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Патент USA US2411703

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Nov. 26, 1946.
2,41 1,703
c. R. BARR
Original Filed Sept. 17. 1940
4 Sheets-Sheet 1
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Nov. 26,1946.
2.41 1,703
<;_ R_ BARR
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Original Filed Sept. 17, 1940
4 Sheets-Sheet 2
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Nov. 26, 1946.
Original Filed Sept. 17. 1940
4 Sheets-Sheet 3
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Nov. 26, 1946.
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Original Filed Sept. 17, '1940
4 Sheets-Sheet 4
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' Patented Nov. 26, 1946 i
1- _
Charles R. Barr, Bellevue, rs‘. ’
Original application September 1'7, 1940. Serial
No. 357,127. Divided'and this application Sep
tember 23, 1944, Serial No. 555,452
5' Claims. ~ (01. ‘1105108)
paddles I mounted on a square drive shaft 1,
the paddle conveyor being constructed in sections,
as shown in Fig. l, with successive sections stag
' This invention relates. to new and usefuli'im
provements in 'stokers and‘ the present application
is a division of an application-serially numbered
357,127, ?led‘September 17, .1940, which has ma
gered, as shown in Fig. '7. The shaft ‘I, is driven
by a pawl and ratchet mechanism, Figs. 2 and 11.
‘The shaft 1 is keyed at 8 and 9, Fig. 11, to a pair
of conically shaped friction disks I0 and 'H which
tured as United States Patent No. 2,359,742,
granted October 10,‘ 1944. It is among the-objects
' of. this invention to'provide a stoker adapted for
feeding a, proper quantity of._coal properly dis
coact with a ratchet wheel I! having teeth is
tributed over the fire‘ bed at a proper time to ob-.
tain maximum e?iciency of combustion through
' that are engaged by a pawl I4, the contact be
10 tween the friction disks i0 and ll .and the ratchet
wheel i2 being adjusted by means of the nut I5
on the end of shaft 1.
The invention will become more apparent fro
a consideration of the accompanying drawings
Suitable clearance i6 is provided between the‘
constituting a part hereof in which like reference
conical disks and the ratchet wheel to assure
15 contact of the‘ conical surfaces of the engaging
characters designate like parts and in‘ which
Fig. l is a rear elevational view of a stoker feed 1
members. The purpose of the friction drive is
apparatus embodying the principles of this inven
to avoid damage to the feed mechanism, par
out the ?re box area.
' ticularly the [paddle conveyor 6 if a large piece
of slate or other foreign element such as ‘iron
Fig. 3 a rear elevational view of the mainframe 20 bars or spikes are .fed from the hopper to the
Fig. 2 a side elevational view thereof; ~ '
7 structure for supporting and housing the feed
paddle conveyor. If, for ‘example, an iron bar
would become lodged in the paddle conveyor, the
Fig. 4 a side elevational view of the ‘stoker
feed mechanism, including the ratchet drive,
would continue to operate without revolving the
Fig. 5 a horizontal cross-section’ partially in 25 conveyor shaft 1. To dislodge the obstruction,
elevation taken along the line 5‘—5, Fig. 4;
‘pawl 14 is disengaged and shaft 1 shaken back '
Fig. 6 a top plan [view diagrammatically, illus- _' and forth by means of lever ‘Ia.
I trating the directional path of the fuel as dis
- As shown in Figs. 2 and 11, pawl I4 is pivot
tributed by the stoker feed mechanism;
'aliy mounted on a crank I‘! that is pivoted on the
Fig. '7 a vertical cross-section partially in ele 30 drive shaft 1. The ‘crank i1 is connectedby a
vvation of a ?re box and the stoker mechanism;
link 18 to a leverv l9 that is pivoted at 20, the
Fig. 8 a top plan view of an adjustable crank;
‘ other end of the‘lever being connected at?! to
Fig. 9 a vertical section thereof taken [along the
a link-22,0116 ‘end of Which is mounted on an
adjustable crank pin 28. Crank pin~23 is driven
Fig. 10 a vertical section partially in‘elevation 35 by shaft 24 that is coupled to a variable speed
of the crank ofFlg. 8 taken-along the lines I ll-“h '
Fig. 8:. and
Fig. 11 a crossesection of the friction feed drive ,
taken along the line i l-i I, Fig. 2. _
With reference to Figs. 6 and 7 of the draw
transmission generally designated by the refer
ence chsracterEB, and which may be of the type
employed in automotive vehicles having a shifting
lever 28, as shown in Fig. 1. Transmission 25 is
40 coupled to a gear reduction mechanism gener
ings, it is the primary object of the stoker feed _ ally designated by the numeral 21 that is driven
mechanism to distribute the coal or wcoke over the
by an electric motor 28 or any other suitable
?re bed uniformly throughout the length and
prime mover.
breadth thereof, the arrows in Fig. 6 illustrating
It'is to be noted with reference to ‘Fig. 1 that
the path of the coal as it leaves the stoker, which 45 the stoker frame may be constructed of a one- .
may be generally designated by the numeral i.
piece steel casting to which all the operating parts
Fig. '7 demonstrates the horizontal path of the
are rigidly connected to provide adequate sup
- coal as it leaves the spreader apron 2 of the stoker,
the numeral 3 designating an evenly distributed ‘
bed of coal on a stationary grate or hearth t.
port and the drive mechanism is of rugged con
struction to eliminate wear on the operating
parts. The coal may be fed at a rate suitable
The distribution of the coal over the ?re bed, as
shown in Figs, 6 and 7, is. eifected by means of the ‘
for. the particular requirements by the speed
change transmission 25 and by adjustment of
the crank pin '28 which is effected by the ‘struc-_
following mechanism.
The‘ coal is placed in a hopper 5, Fig, 7, and
ture shown in Figs. 3 to 10 inclusive. The nu
is fed by gravity mm the path of a plurality of a meral 29 designates a hub shaped disk which is
and capacity and also gives ‘to each individual
boiler is wide capacity range.
~mounted on the transmission shaft 24 to rotate
therewith. The face of the disk at the center
thereof is provided with a series of square shaped
grooves 20 forming teeth that interact with the
The use of the speed transmission 25 coupled
with'the feed adjustment of the panel conveyor
teeth}! of the adjustable crank 23 to which the
permits rapid change of the rate of fuel feed in
slots strand place it in its adjusted position.
operating requirements.‘
accordance with the needs of the boiler, ‘for ex
connecting link 22 of lever 19 is joined. ‘A pair
ample, if the boiler is rated 100 H. P. and the
of cover plates 32 are bolted to the disk 28, as
fuel consumption is 8 pounds per H. P. per hour,
shown, and are provided with lateral projections
the adjustable crank 23 may be set to feed 800
33 that extend into slots of the crank pin 22.
The crank pin may be set in any of the slots of 10 pounds of coal per hour with the transmission
25 set for normal feeding speed. By shifting
'the drive disk 28 to, vary the thrust in accord
lever 26 to either increase or decrease the trans
ance with the desired rate of feeding through
mission speed, the fuel feed may be correspond- '
the pawl and ratchet mechanism. To effect the
ingly increased. or decreased to get double or half ‘
adjustment, it is necessary to remove the clamp
ing plates 32, remove the crank pin 28 from the 15 the coal feed capacity to meet any particular
takes up very little space at the charging end of
the furnace.
Because of the even thickness of the fuel bed,
it is possible with proper aeration of the grate to
burn slack or the waste product of coal mines
without the formation of clinkers.
Although one embodiment of the invention has
been herein illustrated and described, it will be
evident to those. skilled in the art that various
modifications may be made in the details of con
struction without departing from the principles '
I - effected by a plurality of blast nozzles 35, Fig. 7,
one end of which communicates with a steam
box 38 and the other end with ?ared grooves 31
of the apron 2, Fig. 5. The steam or blast emitted
Thev apparatus is durable and compact and
The clamp plates 32 are then inserted in the slots
. of pin 23, as shown in Fig. 9. and the crank'pin
is held against movement by the interacting teeth
of the pin and drive disk. It is apparent that a
wide range of feed adjustment is provided
through the transmission 25 and the adjustable
crank pin to obtain any desired rate of feeding
the fuel to the fire box.
Distribution of the coal after it is delivered'by
the paddle conveyor 6 to the spreader apron is
herein set forth.
1. In a stoker feed mechanism, fuel feeding
by the severalnozzles may be separately regu
means comprising a feed wheel having groups of
lated by a needle valve is having a stem extend
blades in angular and axially spaced relation
ing through a strap 38, each valve stem being
staggered so that when rotated only one blade of
provided with a grip dd to effect adjustment of
the blast emitted from the nozzles 55. The sides 35 the entire feed wheel isoperative to deliver an
increment of fuel to a predetermined space of the
of ‘the apron 2 are'provided with ?aring blades
ti to permit distribution of the fuel at the front ‘ feeding station, whereby successive charges are
end of the fire box.
Steam or compressed air is
supplied to the chamber 33 through a conduit l2,
delivered from one end entirely across to the '
other end of said wheel, a drive mechanism for
and one end of the chamber is plugged at 43. 40 said feeding wheel including a-shaft, a. plurality
of friction members mounted on said shaft, a
The nozzles 35 may be adjusted to distribute the
drive wheel in frictional engagementtherewith,
fuel over any size fire box and the pressure regu
said wheel having teeth for engagement by a
' lated to distribute the fuel throughout the length
pawl, a bracket mounted for angular movement
of the ?re box.
I _
The operation of the stoker feed mechanism ' on said drive having a pawl for engaging the teeth
of the drive wheel and having a lever, one end of
U is briefly as follows: The stoker is clamped to
which is connected to a crank pin, a driving crank
the charging opening of the furnace, as shown
for said crank pin having adjusting means for
in Fig. 7, and the hopper S is charged with coal
varying the thrust of said crank pin, and a prime:
which, because of the emcient combustion ob
tained by the distribution of the fuel in the ?re 50 mover for rotating said crank head whereby said
feed wheel is subjected to intermittent angular
box, may be of an inferior ‘grade. Motor 28 is
thenenergized and the shifting lever 28 is moved
2. In. a stoker feed mechanism, fuel feeding
to the desired speed position. Power is trans-v
means comprising a feed conveyor having fuel im- '
mitted through transmission 23 to the shaft 24
to rotate the drive disk 28 which revolves to actu 55 pelllng faces in angular and axially spaced rela
tion. which when rotated deliver a unit increment
ate crank pin 23 which has been set on the drive
of fuel successively to different areas of the feed
disk 28 to exert a predetermined angular thrust
ing station, a drive mechanism for said feeding
on lever it through the connecting link 22. As
the lever is oscillates, the pawl housing “is
- conveyor including a shaft. a plurality of friction
subjected to oscillating movement which in one to members mounted on said shaft, a drive wheel in,
frictional engagement therewith, said wheel hav
direction causes pawl It to engage the teeth of
ing teeth for engagement by a pawl, a bracket
ratchet wheel 62, which in turn rotates the
vmounted for angular movement on said drive hav
square shaft ‘i of the-paddle conveyor 8. As the
ing apawl for engaging the teeth of the drive
conveyor 6 revolves, coal is fed to the apron 2
in the path of the steam jets ll! and is lifted 66 wheel and having a lever, one end of which is
connected to a crank pin, a driving crank for said
from the apron and distributed over the fire box >
crank pin having adjusting means for varying:
area, as shown in-Flgs. 8 and._7. By proper ad
the thrust of said crank pin, said crank head hav
justment of the needle valve 3'8,'the necessary
amount of blast is obtained to provide for a uni-' ‘ ing a T-slot with teeth at the bottom of the slot,
form distribution of coal over the {entire hearth of 70 andsaid crank ,pin having'a T-head with teeth
interacting with the teeth of said crank head to
the fire box to an even thickness to produce, most
be adjustable radially to vary the stroke of said
efficient combustion; both as to time of feeding
‘ and intensity of heat. The wide ‘range of ad
ratchet, actuating lever, and a prime mover for
~ Justment of the__feed mechanism adapts the in-_
rotating said crank head.
vention to the use of steam boilersof all isizes 7s
3. In. a stoker feed mechanism, a conveyor. for
5“ .
feeding solid fuel having fueiimpelling faces .in
angularly and axially spaced relation which when
' rotated feeds ‘relatively small unit increments of ,
Tpawl-to‘angular movlementjnand a crank shaft
being adjustable to vary the arc of movement ‘of
fuel to a fuel receiving station, a drive shaft for
the pawl actuating lever, and a prime mover in- .
said conveyor having a friction drive mounted on
‘eluding, avariable speed transmission for said‘
‘ one end thereof,‘ a ratchet wheel for actuating
crankshaft, whereby the volume ~of fuel delivered
by’ said feed wheel per unit of time may be varied
while maintaining constant the unit quantity de
said drive. a pawl for ‘said ratchet wheel and a
lever for-actuating said 'pawl, one end of the le
ver being pivotedkto a crank pin, and a drive
shaft having a crank ‘head'for mounting said pin,
'livered by'each blade -in its fuel feeding function.
the said friction drive being adapted to normally
feeding solid fuel having ‘fuel impelling faces
1 advance the feed" wheel for feeding fuel and to
which when rotated deliver a unit increment of
fuel successively to different areas of a feeding
permit continuing rotation of the drive‘ mecha—'
nism if the feed wheei’is obstructed against ro
4. ma stoker mechanism for feeding solid
‘ fuel to a ?re box, a°feed wheel having a‘ plural‘
. 5. In a stoker ‘feed mechanism, a conveyor for
station, said conveyor being mounted on a shaft
having ‘its axis'dlsposod in a horizontal plane.
a friction drive for said shaft comprising a pin‘
rality of conical disks mounted for rotation with
ity of mulariy and axially spaced blades which” ~ said shaft, a drive member having complementary
when rotated successively feed a measured unit
the conical surfaces of said disk
increment of fuel from one enduo'f the feed wheel ‘a - and having ratchet teeth thereon, a ratchet pawl ' '
entirely across to the other end of said wheel,
drive mechanism‘ including a shaft for said wheel;
for ensuing said teeth, and a crankvarm for sub
' iettlne 881d pawl to oscillatory movement to in- 1 '
termittentiy advance said friction drive disk to
the fuel conveyor .to intermittent rotary
wheel mounted on said conical members. in 'fric- gs movement.
a friction drive on the end of the shaft com
' prising a plurality of'conical membera-a ratchetv
tional engagement therewith, a pawl engaging the
teeth of said ratchet, a lever for subjecting the ' i
_ subiect
ensues a. name.
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