardly a sncient distance for such purpose. The grate-bars roo y of fuel in use.

D are inclined at about an angle of thirtyfour degrees from a horizontal line, and this position of the bars may be'varied from a direct horizontal position to any angle of in'-- c'lination thereto `corresponding to the kind Each grate-bar D is provided with depending-longitudinal portions or sides 'y y, which are cast integral therewith and extend on both sides the entire length of the grate-bar. Said bars D are made with short longitudinalbearing-ribs c, projecting from the under side of their lower ends, which rest within an encircling groove f,for|ned on the outside of said bearing rollers orballs F. The bearing-edge e2 of the ribs e are in a plane parallel to that of the upper surface of the bearing-bar E, and also describes nearly an' acute angle to the plane of the under surface of said bars D, so that as the saidA bars are reciprocated upon theirsupports the deviation in the lines of the roller-bearings in the sockets h, receiving the rollers or balls F, will cause the lower ends of the grate-bars to rise and fall as the rollers or balls move along the inelined elongations of said sockets. Said balls or rollers are located in elongated sockets h, formed in the transverse bearing-bars E. Said sockets are provided with an opening or slit .z' in the bottom for egress of dirt and grit,

which might otherwise collect in them and cause friction to be generated.

The upper ends of the grate--bars are ful- .erumed upon the transverse bar I, the ends of which bar 'are rigidly attached tothe respective posts A2 A2. Said upper ends of the grate-bars areprovided upon their under'surface between the flanges 'y y with elongated ball-sockets e similar to those in bars E, and they rest upon suitable friction balls 0r roll ers F, located in said bearing-bar I, as here-A inafter described. Upon the said grate-bear ing bar I are rigidly attached a series of lugs t3, which extend a short Y'distance in an upf ward direction from the upper surface of said bar between the anges y 'y of the grate-bars D and elevate said bars' suicientlyvto prevent the iianges y y from frictional contact with said bar Il rllhe upper surface of the lugs s are inclined at an angle corresponding to theinclination of the grate-bars heretofore described, and in said inclined upper surface of -said lugs 3 are .made the elongated bearing-soekets e3. vSaid grate-bars are constructed with a solid upper end b, provided with steps or eorrugations b uponV its upper side and with a fire-surface upon its lower portion, whichris preferably made up of short trans verse zigzag webs 10. however, be constructed in any other preferred form that will answer the purpose. It will be observed that the steps b are continued over the entire upper surface ofthe grate-bars.

The transverse zigzag webs 10 are located at sufficient distance from each other to afford Y ample inclined openings into the burning fuel, insuring full supply of air, and not only pro- 'lhe fire-surface may,

meting combustion, but also keeping the 'grate-bars comparatively cool and preventing them from being warped,'u1elted, or burned out.

Y .On the inner plate c of the feed-hopper C,

I locate a vertically-sliding feed-plate. 13, which can be moved up and down by means of a suitable screw and hand wheel 14, or by any other preferred means, so as to close the feed-opening 12 more vor less.

The roller-bearings in thesockets h in bar E at lower ends of grate-bars are rearwardly inclined, (see Fig. 1,) so that as said bars are alternately reciprocated longitudinally an alternate rising-and-falling movement will be imparted to their lower ends, thereby causing them to be oscillated upon the upper bearingbar. This rising-and-falling movement of the vibrating ends may, however, be aecomplishedA in changing the position of the upper surface of the grate-bearing bar E to that described by the inclined grate-bars in the same angle of inclination, or nearly so, in which position the longitudinal ribs upon the grate-bars will cause the rollers to travel in the elongated sockets and the ends of the grate-bars to rise and fall in a less degree than heretofore described.

' Each grate-'bar making up the grate has a rising-and-falling and endwise movement imparted to it by means of the multiform crankshaft H, having a number of short cranks 16 formed on it which engage a suitable forked bearing-lug 17," depending from the under surface of grate-bars D near their upper ends.

The cran k-shaft His supported at both ends h h, and said ends aord a bearing in the upperends of the brackets h' h', each one of which brackets is attached at its lower end to the outer side portion of the respective jposts'A2 in the` plates A A, and said upper yends of said brackets are bent outwardly from-said posts and extended upwardly in line with the lugs 17 on the under surface of ithe barsD.

Each alternate bar D is moved in the same direction by means of the several cranks on said shaft II. The lower ends of the bars D move up and down; but their upper ends rest and oscillate upon the upper bearing-bar F, and therefore do not follow the circular and up-and-down movement of cranks 16. A continuous rotary motion is imparted to this crankfshaft-by'means of a worm-gear 18 and belt19-onother suitable gearing. (Shown at 'the righthand side of Fig. 2. The motion is such that one-half of the series of 'bars as thus arranged lift the body of the fuel from the bars between them (which are moving in an opposite direction) and cause said fuel to move evenly down toward the rear of the furnace. The movement of the fuel is still further aided by the steps formed on the up# per side of the grate-bars, said steps imparting a movement to the feed and pushing it toward the rear of the furnace. The movement is positive and uniform and maybe va- IOO IIO

ried as occasion requires. The fuel entering the furnace by way of the feed-opening 12 is delivered at the top of the grate-bars, where the motion of the grate-bars, combined with gravity, causes it 'to move evenly along the Y grate-bars toward the -rear of the inclined furnace.

All fuel on the grate-bars moves simultaneously and continuously.- This movement'is positive and uniform, although it may be accelerated or retarded,- as the demand for steam through passage 50, formed in the brick-work at the lower end of said bars,

to the ash-pit below, as shown in Fig. 1.

The feeding motion may be varied in varions ways-' for instance, by changing the speed of the driving-gearing or byvimparting a different degree of inclination to the grate-bars, which latter I accomplish as follows:

The bearingfbars E at lower end of gratebar are provided with vertical shanks 60,which fit within the thimbles aon the curved arms 4A3 A3 of the frames A A, and`whichshanks have friction-wheels 61 at their lower ends. rlhese `frictionfwheels rest upon cams 62, mounted upon transverse shaft 63. Said shaft 63 is journaled at each end in the lower and rear end portion of the respective plates A A directlybeneath the thimbles a on the arms A3 A3. By means of a hand-lever 64, which extends upwardly and -outwardly a suitable distance to be conveniently reached, the shaft 63 may be slightly revolved in its bearings, causing the cam 62 to raise or lower the shank and bearing-bar E, carrying the lower ends of the grate-bars, thus givingmore or less inclination to said grate-bars and causing the fuel to travel downward upon them faster or slower, and'in greater or less quantity, as the demand for steam requires.

The power required to drive the entire apparatus will be but atrifling amount, because the bars are entirely supported on balls F.

The machine may be driven by a belt from any convenient shaft, or a small special en` gine may be used forthis purpose, as may be preferred by the proprietor of the 55- plant. l Having fully described my invention, what I now claim as new, and desire to secure byf 1. In a furnace having sideandash-retaim,

'inthe other direction, having rollers bearing upon the upper side of said transverse support, and also having yelongated sockets for said rollers and rearwardly-inclined bearings for said rollers in said sockets, substantially as and for the purpose described.

2. In a furnace having side and ash-retaining Walls, the combination, with said walls having transverse anti-friction grate-bearing supports, of a grate consistingof a series of alternatelyreciprocating grate-'bars having longitudinal ribs upon their respective under surfaces and fulcrumed in the direction of 4one :end upon one of the lsaid anti-friction supports, and the other support-for the other ends of said. bars provided with elongated sockets having rearwardly-inclined bearings and rollers in said sockets, having peripheral grooves adapted to receivethe ribs upon said grate-bars, substantially as described.

3. In a furnace having side and ash-retaining walls, the combination, with said walls having transverse anti-friction supports in the upper and lower portions of said side walls, of a grate consistingof a series of alter# `nately-recprocating grate-bars fulcrumed in the direction of their upper ends/ upon the upper transverse support andinclined at an and having longitudinal ribs upon the under surface of the respective grate-bars, and the bearing-,edge'of said ribs in a plane'at an angle toand in the direction of said ashwall,

angle to the plane of the under surface of said l bars, and the lowersupport for the lower ends of said barsprovided with elongated sockets` having rearwardly -inclined roller bearings,

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and rollers in said sockets having vperipheral j grooves adapted to receive the bearing-edge portions of the ribs o n said grate-bars, substantially 'as described.-

4. In a furnace, the combinatiomwith the side walls having anupper transverse grate`v bearingsupport provided with raisedlugs and elongated sockets in theupper surface of said lugs, of a grate consisting of a series of alternately reciprocating grate-bars having 'side flanges, and their upper ends fulcrumed upon said' guides and each bar provided at said bearing-point with elongated sockets upon its under surface between ,said side flanges and the bearing ends of each one of said bars provided with longitudinal ribs upon its under surface, and the bearing-edge of said ribs in a described plane at an angle to the plane of the under surface of said lgrate-bars, and a lower transverse support for the lower end of said bars provided with elongated sockets and rearwardly-.i nclined roller bearings in 'said f sockets and rollers in saidsockets, eachroller` having a peripheral groove adapted to receive f said grat-ethe bearing-edge ofthe ribs on bars, substantially as and forthe purpose described.

5. The combination,in a furnace, of a grate having'inclined grate-bars provided with suitable bearing-sockets near each end, friction'- balls located in lthese sockets, atransverse bearing-bar provided-.with depending shanks supporting the lower ends of said grate-bars,

cams in the path of the lower end portion of webs which are disposed transversely, the npsaid Shanks to raise and lower the same,and per surface of said bar being stepped or corxo a hand-lever for rotating said cams, substanrugated, substantially as described. -tially as and for the purpose described. 5 6. Theimproved grate-bar constructed solid MAXIMILIAN H' MOSKOVI l 5' for a considerable portion ot its length and Witnesses: with the remaining portion of its length in the WARREN VATSON, form of a fire-surface composed of short zigzag A. UTTER.

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