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Патент USA US2126104

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Aug.‘ 9, 1938. ‘
w. M. FULTON
.
2,126,104‘
AUTOMATIC STOKER
Original Filed 'sefpt. 9, 1951
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2,126,104
V ‘I . Patented ,Aiug. 9,1938 1
v‘u1.~n'rla:ofsriifrlas- PATENT ,OFFICE-I'
‘
Weston M. Fulton,=Knoxvlllc, Tenn, assignor to‘
~
W. J. Savage Company, 1110., Knoxville, ‘harm, a
_ corporation of Delaware,
Application September 9, 1931, ‘serial Nascrsu ’
V
'
Renewed January 4, 1938
29
_
(01. 110-30)
This invention relates to heating plants, and
the emciency at which the fuel is burned. vWhen
the demand upon the stoker is great, the tendency
r ‘ more particularly to automatic stokers for ‘burn
ing solid. fuel.
’
, v
7
Ithas previously been proposed to provide if
- is for fuelto accumulate in the burner to a depth
-
ll naces burning solid fuel, such as coal or coke,
with fuel magazines or, hoppers which, as long
as they are kept supplied with fuel, provide, ‘a
which is too greatto permit of complete combus
tion, 0n the vother hand, when the demand is _
slight, the fuel bed has a tendency to become so
thin that the amount‘ of air passing through it '
continuous, gravity feed of fuel to a burning zone _-is greater than can be consumed by‘ the fuel, and
within the furnace to which air is admitted by the causes a. cooling effect with consequent loss of
10 usual dampers and through suitable tuyeres, the
ashes-being deposited in an ash pit within the
furnace whence they may be removed manually.
Other stokers have also been provided wherein
the fuel is fed mechanically, as by a moving grate
15 or a screw conveyor, and combustion is facilitated
by a power driven air blower. Still other forms
of automatic heating plants have been suggested
heatIunits' Secondly, in these automatic stokers 10
of the prior art the combustion chamber and '
tuyeres are located in the fire box of the furnace
or heater itself which makes it' di?lcult to re
move the ashes and clinkers, and also increases
the tendency for fine ash to accumulate in the i5 ,
?ue‘s vand smoke pipes of the furnace. Thirdly, ‘
the tuyéres around the combustion chamber are
dependent entirely upon the incoming air to cool
mechanically fedainto a burning chamber, air them below the fusing point with the result‘ that
20 being supplied under pressure to said chamber if the combustion chamber becomes accidentally 20
through 'tuyere blocks supporting the fuel bed, clogged, or if the air supply is insufficient, the tu
and suitable automatic. temperature responsive - yere blocks are often burned out. Fourthly, feed
control devices being provided for controlling the ' ing' mechanisms previously known have often
wherein fuel is supplied from a'magazine and
supply of current tothe motorrwhich actuates - times become clogged by oversize pieces of fuel
or other foreign matter, such clogging resulting '25
25 boththe fuel feeder and the air blower.‘
All of these prior devices, however, possess ob-v either in a breakage of some of the parts or in
Jectio'nable features which it is "the object of the
present invention to overcome. The earlier type
gravity feed magazine furnaces were particu
30 laryobjectionable because irregular, holes or cave
ities‘would burn through the fuel causing it to ,
the temporary stoppage of the stoker. Still an
other serious di?icultywhich has hitherto been
encountered‘ with stoklng devices has resulted
from a persistent tendency of the coal or other 30
fuel to bridge or arch at the ‘discharge outlet of
arch over the cavities and fail to feed down-'
the hopper. When this arching occurs, no fur
wardly, and there was also often a tendency for '
ther fuel feeds down into the combustion cham
smoke to pass upward through the magazine and
35 escape around the edges of the magazine door,
ber or conveyor until the arch is broken up.
It is therefore one of the objects of the present 35
this being especially true when the fuel had fed ‘ invention to provide an automatic, stoker. for
down low in the magazine to a point where the
thickness of the fuel above the burning zone was
i very slight.
Other difficulties experienced with
40 thistype of furnace included the escape of volatile
matter from the fuel and its deposit on and‘
around the magazine door, the ‘clogging of the
solid fuels which is certain and efiicient in opera
tion, simple and rugged in structure, and free ,
from the defects common to devices of this char
acter previously known to the art.
Y
40
matic stoker. and furnace fora heating system
a, a
which includes a combustion chamber and ash
them atv proper intervals,- the necessity for a disposal means which are entirely disposed out
45 strong chimney draft, and the limitation in ca- ' side of the lire box of the ordinary furnace or 45
pacityof the'fuel magazine to the size ‘of the boiler, and which can be readily connected‘to any
existing heating plant with a minimum of recon
. _ furnace since the formerwas providedv as an in
burning zone with ashes dueto failure to remove
tegral part of the latter.
,
Similarly,- the power driven stokers heretofore
50 known have also been subject to various'obiecl
tions, including some of those mentioned in con
. nection with the gravity feed type. For example,
great difficulty has hitherto been experienced in
.
Another object is to provide a combined auto
struction and rearrangement work.
.
A further object is'to provide a combined auto
matic stoker and furnace wherein the fuel bed is .50
continuously maintained at a. predetermined
thickness and air is supplied thereto under pres
sure on the cross draft-principle.
\
Still another object is to provide an automatic
maintaining a burning zone or fire bed of uniform
55 thickness, this resulting in wide ?uctuations in ' stoker embodying novel‘ feeding mechanism for 55
2
2,126,104
.
Fig. 7 is an end view looking from the. left at
the element of Fig. 6;
continuously agitating the fuel bed and moving
it so as to prevent irregular burning and arching
of the fuel, together with novel means for con
veying the fuel from the hopper or magazine to
Fig. 8 is an elevation similar to Figs. 4 and 6 of
one of the front intermediate elements of the
combustion chamber;
Fig. 9 is an end view looking from the left at
the combustion zone.
A still further object is to provide a stoker hav
ing a combustion chamber adapted to operate on
the cross draft principle, the tuyeres of which are
the element of Fig. 8;
continuously cooled by the heating medium" of
‘
10 the heating system itself.
Another object is - to provide an automatic
stoker with novel combined manual and auto
_ Fig. 12 is a front elevation of the fuel feeding
mechanism of the embodiment of Figs. 1-3;
Fig. 13 is a sectional view taken substantially
on line Iii-I3 of Fig. 12; ,
, Fig. 14 is a top plan view of the fuel hopper of
matic adjusting means whereby a predetermined
relationship is constantly maintained between
the amounts of air supplied» ndl fuel fed to the
combustion
chamber.
-~
7
~
~
I
>~
-~
V
Fig. 10 is a sectional view taken substantially
on line Iii-l0 of Fig.7;
.10
Fig. 11 is a side elevation of Fig. 10;
‘I the embodiment of Figs. 1-3;
-
A further object is to provide an automatic " . Fig. 15 is an isometric view of one of the slid
ing agitator plates;
stoker with novel ash disposalmeansof ‘simple,
structure which continuously and automatically" ' ‘Fig. 16 is a horizontal section, with certain parts
removes the ashes from the combustion chamber shown in full, of the fan shown in Fig. 1;
Fig. 1'7 is a sectional view taken on line ll-l'l
of the stoker.
.of Fig. 16 and turned through 90°;
1 . Another objectis to provide novel. agitating ,
"
means‘ for feelers. of the hopper typeywhich effec
tively prevent‘ clogging of the feeder ‘due to
arching . at . the outlet thereof -.of the material
beingzfeda"
_
._
a
V
.7
18 is a vertical sectional view similar to
Fig. 3 of another embodiment of the present in-@
vention;
'
.~ vFig. 19 is a front elevation of still another em
i
bodiment of the present invention;
A- still further, object is to ‘provide an automatic
stoker embodying-a combustion chamber-of novel
Fig. 20 is a partial side elevation of the em
‘
structure, built-up from a‘ plurality of -, individual _ ,bodiment of Fig. 19;
, 'Fig. 21 is'a sectional view taken’v substantially 30
‘on
the center line of the stoker shown in Fig. 19;
the
provision
.of
a
I
‘
Still other objects include
hollow-walled sections."
.
' novel auxiliary thermostatic control for periodi
and
'
Fig. 22 is a sectional view taken substantially
cally starting’ and stopping the stoker independ
on the line 22—22 of Fig. 21.
ently of the normal thermostatic. controls and
'
»
‘Referring now to Figs. 1,2 and 3, there is dis
‘without heating the building, novel‘ dust trap.
35
, closed therein a heating plant orlsystem com
bustion chamber is collected and prevented from prising a boiler and a novel combined automatic
means wherein ?ne ash blown through the com
stoker and furnace detachably connected thereto,
fouling the ?ues and smoke pipes, ‘and novel
means for deadening the noise produced by the
thev stoker not only including fuel supply and
feeding means but also having a combustion 40
chamber which is exterior of the boiler, thus
greatly simplifying‘ the disposal of ashes and
reducing the fouling‘of the heating surfaces and
blower and other high speed parts of‘ the ap
paratus...
L1
,
\_
t
_.
»
._
‘
.
These and other objects will appear more fully
from. a consideration of the detailed description
?ues of the furnace by ?ne ash and dust. This I
of the invention which follows.~-, Although sev
eral embodiments of the present invention have ‘embodiment of the present'invention also in
been described and, illustrated in the accompany- > cludes a novel combustion chamber operating on
ing drawings, it is to be expressly understood the cross draft principle and wherein a prede
that these drawings are for thepurpose of illus . termined thickness of‘ fuel bed is insured at all
tration only and are notto‘be construed as a ' times, means for utilizing the heating medium
50
limitation of the scope _of the‘invention', reference
being had for that‘purpose to the appended
claims.
of the system for cooling the combustion cham
her ‘and preventing fusion of the tuyeres, im
' proved fuel feeding means for feeding fuel from
a
In the drawings,‘ wherein like reference char- 1 the hopper to the combustion chamber, novel
means within vthe hopper for preventing arching
‘ acters indicate like parts throughout the several .
of the fuel at the outlet thereof. improved ash
views:
Fig.1 is a front elevation of one embodiment : ‘
disposal‘ means,- automatic ' regulating‘ means for
of the presenti vention showing an automatic . maintaining a ‘predetermined relationship'be
stoker connected _a steam generator or water, "tween the amounts of air supplied and fuel fed to
the ' combustion’ chamber, ‘ and novel thermostatic
heater of the-usual‘ type (and whichkforcon
60 venience will hereinafter. bereferred to by the
generic
term i‘~‘boiler")
'-.._con't'rol' means'for ‘automatically governing the
operation of the stoker for preventingextinguish
and'provided with-novel;
,
k
v
,
,
,
.
, ment of the fire therein during/short periods of
automatic thermostatic control means;
Fig. 2 is a side elevation looking front the left a; ,‘_ In the form shown. the heating plant comprises
‘at the embodimentofFig.11;'
’ .a boiler‘ 23 of any desired type and an automatic
65
Fig. 3 is a verticalllsectional‘viewvtakenrsuby' stoker ‘and furnaceQindicated generally at 24,
stantially on line 3-3 of Fi'gl.>2;'_
7‘ the principal‘element's of which are a fuel hopper
Fig. 4' is an elevation of ‘one of theen'd elements" . or magazine 25 from which'fuel is supplied to
"a novel
making up the sectional combustion‘ chamber of a combustion chamber or burner 26
fwarm'weath'er."
‘
70
Fig. 3;
60
,
.
'
‘
~
‘
'
''
~
65
"
fuel feeding mechanism 21, combustion being sup
70
Fig. 5 is an end view looking from the left at I ' ported in combustion chamber 26 by air which is
the element of Fig. 4;
. .
supplied under pressure from a fan or blower 28
Fig. 6 is an elevation similar to'lthatjof Fig. 4v through an air trunk or wind ‘box 29 totheburn
of one of the rear intermediate elements of the'v ing zone 30 of combustion chamber 28, the gaseous
.»
'
f _, products of combustion thenj passing through a 75
75 combustion chamber;
2,126,104 ’
conduit 3| into the'interior of furnace 23. In the
form shown, furnace 23 is of the hot water or
steam type having a water Jacket 32 through
which the heating medium circulates and in which
> 3
flow by gravity. As ‘indicated in Fig. 2, trough 7
43 is downwardly inclined/and is connected at its
lower end to a chute 53‘ which in turn discharges
through an opening in a cover 5| into a suit
it is heated, a supply pipe or conduit 33 leading ’ able removable ash can or receptacle 52.
Referring now to Figs. 12 and 13, there are
from the top of water ‘jacket 32 to the radiators ;
orheating devices disposed throughout the en-V‘v shown‘thereln in detail the novel fuel feeding
means of combined automatic stoker and furnace
‘closure being heated, and a return pipe or con
duit 34 connected to water jacket 32 at its lower 24 which are shown somewhat schematically in.
portion for returning the heating medium thereto. ‘Figs.- 1-, 2 and 3.v In the embodiment illustrated, 10
In the embodiment illustrated, conduit 3| ‘of the ‘rotatable feed drum 45 is provided at each end
stoker 24 is detachably connected to and delivers with a discqshaped v?ange 53, secured thereto in
anysuitable manner, between which ?anges are
the gaseous products of ‘combustion from com
bustion chamber 25 into the ash pit 35 of boiler housed the bottom or outlet end of hopper 25',
23', the hot gases then passing upward through ' semicircular housing member 44, and the forward "15
1 and around the heating surfaces 35 of the boiler portion of the bottom or inlet endof combustion‘
and exhausting through smoke pipe 31 to the chamber 25. Flanges 53 are preferablyxm'ade in
chimney or ?ue. As is evident from Figs. 1 and tegral with drum 45 and are provided with out
3, the arrangement of an automatic stoker and wardly extending central bosses 54 in which are
housed outwardly extending stub shafts 55, the 23
20 furnace detachably-connected to a boiler requires
very little reconstruction or rearrangement of .latter being journalled in suitable bearing bosses"
55 mounted on brackets 51 which are in turn sup
the boiler parts, it being necessary only to pro
vide a suitable opening 33in the sideof ash pit 35 ' ported by fa large base 53 on which the major
to receive the end of conduit 3|, and, if desired, portion of the stoker assembly rests. Flanges
53 are also provided with a plurality of inwardly
25 to provide the side of ash pit 35 opposite to open
111E238 with a baille 33, built up of ?rebrick or 'projectlng bearing bosses 53 which are cir
other suitable refractory material, for preventing cumferentially spaced around the inner faces of
the hot gases from injuring ash pit housing 43, said ?anges and so positioned with respect to
and also for deflecting‘the hot gases upward into drum 45 that oscillating shafts 53 journalled
therein will just clear the inside ‘surface of drum
30 the heating chamber of the furnace.
45. Rigidly secured to each of oscillating shafts
Referring" now more particularly to the com
,ponent elements of combined automatic stoker
and furnace 24, fuel hopper 25, which is prefer
63 are a pair of lever arms 5| to the outer ends
of which are pivotally secured the laterally spaced
" arms 52 of fuel feeding blades or‘paddles 53.(v In‘
the embodiment shown, four such paddles 53 are
' fuel may feed therefrom by gravity, and is pro - provided, and since they extend substantially
vided with at le'astgtwo gradually convergent diametrically across the interior of drum 45, arms
ably made of sheet iron or other similar ma
terial,-is substantially vertical in order that the
walls 4| and 42 which'form a comparatively re
' stricted outlet 43. vAt the lower or outlet end of
40 hopper 25, convergent wall 42 is suitably secured
-- in any desired manner to one end of a substan
tially semicircular housing or casing member 44,
. the other end of which islikewlse secured to the
inlet or bottom end of combustion chamber 25.
'45 Fuel feeding mechanism 21 is coaxial with semi
52 must be suitably spaced so as to allow move
ment of‘ each blade independently of the other.
Since, in its fuel feeding position, each blade 53
must extend outwardly beyondv the periphery of
feeding drum 45 into annular space 45 so as to
engage the fuel, suitable longitudinal slots 54 are
provided in the periphery of drum 45 through
which blades 53 are adapted to reciprocate.
'
Novel means are also provided for imparting
.a rotatable, drum 45 to the periphery of which "reciprocating movement to said blades as drum
45 is rotated, ‘said means being especially adapted '
convergent wall 4| of fuel hopper‘ 25 is substan
to make the outward extension of the blades
tially tangent at its lower or outlet end. ‘Com
yielding in character in order that breakage or
bustion
chamber
25
is
so
located
that
one
of
its
50
' wall's'is also substantially tangent to the periphery straining of the parts may be avoided should a
‘circular housing member 44, and is provided with
of drum 45 of the fuel feeding mechanism, thus
providing an annular space 45 between the periph
ery of drum 45 and housing member 44 into
55 which fuel is fed from outlet 43 of hopper.25,‘
through which it is carried by the‘fuel feeding
means later to be described, and‘from which it is
delivered into the inlet 41 of combustion chamber
As is shown best in Fig. 3, vinlet 41 of com
bustion chamber 25 is somewhat larger in. cross
'-section than annular space 45 in order to allow
blade strike unusual resistance, due'to foreign}
matter in the fuel, during its outward extension,
while the retraction of the blades is‘ performed
as a positive operation. As shown, oscillating
shafts 53 are each extended at one end outwardly
through one of ?anges 53 and have secured to
said outwardly extending ends suitable arms 55
on the ends of which are mounted suitable cam
rollers 55.v Rigidly secured to, and preferably 61
formed integral with, the bearing boss 55 on the
side of the feeding mechanism from which cam'
rollers 55 project is an arm 51 in the outer end
of-which is pivoted an oscillating cam member
The body of fuelthua fed to combustion cham
65 ber 25 is, due to the continuous underfeed from 53 counterbalanced by- a suitable counterweight
- feeding mechanism '21, moved‘ upward throughL 53 adiustably mounted on an arm 13 secured to
said combustion chamber, is burned in "burning said'oscillating cam member 53.
,the incoming fuel to .become mixed and agitated
at this point.
.
zone 33, and finally approaches the outlet or exit
43 of the combustion chamber as ash or clinker,
whence it is automatically and continuously re
As is shown best in Fig. 12, cam rollers 55 are ‘
adapted to engage the surface of cam member
53 in ,successionas drum 45 is rotated in a man-'
ner later to be described, and‘ the contour of cam '
the form shown, comprise a sheet metal trough ‘ member 53 is such that the travel of each cam
moved by novel ash disposal means which, in
43 which is secured to one of the walls of combus
tion chamber 25 and in communication with
75 exit 43 thereof‘, and into which the ashes over
roller 55 therealong'serves to rotate-the shaft 53
to which it is connected and thereby, through
lever arms 5|, move its associated fuel ‘ feeding’!
4
2,126,104
blade or paddle 63 from its inner retracted posi
“ tion, wherein the end of said blade is within the
router periphery ofdrum 45, outwardly through
slot 64, into contact with and ‘through the fuel
Whichqis fed-intoannularspace 48 from outlet
_48 of hopper 25 and into ‘engagement with the
inner surface of housing member 44. After cam
said chamber intermediate the ends is composed
of two pieces, a front piece indicated generally
at 19 and shown in detail in Figs. 8 and 9, and
a rear piece indicated generally at 88 and shown
in detail in Figs. 6, 7, 10 and 11. All of the inter
. mediate sections made up of 1 front
and rear
pieces 19 and 88 are assembled together in series
‘by suitable hollow nipples 8! which are screwed
I roller 66 clears cam surface", blade 63 is main
tained inits outward position through'its own ‘ into threaded bosses or openings 82. The inter
mediate sections thus assembled are then closed 10
10 inertia until it approachestheinlet or entrance to
combustion chamber 26. At this time, cam roller at each end by means of unitary side sections
, 68 contacts a fixed cam member ‘H rigidly secured indicated generally at 83 and shown in detail in
vto bracket 51 of the supporting framework.
;Movement of cam‘ roller 66 along cam surface 1|
15 gives a ‘positive counter-clockwise rotation to
- shaft 68 and withdraws blade 83 through slot 64
to ‘its fully retracted position within, drum 45
just before said blade reaches the inlet to the
combustion chamber.
Since cam member 68 ispivotally mounted on
20
arm 61, and although it is normally maintained
in a predetermined position by counterweight 89,
should the end of blade 63 strike foreign material
‘in the fuel in annular space 46 such'that un
25v usual resistance is offered to its outward exten
sion, cam member 88 will rotate about its pivot
and thereby provide a yielding pressure against
cam roller 86 rather than a positive force, and
allow blade 83 to ride over the obstacle encoun
30 tered until it reaches a point where it ‘can find
its way through the less resisting body of fuel.
Suitablemeansfare provided for driving fuel
feeding mechanism 21 at any desired speed so as
to feed; fuel to combustion chamber or furnace
26 in sufficient amounts to. properly heat the
enclosure in which the heating plant is installed.
.'As illustrated somewhat schematically in Figs. 1
and 2;‘an electric motor ‘I2, preferably of the con
stant speed type, is provided adjacent. the stoker
40 assembly and drives the fuel feeding mechanism
through a suitable speed reduction device.‘ As
bustion therethrough. For this latter purpose,
the front portion of each end section 83 corre
sponding to front pieces 82 of the intermediate
sections is provided with a plurality of V-shapcd 30
projections or lugs‘ 81 of the same height as ribs
86, separated at their bases by suitable spaces 88
which are adapted to act as tuyeres through
which the air supplied to the combustion cham
ber ?ows. Similarly, the portion of each end sec- .
tion 83 corresponding to the front legs of rear
pieces 80 of the intermediate sections is provided
with V-shaped lugs 89 similar to lugs 88 but with
their vertices directed in the opposite direction,
shown, the shaft of motor. 12 is connected to one
element of aspeed reduction gear train housed
combustion chamber.
mechanism driving, a worm gear 14 which is
rigidly mounted on one end of a shaft 15, on the
other end of which is secured a worm. ‘I6 which in
. . turn engages a-plurality of ,teeths‘l'l' forming a
, gear onrthe periphery of one of ?anges 53 of the
50 fuel feeding mechanism, so as toldrive drum 45
.r in a counter-clockwise direction,‘ as viewed in
‘ Figs. 1, 3 and 12. It will be obvious thatithe speed
As shown in Figs. 6 and '7, rear pieces 80 of the
intermediate sections each comprises a front leg 45
SI and a rear leg 92, both being substantially
L-shaped and joined at their upper ends, front
leg 8| acting as the rear wall of the combustion
chamber and the space 3| between legs SI and 82
forming the exhaust conduit through which the
hot gases of combustion pass from the combus
tion chamber to the boiler 23. Front pieces ‘I! of
at which fuel feeding drum 45 is rotated is very
the intermediate sections each comprises a single, I
. much slower than that at which motor ‘I2 rotates,
substantially vertical leg 98 which acts as the
front wall of the combustion chamber 28. Both .
front and rear pieces ‘I! and 80 of the intermedi
ate sections are provided with threaded bosses 82,
and that. anyvof ‘the well known types of speed
reduction mechanism may be‘ installed in casing
- " 18 in order to obtain this, reduction. _ Such mecha
' nlsm isv also’, preferably ‘provided with 'manually
operable, means such as a lever, 18 for changing
ribs 88, V-shaped lugs 81 and 88 and openings 84
the gear ratio of the speed reduction mechanism
1 andjthereby varying the speed at whichthe fuel
and 9| similar to those already described in con
,nection with Figs. 4 and 5. As shown in Figs. 60
10 and l1,‘each leg 8| is substantially triangular
* feeding drum 45 is rotated. . In: thefembodiment
in cross section and provided with a hollow space
\ shown movement of lever ‘llto'the right, as viewed‘
94 therein with which the openings in bosses 82
~> 8. in Fig. 1,;reduces ‘the specdatiwhich drum 45 is
rotated. _-,
, ' Referring nowto the detailedfst'ructure o‘f'com
\bustion ,chamber 28-, it .will be] seen from Figs.
33-11 that this. combustion'chamber‘or'burner is,
built up from, a plurality of hollow sections, pref
70. erablyofcast iron,_the sections being secured to
gcther» in scriesby a plurality of hollow nipples
-
space said sections the proper distance apart so as
to permitlthe flow of air and hot gases of com
between which lugs there are provided suitable 40
spaces 90 which act as tuyeres through which the
hot gases of combustion are exhausted from the
- in a casing or housing 13, the output end of said
~
‘Figs. 4 and 5. As shown in Figs. 4 and 5, end
sections 83 are provided with a solid outer wall
84 and an inner wall 85 from which project
threaded bosses 82, the space between outer and
inner walls 84 and 85 thus providing free com
munication between all of the openings in bosses
82 for the circulation of the heating medium in
20
a manner later to be described.
End sections 83 are also provided with inward
ly projecting ribs 86 which are adapted to‘abut
similar ribs formed on the adjacent intermedi
ate sections of the combustion chamber and to
communicate and through which the heating
medium is adapted to circulate. It will be under 65
stood that legs 82 and 88 of rear and front pieces
48 and ‘I! are similar in structure to leg 9|.
As previously indicated, suitable means are
' provided for circulating the heating medium of
boiler 23 inside of the various sections making up "
combustion chamber 28 in order not only to cool
‘which. are screwed intonsuitable threaded bosses ' the elements of this chamber, particularly the
or openings in each section. As shownin Fig. 3,
‘which is aseetional view taken intermediate the
ends of- combustion chamber v2i, eachsection of
tuyeres formed by lugs ll and 88 and openings 88
and 98, but also to increase the e?lciency'of the
heating plant by thus adding to the heat content
‘ 2,126,104
'
of the heating medium. As shown,‘ one voi’the
'
P
_
v5
In connection with this detailed description of _
intermediate sections of the combustion chamber, ' the combustion chamber 26, it will be noted that
is provided with a suitable inlet opening-95 and "a largernumber of outlet tuyeres 83, 96 have been
provided than‘ of. inlet tuyeres 81, 88, this con
outlet opening 96 to which are connected suit
struction being preferable ‘because of the in
and to water jacket 32, respectively. Inlet and crease in the volume of the gases asthey pass
outlet openings Y95 and- ,96 communicate with the . through burning zone 36 due partly to chemical
‘ able inlet and outlet pipes 91 and 98-1eading from
hollow space 64 within legs 9i and 92 of the par
.10
' combination and partly to expansion byheatr
It has also been mentioned that the combustion '
chamber is enlarged in cross section as itex 10
ticular intermediate section concerned, and the
heating medium which is thus supplied through
tends upwardly, this construction being prefer
able in order that ‘the increased thickness of the
pipe 91 and inlet opening 95 circulates inside of
all of the intermediate and end sections compris
fuel bed in the upper portion of the combustion
chamber will offer greater resistance to the pas
sage of air therethrough and thus force a greater
ing the combustion chamber‘ through‘ hollow nip
ples 8i and the circulating space in the end sec
15 tions 63 between walls 84 and 85. The tempera
ture of- the parts of the combustion chamber is
portion of air to pass through thelower portion
of the burning zone‘ where the greatest amount
of air is required to sustain combustion.
thereby prevented from running materially above
that of the heating medium in boiler 23.
I In stokers of the type described, dif?culty is
Referring again to Figs. 1, 2 and 3, it will be
'20
often encountered in properly feeding fuel from 20
the hopper because of a persistent tendency of
the fuel to bridge or arch at the discharge out
let thereof, no furtherfuel feeding down out of
the hopper when this arching occurs until the
seen that the space included between legs 93 and
it of the front and rear pieces of the intermedi
ate sections provides a combustion chamber of
de?nite size, two of the Opposite ‘walls of which
are gradually divergent from the entrance to the
25 exit thereof. Moreover, since the feeding of fuel
arch is broken up. ‘Novel means are therefore
to combustion chamber 26 by fuel feeding mech- - provided for agitating the fuel within hopper ‘2b
and therebycontinually breaking up any arch
which might be formed adjacent the outlet d6 of
said hopper. As shown in Figs. 1, 2, 3, 14 and
15, hopper 8b is provided with a pair of substan
tially rectangular, smooth surfaced agitator plates
anism 21 not only maintains said chamber full of
fuel at all times but also moves said body of fuel
through said chamber due to its underfeed char
30 acteristics, it is evident that the fuel bed thus
supplied is‘ of a uniformly increasing, predeter
mined thickness.
'
'25
30'
_ I162 'slidably mounted inside of said hopper ad
In order that most emcient combustion shall
jacent the convergent walls dll and t2. Plates
take place within combustion chamber 26, suit- ~ m2 are of substantially the same size as walls
35 able means are provided for supplying air under
pressure thereto in a manner'so as to create a
cross draft substantially transverse'to the direc
dll and d2 of the hopper and their lower edges 35
lie adjacent outlet it, said lower edges being pref
erably chamfered or sharpened as indicated at .
we. Plates on are pivotally fastened at their
As shown, and as previously described, V-shaped upper edges to links ltd which are in turn piv
lugs 81 and openings 66 in front pieces 1d of the: otally secured to a walking beam Illllb at points 40'
tion of- movement of the fuel bed therethrough.
‘ sections making up the combustion chamber
on opposite sides of the pivot M6 thereof. Walk
ing beam W5 is pivotally mounted on a suitable
‘cross member W1, which is secured as by brackets
supplied to the burning zone id of the combus
tion chamber 26. For this purpose, combustion ltd to the open ‘top of hopper it. One end of
.walking beam 116% extends forwardly over the 45
45 chamber it is provided with a wind box'or air edge of hopper 2b and is pivotally connected to
trunk 2d communicating with the inlet tuyeres
81, M, which trunk is supplied with air under the upper end of a connecting rod M6 the lower
pressure from a suitable blower or fan 28 through end of which is pivotally'secured to a ‘crank pin
a conduit 69. Blower W is directly connected to um carried by a crank arm till secured to an
oscillatable shaft M2 journalled in suitable bear
50 and driven by motor ‘if. Wind box 29 may, if
desired, be provided with a suitable cover ltd ings Md secured to the front wall 42 of hopper
form tuyeres’ through which air is adapted to be
which may be removed whenever desired for V
it,
tion within burning zone '36 are exhausted from
Shaft lid is also provided with a second‘
a crank pin ill carried by a disc lillt, the latter
being rigidly attached to the end of a shaft lid
inspection of the air‘ trunk and removal of any - crank arm Md having a crank pin M5 on which
is pivoted the upper end of a connecting rod lit,
‘ fine ash or dust which might collect therein.
the
lower end of vwhich is pivotally mounted on 55
v'JE'he
hot
gases
which
are
produced
by
combus
55
the combustion chamber through the tuyeres 6d,
96 formed in the" front legs @l of rear pieces ‘W
of the sections comprising said combustion cham
60 ber, and are conducted through conduit 3i into‘
, ash pit 3b of boiler 28 whence they flow upward
in contact with the heating surfaces 36 ofsaid
boiler and heat the heating medium in the usual
forming part of the speed reduction mechanism
housed in casing 13. The throw of crank pin ‘ll Ill
carried by disc M8 is preferably less than half 60
that of crank pin “5, so that as shaft H6 is
slowly revolved from motor 12 through'the speed
reduction mechanism, crank pin “6' and its as
sociated shaft “2 are given only an oscillatory
movement, which movement is in. turn trans 65
tial curvilinear velocity to the hot gases in con-‘ mitted to walking beam I65 thereby imparting
duit 3! thus increasing the tendency for any fine to agitator plates‘ I62 an alternate reciprocating l
ash or dust particles which might be entrained movement substantially. parallel ‘to the walls of
in the hot‘gases to be deposited in ash ‘pit 35 of ‘ hopper 25 andthe fuel contained therein. This ,
70 boiler 23 and on the bottom of conduit 3| formed alternate reciprocating motion of plates I62 gives 7/
‘ by the horizontal portion of L-shaped legs 9| to the fuel within the hopper adjacent outlet 43;‘
whence said. particles can be readily‘ removed where the arch attempts to form, a torsional/or
through ash pit door 166' of boiler 23 and an twisting movement which alternately raises‘and
auxiliary door |6l in one of side sections 83 of '> lowers the imposts of the arch and thereby com
pletely breaks it up or prevents its formation.
75 the combustion chamber 26.
manner. It-will be seen that the l'.-shapes of .
65 legs 6! and 92 are such as to impart a substan
I
6
2,126,104
Although, for all ordinary purposes, success
in] operation may be obtained with plates I02
which are smooth on both sides, it is within the
contemplation of this invention that, where con
5 ditions require it, plates I02 may be provided with
small projections or otherwise suitably roughened
on the sides which contact with the fuel in order
to increase the frictional engagementtherewith.
- Also, in some instances where conditions warrant
10 it, one of the two plates shown may be omitted,
although best results are obtained by using both,
as in the preferred embodiment.
In connection with the fuel agitating means
just described, it has been discovered that the
15 same device is equally e?icient for the prevention
of arching and clogging of a number of other ma
terials which are normally fed from hoppers by
gravity in a manner somewhat similar tothat
in which the fuel is fed from hopper 25 in the
20 automatic stoker vherein disclosed. It is there
such as during very cold weather, when long
‘continued- operation of the stoker would raise
the temperature or pressure of the heating me
dium to a dangerous degree before the tempera
ture within the house or enclosure being heated
reached the required degree for which the ther
mostat I24 is set.
In the early fall and late spring, however, there
are often periods of time lasting from twenty
four to forty-eight hours when the outdoor tem
perature is "above that required to be maintained
within the enclosure being heated, with the re-'
sult that thermostat I24 keeps the stoker shut
down during this entire period of time and the
fire in the combustion chamber becomes extin 15
guished because of lack of additional fuel and
air over this long period of time. This spell
of warm weather then terminates in a cool wave
with the result that thermostat I24 starts-the
stoker but, since there is nothing to cause igni 20
fore within the contemplation oi‘ this invention ' tion of the fuel in the combustion chamber, fuel '
that the invention embodied in agitator plates
I02 and their associated mechanism may like
wise be utilized in connection with gravity feeders
25 in general, as for feeding grain, chemicals and
the like.
Where automatic stokers of the type herein
disclosed are installed in heating systems for
residences, apartment houses and the like, it has
30 hitherto been the custom to install a tempera
ture or pressure responsive device on the furnace
or boiler to operate in conjunction with a ther
mostat located within the house for controlling
the temperature to which the house is heated.
35 Such an installation is diagrammatically illus
trated in Fig. 1 wherein a temperature or pres
is consequently fed into the burner, is unburned
and no heat is generated. In order to cure this
defect, novel means are provided by the present
invention for controlling the operation of the 25
stoker independently of regulator I20 and ther
mostat I24, and thereby preventing extinguish
ment of the ?re in combustion chamber 26
during short periods of warm weather.
As shown, a third regulator I26 of any de 30
sired construction is installed in return line 34
of the heating system, with a temperature sensi
tive bulb I21 directly exposed to the heating
medium in return line 34.
An electric circuit
I28 leads from regulator I26 to relay switch I22 35
and is so connected as to operate said switch
sure responsive control device I20 is mounted independently of circuits I2I and I25. Regu
on top of boiler 23 and subject to the tempera
I26 is calibrated to operate at a tempera
ture-pressure condition of the heating medium lator
ture
materially
below that at which regulator
40 within water jacket 32, ‘said vdevice being ad-' I20 is set, and its electrical connections to relay 40
justable for di?'erent temperatures or pressures
within the range of operation of the heating switch I22 are such that it will start motor ‘I2
and stoker 24 when the temperature of the heat
system so that when the water or steam at
ing
medium reaches this low point even though
tains the maximum temperature or pressure, the
current through an electric circuit I2I in which
control device I20 is connected will be broken
thereby operating a relay switch I22 which con
trols the supply of current in circuit I25 leading
to the electric motor 12 of the automatic stoke'r,
50 thereby stopping motor ‘I2 and interrupting the
operation of the stoker. As soon as the tem
perature or pressure of the heating medium
drops slightly, the regulator or control device
I20 again closes circuit I2I, actuates relay switch
55 I22 and againv starts motor 12 and stoker 24.
Operating in conjunction with regulator I20 is a
thermostat I24 located in the enclosure being
heated and set for the desired temperature to be‘
maintained therein. When this temperature is
60 reached, thermostat I24 operates to break an
electric circuit I25 in which it is connected and,
since circuit I25 also controls relay switch I22,
stops motor 12 and the stoker. When the tem
perature at thermostat I24 drops slightly, circuit
I26 is again closed and the stoker again started.
With this installation, the main supply circuit
I25 to motor ‘I2 of the stoker is controlled by
both regulator I20 and thermostat I24 in such a
manner that when either or both of said devices
10 have operated to open their respective circuits,
motor ‘I2 is stopped and the stoker is not oper
itnlxso as .to feed i’uel and air to the combus
tion-\chamber. _By this means, the heating me~
dium\within boiler 23 is prevented from reach
75 ing an excessive temperature or pressure at times,
regulator I20 and thermostat I24 have oper
ated to break‘ their respective circuits I2I and'
I25.
By way of example, it may be stated that, on
a steam boiler, regulator I26 may be set to operate
at a temperature slightly below that of steam,
as at 180° F, With regulator I26 set at this
low temperature, a period of warm weather
would cause thermostat I24 to stop the stoker,
but when the water in boiler 23 has cooled down
to 180° F., regulator I26 would operate to com
plete the circuit to motor ‘I2 and to start the 55
stoker, and would cause it to operate for a
short period of time until the temperature of
the water in the boiler rises slightly above 180°
F., whereupon regulator I26 would operate to
stop the stoker until the temperature ,of the heat 60
ing medium again fell below 180° F. This causes
an intermittent operation of the stoker for short
periods of time and prevents total extinguish
ment of the fire in the combustion chamber, yet
no heat is supplied to the enclosure being heated
since the water in the boiler is maintained below
the boiling point and no steam is generated. In
a hotawater heating system, regulator I26 may
be set to operate at a temperature only slightly
above any anticipated outdoor temperature, for 70
example 85° F. This low setting is likewise main
tained in hot air systems. By this means the fire
in the combustion chamber of the stoker is kept
alive for a substantial period of time even though
~ the outdoor temperature is su?lciently/high/to'u/
7
2,128,104
all conditions, and a high efficiency of combus
not requi're'any heating of the enclosure, and is
.always in readiness, for regular'operation when
tion is obtained.
-
Suitable means are also-provided by the present
invention for reducing or eliminating the noise
I , ever the weather turns cool.
Although various means'have hitherto been 3
provided for regulating the‘ rate ‘at which_ which is normally produced by the high speed
moving parts and the passage of the air through
fuel is fed into the burner of an automatic stoker,
and although it is 'also common practice to pro
vide some manual control means for regulating
the blower of automatic stoker installations of the
type herein disclosed. As shown in Figs. 1, 2, l6
and 17, the‘ noise due to the moving parts of
electric motor ‘I2, blower 28 and the speed reduc 10
ing mechanism housed in casing ‘I3 is deadened
the amount of air admitted to the burner, in
10 those stokers hitherto known the control of the
fuel feed is separate and distinct from the con
trol of the air supply, ‘and it has been left to
the operator to adjust these as best he can. This
often results in an improper balance between the
15 air admitted and the fuel fed to the combustion
chamberwith a consequent inefficiency in the
by mounting these devices upon an individual '
base l38 which is entirely separate and distinct
from the main stoker base 58, and by support
ing said base I38 upon a plurality )of coil springs 15
I39 or other suitable resilient supports, said
springs resting upon a suitable asbestos base MI]
on the furnace room ?oor. In order to permit
free vibration of base I38 without interfering
. operation of the stoker. Novel means are there
fore provided in the present invention for over
coming thisobjection by combining with the fuel
with-the stoker drive, shaft ‘It which transmits 20
'20 feed and air supply adjusting means, an auto
the driving energy from the speed .reduction
matic connection whereby when the relative
amounts of air and fuel fed have been once ad
:lusted, any change in the adjustment of one will
automatically change the other by the proper
mechanism in casing ‘I3 to the fuel feeding mech- '
anism ll may be provided with a pair of suitable
?exible couplings Ml of any'desired construction.
The noise of. the moving parts of blower 2b is 25
amount.
'
'
As shown in Figs. 1 and 16, fan or blower ll‘ ‘ further deadened by constructing blower casing
lid with double walls and an air space therebe
is provided with a casing lid which is reduced
in diameter at oneend and provided with an tween. As shown best in Figs. 16 and 17, casing
ill comprises an outer wall llll which is pref
erably made of hard ?ber or other non-resonant 30
material, an inner wall ill secured in any desired
manner to outer wall Ill and preferably made of
metal, and a dead air space ill between said
axial opening therein to serve as the air inlet
or supply ill to said blower. Fitting over. and
around the reduced end of casing ill forming
air inlet ill is a cup-shaped cap member ill
having a rearwardly extending stem Ill which
is slidably'mounted in a boss I33 formed in
walls.
casing lid.
in order to deaden the noise caused by the
flow _of air through blower ll, the overlapping ar
rangement of cap member lit and the reduced
portion of easing lid is provided in order to make
the inlet passageway to the blower a tortuous path
as indicated by the arrows in Fig. 16. By this
arrangement, the whistle which is ordinarily pro
duced by the inrushing air to a blower is practi
connected one end of a- suitable connecting rod
40 ill the opposite end'of which is pivotally se
cured to the lower end of regulating lever ‘it of
the speed reduction mechanism housed within
easing ll.
,
Cap member lll' may also be provided
with a double wall similar to that described for 35
tegrally with a pair of supporting arms ill
which are suitably secured to the larger portion
of easing ltd of blower El.‘ Cap member ill is
also provided with a lug lit to which is pivotally
\
As previously mentioned, movement of lever ‘ll
to the right, as viewed in'Flg. 1, decreases the a cally eliminated.
A further improvement which
45
decreases the noise produced by the blower lies 7
speed of operation of the fuel feeding mechanism
ll, and, due to the operative connection between
.inthe provision of a short bellows-shaped sec
the lower end ‘of said lever and‘ cup member it i , it v tion ill of flexible, non-resonant material, such
is evident that such movement will also move said as rubber, leather or other similar fabric, inter
cup member to the left, as viewed in Fig. l‘, and posed in conduit ll which conducts the air sup
decrease the effective size of the air inlet llll plied‘by blower it to wind box or air trunk 29.
With this arrangement, the hum of motor ‘It
‘to blower ld,.'and ‘hence decrease the amount of
air supplied thereby to combustion chamber 2t. and the movement of the gears in housing ‘id is
so
silenced by the flexibility. of springs ill, while
Suitable manual adjusting means, such as a turn
the roar of fan or blower it is deadened by the 55
sound deadening walls of easing ill, and by the
ber ill at any given position of speed regulating > tortuous inlet passageway ‘which the air must
lever ‘ll. Once this adjustment is properly made I travel in reaching the blower. Flexible bellows
section ill also permits a free vibration of the
for any particular stoker installation, any fur
60
buckle ll'l, is also provided. in connecting rod it
for manually adjusting the position of cap mem
high speed moving parts wlthoutconducting any
ther change in adjustment of the speed of opera
sound to the stationary parts of the stoker.
Although it will be evident from the preceding
tion of the fuel feeding mechanism will auto
matically operate to vary the amount of air sup
plied to blower ‘28. For example, moving lever
‘Ill to the right, as viewed in Fig. 1, reduces the
rate at which fuel is fed into combustion cham
ber 25, and also draws cup member l3l closer
over air inlet l3ll of blower 28 and correspondingly
reduces the amount of air which can be taken in
‘thereby- Similarly, a movement of lever ‘I8 to
70 the left increases the rate of fuel feed and auto
matically pushes cup member I3l to .the right
thereby ‘increasing the amount of air ‘supplied to
the blower. By'this means the proper ratio be' tween air supplied and fuel fed to combustion
description how the various elements of the pres
ent invention function, the operation of the em
bodiment shown in Figs. 1-17 may be summarized
as follows: Assuming that fuel hopper 25 is ?lled
with fuel, and that the temperature or pressure
conditions of the enclosure being heated and the
heating medium are such that relay switch I22
is in position to close the main supply circuit I23:
to electric motor ‘I2, said motor will be driving
,
fuel feedingmechanism 21 through the speed ‘re
’
duction mechanism, and will be directly (driving
blower '28 for supplying air to the combustion ‘
75 chamber 26 is automatically maintained under ‘chamber 25. Fuel is fed from hopper 25 by. 7.5-"
8
,
2,126,104
gravity through outlet 43 and into annular space
46 between housing 44 and drum 45. Should
there be any tendency for the fuel to arch or clog
adjacent outlet 43, agitator plates I02 which are
being alternately reciprocated through the driv
ing connections from shaft N8 of the speed re
duction mechanism will act to break up any such
arch or to prevent its formation. The fuel which
is fed into annular space 46 is engaged by pad
10 dles 63 as feeding drum 45 is rotated in a counter
clockwise direction, said paddles or blades being
alternately extended and retracted beyond and
within the periphery of drum 45 by the action of
cam members 66 and ‘II. Should any blade 63
15 encounter unusual resistance to its outward ex
tension due to foreign matter in the fuel, cam
member 66 will oscillate about its pivot to allow
blade 63 to ride over the obstacle until it reaches
a point where it can ?nd its way through the
20 less resisting body of fuel and assume its fully
extended position in contact with the interior
surface of housing 44. The fuel is thus carried
around through annular space 46 by blade 63 and
is discharged upwardly into inlet 41 of combus
25 tion chamber 26, the enlargement of said inlet
over the size of annular space 46 permitting the
incoming fuel to become mixed and agitated at
' this point.
The fuel is then fed upwardly within combus
‘tion chamber 26 due to the continuous feed of
additional fuel below it, and gradually progresses
through burning zone 30 of the combustion
chamber where it unites with the draft of air
which’ is being blown, transverse to the direction
.35 of movement of the fuel body, through inlet
tuyéres 81, 88 from air trunk 29 to which it is
supplied by blowers 28. The hot gaseous prod
ucts of combustion are exhausted through out
let tuyéres 89, 90 into conduit 3| whence they
40 pass into ash pit v3!‘: of boiler 23 and circulate
upwardly therefrom in contact with the heating
surfaces 36 of said boiler, ?nally escaping
through smoke pipe 31 to the ?ue or chimney.
After passing through burning zone 30 and being
45 completely consumed, the fuel reaches the upper
portion or exit 48 of combustion chamber 26 as
ash or clinker and gradually over?ows by gravity
into ash discharge trough 49 whence it passes
through chute '50 into ash’can 52. In the mean
50 time, the tuyeres and other parts of combustion
chamber 26 have been cooled and maintained at
a temperature not materially higher than that
of the heating medium within boiler 23 due to
the circulation of said heating medium through
the hollow walls of the sectional elements making
up said combustion chamber.
The operative connection between regulating
lever ‘I8 of the speed reduction mechanism and
cap member I3I covering the air inlet to blower
60 26 insures that at all times the proper ratio of
fuel fed and air supplied to the combustion
circuit I23 to motor ‘I2 and stop the stoker until
such time as the temperature within the en
closure or in the heating medium falls below that
at which said regulating devices are calibrated.
Should a period of warm weather occur during
the time'when the automatic stoker is in opera
tion, such that it is not required that the fur
nace heat the enclosure, auxiliary regulator I26
will function to intermittently start and stop
the stoker so as to prevent complete extinguish
ment of the fire within the combustion chamber
26.
In the usual types of stoker installations where
the combustion chamber is located within the
?re box of the furnace, it is a common defect 15
that the blast of air from the fan or blower car
ries foreign particles of ash and dust up into the
?ues and smoke pipes of the furnace, covering
them with a coating which reduces the heating
e?iciency of the installation, and in some cases 20
blows this dirt through the chimney and dis
charges it on the house tops and surrounding
lawns. The embodiment of the present invention
illustrated in Figs. 1-17 obviates this defect to
some extent by virtue of the fact that the com
and the shape of the conduit through which the
hot gases pass on their way to the boiler is such
as to cause most of the fine ash and dust to be
30
deposited in the ash pit of the boiler.
Referring now to Fig. 18, there is disclosed
therein still another means for reducing or elimi- .
nating this defect. The stoker installation dis
closed in Fig. 18 is substantially the same as that
previously described, although several features 35
have been omitted from the illustration in the
interest of simplicity, with the exception that
legs 9| and 92 of the rear pieces of the inter
mediate sections making up combustion chamber
26 are not only provided with spacing ribs 66 40
around the outside edges thereof, but also have
additional ribs I46 of the same height as ribs 66
around the inner edges thereof so as to form
a restricted passageway or conduit I41 for the
gaseous products of combustion. The bottom 45
horizontal portion of each leg 9| is also provided
with a pair of upwardly extending horizontally
spaced partitions I46 and I49, the space between
partitions I48 and the vertical parts of legs 9|
forming a main ash or dust trap I56, while the 50
space between partitions “land I46 forms a
secondary trap I5I. Because of the fact that
passageway I" is restricted in cross sectional
area by ribs I46, the hot gases of combustion ex
hausting through tuyeres 69, 90 attain a relatively 55
high velocity in passing downwardly through this
passageway, and since the fine particles of ash
and dust entrained in said gases are heavier than
the gases, they have a tendency to continue a
vertically downward course and to be deposited 60
chamber is automatically maintained. Likewise,
the resilient, independent mounting of motor ‘I2,
in main trap I50. Any residual particles which
may be carried beyond trap I56 will be deposited
in secondary trap I5I. As the hot gases turn
blower 26 and the speed reduction mechanism
the curve in passageway I41 formed by the L por
65 greatly decreases .the noise caused by the high
speed moving parts of said devices, as does the
double walled casing of the blower, the tortuous
shaped inlet passageway thereto and the ?exible
bellows-shaped section I45 interposed in con
duit 69.
-
Should the enclosure being heated reach the
desired degree of temperature, or should the tem
perature or pressure of the heating medium rise
to a predetermined maximum point, thermostat
75 I24 or regulator I 20 will act to open the supply
25
bustion chamber is located outside of the boiler
tion of leg 92 at high velocity, centrifugal force 65
aids in separating therheavier ash and dust par
ticles from the hot gases and in depositing them
in traps I60. and lil. The ash and dust collected
in traps I66 and Iii may be periodically removed
through a suitable door in the side of combustion 70
chamber 26 similar to that indicated at‘ IIII in
Fig. 1. The almost negligible quantity of dust
which escapes traps I50 and lil is deposited in
ash pit 36 of boiler 23 whence it may be removed
76
through the ash pit door as desired.
9
2,120,104
Although in the preferred form of the inven
' creating a centrifugal force which further tends _
to separate the fine particles of ash and dust
from the hot gases and to deposit said particles
in the bottom of ash pit 35.
The walls of combustion chamber I52 are made
tion, the fuel is fed into a substantially verti
cal combustion chamber, it will be understood
that, if desired, the combustion chambenmay be
inclined at any desired angle from the vertical
hollow in'a manner similar to that previously
without departing from the invention, as in the
case of very small residential installations where
it is preferable that the combustion chamber lie
described in order that they may be cooled by
the circulation therein of the heating medium
from the boiler supplied thereto through a suit
horizontally. Figs. ‘19-22 disclose such an in-,
able pipe or conduit 91 and returned therefrom 10
to the boiler through a similar pipe 98.
i0 stallation wherein the combustion chamber is
substantially horizontal and the air supplied
thereto provides a substantially vertical, down
ward. cross draft. The elemental structure and
Secured to the outlet end 66 of, combustion
chamber I52 is a substantially J-shaped ash pit
casing or housing I12, preferably made of sheet '
metal, provided at its bottom‘portion with a suit 15
able drawer I13 into which the ashes over?ow
principles of operation of this latter embodiment
‘15
of the invention are fundamentally the same as
in the embodiment of Figs. 1-17, although various
minor improvements such as the hopper agitat
ing means, noise deadening means and the auto
matic fuel feed and air supply regulating means
by gravity from the outlet end of combustion
chamber I52. As shown in Fig. 19, drawer I13
is provided with an outer lid I16 which closes
tight around the opening in ash pit housing I12 20
to prevent escape of air therethrough. Ash
2o have been omitted [from the drawings in the in
terest of simplicity, and may be omitted in the
actual installation. if desired.
As shown, fuel-is fed from a hopper 25 by fuel
drawer lid H6 is also provided with a suitable
handle I15 for withdrawing it from housing I12 ' ‘
for the purposes of emptying the ashes. Ash pit
housing I12 is also provided with a weighted
check damper i16_ pivoted thereto at its ‘upper
end as at I11, said damper ‘tending to retard
feeding means 21 as previously described, to a
25 substantially horizontal combustion chamber I52.
The driving means for fuel feeding mechanism
21 is slightly di?'erent from that previously dis
the ?ow of ashes so that the fuel bed will be
maintained compact and the formation of cavi
ties in the hot burning zone 36 will be prevented. 30
Suitable means have also been provided for
preventing the escape of smoke and other gase
ous products of“ combustion back through the
closed in that the speed reducing mechanism
a
housed within casing ‘13, which is driven by mo
tor 12, is provided with a forwardly extending
shaft I53 on which is secured a drive pulley I66
which is connected by a suitable belt I55 with
a similar pulley I56 secured to the driving shaft
fuel supply and out of hopper 25 and through
the ashpit and out of housing I12._ As shown, 35
“1 of a‘ worm I56, the latter engaging and drivi
35 ing a worm wheel I59 which is secured to one of '
a pipe or conduit I16 is connected between wind
box 26 and the inlet 61 to the combustion cham
stub shafts 55 of the fuel feeding mechanism.
Worm I53 and shaft I51 are suitably journalled
in bearing brackets I66 secured to one of a
pair -.of legs I6I which support hopper 25 and
fuel feeding mechanism 21.
v
,
'
_
Combustion chamber I52 is of substantially the
same built-up construction as chamber 26 pre
viously described, having a pair of opposite, grad
ually divergent walls I62 and I63 which form a
45 combustion chamber of gradually increasing cross
sectional area from its entrance to its ~exit, the
upper wall I62 being provided with a plurality
of inlet tuyeres I66 and the lower wall I63 hav
ing a larger number of similar outlet “tuyeres I65.
,50 the construction of said tuyeres being similar to
those of the preceding embodiments:- -Air is sup
plied under pressure to inlet tuyeres' I66 from‘ a
blower 23 through conduit 66 and an air trunk'
or wind box 26, is forced downwardly through
ber, and an additional pipe I19 between wind box
29 and av point within ash pit housing I12 adja
cent the exit 68 of combustion chamber I52. By 40
thus leading air fromf wind box 29 to points ad
jacent the entrance and exit of the combustion
chamber, the air pressure at these points is
equalized with that in burning zone, 36 and any
tendency for smoke or other gaseous products of 45
combustion to escape in these directions is eifec
tively prevented.‘
.
-
v
_
'
, It will be understood that in any installation
where the combustion chamber is inclined at
an angle to the vertical, as in the embodiment 50~
just described, ?xed cam H of the fuel feeding
mechanism is suitably located so that blades 63
are retracted within fuel feeding drum 65 at
the proper time, just as they-approach the dis
55
charge end of annular space 66..
Although the automatic stokers embodying the
substantially vertical direction, and the products
of combustion are exhausted through tuyeres' present invention have been illustrated as con
I66 into a chamber or conduit I66 formed below nected to a steam or hot water boiler, it will be
tuyeres I66 by an offset portion I61 of bottom understood that the invention is equally appli
"wall I63 of the combustion chamber. From cable to any other type of heating plant. For
55 the moving ‘body of fuel in burning zone 36 in a
chamber I66, the gaseous products of combus- _ instance, in the case of a hot air furnace, the
tion are conducted at right angles through a connections are substantially the same as those
illustrated with the exception that pipes 61 and
conduit I66 into the ash pit 351 of the boiler.
_
' As will be seen from'Flg. 22, the bottom of 66 leading from water jacket 32 of the boiler
chamber I66 is lower than‘that of conduit I66
‘ thereby providing an ash or dust trap I66 in
‘ which fine particles of ashor dustare deposited
from ‘the hot gases on their way to the boiler,
' said ash and dust being removed when desired
70 through a suitable door I16 in the side of cham-v
ber I66. .Conduit I66. is also provided at its dis
charge end in ash pit v35 with a downwardly
curved baflle plate ' "I which de?ects the hot
gases downward as they enter the ash pit, the
to the hollow walls of the combustion chamber
would be replaced by air pipes, and a rapid cir:
culation of air would be maintained through the
air chamber of the furnace and the hollow walls
of the stoker combustion chamber by means‘ of
a power driven fan of the type now generally
70 '
used with hotair'furnaces for circulating the ' /
heated air to the registers of the enclosure being
heated.
There is thus provided by the present
I
inven
_
curvilinear velocity thus imparted to said gases - tion a new and improved form of heating/plant
1
10
2,126,104
ited to the forms described and illustrated in the
tion chamber located exteriorly of the boiler and accompanying drawings, but is capable of a vari
operating on the cross draft principle, thereby ety of mechanical embodiments. For example,
any desired form of fuel hopper may be substi
providing an installation which is not only effi
tuted for the specific form shown and described,
cient and dependable in operation, but also suc
cessfully solves the various problems incident to and any suitable forms of speed reduction mech
installations of this character and obviates the anism may obviously be employed for driving the
fuel feeding mechanism. Likewise, it will be un
defects common thereto.‘ Not only has the dis
posal of ashes and clinker been greatly facilitated derstood that any known means of automatic
10 by locating the combustion chamber outside of control of the heating plant may be substituted
for the system described and illustrated. More
the boiler, but novel means have also been pro
vided for automatically discharging said ashes over, features illustrated only in conjunction with
and clinker from the combustion chamber, and one embodiment may be used in other embodi
for entrapping the fine particles of ash and dust ments, and various combinations can be made of
15 which become entrained in the gaseous products vthe several features illustrated and described,
of combustion and would otherwise be carried within the present invention. Various other
embodying an automatic stoker having a combus
into the boiler and deposited on the heating sur
faces and in the flues and smoke pipes thereof.
The present invention also provides novel fuel
‘20 feeding mechanism which permits a yielding of
the moving parts should foreign obstructions be
encountered in the fuel being fed, and thereby
avoids breakage or straining of the mechanism,
and includes novel agitating means for' prevent
25 ing the formation of arches in the fuel of the
hopper at the comparatively restricted outlet
thereof. As has previously been mentioned, this
latter improvement is equally well applicable to
any other form of gravity feeding hopper means
changes, which will now appear to those skilled
in the art, may be made in the form, details of
construction and arrangement of the parts with
out departing from the spirit of the invention, 20
and reference is therefore to be had to the ap
pended claims for a de?nition of the limits of
the invention.
What is claimed is:
1. A combined automatic stoker and furnace 25
unit comprising a fuel hopper, a combustion
ing or clogging tendency.
chamber extending upwardly at an acute angle
thereto, means intermediate said hopper and said
combustion chamber for feeding fuel from said
hopper to said combustion chamber and for mov 30
ing the body of fuel upwardly‘through said com
Due to the novel construction of the combus
tion chamber provided by the present invention, a‘
bustion chamber, means for providing a cross
draft. of air from one side of said combustion
30 where the material is subject to this same arch
_ fuel bed of predetermined thickness is constant
35 ly maintained, and at the same time it is impos
sible for the fuel to burn through in an irregular
manner and form arches because the fuel is posi-_
tively fed into the combustion chamber, that is,
the fuel is forced into said chamber and con
tinually agitated by the upward or lateral thrust
of the fresh fuel being fed in at the inlet end
of said chamber. The wallsand tuyeres of the
combustion chamber are continuously cooled by
the circulation within the hollow walls thereof of
the heating medium of the boiler itself, thereby
chamber to the other substantially transverse to
the direction of movement of the fuel body there
through for supporting combustion therein, and
means for conducting the gaseous products of
combustion therefrom.
‘
2. In an automatic stoker, a fuel hopper, an‘
elongated,
stationary
combustion
chamber, 40
means between said hopper and said combustion
chamber for feeding fuel from said hopper to
said combustion chamber and for moving the
body of fuel thus supplied longitudinally through
said chamber, tuyeres disposed in opposite walls 45
not only preventing damage to these parts ‘of the - of said combustion chamber. means for supply
stoker which are exposed to high temperatures, ing air to the moving body of fuel through the
but also increasing the heating ef?ciency of the . tuyeres in one wall of said chamber, and means
heating plant as a whole. Novel means have also for exhausting from said chamber the gaseous
been provided whereby a predetermined relation
ship is automatically maintained between the
amounts of air supplied and fuel fed to the com
bustion chamber, said means including a manual
adjustment for the air supply independent of the
fuel feed.
A further improvement provided by the present
products of combustion through the tuyeres in 50
the opposite wall, whereby the draft in said
chamber is substantially transverse to the direc
tion of movement of said body of ‘fuel.
3. In a heating plant, a fuel supply, a com
bustion chamber having gradually divergent 55
walls from the entrance to the exit thereof, the
invention consists in the provision of novel aux
iliary thermostatic control means for periodical
walls of said chamber providing a burning zone
of de?nite cross sectional area and volume,
ly starting and stopping the stoker independently
means for positively feeding fuel from said sup
ply to said combustion chamber and for main
taining said chamber full of fuel whereby a fuel
bed of predetermined thickness is provided, and
00 of the normal controls, and without heating the
enclosure, in order that the extinguishment of
the ?re in the combustion ‘chamber may be pre
vented during short periods of warm weather
which may occur during the time when the stoker
65 is in operation. Also, novel means are included
for deadening the noise produced by the blower
and other high speed parts of the stoker appara
tus and for preventing transmission of these
noises to other parts of the heatingplant. The
p70 stoker installation thus provided is adapted for
use with any of the usual types of heating plant,
large or small, and is readily and inexpensively
tuyére means disposed in the opposite divergent
walls of said chamber for providing a draft
which throughout the combustion zone is across
the direction of movement of fuel through said
chamber.
4. In a heating plant, a fuel supply, a com
bustion chamber having gradually divergent
walls from the entrance to the exit thereof, 70
means for positively feeding fuel from said sup
ply to said combustion chamber and for main
taining said chamber full of fuel whereby a fuel
’ installed with a minimum of reconstruction and
rearrangement work.
' bed
76
It‘willbe obvious that the invention is not lim
of predetermined thickness is provided,
tuyéres disposed in the opposite divergent walls 75
"11
2,126,104
of said chamber, means for supplying air to the
fuel bed through the tuyeres in one of said di
gated, stationary combustion chamber having
approximately horizontal )walls, means for feed
vergent walls, and means for exhausting from
ing fuel from said hopper to said chamber and
for moving the body of fuel thus supplied hori
'zontally and axially through said chamber, and
tuyere means disposed in a pair of opposite
said chamber the gaseous products of combus
.- tion through the tuyeres in the, opposite diver
gent wall, the cross sectional area of said ex
haust tuyeres exceeding that of said supply
tuyeres.
walls of said chamber for creating a cross draft
"through said moving fuel body.
~
11. In a heating plant, a fuel hopper, anelon
5. In a heating plant, a fuel supply, a com
gated, stationary combustion chamber having ap 10
proximately horizontal walls, said walls being
gradually divergent from the entrance to the exit
of said chamber, means for feeding fuel from
said hopper to said chamber and for moving the
body of fuel thus supplied horizontally and axially 15
through said chamber, and tuyere means disposed
in a pair of opposite divergent walls of said cham
bustion chamber having gradually, divergent
walls from the entrance to the exit thereof,
means for positively feeding fuel from said sup
ply to said combustion chamber and for main
taining said chamber full of fuel whereby a fuel
15 bed 'of predetermined thickness is provided,
tuyeres disposed in the opposite divergent walls
of said chamber, means for supplying air to the
fuel bed through the tuyeres in one of said di
vergent walls, means for exhausting from said
20 chamber the gaseous products of combustion
ber for creating a cross draft through said mov
ing fuel body.
through the tuyeres’in the opposite divergent
tuyeres exceeding that of said supply tuyeres,
and ash‘ removal means disposed adjacent the
exit end of said chamber into which the ashes
of said chamber, means for feeding ‘ fuel from
said hopper to said chamber and for moving the
body of fuel thus supplied horizontally and axially
through said chamber, tuye're means disposed in
a pair of opposite divergent walls of said chamber
over?ow by gravity.
' 6. In a heating plant, a fuel hopper, a com
bustion chamber having approximately vertical
walls, means for feeding fuel from said hopper
to said‘ chamber and for moving the body of fuel
for creating a cross draft throughrsaid moving '
30
fuel body, and ash removal means disposed ad
thus supplied vertically upward through said
jacent the exit end of said chamber into which ‘
chamber, tuyere means disposed in opposite walls
‘of said chamber, means for supplying air to the
the ashes over?ow by gravity.
fuel body through the tuyeres in one of said "
walls, and means for exhausting from said cham
ber the gaseous products of combustion through
the tuyeres in the opposite wall.
7. In a heating plant, a fuel hopper, a com
bustion chamber having approximately vertical
walls,'said walls being gradually divergent from
13. In a heating plant, a fuelsupply, a com»
bustion' chamber, means for positively feeding fuel 35
from said supply to and through said combustion
chamber, inlet andoutlet tuyeres disposed in op
posite walls of said chamber for creating a‘cross
draft through the fuel, a furnace, and conduit
means connecting saidv outlet tuyeres with- the 40
interior of said furnace.
the bottom to the top of said chamber, means
-
1
14. In a heating plant,‘ the combination with a
boiler of a combined stoker and combustion
for feeding fuel from said hopper to said cham
ber and for moving the body' of fuel thus sup
chamber'detachably mounted in communication
plied vertically upward through said chamber,
45 tuyere means disposed in the opposite diver
20
gated, stationary combustion chamber having ap
proximately horizontal walls, said walls being
gradually divergent from the entrance to the exit
wall, the cross sectional area of said exhaust
,
'
12. In a heating plant, a fuel hopper, an'elon
' therewith, said combined stoker and chamber in
.gent walls of said chamber, and means for creat
ing a cross draft through said moving fuel body
from one of said tuyere means to the other.
‘
8. In a heating plant, a fuel hopper, a com
bustion chamber having approximately vertical
walls, means for feeding fuel from said hopper
to said chamber and for moving the body ‘of
fuel thus supplied vertically upward through
said chamber, tuyere ineans disposed in opposite
55 walls of said chamberifor providing a cross draft’
transversely from one side of said moving fuel
body to the other, and ash removal means dis
cluding means for positively feeding fuel to and
45
maintaining a fuel bed of predetermined thick-v ness in said chamber, means for creating a cross
draft by'applyingair to one side of saidvfuel bed,
and means for conducting the gaseous products 50
of combustion from ‘the opposite side of said
chamber to the interior of said boiler. =
15. In a heating plant, the combination with
a boiler of a combined stoker and combustion
chamber detachably mounted in communication
therewith, said combined stoker and chamber in- _
eluding a fuel hopper, a combustion chamber
posed adiacent the upper end of said chamber laterally disposed with respect to said hopper and
having gradually divergent ,walls from the en- .
into which the ashes over?ow by gravity.
60
9. In a heating plant, a fuel hopper, a com
' ~bust'ion chamber havingapproximately vertical
walls, means for feeding fuel from said hopper,
to said chamber'and for moving the body of
fuel thus supplied vertically upward through
said -chamber',tuyere means disposed in oppo
site walls of said chamber for creating a crossL.
draft through said moving fuel body; and means .
for removing the ashes from said chamber com?
prising a downwardly inclined trough‘adjacent
70 to and in communication with the upper end of
said chamber into which the ashes over?ow, and
a chute connecting with the lower end of said
trough and discharging into a removable ash
receptacle.
75
.
10. In a heating plant, a fuel hopper, an elon
trance to the exit thereof, means for positively 60.
feeding fuel from said hopper‘ to said chamber
and'for moving therethrough the body of fuel‘
thus supplied, tuyeres in one of said divergent
walls for supplying air to the fuel bed, tuyeres in
the opposite divergent wall for exhausting the 65
products of combustion from said chamber, and
conduit means, connecting said exhaust tuyeres
with the interior of said boiler. .
> 16. In combination, a boiler, a combustion
chamber exterior of said boiler, conduit means for"
conducting the gaseous .products of combustion
from said chamber to the interior of said boiler,
said conduit means including means for directing
said gaseousv products at a relatively high‘velocity
in a curvilinear path, and a dust trap wherein 75
12
2,126,104
?ne particles of dust and ash entrained in said
gaseous products are deposited by centrifugal
force.
17. In combination, a ‘boiler, a combustion
chamber exterior of said boiler, conduit means for
conducting the gaseous products of combustion
from said chamber to the ash pit of said boiler,
a dust trap associated with said conduit means
for collecting dust andv ?ne ash blown through
10 the combustion chamber, and bafiie means at the
delivery end of said conduit means for imparting
to said gaseous products of combustion a rela
tively high curvilinear velocity toward the bottom
of said ash pit and thereby depositing therein
15 additional quantities of dust and fine ash en
trained in said gaseous products.
18. In an automatic stoker for solid fuels, a
fuel hopper, a combustion chamber, and means
for feeding fuel from said hopper to said chamber
20 comprising a rotatable drum interposed between
the exit of the fuel hopper and the entrance of
the combustion chamber, a plurality of blades
carried by said drum, means for yieldingly ex
tending said blades beyond the periphery of said
25 drum at the exit of said hopper to engage the
fuel and carry it to the entrance of said chamber,
and means for positively withdrawing said blades
within the periphery of said drum at the entrance
of said chamber.
30
_
. 19. In an automatic stoker for solid fuels, a fuel
hopper, a combustion chamber, and means for
feeding fuel from said hopper to said combustion
chamber comprising a rotatable drum interposed
between the exit of the fuel hopper and the
35 entrance of the combustion chamber, a plurality
to said chamber, a constant speed motor, means
for driving said fuel feeding means from said mo
tor and a blower directly connected to said motor
for supplying air to said combustion chamber, the
combination of a housing for said blower having
an opening therein to admit air to said blower, a
cap member mounted adjacent said opening and
movable with respect to said housing, the space
between said cap and housing providing an air
inlet passage to said blower, means for moving 10
said cap relative to said housing to vary the
amount of air supplied to said blower, means for
varying the speed at which said fuel feeding
means is driven by said motor, and means opera
tively connecting said last two mentioned means 15
for movement together whereby the amount of
air supplied by said blower to said combustion
chamber is regulated in proportion to the
amount of fuel fed thereto by said fuel feeding
means.
trance of said chamber, means for removing
ashes from the exit of said chamber, inlet and
outlet tuyeres in opposite sides of said chamber, 25
.means for supplying air under pressure to the
inlet tuyeres, an exhaust passage communicating
with said outlet tuyeres, and conduit means lead
ing from said air supply means to points adja
cent the entrance and exit of said combustion 30
chamber whereby the air pressure is equalized
on both sides thereof.
23. In an automatic stoker, a combustion
chamber, a fuel supply passage at one end of said
chamber, an ash discharge passage at the other
of ‘blades pivotally mounted within said drum,
end of said chamber, tuyéres in opposite sides
a plurality of slots in the periphery of said drum
through which said blades are adapted to recipro
cate, a roller operatively associated with each
40 blade, a cam adapted to be engaged by said rollers
in succession and to force said blades outwardly
through said slots and into engagement with the
fuel when adjacent the exit of said hopper, said
cam being oscillatable around a fixed pivot and
balanced by a counterweight to permit a yielding
45
extension of said blades, and a fixed cam adapted
to be engaged by said rollers and to positively
force said blades inwardly through said slots when
adjacent the entrance of said chamber.
of said chamber intermediate said fuel supply and
ash discharge passages, an air trunk connected
with the tuyeres in one of said sides of said cham
50
20. In an automatic stoker for solid‘ fuels, 9.
fuel hopper, a combustion chamber, and means
for feeding fuel from said hopper to said chamber
comprising a rotatable drum interposed between
the exit of the fuel hopper‘ and the entrance of
the combustion chamber, a plurality of shafts‘
journalled within said drum adjacent the periph
' ery thereof, a lever rigidly secured to each of
said shafts, a fuel feeding blade pivotally con
nected to each of said- levers, an arm rigidly
80 secured to each of said shafts, a roller mounted
on each of said arms, a plurality of slots in the
periphery of said drum through which said blades
are adapted to reciprocate, a cam adapted to be
engagedby said rollers and to force said blades
outwardly through said slots and into engagement
with the fuel when adjacent the exit of said
hopper, said cam being osclllatable around a ?xed
pivot and balanced by a counterweight to permit
a yielding extension of said blades, and a fixed
70 cam adapted to be engaged by said rollers and
to positively force said blades inwardly through
65
a said slots when adjacent the entrance of said
chamber.
21>1In an automatic stoker of the type embody-'
75 ing a combustion chamber, means for feeding fuel
20
22. In an automatic stoker, a combustion
chamber, means for feeding fuel into the en
ber for producing a cross draft therein, an ex
40
haust passage communicating with the tuyeres
in the opposite side of said chamber, and conduits
leading from said air trunk into both said fuel
supply and ash discharge passages whereby the
escape of gaseous products of combustion through
said passages is prevented.
24. A combined automatic stoker and furnace
unit comprising a fuel hopper, a combustion
chamber in communication therewith, means in
termediate said hopper and said combustion 50
chamber for positively feeding the fuel into and
through said combustion chamber, inletand out
let tuyeres in opposite sides‘ of said combustion
chamber, a conduit for supplying air to said inlet
tuyeres and thence to said fuel bed in a direction
transverse to the direction of movement of the
fuel therein whereby a fuel bed of predetermined
thickness is maintained, a conduit for leading the
products of combustion from said outlet tuyeres,
a blower for forcing air through said tuyeres and 60
fuel bed, and a motor for driving said feeding
means and said blower, all of said elements con
stituting a self-contained unit adapted to be
mounted exteriorly of a boiler'and to be detach
ably connected thereto.
65
25. A combined automatic stoker and furnace
unit comprising a fuel hopper, a combustion
chamber in communication therewith, means in
termediate said hopper and said combustion ,
chamber for postively feeding the fuel into and 70
through said combustion chamber, inlet and out
let tuyeres in opposite sides of said combustion
chamber, a conduit for supplying air to said inlet -
tuyeres and thence to said fuel bed in a direction
transverse to the direction of movement of the 75
in
2,126,104
fuel therein wherebyza fuel bed of predetermined
thickness is maintained, a conduit for leading the
products of combustion from said outlet tuyeres,
a blower for forcing air through said tuyeres and
"-13
maintain said chamber full of fuel and thereby,
provide a burning zone of predetermined thick
ness, means for providing a cross-draft of air to
one side of said combustion chamber substantially I
transverse to the direction of movement of the
fuel bed, and means associated with said com vfuel
body therethrough and to support combus
bustion chamber for removing ashes from the end
of said chamber, all of said elements constituting tion therein, and means for conducting the gase
a self-contained unit adapted to be mounted ex
teriorly of a boiler and be detachabiy connected
10
thereto.
~
26. Acombined automatic stoker and furnace
unit comprising a fuel hopper, a combustion
chamber in communication therewith, means in‘
termediate said hopper and said combustion
15 chamber for positively feeding the fuel into and
through said combustion chamber, inlet and out
let tuyeres in opposite sides of said combustion
chamber, a conduit for supplying air‘ to said inlet
tuyeres and thence to said fuel'bed in a direction‘
20 transverse to the direction of movement of the
fuel therein whereby a fuel bed of predeterminedv
thickness is maintained, a conduit for leading the
ous products of combustion, from the opposite, side
of said combustion chamber..
' .28. In an automatic, stoker, afuel hopper, a 10
combustion chamber laterally disposed with re
spect to said hopper, the walls of said chamber I '
providing a burning zone of de?nite cross sec
tional area and volume, means for feeding fuel
from said hopper to said combustion chamber and -
for positively moving said fuel therethrough, the
body of fuel thus supplied completely ?lling said ,
combustion chamber and thereby constantly pro
viding a fuel bed of predetermined thickness, and
tuyeres in the opposite walls of said combustion
chamber for supplying air thereto and withdraw
ing the gaseous productsof combustion therefrom
products of combustion‘ from vsaid outlet tuyeres, in a. direction} substantially transverse to the di
a blower for forcing air through said tuyeres and rection of‘ movement of said body of fuel there
25 fuel bed, means for agitating the fuel in said
hopper to prevent arching therein, and a motor '
> 29. In' an "automatic stoker, a fuel'supply, a
for driving said fuel feeding means, said blower ' combustion ‘chamber the walls of which provide a
and said agitating means, all of said elements con
burning zone of de?nite cross sectional area and
stituting a self-contained unit adapted to be volume, means for ‘ positivelyifeedingjfuel from
mounted exteriorly of 'a boiler and be detachably said supply into said combustion; chamber to
connected thereto.
‘
" maintain said chamber completely-?lled ‘with fuel
27. A combined automatic stoker and ,furnacei A and for moving said fuel through‘ said chamber,
comprising a fuel hopper, an elongated, station-; whereby a burning fuel bed of predetermined
ary combustion chamber extending at an angle thicknessis provided, and inlet‘ and outlet tuyeres
35 to said hopper, means intermediate said hopper , ' in opposite walls of saidchamber for providing a
and combustion chamber ‘for feeding fuel from
said hopper to said combustion chamber and [for
positively moving the body of fuel therethrough,
said feeding means and combustion chamber. be
ing so constructed and arranged as to continually
draft which is'throughout substantially at right’
angles to the direction of movement of said fuel,
theret?rough.
'wns'ronu. FULTON-v.1
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