US1114195A - Grate-bar. - Google Patents

Description

Patented Oct. 20, 1914.

2 SHEBTE-SHEET 1.

T. H. SLY.

GRATE BAR.

APPLICATION FILED DEC. 22, 1913.

IHL' NORRIS PETERS CO" PHOTO-LITHQ, WASHINGTON. D, C.

T. H. SLY.

GRATE BAR.

APPLIGATION FILED 13130.22, 191a.

Patented 001). 20, 1914.

2 SHEETS-SHEET 2.

il l II a combustion and to permit the, evolved gases perforated tops which directlyfsupport the p j I I ever, such prior constructlons have been subfusing onto the main grate bar, rendering e To all whom/ it may mm:

THOMAS HQ-sLY, or nu'mvionn,jrnnnsrnvauih. Q j

GRATE-BAR. l

Be it known that I, THOMAS H'J Snr, a

citizen of the United States, residing": at Dunmore, countyof Lackawanna, and State of Pennsylvania, haveinvented certain new and useful Improvements in Grate-Bars, of

Whichthe following is a specification. I

This invention relates to grate bars, The proper burning of fine fuel under a steam boiler, requires a forced draft furnished by a'fan, turbine orsteam jet blower, which in troduces theair into the ashlpit at a high pressure and the distribution of the a1r through the grate bars into the fuel in order:

to keep the fine fuel a state of uniform toburn. The fewer dead 1 spots where the forced draft does not'strike; the fuel, the i better will be the combustion and the greater the quantity of the heat units. Grate bars have also been subject to warping and burn ing out, despite the provision ofthe 'trussing ribs commonly used inlconnection.therewith. It has heretofore been proposed to provide:

grate bars with supplemental or secondary burning fuel, to the end that warping and burning out of the mainvgrate bar may be minimized and the distribution of, air to the fuel increased. .So'far as I am aware, howject to various defects, among whichmay be'mentioned that the connections or manner of support of the supplemental grate bar sectionshave resulted in distortion and it diflicult and sometimes impossible to remove the supplemental sections when they are burned out or warped and require substitution of others. Another defect whichhas beenincident to earlier constructions has been the imperfect'distribution of the air to the fuel, many dead spots resulting-with consequent loss ofheatand imperfect combustion. a

My invention relatesto that general type of grate bar designed for the burning of fine fuel under forced draft and composed of amaingrate bar havingopenings forthe passage of the air under pressure and supplemental removable sections which are -perforated for; the admission of the air direct tothe fuel. j

In a grate barjof the. foregoing general type, my object is toprovide improvedsupplemental detachablesections mounted'upon,

v Specification of jIi'etters Patent. fPat ent ea oee 2o, 1914.1:

"ApplicationiiIed DecemberQQ,1 913. sei a1N e0s, i93-" icdmieeted to, and icombined withithe will I ggra'te bar in a novelgmanner, whereby they ;may bereadily; assembled or disconnected I i iher f seco d, to] provide thejsup'i- Plfil iental grate bar sections with severalair;

1 siipplying openings and an, improve d arrangement of air distributing grooves or channels and {arranged and combined with the ,inaln grate 'barso' that the eair'o penings are always subject to air supply and -jwhere-' iby the,..air is delivered into the bed of the ,fuel supportedby saidsections in such man inerthat practically nof dead spots? exist Em'the f uejljan d ja morep'erfectcombustion is ieffectedthan hasheretofore been possible.

T Thefinvention' consists of a grate barhav-g ing'ifconstituent parts and features'as also lnovel combinations {of elements, one em bodiment of which"'is set1 forth ,fully hereiinafter," but whichglis; to be; considered as" ,lllllStI'atlVG, rather -t-han restrictive, of the a The mainzgrate bar zsllisiprovided with ;the usual trussing ribs2' andit has'throughiont its top, between said ribs,v numerous air holes or perforationsaid qwhichzcontract 6; andFig. 9, a section on line 9 '9, Fig. 6. i

upwardly andopenhout of thefupper face ofthe grate bar',fsuch contraction resulting in increasing the pressureofthe airllforce'd through theseiopenings. 1,111.: addition to the openings ,lo'catedrbetween the ;ribs 2, the I longitudinal! edges \Of the grate, bar have j semi-openings 4: dwhich, together with cor j responding openings. .on .the" next] adjacent {grate :bar,: provide, complete openings of substantiallythe size and forn iroftheopene ingsLSa The resulting construction is that the only partof thej'gratefbar through which the forced draft does .not'pass the relatively small, narrow area representing the thickness {of theribs Q, WiththiscOna struction, I obtain a greaterffiowiof air than has been possible with those grate j bars which ghave elongated: slots only and no feature similar to the semi-apertures l. At

interva' ls of the longitudinalmedianlinefor axis of the grate bar, there are bolt holes 5 for the passage of the bolts 6 which "con nect the detachable supplemental grate bar sections 7 to the main grate bar 1, in super: posed relation thereto. 1

,The sections 7. are of square form, havtions7 without interfering with the remaining sections, as for instance, when one of said sections 7 is worn out or brok n and another-has to be substitutedtherefor; I do not limit myself to sections 7 of square form, but they are preferably of polygonal form having straight sides Which may be] arranged in contact witheach other at the upper edges 10 and, preferably, the sides ofthe sections 7 are downwardly sloped or beveled to minimize the contacting part at 10 and to prevent fusing aswell as toiprovide for expansion and contraction.

The sections 7 have legs 11 cast integral therewith, said legs resting upon the top of the grate bar 1 and against lugs 12 formed on said grate bar [1, the said lugs preventing lateral displacement of the sec tions 7. The provision of the legs and the lugs causes a centering, or securement of the sections 7 in such fashion that but a single bolt 6,located at the center'of the section, is necessary to properly secure the section to the grate bar 1,- and consequently, but one bolt has to be unfastened to permit removal of a given section or applied to permit securement of a section to the grate bar.

The legs 11 support the sections 7 above the top of the grate bar 1 and there is consequently, a free air space 18 between the main grate bar 1 and the supplemental grate bar formed of the sections 7 which permits a free distribution of the air to the openings or holes 14 in the section 7. The fuel being supportedv by the sections 7, instead of directly on the grate bar 1, the latter is kept cool by the air beneath it and that in the space 13 and there is little tendency to warp or burn out. i

The openings or perforations 14 taper upwardly like the openings or perforations 3 to choke down the air passing from space 13 into said perforations 14 and to thereby increase the pressure. The upper ends of the openings or holes 14 are flared, as shown at I 15,'wh1ch more readily distributes the air. The upper face of each section 7 is provided with-distributing grooves or channels 16 which are wider at the top than at the bottom to effect a thorough distribution,

of the air to the 'fin'e fuel lying on the sections 7. The flared parts 15 and the grooves or channels 16 may assume different forms, and I do not limit myself, except where specified in the claims, to the design or form shown in the drawings.

One modification is shown in Figs; 6,8 and 9, where in substitution for the holes 14, I provide elongated slots 17 which are provided with elongated flared mouths 18 for the same purpose as the mouths '15 The face of the sections 7 is in this form, provided with grooves. or channels 19 wider at the top than at. the bottom, and connecting thefiared mouths 18 of the different open forth and shown in the drawings, but in the provisionof channels, however formed, communicating with the openings, however {formed, which extend from the bottom'to the top of the sections 7 and, further, in

such construction combined with the flared mouths of the openings which extend through the sections 7, whether such flared mouths be of'the form shown at 15, at 18, or of other form.

The air under pressure passing through the opening 14, or 17, spreads out over practically the entire'upper face of the section and is distributed with great uniformity to the fine fuel resting on the sections "7, thus insuring a high degree of combustion and minimizing dead spots in'the fuel.

The supplemental grate bar being composed of individual sections 7, and .thussplit up into a pluralityof parts, has little tende ency to warp because these sections have no ribs,"iare of equal thickness, and the air distribution is substantially equal over the entire supplemental grate bar thus provided. Having thus described my invention, what I claim as new and desire to secure by Let- Y the rethrough and which is provided on its upper. surface with channels extending U the main bar and separated therefrom by an t v v a I lntermedlate air-space, sald sectlons bemg each provided with several air distrlbuting openings extending from their lower to (their upper faces and communicating with said: air space and also having on their upper fuel supporting faces air distributing channels extending indifferent directions lengthwise and crosswise thereoffrom the different air distributing openings aforesaid.

3. A grate bar composed of a main part having numerous relatively small openings; and a supplemental part, surmounting the main part and whose-top is raised above and separated fromthe top of the. main'part by a free air space, said supplementalpart being composed of independently attachable and removable sections each of which has air openings extending therethrough and is providedon its fuel supporting sur-' face with intersecting air distributing channels arranged lengthwise and crosswise of the bar and communication with said openlngs. o y

, 4; Agrate barconsisting of a main'grate bar and a supplemental grate bar composed of a pluralityof sections each havinglegs resting on'the main grate barand supporting and spacing it above the main grate bar, and independent connectorsv fastening the said sections to the main grate bar. o

o5.'A grate bar consisting of a main grate bar and a supplemental grate bar composed of a plurality of sectionseach having legs resting onthe main grate bar f and supporting and spacing it above the main grate bar;

said main. grate bar having lugs engaging the legs of the said sections, and 'independt ent connectors fastening saldsections 1ndependently to thejmain grate bar.

Intestimony whereof, I hereunto affi'x my signature in presence of, two witnesses.

Witnesses:

GILBERT J. SLY, S. B'. BULKLEY.

copies of this patent maybe obtained for five cents each, by addressingthe Commissioner of Ifatentls, v

Washingtomi). Q. I I

' THQMAS I-L sLY; p

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