US527448A

US527448A - Traveling-grate furnace

Info

Publication number: US527448A
Authority: US
Publication date: 1894-10-16
Anticipated expiration: 1911-10-16

Description

` 2 sheets-sheet 1.

S.. D R A H O I R E L m `o u m TRAVELING GRATE FURNAGE.

Patented 001;. 16, 1894.

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FRANCIS l-I. RICHARDS, OF HARTFORD, CONNECTICUT, ASSIGNOR TO ECKLEY B. COXE, OF DRIFTON, PENNSYLVANIA TRAVELlNG-G RATE FU RNACE.

SPECIFICATION forming part of LettersPatent No. 527,448, dated October 16, 1894. "Application filed November 27, 1893. Serial No. 492.053. (No model.)

This invention relates to fuel-traveling;

ro grate mechanism for furnaces, the l objectof the invention being to furnish in connection with a furnace, an eliicient non-rotary fueltraveling grate adapted for carrying the fuel in a layer along in the furnace after the manner of the endless traveling grate, or chaingrate, heretofore used forthat purpose.

.In `the drawings accompanying and forming a part of this specification, Figure l is a sectional side elevation of afurnaceembodyzo ing my `present improvements. Fig. 2 is a sectional plan Viewof the furnace showing the arrangement of the grate-bars and gratebar-actuating mechanism. Fig. 3 is a transverse sectional elevation of the furnace taken 2 5 in line aa, Fig. 1 showing the parts at the right hand of said line as seen from a point at the left hand thereof. Fig. 4 is a detail view illustrating, in sectional side elevation,

a portion of the right hand end of the furnace 3o showing thegrateand actuating mechanism in a position differing somewhat `from that shown in Fig. 1, said ligure being intended to y illustrate the operation of the devices for imparting therequired traveling movement to 3 5 the grate-bars. Fig. 5 is a cross-sectional detail View, on an enlarged scale, illustrating .the preferred form and arrangement of the grate-bars.` e e A Similar characters designate like) parts in 4o all the figures. e i, t

The furnace illustrated `in the drawings has the usual inclosing Walls at the sides and ends thereof and is shown provided with an i ordinary furnace roof. The side-Walls are designated by 3` and` l, respectively the roof by 2, the usual bridge-wall by 5, and the front wall by 6. At the forwardend of the furnace this is provided with the fuel-supply hopper H e. from which the -fuel is admitted toM the fur-` e `5c nace-chamber throughthe inclined chuteor opening '7, in a welll known manner,

l The furnace is provided with a reciprocatory fuel-traveling grate, designated in a general way by G, which grate is supported at itsends by suitable transverse supports, on, having suitable guides m for guiding the movements `ofsaid grate. `Airis supplied to the fuel upon the grate frombelow in any suitable man` ner.` In practice, suitable grate-bar-supporting rollers, as 9 and10will be provided at one 6o or` morepoints in thelength of the grate-bars for reducing the friction of the bars as they are moved longitudinally of the furnace.

My improved fuel-traveling grate consists of a series of grate-bars supported as before `6 5 described and adapted to have arelatively slow forward movement together, and to have separately, or successively, a relatively rapid backward movement.` The series of bars is carried forward with a relatively slow movezo ment toward the left hand in Fig. l by means of suitable actuating devices,.as hereinafter described, and during said forward movement of the majority of the series, the bars are, aportion of them ,at a time, retracted with a relatively rapid movement to their original positions.` During this retractive movement, the fuel resting in almass spread in a layer upon the series of bars has a greater resistance upon the several adjacent for- 8o wardly-moving barsthan it has adhesion upon a backwardly-moving single bar. I Therefore the layer or mass of fuel remains, in practice, t unbroken by the retraction of one bar at a time so long as one or more bars on each side 8 5 of the retracting bar continue to move for- 1 ward together. y By means `of this organiza- .v tion of mechanism the layer L of fuel resting on the bars is carried regularly forward, after the same manner, substantially, as by 9o the ordinary endless traveling grate.` In practice,the proper operation of the mechanism will be facilitated by setting the grate somewhat inclined downwardly toward the rearward end thereof, as` indicated in the drawings, so that gravity will co-operate with the forwardly-.moving bars to preventretraci. tion of the fuel by the backwardly-moving e bars. t

In the preferred form thereof herein shown, roo

the grate mechanism `consists ofthe altere nate upper and

lower bars

12 and 13,

- positions, and beso ktimed-.in theirmovements which bars are shown substantially of the same construction set side by side with the exception that the so-called upper bars have each a cap-piece, 14, while the lower bars 13 have the supporting plates 15 underlying the edges of the cap-pieces of the upper bars 12. This arrangement is, shown bestin Fig. 5 where the fuel is shown supported on said bars as in practice, the air being supplied to the fuel from below through the openings or air-spaces 16 and 1'7, which'openings are prevented from clogging by the arrangementv of the overlapping plates and caps 14. and 15, respectively.

As a means for imparting the, requisite movement to the grate-bars, I have provided in connection with each grate-bar a grate-bardriver, or cam, 19, which in the form thereof herein. shown, (see Fig. 4.-) consists of awheel having a relatively. long or eccentric camface, 2,5, by means of which a relatively slow forwardmovement is imparted to they gratebar, and a relatively short return-camface, 26, by. means of which a relatively` rapid return-movement is imparted to thegrate-bar, which cam-facesmaybe formed by grooving theface of the driver` or in any well known manner known tothe art.

The, grate-bars 12 and A13 are shown provided with rollersorstuds, 18, for engaging thecam-faces25and 26 of.I thegrate-bar-actuating.- cams, or drivers, the drivers being herein. shown as grooved to form` said: camfaces. These` cams, orl drivers, arefshown placed upon a shaft, 20, that is carriedl in bearings in the walls of the furnace. Said shaft is shown provided 'at one end with the worm-wheel. 2l fixed thereon, which wormwheel meshes with the worm 22 on thedriving-shaft 23 supported inA suitable bearings and provided with a driving pulley 2*4.l whereby the entire mechanism may be actuated. As before stated the forward movementof l thegrate-bars is produced by thegradual incline or cam-face 25 of the driver, while ther backward movement thereof is produced'- by thesteeper or shorter cam-face 26. In Fig. 4 thedriver is illustratedin a dierent--position from that shown in Fig. l'for more fully settingforth the operation of the mechanism', which will-be readily understoodby comparison ofthe several figures-of the drawings` in connection withv this` description thereof.v

In practice, the grate-bar-drivers will be secured to the shaft 20'in slightly varying as-to moveforward the majority ofA` the bars all together with a relatively'slowmovement and will: move others ofi said bars backward with a relatively rapid movement, vwhich arrangement will befnlly understood by anyfollows: The grate-actuating devices being r started in operation by operatively connecting the pulley 24 with some suitable source of power, (as for instance, a suitable motor connected by a belt, not shown) said devices actuate the several grate bars after the manner herein'oefore set forth and impart to them av general and relatively slow forward movement of substantially uniform velocity throughout the forward stroke thereof and impart to apart of them at a time successiveA and relatively rapid backward movements. i The fuel beingsuppl-ied to the grate from the jhopper through the chu-te or opening 7, is carried forward on the grate in acontinuous layer, air being supplied to the fuel from below in any suitable'manner to facilitate combustion thereof, after-*which the ash and cinder are discharged over the rear end of the a grate-bars. f I claim- 1. A fuel-traveling grateforfurnacesoni sisting of a series of grate-bars supported for longitudinal movement, combined withl ro- 1 tary drivers and connectionssubstantiallyas described for imparting a gradual and relai tively slow` longitudinal forwardmovement to the series of bars, and adaptedfor-i'mparting a relatively rapidbackward movement-to i a portion onlyI of thebars at a time, and: means 'I for rotating said" drivers, substantially asde.- .i scribed and for the purpose set forth.

2. The herein described fueltraveling 1 grate forfurnaces, it consisting ofl a series of lbarssupported'and adapted for longitudinal 'movemen-t, in` combination with bar-actuat- -ing devices which consistof differently dis- Iposed revolubledrivers having successive long and short cam-faces adapted respectivelyfor-imparting a relatively slow forward longitudinal' movement to the majority of the ygrate-bars, and for imparting a relatively -rapid` backward movement to said ba-rs, in 1 dependently or successively, andY connectingdevices between4 the grate-bars and their-- f drivers and in constant bearing-contact with the bearingfacesthereof, substantially as-described and for the purpose set forth.

3. In a furnace, in combination, a series of j positions alongsaid shaft-'whereby a revolution of said actuatorswill impart a general relatively slow advancmg-movement, and y successive relatively rapid lreturn-movement l to said-grate-bars, substantially as described.

IOO

IIO

IZO

4. A fuel-traveling grate for furnaces comprising a vseries of lower grate-bars having fuel-supporting top plates, a series of upper grate-bars having top plates in longitudinal 5 parallelism with and partially overlapping the top plates of the lower grate-bars and so disposed as to leave air-spaces between said plates, substantially as described, combined with rotary drivers and connections for imlo parting a relatively slow and gradual forward movement to theseries of bars and adapted for imparting a relatively rapid backward movement to a portion only of the bars at a time, and means for rotating said drivers, substantially as described and for the pur` I5 pose set forth.

FRANCIS H. RICHARDS. Witnesses:

FRED. J. DOLE, .FREDERICK A. ROLAND.