US1093430A - Boiler. - Google Patents

Description

1,1. W. JACOBS;

BOILER.

APPLICATION FILED 1123.21, 1a1s.

Patented Apr. 14,1914,

5 SHBETSr-SHEET 1.

1" N\ My k R 1% N W m mm in Na NM 33 mm a H. W. JACOBS.

BOILER.

} APPLICATION TILED APR. 21 1913. 1,093,430, Patented Apr. 14, 1914. 5 SHEETS-SHEET 2.

Q Q Q Q WI 'INL'SSES: IN VEN TOR.

H. W. JACOBS.

BOILER.

APPLICATION FILED APR. 21, 1913.

Patented Apr. 14, 1914.

6 SHEETS-SHEET 3.

INVENTOR- 4% A TTOR H. W. JACOBS.

BOILER.

APPLIGATION FILED APR.21,1913. 1,093,430. Patented Apr. 14, 1914. a slums-511311154.

i? 57 37 i 57 57 59 204i,

WITNESSES: INVENTOR- wimwwn Q g Q H. W. JACOBS.

BOILER.

APPLICATION FILED APR. 21, 1913.

Patented Apr. 14, 191.4;

6 SHEETS-SHEET a.

INVENTOR.

WITNESSES.-

(was;

inr

BOILER.

Specification of Letters Patent.

Patented Apr. 14L, 1914:.

Application filed April 21, 1913. Serial No. 762,634.

To all whom it may concern:

Be it known that I, Hnxnr W. JACOBS, a citizen of the United States, and resident of Topeka. in the county of Shawnee and State of Kansas, have invented certain new and useful- Improvements in Boilers, of which the following is'a description, reference being had to the accompanying drawings, which form a part of my specification. My invention relates to steam boilers more especially adapted for marine service; having for its object the provision of a boilerwhich will possess greater strength than those heretofore employed, by reason of the fact that the structural material com prisessub-divisions of short transverse sec tions having a shape best suited to with stand the strains to which the same are subjected.

l Another object of my invention is the provision of a construction wherein the possibility of violent explosions will be eliminated, not only due to the greater strength resulting from the peculiar construction just referred to, but also because of the fact that with my improved construction no stay or rivet heads are exposed to the action of the fire or hot gases either on the crown or side sheet of the furnace nor in the com bastion chamber or chambers, as, however, is the case in the ordinary constructions heretofore employed wherein the stay or rivet heads burn off when the same are overheated and thereby allow the sheets to collapse.

A further advantage of my invention lies in-the fact that in case a rupture should occur in any one of the number of sections of which the boiler isconstructed, it cannot spread to the adjacentsection or sections, but on the other hand such break or rupture will be confined to a small space or area and the steam allowed to escape gradually, and therefore without disastrous effects.

' A further object of my invention is to provide a boiler the cost whereof will be materially cheapened as well as the cost of maintenance,because the worlcof repair or replacing' of worn parts will be simplified, owing to the possibility of-producing inter "changeable parts by macl'lineryin large quantities p "Another ob ec t of my invention-1s to proa vide a construction wherein the bad and serious effects due to unequal expansion and contraction of the structural material, re-- sulting from uneven or changing temperatures, will be eliminated, by reason of the flexibility of the construction, attained through the employment of subdivisions or sections of curved cross section, whereby each sectionis allowed to bend or flex without transmitting any great strain to the adjacent sections or parts.

With my improved construction, all stay bolts and rivets are removed from the areas of intense heat,-both in the furnace and combustion cha1nbers,-and all seams are produced in the water-space of the boiler where they are submerged; at the same time, a construction is provided wherein all the parts are easily accessible for removal, in spection, and repairs or replacement; a construction which also results in a low maintenance cost because of the elimination of the bad eiiects due to unequal expansion and stay bolt troubles heretofore encoun tered.

, A further advantage in the employment of my improved construction exists in the fact that a greater firebox volume is produced with the result that better combustion is promoted; a greater percentage of heating surface exposed to the direct ra' diation of heat is obtained, which results in a greater steam capacity. The heating percentage is greatly increased because of the fact that with my improved construction I am enabled to use thinner sheets of material in the walls of the furnace and combustion chambers without, however, sacrificing strength.

My invention results in a construction especially adapted to the application of automatic stokers and automatic ash handling systems, which results in great advantages due to the fact that cheaper fuel may be used, and,thcrefore, fuel and labor cost would be materially reduced, and yet atthe same time obtain av more uniform temperato less hardship, as will be more fully understood from the following detailed description.

In the drawiugs:l igure 1 is a longitudinal sectional view of a double ended boiler equipped with two furnaces at each end thereof; the view being taken on the lines a-a of Figs. 2 and 3, looking in the direction of the arrows. Fig. 2 is a vertical cross sectional view taken on the line b?) of Fig. 1, looking in the direction of the of Fig. 1; the left hand portion of Fig. 5 is a sectional view. taken on the line ee of A open atthe bottom instead of being com- Fig. 4. looking in the direction of the arrows; while the right hand side of Fig. 5 is E "a corresponding flange 13 formed on the boiler heads 14. All of the furnaces A ter- -minate ,,at their'iiinner" endsin combustion chambers B. The combustion chambers B a sectional view taken on the line f-f of Fig. 4, looking in the directionof the an rows.

In the exemplification of I illustrate a double ended boiler? of the dry bottom type, provided with two furnaces at each end thereof; that is, the boiler'may be fired from both ends, and the furnaces are pletely surrounded by a'water-wall or jacket as is the case in the usual well known type of marine boiler. The construction as shown in Figs. 1 to 3, therefore,.contemplates four furnaces as indicated at A; two furnaces being situated at each end of the boiler and arranged side by side, as more clearly shown in Fig. 2. 'The furnaces are formed of channel sections 6 which are' preferably substantially U-shape in cross-section and the sections of approximate U-shape contour, as clearly shown in Fig. 2. The convex surfaces of the sections are presented inwardly, thatais toward the furnace side, so that the flange portions of adjacent sections will be brought substantially parallel to each other -and permit of their being riveted together on the water-side of the boiler.

Before the flange portions of the adjacent sections are secured in place, I insert stay- 5E; tions 6 of the-one furnace to those of the sheets as indicated at 7 between the flan es of adjacent sections and then rivet the adjacent, flanges of the sections and stay-sheets in place,- as clearly indicated at 8. These stay-sheets 7 are so formed as to tie the secadjacent parallelly arranged furnace, at the longitudinal center of the-boiler, as more clearly shown in Fig. 2; and these staysheets also tie the furnace-sections 6 to the outer boiler-shell 9, as clearly shown in Fi 2. I prefer to cut away the stay sheets over the 'top of the furnace A so as to form projeetingreinforcing webs of substantiallythe same contour as the crowns of the fur- 66 naces A, see Fig. 2. The bottom ends of my invention as shown in F igs. 1, 2, and 3, of the drawings,

each of the furnace-sections 6 are flattened as clearly shown at 6*, in order to permit the sections to be riveted to the mud rings 10, while the joints between them are preferably welded.

The outer ends of the furnaces A are closed by the door-sheets 11, see Fig. 1, which are of the same outside contour as the furnace-sections 6. These door-sheets 11 are riveted near their side edges to the flanges of the adjacent furnace-sections with a staysheet 7 interposed, as previously described with reference to the furnace-sections; while the-bottom edges of the door-sheets are riveted to the'mud-rings 10. The doorshcets 11 are provided with door hole flanges as indicated at 12, see Fig. 1, which are secured, in any suitable-manner, as for ex ample by means of patch belts or rivets, to

are also formed of channel sections 15, subjstantially U-shape in cross section, similar to the furnace-sections, with the flanges of the sections extending outwardly and into the waterspace of the boiler. The flanges of-.- the furnace-sections 6 adjacent to the combustion chambers B are of increased di mensions and arranged to extend upwardly so as to form the combustion chamber fluesheets 16, see Fig. 1. The different sections of the combustion chambers are rivetedtogether with the stay-sheets 17 interposed between them, as clearly shown in Figs. land 3. The stay-sheets 17 are so formed as to tie the adjacent parallelly extending combustion chambers B to each other and also tie the combustion chambers to the sides and bottom of the outside boiler-shell 9. j The sides or flan es of the combustion chamber sections 15 adjacent to the inner ends of the furnaces A extend downwardly and form the inner end sheets 18 of the furnaces A; and the bottom ed es of these flanges of sheets 18 are rivete to the mud rings 10 as very clearly shown in Fig. 1.

Interposed between the ends of fur naces A and the combustion chamber B, I place stay-sheets 19 which serve't'oftie the outer sides of the furnace-sections 6 adjacent sides of the sections Sand sectionsl5 to those of the adjacent and 'parallelly arranged furnaces A and combustion chambers B. -The combustion chamber flue sheetslfl are riveted near their top and side edges to the flanges of the adjacent combustioncham- 'ber sections with the, intervening; staysheets 19.

. The stay- sheets 17 and 19 are cutout chambers B; and these webs over the crown of the combustion chambers B soas to form upwardly extending reinforcing webs of substantially the same general. contour as the top of the combustion are provided with; projecting portions or eyes at intervals, to 'whiclrthc removable stays 20 are attached by means of the usual pins and cotters, or any other suitable means. These removable stays 20 serve to support the crowns of the combustion chamber B from theoutside boiler-shell t) as the stays 20 have their upper ends secured by pins and cotters, or any other suitable means, to thereinforcing plates 21; the reinforcing plates 21- being provided with projecting portions atproper intervals to receive the pins where by the stays2O are held in place. The reinforcing plates 21 are secured in place in a manner to be hereinafter set forth.

,The inner ends of the combustion chamhers B are closed by heads 22, which heads are composed of straight channel sections 23. as more clearly shown in Figs. 2 and 3. These channel sections are substantially U- shape in cross section and arranged with their flanges presented ovtwardly, between which arc placed stay-sheets 24; the staysheets and adjacent flanges being riveted together. The slayshccts 24 tie the heads 22 of the oppositely disposed combustion chamhers E8 of the boiler together. The ends of the channel sections 23 are cut oil so as to make the contour of the combustion cham- 'tber heads correspond with the contour of the-combustion chambers B; and the ends ofthe channel sections 23 are flattened out, as clearly shown in the drawings, so as to permit'their being rive ed to the adjacent flange of the combustimi chamber section 15 with an' intcrposed stay-sheet 17.

The flue sheets 16 and the boiler-heads 14 .are'providcd with a predetermined numwhile their tops and side bergof holes to receive the titles 23 which may be welded in place, or secured in any other suitable manner. The lines 2? serve to convey the gases or products of combustion from the .con'ibnstion chambers B to the exteriorof thc boilcr; the fines 25, as clearly shown, being arranged over the tops of the furnaces A.

The boiler-heads 14 are so cut that perin'ieters thereof sidc contour of the the (OI'IGSPOIM to the outad acent ends or sides of the adjacent sections of the outside boil rshell th The bottom edgcs of the boilbrheads 14. arc'rivcted to the mud-rings 10. edges are riveted to the flanges of the adjacent outside sheilsections 26 of which the outsideboiler-shell t) is'compostah The boiler-heads are riveted 'to the adjacent shell-sections 26 with the "well as rclnforcing plates opposite "ends of the boiler are tied or held together by the stay rods 28, which are fastened to the boilerheads 14 by means of the usual nuts and *ashers common to marine practice, or by any other suitable mechanism. The boilerheads 14 are preferably both provided with suitable man hples as indicated at 25), whereby access to the interior of the boiler may be had. The boiler-heads 1-1 are also tied to the door-sheets 11 of the furnaces A by stay-bolts 30, see Fig. 1; and the door-hole flanges 13, provided on the boiler-heads 14, engage with the corresponding flanges 12 formed 011 the furnace door-sheets 11; being secured thereto as previously described by means of the usual patch bolts.

As before stated, the outside boiler-shell 9 consists of a series of channel sections 26 with their sides or flange portions presented outwardly, while the intermediate or inain portions of the sections are curved so as to present the convex side to the outside of the boiler-shell as very clearly shown in Fig. l. The channel sections 26 are so formed that the side edges or flanges will extend outward from the convexcd side of the sections as clearly shown in Fig. 1; and in that respect differing from the formation of the furnace and combustion chamber sections (3 and 15 respectively, where the 95 sides or flange-portions extend-from the conca vcd side of the sections. The sections 2th, are so arranged that the outwardly extending flanges thereof will be ar 'anged parallel with each other so that they may be rivet loo ed together with the stay-sheets 7 inter posed between them as well as the inwardly extending reinforcing plates 27; the latter being inserted between the adjacent sections 26 at a point above the stay-sheets 7 as 105 very clearly shown in Figs. 1 and 2. The reinforcing plates 27 are then preferably welded to the stay-sheets 7 at the point indicated at 31;, see Fig. 2.

The outside boiler-shell sections 32, which 11.0 surround the combustion chambers B, are composed of channel sections, similar in cross-section to the cross-section of the sections 26 except that thesections 32 have a circular contour. These sections 32 1 are secured together in a manner similar to that ofsections. 26, by having the stay-sheets 17, as well as the inwardly extending reinforcing plates-21, interposed, see Fig. 3. The reinforcing plates 21 are 1 inserted between the sections 32 above the stay-sheets 17; and the various sections as well as the stay-sheets 17 and reinforcing and their abutting'ends Welded together at ter they have been placedin position.

In order that the U-shape portions and the circular portions or sections of the outside boiler-shell 9, namely the portions which surround the furnaces and the portions which surround the combustion chambers, may be connected together, I provide the throat-sheets 33. These throat-sheets 33 are preferably formed in two parts, with the upper portion consisting of a semi-circular channel section substantially similar in cross-section to the sections 26 andQ/T. The upper and lower portions of the throatsheets 3.3 are welded together after they have been placed in position. The throatsheets are provided with flanges, one of which is made to conform with the contour of the. adjacent section 26, that is approximately of the U-shape contour of the outside boiler-shell 9, and is riveted to the flange of the adjacent section 26 with the interposed stay-sheets i9 and reinforcing plate 27. The other or opposite flange of both throat-sheets 33 is made,t .eonform with the contour of the adjacent o ilside shell-section 32, that is of circular contour, and is riveted to the flange of the adjacent section 32' through the intervening combustion chamber stay-sheets E24 and reinforcing plate 21.

. The bottom edge or fiange of the throatsheet 33 is riveted to the mud-ring 10, as clearly shown in Fig. l; and stay-bolts 3i tie the throat-sheets 33 to the furnace interior end-sheet 18 which, in the construction illustrated, is formed integral with the combustion chamber section 15 which lies adjacent to the fiu'nace-section 6. In order that the inner end-sheets 18 o the oppositely disposed furnaces A may be maintained against internal pressure and "be prevented from bulging, I provide the stay-rods 3.3 which extend longitudinally of the furnace beneath the. combustion chambers B and have their ends suitably secured toQthe furnace end-sheets 18 of oppositely disposed furnaces A, as clearly shown in Fig. 1. The parts of the boiler-heads it. and the throat-sheets 33 which are not braced by stay-bolts, I reinforce by the additional stay-rods 36, seeFig. 2. which tie the boiler-heads 14 and the throat-sheets 33 to-- gether; the ends of the rods being secured in any suitable manner.

I have. shown and -described a boiler having four furnaces. two of which are located at each end of the boiler, and the furnaces provided with separate combustion chambers; the invention, however, permits of a variety of modified forms; as for example,

the. invention may be applied to either 1 single or double ended boiler having one or -1norc furnaces at each end; furthermore each furnace may have a separate combustion chamber, or two or more furnaces at one end of the holler. may open into. a common combustion chamber; or two or more furnaces situated at opposite ends of the boiler may open into a common combustion chamber.

In Figs. 4 and 5, I illustrate a modified form of my invention, the figures disclosing a single ended dry bottom boiler provided with a single furnace. The construction portions-of the various sections are presented outwardly so as to permit of their being secured or riveted together outside of the furnace so as to come in the water-portion of the boiler. Before the various sections are riveted together, I prefer to insert staysheets 7", so arranged as to extend somewhat beyond the cdges of the flange portions. These stay-sheets are cut away over the top of the furnace C so as to form upwardly extending reinforcing webs which are preferabl provided at intervals with eves whereby removable stays 37 may be at-- tachcd thereto by means of pins and cotters, or in an y other suitable manner. The

.rcnn 'able stays 37 serve to support the crown of the furnace C, as the other ends of the stays are attached by'pins and cotters, or in any other suitable manner, to eyes or outside boiler-shell 39.

The stay-sheets 7 5 at the sides of the furnacecare cut out at intervals so as to allow for the horizontal circulation of the water.

Intermediate of the cut-out portions. I preferably provide the stay-sheets 7 with oval heads on their outer edges whichare adapted to fit into corres1uuuling sockets-cut into the T-irons l0. (see-Fig. 5), which are riv eted to the outside boiler-shell. v

The outer end of the furnace C is closed by a door-sheet 11, see Fig. "i, which is'given the same contour as the furnace-sections 6. The door-sheet ll is riveted at its top and side edges to the flange of the adjacent furnace-section (1" with an interposed staysheet 7: while the bottom edge of the door sheetjs riveted to the mud-ring 10; and the sheet 11 is provided with a door-hole flange 12. The inner end of the fin-mice C terll'lllliltfltlfl a combustion chamber D which is composed .of channel sections 15. These channel sections are substantially, Ushape 1n cross section and of curvilinear contour a members which are shown riveted to the veryclearly shown in'Fig. 5. The flange the furnzwe-section 6 adjacent to the combastion chamber D is formed so as" to xtend upwardly and provide the fiue-sheet 1t) adjacent to the furnace G, extends downwardly and forms the inner end-sheet 18 '-of the furnace, and this inner end-sheet is riveted to the mud-ring 10 located adjacent thereto.

h'stay-slieet 19 is inserted at the juncture of the furnace C and the combustion chamber D, that is intermediate of the flanges of the adjacent sections, and the .stay-sheet, together with the combustion between the sections as to form outwardly extendmg 'webs on the combustlon chamber chamber flue-sheet 16. is then riveted to the adjacent combustion chamber section 15 along its top and side edges. The furnace inuer-end sheet 18 is riveted along its side edges to the flange of the adjacent furnacesections 6 with the stay-sheet 19 interpcsed between; and that part of the staysheet 19 which isriveted between the furnace inner-end sheet 18 and the adjacent furnace section 6 is made to conform with the corresponding part 'of the stay-sheet? at the sides of the furnace C; while the part that is riveted between the combustion chamand forms a projecting reinforcing web which is provided with protrusions or eyes to which the removable stays 20 are secured. The combustion chamber sections 15 have their adjacent flanges riveted together with interposed reinforcing plates 41 between, which are given the same general contour as the combustion chamber sections 15. These reinforcing plates 41 are so secured D; and the plates are provided. with eyes at proper intervals to which the removable stays 20 are secured whereby the combustion chamber D is supported from the outside boiler-shell 39; the stays being attached in any suitable manner as for example by pins and cotters. The opposite ends of the removable stays 20 are secured in a similar mannerto eyes42 which are riveted to the outside boiler-shell 39.

The rear end of the combustion chamber 1); that is the end opposite to the furnace opening, is closed by a head 22? which is composed of straight channel sections 23 "'"as more clearly seen 111 Fig. 5; the channel sections 23 being substantially U-shape in cross-section, with their convex sides presented inwardly; while the flanges of the respective sections *are riveted together with stay-sheets 24: interposed between them.

The stay-sheets 24; are provided at their outer edges-with heads of oval cross-section,

and are cut away at intervals'to allow for the horizontal circulation of the water. The

heads of the staysheets 24 are held in cor- .ter are ,rivetedto the boiler-head 44. At

combustion chamber section 15 with an. in

tervening reinforcing plate it. e

The flue-sl1eet 16, as well :is the back boiler-head 45, are provided with suitable holes to receive the ends of the has 25, which are preferably welded in place. The flues, as clearly shown in the drawings, extend over the top of the furnace C and serve to carry the gases or products of combustion. from the combustion chamber D to the exterior of the boiler. The back boiler-head 45 is cut and flanged to conform \vith'the contour of that part of the outside boilershell 39 surrounding the furnace C, and the head 45 is riveted to the outside shell along its top and side edges, while the bottom edge bolts. The back boiler-head 45 is tied to the furnace door-sheet 11 by staydoolts 30. The back boiler-head 4-5 is also tied to the front boiler-head 44 by stay-rods 28 which are secured by means of the usual nut and washer. common in marine practice, or in any other suitable manner.

The outside boiler-shell 39, in'thc construction shown in Figs. 4 and 5, is preferably composed of dilferent parts; with the upper or crown portion 39 preferably made semi-cylindrical and extending the'full length of the boiler, and the. ends thereof riveted to the b-oilcnheads 44 and 45 as clearly shown in Fig. 4; while the side portions 39, of the outside boiler-shell, and which inclose the sides of thc'furnace .C, are preferably composed of fiat sheets riveted at their bottom edges to the mud-rings 10; their upper edges being riveted to the upper: or crown portion of the boiler-shell.

. plate'46, thus providing a horizontally disposed web or rib. The edges of the side portions 39 are riveted to the back boilerhead 45, While the opposite edges are riveted to the throat-sheet 33.

In order that the flat portion of the side sheets 39* above the stay-sheets 7-of the furnace may be braced against internal pressure, I provide bracing means preferably inithe form of T-irons 17, see Fig. 5, which re riveted to the inside of the side. sheets and have removable stays at} secured thereto by pins and cotters, or any other suitable means; while the other ends of the stays ,48 are secured in a similar man- I may be braced and firmly secured in place,

I provide the stay-bolts 34 which are secured to the throat-sheet and to the inner end furnace-sheet 18. ing about the bottom half of the comb'ustion chamber D is preferably semi-circular in cross-section and is riveted by means of outwardly extending flanges, with the interposed reinforcing plate 46, to the corresponding flanges on the crown-sheet 39 of the outside boiler-shell. The furnace innerend sheet 18, which is not braced by the stay-bolts 34, is preferably tied to the outside shell-sheet 49 by stay-rods 50, secured at their ends in any well known manner; and the parts of the front boiler-head 44,

' not stayed by the combustion head stays 24,

are braced to the outside shell-sheet 49 by the stay-rods 51, see Fig. 4.

The boiler-heads are shown provided with man-holes 52 whereby access to the interior of the boiler may be readily had.

From the drawings and foregoing description, it is apparent that the method of construction illustrated in Figs. 4 and 5 possesses an advantage in that the outside boiler-shell can be. easily removed for inspection and repairs or replacement, as the crown-sheet 39 can be readily removed by driving out the rivets in the longitudinal flanges at the sides of the boiler,-and which extend through the horizontally disposed reinforcing web or plate 46, and the rivets which secure the crown-sheet to the boiler- heads 44 and 45, and then disconnecting the removable stays 37 and 20 The same is true with reference to the inclosing sheet 49 secured about the lower half of the combustion chamber D, as by removing the rivets in the joints between the sheet 49 and the crown-sheet 39*, removing the rivets connecting the sheet 49 to the front boilerhead 44 and to the throat-sheet33, will permit the stay- rods 50 and 51 to be disconnected and thereby give access to this part of the boiler. I outside boiler-shell can be readily removed bydriving out the rivets along their edges, disconnecting the stays 48, after which the side sheets39 need only belifted up or down slightly to release the oval heads on The sheet 49 extend-' The side sheets 39*" of the the stay-sheets 7 a from the sockets formed in the T-irons 40; which will permit the sheets to be removed from the boiler, -The front boiler-head 44 can readily be removed in the same manner after having-been disconnected from the outside boiler-shell 39, and either "the crown-sheet 39 orthe lower sheet 49 having been removed from the boiler, so as to allow the boiler-head to be moved vertically and permit the releasing of the heads of the combustion chamber head stay-sheets $34 from their sockets in the T-irons 43.

This method will allow these parts to be removed without destroying their respective stay members. The back boiler-head 45, as well as the throat-sheet 33, are removed in the usual way by driving out the rivets, cutting out the stay bolts, and disconnecting the respective stay-rods.

Theconstruction as shown in Figs.'4 and 5, like the construction shown in the preceding figures, permits of a variety of modifications in the arrangement of the furnaces and combustion chambers without, however, departing-from the principle of my invention. For example, the construction may be made either as a single or a double ended boil'er having one or more furnaces at each end; each furnace may be equipped with a separate combustion chamber, or two ,or more furnaces at the same end of the boiler may have a common combustion chamber; or two or more furnaces at opposite ends of the boiler may have a common combustion chamber.

In operation, the flames and products'of combustion pass from the furnaces A and C, in the constructions shown in Figs. 1 and 4, to the combustion chambers B andfD respectively, and from there they are conveyed by the fiues 25 and 25*, respectively, to the exterior of the boiler through the boilerheads 14 and 45 respectively, to which hoods or uptakes are attached whereby the smoke is conveyed to the smoke stack. a

:I have shown and described What I believe to be the best forms of my invention; but as previously stated, the same may be modified in certain respects Without, however, departing from the spirit of my invention, and I do not wish to. be understood,

therefore, as limiting myself to the exact constructions shown.

What I claim is 1. In a boiler of the class described, a furchamber being eloi'igated upwardly to constitute an integralflue sheet and secured to the flange of the adjacent combustion cham ber' section on the water side of the boiler.

2. A boiler, composed of one or more fire-- nace section adjacent to the combustion j boxes and oue'or more.combustion chambers K arranged at opposite ends of the boilerjwith the combustionchambers arranged adjacent to the vertical center line bf the boiler, the tire-boxes and combustion chambers being, composerbot' sections substantially U-shape in cross section, having their flange portions 'irescnted outwardly, with the flange portions of the adjacentfire-box sections and combustion chamber sections elongated upwardly and downwardly, respectively, so as to provide integral flue sheets and tire-box inner end sheets adapted to be secured to the adjacent flanges on the water side of the boiler.

3. A dry bottom boiler of the class described, the furnace portion and combustion chamber portion being composed of channel sections substantially U-shape in cross sec: tion, the furnace portion beingof approxi mate U-shape contour, the flange of'the furnace' section adjacent to the combustion prising furnace portions and combustion chamber portions arranged on opposite sides of the vertical center line and longitudinal center line of the boiler, the furnace and "combustion chamber portions beingcom- 40 posed of subdivisionssubstantially U-shapc in cross sectlon with their ad acent sides or flange portions presented outwardly and secured together, the flange portions of the furnace sections adjacent to the combustion chamber portions being presented upwardly to constitute combustion chamber flue sheet-s,

while the combustion chamber section flanges adjacent to the furnace portions arepre sented downwardly to constitute furnace inner end sheets, the inner endsof-the combustion chamber portions being provided with heads composed of channel sections having their flanges presented outwardly, and stay sheets intermediate of the sections composing the adjacent walls of furnaces are ranged at the same end of the boiler and between the sections of oppositely disposed combustion chambers whereby the adjacent walls-of. the furnaces and of the combustion chambers are secured together,

A boiler of the class described, provided with two furnaces at each end thereof and with combustion chambers intermediate of the inner ends of the furnaces, the furnaces and combustion chambers being composed of sectionssubstantially U-shape in cross section. with the flanges of'the fire-box sect-ions "adjacent to the combustion chainhers being extended upwardly to constitute flue sheets integral with said fire-box sec-' tions, all of the sections being secured together on the Water side of the boiler, and stay sheets secured intermediate of the sections of the different furnaces and combustion chambers whereby the sections are reinforced, with the stay sheets intermediate of the sections of the furnaces arranged at the same end of the boiler being adapted to tie the sections of the parallelly arranged furnaces together and provide an intervening water leg.

A boiler of the class described, comprising a furnace portion and a combustion chamber portion. the fnrnace'and combustionchambeiportions being composed. of sections of curved .cross section with the sides or flange portions of the different sections being presented outwardly. stay sheets secured intermediate of the flange portions or sides of the differentsections whereby the furnace and combustion chamber portions are reinforced. the stay sheets being cut away to conform to the contour-of the crowns of the furnace and combustion chamher and permit of free water circulation and to provide projections or eyes at spaced points or intervals, stays removably secured to said projections or eyes and to the outer boiler shell whereby the furnace and com bustion chamber are supported, the inner end of the combustion chamber portion being provided with a head composed of channel sections substantially Ushape in cross section having their sides or flanges presented outwardly. reinforcing members secured intermediate of the sections constituting the head of the combustion chamber whereby said sections are secured to the outer boiler shell, and stay rods intermediate of the boiler-heads at opposite ends of the boiler whereby the boiler-heads are tied to gather.

7. A boiler of the class described wherein the fines extend above the crown of the fircof the fire-box section adjacent to the combustion chamber being extended upwardly to provide a flue sheet integral with the firebox section, and the inner end of the combustion chamber is provided with a head composed of channel sections substantially U- shape in cross section, the flanges of all the sections beingpresented outwardly and secured together on the water side of the boiler.

8. A boiler wherein the fire-box and combustion chamber are composed of sections substantially U-shape in cross section, with their flanges presented outwardly, the

flanges of the adjacent fire-box and combus tion'chamber sections being elongated in an upward and a downward mannen-respectively, to provide aflue sheet integral with,

combustion chamber provided with a head I com'posed'of' channel sections substantially 'U-shape in cross section,

with the flanges of all the sections presented outwardly andsecured together on the water side of the boiler.

10. In a ,dry bottom boiler of the class described, provided witli one or more fireboxes at opposite ends of the boiler, and one or more combustion chambers intermediate of the opposing ends of the fire-boxes, with the fire-boxes and combustion chambers composed of channel sections having their flanges presented outwardly and secured to-.

gether on the water side of the boiler, the flan e of the fire-box section adjacent to the com ustion chamber being elongated upwardlyto constitute an integral flue sheet for the combustion chamber, While the flange of the combustion chamber section'adjacent to the fire-box is elongated downwardly to constitute an inner end. sheet, the combustion chambers being provided with heads composed of channel sections having their flanges presented outwardly and secured together on the water side of the boiler, reinforcing members intermediate of all of the sections whereby the fire-box and combustion chamber sections are supported from the outer boiler shell and intervening Water spaces provided, With the portion of said outer chamber made in two semi-circular portions provided with abutting ends adaptedto be secured together.

Witnesses:

GEORGE HEIDMAN, R. E. -WIGI-ITON.

shell surrounding the combustion HENRY W. JACOBS.

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