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Патент USA US2403829

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July 9, 1946- v'
Filed Nov. 29, 1941
~4 Sheets-Sheet 1'
,bym, 5/44, ¢M
~_Jl1lY‘9, 1946-
Filed Nov. 29,’ 194'].- j
4 Sheets-Sheet 2
July 9 194$
Filed Nov. 729, 1941
4 Sheets-Sheet 3
‘July 9, 1946-
2,403,829 I
Filed‘ Nov. 29, 1941
4 Sheets-Sheet 4
Patented July 9, 1946 ‘
2,403,829 A
1 time -
Hugh w. Sanford and William vPrBiddle, In,
3 ,2 1951-.
Knoxville, Tenn. ;_said Biddle assignor. tosaid
Sanford, V
‘ ApplicationNove'mber 2 9,
28 Claims.
1,941, SerialNo. 421,066
(01. 110-29) "'
of the fueTi'Mt’EEM
This invention-relates to an improvement in _ _ bed‘ asifast as the lower parts
hopper are, consumed. ‘
magazine feed stovesof the characterdesigned
In‘ the preliminary stages wherein‘ heat nor
for the burning of coal, particularly soft coal,
mally reaches to ‘the fuel in the magazine to
either in small sizes or in lumps.‘
~- ‘.
some extent, the; bituminous 'coal forms a sticky
Several magazine feed stoves have been pro’
tar compound‘ which‘ causes it to adhere to the
posed heretofore, but dif?culty has been encoun
sidewalls of‘ the magazine, but this in time will
tered with these designs in more than one respect.
and at this latter stage the stick
In the ?rst place, when soft coal is, used, the
to the sidewalls is due principally,
coal in the magazine hopper, when. fresh-?re is'
started, is soon penetrated byv the heatof the 10. to the. pressure. exerted by the expansion of the '
fuelduring the coking process.’
, ;
?re, with the result that all the volatile matter
in the coal-is discharged quite'rapidly. With
by ‘admitting primaryv air to the sides of the;
a'hundred pound charge of fuelin the magazine,
magazine throughout the major portion of the
the volatile matter is completely. out of the fuel
height, thereof to produce heating of the periph-v
within probably an hour to one and one-half, ' eral portion ,of thecolumn of fuel, liberating the
hours from the time the ?re starts, burning. - This
volatile gases therefrom, and also supporting com
rapid discharge of the volatile matter has the
bustion of the peripheral portionof the fuel,
result of making the operation; ofthe stove ex
which keeps the column of fuel burned away
ceedingly smoky during'this initial period- Sec
ond, it is almost impossible to burn this excess 20 from the side walls as, combustion progresses,
thus preventing sticking to the walls, andcaus
volatile matter at one time e?i'ciently, and’ a
ing vthe fuel to ' settle :down gradually during
large part of the heat is wasted up the chimney,
the‘ combustion process.
In the third place, during the coking of the
Since it is di?‘icult to furnish an adequate sup
fuel by discharging the volatile matter .in this
ply of primary air to reach all of the volatiles and
way, an expansion of the’ fuel bed takes place to
such extent that the mass of coked fuel is bound ' coke, in the‘. fuel column, ‘provision is made for
admitting a secondary air supply to the combus
tightly to the side walls of the magazine, with
the .result that the mass of unburned coke is ' tion zone. Thus any volatiles’ or gases which
held against falling as the ?re burns'outunder 30 reachthis point: in the bottom ?ue in an un
burned state,‘ due to a lack of the necessary
neath. This has the e?ect of leaving this mass of
oxygen, are thereby supplied with secondary air
unburned coke considerably above the lower com
for complete consumption thereof, causing com;
bustion zone, and the ?re eats into :this mass
plete combustion of the fuel.
I 4 '
of suspended fuel from the bottom in such fash
Both primary and secondary air are preheated
1011 that it is very difficult to control the rate of
whenv'admitted to the stove, thereby aiding com
combustion. Experiments with more than one
bustion, and both may be controlled so as‘ to
conventional prior design have indicated that the
regulate the burning of the volatiles, reducing
suspended coke will not fall down'into the com
these as much as required to obtain complete
bustion zone until it is about two-thirds con-y
combustion. 'Since free gases are not thereby
sumed, unless it vis poked down by an operator,
which is not an easy thing to do.
_ ,
One of the primaryobjects of this invention
is to provide a magazine feed stove, for bitu
minous coal particularly, that avoids vthe quick‘.
driving off of the’ volatile matter in away that:
is inef?cient and also creates an excess of smoke.‘
This invention permits the main body of the fuel
in the magazine'to remain unvolatiliz'ed fora
long period of [time iwith'a gradual discharge of
volatile gases from this'main body of fuel‘, where
by the, heat value of this volatilevmatter can be
obtained by the normal ‘processes of‘ combustion,
and, ?nally, it provides meansf'by Whichg'the fuel
in the hopper is‘s‘uf?ciently freed from'the side
walls of the magaZine‘tQfall'downVon/the; fuel
‘given ‘off, but aresubstantially consumed, this
results in the discharge of substantially no smoke.
Therefore, it is substantially a smokeless stove.
A; preferred embodiment ‘of the invention is
shown in the accompanying drawings, together
with modificationsthereof, in which:
Fig. ‘l isfa vertical sectional view through the
‘ ‘Fig.2 is a, horizontal sectional'view there
through on the line 2-'-2 of Fig. 1;
‘_ Fig.3'is'ra similar'view on the line 3-3 of Fig. 1;‘
I Fig.4 is a diagrammatic view showing the mag
azine ?lled;
Fig. 5 is a. similar‘
diagrammatic view
thepartial’combustion of the fuel;
Fig. 6 is a detail vertical section showing a
modi?ed form of primary air supply;
is slidably received in the notch 22 for expansive
action under heat, or for ready removal and re
Fig. '7 is a vertical section through a stove hav
ing a modi?ed form of magazine; and
Fig. 8 is a, horizontal section therethrough.
The invention is shown as applied to a maga
zine heating stove constructed with a fuel maga
placement when desired. The channel shape of
azine I. A cover ‘I extends over the drums 3-‘ and
wise on each channel bar 23 on opposite sides of
each bar 23 forms a passageway therethrough,
which is adapted to have communication with
the fuel magazine I through ori?ces 24 formed
at intervals in the inner wall of said channel and
zine designatedgenerally by the numeral I adapt
through ori?ces 25 in one of the lateral ?anges
ed to receive a quantity of fuel, such as coal,
thereof. The ori?ces 24 and 25 are arranged at
therein necessary to support combustion. The 10 intervals along the length of each channel 23, as
magazine I is formed and enclosed by membersv
shown in Fig. 1, to admit air from the passageway
23, hereinafter described. A heating'and com
through the channel into the fuel magazine I at
bustion chamber 2, is disposed beside the fuel
the periphery of the latter.
magazine, as shown particularly in Figs. 2 and 3.
The channel bars 23 are spaced relatively close
The fuel magazine I is constructed with a'sur 15 together, as shown in Fig. 2, so that lumps of coal
rounding drum 3, shown as of sheet metal, and
will not get into the space therebetween and
having a heating drum 4, attachedtdbpposite
thereby the ori?ces 25 will be effective to supply
sides thereof ‘by seams 5. The heating. drum 4
air tothe- periphery of the column of fuel, even
has a partition 6, extending transversely thereof
if the ori?ces 24 should be closed by the lodging
between the heating chamber 2 and the fuel mag 20
4 and forms the top of the stove. The top ‘I has
a feed opening therein over the magazine I Which
is provided with a lid 8 for closing the same.
of fuel therein. However, ribs 26 extend length
the row of ori?ces 24 therein to keep the coal
from lodging in the ori?ces plugging them up, or
from lying ?at thereagainst. Any ?ne coal that
Supporting the drum 3/that‘encloses the fuel 25 should pass through the air ori?ces 24 will fall
magazine I, and the heating drum 4, is a base 9,
downward through the channel bars 23 into the
within which is mounted a base casting III which
ash pit at the bottom, thus keeping these air pas
extends transversely beneath the fuel magazine
sageways clear.
and the heating chamber, and is supported on'
The lower ends of the channel bars 23 are sup
the’ periphery of the base 9 intermediate the lat
ter and the drums 3 and 4, as shown in ‘Fig. 1.
Mounted within the base casting I01 beneath
the fuel magazine _I, is a rotary ash grate II; be
neath which is > supported a draw-center ash
dump-I2 within an ash pit I3; The rotary ash‘
grate. Hand ash dump I2‘are of conventional
construction, designed for turning movement in
shaking down the‘ ashes into the ash pit ‘I3, while
the ash dump I2 ‘is adapted to be withdrawn for
dumping the entire contents of the fuel- magazine.
The ash pit I3' has a door I4 in air-tight sealing
relation therewith at the periphery of the base
9 adapted for opening movement for access to the
ash pit I3.
ported on the upper edge of a ?re-brick ring 21,
which is'seated in turn upon the base casting
I0,'0r carried thereby. The?re-brick 21 hasa
series of grooves 28 extending lengthwise thereof,
,. forming air passageways in alignment and open
' communication with the passageways through
the. channel bars 23., The lower ends‘ of the pas
sageways 28 are turned inward to the inner sur
face of the ?re-brick 21, forming air jets 29
around the periphery of the column of fuel in the
fuel magazine I.
The fuel magazine is adapted to .contain a col
umn of fuel therein, rising from the ash grate I I,
with the primary‘. located at the
The base casting‘ III" has a transverse support-' 45 lower portion of said column of fuel. Extending
laterally therefrom in the base casting I0 is a
ing bar‘ I5 extending thereover in bridging rela
?ue 30 entirely above the ash grate II,
tion, one side of which is in sealing relation with
the outer end of which ?ue 30 is in open com
the lower edge of the. partition 3. The opposite
munication with the heating and combustion
edge of? the bar I5v isiin sealing relation withsthe
loweriedge of; the drum 3 forming an air space 50 chamber 2. Said heating'and combustion cham
ber 2 has transversely overlapped baffles 31 there
I6 therebetween which/partially surrounds the
in, as shown in Fig. 1, with a ?'ue outlet 32 at one
fuel magazine I, as shown in Figs. 2 and 3, and
side of the upper end thereof.
within which air space the primary’ air may be
Provision is made for admitting secondary air
preheated. Air isadmitted, to theair space I6
the burning zone at the bottom ?ue “for
through openingsv I‘! in one’ side of the drum 4,
combustion of any volatiles, gas or fuel
which openings are controlled by a slide damper
at this point, aiding particularly in the combus
I8» (Fig. 3).
tion of the volatile matter that remains in the
The upper end of the' air space‘ I6 is in open
fuel. when the latter has reached the' combustion
communication with a- distributing duct‘ I9 that
zone andthere discharges the volatile gases. For
surrounds a dome 20. The dome 20 extends down 60 this purpose, a preheating ‘chamber 33' is provided
wardly from thev fuel opening in the top ‘I into
'between‘the partition 6 and an‘ auxiliary parti
the upper end of the drum 3, and has a laterally
extending ?ange 2| thereon, extending outwardly
to the drum 3 and secured thereto for support
ing the dome 20-h
The ?ange 2| on the bottom edge of the dome
20, is provided with a, plurality of notches 22 in
the periphery thereof at spaced intervals around
the drum 3, each of whichnotches has a channel
member 23 extending downwardly thereth-roug-h.
A seriesof channelmembers 23 is. thus provided
surrounding and enclosing the fuel magazine-I
and forming the surrounding wall thereof, as
shown in Fig. 2'.‘ Each of. these channel members
is constructed preferably of a channel bar, andv
tion 34, as shown in Figs. 1 and 2. The preheat
ing chamber 33>has air inlets 35 at one end there
of- controlled by aregister 36’ of the slide valve
type (Fig. 2) .
The auxiliary partition 34‘ is provided with a
ledge 31 at the lower edge thereof for supporting
a ‘?re-brick .ba?‘le 38 thereon, which ?re-brick 38
has a shoulder 39 along. oneedge thereof in posi
tion to seat upon the ledge-31. The opposite side
of the ?re-brick 38 has aplurality of ribs 40 seat
ed upon a shoulder formed by the connecting bar
I5‘.~ This holds the ?re-brick baffle 38 \With the
r; side wall thereof spaced from the adjacent edge
of the transverse supporting bar'I5, with second
up through the heating chamber 2, around the.‘
ba?le's'3l' and out through the ?ue opening 32,
giving up their heat to the side walls of the heat
ing chamber 2, in passing therethrough. Due to
the consumption of-substantially all of the vola-'
ary air outlet openings 4| therebetween for ad
mitting secondary air from within the preheating
chamber 33 into the top of the ?ue 30 substan
tially at the burning zone. This mounting for
the ?re-brick baffle 38 permits it to be lifted up-.
ward in the chamber 33 and turned laterally on
tiles or gases, substantially no smoke results from
the ledge 31, swinging its lower edge to the left
the operationof the stove, after it is started.
in Fig. 1, thus releasing the ribs 40 from their,
supported positions on the adjacent edge of the
Therefore, it is truly a smokeless heater in which
maximum ef?ciency is obtained by reason of the
consumption of all‘ of the gases, even though soft
bar l5, which permits thelfire-brick baille38 to
be withdrawn. Replacement of'this ?re-brick
coal is used.
burned in the fuel magazine, this does'not cake
done by reversing the process thus described in
removing the old one. .
Where lump coal is used ‘as ' the fuel being
may be necessary at intervals, and this may be -
in the fuel bed to the extent that is encountered
In operation, it will be evident that the ?re may 15 in using smaller sizes of coal.‘ For that‘ reason,
the ori?ces 24 and 25 may be-omitted, if 'de-'
For in
sired, as shown in Fig. 6, the primary air vpass
stance, the kindling material is placed on the
ing through channel passageways 23' and pas
grate H, and the ?re started and then the fuel
sageways '28’ in the ?re-'brick 21', being dis
magazine I is ?lled with coal, substantially full,
charged at the inner face of the latter‘throughy
as illustrated generally in Fig. 4. The kindling
slots 29’ of larger size than the >jets'29 in Fig. ‘1. .
may be ignitedthrough' the ash pit l3'and grate
The slots 29' will supply the primary air for com-V
H,,and this causes a burning of the coal in the
be started in any convenient manner.
fuel column.
The main burning zone will ex
~ bustion in the burning zone;
Where ‘relatively '?ne fuel is used, to prevent
tend from the grate H upwardly substantially to
the upper portion of the ?re-brick 21, as shown
the vsuspension of the unburned fuel in'the'maga
generally by the ?ne dotted lines at the bottom in
Fig. 5. Primary air to support combustion in this
zine with rigid‘side' walls, it is found necessary
to provide primary'air which tends to burn‘ ‘away
zone is drawn inward through the jets 29 from
the fuel that is in contactwith the side walls of ‘
the magazine and leave an‘ open space‘between
With the shutters or slide valves I8 and 36 30 the'main'bulkof the fuel in the: magazine'and
the passageways in the channels 23.
the'side walls in such fashion that this unburned...
fuel will settle down into the combustion zone
at a rate that corresponds with the combustion
of -the"fuel*inwthe regular combustion vzone.
open, as shown in Figs. 2 and 3, air will be drawn
into the preheating chambers 16 and 33. From
the chamber 16, this air will pass‘around through
the primary airrdistributing duct l9, thence into
the channels 23 and downwardly therethrough,
. whensho'wever, a ‘large amount of lump coal‘is'
discharging in thejets 29 at the lower ends there
used;it found that contacts between the par
of. A part of this primary air is admitted also
tioles of coal are ins'u?‘icient to cause" the ‘fuel
through the‘ori?ces 24 and 25 in the surrounding
mass‘to ‘stick together and heatin‘such “fashion
.wall of the fuel magazine to the periphery of the
as to prevent the settling down of‘ unburned fuel,‘~
40 provided that the intake of primary air takes
column of fuel.
As these channels direct heat upward from the
place‘ only 'a relatively vfew inches above‘ the fuel‘v
primary burning zone to heat the peripheral'por
actually‘being consumed;
tion of the column of fuel, this peripheral portion
‘It is also di?icult to maintain a smokeless com}
will volatilize gases, the burning of which will be
bustlon while providing for two different combus
supported by ‘the air admitted thereto through 4,5 . tion rates; For example, if the airrsupplyto the
the ori?ces 24 and 25. This burns away the col
stove is sufficient to consume six pounds‘ of coal 7
umn of fuel at its periphery from the inner por
tions of the channels 23, as indicated in Fig. 5,
and prevents the column of fuel from sticking to
the periphery of the fuel magazine I. This pe
ripheral burning of the volatiles occurs while the.
center portion of the column of fuel is substane
tially .cool, below 900° F., so that it does not vola
tilize its gases appreciably.
This makes it possible for the fuel column to
settle downward as it is consumed at thebottom,
making it unnecessary for the fuel to be broken
down with'a poker, because it is not held in bridg
ing relation against the side walls of the fuel _
magazine by sticking thereto, as in prior maga
zine feed stoves. This combustion of the fuel at
the sides of the fuel magazine automatically com
pensates for the swelling action when the coal is
coked, and its settling down gradually maintains
a solid burning zone at the bottom of the column. '
Since it'is not possible'for an adequate supply
of air to reach all of the volatiles and coke in the
fuel column, a secondary air supply is provided
by'the preheating chamber 33. This secondary
per‘hour at maximum burning‘ capacity, then to
reduce’ the'_ air su?iciently to burn only one and
50 .
one-half pounds per hour, the heatofl the fuel
bed will be proportionately less, being then be
low 1300”
the temperature needed for com;
plete burning of gas and volatile
bituminous‘ coal.
matter of inostl
This is accomplished in the present invention
55 . by the manner of
admitting air to the column of
fuel in the magazine and the way in which the
combustion is accomplished. The bottom of the
column of fuel in the magazine is coked as a re-‘
sult of the manner in which the air is admitted.
60 If the primary air be reduced, this will pass
through the‘ fuel bed atthe point where there
is the least resistance to its ‘passage, at the bot
tom, where the combustion will take place. Then
when the amount of air is increased, the’ addi
tional air will‘pass into the magazine at higher
points about vthe circumference thereof,'e1fect-~
ing a burning away of the fuel at the periphery
of the fuel column.
The'low points where the primary air is ad
air is admitted to the burning zone through the 70
mitted on reduced draft, are the outlets desig
openings 4| at a point where combustion occurs.
nated 29, and when the draft is increased, the air
In this manner, any volatiles or gases ‘which reach
will be admitted successively at ,‘higher ‘points "
this point in the bottom ?ue?ll, are supplied with
through the ori?ces 24 and 25. This is an imporé
the necessary oxygen in the secondary air, so they
tant'feature of the invention, whereby the air
will be burned, and consumption thereof will be
complete. The hot products'ofcombustion pass. 75 I is admitted to the column of fuel about the lie? '
riphery of, ‘the latter and. passes down, the side
of this column penetrating. into it only slightly,
and_in such fashion as to burn the part. of the
tively?nconsequential. We have proved that
when the ?re is burning continuously and the
magazine is ?lled up with bituminous coal that
after the ?re has burned down close‘ to the com
bustion chamber, the original smoke from the
fresh fuel supply lasts only about four or ?ve
column of fuel immediately at the surrounding
wall which would otherwise stick to the wall and
prevent the automatic lowering of the-column as
combustion takes place.
minutes and is in a negligible quantity, and there—
after the operation is substantially smokeless.
After starting a fresh ?re with a magizine full
The entire column of fuel does not burn be
cause the primary air is drawn down about the
periphery thereof without substantial penetra
tion, not being passed directly through the center
of‘ the column, and no primary air being drawn
in fromthe bottom up into and through the col
of soft coal, we have found out that only about
twenty to twenty-?ve per cent of the volatile mat
ter is discharged from the fuel, even when the
combustion rate is high, during the ?rst hour.
umn of‘ fuel.
The rest of the volatile in the unburned fuel sub
Thus the fuel column will burn
only at‘ the points where primary air is admitted 15 stantially remains until the fuel has reached the
to substantial extent, namely, at the bottom of
?re zone, where the volatile matter remaining is
the column and immediately surrounding the
consumed along with the solid fuel. With this
periphery thereof, and the primary air'will pass
invention it has been proven that the central vol
out through the ?ue 30 at the bottom, drawing
ume of the fuel in the magazine remains rela
offthe liberated combustible gases from the fuel.
tively cool and below the temperature that would
Su?icient secondary air is admitted at the point
cause the volatile to be discharged.
4| to support combustion in‘ said .?ue and in the
Therefore, this invention provides a magazine
stove that is substantially smokeless with ordi
tion of these gases before they are discharged
nary grades of ‘bituminous coal of the size of nut
from the stove. This results in a completely
and slack, ordinary stoker sizes, or larger; that is
smokeless stove since substantially no com
exceedingly efficient; in which the volatile matter
bustible particles are discharged through the ?ue
is burned mostly along with the solid fuel itself;
and a design in which the combustion rate of the
In- admitting the primary air at this low point
fuel can be controlled readily. It has been found
in the stove, while the ash pit is sealed at ['4 as 30 that the stove will idle and keep the ?re alive for
described above, there is substantially no tend
as long as'seventy-two hours with one hundred
ency for‘any of the gases of combustion to es
pounds of nut and slack originally ‘putinto- the
cape when the main top 8 is substantially re
magazine, and that at any time during this‘ period
moved because there is no upward draft through
the ?re can be made to supply its maximum heat
the mass of fuel in the magazine. Furthermore, ' very ‘shortly after damper regulation giving .the
there is substantially no escape of gases of com
required amount of primary air for full combus
combustion chamber 2; for complete consump
bustion when the ash pit door I4 is opened be
cause of the manner in which the air is drawn
If desired, a hot water heater maybe utilized
in at the side and the low point of ‘admission.
in connection with this stove, by , providing a
The air chambers l6 and 33 allow the pre-heat 4.0 water back around the air passageways, or in
ing of the primary and secondary air supplies
place of the ?re-brick 21, in a manner that will
before the air is admitted to the stove, and these
be obvious.
air chambers serve also to insulate the combus
Provision may be made in the stove forrelieving
tion and heating chamber 2 from the fuel maga
the side pressure on the magazine walls mechan~
zine. The relatively ‘narrow passageway through 45 ically, so as to let the coke bed settle down as fuel
which the secondary air is admitted to the ?ue 30
is consumed in the combustion zone, as shown in
at 3| provides a very simple and effective man
Figs. 7 and 8. In this form, the magazine drum
ner of admitting secondary air behind the baffle
5| is constructed with a combustion zone 52 in
formed by the ?re brick 38 which will cause the
the lower portion thereof, having the usual grate
secondary air to mingle withrthe gases of’ com 50 at the bottom, and surrounded by a ?re-brick
bustion so as to complete the combustion of such
ring 53 at the lower end of the fuel magazine.
gases and thus avoid smoking by the stove. The
A ?lling opening is formed within a dome 54,
downward projection of the ?re brick baffle or
having a removable cover 55.
arch 38 into the ?ue 30 also tends to prevent
The side walls of the magazine are formed of
the fuel from working its wayinto the combus 55 a plurality of metal plates ‘56, preferably of cast
tion chamber 2, and increases the velocity of the
iron, which extend downward in truncated coni
gases passing through the flue by reducing the
cal form, within the drum 5|. The upper ends
cross sectional area of the latter, whereby no ?y
of the plates 56 are formed with hooks 51'- which
ash lodges on the arch in a way that would be
detrimental through accumulative effect.
Two different designs are described herein
where the magazine has rigid side walls, one be
ing illustrated in Figs. 1 to 5, and the otherv in Fig.
6. In actual practice with this invention, using
ordinary nut and slack bituminous coal, it has
been found that in the design shown in Figs. 4
and 5 of the drawings, we can fill up the magazine
, engage over a surrounding ring 58 carried by
brackets attached to the dome 54, thus .pivotally
supporting the plates thereon in downwardly in
clined directions, with the lower ends of the plates
56 bearing upon the upper edge of the ?re-brick
ring 53. The angle of the plates 56 to the vertical
axis should be such that the plates will hold the
side pressure of fresh fuel supply, but will swing
outward in a laterally expanding. action when
with bituminous coal, after having started'a fresh
the heat of combustion in the stove causes a swell
?re, and we'will have smoke for about ?fteen to
ing action of the coal.
twenty minutes, but the percentage of smoke is 70
The plates 55 are‘ (provided with ribs 59 ex
very small, and it will pass the tests of the usual
tending vertically along edges thereof, and these
smoke ordinances in cities that are trying to
edges are arranged in overlapping relation, as
eliminate smoke from the air. Furthermore, this
shown in Fig. 8. The edgeof one plate 56 is bev
original ?ring, since it takes place usually only
eled at 60, forming a feathered edge thereon, in
- once .or twice during, the. winter months, is rela 75 position to overlap an angular corner 6|» on the
adjacent section, which rrangement effectively
combustion of the products
seals the joint therebetween, substantially pre-‘
Venting ?ne coal from passing through thejoint,
but if any coal should work through, it would
drop into the combustion zone.‘ The‘ shape of
of ‘combustion pass
3. A magazine feed stove comprising a fuel
magazine structure adapted to- contain a column
of'fuel therein with a zone of primary combus
‘ tiori at the’ bottom thereof, a bottom structure
this joint ‘between the sections will tend to pre
for supporting the column 'of'fuel in themaga
zine, a bottom flue ‘extending laterally from the
vent the'collection of any ?ne coal therein, as
well as any undue leakage resulting from the
fuel magazine and having ‘an intake end con
lateral expansion of’ the plates 56, due to the
swelling action of the heated coal inthe-maga 10 nected with the magazine at the zone of primary
combustion for discharge vof the products of com- / ,
bustion through the bottom ?ue,-means for sup
plying secondary air'to the bottom ‘?ue to ,sup
port secondary combustion of the products ofv
The plates 56 are shown as formed with holesBZ
therethrough for admitting primary air around
the outerportion of the fuelmagazine',‘ as 'well
as at the bottom edge of the ?re-brick ring 53, if 15 combustion passing therethrough, means for ad
mitting primary airtt'o the-fuel magazine at the
periphery thereof adjacent the zone of- primary
combustion to support‘ said primarycombustion,
and. additional means spaced above said primary
throughoutt-he major \portion of the height of the
air ‘7 admitting means for supplying air_to the
fuel magazine,-especially where the expanding 20 periphery
‘of the fuel magazine above th‘ey‘zone
walls of the fuel magazine are used as shown‘ in
of primary combustion to supply oxygen to sup;
Figs. 7 and 8, which will allow the'fuel bedto set
port combustion at the periphery-of the fuel
tle down in the combustionzone as the) coaliis ’ column with substantially no combustion at the
burnedtherein, ‘Nevertheless, it is desirable'to
center of said column of fuel at thesame level,
admit the primary air to the fuel bed above ‘the
whereby before combustion takes place in the
desired, to keep the fuel bed burned away from
the plates as described above. However, it may
not be necessary to provide such air holes
combustion zone,’ in order to obtain a substantial
ly smokeless stove, in addition to the admission
of some primary air through the ‘fuel being con
sumed in' the combustion zone. Such 'an ar
rangement causes burning of the volatiles, as they
are released by the heated coal in the fuel bed,
and ‘yet the volatiles are not expelled too rapidly,
center of the‘ fuel‘ column- the peripheryof'the
column at; this‘sa'me; level is burned away from
the surrounding walls in a fashion that permits
4. A magazine heating stove comprising a fuel
magazine having surrounding walls adapted to
but pass through the combustionizone gradually.
l. A process .,of burning bituminous coal in a
the fuel column as a whole'to settle. down into
the combustion ‘zone as'the fuel therein is con
35 contain-a fuel‘column in‘ the magazine, a fuel- '
supporting bottom ‘structure beneath" the maga
zine forlsupporting the fuel column for primary
stove having a fuel magazine with surrounding
combustion of the fuel in a zone above the fuel
walls, comprising supplying, acolumn of fuel in
supporting means, ‘means for supplying. primary
the fuel magazine, producing a layer of incan
descence by primary combustion of the fuel'in 40 air to‘ the periphery of the fuel column adja
cent the zone of primarycombustion from a space
a zone adjacent the lowerend portion, of the
externally of the fuel columnrto support the pri
fuelmagazine, introducing the primary air into
mary combustion, and means for introducing pri
the magazine only above the lower end of the,
fuel column at the periphery thereof with a por
tion of said primary air introduced adjacent the
zone of primary combustion, and the remainder
mary air into the fuel magazine substantially
45 throughout the periphery thereof and along the
of the primary air introduced at the periphery
height of the fuel column, said primary air ad
mitting means being arranged to supply the pri
of the fuel column along a substantial portion- of ‘
mary air to the fuel magazine directly from ex
the height thereof to supply oxygen to support
. combustion at the periphery of the fuel col
ternally of the fuel magazine without passing
through the fuel'magazine to support combustion
at the periphery of the fuel column causing the
fuel to be burned away from the surrounding
level, whereby beforecombustion takes place in: walls and to .settle down as fuel is consumed
therebelow ‘in the zone of primary combustion.
the center vof the fuel column the periphery of
5. In av magazine-feed stove, the combination
the column at, this same level is burned away 55
from the surrounding walls in a fashion that per-I ' of a ,fuel magazine for containing a column of
fuel, means for: supporting the column of fuel
mits the fuel column as a whole to settle down
in ‘the magazine and. arranged. to provide a zone
into the combustion zone as'the fuel therein isv
of primary combustion at the lower end of the
2. A magazine
feed stove comprising a fuel, 60 fuelmagazine, meansforming a continuous sub
umn with substantially no .combustion in they
center‘ of the said column of fuel atthe same
magazine structure adapted to contain a column
stantially 'imperforate wall, about ‘the periphery
of fuel therein with a zone of primary combus
of the fuel magazine adjacent the lower end there
of and havingconstricted ori?ces at the ,lower
tion at the bottom thereof, a bottom structure
end thereof for admitting air into the zone of
for supporting the column of fuel in the maga
zine, a bottom flue extending laterally from the. 65 primary combustion, means formingopenings at
the periphery of the fuel-magazine substantially
fuel magazine and having an intake‘ end‘con
throughout the height thereof for admitting air ,
nected with the magazine at the, zone of primary;
into the periphery of the fuel magazine from ex
combustion for discharge of the products of com-v
ternally thereof, means forming one or more air
bustion through the bottom ?ue, means for ad-'-,
mitting primary air into the fuel _magazine at 70 spaces about the .fuel magazine, in communica
the periphery thereof adjacentthe zone of pri
mary combustion, means for supplying air to the
fuel magazine spaced ‘above said primary air ad
mitting means, and means for supplying second
ary air to the bottom ?ue to support secondary
tion with the openings and ori?ces for supplying
air to said openings and ori?ces, said ori?ces
being of appreciablyvsmaller. air capacity than
the‘ air space or' air spaces in communication
75, therewith,,1_neans for directing the products Of
combustion laterally frornsaidzone ofrprimary
consume the gaseous products of combustion pro
combustion, and means for admitting secondary
ducing a smokeless operation at such a reduced
air to said last-mentioned means to support sec
ondary combustion therein.
, >
rate of combustion.
9. A stove comprising a fuel magazine struc
6. A magazine-feed stove comprising a fuel
magazine structure adapted to contain a col
umnof fuel therein withan incandescent layer
at the bottom thereof, a grate structure for sup
porting the column of fuel in the magazine with
, ture, a bottom structure for supporting the fuel
the incandescent layer directly above the grate,
a bottom ?ueextending laterally from ‘the fuel
magazine and having an intake vend connected
with the magazine entirely above, the grate in
the fuel column in the magazine structure, a
?ue connected with the magazine structure ad
jacent the bottom structure for drawing the gase~
ous products of combustion laterally from a sub
in the magazine structure, conduit means hav
ing damper control means therefor and con
structed for supplying downwardly moving pri
mary air substantially to the entire perimeter of
position for discharge of thegaseous products
stantially uninterrupted portion of the perimeter
of the fuel column, said ?ue having the intake
thereof extending circumferentially of the fuel
column less than one-half of the total perimeter
of combustionithrough the ?ue above the vgrate,
means for admitting, primary air to the periph
ery of the fuel magazine through constricted pri
?ces directly above the intake end of the ?ue
in close proximity therewith, ,means for supply
thereof, said conduit means having one or more
constricted ports» in the magazine structure above
ing air to they periphery ofuthe fuel magazine 20'; the lower end thereof for directing the flow of
along the height of the column of fuel therein
primary air against the perimeter of the fuel
and including openings disposed substantially
column and having one or more additional ports
throughout the periphery of the fuel magazine,
means externally of the fuel magazine for sup
plying air directly to the ori?ces and openings
without passage through said magazinehand
thereto in position to be adjacent the ?re zone,
said port or ports being so located and con
25 stricted that upon full opening of the damper
means for maximum capacity a major portion of
the primary air is directed to the perimeter of
the fuel column above the ?re zone and when
the stove ‘is being operated at a low heating
means for supplying secondary air to the bottom
?ue to support secondary combustion of the prod
ucts of combustion passing therethrough.
'7. A, magazine-feedstove comprising a fuel 30 capacity the major part of the primary air passes
magazine structure adapted to contain a column
through the conduit means 'to "the constricted
of fuel therein, said magazine structure having a
port or-ports at the bottom of the magazine struc
surrounding wall ‘adapted, to enclose the fuel
ture and directly above the entrance to said ?ue,
column, a bottom fuel-supporting structure at
whereby the perimeter of the burning fuel column
the lower end_0f said wall adapted to con?ne ,a
. adjacent thereto is supplied with sufficient 'pri
combustion zone therein adjacent, the bottom
mary air'topromotefull- consumption of the fuel
end of the magazine structure, said wall having
at this ‘point.
vertical air passages therein with slots connected
therewithand extending upwardly in the fuel
magazine substantially throughout armajor por
tion of the height of said magazine, said air pas
sages being closed externally and extending down
wardly directly to the combustion zone and hav
ing air inlets into the magazine at the com
bustion zone of appreciably smaller capacity than
said air passages, and means for supplying air
into the upper ends of said passages independ
ently and externally of the fuel magazine with
out passing through said magazine for ?ow‘
through said passages directly to the inlets at
the combustion zone and for ?ow through said
slots for admitting air therefrom into the pe
riphery of the fuel magazine.
8. A stove comprising a magazine structure
having a grate for supportinga column of fuel
therein, conduit means for supplyingprimary air
to said fuel column, including means for sup
plying air to one end thereof, and said conduit
means having constricted ori?ces capable of dis
charging therefrom a portion of the ‘totalitari
mary air of the stove when the draft through
said conduit means is fully open, and a ?ue hav
10. A down-draft magazine-feed heating stove
comprising a fuel magazine structure ‘for con
40 taining a column of ‘fuel therein, said structure
having an opening at'the topthereof for supply
ing fresh fuel by gravity ‘to the-magazinestruc
ture, a closure for saidopening and constructed
for sealing ‘said opening ‘against the entrance of
45 air therethr'ough when the closure is in place
over the opening, ‘a bottomstructure including a
grate for supporting T~the~fue1 in the magazine
' structure and including de-ashingmeans for sep
arating ashes'from ‘the column of fuel, and an
ash ‘pit belowrsaid fuel-supporting means, means
for gaining access into the ash pit to remove the
ashes therefrom and including an opening and
a co'vertherefor constructed for-sealing the open
ing substantially against the ‘entrance of air
55 thereto ‘when the cover is -in1place,' said closure
and cover'being constructedto prevent thev ad
mission of» air'to the fuel‘ magazine and ash-pit
during operation’ except whenifuel is being 'sup
plied to the magazine or ashes are being'taken
60 out, means for introducing " primary air into the
magazine structure "at points wholly ‘above the
level of the bottom strueture,-and a'?ue extend
ing laterally from the fuel magazine "in com
munication therewith above 'thegrate for con
ing unrestricted communication with the maga
zine structure for directing products of combus
tion therefrom, said constricted ori?ces being 65 veying the gaseous products of combustion lat
arranged for introducing the constricted ‘supply,
erally ‘away from the burning fuel, the‘ air sup
of primary air to the vertical outside wall of'the
ply and air introducing means‘rbeing constructed
fuel column adjacent to the unrestricted ?ue
for introducing at least a major portion ‘of the
leading therefrom, whereby when the draft is
primary air to'the perimeter of the~fuel column
reduced appreciably from the full draft of nor
mal combustion the said'primary air supply in
troduced through the ori?ces to the periphery
70 at points substantially ‘above "the level of the
horizontal'plane'of the top of the ?ue-adjacent
the fuel» column, means for introducing-secondary
of the fuel column will enter the magazine struc
air into ‘said ?ue, and separate-means- for con
ture and produce combustion of the‘periphery'of
trolling the primaryand secondary vair-introduced
the fuel column with sufficient temperature to 75 by the respective means.
2,403,8292 I
tomi?ue extending Zbetweenthe lower endpora ‘
11-.‘ LA 7 magazineefeed; ‘stove 7. comprising a, .1 \fueli - '
tions 'of the fuelmagazine and the. combustionv
magazine structure adapted to contain a column
chamber and, in openicommunication therewith.
of, fuel therein with an incandescentlayer at
for. directing combustiblev gases from said maga
the, bottom thereof, ar;bottom fuel-supporting;
zine to said chamber, an air chamberrhaving
structure for supporting thefuel in the maga
means-for admittingrair thereto on;.a horizontal
zine structure with the incandescent layer direct
level at the lower portion of the fuel magazine
ly above said bottom ;struoture,_a ?ueforcon
andabove the bottom'?ue, means for circulating
veying off the gaseous products of combustion
primary air from'said air chamber downwardly.
and having‘anintake endconnected with the,
externally of thefuel magazine about the periph- ‘
magazine. structure wholly at, a point above they
ery thereof and. admitting: said airto the maga
bottom structure intposition for the discharge of’
zine at a plurality of points-along.the height
gaseous products ofico'mbustion entirely above the
thereof and adjacent the ?rst-mentioned an: ad-; .
bottom structure, and. meansifor supplyingiprii
mary air to; the magazine, structure and opening. 1‘ mitting means .to support .combustion'in._.said
into. the magazine structure directly above-and 15rv magazine and around the walls'thereof; -v . f
' 1 1515. In a‘ magazine heatingrstove-the combinae
in ' close , proximity : with “the. intake, end: of, the
flue,-v said air supplyingmeans having anrintakef
tionbfa'fuel magazine adapted tocontainga
end substantially 1at; thesame level as the incane
column of'fuel therein, a combustion chamber '
‘spaced laterally from the fuel magazine,'a line
20 extending between the lower end portions of: the
fuel magazineand the combustion chamber and
:12; 'A'down-draft ,magazine-feed stove com
descentlayer of fueliatthebottomof. the maga
column of .fuel ‘therein, .a bottom fuel-supporting
structure for supporting the fuel in the maga
in open communication therewith for directing
combustible gases from said magazine to said
chamber, means for admitting primary air to the
berefrom the magazinestructure; a bottom ?ue
around, the walls ‘thereof, said air’ admitting
prising a‘ magazine structure for; containing a
zine structure, ‘a {combustion 1 chamber beside the 25 fuel magazine about the periphery thereof and‘
at a plurality of points along; the height thereof
magazine :structure and spaced; laterally‘ there- '
to support combustion; in said magazine. and
_ from, meansfor insulatingthe combustion» cham
for;_ convent-1g:theL gaseous; products ,oftcombus-qj ' means: being constructed of constricted ori?ces‘
' tioniflaterally from 5 the magazine structurev ené, 30? and
to ‘the combustion chamber, and means for .lsup
16. In amagazine heating stove,v thercomb'i-r
plying ‘to the/magazine» structure all of the ;pri
mary air at: the peripheral portion‘ of the ,maga
zine -_ structure at points abovethe bottomfuel
nation ofa. fuel magazine adapted to contain a‘
column of fuel therein, a combustion chamber
spaced laterally from the fuel magazine, a ?ue
s?pnortihg structure; said airsupply meansbeing
extending between the lower end portions of the?
constructed with means for admittingair~ at a'
combustion zonev adjacent thebottom of the fuel
magazine and‘ arranged for passage of air exter t I
‘ v‘to
of the-‘fueltma'gazine to saidt __air admitting
‘ means, whereby thetemperatureof the fuelin
the upper part of the magazine structureis main
tained by said’ air'suf?'ciently'low to prevent the
fuel from expanding andadhering ‘to the side
walls of the magazine structure‘, __
having downwardly "extendingpassageways
communicating with the ori?ces at a series of.
vertically spaced: points about the magazine. .
tlI'ElYiabOVajhQ bottom fuel-supporting structure
fuel magazine and the combustion chamber and
in open communication therewithfor directing‘
gases from-said magazine
chamber, means for‘admitting primary air-to the
fuel magazine aboutv the periphery-thereof and
at a plurality of points along the height thereof
to support combustion in said magazine and.
.around the walls thereof, said air admitting
means being constructed’of constricted ori?ces
13; ,_A downédraft magazine-‘eed heating stove
comprising “ahfuel magazine‘ for'jcontaining a col
umn’of’bituminous‘coal therein‘, a de-ashing bot-'_
tom structure'for supporting the coal in the
andv having ‘downwardly extending‘ passageways
communicating with the ori?ces at a series of,
Vertically spaced points. about the‘ magazine with .
‘the lowermost ori?ces spacedvabove the?ue, and »
magazine structurefan ash pit vbe'lowsaid de
through,v said‘ ash pit having an‘ access opening
means‘for admitting primary air into the upper
ends of said passageways for downward circula-
thereto,‘ a cover for closing said opening against
tion therethrough to the ori?ces. '
ashi'ngs‘tructure for receiving the ashes-there
the "admission vof air ‘therethrough; and means
for'supplying primary air‘ downwardly in the‘ fuel >
17'. In a magazine‘heating stove, the combina
tion of .a fuel magazineadaptedto contain acol
magazine throughout a sub'stantial'lportion of the
height thereof and‘having'lan'opening into ‘the
magazine directly above the‘ bottom structure
umn of fuel therein; a combustionv chamber
spaced laterally from the'fuel 1 magazine, a ‘?ue -
extending between the lower end portions of the
fuel magazine and the combustionchamber and
and including a conduitextending thereto, means
forming'an exit ?ue and'openltofthe magazine
in open . communication therewith I ‘for , directing
structure at a side thereof entirely above the de
ashingibottom in such position ‘that none of the
combustible gases from said magazine to said
combustion chamber,‘ an air chamber interposed
gaseous‘products ‘of combustion pass through the’ I
betweenjthefuel magazine and the :combustion
deeashing structurev in .moving to' the exit ?ue,
said; airsupply‘ conduit :havingv ant-air inlet lo
chamber ' and- ' extending '7 substantially from 'side
cated adjacent; to a: horizontal plane through the
to side thereof insulating said magazine and’
combustion chamber from each other,‘ means for
top, of the bottom structure in such‘ position that
admitting 'cold air into said air chamber at a point
adjacentithe bottom of thefuel magazine, and
means for circulating air from the‘top of said air
combustion from the_magazine-when the ash pit 7 0. ‘chamber abovei'the magazine downwardly exter
nally ofvtheair chamber about the periphery of
there will be no ‘tendency for back draft -upward-'
ly through the fuel zone _of gaseous products of‘
‘>147. :Ina Vmagazine ,heating. stove,’ the combi
nation of a’ fuel magazine adaptedto contain a‘ _ ‘
the ‘ magazine to a
point adjacent the bottom»
whim-1 of fuel therein, a lcomhustiimr chamber i ‘11.8; In amagazinelheating stove, the combina-~:v
spaced; laterally from :tbetfueltrnagazinaa bot; > .',t1on of-anzu’pright' fuel magazine'adapted to con» ~
taina column of fuel therein, a grate at the bot.
tom of they fuel magazine substantially within. the
con?nes of. the wall thereof for supportingsaid.
column of: fuel, an uprightcombustionchamber.
disposed beside the fuel magazine and spaced‘.
bodily therefrom, a flue extending laterally. be.»
tweenethe lower ends ofthe fuel'magazine and.
combustion chamber and‘in opencommunication
therewith only above the grate arranged for pas.
having means offconnnunicationfrom/she air pas
sageway extending..therethrough into the fuel‘
magazine, said-‘channel. members» being spaced
apart-rwithithe spaces therebetween open into the
. fuel magazine.- and having means. of communica
tion through the- sidewalls; thereof from the air
passageways - into. said 1- spaces.
23. A magazinefeed-stove: comprising a. fuel
magazine forcontaining a column of fuel therein
sage of gaseous products of. combustiontolthe 10'. and having asurrounding wall .- structure, said
?ue entirely above the grate. without passing
wall structure: including-a surrounding..-enclosure,
downward. through the grate, means for admit-e
a plurality’of channel members spaced at inter
vals_ about the enclosure, each of I said channel
ting primaryair to the: fuel magazine. at:a.>p.oint,
wholly above said fine to. support combustion in.
members havingan inner wall facing the interior
the bottom .of said magazine and at higher points 15. of I the magazine with‘sideg?anges vdirected toward
at the peripheryofthefuel magazine. below. the
the enclosure and. forming an air» passageway
top thereof for discharging. combustible. gases
therethrough- extending; lengthwise of- the‘ fuel
through said ?ue and to cause settling. downy-of
magazine, aii-reebrick extending about theilower
bituminous coal in .the. fuel magazine with'outade portion of. the~fuel magazine. and having. pas-l
hering to the surrounding wall of the magazine, 20; sageways therethroughv in alignment with. the
andmeans for, admitting secondary air-into the
channel passageways in open communication
top of said ?ue for combustion of said gases.
therewith and extending to points within-the fuel
19. In a magazine. heating stove, the combina
magazine: for. supplying: air, to the-column of fuel.
tion of an upright fuel magazine adapted to con
tain acolumn, of fuel therein, an upright com 25.. 24. A‘ magazine feedv stove comprising-1a fuel
bustion chamber disposed beside the fuel maga»
magazinefor containing acolumn of ‘fuel therein
zinc. and spaced bodilytherefrom, a ?ue extend
and'having» a surrounding walllstructure,‘ said,
ing laterally. between the lower ends of the fuel
wall structure‘includingcatsurrounding drum, a
magazine and combustion chamber and inopen
pluralityof ~ channel members-spaced- at. intervals
communication, therewith, means for admitting '30 about. the drum, each of saidchannel members
primary air to the fuel magazine ata pointwhol
having an ‘inner wall facing the-interior of they
1y above said ?ue to support combustion. in the
magazine with Y‘ side i?anges-v directed ~ toward the
bottom of saidmagazine and for discharging com
drum and‘ forming an air» passageway there
bustible gases through said flue, a ba?le extende
through extending- lengthwise of a the fuel maga
ing. transversely .of said ?ueand projecting down~ .
zine, a ?re-brick-lining extending-about-the fuel
wardly below» the top thereof, and ‘means for ad»
magazine and supporting" thev channel members
mitting secondary air into .the top ofsaid ?ue be
thereon, said- ?reebrick lining having- grooves
sidesaid .ba?ie and'betweensaid ba?le and‘ the
therein in’ alignment with the passageways in ‘the
fuel magazine for causing. intermixing of . said
channel members in open. communicationithere
air with the combustible. gases..
with, and extending to "the inner-surface of said
20. Amagazine-feed stove comprising a maga
lining for supplyingairjto' the column of fuel in
zine structure for containing a colum-noffuel,‘
the magazine, and .means slidably receiving. and
saidmagazine. structure. includinga plurality. of
upright channel members arrangediat intervals.
mounting the channel membersin upright posi
structure forming a preheating chamber between
said partition and the magazine-enclosure having
tions within the drum.
about theperiphery of the fuel magazinewith
25. A magazine feed stove comprising a fuel
openings between the channel members forming
acolumn of fuel therein
air'passageways in open communication with the
and having. a. surroundingenclosure, a heating
interior. of themagazinev structure, said channel
structure disposed beside the fuel magazine and
members having means of. communication from
the air; passageways therein into lthe'openings, 50 connected with the. ?rst-mentioned enclosure, a
partition extending. transversely of the heatingv
and means for supplying air, into.
21. A magazine-feed stove comprisinga.imaga-.
zine structure for containinga columnoffuel,
said .magazine structure including‘ a plurality. of 65
upright channel members arranged at intervals
about the peripheryof the fuel magazine with.
said channel members spaced apartitoprovide
spaces therebetween with slots opening. .from said
spaces into the periphery of the-fuel magazine
and said slots, being elongated in an upward di-:
rection throughout a ,substantial'portion of. the
height of said magazine, thesidesof the channel
means forradmittin-g air. thereto, said fuelmaga
[zine having a» plurality of. air inlets about the
periphery thereof, means forming one or more
passageways extending. downwardly to‘ said air
inlets from the-upper end portion of said maga
zine enclosure and ‘being in open communication
with the preheating chamber.
26. A magazine feed stove comprisingra fuel
magazinefor containing a‘column of fuel therein
members at opposite sides-,of‘the spaces converg
and having a surrounding wall structure, a
heating. structure. connected with the wall struc
ing toward said slots inwardly relativeto the-:m'ag
ture and extending laterallytherefrom enclosing
azine,v so that lumps of coal‘ that: may pass
a heating: chamber, a partition extending trans
through theslots will‘ not'clog. the spaces, and‘
means for admitting airinto said ‘spaces for sup
ply to the fuel magazine,
22.'_A magazine feed stove comprising a fuel
magazine for containing a column of fuel therein
and having a surrounding, wall'structure, said.
wall structure including a plurality of channel
members arrangedaboutithe. periphery of the
versely of the. heating. structure spaced from the
wall‘structure‘ forming. a preheating‘ chamber
nected with said ‘preheating chamber for sup
plying air therefrom through theawall structure
to the inner periphery of-the fuel magazine for
supporting combustion therein, a ?ue connecting
the loweriend portions of the :fuel magazine, and
fuel. . magazine, _ each; of .; said‘... channel .: members 75
the-heating chamber; andmeans for ladinitting
therebetween having an: air- inlet, means con
secondary air to said ?ue intermediate the fuel
magazine and the heating chamber.
27. A magazine feed stove comprising a fuel
magazine for containing a‘column of fuel therein,
a heating structure disposed beside the fuel
magazine, means forming a ?ue connecting the
lower end portion of the fuel magazine with the
heating structure, and secondary air supply
forming a combustion space, a fuel magazine
thereabove adapted to contain bituminous coal
and arranged for discharging the same by gravity
' into the combustion space automatically as fuel
is consumed therein, and means for introducing
primary air above the combustion space for
downward movement thereto in part through the
fuel supply in the magazine, whereby the down
draft carries the volatile matter produced in the
means intermediate the heating chamber and the
fuel magazine, said air supply means including 10 lower portion of the fuel supply into the combus
tion space without heating all of the fuel in the
wall structures enclosing an air'preheating cham
magazine su?iciently to volatilize "it completely
ber, one of said wall structures having a ledge
until it has reached a location adjacent the com
connected therewith and the opposite wall struc
bustion space, said fuel >magazine having side
ture having a shoulder connected therewith, a’
?re-brick having one side seated on said ledge 15 walls thereof constructed for lateral expansion to
reduce the pressure of the coal against said side
and having one or more ribs extending laterally
walls when the coal is swelled by the heat of
from the opposite side thereof and seated on the
shoulder’ for supporting the ?re-brick there
\' combustion in the stove, whereby the coal will
settle by gravity into the combustion space as
between, said shoulder having the inner edge
thereof spaced from the adjacent side of the ?re 20 coal is consumed therein.
brick forming an opening therebetween from the
preheating chamber into the ?ue. V
28. A magazine heating stove comprising means
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