US1117145A - Fire-box for boilers. - Google Patents

Description

A J; LBI'GHTY. FIRE BOX EUR BUILBR.y

APPLICATION FILED MAY 11, 1914:.

mme@ N0v.1o,71914. gsHEETgfsHEBTl Wnnmmml Witnesses. J

. J. LEIGHTY-1 j PIRE Boxro BQILBRS. APPLIG-'AVTION HLBDMM 11', 1914.

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W. J. LEIGHT-Y.

. FIRE BOX POR BOILERS. APPLICATION FILED MAY 11,1914.

1,1 p, Patented Nov. 10, 1914.

9 SHEETS-SHEET s.

Falg.,

O Q Q Witnesses. fmw

W. LLEIGHTY.'

FIRE BOX FOR BOILERS.Y

APPLICATION FILED MAY 11, 1914'. I 1 9 1L 1 "ys 14@ l Patented NOV. 10, 1914.

9 SHEETS-SHEET 5.

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0 OOO0000000000000000000000 W. J. LEIGHTY.

FIRE BOX. FOR BOILBRS. APPLICATION FILED MAY 11,1914.

Patented? Nov. 10, 19m.

`9 SHEETS-SHEET 6.

Fig. 6.

oovooo OOQQ ' OOO Witnesses.

W. J. LEIGH'IY. 'FIRE BOX FOR BOILBRS. APPLICATION FILED 11u11, 1914.

l l l '71145, vPatented Nov. 1.0, 1914.

9 SHEETS-SHEET 7.

Fig.

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ooooooeoooooooo oooooooooooooooooo O Oocfqwg/ W. J. LEIGHTY. PIRBBOX POR BQILBRS. APPLICATION FILED MAY ll, 1914.

.Patented Nov. 1o, 1914.

. SSHEETS-SEBET 8.

W. J. LEIGHTY. HRB B0X FOR BOI'LERS.

.APPLI'GA'TION FILED MAY 11 1914.

Patented N0v.10,1914.

9 SHEETS-SHEET 9'.

Witnesses.

narran srarns retirant-r oramai.

WILLIAM J. LEIGHTY, orsrnINGrInLn, iviissenm.'

j FIRE-BX non seitens. y

To all whom it may con-cem citizen of the United States, and a resident of Springfield, in the county of Greene -and State of Missouri, have invented a certain newand useful Improvement. in Fire.

BoXesfor Boilers, of which the following is a. description, vreference being-had to the accompanying drawings, which form a part of my specification. -1

My invention, asdisclosed in the drawings, relates more particularly. to fire-boxes for the locomotive type of boilers, it being understood, however, that the invention may be readily applied to boilersof` various types. f

One object of my invention is to provide a fire-box which will be provided with water-tube side walls,lthu`s resulting in afiirebox of greater safety than may be had with fire-boxes as at present use,

A furtherobject of .my invention-is the provision of a fire-box provided with'watertube side walls and anintermediatewatertube wall so 'that a considerably .greater heating surface area within the fire-box` will.

' and six-tenths l of heat units from the re and hot gases of p be provided, thereby producing greater evaporative efficiency for the boiler due to the fact that the heating surfaces of my improved fire-box willbe substantiallyseven greater than that of the firetube area of the boiler.

Another object of-niy invention is the.

provision of a fire-box that will be=zmore economical in fuel consumption as a result of ythe increased v-iirefbox heating surface relative to `the total 'heating surface of ,the boiler: the construction being suchlthat the fire-box .heating surface vis so disposed that it will absorb the greatest possibleamount combustion. y

Another object of my invention is the provision of ahrc-box which will besimple in design, as well as eficientand ineXpensive; the fire-box being of a construction which may be made at a moderate cost without' necessitating the employmentv ofI special or expensive machinery; and which may be readily applied to any ordinaryexisting locomotive boiler through themere -replacement' of the present-type of fine-box; the fire-box to a considerable extent "eliminating the difficulty heretoforevencountered in staying the fire-box and shell-sheetsfby speer/aeration of Letters Patent.

atented'Nov. 19, 1914. g

Application 1dMay 11, 1914:. Serial No. 837,839.

reason of the substitution' of the water- I tubes and chambers of. vheaders at the top lof the fire-box, as Well as thesubstitution ofl a heavy, hollow mud-ring at' the bottom; the arrangement of the Water-tubes or heating 'surfaces lof the fire-box being such, however, as not. to interfere with or baffle the hot gases in their passage through the fire-iues of 'the boiler. i The advantages above set forth, as well as other advantages inherent in the construction,'will be readily apparent from the following detailed description of the accompanying drawings, wherein-:-

Figure l is a perspective-.view of my im-v proved. fire-box with a portion of the boiler, of the locomotive type, shown secured thereto, and with the outer lagging ofthe firebox shown 'omittedfan'da portion of the side wall ofthe fire-box shown. in sectionl in order to disclose the internal construction.

Fig. Q-is a longitudinal .sectional -view,-.in perspective, of thel 're-boxf illustrated in Fig. f1; a. portion of the'intermediate section of the mud-ring being shown in side elevation,l whiley the ends ane shown in section.

Fig. 3 isfaltransver'se vertical sectiontaken on theline A-,-A of Fig. 2, looking inthe direction of: the arrows.: Fig. te' is a perspectiieview offthethroat-sheet of my improved ire-bo'zLL i Fig', 5 illustrates; the uesheet of myimprovedre-box, in perspective, therebymore. elearlyillustrating lthe Off-set sides, .fon taking .up lateral expansion. Fig, 6.-is a perspective view of the door-v the same` provided with off-set sides for taking up lateral] eXpansion.- Fig. 7 is a vdagrammatic view illustratingthe method of laying out the top corners of the fine-sheet and door-sheet of my improved (ire-box. Fig. 8 is a perspective View of the backhead employed lin connection with my improved fire-boxl construction. g Fig. 9 isv a4 perspective.viewy of my improved sectiona mudring, with one side or lsection thereof being shown separated or detached from the remainder of the mud-ring, and with a por-v tion of the assembled .or remainder of the 1nud-ring shown' in partial'cross section in4 order to more clearly `disclose the internal construction thereof. Fig.,10v is fa perspective 4View ofone of theintermediate portions of the crowngsheeapdisclosingtheopenings for receivingl the rupper ends of the water-tubes, some of which constitute the` intermediate' wall, while others' partially constitute the side walls of the tire-box. Fig. ll is a perspective viewA of one of the side `portions of the crown-sheet, showing the openings which are adapted to receive the upperends of the waterstubes which constitute the other or remaining portion of the side wall of the lire-box. Fig. 12 is a perspective view of one ofthe watertubesv which constitute a portion of the side walls-of the tire-box, namely those whereby the outside. longitudinal section of the mudring is connected with the outside section or portion of the crown-sheet. Fig. 13 is a perspective view of one of the water-tubes which constitute the other portion of the sidewalls of my improved lire-box, namely those whereby the longitudinal side sections of the mud-ring are connectedwith the in-A termediate section or portion of the crownsheet located on the same side Aof the fireboK as the section of the mud-ring from which the water-tube extends. Fig. lJc lis a perspective view of a water-tube employed to constitute the intermediate row or wall of tubes, whereby the intermediate longitudinal section of themiidaing is connected with the intermediate sections or portions of the crown-sheet.

ln thepartieular exemplilication of my invention, as illustrated in Figs. l Iand 2, only a portionof the cylindrical barrel or shell ofthe boiler is shown, because the boiler construction forms no part of my in vention. The construction, as illustrated in the drawings, comprises a front water-leg formed by the throat-sheet 20 and the duesheet 2l, as more clearly illustrated in Fig. 2; the lthroat-sheet and flue-sheet being secured or stayed together byrmeans of the stays 22; the flue-sheet or rear wall'of the water-leg being stayed to the barrel of the boiler by means of the braces or stays 23 and 24. lfhe bottom of the frontwaterleg is formed by the transversely extending front end of the sectional mud-ring as shown at 25 in Fig. 2, where the front end of the mud-ring is secured between the bottom portions of the throat-sheet 2O and the liucsheet 2l; the mud-ring being secured by means of the rivets 2G,see Fig. 2, -in accord ance with the usual practice. The lire-box is provided with a back water-leg formedv b v the door-sheet 27 and the back-head 23, which arestayed together by means of a suiiicient number of stay-bolts 29, disposed throughout the opposing dat surfacesof said sheets; while the remainder or unstayed fiat portion of the back-head is stayed or secured to the roof-sheet 3() means of the stay-braces 3l, as very clearly disclosed in Fig. 2. The bottom of the rear or bach water-leg is formed by the transversely elitending rear end 32 of the mud-ring, which Lirama is secured between the door-sheet 27 and the backhead 28 by. means of the rivets 33, in

a manner similar to that employed in con .or arms in order to constitute solid transverse portions or ends which are formed. by

the projections or portions 34, 34, at both ends of the sections. 'In .the particular exempliication of the invention, the projections are adapted to overlap the laterally projecting arms or portions 35, 35, at both ends of intermediate member 35; intermediate member or section 35 being provided with the projecting arms or portions 35a projecting from opposite sides of the member, as very clearly shown in Fig. 9. `When assembled, the overlapping projections or arms of all the sections are properly secured together as for example by means of rivets passing through the rivet holes 36.

manner shown, is to obviate any diliculty that might otherwise be encountered by reason of internal strain, were the mud-ring cast in one piece, as the sectional construction of mud-ring will relieve any internal strain that might be had if the mud-ring with its hollow sections were made in one piece; and, furthermore, a mud-ring as illustrated can more readily be cast than if made j as a. single unit. The various longitudinal hollow sections 34,34, and 35, of the mudring, are provided in their upper surfaces with suitable openings or orifices 37 adapted to receive the lower ends of the water- tubes 33, 39, and a0, which are so arranged as to constitute the side walls and' an intermediate wall of the lire-box. The under surfaces of the longitudinal sections 34, 34e, and 35, of the mud-ring are preferably also provided with openings al, correlated to or in alinenient with the openings 37 in the upper surfaces thereof. The purpose in thus ar ranging the openings is to permit the lower ends of the water- tubes 33, 39, and l0 to beproperly rolled or swaged, or welded if preferred, into the orifices or openings 37 in the upper surfaces of the respective longitudinal sections ofthe mud-ring. The openings 1li, provided in the bottoms of the respective longitudinal sections of the mudring, are normally intended to be closed by One l Aobjectin constructing the mud-ring in the iis a suitable means, preferably by means of threaded plugs 4-2, see Figs. 2 and 3; although any suitable means may be employed, as for example hand-hole covers and the like, whereby a fluid-tight connection may be effected. The ends of the longitudinal saar-'a' chambers of the vrespective sections 34,34',

and 35, are preferably made to y m'erminate front and back water-legs of the tire-boxy is established. I t

The upper part or crown or' vmy improved iirebox is preferably composed of four longitudinally. disposed Vchanneled sections 4 4, 45, 46, and 47; the sections 44 and 47 being identical in general contour, as very clearly shown in Figs. 3 and 1l, while the sections 45 and-.46 are identical in general contour, being preferably formed so as to provide a deeper channel than that of the side sec? tions, as is very clearly disclosed in Figs..

3 and 10. The object in thus deepeningr the channel of the intermediate sections 45 andl 46 is to enable the water-tubes leading thereto to be formed at the upper ends along as direct or straight lines as possible, without the necessity of providing the tubes with ,a reverse bend at the vupper ends thereof, which would tend to make the tubes dii`- cult in cleaning. As very clearlyi shown in the figures just referred to, the sections are provided with the substantially perpendicular sides or flanges whereby the adjacent section sare secured together by means of the intermediate calking strips and the sling-stay anchors 48, 49, and 50, as very clearly shown in Fig. 3. Secured to the roof-sheet 30 and preferably in vertical alinement therewith and in an opposed manner, I provide the anchor-bars 5l, 52, andA 53, to which the crown-sections are secured or stayed by means of the sling-stays 54 connecting anchors A`48 and 51, sling-stays 55 connecting anchors 49 and 52, land sling- Stays-56 connecting anchors 50 and 53, thus providing a vthoroughly stayed crown for The .inner s1 previously stated', are formed by series of 'tubes disposed perpendicularto' the bottom or mud-ring of the're-box, with each alter-v nate tube, namely the'tubes designated as 38 extending from the "side Vlongitudinal sec- 47 of the crown-sheet.

the inner side walls of the refbox, connect the side lon 'tudinal sections of the mudring with t e intermediate longitudinally.

disposed channel- sections 45 and 46 of the crown-sheet. The intermediate or silbstantially central wall of the re-boX is composed of the tubes 40 which are connected tothe intermediate hollow longitudinal section of thev mudfring, while the'upper ends of the', alternatetubes Aof the intermediate 'wall connect with; 'the channelsections 45 and"46,'-irespectively, located on opposite 'easier a@ de Wang' of the ere-bog, si

Y The back-'head 28' sshown Thev arrangement of the tubes as just de` scribed, visfveryrclearly set forth in Fig. 3, from-which. it is apparent `that circulation may take, p'l'ace'between the upper and lower parts of the rire-box, (aside :trom-that. existing between the front and back water-legs and the -upper part vof 'theuire-box), by

means lof the tubes which connect with lthe various hollow longitudinal sectionsof the mudLring. "'f. As more clearly disclosed i '."3, itv will be'noted that the longitudinay' 'disposed channel-sections 44 and. 47 .,of'j'the crown sheet of the fire-box, .arelseclredat their outer edges to the roof-sheet 30 by the 'rivet seams 57' and 5 8, respectively, with` an interposed liner 59, 'which also serves'as a support'vto the upper portion 6 0 fof-'the' outside wrapper" sheet of the l'ireebom asv very clearly shownlin Figs; l and The ends of the roofsheet 30 aresecured by means of therivet seam 6I to the 'throat-sheet() at' the forwardlend 'of the ire boX, and by meansofftherivet seam 62 t the back-head 28 vat the rearendof the tire-box, as very clearly .disclosed in Fig; 2.' 'A

The' upper ends of the wateretubes 38', 39,

and 40 may'be--securedto the respective portions ofthe crown-sheet in anywell known manner,' but preferV to 'weldthe same so 'as to form; the ends of the tubes integral with water-tubes-in`the`-respective sectionsof the -the respective sections 44, A45,(46, and 47, of

eted'into place, thus allowing' ready access f to the tubes as; will 'be readily understood.

In case, of repair or'renew'al of thejLtubes, Y

the roof-.sheet Z50-can be iplililyremoved4 by cutting thelrivetsintherivet seams 57,558, .6.1, and 62,' and by' lemov'ns'fhe pins infth 1v1-.10

sling-stays 54,. 55, and 56, and the pins` in the stay-braces 31. j'` f f a number of hand-holes 63,.63,'Whereby aofi cess tothe rear .e'ndf4 of thef'sections or porq f As the Y various water #tubes\ 38, 39, and40 I I I are .provided with .a single b jend or curva'- ture, it `will readily hbe understood thatftheyv can,' therefore, be easilyhcleaned by`means `0f lniown. type of flexible tubel ,maybeinserted therein, from siblsbyliijeason O'fthfe handholes 63. The iinprtacdof this construction will- 'be t endsl of the tubes, madepos-k Y i lbe had, either'ifor theV purpose of inspection readily apparent, as the scale accumulatinir within the tubes can be readily removed thereby insuring greater eiliciency.

It is evident from the construction shownl and described, that, the pins at the ends olf the stay-braces 8l may be removed, allowing the. stay-braces to be dropped down onto the crown-sheet, orremoved rom `within the hre-box, so as to permit the operator to enter the steam and water space above the crown-sheet in order that he can properly operate the cleaner; it being understood, of

. course, thatl the operator .may enter the tour of the channel- sections 44, 45, 46, and

47, of the crown-sheet; and the sections of the crownsheet are secured to the flue-sheet 2l, the indentations whereof are preferably hanged rearwardly, as shown at 21a in Fig. 5, so as to provide a substantially horizontally disposed portion which may overlap and be riveted to the forward ends of the channel- sections 44, 45, a6, and 47, as clearly disclosed in ig. 2; the flange-portions 2l of the due-sheet 2l being,l formed so as to conform to the transverse contour of the channel-sections, as can be seen in Fig. 5. Therear ends of thc respectivesections of the crown-sheet are secured to the door-sheet 27 in a similar manner; namely the doorsheet has its upper end engrailed so as to provide concave indentations, similar to those in the iiue-sheet, provided with the forwardly presented llanged portions 27a, as very clearly shown in Fig. 6, which overlap the crown-sections and enable them to be riveted to the door-sheet in a similar manner to that previously described in connection with the flue-sheet. The manner of laying out the top corners of both the {ine-sheet and the door-sheet, in order to produce the engrailing and the flange portions described, is shown in the diagrammatic view in Fig.

i where the dotted lines indicate the places e where the sheet is to be bent so as to produce the construction ot sheet previously shown and described. ln order that a proper joint may be obtained, between the side, vertically disposed Hangs-portions 27 b ot the door-sheet and 2lb of the flue-sheet,

and the tree ende 2 C, :27 of the doorsheet and 21C, 21C, of the tluesheet, l prefer to weld the disconnected or i'ree ends 21C yand 27C and thus torni a water-tight connection.

ln the preferable construction oit the fire box, l prefer to cset the sides oft both the armies flue-sheet and the door-sheet and thereby reduce any internal strain that may be set up due to unequal expansion or contraction on account of the varied temperatures to which the diierent sections of/the sheet are subjected. f i

Both the flue-sheet 2l and the door-'sheet .27 are providedv at their bottomends with mnd-ring; the liuc-sheet and door-sheet, adjacent to the cutout portions referred to,

are riveted, or otherwise secured, to the vertically disposed portions 64C of the respective sections of the mudring,said portions be ing more Iclearly disclosed in Figs. 2 and 9.

vFrom an examination of Figs. Zand 8 the circulation of water and steam will be clearly understood; the water will enter the chambers of the longitudinally disposed sections of the mud-ring from the front Waterleg and from the rear water-leg, and in the normal or proper condition of the boiler, the water will pass through the respective water- tubes 38, 39, and 40, thus permitting the water to circulate freely along the top of the crown-sheet, passing upwardly and downwardly through the water- tubes 38, 39, and Ll0, in accordance with the temperatures of the various portions thereof.

As is clearly disclosed in the drawings, the water-tubes forming the side as well as the intermediate walls of the Firebox, are

preferably arranged to slope slightly forward troni the bottom to top, for the purpose of accelerating' the double circulation set within the tubes; it beingI understood that the tubes are or' comparatively large diameter. ln arranging the tubes with a slightly forward slope as disclosed, the pcrtions or globules of steam will have a tendency to collect along what may be termed the rear side wall oli' the tubes as 'the particles or globules ot steam rise, thereby giving,- an opportunity for thecolder water over the crown-sheet to 'flow downwardly along, what may be termed the forward wall et the water-tube, and thus create an internal circulation within the water-tubes. Tt is evident, therefore, that my improved con liti struction provides a complete or 2generous circulation in all parts of the lire-bon which are. intended to contain water.

l prefer to :torni the intermediate slingA anchor or bar 52 so as to provide reiniforc ing,` rings or portions 65 and 66 about the opening tor the auxiliary deine the opening for the steam-fountain, respectively, 3

thereby obviating the necessity'of usingsepf,

arate liners for these boiler apertures, at the same time providing a suitable anchor for the sling-stays 55. y p

As more clearly disclosed in Fig. 4, I prefer to construct the throat-sheet 20 'ina' l single piece, which is accomplished by pressing a sheet of steel into proper shape and thus'simplify the operation of riveting up the fire-box and 'making its proper Aconnection with the boiler-shell.

It is understood, of course, that thev throat-sheet, like the {ine-sheet, is properly riveted tothe transversely extending portions at the forward end of the sectional mud-ring. These transversely extending tending ends are shown provided with a de-4 pending portion 68. which constitutes 4an lanchor for the expansion pad between the back-head and the engine-frame.

By arranging the water-tubes in the man -A ner shown and heretofore described, namely by having the successive tubes of the various series connected with diderent sections of the crown-sheet, it is apparent that they form an open'lattice work over the topof the fire-box,v through wl1ich .|the hot gases may circulate and be permitted to impinge against the bottomsurfaces of the respective sectionsof the crown-sheet and thus permit or' a more rapid heating of the boiler con tents. Y

It will be understood, ofcourse, that with the fire-box provided with the intermediate` or central wall of water-tubes, the backhead of the fire-box andthe door-sheet are provided with two fire-door openings as shown at 69 in Figs. 1, 6, and 8, thusper-` mitting proper access to both sides of the. Y A

' l a plurality of separable hollow longitudinal tire-box.

The. spaces at theiupper end ofv the fire-1 box, and at thesdesthereof, may be provided witha lire-brick lining: as shown at 70 in Fig. 3, secured against vertical l:disL

' placement: vin any suitabley manner fand against lateral displacement bymeans of the water-tubes 38 and -thesection's 44 and of the crown-sheet.

In addition to providingfthe door-sheet 27 Awith off-set sides 27", asv very clearly vshown in.. Fig.` 6,'-I,prefer also: to provide the door-sheet 27 with a bulge or pocket27e p' disposed longitudinally at a point intermefdiate of thev f hre-door openings 69;4 the pocket 27e beingpreferably larranged tof bulge into the water-'leg intermediate of thel door-sheet 27 and the'bacliiliead 28, as very a plural-ityof separable hollow'longitud portions provided with openings so as "to,

`relative'position. v f l ja;- 3 -'6. In a lire-box of the classdescribed, a

clearlyshown in Fig. 2. The object 'in providing the door-sheet`27 with 'the bulge 27' disposed a direction -lengthwise of the sheet, is to compensate for the transverse expansion that may occur in the re-boX or ofthe sheet in taking up or rather permit lateral expansion thereof.

vsides .thereof andthus assist the off-set sides 'L I have shown and described what r bei lieve `to .be the simplest and best form of my invention and, thereforeQdon'ot attempt;

to show and describe all formsof'construcl tiontliat may embody my invention; but it is obv1ousf-from the foregoing description and illustrations that theinvention may be readily applied to different styles of boilers without, however, departing' from the ,spirit of myinv'ention; and I doznot, wish to .be understood, therefore,asI limiting myself to the exact construction. shown` and described.

What I-claim is:' l. A lire-box of theclass described,,pro``r -vide'd'with a front aud aK-bapli4 fluid-contain?" ing head, a crown-sheet composed ofa" sefl ries of longitudinally disposed, chaunnele'd` sections, a sectional mud-ringprovided'with longitudinally disposed fluid-containing headers, and means disposed longitudinally" of thev fire-box, at the sides and longitudinal centerf'thereof, whereby communication between the longitudinally disposed headers of the mud-'ring and the water space abo'vjef the crown-sheet maybe had. y 2.. In a fire-box, a mud-ring composedof, .a plurality of separable hollow longitudinallportions provided with transversely dis;y posed portionsat the ends thereof wherebyv the longitudinal portions areffsecuredl t'o-l gether.y

vmln a fire-box, `a mudring composed;

two separable sides and an interni'ediateh ,h'olij.,`

low longitudinal portion' provided'- Withf openings inthe upper surfaces thereof, 'andi means v;her-eby thejsides and yintermediate: longitudinal. portion are secured together'. and maintained in proper relative positionli 4. Ina {ire-box, a mud-,ring ldomposed'of portions provided with openingsin 'the up'- per surfaces`- thereof@ and means i'vlivereby permit circulation therethrough, "and means'l cured. together sind maintained-iin iPer-H mud-ring composedfof a 4'plurality ofl sepaj .wherebysaid longitudinalijportionsare'sef i 11,5? said longitudinal portions are secured'itogetherA andmaintained yin proper relative boa and throughfsaid sectionsmay be had, and means whereby the longitudinal portions are secured together in proper relative position.

7. ln a tire-bon of the class described, -a mud-ring composed of a plurality ofseparable hollow longitudinal portions the ends whereof are provided with solid transversely extending portions whereby the longitudinal portions are secured together in proper relative position.

8. ln a lire-'box of the class described, a mud-ring composed of separable hollow longitudinal portions, the ends, whereof are arranged at an angle thereto so as to pen mit the portions to be secured`together in proper relative position, and means whereby circulation through the hollow portions may l mud-rino" composed of separable hollow lon? gitudinal portions adapted to form sides and intermediate sections, 'with the ends of the portions being formed at an angle thereto and arranged to overlap one another so as to permit the portions to be secured together and be maintained in proper relative position, and means whereby circulation through the'sides and yintermediate sections may be edected.

l1. ln a hre-box of the class described, a mud-ring composed of two 4separable side hollow sections and an intermediate hollow section, the ends ol the respective sections .being provided with solid transversely distoA posed portions whereby the respective sections are secured together and maintained in proper relative position, the sides and intermediate sections being provided with water-tube receiving openings in the upper surfaces thereof and correlated openings in the bottom. surfaces thereof, and means whereby the openings in the bottom surfaces ot said sections are normally closed.

l2. lln a hre-boa oli the class described, a mud-ring having hollow longitudinal sections open at the ends thereof, a due-sheet 4the upper end whereof is engrailed and ,pro-

vided with horizontally disposed dange por tions, while the lower end is provided with cut-out portions adapted to receive the ends of the longitudinal sections of the mudruig.v

13. ln a lire-bon of the class described, a Hue-sheet provided with a flat flue-receiving portion and with vertically disposed Bange portions arranged along the sides' thereof, said flange portions being od-set, the upper end of the flue-sheet being indented or engrailed, while the lower end is provided :ai iii/,isa

vwater-tubes arranged intermediate of the longitudinal water-chambers of the mudring and the channels of the crown-sheet lwhereby circulation between the bottom and top of the lire-box may be had.

l5. A'ire-bozi of the class described, comprising a crown-sheet composed of separate l channeled sections, means whereby the sec-- tions are secured together and suspended from the roof-sheet of the fire-boina mudring composed of separate side and intermediate hollow sections longitudinally disposed of the lire-box, said sections being re` .movably rsecured together and provided with openings in the upper surlfacesand at the ends thereof, and water-tubes arranged in the openings of the mud-ring sections and extending upwardly to the crown-sheet sections whereby communication between the hollow sections of the mud-ring and the space above the crown-sheet is established.

16. A fire-box of the class described, comprising' a crown-sheet composed of several channeled sections secured together and supported lfrom the root-sheet ot' the hre-box, a mud-ring composed of separate hollow longitudinal sections adapted to be secured together, and water-tubes ot' vcon'iparatively large diameter arranged intermediate of the hollow sections of the mud-ring and the channeled sections or" the crown-sheet, said water-tubes being arranged to slope torwardly toward the upper ends thereof whereby. circulation intermediate ot the crown-sheet of the hre-box and the mudring and within the water-tubes will be iuduced.

l?. ln attire-box of the class described, a plurality 'of water tubes of comparatively large inside diameter, said tubes being arranged in series s'o as to constitute an intermediate and two side walls within the hrebox, the tubes being provided with a single bend at a point intermediatev oit the ends 'thereof for the purpose of taking up unequal contraction and expansion.`

18. ln a hre-box of the class described, provided with a mud-ring having hollow longitudinally disposed portions with openings in the top surfaces thereof, and a' plu rality of water-tubes of comparatively large internal diameter, said tubes being arranged in series so as to constitute an intermediate and two side walls in the fire-box, the lower lic ends of the tubes being reduced and secured in the openings of the mud-ring.

19. Ina fire-box of the class described, anchor-bars longitudinally disposed of the fire-box and secured to the roof-sheet thereof, one of said anchor-bars being provided with ring-portions intermediate of its ends at points coincident with and extending about the auxiliary dome and steam-form tain aperturesof the fire-box. 4

20. In a re-box of the class described, provided with a front water-leg formed by a single piece throat-sheet and a flue-sheet having off-set side portions, and a back water-leg formed by the back-head and the door-sheet, the latter being provided with' olf-set side portions, a crown-sheet composed of channeled portions extending longitudinally of the ire-boX and removably secured to the roof-sheet of the re-box, a mud-ring composed of a plurality of hollow longitudinal portions having openings in the ends thereof arranged in communication With the front and back Water-legs of the fire-box, and a plurality of water-tubes arranged intermediate of the hollow portions ofA the mud-ring and the channeled portions of the crown-sheet so as to permit of circulation of water therethrough, said water-tubes being arranged to constitute the inner side walls of the fire-box. y.

2.1. In a lire-box, a door-sheet provided with an olf-set pocket or portion arranged to bulge into the rear water-leg of the fire-box,

said pocket being arranged lengthwise of the sheet so as to allow transverse expansion of the sheet.

WILLIAM J. LEIGHTY.

Vitnesses:

FRANCIS A. Eoorr, DANIEL M. LIGHT.

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