US1329447A - Furnace grate-bar - Google Patents

Description

. 1 UNITED STATES PATENT OFFICE.

.tubular grate bars such as .shown 1n Patent JOHN VAN BRUNT, or NEW YORK, N. Y., AssIGNoR To oOMBusTIoNENeINEr-:RING CORPORATION, or NEW YORK, N.v Y., A CORPORATION OF New lYORK.

FURNAOE GRATE-BR.

, I Specification of Letters Patent:

Application iledJuly 15, 1918. Serial No. 244,861.

To all tolzom t may concern.' Be it known that I, JOHN VAN BRUNT, a

citizen of the United Statesresidin at the city, county, and State of New Yor have inventeda certain new and useful Improveement in Furnace Grate-Bars, of whlch the tion.- My invention relates to improvements in grate bars and is particularly applicable to @following'is a full, clear, and exact descrip- It has for its-object 'tol produce a grate bar in which the evils 4of -the swelling'or blossomin buningo its upper surface, are reduced.

granted to W. R. Wood, April portions'of the bars.' Thisis done because.'-

when'the grate b ars are in use .extreme-heat causesthe upper surfaceof the iron to burn somewhat and to swell so as to increase the lateral dimensions, and if the upper portions of the bars were closely adjacent to one an- 'other this swelling would cause the" bars to bind so as to-close. the air assages between themand also interfere wlth their relative.

movement. With kgrate barsas now constructed, theonly provision made'for guarding against the deleterious effects of such swelling has been the tapering above referred'to.

tion, however, I- make additionalprovision by forming longitudinal grooves 1n the up`- takes place upon that upper surface can in Vention,

Y part expand into-4 these additional grooves independently of the space and ,be taken u left between a jacent bars bythe tapering of the sides above referred to.

The following are descriptions of several embodiments of my invention, reference be in Qhad to the accompanying drawings, in wlich,

Figure 1 shows a grate bars from a grate embodying my iii- .shown in Fig. 5, and

'Fig. '7' is a transverse section of a twogroove bar havin effect, due -to high heating'or:

ate barsfor stoker furnaces and the like, 1t @has heretofore been customary to taper the upper-'portionsof the sides slightly In accordance with my inven-44 channeled members 20-20" gether byrivets 21: The parts 20-20 are provided ywith abutments 22v which, when the rivets21 are in place, are heldin 'engage-l --the part 20',

plan-view of a pair of Fig. 4 is a' transverse. section of a modiiication in' which a employed; Fig. 5 is` a transverse section of a bar plurality of grooves are embodying my invention and having two pper portions in sliding engagement with' .one another;-

lFig.` 6 isa detail of the construction three upper portions', two o fwhich'arein 1d1ng engagement with the t ird.

Referring more particularly to the draw- Patented Fens, 1920.4` e

ings, 1 1 aretwo channeled castings hav- 'ing their upperouter corners 2 2 beveled, and having their upper inner corners also beveled as at 3 3 so as-to form a longitudinal groove down the center of the upper surface of 'the bar, These two bars are` held togetherloy rivets 4. The castings `being channeled form a tubular bar suitableto be used in the Stoker described in the Wood Patent No. 818,010 above mentioned.

(as shown in Fi'. 1.v

In thefconstruction-shownin Fig. 4, there are threelongitudinal castings, 10-10-102, earch of which-has both of its upper edges beveled so as to'form-two grooves 11 between the intermediate casting 102 and theouter castings 10 and 10 and sothat the outer castings have externalslanting surfaces 12. The two castings 10, 10- are channeled so as to form atubular bar and are held together by rivets 1 3; j

Inthe construction shown in Fig. 5 two are held toment with one another and Aactto space the parts 20420 apart.' The part 20 has a;- laterally extending portion 23, which liesbeneath and is engaged by the Iunder-surface of a laterally extending portion 24 upon have slanting engaging surfaces, as shown at 25, the engaging surface at 25 on the part 20 lyingbeneath the surface on the part the .engaging surfaces being substantially horizontal. The two parts also In the construction shown in Fig. 7, three castings 30-30--3O2 are employed, held 'togetherby rivets 3l which pass through all three of them. vThe sections 30 and `30 vare channeled and provided with abutments 32,

while the section 302 is provided with abut- `ments 32 and divides thel passageway through the bar. The lsections 3Q and 30 are provided with extensions 33, while the section 302 is provided with extensions 34;, v

which overlap the extensions 33. The lower portions of the sections are provided with inclined engaging surfaces, as shown at 35, the surfaces upon the member 302 lying beneath the surfaces upon the sections 30-30 so that as the sections are all held together, engagement at this point tends to hold the lower surfaces of the portions 34 against the upper surfaces of the extensions 33.

In all the forms shown the bars are tubular `and the deleterious effects of the heat are reduced-by the provision of the longitudinally extending grooves formed by the op-v posingbeveled faces in the surfaces of ad# jacent portions of each bar, while in the form shown in Figs. 5 and 7 further provision is made for taking up expansion' due to `heat by permitting the two parts of a bar to move relatively to onek another,v The sections of the bars" being made of castings and the beveled surfaces forming the grooves coming at -theedges of these castings, the complete bars with their longitudinal grooves can Vbe easily formed 'without machining so as to produce a product which 1s inex.

pensive to manufacture and advantages when in use.

yet has decided those skilled inthe As will be evident to' Q art, my inventionapermits various modifica tions l. without departing from the spirit thereof or the scope of the appended claims.

WhatirnI claim is: n A l.- In a stoker grate' a plurality of juxta.

Lasarte? posed tubular grate bars spaced apart from one another at their central portionsso as to provide air passages, each grate bar having its upperouteredges beveled so as to presen/t'surfaces slanting upwardly toward one another forming flaring mouths for said passages and having a longitudinal groove in its upper surface between said slanting surfaces, permittinggrowth of the tops of the bars in both directions without closing the passage between, adjacent bars.

2. A tubular grate bar comprising two castings having longitudinally extending sidechannels forming the bore of said tubular bar, each casting having its two upper edges beveled so as to present surfaces slanting upwardly toward onef'another, `two of -the surfaces on said bars forming a longitudinally extending groove between the other two surfaces.

3. A tubular grate bar comprising a mem-- ber having in one side'thereof a` longitudi nally extending-channel, a member coper.

ating therewith to form the bore of the t-ubu,`

lar bar, the upper pqrtions of said members being spaced apart laterally so as to form a groove in the uppersurface Vof the bar and be adapted to move toward one yanother under the effect of variations in heat, said members having adjacent., to their vtop portions upwardly and downwardly facing surfaces respectively in engagement with one i another, and means for holding said mem`- bers together.

4. A tubular grate bar comprising a member having in one side thereof longitudinally extending channel, `a member co'- op'erating therewith to form the bore of the tubular bar, the upper portions of said members being spaced apart laterally so 'as to form a groove in the upper surface of the bar' and be adapted tovmove toward one" anfother under the effect of variations in heat,

said members having adjacent to their top portions upwardly and downwardly facing surfaces respectively in engagement with one. another, means for holding said members together, and spacers within the bore of the tubular bar, said holding means being` located below said spacers.

'JOHN 'van nnnnr.

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