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Jan. 14, 1947.
H. |-:. MALONE ETAL
‘
2,414,112
COMBUSTION CONTROL
Filed June 23', 1941
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INVENTORS
HUMER E. MALDNE AND
ELIFFURD HUTEHI/{IEE
BY
m’ ATTORNEK
.
-2,414,11:é
?re device which is indicated as a timer 22, this
timer having a synchronous motor ‘£3 which is
connected across line wires l6 and I1, driving
3 6'1 I
4
to element 51 by a rivet 65'. This heater may’
also be backed by a copper strip 65 which is also
secured to the element 51 by a rivet 65', the ends
of this strip extending through holes in element
25 connected in parallel with thermostat l8. Ll 51 and being bent inwardly as shown. This serves
to conduct heat from the heater to element 51
This timer serves to operate the stoker independ
even when this element is ?exed, for permitting
ently of the thermostat for short periods which
quick heating of this element.
are sui?cient to maintain the ?re alive during
The base 5| may also carry a terminal board 66
mild weather when the thermostat remains sat
which is secured to the side walls 52 and 53 by
is?ed for long periods of time.
brackets 61. This terminal board 66 carries ter
The stoker I also includes an air control de
minals 68 and 69. It also may carry a portion of
vice generally indicated as 28, the details of which
a switching mechanism for the heater 64. This
are shown in Fig. 2. Referring to this ?gure, an
switching mechanism may consist of a pair of
air d_amper 23 is located within the air duct 5
spring contact blades 16 and 1| which are car
and is ?xed to a pivotally mounted shaft 30 which
ried by a screw 12, these blades being spaced
extends through the side of the duct, this shaft
apart by an insulating spacer 13, and being
being secured to a disc 3| which forms a part of
spaced from the panel 66 by a spacer 14. A rigid
a motion transmitting means. The shaft 36 also
blade 15 is preferably located adjacent the spring
includes a ratchet wheel 32 which is free to ro
blade 16 for limiting upward movement of this
tate with respect to the shaft. The disc 3| car
blade. The blade 1| is adapted to be pressed into
ries a pair of pawls 33 and 34, which pawls have
engagement with the blade 10 by means of an
faces 35 and 36 which are adapted to engage the
operating member 16 which is secured to the
teeth on the ratchet wheel 32. The paw-s 33 and
cantilever portion 6|. The position of the free
34 are carried by pivot pins 31 and 38 which are
end of element 16 may be adjusted by means of
secured to the disc 3|. The pawls 33 and 34 also
a cam 24 which operates a switching mechanism
include extension portions 39 and 40 between
which extends a compression spring 4| ,
This
spring urges both pawls toward engagement with
the teeth on ratchet wheel 32. The pawls 33 and
34 extend beyond the edge of disc 3|, the pawl 33 .
being adapted to engage a ?xed stop member 42
which may be secured to the air duct 5, and the
pawl 34 being adapted to engage an adjustable
stop member 43. This stop member 43 may be
carried by a plate 44, this plate being pivoted to
the shaft 36 and having an arcuate slot 45
therein for receiving a set screw 46 WillCh screws
into the air duct 5. This arrangement permits ad
justment of the stop member 43 to any desired
position, the screw 46 then being tightened for
looking it in such position. If desired the duct 5
and the plate 44 may carry suitable indicia 41 for
indicating the position to which the damper is ad
justed to open.
The ratchet Wheel 32 is rotated by means of a
thermal damper operator generally indicated as
56. This operator may consist of a base 5| which
is mounted on the duct 5 and which is provided
with out-turned portions 52 and 53 which form
the side walls of a housing. A suitable cover for 50
the housing may be screwed thereto by means of
screws 54. Located within the housing is a ther
mostatic actuator or operating unit generally in
dicated as 56.
This unit may include a ?rst bi
an adjusting screw 11.
When the thermostatic
element formed of bimetal elements 51 and 60 is
cold, the parts assume the position shown in
which the contact blade 1| is pressed into en
gagement with contact blade 16, this blade at this
time being pressed away from its stop 15. As the
thermostatic element heats up, the cantilever
portion 6| rises and the switch operating member
16 rises correspondingly. During this movement
the contact blades 10 and 1| move upwardly to
gether and remain engaged. However, upon con
tinued movement the blade 16 engages its stop 15
so that upon slightly further movement of the bi
metal element the contact blade 1| disengages the
contact blade 16. It will be noted that the ter
minal 68 is connected by a wire 80 to wire 20 (in
Fig. 1) and the terminal 69 is connected by wire
8| to the ground wire 2|. This ground terminal
69 is attached by a lead 82 to the center of heater
64. The terminal 68 is attached directly to one
portion of the heater 64 by a lead 83 and is also
attached by a lead 84 to the spring blade 1|, the
cooperating spring blade 10 being attached by a
lead 85 to the other end of heater 64.
Operation
With the parts in the positions shown, the
room thermostat I8 is satis?ed and the relay 8
is deenergized, thus deenergizing the stoker m0
tor 6 and also the electric heater 64 of the
damper operator. The thermostatic element of
the damper operator is also cool which causes
the cantilever portion 6| to assume the position
metal element 51 which is attached to the wall
portion 53 by means of a bracket 58. The other
end of element 51 is attached to a spacer 59 which
in turn is attached to a second bimetal element
shown in which the damper 29 is in closed posi
60. The elements 51 and 60 are turned oppo
sitely so that the position of the free end of 60 tion. At this time the contact blade 1| is
pressed into engagement with contact blade 10
element 66 is determined by the cumulative ef
and thus both portions of the heater 64 are con
fect of both elements. The free end of element
nected in parallel with the stoker motor 6. When
60 is attached to a cantilever portion 6| which is
the room thermostat l8 calls for heat, the relay
attached by a link 62 to a pin 63 secured to the
8 is energized which in turn energizes the stok
ratchet wheel 32. The operating unit 56 also in
er motor 6 and both portions of the heater 64.
cludes a center tapped electric heater 64. When
The stoker therefore feeds coal to the retort 2,
this electric heating means is energized the ele
increasing the thickness of the fuel bed and at
ments 51 and 60 warp for causing upward move
the same time agitating the coal in the bed so
ment of the cantilever portion 6|, which through
that any free ash may be shaken down into the
the link 62 causes clockwise rotation of the ratch
bed. With both sections of the heater 64 ener
et wheel 32. When the electric heater 64 is deen
gized, the thermostatic actuator becomes heated
ergized the bimetal elements cool and return to
relatively rapidly, which causes’ upward move
the position shown, thus causing counterclock
ment of the cantilever portion 6| and clockwise
wise rotation of the ratchet wheel 32. Preferably,
rotation. of. the ratchet wheel 32. .Due ,to a tooth
the electric heater 64 is secured at its mid-portion
arrinrra
on ‘this ratchet‘ wheelengagingthesnriace ‘66 ‘of
pawl 234 ‘ this clockwise movement for ‘the ratchet
6
trol velf-Ethel opening and lclosing movements of the
damper. It
also ‘be apparent {that the an
wheel '32 'causes ‘simdltaneous?clockwise ‘move;
rangement above described provides ‘for utiliza
moving “the damperllg toward ‘open pas‘ ion.
tion of- a maximum ramountso'f i'heat ‘upon initial
movement of ‘the damper, the Theater <then ‘rbeing
partially deenerg-i-zed ‘until movement {of :the
ment of ‘the ‘disc, ‘3 I‘ *and damper ‘i249, thus-(slowly
when ‘the damper is rotated to vapproximate'lly
“the predetermined maximum openpo'sition 'as
determined‘ by the ‘adjustment of plate 3“ Athe
damper in the opposite direction is :d'esi-red.
arrangement conserves ‘on leurrent :con
pawl’34 engagesjs'top’Q-‘sv Upon slightlyi’ifurther
rotation of ‘the ‘disc *31 ‘the pawl 341s caused to
ride clear of "the‘ratchet ‘wheelr32. ‘Consequently
sumption and reduces ‘the ‘running temperature
10
thera‘tc'het wheel 32 is ‘now 'free 'to'rotateifwhi'ch
addition, :this arrangement increaseslrthe “flexi
permits "continued 1movement of ’'the *bimetal “ele
bility “in timing 3of the device.
m'anyivaria‘tions may Joe/made from the em
ment “under ‘the action eras ‘heating ‘means.
This‘ arrangement prevents any straining "of'ithe
15
bime'ta'l "element. ‘When ‘the bimetal element
warps tO'a‘poin‘t "in~which:the contact blade“
is permitted to disengage ‘blade {1i}; ‘ther‘rijght
‘hand “portion of v‘the "heater '64 is‘ ‘deen‘ergizéd.
This *reducesjth‘e running ‘temperature ‘of "the
‘
bodimentsilillus'trated withoutdeparting from the
scope ‘~ of ‘the ‘ invention, it is (‘desired "to ibe iilim'ite'cl
only 1by ‘the “scope of ithe appended claims.
‘What-is claimed is:
1. In a control system for a stoher ‘having ‘fuel
feeding means :and ‘air :feeding means, the com
bina‘tiomoLra controllerior startingand stopping
the "fuel ifeedin‘g means, a‘damper forvcontr‘olling
thermostatic ‘element 'and?al's'o“ prolongs 'the life
Crasher-e4.
ofithe thermostatic relemen‘t, thereby increasing
the Eli'fe io‘f this [element and of the ‘heater. in
I
"When ‘the room thermostat 1,8 "becomes "satis
head “the relay *8 is deenerg‘ized, "which “stops the
Stoker ‘motor 5 and ‘also :deen'ergizes ‘the ‘heater
Ed. ‘The ‘thermostatic ‘element ‘and ‘heater, due
to the thermal inertia thereof, “remain not for a
period of time after‘the ‘Stoker stops, rand-con
seguently the damper ‘~29 remains open for ‘a
the air ‘xfeeding “means, ‘a thermostatic element
having electric "heating means therefor, :a
damper operating element, motion {transmitting
means ‘between said thermostatic element ‘and
said? damper operating element,‘ said :motion
transmitting “means rcomprising a *firstrmember
attached to the damper : operating element randa
period "of time. ‘This permits 'a‘ supply of air "to 30 second member @ cooperating with :the i?rst 'mem
her and :attached Ito the thermostatic ielement,
air-to‘the'lfuel ‘bed forburning o?-the‘vola‘tile ‘con
means ?for causing said :second member ‘*to move
stituents of the ‘green coal‘snbriliedto‘thé fuel
the'?rst'member upon initial imovementsof rthe
bedjustbeforethe sto-ker stopped. "*l’h'is-delay‘in
second ‘member in (either direction @while {per
the l?re ‘by natural ‘draft, “which eservess‘tor-supply
closing "of thei'damper 29 ‘fOHQWiIlg ‘stopping ‘of
mitting continuedmovementof'the. secondmem
the *‘stoker “thus serves ‘to reduce smoking. ' At
this time the end~ofipawl§3~3 is disengaged "-from
the‘rs'top 4-2 ‘and ‘consequently thesurface '35 of
this pawl'is-in engagement Witha-tddth-omthe
ratchet wheel. '-When‘-the 1therinostatic ‘element
‘begins ‘cooling, the cantilever ‘portion 6-1 moves
ber fin 5either direction “after ‘movement :of ‘the
?rst ‘member in 'the ‘corresponding direction 5is
stopped, and means for energizing Eor :deenergiz
ing said electric heating means “to cause -move
40 ment of the vdamper to ‘air retarding iposition
whentheffuelgfeeding means isou‘t of operation
and 'for'causing‘movement of the damper to air
downwardly causing ‘counterclockwise rotation
o'fithe ratchet wheel'fi32pan'd due ito lthe engage
ment 1o‘f-“pawl'73‘3 therewith, “the disc iill rotates
correspondingly ‘for rotatingl‘the damper ~=toward
closed ‘position. *When the 'damperYZB ‘reaches
the predetermined closed vposition ‘the pawl 73-3
feeding position when “the fuel feeding means ‘is
in operation.
45
bination of, a controller 1'for starting ‘ and stop
engages‘ the istop-?fz, and thus 5further rotation
ping the =rue1 ‘feeding means, a-damper forcon
trolling the air feeding means, a thermostatic
vof the ratchet Wheel 32 causes fthe \pawlft'yto
ride clear ofithe-ratchetwheell aslshown for per
element having ‘' electric ‘ heating =means therefor,
mitting free movement 10f this wheel; 3A5 'a ‘re
sult :the thermostatic element is free to ‘return
to‘ its normal» cold ‘position ‘as- shown, without, any
a damper operating element,‘motlon‘ltransmitting
means ‘between ‘said thermostatic element and
said damper "operating ‘element, said motion
stress beinglplaced:on=thiseelementlor other parts
of --the motion transmitting means! ‘During the
transmitting 'means ‘comprising a ?rst member
attached to the "damper "operating‘element and‘a
cooling :movement of‘ the thermostatic ’ element
second member cooperating with tthe ‘?rst ~mem
her and attached to ‘the thermostatic element,
means ‘for limiting movement of the/damper in
the switch/operating memberi'l?ipresse's contact
blade 11%| "into ‘engagement With‘blade ‘10, further
downward -movement of 1member ‘16 ‘resulting "in
?exing 'o’flboth'blades asshown.
'
‘lFr‘om-the above , description it vwill-be apparent
that the 110st motion transmitting ‘means serves
to ipermitl'freemovement- o'f the‘lthermostatiorele
ment rafter ' the damper ‘is shifted to "running “p0
12*. In a=coritrol¢system~for1a Stoker-having fuel
feeding meansr'andv'air feeding -means, thecom
closing direction, ‘ adjustable ‘limiting means for
60
limiting movement of the damper ‘in opening
direction, ‘means " associated with ‘said ?rst ‘and
second'members and arranged“ to permit the‘ sec
ond member‘ to continue movement under ‘ the in
?u'ehcefdf-said “thermostatic element after move“
s'ition, ‘this "serving to prevent is'train‘ing o‘f'the 65 ment oi’ the ?rst vmember is limited by one of
element. This same arrangement also provides
said ‘limiting ‘means, while causing immediate
forlim'mediate'movement of ‘~the'~damper one way
movement "of "the ‘?rst member with the < second
or ‘the other, ‘with initial ‘movement of'the ither;
member upon initial movement l-of the second
mostatic element inione direction or‘the other,
member 'in'the ‘opposite direction, ‘and meansfor
irrespective of ‘the actual temperature ‘of the 70 energizing or “deenergizing said electric ‘heating
thermostatic element. This arrangement "pro
meansto cause "movementof “the ‘damper ~to-air
vides for‘actuating the damper by (change-in
temperature of \the thermostatic element. "This
automatically Jcon'ipensates if-or-‘the i'e?ectl‘of ame
b'ient ‘temperature and‘als‘o provides better ‘con
‘retarding position when-the fuel feedingmeans
lsout of ‘operation’ and for causing-movement ‘of
the ‘damper-to "air-"Teeding-‘positiom when 1 the Ifuel
feeding ‘means *‘is liniop'eration.
2,414,112
7
3. In a control system for a stoker having fuel
feeding means and air feeding means, the com
bination of, a controller for starting and stop
ping the fuel feeding means, a damper for con
trolling the air feeding means, stop means for
limiting movement of the damper, a thermostatic
element having electric heating means therefor,
said electric heating means being controlled with
the stoker and changing in temperature when
the stoker is stopped or started, and means in
limiting movement of the damper in closing
cluding
direction, a thermostatic element, means for
causing said thermostatic element to rise in tem
means between the thermostatic element and
self-adjusting
motion
transmitting
damper for causing movement of the damper
away from said stop means upon initial reversal
perature when the fuel feeding means is placed
into operation and to fall in temperature when 10 in temperature of the thermostatic element and
irrespective of the actual temperature thereof.
the fuel feeding means is placed out of operation,
8. In a control system for a stoker having fuel
and self-adjusting motion transmitting means
feeding means and air feeding means, the com
between the thermostatic element and damper,
bination of, a controller for starting and stop
said motion transmitting means being con—
ping the fuel feeding means, a damper for con
structed and arranged to cause movement of the
trolling the air feeding means, a thermostatic
damper away from said stop means toward air
element having electric heating means there
feeding position upon initial rise in temperature
for, said electric heating means being controlled
of the thermostatic element‘ and irrespective of
with the stoker and changing in temperature
its actual temperature.
4. In a control system for a stoker having fuel 20 when the stoker is stopped or started, adjustable
stop means for limiting movement of the damper
feeding means and air feeding means, the com
in air feed increasing direction, and motion
bination of, a controller for starting and stop
transmitting means between said thermostatic
ping the fuel feeding means, a damper for con
element and said damper, said motion transmit
trolling the air feeding means, stop means for
limiting the movement of the damper in opening 25 ting means including means for permitting con
tinued movement of the thermostatic element
direction, a thermostatic element, means for
after movement of the damper is stopped by said
causing said thermostatic element to rise in tem
adjustable stop means, and for causing move
perature when the fuel feeding means is placed
ment of the damper in the opposite direction
into operation and to fall in temperature when
the fuel feeding means is placed out of opera 30 .upon initial movement of the thermostatic ele
ment in the opposite direction and irrespective
tion, and self-adjusting motion transmitting
of the temperature of said thermostatic element.
means between the thermostatic element and
9. In a control system for a stoker having fuel
damper, said motion transmitting means being
feeding means and air feeding means, the com
constructed and arranged to cause movement of
bination of, a controller for starting and stop
the damper away from said stop means toward
ping the fuel feeding means, a damper for con
air retarding position upon initial fall in temper
trolling the air feeding means, a, thermostatic
ature of the thermostatic element and irrespec
element having electric heating means therefor,
tive of its actual temperature.
said electric heating means being controlled with
5. In a control system for a stoker having fuel
feeding means and airfeeding means, the combi 40 the stoker and changing in temperature when the
stoker is stopped or started, adjustable stop
nation of, a controller for starting and stopping
means for limiting movement of the damper in
the fuel feeding means, a damper for controlling
air feed increasing direction, and motion trans
the air feeding means, stop means providing a
mitting means between said thermostatic ele
limited range of movement for the damper, a
ment and said damper, said motion transmitting
thermostatic element arranged to change in tem
means including means for permitting continued
perature upon starting and stopping of the
movement of the thermostatic element after
stoker, and self-adjusting mechanical motion
movement of the damper is stopped by said ad
transmitting means for transmitting motive
justable stop means.
force from the thermostatic element to the
10. In a control system for a stoker having fuel
damper, said motion transmitting means includ
feeding means and air feeding means, the com
‘ing means for causing movement of the damper
bination of, a controller for starting and stop
from said stop means upon initial reversal in
ping the fuel feeding means, a damper for con
temperature of the thermostatic element in one
trolling the air feeding means, a rotatable mem-_
direction and irrespective of the actual temper
55 ber attached to the damper for actuating the
ature of said thermostatic element.
same, a wheel adjacent the rotatable member, a
6. In a control system for a stoker having fuel
.pawl pivoted to the rotatable member and en
feeding means and air feeding means, the com
gaging the Wheel, a thermostatic element ar
bination of, a controller for starting and stop
ranged to change in temperature when the fuel
ping the fuel feeding means, a damper for con
trolling the air feeding means, stop means for 60 feeding means is stopped or started for rotat
ing said wheel, and a stop engaged by the pawl
limiting movement of the damper in both direc
when the damper is moved to a predetermined
tions, a thermostatic element arranged to change
position for forcing said pawl away from said
in temperature upon starting and stopping of the
,wheel for permitting continued movement of the
stoker, and means including self-adjusting mo_
tion transmitting means between the thermo 65 thermostatic element while the damper remains
static element and damper for causing move
stationary.
ment of said damper from either limit of its range
of movement upon an initial reversal in temper
ature of said thermostatic element and irrespec
tive of the actual temperature thereof.
7. In a control system for a stoker having fuel
‘feeding means and air feeding means, the com
bination of, a controller for starting and stop;
ping the fuel feeding means, a damper for con-_
trolling the air feeding means, ‘stop means for
11. In a control system for a stoker having fuel
feeding means and air feeding means, the combi
nation of, a controller for starting and stopping
the fuel feeding means, a damper for controlling
the air feeding means, a rotatable member at
tached to the damper for actuating the same,
a wheel adjacent the rotatable member, a pair
of pawls pivoted to the rotatable member and en
gaging the wheel, said pawls being arranged to
2,414,112
drive the rotatable member in opposite directions,
a ?rst stop engaged by one of said pawls when
the damper is moved to a ?rst predetermined
position for forcing said one pawl away from said
wheel and a second stop engaged by the other of
said pawls when the damper is moved to a second
predetermined position for forcing said other
pawl away from said wheel.
10
wheel, a pawl pivoted to the rotatable member
and engaging the wheel, a stop engaged by the
pawl when the rotatable member reaches a pre
determined position for forcing the pawl away
from the wheel thereby permitting continued
'movement of the thermostatic element while the
rotatable
member
remains
stationary,
and
means between the wheel and rotatable mem
12. In combination, a rotatable device to be
ber for driving the rotatable member in the
positioned, a. rotatable drive member for driving 10 reverse direction upon rotation of the wheel in
said device, a wheel adjacent said drive member,
the reverse direction.
a pair of pawls pivoted to the rotatable drive
15. In combination, a wheel, means including
member and engaging the wheel, said pawls being
a thermostatic element for rotating the wheel in
arranged to drive the rotatable member in op
one direction on rise in temperature and for ro
posite directions, a thermostatic element for ro 15 tating the wheel in the opposite direction on fall
tating said wheel, a ?rst stop engaged by one of
in temperature, a rotatable member adjacent
the pawls when the rotatable device reaches a
said wheel, a pawl pivoted to the rotatable mem
?rst predetermined position for forcing said one
ber and engaging the wheel, a stop engaged by
pawl away from the wheel and a second stop en
the pawl when the rotatable member reaches a
gaged by the other of said pawls when the rotat 20 predetermined position for forcing the pawl away
able drive member reaches another predeter
from the wheel thereby permitting continued
mined position for forcing said other pawl away
movement of the thermostatic element while the
from the wheel.
rotatable member remains stationary, and means
13. In combination, a wheel, a thermostatic
for driving the rotatable member in the reverse
element for rotating said wheel, a rotatable meme
direction upon rotation of the wheel in the re~
ber adjacent the wheel, a pair of pawls pivoted to
verse direction.
the rotatable member and engaging the wheel,
16. In combination, a wheel, means including
said pawls being arranged to drive the rotatable
a thermostatic element for rotating the wheel in
member in opposite directions, a ?rst stop en
one direction on rise in temperature and for ro- "
gaged by one of the pawls when the rotatable 30 ,tating the wheel in the opposite direction on fall
member reaches a ?rst predetermined position
in temperature, a rotatable member adjacent said
for forcing one pawl away from the wheel, and
wheel, a pawl pivoted to the rotatable member
a second stop engaged by the other of said pawls
and engaging the wheel, and a stop engaged by
when the rotatable drive member reaches an
the pawl when the rotatable member reaches a
other predetermined position for forcing said
predetermined position for forcing the pawl away
other pawl away from the wheel.
from the Wheel thereby permitting continued
14. In combination, a wheel, means including
movement of the thermostatic element while the
a thermostatic element for rotating the wheel in
rotatable member remains stationary.
one direction on rise in temperature and for ro
tating the wheel in the opposite direction on fall 40
in temperature, a rotatable member adjacent said
HOMER E. MALONE.
CLIFFORD HOTCHKISS.
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