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Патент USA US2404211

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Patented July 16, 1946
2,404,211 '
UNITED STATES PATENr o FFICE
`2,404,211
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,
a
FURNAoE sToKER
"
v
William P. Biddle, Jr., and Hugh W. Sanford, Jr.,
Knoxville, Tenn., assignors to Hugh W. San
ford, Knoxville, Tenn.
,
Application December 2, 1941, Serial No. 421,356
17 claims. (o1. 1ro-_109)l
The invention relates generally to furnaces and
has for an object to provide a novel form ofstoker
mounted on the door of a furnace and effective
to mechanically feed solid fuel through said door
and onto the fire bed in the furnace.
Furnace door mounted /stokin-g equipments
have been provided hereto-fore, but these have en
p
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tion >for aiding in .the distribution of .the charge
of fuel over the lire ‘bed in the furnace;
Another object of the invention is to provide
in a Stoker of the character stated a fuel sup
porting and distributing plate which. is pivotally
connected to the pusher and so engageable with
fixed supporting means as to be positioned gen
joyed only limited public approva1 because of
erally horizontally as a .fuel supporting shelf be
various faults therein such as the complicated and
neath the yieldable gate when the pusher is re
expensive nature of their construction and oper 10
tracted, and movable to a forward and down
ation, lack of proper control lof the actual in
wardly inclined position extended in fuel dis
feeding of the solid fuel, and inability to handle
tributing position into the interior of the furnace
when the pusher is projected.> `
without jamming. It is the purpose of the present
Another object of the invention is to provide in
invention to provide an improved stoker struc 15
a Stoker of the character stated power operated
ture in which all of these objectionable charac
means for slowly oscillating the fuel feeding
teristics are avoided.
pusher and including .a motor andcrank and link
In its more detailed nature the invention re
connections for transmitting the rotary »motion
sides in providing an improved form ofl furnace
from the motor in theformof- oscillatory motion
door mounted s'toker comprising a housing rigid 20 to
the pusher,- said connections- also including
ly mounted on the door, a hopper supported on
pawl `and ratchet wheel devices.
the housing and having a> gravity disch-arge
Another object of the invention is to `.provide in
throat extending downwardly into> the housing,
a
stoker
of =the character stated, :movement trans
said door and housing having registering openings
large lumps or particles of fuel or foreign matter
mitting connections including lost motion devices
therein adjacent the throat and communicating 25. effective to enable adjustment `.of »the stroke im
with the interior of the furnace, `a yieldable gate
parted to the pusher without altering theforward
in part defining the portion of said throat nearest
or fuel charging stroke limit of the pusher.
said openings and yieldable to permit passage o-f
With the .above and` other objects in view vthat
fuel lumps or large particles of foreign matter and
will hereinafter appear, the nature of the in- ’
to prevent excessive feeding. of fine coal from the 30 vention will be more fully understood by follow
upper part of the hopper at the time that the
ing the detailed description, `the appended claims,
yieldable gate is engaged by a coal lump, and aY
and the several views illustrated in the accom
fuel feeding pusher reciprocable across the throat'
Danying drawings.
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just beneath said gate and effective upon each
In the drawings:
forward stroke to deliver a charge of fuel through
as Figure 1 is a vertical cross section of a furnace
said openings into the furnace.
with the invention mounted on the door thereof,
Another object of the invention is to provide
the normal, retracted position of the »pusher bein-g
a stoker structure of the character stated in
shown in dotted lines, ,and the fuel feeding and
which the pusher is oscillatably mounted and in
distributing position being illustrated in full
cludes an arcuate plate portion the are of which 40
is struck from the center about which the pusher
oscillates and which plate is effective to close the
lines.
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.
Figure 2 is a vertical cross sectional view taken
on the 4line 2-2 on Figure 1.
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throat as the pusher moves forward, and in which
Figure 3 is an enlarged ,detail vertical cross
the yieldable gate comprises Aa, plurality of ñexible
view taken on the line 3--3 on Figure 1.
spring steel vfingers having their lower ends freely l sectional
Figurev 4 is a detail Vertical longitudinal sec
suspended toa point just short of the path of
tional view taken on the line 4_4 on Figure 3.
movement of said plate.
In the exemplary disclosure of the invention
Another object of the invention is to provide a
herein
illustrated the furnace 5 embodying the
stoker structure of the character stated in which
usual jacketed Walls includes a ñre bed support
a fuel supporting plate is attached to the pusher 50 ing grate 6 which is accessible through `a firing
in position for forming with the pusher a pocket
opening 1, said opening being normally closed by
or supporting shelf for receiving and supporting
the usual hingedly mounted door 8. This furnace
fuel when the pusher is retracted, and movable
structure may be of any conventional form.
with the pusher, when the latter is projected to
In the practical development of the invention
deliver a charge of fuel in the furnace, to a posi 55 there is provided a housing or supporting struc
.
f
ture 9 which is securely bolted or'otherwise se- '
1 cured tothe hinged doorß and equipped with an
` opening registering with the ñring opening 1 and
a'n opening I0 formed in the door 8.
A hopper `
II is supported on the housing 9 and includes a
gravity discharge throat- I2 which depends in the l
housing Vvadjacent the registeringV openings`>
and
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The plate 43 extends the full width of _the pusher
I8, I9 and is slightly less in Width than the open
ing I0 which communlcates between the dis
,
The foremost wall of the hopper terminates, as
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4
edge 45 curved slightly upwardly in the manner
clearly illustrated in Figure-l of the drawings. ì.
The normal or retracted position of the pusher
I8, I9 is illustrated in dotted lines in Figure l
of the drawings, and the forwardly projected or
fuel feeding and distributing position of the
pusher is „illustrated in Afull lines vin Figure 1.
at I3, a short distance below the top of the heus-¿JQ` charge throat I2 and the interior of the furnace
ing 9, and this wall is supplemented by a yield
' structure 5 through the firing door 1. When Ythe
able wall or gate structure generally designated-1
Vpusher I8, I9 is in its normal, retracted position
I4 and composed of a rigidly mounted bar-I5 and
the plate 43 rests ingenerally horizontal position
de enclin closel s aced spring steel-fingers I6
p
g
y p
i
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_,
_
_
_upon a cross rod 46 or other suitable supportmg
'
which depend from said bar..
means mounted on the housing 9, and when the
An oscillatable fuel feeder or pusheris pivotally , _,
pusher I8, I9 is inI its forwardly projected or fuel
supported, as at I1, in the housing beneath the
feeding and spreading position, the, plate 43 is
discharge throat I2, and this pusher includes la
supported on a similar cross rod or supporting
3 ` flat front plate I8 and an arcuate top plate I9,3
means 41 in the ydownwardly and forwardly in
the arc> ofthe top . plate `>being struck from. the 20 clined position illustrated in full lines in Figure 1 ,
center about _whichpthev pusher oscillates. , It _will‘
fori effectively »distributing the „fed fuel charge ,
be Aobserved by referenceto Figure lof the draw
over _the Yfire bed.
ingsthatlthe _flexible fingers I6 comprising the;`
yieldable wall ,I4__wh,ich defines theY front portion ,
of the throatway I2 extend'downwardly> to aV point
immediately. above the path of travely of the _arcu
at@ plate
lit
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YB'y mounting the plate 43 in the manner stated
and positioning thev supporting elements 46, 41’
in the mannerhereinbefore described, when the
pusher I8, I9 is in its retracted position illustrated
in dotted lines in Figure 1, thefrontplate I8 and
Y,
' Acrankarm'ZI) isgsecured to andY depends from
uthe plate 43 together form a pocket or fuel sup
the vpusher'Iß, YI9 and has a driving pin 2l pro
porting shelf at the bottom of the> fuel "discharg
,ing throat I2, and the plate 43 lies in generally
'horizontal position _beneath the lower extremities
of the flexible fingers I6.V VWhen the pusher is
je'cting laterally Yfrom the lower end thereof. The
driving pin 2L extends through a longitudinal slot
22 in the front end of a ldriving link23, the effec
tive length of the ,slot 22being variable through l moved to its forward position the plate 43 swings
the .medium of. a Screw 24 adiustalvlyY mounted in.k forwardly and downwardly, under `control'of the
a bearingr25carried by the link. AV'I'hepurposek 35 supporting elements 46, 41, to the fuel charge
offthis ,adjustment `of the slot length VVwilllloe de
spreading position illustrated in full'lines in Fig
scribed hereinafter.- .At its other end, the _link23
ure l. It will also :be observed by reference to
is connected to _'a crank pin 26 which projectsY
the'dotted. une illustration in Figure 1 that when .
laterallyfroma ratchet ,wheel 21 having _avrela
tively large drivingsurface or periphery V2t! and
which` isV freely> rotatable, on a shaft or bearing
' pin V29 vrigidly, supportedas at 30, on the housing
9*.”_71tfwill`be >obvious that when rotation _is im
parted >tothe wheel 21, this rotary motion will
be transmitted lin the form of oscillatory motion
to the pusher I,8_, I9'throughthe crank and link
connections` 26, 23, 2l and’20. _'
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Forr imparting the desired rotary motion >to the
wheel 21there is providedV a driving arm 3| which
thepusher I8, I9 is in its normal, retracted posi
tion the plate 43 is disposed directly beneath and
Yclose to the upper limit of the firing opening I6
so as to effectively close-that opening and guard
against any possibility of fuel in the hopper throat
I2 being ignited by radiant heat from the ñre bed>
45
in the furnace. ,
By reason of the provision of theyieldable wall
or gate I4 and the relation thereof to the hopper
discharge throat I2 and the furnace fuel charg
ingopening I0, the feeding of fuel charges can
' is oscillata'bly mounted, as atv 32„on the shaft 29, 50 be accomplished without any danger of jamming
and this arm has a1 driving pawl 33 lpiyoted there
on, as at 34, 'in position for engagingA in driving
of parts by reason of‘engagement of the pusher
relation with the periphery 28,` of the wheel 21.
The Vpawl, is disposed in the manner best illus
trated in Figure 4 of the drawings so that it will
dragjfreelyn _over the wheel periphery when the
in the fuel, movement of which is being obstruct
ed by contact of unyielding surfaces. In other
with coal lumps or any foreign particles contained `
Words, should.V the pusher move forwardly a charge '
of fresh fuel including one or more large lumps,
and possibly a railroad spike, astone or a similar
arm, is imovedltothe left; as viewed in Figures'l ,
and 4, and will engage in driving'relation with
bit lof foreign matter, Vthe wall or gate I4 or por
saidv periphery when the arm is moved to the right .
therebytoimpart' rotation in a clockwise direc
tion to said‘wheel. rIfhe arm 3|Y is slotted, as4 at
35, to adjustablyreceive a shoulder bolt 36V which
is attached to the rvfront end of a. driving link 31.
Theother end of the link 31 is attached to a
crankpin 38 which projects laterally from a driv 65
ing- diskr 39 carried by the shaft 40 of a motor 4I
rigidly" supported, as at 42, upon the housing 19.
It Vv_villloe obvious that rotary motion of lthe disk
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It is desired that the pusher I8,`I9 shall have
trated in Figure 1 of the drawings. It is also de
sirable that the length of the stroke movement
imparted to the pusher I8, `I9 be variable so that
the amount of each fuel charge fed into the fur
nace at each forwardr movement of the 'pusher
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VA fuel supporting and feed distributing'or‘
spreadingplateAS Vis hingedly attached, as at 44,
plate is. generally ñat in shape and has its >front
large particle.
a constant, that is, an unvarying forward stroke
movementto the arm 3l through the crank and
tothe pusher plate I8, land this hingedlyfmounted
of such lumps lor particles without jamming of
the parts and without free and uncontrolled out
pouring Vofthe fuel particles of lesser sizes at
opposite sides of a jammedy coal lump or other
limit, this limit-being the full line position illus
3.9v Vwill be transmitted in the form» of oscillatory'
link connections 38, 31V and 36.
tions thereof are free to yield and permit passage f
maybe varied. This is accomplished‘by adjust
V75
ment'of the screw 24 and the resultant variation
2,404,211
in the esecuve length ofthe slot 22 in the link .
23. Adjustment of the effective length 'of this
slot provides for a greater or lesser amount of
lost motion in the pin and link connection 2I, 23.
It is to be understood that when thezpusher I8,
i 9 is in its non-varying, forwardly projected posi
tion, the pin 2l will be >engaged in the forward
limit of the slot 22. When the link‘23 moves for
wardly to effect a retraction of the pusher, this
retraction willnot start until the variable lost
motion has been taken up and the adjustable
screw 24 engages the pin 2l. By adjusting the
position of the shoulder >bolt 3S in the driving arm
slot 35, the degree of the individual increments
of movement imparted by the arm 3l to the wheel
21. can be varied.
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Itis to be understood that in adoor feed stoker
mechanism of the nature` herein disclosed a sat
isfactory control can *bev effected with a simple
eign matter to permit passage thereof toward said
openings;` and a 'fuel feeding pusher reciprocable
across the throat close beneath `îsaid uprìghtly
disposedyieldable wall and effective upon each
; forward stroke to deliver a charge of fuel from
the throat through said openings and into the
furnace,
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2. A structure as defined in claim 1 in which
the pusher is oscillatably mounted and includes
a substantially arcuate plate. portion the arc of
Which'is struck approximately from the center
about which the pusher oscillates and which plate
is effective in one position of the pusher to close
the throat, and in which the yieldable wall com
prises a supporting bar and a plurality of closely
spaced flexible fingers extending down close t0 but
short of ’contact `with said arcuate plate.
3. A structure as defined in claim 1 in which>
the pusher is oscillatably mounted and includes
thermostat. When the thermostat calls for heat 20.k a substantially arcuate plate portion the arc of
the motor lily is put into operation to impart step
which is- struck approximately from the center
rotation to the wheel 21 and reciprocation rto the
about which the pusher oscillates and which .plate
pusher it. I9 in the manner hereinbefore de
is effective in one position of the pusher to close
scribed, and the motor continues to operate until
the throat, and in >which there is included a fuel
a sufficient amount of fresh fuel has been fed to
supporting and distributing plate attached to the
the ?re to build up heat sufficient to turn off the
pusher, and means for supporting said support
thermostat, It should also be understood that
ing and distributing plate in position for forming
other conventional stoker controls can be used.
with the pusher a pocket for receiving and sup
In addition to the usual thermostat and bonnet
control arrangement, a suitable. mechanism may 30 porting fuel when the pusher is retracted, said
supporting and distributing plate being movable
be employed which provides a certain feed timing
with
the pusher, when the latter is projected to
during periods when the house and thermostat
deliver a >charge of fuel into the furnace, to a
are overheated. The controls which have been
position for aiding in distributing the charge of
' mentioned are conventional, however, and since
fuel
'over the fire bed in the furnace.`
they in themselves form no part of the present
4. A structure as defined in claim 1 in which
invention, further detailed disclosure» thereof is
deemed unnecessary herein.
the _pusher is oscillatably mounted and 'includes
>
It will be obvious by reference to Figure 1 of
thedrawings that when the pusher I 8, VI 9fis in the
retracted position illustrated in dotted lines, the
plate or >shelf ¿if will support the fuel in the hop
per discharge throat IZ and effectively close the
firing opening ill so as to protect the fuel supply
a substantially arcuate plate portion the arc of
kwhich is struck approximately from the center
about which the pusher oscillates and which plate
is effective in one position of the pusher to close
the throat, andin which there is included a fuel
supporting and distributing plate pivotally at-`
tached to the pusher, and means movably sup
fromvradiant heat. As the pusher I8, I9 moves
forwardly on a fuel charging and distributing 45 porting andV guidingV said supporting and dis-r
tributing `plate on the housing `in such manner
stroke, the plate d3 will retain its generally hori-`
that it assumes a generally horizontal position
zontal position until a certain point is reached
beneath the yieldable wall for supporting fuel
late in the forward movement of the pusher and
when the pusher is retracted and moves into a
the plate t3 hingedly mounted thereon. When
forwardly and downwardly inclined position as
this'point is reached, the plate 43 will fall rapidly 50 the
pusher is moved to its projected position
thereby to aid in distributing the charge of fuel
over the fire bed in the furnace.
y
doing will effectively distribute the fuel charge
5. In a furnace wherein is provided a casing
over the rod 19,6 andv onto the rod 4l linto‘the posi
tion illustrated in fulllines in Figure 1 and in .so
on the fire bed.
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y y having a fire bed supporting means and an open
It is to be understood that the details of struc 56" ing through which fuel can be fed onto the fire
ture and arrangement of parts may be variously7
bed, stoking means including a hopper having a
changed and modified without departing from the
gravity discharge throat, means supporting said
spirit and scope fof the invention.
hopper in position for placing the throat adja
We claim:
.
cent said opening, a fuel feeding pusher, means
l.. A st'oking apparatus for a furnace having a
reciprocably mounting said pusher in position for
fire bed; and a firing door opening; a firing door,
a housing carried by said door, a fuel hopper sup
ported by the housing and having a gravity dis
charge throat normally open for delivery of fuel
from said hopper and disposed in said housing,
said ydoor and housing having registering openings
being reciprocable across the discharge throat for ’
feeding fuel charges through said opening into
the fire bed and effective in its forwardly pro~
J'ected position to close said throat, a motor, a
crank driven by the motor, a crank disk, ratchet
and pawl driving connections between the crank
therein adjacent the throat and communicating
kand the crank disk, and a link connected at one
with the interior of the furnace at an elevation
end to the crank disk and at its other end to the
above the fire bed so that fuel discharged through
pusher,
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said throat and delivered through said openings
6, In a furnace wherein is provided a casing
will'fall by gravity onto said lire bed, a yieldable
having a fire hed supporting means and an open
uprightly disposed wall in part defining the _porn
ing through which fuel can be fed- onto the lirevv
tion of the normally open discharge throat near
' bed, stoking means including a hopper having a,
est said openings and yieldable yso as to be dis
gravity discharge throat, means supporting said
placeable byfuel lumps- or large particles of for
hopper in position for placing the throat adjacent
2,404,211
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said' òpenin'gáa fuelfeeding pusher, means re#`
ciprocably mounting'saidï pusher in position for
being reciprocable across the discharge throat for
feeding fuel charges through said opening into
the fire bed and effective in itsforwardly pro
jected position to close said throat, `a motor, a
crank driven by the motor, a crank disk,'ratchet
and pawl driving connections between the crank
and the crank disk, and a‘link connected at one
end to the crank disk and at its other end to thev
pusher, one of said link end connections con,-v
stituting'an adjustable lost motion connection. 1
7. In a furnace wherein is provided afcasing
having a fire bed supporting means ,and an open
ing through which fuel can be fed ontothe ñre
bed, >stoking means including a hopper having a
gravity discharge throat, means supporting the
8"
tribute 'the supported fuel charge over the fire>
bed inthe furnace.
>
10. In a furnace wherein is provided a casing `
having a fire bed supporting means and an open-V
ing through which fuel can be fed onto the fire
bed, stoking means including a hopper having a
gravity discharge throat, means supporting said ' n
hopper in position for placing said throat adja
cent said opening„a fuel feeding pusher, means
reciprocably mounting said pusher beneath said'
throat, Ysaid pusher including a plate portion
effective in one position of the pusher to close
the throat„ a fuel supporting and distributing
plate, and means for supporting said supporting
and distributing plate in. position for forming
with'the pusher a pocket for receiving and sup
porting fuel whenthe pusher is retracted, said
supporting and distributing plate being attached Y
hopper in position for placing the throat adjacent
to the pusher and movable therewith when the
said opening, a fuel feeding pusher, meansoscil
pusher is projected to deliver a Ycharge of fuel
latably mounting said pusher in position for being 20:, into the furnace to a position. for aiding in the
oscillated across said throat for feeding fuel
through said opening, a driving motor including
a driven shaft, a- crank arm projecting fromv the
pusher, driving crank means on said shaft, and
bed in the furnace.
mitted in the form of oscillatory movement of the
hopper in position for placing said Wthroat adja
distribution of the charge of fuel over the fire
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11. In a furnace wherein is provideda casing
having a ñre bed supporting means and an open
25T
power transmitting connections between «the . ing through which fuel can be fed onto the fire
crank arm and said driving crank means whereby
bed, stoking means including a hopper having a
the rotary movement of the shaft will be trans
gravity discharge throat, means supporting said
cent said opening, a fuel feeding pusher, Vmeans
8. In a furnace wherein is provided a casing 30, reciprocably mounting said pusher in generally
having a fire bed supporting means and an open
horizontal position beneath said throat, said
ing through which fuel can be fed onto the lire
pusher includingV a plate portion effective in one
pusher.
;
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bed," and a combination closure door and'stoking
position of the pusher to close the throat, a fuel `
means' mountable and ’removable as a unit over 35 supporting and distributing plate, and means for
said opening and-comprising a hingedly mounted
supporting said supporting >and distributing plate
closure door, a housing carried by said door, a
in position for forming~ with the pusher a' pocket
for receiving and supporting fuel when the pusher
is retracted, said supporting and distributing
fuel hopper supported by the housing and having
a gravity discharge throat normally open for de
„livery of fuel from said hopper and> disposed in 40 platerbeing attached'to the pusher and movable
said housing, said door and housing having
therewith when the pusher is projected to deliver
registering openings'therein adjacent theïthroat
a 'charge of fuel into the furnaceto a position
and communicating with the interior of the fur
for aiding in the distribution of the. charge of
nace, a yieldable uprightly disposed wall in part
fuel overthe fire bed in the furnace, said pusherV
defining the portion of the normally open dis-î
also including a front plate disposed generally
charge throat nearest said openings and yield
able so as to be ldisplaceable by fuel lumps `or
large particles of -foreign matter to permit pas
' uprightly and connected at the foremost edge
portion of the pusher plate portion, and said fuelv
supporting and distributing plate having its place
sage thereof toward said openings, and a fuel
vof attachment with the pusher at a point on said
feeding- pusher reciprocable across thel throat 5.0:., front plate spaced downwardly Vfrom the connec- z
close beneath said uprightly disposed yieldable
tion of said front plateA with the arcuate plate.
wall and effective upon each forward stroke to
12. In a furnace wherein is provided a casing
having a ñre bed supporting means and an open
. _deliver a charge of fuel from the throat through
said openings and into ther furnace.
9. In a, furnace wherein is provided a casing
having a ñre bed supporting means and an open;
ing through which fuel can be fed onto the fire
bed,rand a combination closure door and stoking
means mountable and removable as a unit over
,ing through which fuel can be fed onto the fire
bed, stoking means including a hopper having a
' gravity discharge throat, means supporting said
said opening and comprising a, hingedly mounted
" closure door having an opening therein register
ing with said casing opening, a'hopper having a
gravity discharge throat disposed adjacent said i
registering openings, a fuel feedingpusher re
ciproeably mounted beneath'said throat and in 6,5
cluding a plate portion effective in one position
toclose the throat, a fuel supporting anddis
hopper intposition for placing said throat adja-V
cent said opening, a fuel feeding pusher means
oscillatably mounting said pusher beneath said
throat, said pusher including a substantially
arcuate plate portion the arc of which is struck>
approximately from the center about which the
pusher oscillates and which substantially arcuate
plate is effective in one position tok close the
throat, a fuel supporting and distributing plate,
and means for supporting said supporting and
distributing plate vin position for forming with
the pusher a pocket for receiving and supporting
tributing plate attached to therpusher and ñxedly
fuel when the pusher is retracted said supporting
mounted supporting means on which said _sup-,V
porting and distributing plate rests and effectiveVV fi and distributing plate being hingedly attached
to the pusher and lmovable therewith when the
-to place said plate in a generally `horizontal posi
pusher is projected to deliver a charge of Yfuel
tion -for receiving and supporting fuel when the
into the furnace to a position for aiding inthe
pusher `is retracted and to place said plate in a
distribution of -the charge vof fuel over the ñre
forwardly and downwardly inclined position when
bed Vin the furnace, said pusher also VVincluding , aY
the pusher is projected so as to deliverrand dis
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`front plate connected at the foremost edge por
tion of the substantially arcuate plate and pro
jecting substantially radially with respect to the
center about which the pusher oscillates, and said
fuel supporting and distributing plate having its
hinge attachment with the pusher at a point on
said front plate spaced downwardly from the
connection of said front plate with the substan
tially arcuate plate, and said distributing plate.
supporting means being disposed to support the
distributing plate in such manner that it will
assume a generally horizontal position beneath
the throat when the pusher is retracted and will
move into a forwardly and downwardly inclined
position over said supporting and guiding means 15
as the pusher is moved to its projected position.
13. In a furnace wherein is provided a casing
having a fire bed 'supporting means and an open
ing through which fuel can be fed onto the ñre
îhingedly attached to the pusher, and in which
the supporting and distributing plate supporting
means is disposed close beneath the plate hinge
attachment when the pusher is projected so that
the fuel supporting and distributing plate willl
fall rather rapidly to its forwardly and down
wardly inclined position just as the pusher ap
proaches its projected position thereby to facili
tate distribution of each fuel charge over the ñre
bed in the furnace.
15. A structure as deñned in claim 10 in' which
there is included means for so positioning the
fuel supporting and distributing plate when said
plate is retracted and in the opening through
which fuel can be fed onto the fire bed that it
closes said opening and protects fuel in the hop
lper discharge throat from the direct action of »
radiant heat from said ñre bed.
' 16. A structure as defined in claim 7 in Which
bed, stoking means including a hopper having 20 said power transmitting connections include a
a gravity discharge throat, means supporting said
ratchet wheel having a crank pin projecting
hopper in position for placing the throat adjacent
therefrom, ratchetI and pawl driving connections
said opening, a fuel feeding pusher, means re
between the shaft borne crank and said ratchet
ciprocably mounting said pusher beneath said
wheel, and a link connecting the crank pin of
throat, said pusher including a plate portion 25 the ratchet wheel with the pusher crank.
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effective in one position to close the throat,’a
17. A structure as defined in claim 7 in which
fuel supporting and distributing plate attached ' said power transmitting connections include al
to the pusher, and ñxedly mounted supporting
ratchet wheel having a, crank pin projecting
means on which said supporting and distributing
therefrom, ratchet and pawl driving connections
plate rests and effective to place said plate in a 30 between the shaft borne crank and said ratchet
generally horizontal position for receiving and
wheel, and a link connected at one end to the
supporting fuel when the pusher is retracted and
crank pin of the ratchet wheel and at its othery
to place said plate in a forwardly and downwardly
end to the pusher crank, one said link end con
inclined position when the pusher is projected
nection constituting an adjustable lost motion
so as to deliver and distribute the supported fuel 35 connection.
charge over the ñre bed in the furnace.
`WILLIAM P. BIDDLE, Jn.
14. A structure as deñned in claim 10 in which
the fuel supporting and distributing plate is
HUGH W. SANFORD, JR,
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