US2190768A - Heating device - Google Patents

Description

C. L. BRYANT HEATING DEVICE Feb. 20, 1940.

5 Sheets-Sheet 1 Filed April 17, 1936 chu-1w Lfgant INVLNTQQ Feb. 2o, 1940. c. L. BRYANT 2,190,768

HEATING DEVICE @harlea LCBargantT lNwLN TOR ATTOQNLT?,

Feb, 20, 1940. c. L.. BRYANT 2,190,768

HEAT ING DEVI CE Filed April 17. 1956 5 SheetFs-)Sheet 3 H4 @df Chacha Braamt I N vLN TOR ATTORNLe C. L. BRYANT HEATING DEVICE Feb. 20, 1940.

Filed April 1'7, 1935 5 Sheets-Sheet 4 Chars Iza I Bryant l N VLM-ro Q Feb. 20, 1940. C, BRYANT 2,190,768

HEATING DEVICE Filed April 1v. 1936 L Bryant INvLNToR Br Patented Feb. 20, 1940 HEATING DEVICE Charles L, Bryant, Cleveland, Ohio, assigner to G. L. Bryant Corporation, Cleveland, Ohio, a

corporation of Ohio Application Apriti?, 193s, serial No. '14,929

20 Claims.

This invention relates to heating devices, more particularly to devices adapted to be used with furnaces, and of the typeusing fluid fuel as a source of heat energy, and the object of this `invention is to provide new and improved devices of these types.

In the drawings accompanying this speciiication and forming a part of this application, 'I

lo., have shown, for purposes of illustration, seveial u forms which my invention may assume, and in these drawings:

Figure 1 is a vertical sectional view of one all in the embodiment of this invention,

Figure 6 is a vertical sectional view similar to Figure l, but illustrating a differentembodiment of the invention,

d substantially to the line 1-1 of Figure 6,

Figure 8 is a vertical sectional view of another #embodiment of the invention, parts being broken away and parts being shown in elevation, this view corresponding generally to the line 8 8` of Figure 9,

Figure 9 is a horizontal sectional view, partly in elevation, corresponding substantially to the line 9 9 of Figure 8,

Figure l0 is a vertical sectional view correi0 spending substantially to the line IU--I of Figure 9,

Figure 11 is a vertical sectional view similar to Figure 8, but illustrating still another eml bodiment of the inventionyand l Figure 12 is a horizontal sectional View corresponding substantially to the line 12--12 of Figure 11.

The embodiment of the invention disclosed in Figures l through 5 is particularly suitable for use with a furnace 20, which has an ash-pit 2l, and a fire-box 22, the ash-pit and fire-box here being only fragmentarily shown. The'ash-pit 2l is offset' with respect to the fire-box 22 to form a shoulder 23.

As here shown, a fuel supply pipe 24 extends Figure 5 is a perspective view of a burner used Figure l is a horizontal section corresponding` into the ash-,pit 2|, and is connected by an elbow 25 with an upstanding pipe section25, the upper end of the latter `being connected with manifold means 21, which in turn has connection with a burner member `28. `The manifold means `21 comprise a plurality of connected individual manifoldsy 29, the number of manifolds used `de-` pending upon the amount of heat to be supplied. inasmuch as allof the manifolds 29 are` alike, only one will be described in detail. I l

The manifold 29 comprises an elongated chambered member preferably formed as bycasting. The manifold 29, in transverse section, has a rounded lower wall 30, generally parallel vertical walls 3l and 32, a top wall 33a wall 35i anguiarly extending from the vertical ,wall 3l, spaced and generally parallel to the top Awall `33, and a wall connecting the angular wall 34 with the topwa11 as. The vertical wail stas shown in Figure 31, stops shortof the top wall `33.` The construction of the manifold thus` described provides `two elongated troughs closed from communication with the exterior ofthe manifold by means of integral end walls 33 spanning the ends of the troughs to form cham-` bers 31 and 38, and the end walls 36 are provided with screw-threaded apertures 35i. The elongated chambers 31 and 38 communicate throughout their length, the chamber 31 being considerably` smaller in cross` sectional area than the chamber 38and having its bottom Wall 3ft disposed above the bottom wall 30 of the chamber 38, The bottom wall 30 of the chamber 38 is also provided with a screw-threaded opening to` receive the screw-threaded extremity of the fuel supply pipe2'6. 'I'he vertical wall 32 isprovided with a screw-threaded opening which may be used to connect the manifold 29 to another manifold 29, but inthis instance the screwthreaded opening is closed by a `plug 40. In usual practice, when it is desired to connect together a plurality of manifolds 29, coupling pipes 4I are threaded into apertures 39 of adjoining known means,` one preferred `means including the members 42 integrally with the manifold. Each of the members 42 provides a mixing lchamber 43, into which air is drawn through a plurality of arcuate openings 44 formed in the nat front face e5 `of the respective member EL rThe adjusting plate 4'! may further be provided with a peripheral flange engageable with the periphery of the front face 45, and maybe held in any desired adjusted position by any well machine screw passing through an arcuate slot in the adjusting member and threading into a screw-threaded aperture formed yin an ear i8 integrally cast with the front face 45.. .The quantity of vair being mixed with the fuel in the chamber d3 may beregulated by opening or closing the openings M in the front 'face 45 by proper movement of lthe adjusting plate el. Communication between the mixing chamber 43 and the chambers 3l' and 3S is effected by a nozzle orifice screw-threadedv into the wall 35 and aligned with the axis ofthe mixing chamber 43. l

A burner member 25 is adapted to cooperate with each mixing chamber 53 of the manifold` 29, and as best shown in Figure 1, the burner member 28 comprises a tubular portion 49, hav? ing an extremity 55 fitting within the aperture formed in the boss 65 of the member 42, and held in position by means of` a setl screw 5l threaded into and passing through a walll of the boss 46. Inserting movement of the extremity 50 is limited by a shoulder spaced inwardly on the tubular portion i3. 'I'he other extremityof the tubular portion tapers gradually to a widened part 52, and at this part the vburner mem? ber is provided with an upwardly extending burner mouth 53, which as bestshown in Figure' 5, is'generally rectilinear and elongated in a plane transverse to the axis of theV tubular portion 49,v and the burner mouth 53 tapers' as it extends up- Wardly to provide a narrow elongated burner opening 54. To better describe the burner mouth, a face view would appear to be wing-shaped or generally V-shaped.

Spaced from the burner mouth 53 is` an upstanding ear 55, provided with a serew-tl'ireadedl aperture 56, and disposed between the burner mouth 53 and the ear 55 is a transversely ex` 5l, generally in line with the web 55 is a pair of abutments 5l, and projecting from the burner mouthy 'towards the ear 55 is' a lug 62 havingan inclined face 53 spaced from the ear 55.

Carried by the burner member 2B is a baille means ,65, comprising a pair of spaced plates. 65 and 66, integrally connected at their longitudinal ends by end walls 5l' and 53 to form an Yelongated rectangularly shaped chamber 59, as best shown in Figure 2. Referring particularly to Figure 4, it will be noted that the wall 65 projects somewhat below the'wall 56 to provide a projecting leg l0.l The wall 65, at its lower extremity,lis

the top surface of the ledge provided with an angularly extending ledge ll, and at its upper extremity with curved lip 'i2 partially overhanging the upper portion of the chamber 69. The end walls 57 and 58 extend only the length of the wall 65, the wall 5l being provided with a tongue "i3, and the wall 613 being provided with a groove lli, the tongue and groove construction providing for interconnection with adjoining baille means 65.

As best shown in Figure l, the leg lil, of a bai-f ne means t4, is disposed within the space eiined byfthe inclined face 53 of the lug 52 and the adjacent face of the ear 55, the leg lll resting on It will be noted that the space provided by the face S3 and the ear Y55 is considerably greater than the thickness ofthe leg lll. To hold the baille means in a desired position, a bolt 'l5 isI threaded into the' threaded aperture 55 of the ear 55, and proper l El 54, and the fuel supply conduit 25 is connected to the elbow 25. The elbow 25 is provided with ardownwardly extending internally threadedy tubular part Tl, which screw-threadedly engages a 5 screw-threaded rod 'i8 forming a part of a standard means l5. The standard means 'l5 further includes a foot 85, provided with an elongated tubular part having a screvwthreaded aperture 8| which receives the lower end of the rod 18, and provides for vertical adjustment of the entire heating device with respect to the furnace 25. i

c Referring to Figures 2, fl, and 5, it will be noted that the lateral extent of the walls 55 and 65 is substantially equal to the lateral extent of the channel 53, so that one b rner 2li and one baille means 55 will constitute a unitary assembly. If only one manifold 29 is used, the` apertures 3G areplugged and the fuel conduit is connected to the aperture in the bottom wall Sil, and a burner member Z5 is properly connected to each of the bosses i5 of the The baule means 64 are then r`disposed. in proper relation with the burner members 2li, with the adjacent tongue and groove formed thereon in mating relation. One end of'a is then bolted tothe ledge 5S, the other end bearing against the abutment 23 formed on the furnace An.- other plate 83 is disposed so as to have its one end carried by the ledge 'li of the baille means and its other end carried by an abutment on the fur-v nace, or by ledges formed on baille means disposed at the other side of tbe furnace. The plates 82 and 83 separate the furnace into a lower compartment and an upper compartment, and passage of air from the lower compartment to the upper compartment is effected only by the passage through the baffle means 5ft.

From the foregoing description it will be evident that in operation of the furnace, primary air will be mixed with the fuel, which. in this particular instance is' gas, in the mixing chambers 43 associated with the manifolds Z5, and this mixture is burned at the burner opening 5d. Secondary air will be drawn upwardly from the ash-pit 2l, and escapes only through the cham*- the llame by the lips 12 and will readilyucombine j struct these baffle means.

with any` unburned gases at the tip of the name to forma combustible mixture that will ignite and furnish further heat, and also produce combustion relatively unaccompanied by unburned gases and undesirablesoot. Also, by reason `of the passage of air through thef chambers B9, the `baille means G4 will not become overheated, and

cheaper and lighter material may be used to con- Because of the particular construction ofthe burner opening 54,. the fiameissuing therefrom will be in the shape of a narrow elongated sheet, and heat energy from this flame will be'deflected towards the fire-box by reason of the `adjacent disposition of the inclined baflie means 64. It will f before.

tion, it will be obvious that the construction on now of fuel is turned to off position, the flame at the burner mouth 54' is `prevented from flashing back to the manifold chamber 38 and fuel supplyconduit 24 by reason of the interposition of the vertical wall 3| in the passage normally traversed by such a ash back ame. It will be appreciated that the vertical Wall 3| interrupts such flash back, and thereby avoids a dangerous condition common to the ordinary type of burner. In addition, air which may enter the burner opening 54 and the mixing chamber openings 44 is prevented from entering the manifold chamber 38 and supply conduit 24 when the` fuel control valve is in off position, because the air will first enter the chamber 31 and settle to the bottom of the `chamber and be trapped therein for the reason `that the air is heavier than the fuel gas `commonly used, and willdisplace this gas in the` chamber 31. The air in the chamber 31 forms an air seal which seals the orice opening in the mixing chamber 43, and prevents any gas remaining in the chamber 38 or conduit `2|; to pass to the mixing chamber 43,; thus, after the gas in the` burner 28 `is consumed, the flame cannot flash back to the mixing chamber, for the reason that there will be no gas in this mixing chamber.Y

Referring to the embodiment disclosed in Figures 6 and '7, the manifold means herein shown comprises a manifold 84 in some respects similar to the manifold 29, in that chambers 85 and 86 and mixing chambers 81 are provided which are similar to the chambers 31 and 38, and mixing chambers 43, heretofore described. As before,

the chamber 85 is disposedon one side of the'` 88, similar to the chamber 85 is provided on the other side of the chamber 85, and the chamber 88 `communicates with a mixing chamber 89 as Therefore, from the foregoing descripone side of the centerline of the manifold is similarto that on the `other side, and in this instance, the manifold 84 is provided with pairs of axially aligned mixing chambers 81 and 89, which have connections to burner `members 280l and bale means 64a in the same relation described in connection `with the embodiment disclosed in Figures 1 through 5.` `In this embodiment,'the chamber 86 receives the fuel from a supply conf- `standard means 19a.

" The embodiment disclosed in Figures 8 through l 10 comprises amanifold 90, arcuate in plan'view, and used particularly in furnaces having a nonrectangular fire-box. The manifold 90 provides a generally `closed chamber 9|, which is locally interrupted on the outer wall at the upper ex tremity thereof at spacedpoints 92. Communicating With the interrupted parts 92 of the outer wall of the chamber 9|, are radiallyextending chamberedhousings 93,2integr`ally cast With the manifold 90, and completely enclosing the interrupted parts 92. Extending radiallyfrom the housings 93, andv cast integrally-therewith, are semi-spherical chambered members 94, ywhich have` 4their mixing `chambers 95 communicating with the interior ofthe chambered housings 93 through orifice nozzles 98. The chambered members 94 are provided with openings and bosses similar to the members hereinbefore described, and the amount of air admitted to the mixing chambers 95 is regulated by apertured adjusting plates as before.

As best shown in Figure 9, themanifold 98 is provided with four radially extending mixing chambers 95. The ends of the manifold are provided with apertured ears 91 which may be secured to suitable connecting means to hold the manifold` 99 to the walls ofthe furnace, or to another manifold 99. As before, the chamber 9| receives its fuel from -a supply conduit` 24h, 4and the conduit and the entire burner mechanism may be adjusted longitudinally of the furnace by a standard means 19h. If more than one manifold 9U is used, fuel may be supplied to the other manifold 90 by a suitable connection with the supply conduit 24h and the other manifold may be adjusted bythe use of a standard means sim-- ilar to the standard means 19h. In some instances, it may be` desirable to run a conduit between the inner walls of the manifolds to be connected, and for this purpose the inner` walls are provided with threaded apertures 98 which are normally closedV by plugs 99.

In this embodiment the burner members 28h are somewhat similar to the burner members 28, but differ in the respect that the burner mouths 53h are arcuately shaped to` `conform generally means 64b are laterally curved and are connected i to each other by the tongue and groove joints to form an arcuate baffle device. The channel portions 58b, in this instance, cooperate with the channel portions of the adjacent baffle means to provide an arcuate channel to which the plate 82h is attached. 'Ihe plate 83h rests on the arcuate shoulderformed by the ledges 1 IbI of the cooperating baie means 54h. The plates 821) and 83h, as before, separate the furnace into upper and lower chambers. In some instances, when the manifolds 99 do not forma complete annulus. suitable plate means (not shown) are secured to the plates 82h" and 83h to prevent the secondary air from following av course other than through the chambers in the baffle means 84h;

The operation of the construction shown in Figures 8 through 10 is generally similar to that described in the embodiment disclosed-in Figures l through 5, the interruptions 92 in the outer wall of the chamber-9| providing bailiemeans to prevent ash back of the flame from the burners 28h to the manifold chamber 9|. Also, the chambered housings 93 provide pockets into which air infiltrating through the openings in the burners 28h and openings in the mixing chambers 95 may f be trapped, to prevent such air from reaching the manifold chamber 9i and vsupply conduit 2.41).

In the embodiment disclosed'in Figures ll and 12, the heating meansherein disclosed are particularly adapted for use in furnaces having a circular and relatively small fire-box. The heating means comprises a manifold |86, forming a generally circular chamber l t i. The chamber lill has its'outer wall, adjacent the upper extremity thereof,v locally interrupted, as shown at m2. j Communicating with each of the interrupted portions m2 is a radially extending chamberedhousing m3, integrally formed with the manifold |00, andintegrally formed with each housing- N3 is a semi-spherical ehambered member iiili, providing a mixing chamber lilli.' Communication from the manifold chamber lili to the mixing chamber W5 is provided by means of an orice nozzle |06.

Burner members 23o and baffle means 64C cooperate with each manifold chamber in a manof the manifold chamber lill., :As shown in Figure l2, the side wall of the chamber lill is provided with a screw-threaded ,aperture lill which is normallyclosed by a plug i538, and the fuel supply conduit 24o may in some instances be connected tothe aperture ill'l.

The baffle means 612C, by reas-on of their `tongue` and groove connection7 form algenerally an.- nular baille to direct the `flames issuing from the burner opening 54e towards the Walls of the nre-box, As before, aplate 82,0v is secured to the ledges 59e ofthe channels 58C, and a f plate 83o is supported by theledges provided by the abutments 'l |c formed on the baille means Stic. It will be appreciated that the baffle means 54e do not provide a` complete annular construction., but if such construction is desired,

' the end baiilemeans 64o adjacent theplug Hi8l may be elongated laterally to close the gap. However, in this instance, the baffle meansvare all made of the same size and the gap formed is preferably disposed adjacent the door opening into the fire-box. To prevent secondary air 'from following a courseother than through the chambers @9c in the baille means 64o, a suitable plate lliiis secured to the plates i220 and 83e andy closes the short circuiting air gap between the upper and lower chambers of the furnace. v

The ventire heating construction, including the supply conduit Zilc, manifold |09, burner niembers 28e and baffle meansilic, is adjustable vertically of the furnace, as before, by an adjustable standard means 19e'.

. The operation of the embodiment disclosed in Figures ll `and l2k is similar to that described in connection with' the embodiment disclosed in Figures 8 ,tllrollgll l0, in .thatthe Walls of the manifold chamber Il adjacent-the'interrupted portions prevent flash back of flame to the manifold chamber 10|, and the chambers in the housings l03 prevent air from infiltrating to the manifold chamber IUI.

From the foregoing it will be apparent to those skilled in the art that the illustrated embodiments of my invention provide new and improved heating devices, and accordingly, accomplish at least the principal object of my invention. It further will be obvious to those skilled in the art that the illustrated embodiments of my invention may be-I variously changed and modified without departing fromthe spirit of baiile means having a passage for supplying secondary air to a point adjacent the outlet of said burner, said passage being so constructed and arranged that said secondary air supply is independent of said primary air supply.

2. Heating means', comprising: a manifold, connectible to a source offluid-fuel supply; means providing a mixing chamber, Vsaid chamber communicating4 with the interior of said manifold and receiving fuel from said manifold, and having means for supplying primary air to'wthin said mixing chamber for mixing with the fuel within said, mixing chamber; a burner, connected to said mixing chamber, receiving the mixture of fuel and primary air from said mixing chamber; and a member, constructed and arranged to direct the heat energy provided 'by the flame atthe burner outlenand. be heated bythis heat energy, said member having` a conduit terminating above the yburner outlet, for supplying secondary air, independent of said primary air supply, to the flame and the products of combustion rising from the flame, the secondary air beingV heated by its passage through said ,conduit -and j oroviding combustion of substantially all combustible material from the flame at the burner outlet.

3. Heating means, Comprising: a burner, having `spacedapart abutments; a directing member, for directing heat energy provided by tho iiame` atsaid burner, having a portion disposed between said abutments, and bearing upon burner, said portion being of a thickness, less than the spacing of said abutments, said ber being so constructed and arranged to be normally urged to a position wherein said portion engages surfaces of each of said abutments; and adjustable means', constructed and arranged to engage said portion in certain adjusted positions, to urge said portion away from engagement with the surface of one of said abutments, and thereby change the position of said directing member.

4. Heating means, comprising: a burner, having spaced-apart abutments, one of said abutments having a screw-threaded. aperture; a directing member, for directingheat energy provided by the flame at said burner, having a leg disposedbetween saidY abutments, and bearing upon said burner, said leg being of a thickness less than the spacing `of said abutments, and said memberbeing so constructed and arranged to be biased to an inclined position wherein a portiongenerally overli'es the burner mouth and said leg is in athwart relation with respect to said abutments; and an adjusting screw, threadedthrough said screw-threaded aperture, for engaging said leg in certain adjusted positions to move "said leg out of engagement with the abutment carrying said screw, and move said direct'- ing member toa differently inclined position.

5. Heating means, comprising: amanifold device, providing a manifold chamber connectable to a source of fuel supply, a mixing chamber hav- `ing an orifice opening establishing communication with said manifold chamber, and a trough interposed between -said mixing chamber and said manifold chamber, and forming at least a part of the conduit through which fuel must pass when flowing from said manifold chamber `to said mixing chamber. a

6`.` Heating means, comprising: a `manifold device, providing a manifold chamber connectable to a source of fuel supply, a mixing chamber having `an orifice opening in a defining wall establishing communication with said manifold chamber, and a trough `within said device and interposed between said mixing chamber and said manifold chamber, and forming at least a part of the conduit that fuel must flow through when passing fromr said manifold chamber to said mixi ing chamber, said trough comprising saiddening wall and a wall spaced therefrom, said spaced wall extending above said orifice opening.

'7. Heating means, comprising: manifold means, connectable to asource of fuelsupply;

` mixing chamber means, receiving fuel from said `manifold means, and being apertured` to admit air to said mixing chamber so that the air maybe mixed with fuel from said manifold means to 'fc-rm a combustible mixture; burner means, receiving the combustible mixture from said mixing k chamber, and having a burner opening at which said combustible mixture is burned; and means,

interposed between said mixing chamber means and said manifold means, constructed and arranged to provide an air seal when flow of fuel` to said manifold means is interrupted, said air seal being positioned to interrupt fuel remaining in said manifold means from flowing into said mixing chamber means.

` 8. Heating means, comprising: ma nif old means, connectable to a supply of gaseous fuel that is lighter than air; mixing chamber means, having an orifice opening providing for the passage of` fuel from said manifold means to said mixing lchamber, and being apertured to admitv air to said mixing chamber so that the air may` be mixed with fuel from said manifold means to form a combustible mixture; burner means, re-

ceiving the combustible mixture from said mixing chamber, and having a burner opening at which said combustible mixture is burned; and trough means, interposed between said manifold means and the orifice opening in said mixing chamber means, constructed and arranged to provide an air seal when flow of `fuel to said manifold means is interrupted, said air seal extending around said orifice opening to seal said opening, thereby preventing the lighter gaseous fuel remaining in said manifold means from flowing into said mixing chamber means.

9. Heating means, comprising: m a n i f o 1 d means, adapted to receive a gaseous fuel that is combustible mixture from said mixing chamber,

and having a burner opening at which said combustible mixture is burned; and trough means, interposed between said manifold means and the orifice opening in said` mixing chamber means, and comprising a lipso positioned that the gasecus fuel must flow upwardlyfrom saidmanifold means, over said lip, and then downwardly to said orifice` opening, the top of said lip beingat a higher level than said orifice opening, said trough means filling with" air whenilow of fuel to said manifold means is interrupted, thereby providingan air seal extending above said orice opening to seal said opening, whereby the. lighter gases are prevented froinflowing downwardly to said orifice opening. I

10. Heating means, `comprising: a` manifold, connectable to a source `of fuel supply; mixing `chamber means, having 1an opening providingfor `the passage of f uel from said manifold to said mixing chamber, and being` apertured to admit air.

movable with respect to said burner opening, di-

recting the heat energy provided bythe flame at the burner opening, and being heated by this heat energy, said baille meansV being hollow and open at thebottom and the top," and the top being positioned-above the burner opening, whereby air is drawn inwardly of the bottom of said baffle means and passes, through said hollow baille means and is heated, and passes outwardly at the top and into the pathof the' products of combustion rising from the `burner opening, thereby effecting substantially complete combustion.

11; A furnace, comprising: a lire-box; manifold means, connectable to a source of fuel supply; means, providing a mixing 4chamber communicating with said manifold means, andhaving a regulatable opening through which primary air may pass to be mixedL with the fuel in said mixing chamber; burner means, communicating with said mixing chamber, and having a burner opening positioned adjacent the defining wall of said nre-box; chamberedbaie means, extending upwardly with respect tosaid burner opening, for directing the heat energy from said burner opening toward said defining wall, said baffle means being open at its bottom and top and having its top above the burneropening, so that secondary air may'pass throughsaid baille means and into the path of the products of combustion rising` from said burner opening; and., plate means,

so constructed and arranged' that air rising from the lower portion `of said fire-box may pass to the opening in said mixing chamber means, or to the chamber of said baille means independently of said mixing chamber.

l2. Heating means, comprising: burner means, lconnectable to a source of fuel supply, having 30 l ter, saidwall having means forreceiving the end -tion rising from said burner opening means.

13. Heating means, comprising: a single casting, providingan elongated manifold chamber adapted to be connected to a source of fuel, and providing also a plurality of hollow bell-shaped portions spaced-apartfalong the `length of said manifold chamber, each bell-shaped portion being closed by a generally plane wall having openings adapted to be controlled by a movable shutter, andeach of said walls having means for receiving the end of a burner tube, each of said bell-shaped 'portions communicating with said manifold chamber, and forming a mixing chamber wherein fuel from saidmanifold may be mixed with air admitted through the openings in the respective wall.

` 14. Heating means, comprising: a single casting, providing an elongated manifold chamber adapted to b e connected to,y a ysource of fuel and providing also` a 'pluralityof hollow. bell-shaped portions projecting from opposite sides of said manifold chamber,"each bell-shaped portion being closed by a generally plane wall having openings adapted to be controlled by a movable shutof a burner tube, and said bell-shaped portion communicating with said manifold chamber, and forming a mixing chamber wherein fuel from said manifold chamber may be mixedwith air admitted through the openings in said wall.

15. In combination: a fire-box; burner means, so constructedand arranged that the iiame'at,v

the opening offsaid burner-means is arranged in a line following the dening `wall of said firebox; and directing means, positioned adjacent said burner means, comprising a plurality of members, each being chambered and open at the bottomand top for the passage of air through the chambers, said members being arranged side edge to side edge, and each member havinga tongue at one side edge anda groove at the`- other Vside edge, the tongue of one member `lit-l bottom for the passageof air through the chamf ber, the top of each member having a curved lip directing the air passing through the respective member in a direction toward the products of combustion rising from the adjacent burner opening, said members Abeing arranged side edge to side edge to extend substantially in vline with the y burner openings, each member having a tongue atkone side edge and. a groove at the other side edge, the tongue ofv one memberntting into the groove of an adjacent member.

17. Heating means, comprising: a unitary body, having a first portion providing a manifold chamber adapted to be connected to a source of fuel, and having also at least one hollow bellshaped portion projecting from said first portion and a wall closing the mouth of said bell-shaped portion,said wall having an opening,` and having also means for receiving the end'of a burner tube, and the interior of said bell-shaped portion communicating with said manifold chamber and forming a mixing chamber wherein fuel from said manifold chamber may be mixed with air admitted'through the opening in said wall.

18. Heating means, comprising: a single casting, having-'an integral first portion providing a manifold chamber adapted to be connected to a source of fuel, and having also at least one integral' hollow bell-shaped portion projecting from said V`first portion and an integral wall closing the mouth of said-bell-shaped portion, said wall having anl opening, and having also means for receiving the end of a burner tube, and the interior 4of'said bell-shaped portion communicatingwithsaid manifold chamber and forming a mixing chamber wherein fuel from said manifold chamber may be mixed, with air admitted through the opening in said wall.

19. Heating means, comprising: a unitary body, having an 'arcuate first portion providing' an arcuate A manifold chamber adapted to be connected to a source of` fuel, and having also at least' onerhollow bell-shaped rportion projecting from said first portion, and a wall closing the mouthof said bell-shapedportion,`said wall having an opening and having also means for rreceiving the end of a burner tube, and the interiorof said bell-shaped portion communicating with said manifold chamber, and forming a mixing chamber vwherein lfuel from said manifold may be mixed with air admitted through said wall opening.

20. Heating means, comprising: a unitary body, having an annular first portion providing an annular'inanifo'ld chamber adapted to be connected toa source of fuel, and having also a plup tube, the interior of each bell-shaped portion, communicating `with said manifold chamber,v

forming individual mixing chambers wherein fuel from said manifold may be mixed with air admitted through the opening in a respective wall.

CHARLES L.` BRYANT.

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