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Патент USA US2136594

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Nov. 1‘5, 1938.
F". T. NlcHò-LSON
Filed April 3. 1937
2 Sheets-Sheet 1
Nov. l5, 1938.
Fßr. NlcHoLsoN `
Filed April s, 1937
2 sheets-snaai z
` P
` "
` Patented Nov. 15,
„Y e ¿
¿ `
¿omeosm'rss PATENTomos
,h ` t gppiiostiî:
"I‘he, present invention lrelates to stokers ;for_
the expanding` passage of the throat‘or connec~ ‘
feeding the
coal means
into` furnaces,
for;` supplying
and ` tion.
¿Other features`
, ` ,
l >of ` the `invention
` "
‘ `appeal“
j` e
the coal ‘to the Stoker.
t ,
- o ,1,
, '
inthe appendedßrawingsand the followingj’de
Asi commonly constructed, these „stokers >are
arranged with a plurality or series of coal feeding units to `which the 4coal is supplied `from a
scription'wherein are shown and describeda pre-` 5
ferred `form of‘the present invention as applied
to an underfeed mechanical ,Stoker of a ‘well
‘ single common sourceysu‘ch as at‘bin‘or hopper, Í known type#
c'onnections‘ibeing` providedßirom the bottom fof;
i ,
, Y
.,‘In‘theaeeòmpß?yinë drawings Fig. 1 1S 8i Vel'
\ 10 the hopper to eachistoker unit. Commonly `these
tical ‘side sectional "view taken on line I-‘e-I of 10
i ‘
F1352 of onlythose portions o; „such a` stoker
binsï‘cr» hoppers` are provided with downwardly
converging‘side and bottom malls, and ‘the‘conf `1,115,tl’JlfttiOnlaster@ dœm'edneßèSSa?y 101" @n°1111
nections or “throats’t’ also have converging walls
e which forms‘contraoting passage ionthe cosi;
*15 ‘ 11n“ such` constructions difhcuity isl oftenr ext
derstanding of the Present" irivfëntíQIlÍâ, FIEQQZ iS
a front view“ 'of the `same.‘partly in elevation
and partly in Seotioa:` F1a:-` âie a top‘view, partly 15
` ` perienced in n securingw anunlnterrupted move-
e iniseetiompenlíne 31--3` 0f Fig.` ZLEÍE- 4 1S ali/'ere ‘
ment or now ofthe coal through such acon; l tioalaide Seotionaiview, onanenlarsed seale.ïof
trsoting throat, `due tothetemitmcy‘of` the cosi
the upper ,portion ofthe öonneetion lor throat,
to pack and arch over under the weight` of the
“ zo coeiandthe wedging action offithe'taperingside
‘ ‘ wallswwhllestoppageof thecoal supply occurs
showing` the i agitatorifor ,i the coal; Elgs. 5, 6 `
yand '7, are atop plan, a front, and a s1de'e1e« 2o
vatiori, „respeotivelvtof the -new and improved “
evenowhen the coal is dry, itis much more like" 1y where the coal is wetor damp;` and since it is
i a 'common practiceito construct these coal sup-
throat member separate and"detachedefro1n the
Dtlîiernpartäi Fig. 8 is a side `elevatioiri ‘of ‘a modi
25 ply bins or hoppers in theopen with no roof
verse sectionalview, on an enlarged scale, of one 25
or other sheitenthe cociis exposed toiirsin and
snow. I
provide: «a construction in „which such stopping
3o 'in the- movement .of the -ooai from `the «hopper
' to the stoker will be avoided andra continuous,
uninterrupted supplyvoiï` coal »to each Stoker unit
willbe insuredp‘
drawings; comprises bfiïèñyi‘ßï Series 0f Stoker
units extending across the front of the furnace,
each unith’avias a cylinder with a ram therein 3o
and a common aetuatine'shaftfoi‘ reciprocating
thE_„Tam t0 feed the ßÓal 111mm@ furnaces! An ‘
elevated binor hopper extending across the‘front
«To» the above Vends the‘present invention con35 templates the provision of a connection `or throat
0f the fill'llafœ» With` Si Connection 0f ,thl‘ûat from
the bottom 0f the hOPPeI‘ t0 B_aßh ram Wunder» 35
‘ ` `betiiveen the hopper or `other source of supply‘and
Supplies the C031 'thereto'
the Stoker units inwhich an ‘expanding passage
of the coalby the wedging' action' of the walls -a'ndfvîe
will, be, i prevented"
i y
, e
vision of a connection 0r threat membef‘of the
P‘bQVe ‘WDG which ‘is ‘adapted t9 be posmoœd
` or inserted `in the converging throats oi'_ installa-
tions` already Constructed and »thereby eliminate
liability of interference in theifuturewith the
50 l i Still another featureof; the present invention
i e
‘trêei drawntglî `Whi‘m mi: ,01d
@ma ,n „hg Bfr
dçse‘ lclqmpr e a'
ty’ m" sie» .e-S of @In cy m ers ‘mounted ‘40i
each opposite an opening I3 in the furnace wall
{5,1 Eachgcylinderis formed with an opening ,
@other Émilie oiflth‘? invention 1S ith? W0'
regular supply of coal tothe stoken
" ¿ e e
.Refçrrii‘ng‘ ñÈs‘t- t9, thQse 9011510115 0f the È’On'
` forthe‘ coal‘is> provided so thatl the compacting structml‘l
of; the eross-i?iemiqers‘ of thexeoal agitator;
The stoker,"which isi‘shown only inpart inthe
‘l iti isv the object` ofthe present invention to
ñed 10mi Qf the Saillie Dart; aIi‘dFìg? 91Sa UMIS
i1 ¿in Aits top won odjocen‘t‘the furnace, Vthe side
nousitheine„extenties` upwardly on@ overging
as shown in F‘ig.` 2f. ÁThe coal‘is supplied tothe 45
cylinder through ¿he Opening |V1-‘and then fed
by the reciprooatious “for the `rain (not‘shownp,
through the passageylg‘intq the furnace; Aram
` shaft „I9 _mounted across the `front ofthe-cylin
ders is `rotated slowly from `a `suitable source of <50
is «theprovision of Ya `stirring >,device or agitator
power to impaift‘the Ieedingand return strokes i ‘
`adjacentçtheupper or entrance end ci the coal
fto the rants of the several‘unitsmf- suitable con
`passage in the connection or throat, with súit-
Anections ffamiliar _tof‘ythïos‘e `sl‘l‘llle‘d l in ‘the `art,
*able actuating mechanism fto facilitate and` ln‘- „whichit is not necessaryhere‘ to describe. ` *‘ e
Í ‘55 sure the ¿passage of e. coal from thesupplyinto i: , 'IA'he‘ço‘al `for the yseveral units of"`the`stcker is `cui
supplied from a hopper or bin 2| having the
downwardly converging front and rear walls Il
and Il and extending across the face of the fur
nace above the stoker units. In these prior con
structions the connections or throats and the
wall to receive a closure or gate Il to close the
opening 55. This gate or closure comes opposite
the old closure 35 on the original throat construc
tion so thatif for any reason it is desired to gain
access to the interior of the ram cylinder or to
the ram therein, this can be done by removing
asubstantially verticalbackwall Il and down-y first the outer closure in the old throat and then
wardly inclined and converging front and side the inner closure on the supplementary throat.
Preferably the new and improved supplemen
walls Il and Il, respectively. all four walls nt
tingintotheopeningi‘l in the topofthe ram tary throat or connection willbe cast in one piece.
cylinder.asshowninl‘iga 1and‘2.
While all the intermediate throat members will
'llo provide access to the interior of the conn
ward movement should be prevented by arching
15 orforanyotherreason, an opening Il wasformed
near the bottom of the front wail Il for a slide
be identical, separate and slightly different cast
ings would be required for the end sections where
one side wall of the old throat was straight, as
shown in Fig. 2.y For such locations the margin
at the top would be of reduced width on one side
or closure 8l removably held in place rbythe lips“v
or the other, as required.
or ears I1 on the wall. When the coal became
arching of the. coal, the connection member de
scribed above has been provided. in accordance
`While the three-wall construction shown in
Figs. 5 to 'I has been found most satisfactory in
actual use, the fourth or back wall qi’ the coal
passage being formed by the straight back wall
of the old throat, it may be preferred in some
locations to use a throat member having four
walls completely enclosing the coal passage, with
all of the walls divergi'ng. Such construction is 25
with the present invention, with an expanding
shown‘in Fig. 8.
throat or passage so that all compacting and
To insure the continuous flow of coal from the
hopper into the upper end of the coal passage in
the new throat construction, there has been pro
vided a stirrer or agitator for the coal immedi
ately above the entrance opening, the agitator
being actuated from some convenient source of
power.' preferably the ram shaft. A convenient
form of agitator is illustrated in Figs. l to 4 of
the drawings, and comprises an elongated grid or 86
ladder-like Vconstruction which rests upon the
aligned tops of the throat members and is slowly
packed or arched over and ceased to flow. the slide
would be removed and a poker or suitable imple
ment used to free and loosen the coal.
l Inorder to eliminate this contracting passage
orthroat with its liability to cause packing and
wedging of the coal at this point is prevented;
This is accomplished. in the _embodiment illus#
trated in the drawing. by theprovision of an addi
tional or supplementary throat'__member adapted
to be positioned ln the old converging throat. and
provided with an expanding passage for the coal.
None of the old parts'already installed have to
bedisturbed, the new'throat member being of
such a. size and shape asl to fit within' the old
throat andbe retained in> positionvby its own
weight> and the weight of the coal above without
requiring the use of bolts or lother fastening
The preferred e form of throat member con
structed in accordance with the present inven
tion is shown detached in Figs. 5, 6 and '7, and
installed in position in Figs.) to 4. It comprises a
rectangular flat top 4l of a slze'tojflt within the
entrance opening of the old‘throat, with marginal
portions of the top resting uponthe curved con
necting tops 4I ofthe old side walls of adjacent
throats, (see Fig. 2) .' 'I‘he top of the new throat
member is provided with an opening or recess Il
, of rectangular connguratlon extending inwardly
from the rear edge ofthe top. 4Extending down
wardly from the ‘bottom face of the top at the
edges of the opening.“ are the front wall I1 and
the side walls 0, each of which diverges out
wardly from the vertical center line of the open
ing. so that a three-sided expanding passage is
formed having a greater cross-sectional area at
its bottom than st_,the top. Triangular supports
or webs Il mutually reinforce and strengthen the
_ top and side walls.
The bottom margins ofthe side walls are bev
elled slightly, as shown at vI3, to avoid contact
with the lowerends ofthe 'side walls of the old
throat and with the upper portions of the expand
ing side walls of the cylinder, which might inter
fere withthe proper seating of the top Il on the
tops of the old throat walls; vThe front wall of
the supplementary throat is vprovided at its bot
tom with the opening or recess Il, the inner lower
corners. of thewall being bevelled, as at I'L'to
reciprocated longitudinally during the operation
of the stolzer.
' As shown in Fig. 3, the agitator-comprises the
elongated side members 05 and 61 extending the
width of the hopper and connected by the spaced
transverse or cross-members 69.
A convenient
form of assembly is by welding the cross-members
to the side members which are arranged as best
shown in Fig. 4, with the front member posi
tioned flatwise and the rear member edgewise.
Shorter intermediate transverse members 1|
which extend only part way across from the front
side member toward the rear member are welded
to the front member only. Preferable the trans
verse members are of segmental form in cross
section, as shown on an enlarged scale in Fig. 9,
the bottom face being fiat and the top face arcu
ately convex.
The agitator is reciprocated in the illustrated
embodiment ofthe invention from the continu
ously rotating ram shaft I9 by the crank 13
mounted on the end thereof, as shown in Fig. 3.
The rotary movement of the crank is trans
ferred into reciprocatory motion of the agitator
by means of a vertical shaft 18 mounted to oscil
late in suitable bearing support 11. Fixed to
its lower end is the arm 19 connected by the link
or pitman 8| to the crank 13, while at its upper
end ls secured the arm 83 connected by link 8B
to the agitator. 'I'hus as the ram shaft rotates,
the agitator is reclprocated back and forth over
the top surfaces of the throat members', stirring
and loosening the adjacent coal so that a con 70
tinuous movement oi' the loose coal into the en
trance end of the passage in the throat members
avoid contact _with the ram when the latter is
reciprocated in_ithej cylinder. On‘each side‘oi'
is insured.
the recess Il are positioned lips or ears Il which
are undercut on their inner faces adiacent the
The convex upper surface of the transverse
members tends to maintain the agitator in posi
tionfupon the top surface of the throat members,
irrespectiveof ` `the direction of movement, but
to the stoker, the passage being of greater cross
secticnal area at its discharge end thanat its
to` avoid any possibilityV of the‘rear member‘of inlet end and the discharge end of the member
the agitator rising, thehold-down guides l! have `fitting within the discharge end of said throat. ‘
`been provided, `(see Figs; 2 and 4),`which are i 4. A throat" member adapted to be positioned
welded in position `to the back wail at‘the top within the downwardly converging walls of the
of the old‘ïthroats or‘connections.
" The extent of movement oi’l the ‘agitator is
preferably such that the cross-members'` l! will
10. traverse substantially the entire distance between
adjacent throat openingabut not pass over any
part of the openings themselves, while the shorter
intermediate members 1i will traverse substan
tially that portion of the top surface of the throat
15 members lying to the front of the opening. Thus,
‘ on each cycle-of operation or double stroke of the
agitator, substantially the entire fiat iop surface
of eachv throat member will be traversed,` but at
no time will the entrance to the passage in the
throat member be obstructed or covered by any
part of the agitator.
In the operation of the stoker illustrated in
the drawings, the coal feeds downwardly in a
fuel supply means of a Stoker,` said member com
prising a substantially fiat top with an opening
therethrough, walls extending downwardlyfrom
the top at `the opening and diverging to form an
expanding passage for the coal, said diverging
` walls of the throat member terminating adjacent
the termination of the walls of the fuelA supply
5. A throat member adapted to be positioned
within the downwardly converging walls of the
fuel supply means of a stoker, said member com
prising a substantially flat top with an opening
therethrough at one edge, walls extending down
wardly from the top at the edges of the opening 20
and diverging to form with one oi' the walls of
the fuel Isupply means an expanding passage for
the coal.
continuous, slowly moving stream from the hop~
6. A throat member adapted to be positioned
per or bin through the expanding passages of the
throat members into the ram cylinders. As the
ram shaft rotates slowly, increments of coal are
`in the fuel supplying means for a Stoker, said 25
member comprising a fiat top having a rectangu~
fed successively from the cylinders into the fm'
nace by the reciprocations of the rams. At the
same time, the agitator is moved back and forth
adjacent the entrances to the passages of the
throat members, maintaining the coal in loose
and free condition irrespective of whether it is
wet or dry, or what the height or weight of the
coal may be in the hopper.
While the present invention has been shown
and described as embodied in a construction
wherein a separate and detached throat member
is first formed and then positioned within the
40 old connection or throat of an installation, the
invention in its broader aspects is not to be lim
itedthereto, as it contemplates the provision in
the coal supplying means `for a stoker of connec
tions having expanding passages for delivering
coal to the stoker whereby packing and arching
over ofthe coal with resultant interruption in
its movement will be avoided.
Nor is the present ‘invention limited to the spe
cific form and arrangement of the `various parts
50 as herein illustrated and described, as these may
be varied as the occasion `and conditions require
within the scope of the language of the appended
\ Having thus described the invention, what is
claimed is:
1. The combination with a hopper for supply
ing coal to a stoker or the like, connections be
tween the hopper and the stoker having converg»v
ing, downwardly extending passages, and supple
60 mentary devices positioned in said passages, said
devicesfeach having a downwardly expanding coal
conveying-passage to facilitate the movement of
coal from `the hopper to the Stoker.
2*. A throat member adapted to be positioned
65 in the downwardly converging throat of a stoker
coal supply, said member comprising a top with
an opening therethrough and a plurality of di
verging, downwardly extending walls forming an
expending passage for the coal with a discharge
70 opening not materially less in cross-sectional area
than said throat.
3. A throat member adapted to be positioned in
the downwardly converging throat of fuel supply
means of a stoker, said member having a lpassage
lar opening therein of substantially less area than
the top, side walls extending downwardly from
the top adjacent the opening to form an ex-`
panding downward passage, one of said walls be
ing provided with an opening in the lower por
tion thereof, and a removable closure therefor.
` 7. A hopper for supplying coal to a plurality of
_stoker units or the like, said hopper having a
substantially flat bottom with a plurality of
spaced openings therethrough, connections from
the openings having downwardly expanding pas
sages for the delivery of coal from the hopper
to the stoker units, an agitator in the hopper
comprising a plurality of longitudinal members,
coal agitating cross-members adjacent the flat
`bottom of the hopper and spacedfrom one an
other between the openings, and means adapted
to be driven from the Stoker for actuating the
agitator to cause the cross-members to recipro
Acate between the openings, leaving said openings
free and unobstructed at all times.
‘ 8. A hopper for supplying coal to a plurality of .
stoker units or the like, said hopper having a
substantially fiat bottom with a plurality of
spaced openings therethrough, connections from
the openings having downwardly expanding pas
sages for the delivery of coal from the hopper
to the stoker units, an agitator in the hopper
comprising longitudinal members on opposite 55
sides of the hopper and adjacent the bottom
thereof, coal agitating cross-members connected
at their ends to said longitudinal members
and spaced from one another between the open
ings, shorter agitating members intermediate the 60
cross-members connected to one of said longi
tudinal members and terminating short of the
openings, and means for actuating the agitator
to move the cross-members between the open
. 9. The combination with a stoker for feeding
coal to a furnace comprising a ram cylinder with
a coal receiving opening in the upper wall there
of and diverging side walls extending upwardly
from said opening, of a hopper having down
wardly converging side walls connecting with
said cylinder walls, and a throat member posi
tioned between said hopper walls with a top ex
tending across the hopper and with an opening
75 therethrough for delivering coal from said means` through the top, and side walls surrounding the
downwardly to form a discharge throat, of a
opening and extending downwardly and diverg
ing and fitting within the said cylinder walls to supplementary throat member positioned in the
throat of the hopper, said member having a top
forma diverging discharge passage having a dis
charge-opening at its lower end not'substantially
extending across the throat oi' the hopper, an
less in the cross-sectional area than the cross
inlet opening through the top, and downwardly
diverging side walls terminating in a,_discharge
opening positioned within and approximately of
sectional area of the hopper adjacent the cyl
inder walls.
l0. The combination with a hopper for tuel
and the like having a bottom discharge opening
the same cross-sectional area as the throat oi
and side walls adjacent the opening converging
the hopper.
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