US2006775A - Locomotive stoker - Google Patents

Description

July 2, 1935. F. c. PICKARD LOCOMOTIVE STOKER 3 Sheets-Sheet l Original Filed Oct. 2', 1928 Y ATTORNEY July 2, 1935. F C, plcKARD v 2,006,775

LOCOMOTIVE S TOKER Original Filed Oct. 2, 192B 3 Sheets-Sheet 2 IN VEN TOR BY fran# Cf PJaa/d A TT ORNE Y F. C. PICKARD July 2, 1935.

LOCOMOTIVE STOKER Original Filed Oct.v 2, 1928 3 Sheets-Shea I N VEN TOR fa/12 P/'aa/d @M e7 ATTORNEY Patented July 2, 1935 v UNITED STATES PATENT i OFFICE LOCOMOTIVE STOKER Frank C. Pickard, Erie, Pa., assignor to The Standard Stoker Company, Incorporated, a corporation of Delaware Application October 2, 1928, Serial No. 309,856

Renewed January 10, 1935 19 Claims. (Cl. 110-101) The present invention relates to Stoker appanot fill the entire. fire door openingvbut leaves ratus in general and specifically to the class of a space above which is ordinarily closed by a stokers that are particularly adapted for use removable cover but which affords facilities for with locomotive engines. hand stoking and access to the firel box-Without 5 The general object of the invention is to prodisplacing the discharge box. V5

vide a new and improved Stoker of the character The discharge box terminates outside the'locospecified by improving the conduit or conveyor motive boiler and arranged in register with-the system of the Stoker, its fuel feeding system and lower side of the mouth of said discharge box also its distributor system. and extending through the fire opening into the l Specific objects of the invention are toprofirebox of theA boiler is a distributor plate which 10 vide a novel form of intermediate conveyor elehas one or more air passages at its under side to ment or housing whereby the passage of the promote cooling of its floor. The inner end por'- fuel therethrough under the action of the feedtions of the plate within the firebox are formed ing means is greatly facilitated and improved at'the sides with depressions or guide pockets M l and t0 DlOVide a new and improvedforrn Of riser which facilitate sidewise distribution of the fuel 15 or discharge box, together with certain adjuncts While leaving a wide space on the floor or bottom thereto. of the plate for direct action from the uid 'jets To the above and other ends which will subseof the distributor system. quently appear, the invention consists in the The fuel distributing jets of this invention 'are features of construction, combinations of devices emittedfrom a distributor head or nozzle which 20 and arrangements of parts, hereinafter described is in the form ofl a plate-like element disposed 3S SSDGCiaUy applicable to stokers for locomotive betweeny the rear of the distributor Vplate and boilers, but it will be understood that its use is the mouth portion of the discharge'box. nOif COIlned t0 any One type 0f IBbOX 01 boiler; The, construction of the Stoker apparatus of the claims. pact one, the fuel from the tender falling into In carrying out the invention in the present the open trough portion of the conveying system instance, there is provided a novel conduit or from which it is fed forwardly through a crush- Conveyor section or housing intermediate the 'ing member which acts upon the larger lumps open trough which is Supported on the locomotive of fuelforushing them to smaller and more suit- 30 tender and the riser or discharge box on the locoable sizes for delivery to the rebox. The fuel motive, said intermediate section or housing hav- Vafi-,er passing through the crusher is conveyed ine a curved or arcuate bottom and vertically forwardly by the intermediate portion of the conjdiSpOSed Sidesy ihuS giVing it a U-Shafpe- Prefelveying system, the D-shape of which allows the ably, however, the top of the Section is Covered fuel to be advanced therethrough without lfurther 35 so that ordinarily it is referred to as a D-shaped materially breaking it down or pulverizing it,l and housing and forms an upturned D-Shaped fue1 delivers the fuel to the lower portion of theV riser PaSSag@ thlOughOu its lengih- Within ihS hOuS- or discharge box, which as previously stated-coning is a feed screw whose spiral flights or threads forms in shape with the D-shaped fuel passage conform in curvature with the curved bottom of of the intermediate conduit, Said D-shape of the 40 the housing, and it 1125 been fOund in lJIaCiCe discharge box preventing rotation of the fuel as it that as a result of this arrangement there is litbegins t0 rise therein. The column of fuel rising tie, if any, IOaiiin 0f the fuel With the SCllW, in the discharge box maintains substantiallythe herefOre the adVanCe 01 feeding 0f the fuel same vertical and longitudinal cross sectional i5 through the hOuSing WithOuil breaking up 01' area throughout, whereas the gradual flaring 45 powdelng is much improved over prior oonshape of the discharge box, increasing'in varea S'-IuCiiOn. Y toward its oblong mouth portion permits thefuel Connected With the D-Shaped hOuSng O1 COnto spread out laterally, thereby reducingV the vevor section at its forward end is a riser or dispossibility of rotation of the fuel and of crushing charge box which expands or flares as it rises. it in its travel therethrough.k Y 50 The lower end of the discharge box conforms in The rearwall of the discharge box or the cover Shape With the COnVeyor section aforesaid and forming the hood portion thereof extends upward at its upper end said box terminates in a mouth above the distributor plate ina substantially conwhich is substantially oblong in shape orlike a tinuous line with its lower portion, a distance rectangle with rounded corners. This mouth does sufficient to permit the angularly advancing Cal and the inVBntiOn iS DartiulS/Tiy DOinied Out in this invention is a particularly efficient and com- 25 shewin'g'the'discharge'box.with its cover removedV column/of fuel to rise to a height above the distrlbuting plate, Without pulverizingV pressure beingexerted upon it, so that the action of gravity Wlllbreak the columnar formation of the fuel and place the lower and forward edge of the sloping fuel face forward of the distributor head or nozzle.V

The jets issuing from ,the head will act upon the fuel toproject'it over the distributing plate into the rebox, thus assisting the action of Vgravity in breaking the fuel column and creating a more or less fixed angle of repose of the fuel dependent feeding and distribution of the fuel; and the in vention will be hereinafter described more in de- ;tnil in Aconnection 4:with the accompanying draw*- ings, Ilm-which ,v

'1 :is f a 'fragmentary vertical. Alongitudinal :Mammal VView :showing `portions of the *locomotive with its re'box and tenderrwith the invention appliedjthereto; Y Fig. -2 is 'a vertical sectional view taken on a -plsnejindicated by the section line 2-2 in Fig. 1 and-looking lin the direction of the arrows at laidfline; Y

Fig.- il is a plan -view of certain of the parts in Fig. 1 Vtogether lwith the actuating moans for thefuel `feeding system; v .-PlgAfis 'an enlarged Vfragmentary plan view `of of theparts showninFg. v3; e yli'ig;Y fis an ,enlarged `yfragmentary. VplanV view so as more clearly Vto illustrated Ythe underlying vfiseanenlarged fragmentary vertical secstional VView of the forward portion of the :conyeyorsystem including the. discharge box, to'- gether with fthe distributorplate and distributor heed; f Y

'-7 is atransverse #fzlfft'slGrand Y 8 isav'similar section takenY on the line of Fig. 6. Y I Referringrst to FiguresH 1 and 3, `the locomoltive'iramerls-indicatedgenerally at wand the locomotive tender at Il, the tender and locomoifvevbeing coupled bya coupling l2. The locosectionftaken on the line .mtive-supportsa-boiler comprising a'rearwater .l Wal1|3` provided with a vfire Vdoor 'openirg -Hfintothe firebox I5 at the lower part `19t-'Which Yiswiisposed a grate YHi. -The floor or theglocomotiveisdndicated at i1 and thejporrof-the -fuelbin i8 on the tender at i9,

oor as usualfbeing vin rthe form-of adjustabiefsections'to' alfordradmission of the'coal or other-inclut desired points tothe rear lportion fuel conduit system. Y

' `The-rearipor-tionoi Asaid system comprisesan openfmouthedtrough 20 supported on the tender tI-and horizontally disposed, this vtrough being -by -a-universal -joint .indicated gener# .fallyya't l,212| with/the rearpart122 of aninter- Ainsediate, conduit section or housing. Said housing 'or oonduitsection risrpreferably lin -two parts, "the front part 23 being slightly smaller in cross section-#and ttinginto the'part 22 fso as to profvide--artelesoopi joint toallowfor longitudinal adjustments@ The front portion of `the housing partfa-isconnected `by a' universal joint 24 with -the lower' end fofa riser or discharge-box.25

which extends or lcurves upward and inclines forward, terminating in a mouth portion 26 whichv is approximately' horizontally disposed and opposite the lower portion of the re openingri, its outer face being just outside the back walll. Above the mouth 26 and closing the upper part of the fire opening is a conventional removable cover 2-1 which affords accessto the interior of Vthe vrebox independently ofthe dis.

charge box.j V A .As will be seen more particularly from Figure 2,the intermediate conduit section or housing is of novel shape, this statement applying 'both to the inner and-* outer sections 22 and 23. The bottom portions of the .sections as indicated cal. The tops of the sides are joined by tops or cover portions 22c and 23C.

at 22a, 23 are curved'or arcuate while the sides V22b and 2,3b` are substantially parallel and verti tion of Figures 2, 4-6,.the"lower'part of the'A dis- Acharge box 25 where it is connected to rthe forward housing part 23 v,conforms in shape to said housing part. The rear wall andthe forward wall of said box or riser aresubstantially 'parallel but the side walls expand or spreadA outward laterally and the top portionA or mouth 26V is substantially oblong or-,like a rectangle'but with arcuate corners. It, will be noted that while the trough 20 is horizontally disposed, the housing 22, 23 inclines somewhat upwardvfrom its Vrear towards its front while the discharge vbox rises somewhat more abruptly forming an e1- bow of more than 90 with the housing, said discharge box .as it rises also inclining forward and its top curving over :so 4that the mouth portion 26 is substantiallyy horizontal and 'in register with thevfre opening I4 at its lower side. The trough andthe housing `are disposed below the Vfloors of the tenderand` the locomotive while the discharge boxonriser passes upward through anfopening indicated motive deck l'l. i Y.

The fuel feeding system comprises two conveyorscrew sections 28 and.29 jointed at 30. .The section 28 is disposed within the trough 20 which at its forward end breaker 3|. Y

'The screw section 29 is arranged within the housing 22, 23 and terminates atthe lower end of the dischargeY box 25. The screw feeding elements Y28 and 29 receive rotary movements'for feeding the fuel `through theconduit system by anyA suitable means, the 'means shown ,herein comprising a spur gear 32 operatively. connected tothe rcar end ofthescrew section 2li and interion is connected to a driving motor 3d, ,preferat I'la in the ilocomay be provided with a-fuel Y ably `mountedfon the tender, V`by connecting means comprising -jcinted shaft sections 35,36 and 3,1. screw feeding elements will be rotated Vtoffed the fuel forward through the trough-20 and the conveyor section vor housing 22, 23 and thence upwardthrough theriser l25 into the control'of ,the fuel distributing means Vhereinafter de-V scribed.

In practice -itV has vbeen yfound by Vemploying my novel form-of intermediate conduit that the 1 tendency of the fuel to rotate with vthe screw as occurs in ,prior construction has been'subj stantially overcome, the-fuelbeing advanced in vthe conduit readily by'rthe 'fuel Vfeeding device 2S and the -D-shape ofthe conduit overcoming any tendencyiof some rfuel to :churn ground and Under `operation of 'the motor 34 the( round within the housing without being advanced or fed by the screw. Such churning would not only interfere withv the feed but also would tend to break up and more or less pulverize or powder the coal and thus increase the boiler stack loss.

It will be observed that there are spaces, indicated at s (Fig. 2), between the perimeter of the threads of the screw 29 and the side walls of the conduit section, which spaces afford room for exfpansion, so to speak, of the fuel as it is moved upward in the conduit by the screw action. In other words, these spaces allow the fuel to spread and prevent its packing so that it may fall or pass readily into the control of the screw threads as they turn, promoting the feeding or advance movements of the fuel and preventing it from merely churning round with the screw without advancing.

Corresponding advantages result in a more or less degree from the shaping of the riser into the form described.

'I'he upper part of the riser in the vicinity of the mouth is of considerably greater width than the lower part, however, and this affords opportunty for control of the distribution of the fuel as it is advanced upward through the riser byk the action of the feeding system..v

In order to control and regulate the advance of the fuel at the opposite sides of the riser, controlling means are employed presently to be described.

In order to afford ready access to the interior of the riser or discharge box, there is provided at its upper side a movable cover plate :i8 which is preferably dome-shaped or bulged as will clearly appear from Figure 6. Said plate is movable relatively to the riser and is hinged thereto as at l39. That part of the riser carrying the hinge is made as a detachable cover 55u and is fastened to the main body of the riser by means such as the tap bolts indicated at 35h in Figure l. The detachable cover 38a is recessed as at 38e to receive the movable cover plate 38.

The movable cover plate 38 is interloolied with the riser by means of thumb nuts or locking devices 40 cooperating with screws 4I extending outward from the riser and passing through open mouthed slots in the cover plate. .This cover plate 38 and the detachable cover 32m form in effect the upper part or top of the riserand constitutey the upper part of its mouth portion 26.

For the'purpose of controlling and regulating the rising column of fuel at the two sides of the.

riser 25, a device is provided comprising a guiding device or vane 42 arranged within the riser near its upper side, said vane being mounted on a stub shaft 43 which bears in an enlargement 3Ba on the movable cover 38 of the riser. The outer end of the stub shaft carries a handle 44 by which the vane may be adjusted; and disposed between the handle and the enlargement 33e is a locking device 45 comprised in means for holding the shaft and so fixing the vane 42 in adjusted or set positions. It will be seen that by varying the position of the vane the rising column of fuel may be turned partly to one side or the other of the upper part of riser 25. Above the guiding or directing device 42 there-is provided on the cover 38 a pair of parallel transverse trackways 45 which receive a pair of slide plates 4i,

each formed with a plurality of holes or ports` indicated at 48 (Figs. 4 and 6). The slide plates may be controlled by a stoking baror otherirnplement 'applied to lugs 49 extending upward from the end portions of the Yplates and enabling them to be pushed in and out in their tracks so that the holes or ports 48 may be brought fully into register with, or more or less caused to cover underlying holes or ports indicated at 50 in the cover 38. Y

The construction is such that adjustable air passage-ways are provided through the top portion of the mouth or the upper end of the riser, affording a draft of air passing inward towards the rebox and adapted to carry inward the top portion of the fuel in the riser with which the air current coacts. The air controlling devices comprising the ported slide plates 41 are preferably arranged in line with the angle of 'repose of the fuel Vat the top of the riser. In conjunction with the vane 42, the independently adjustable slide plates afford means for regulating the feeding of the fuel at opposite sides of the wide or flared portion of the riser so that it may be fed as desired into the Ycontrol of the distributing means.

The fuel distributing means comprises a distributor plate connected at 52 at its rear side portions to the lower part of the riser 25, the distributor plate extending horizontally inward from outside the riser to within the firebox through the rebox openingV i4 and the floor of the plate being substantially in line with the lower side of the mouth of the riser. The plate 5| may be a unitary casting and is preferably formed with one or more air passages 53 extending inward just beneath the floor so as to afford more or less of a cooling effect thereon. The passages have mouths or communications indicated at 54 with the outside air; and a lip 55 prevents the air from passing between the under side of the plate and the bottom or lower side |4e of the nre opening I4.

An adjustable abutment in the form of a screw 56 is threaded up centrally into the under side of the distributor plate 5|, the head of said screw resting on the bottom |4a of the fire opening, theY construction being such that adjustability of the plate 5| is thereby afforded. y

At its forward o1' inside portion `within the firebox the plate 5| is provided with outwardly ilaring depressions or pockets indicated at 5T assistingl the sidewise distribution of the fuel as it passes inward over the plate 5|. It will be seen particularly from Figure 5 that the pockets are so spaced as to afford a wide unobstructed flat surface indicated at 5|e on the floor of the plate The fuel distributing means further comprise a distributor head affording a particularly compact and efficient arrangement. Said head is in the form of a plate-like member 58 which is vertically disposed in an opening or space indicated at 58a between the distributor plate 5| and the lower side cf the riser 25. The member 58 as will be seen from Figure 6 extends upward slightly above the floor of the plate 5| and is curved or rounded at its rear side so as to lessen interference with the advance of the fuel. f

rI-*he member 58 is provided with a plurality of vertical passage-ways indicated at 59 and connected at their lower ends with pipes 65 leading from fluid pressure means of suitable construction and which being in common use have not beenr further illustrated herein. The passage-ways 59 extend upward above the floor of theplate 5l. The inner face of the member 58 is provided with a horizontal series of small holes or'jet openings indicated at 6 l, a plurality of said openings communicating with each of the fluid passage-ways 59 andthe outer openings preferably diverging.-

It will beseen thatV the jet openings 6l are so disposed that vthe 'fluid jets passing-therethrough act directly on and in line withv the fuel receivedv on the distributing plate Stand so as to obtain the most `direct andbenecial results in sweeping' and distributing it forward through the firebox opening over the fuel bed on theV grate I6. The jet actionv isi effective Yto blowY the fuel forward 'and also laterally over the iioor of thedistributor plate into Vthe rebox, the wide space 51| facilitating i evenfandieiectivc distribution while the guide pockets assist in the side distribution of the iuelY over the iirebed'.V l

I claim:

1. In a stoker for a boiler having Va firebox including an upstanding wall with a firing opening therein, a conduitY extending between the source of fuel supply and the frebox ofthe boiler, said conduitincluding an intermediate Vsection having a curved bottom, substantially vertical sidesl and an .approximately horizontally disposed `top throughoutY its length; and an upwardly extendingdischarge box connected to said section and leading'therefrom to the firing opening, the lower portion offsaid box conforming with the shape of said intermediate section, said discharge box flaring or expanding as it extends upward and its mouth portion ordelivery end at the firing opensof:

ing ofthe rebox being substantially oblong in shape and a screw conveyor in the intermediate section terminating at its deliveryend adjacent.

the lower portionof said discharge box.

2. Ina stoker for a boiler having a rebox including an upstanding wall with a firing-opening therein, a conduit extending between the source of fuel supply and the rebox of the boiler, said conduit including an intermediate section hav-l ing a curved bottom,'substantia.lly Vertical sides andan approximately horizontally disposed top forming an upturned'v D-shaped fuel passage Vthroughout its length; and an upwardly and for-A wardly extending discharge box connected tok said` section and leading therefrom to the firing opening,=the lower portion; of said box conforming with the, shape of said section, the rear wall and theforward wall of said discharge box being substantially parallel and the sidewalls diverging as they extend upward; the mouth portion or delivery end of said discharge box at the firing opening'of the rebox being 'substantiallyv oblong in shawn-:md a screw conveyor in the Vintermediate section Vterminating at its delivery endVV adjacent Vthe lower portion of said discharge box.

i fuel from the riser.

3. ,Ina stoker for a boiler having a rebox including anupstanding wall with a ring opening therein, the combination of ya conduit system exofthe boiler, said system including a. riser conduit extending upward outside the rebox and communicating with said firing opening, and a sectional cover on the riser conduit including a hinged central section provided with an adjustable air opening, said air opening being substantially in the line of the angle'of discharge of the 4.v In a stoker fora boiler having a firebox including anupstanding wall with a firing opening therein, the combination.Y of a conduit system extending betweenthe fuel supply and the rebox of the boiler, said system including a riser conduit extending upward outside the rebox and communicating With'saidA firing opening, a sectional cover on the riser conduit includingY a. hinged central section provided withL an adjustable airv amooz'ze'z ,Y Y

opening, andan adjustable guide vane` disposed'y within the riser conduit adjacentthe-air opening.

5. In a. Stoker, a riser conduit, a sectional cover on the riser conduit4 including a .hinged central section provided with adjustable air openingsand air admission means including a kplurality of'V perforated plates slidably supported-fatfthe upper portion of said central Section.

6. In a stoker, a. riser conduit; a movable cover,

on the riser; air admission means including a plurality of perforated plates slidably supported unV o'n the riser; and a guide vane in said riser ad-` justable at will to guide the rising fuel in advance of Vaction thereon by-said air admission means. f

7. In a stoker for a boiler having a. flrebox Vincluding an upstanding -wall with a fringopening therein, the combination of ajconduit system extending between-the fuel supply and .the rebox of the boiler, said system including aconduit section andan expanding riser terminating/ina comparatively wide mouth; means for feeding fuel through the section and upward through the riser; and means for regulating the amount of the advancing column 'of fuel delivered along either Vside of the expanded portion ofthe" riser, -said.

means comprising a guide within the riser, anda pairof independent devices for icontrollingthe admission ofv air to the upper side portions of the riser.

a conduit system including a. conveyor conduit and:

8. The combination with a 'rebox havingan. upstanding wall with a firing opening therein, of

a riser conduit connected thereto adapted-for delivery of a column of `fuel'tosadnring opening,A

a screw conveyor in said fconveyorconduit terminating at its delivery endadjacent the lowerr portion of said riser conduit, thegconvc-ryorA conduitv having a curved bottom, substantially vertical sides and a horizontally disposed top forming an upturned- D-shaped l:tuel passage 'substantially' throughout its lengthV andthe lower portion of said riser conduit conforming with the shape ofr said conveyor conduit, the rear wall and the forward `wall of said riser ccnduit being'fsubstan# tially parallel and the sidewalls rdiverging as they i,

extend upward, and the mouth portion or 'delivery end of said riser conduit adjacent the firing opening of the firebox being substantially obllmgjln 9. In a conveyor system, the combination of a conduitincluding a conveyor conduit portion andY a riser conduit portion and a screwconveyo'r'in said conveyor conduit portion, the delivery end of said screw terminating adjacent thejunction of the aforesaid conduit portions and acting to force material through the riser portion, the conveyor conduit portion having a curved bottom, substantiallyvertical sides and a. horizontally disposed top forming anlupturned IDL-shaped passage substantially throughout its length and the lower part of saidfriser conduit portion conforming with the shape of said conveyor conduit portion, the

rear Wall and the forward Wall of said riser'con-.

duit portion being substantially parallel and the side walls divergingV as they extend upward,` and the mouth or delivery` end of said riserconduit portion beingr substantially oblong .in'shapa 10. In a stoker, a discharge conduit, a, detachable cover on the discharge conduit having a recess therein, a movable cover mounted in and closing said recess and beinghinged torA the first named cover, and said movable coverprovided Vwith adjustable air openings. v

11. In a Stoker, a discharge conduit, vafneemt:-

able cover. onthedischarge conduit havingfa re''=v cess therein, a movable cover mounted in and closing said recess and being hinged to the first named cover, and an adjustable guide vane disposed Within the discharge conduit and supported by the movable cover.

12. In a stoker, a discharge conduit, a detachable cover on the discharge conduit having a recess therein, a movable cover mounted in and closing said recess and being hinged to the rst named cover, said movable cover provided with air admission means including an adjustable air opening, and a guide vane in said conduit mounted on the movable cover and constructed to be adjustable at will to act on the fuel prior to the action thereon by said air admission means.

13. A Stoker discharge conduit having its opposite ends offset with respect to each other and opening in opposed directions, said conduit changing gradually from an upturned D-shaped configuration in transverse cross section adjacent its one end to a substantially rectangular configuration in transverse cross section at its opposite end, said casing flaring or expanding from its D-shaped end to its rectangular shaped end.

14. A stoker discharge conduit having its op posite ends offset with respect to each other and opening in opposed directions, said conduit changing gradually from an upturned D-shaped conguration in transverse cross section adjacent its one end to a substantially rectangular coniiguration in transverse cross section at its opposite end, said conduit flaring or expanding from its D-shaped end to its rectangular shaped end and having an element of a universal joint formed therewith at its D-shaped end.

15. A stoker discharge conduit having its opposite ends offset with respect to each other and opening in opposed directions, said conduit changing gradually from an upturned D-shaped configuration in transverse cross section adjacent its one end to a substantially rectangular conguration in cross section at its opposite end, one pair of opposite Walls of said conduit being substantially equidistantly spaced throughout and the other pair of opposite walls of said conduit diverging from the D-shaped end of said conduit to its rectangular shaped end.

16. A stoker discharge conduit having its opposite ends offset With respect to each other and v opening in opposed directions, said conduit changing gradually from an upturned D-shaped configuration in transverse cross section adjacent its one end to a substantially rectangular configuration in transverse cross section at its opposite end, one pair of opposite walls of said conduit being substantially equidistantly spaced throughout and the other pair of opposite Walls of said conduit diverging from the D-shaped end of said conduit to its rectangular shaped end, one of said equidistantly spaced walls being re-f cessed adjacent the rectangular shaped end of said casing.

17. In a stoker, a discharge conduit member, a detachable cover member on the discharge conduit member having a recess therein, a hinged Y cover mounted in and closing said recess and being hinged to one of said members, and said hinged cover being provided with adjustable air openings.

18. In a stoker, a discharge conduit member, a detachable cover member on the discharge conduit member having a recess therein, a hinged cover mounted in and closing said recess and being hinged to one of said members, and an adjustable guide vane disposed within the discharge conduit member and supported by the hinged cover.

19. In a stoker, a discharge conduit member, a detachable cover member on the discharge conduit member having a recess therein, a hinged cover mounted in and closing said recess and being hinged to one of said members, said hinged cover provided with air admission means including an adjustable air opening, and a guide vane in said conduit member mounted on the hinged cover and constructed to be adjustable at Will to act on the fuel prior to the action thereon by said air admission means.

F. C. PICKARD.

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