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Патент USA US3022931

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Feb. 27, 1962
W. G. DAVENPORT ETAL
3,022,921
DISCHARGE GATE APPARATUS
Filed May 26, 1960
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INVENTOR.
WILLIAM G. DAVENPORT
34
B
ROBERT K. HAMPTON
Y ALAN M. KATZEN
ATTORNEY
Feb. 27, 1962
w. G. DAVENPORT ETAL
’
3,022,921
DISCHARGE GATE APPARATUS
Filed May 26, 1960
3|
28
2 Sheets-Sheet 2
.3
Fig. 5
INVENTOR.
WILLIAM G. DAVENPORT
ROBERT K. HAMPTON
ALAN M. KATZEN
ZY/ gig
ATTORN_EY
‘ rates
atent
nice
3,022,921
Patented Feb. 27, 1962
1
2
3,022,921
for handling drain water by structural changes to the gate
which do not necessitate changes to other parts of the ap
DISCHARGE GATE APPARATUS
William G. Davenport, Jenkintown, Pa., Robert K.
Hampton, Garden City, N.Y., and Alan M. Katzen,
Philadelphia, Pa, assignors to Beaumont Birch Com
pany, Philadelphia, Pa., a corporation of Pennsylvania
Filed May 26, 1960, Ser. No. 31,851
12 Claims. (61. 222-408)
paratus.
Still another object of the present invention is to pro
vide novel drained gate apparatus capable of handling very
large quantities of drain water by employing a construc
tion which utilizes the principle of gravitic ?ow.
The foregoing and other objects of the invention will be
come apparent from a reading of the following speci?ca
This invention relates generally to drained gates for con 10 tion in conjunction with an examination of the appended
trolling the delivery of bunkered material to any suitable
drawings, wherein:
receiving apparatus. Commonly gates of the type to be
FIGURE 1 is a side elevational view of the drained gate
described are installed below bunkers which hold material
according to the invention installed upon an ash bunker
containing a substantial amount of water, as for ex
to close the discharge chute thereof;
ample, coal bunkers wherein the stored coal also con 15
FIGURE 2 is a top plan view of the drained gate ac
tains coal wash water, and hot ash storing bunkers wherein
cording to the invention as would be seen when viewed
the ash contained therein has been quenched and, there
fore, also contains a substantial amount of water.
For
purposes of illustration, the present invention hereinafter
from above with the overlying bunker removed, but with
the bunker chute remaining;
FIGURE 3 is a transverse sectional view through the
described is illustrated in the drawings as embodied in an 20 drained gate according to the invention as would be seen
ash gate.
In order to adequately quench the hot ash deposited in
the bunker, immediately below which the gate according to
when viewed along the lines 3—3 of FIGURE 2;
FIGURE 4 is a longitudinal sectional view through the
drained gate according to the invention as would be seen
the invention is located, substantial amounts of water are
when viewed along the lines 4-4 of FIGURE 2;
employed and the gate drainage apparatus must be capa 25
FIGURE 5 is an enlarged fragmentary view, in section,
ble of carrying o?i this water without spillover or over?ow
of that portion of the apparatus within the phantom cir
onto the floor underlying the gate. In some applications,
cle on FIGURE 3.
the volume of quench water required to be drained may
In the several ?gures, like elements are denoted by like
readily exceed ?fty gallons per minute and presently known
reference characters.
drained gate structures are generally unable to handle such 30
Turning now to the drawings and considering ?rst the
a water volume. Moreover, when the stand of bunkered
views of FIGURES 1 and 2, there will be seen a storage
bunker 1-0 whose inside walls are lined with a refractory
of water may exist in the bunker. Since the bunker clos
material 11, such as ?re brick, and which has af?xed to the
ing gate is generally spaced fairly closely below the bot
bottom opening thereof a bunker chute 12 extending verti
tom of the bunker discharge chute, as for example ap 35 cally downward therefrom and having an open bottom
proximately one-eighth of an inch below, it will be ap
adapted to be opened or closed by the shiftable gate 22.
preciated that bunkered water under any appreciable head
The bunker chute 12 is provided with the vertically ex
will be discharged laterally outward through the small
tending front wall 13, rear wall 14 and pair of opposite
clearance between the chute bottom and the top of the
side walls 15. Formed integrally with the chute 12 at the
gate at a relatively high velocity. With gates of the usual 40 top thereof is a peripherally extending top mounting
type having upward and outwardly sloped side walls, the
?ange 16 apertured with the bolting holes 17 and by means
drain water ?owing laterally outward across the top of
of which the chute 12 may be bolted to the bottom of the
the gate bottom at high velocity can ?ow right up the
bunker 10. As best seen in the view of FIGURE 4, the
side walls and over the sides of the gate and thereby fall
outer surfaces of the front and rear chute walls are pro
material is of any substantial height, a considerable head
to the ?oor below.
Since this condition arises as a con
vided with substantially horizontally extending reinforc
sequence of the velocity of the flowing drain water, it 45 ing ?anges designated as 18 on the rear wall 14 and
may occur even in those cases where the gate would other
wise normally be able to handle the volume of drain
designated as 19 on the front wall 13.
As best seen in FIGURES 3 and 4, integrally formed
water.
with or subsequently secured to the chute side walls 15
Thus, the instant invention contemplates the solution of
on the outer surfaces thereof and extending at an inclina
two problems, namely the provision of a drained gate with 50 tion to the horizontal are a pair of side wall mounted
means for draining large volumes of water from the
inclined tracks 20. The tracks Zil, along which the gate
bunkered material above the gate, and also the provision
22 is shiftable in a manner to be subsequently described,
of means for preventing high velocity drain water from
extend ‘from a point to the right of the chute rear wall
escaping the drainage system. While it may at ?rst be
14 over toward the left on a downward inclination along
55
considered that the two problems solved by the present
the chute side walls 15 to a point just short of the chute
invention are essentially independent ones, this is not in
front wall 13, then turning upward through the short up
actuality the case and the means for overcoming the vol
turned section 21 and terminating at the front Wall rein
ume drainage requirements problem also contributes to
forcing ?ange 19. The short up-turned track section 21
the solution of the velocity problem. Accordingly, it is a
proximate the chute front wall 13 acts as a stop to the for
primary object of this invention to provide a novel drained 60 ward motion of the gate 22 by preventing the gate carry
gate apparatus wherein means are provided for substan
ing rollers 33 from further rotation in the direction of the
tially increasing the ability of the gate to handle large
chute front wall.
quantities of drain water and to simultaneously prevent
As best seen in the showings of FIGURES 3 and 5, the
the escape of the drain water from the drainage system.
bunker
chute closing gate 22 is generally of U-shape in
Another object of this invention is to provide novel 65 cross section, the bottom region of the U being of some—
drained gate apparatus which includes means for con?ning
what modi?ed construction. The lower region of the
high velocity drain water to the drainage system and pre
gate 22 is seen to be formed of a horizontally extending
venting spillover or spraying thereof out of the drainage
bottom
portion 23 having a pair of up-turned side edges
system.
24 which together form a trough lined with a refractory
70
Yet another object of this invention is to provide novel
material 25. Extending laterally outward from each of
- drained gate apparatus of substantially increased capacity
the up-turned edges 24 is an outwardly turned generally
3,022,92 1
3
horizontally extending portion 26 which each themselves
turn vertically upward generally parallel to the chute
side walls 15 and terminate in horizontally extending
?ange portions 28 extending in opposite direction from
the up-turned portions 27, so that each ?ange 28 extends
inward toward the chute side walls and outward there
from. The inward projecting portions of the ?anges 28
are observed to closely non-engagingly underlie the tracks
20 mounted on the outside of the chute side walls 15, and
4
vertical portions 26 and 27 are absent and there exists
generally in their place a diagonally upward sloping side
wall portion which bridges between the tops of the up
turned edges 24 and the horizontal ?anges 28, the inward
extending projections of the ?anges 28 also being absent.
The drainage area thus provided is of generally triangular
cross‘section lying between the diagonally upward slop
ing portion just mentioned and the outside surface of the
lower edge of the bunker chute.
The smaller area of
also to form with the below-lying gate vertical portions 10 the drain channel cross section in the usual case, there
fore, restricts the volume of water that can pass into the
27 and horizontal portions 26 a pair of side drainage
drain box at any given instant of time and frequently
channels 29. This same ‘drainage channel structure is
results in the bunker drain water over?owing the sides
also formed at the back end of the gate 22, as best seen
of the gate.
in the showing of FIGURE 4, so that the drain channel
The change in con?guration of the gate bottom cross
29 is continuous around the sides and rear of the gate 22. 15
section in the channel region signi?cantly increases the
The front end of the gate 22, which is observed in FIG
drain channel cross-sectional area and hence permits
URES l and 4 as projecting into the drain box 38, is
larger volume discharges from these channels into the
not provided with the drain channel forming vertical por
drain box thereby reducing and generally eliminating any
tions 27 or horizontal ?ange 28, but is instead provided
with a drip ledge 30 so that the water draining from 20 tendency toward an over?ow condition. Additionally,
the inclination of the tracks 20 upon which the gate rollers
the bunker may ?ow through the drain channels 29 and
33 are'disposed, causes the entire gate 22 to be inclined
along the top surface of the gate 22 toward the drain
toward the drain‘ box 38 so that water draining from the
box 38 and be‘discharged thereinto over the drip ledge
bunker is accelerated toward the drain box 38 and does
30.
not tend to pile up in the side and end drainage channels
29. The inclination of the gate 22 in this fashion dictates
that the bunker chute front wall 13 be of somewhat
greater vertical extent than the bunker chute rear wall
riding along the tracks 20 secured to the chute side walls
14 in order ‘to maintain substantially the same clearance
’ 15. Formed along the upper edge of each of the side
walls 31 are a plurality of teeth which form solid toothed 30 at all points between the chute bottom and the top surface
of the bottom portion of the underlying gate 22 so that
racks 32. Disposed above the racks 32 and in meshed
any'tendency toward Washing some of the bunker material
engagement therewith are the teeth of a pair of pinions
into the drain box'is minimized.
36 ?xedly mounted upon a rotatable shaft 34 journalled
Observation of FIGURES 3, 4 and 5 reveals the rela
in bearings 35 carried by the upper portions of the track
structures 20 located to the right of the chute rear wall 35 tively small clearance between the peripherally extending
bottom edge of the bunker chute 12 and the underlying
14. The pinion shaft 34, as best'seen in FIGURE 2, ex
outwardly turned horizontal portions 26 of the gate body
tends for a distance beyond the chute side walls onrone
bottom region. As earlier mentioned, this relatively small
side and has af?xed thereto a chain wheel 37 by means of
clearance causes the bunkered water to ?ow outward into
which the shaft 34 and pinions 36 may be rotated to cause
the channels 29 at a‘substantial velocity which in the case
the teeth of the pinions 36, which are intermeshed with
Extending vertically ‘upward from the side ?anges 28
are the gate 22 side walls 31, to the inner sides of which
are rotatably journalled the rollers 33 seated upon and
of the usually constructed gate would result in immediate
water spillover and spraying onto the ?oor below regard~
less of the water volume handling capabilities of the gate.
left to close the chute bottom, the entire gate 22 being
Such spillover and spraying cannot occur with the illus
shifted along the tracks‘ 20 by means of the rollers 33
45 trated gate construction because it will be appreciated
journalled‘in the gate side walls 31.
that this high velocity laterally ?owing water will be
Depending from and secured to the bunker chute front
turned up the channel 29 side walls 27 and then turned
wall reinforcing ?ange 19 by means of the bolts 40 is
inwardly against the lower outer surface of the chute
the enclosed drain box 38 having an outlet 39 at one
bottom by means of the inward projecting portions of the
end thereof and being provided with a side opening 41
into which the drip ledge 30 of the gate 22 projects when 50 horizontal ?anges 28. The high velocity drain water is
thus con?ned to the drainage channels 29 through which
the gate is closed. The drain box 38 is inclined, as best
it flows along the downwardly sloping channel bottoms 26
seen in the showing of FIGURE 3, so that the collected
toward and into the drain box 38. The tendency toward
water tends to ?ow by gravity out through the outlet 39,
splashing or spraying of water out of the channel 29 is
which in general will be coupled to a run-off system,
the solid toothed racks 32, to drive the entire gate 22
to the right in order to open the chute bottom or to the
such as a run-off gutter.
The lower edge of the drain 55 further reduced by causing the inwardly projecting por
box side opening 41 ‘which is normally disposed im
mediately below the gate drip ledge 38 is provided with
an inwardly somewhat down-turned ?ange 42 to prevent
relatively high velocity drain water running oif of the gate
drip ledge from flowing around the curved bottom of the
drain box 38 and upwardly out ‘through the side opening
41. Similarly, avsecond ?ange 42 is formed on the inside
of the drain box 38 extending substantially horizontally
and parallel to the side opening ?ange but being disposed
along the drain box wall remote from the gate 22. Under
standing now the basic structure of the apparatus, the
following discussion of the manner in which the apparatus
achieves the aforedescribed desired functions will be
tions of the horizontal ?anges 28 to relatively closely
underlie the bottoms of the tracks 20 and the bottom of
the chute rear wall reinforcing ?ange 18 to thereby pro
vide a very narrow opening therebetween through which
60 the spray ?nds it‘extremely di?icult to pass.
It will, of course, be realized that the particular cross
sectional shape of the closure gate 22, as for example
illustrated in FIGURE 3, is not necessarily limited to
that illustrated but may be modi?ed for di?erent purposes
while still incorporating therein the advantages of the
aforedescribed invention. By way of illustration, it will
be appreciated that a gate designed to close the bottom
of a coal bunker need not be formed with the bottom
channel structure including the bot-tom horizontal por
The increased water volume handling capacity of the 70 tion 23 and up-turned side ?anges 24 since in the illus
trated case the trough sov formed is utilized to accom
gate‘ 22 is brought about by two means. First, the rear
modate the refractory lining material 25 to adequately
end and side drain channels 29 are of signi?cantly en
withstand the heat of the still hot bunkered ash mate
larged cross-sectional area, and are of a different cross
rial. Elimination of this channel is readily achieved by
sectional shape than is usually employed in under-bunker
"gatesof this'type. ' ‘In the usual gateythe horizontal ‘and 75 merely'eliminating the side portions 24 and forming the
readily understood.
3,022,921
5
gate bottom 23 as a continuous extension of the hori
zontally outward turned portions 26.
Similarly, the
cross-sectional area of the drain channel 29‘ may be
6
a distance and terminating in a surface portion in-turned
and projecting toward the outer surface of the chute
side walls, whereby high velocity drain water passing
materially further increased if desired by extending the
outward through said opening is de?ected by said surface
outward turned portions 26 to points underlying the side
extensions backward toward the outside surface of said
walls 31 and shifting the upward turned portions 27 out
chute and falls back down into said drainage channel,
ward substantially ?ush with the outer edge of the gate
said in-turned surface portion comprising at least a part
side walls 31. Moreover, the inclination of the tracks
of said means for preventing escape of drain water from
20 along which the gate 22v is shiftable may be more
said drainage channel.
or less than that illustrated in the,?gures depending upon 10
7. The apparatus according to claim 6 wherein said
the particular requirements of the given installation.
means for preventing escape of drain water from said
Having now described our invention in connection
drainage channel further includes ?ange-like elements
with a particularly illustrated embodiment thereof, it will
projecting laterally from the side walls of said chute
be understood that modi?cations and variations will occur
in closely spaced overlying relationship to the drainage
from time to time to those persons normally skilled in 15 channel in-turned portion which projects toward the outer
the art without departing from the essential scope or spirit
surface of said chute to thereby prevent water spray from
of the invention, and, accordingly, it is desired to claim
escaping out of the drainage channel through the open
the same broadly as well as speci?cally as indicated by
ing between the chute outer surface and the said in
the appended claims.
turned portion projecting theretowards.
What is claimed as new and useful is:
20
8. The apparatus according to claim 6 wherein the side
1. Under-bunker drained gate apparatus comprising in
walls of said chute carry a pair of parallel disposed tracks
combination, a chute projecting downward from the
inclined at an angle to the horizontal, and wherein said
bunker, a chute bottom closure gate shiftable between
gate carries a plurality of rollers seated upon said tracks
chute opening and chute closing positions, said gate hav
for movement therealong and for inclining said gate car
ing a bottom portion the top surface of which closely 25 ried drainage channel at an angle to- the horizontal in
underlies the lower peripheral edge of said chute in spaced
accordance with the angle of said tracks, the inclination
relation thereto when said gate is in chute closing posi
of said tracks being in such sense as to cause accelerated
tion to de?ne a peripherally extending opening therebe
tween, a drainage channel carried by said gate and com
municating adjacent to the bottom thereof with said
peripherally extending opening to thereby receive bunker
flow of drain water toward said discharge means.
9. The apparatus according to claim 7 wherein the
?ange-like elements projecting laterally from the side
walls of said chute comprise a pair of parallel disposed
held water passing outward through said opening, a drain
tracks inclined at an angle to the horizontal, and wherein
age channel discharge means for permitting the escape
said gate carries a plurality of rollers seated upon said
of drain water out of said drainage channel, and means
tracks for movement therealong and for inclining said
operatively associated with said drain channel to prevent 35 gate carried drainage channel at an angle to the hori
the drain water from escaping said drain channel except
zontal in accordance with the angle of said tracks, the
through said discharge means.
inclination of said tracks being in such sense as to cause
2. The apparatus according to claim 1 wherein said
accelerated ?ow of drain water toward said discharge
drainage channel discharge means comprises a drip ledge
at one end of said gate over which the drain water ?ows 40
means.
10. The apparatus according to claim 8 further includ
ing gate stop means operative to prevent further shifting
motion of said gate along said tracks when said gate
to permit penetration of said gate drip ledge thereinto
is in chute closing position.
when said gate is in chute closing position.
11. The apparatus according to claim 8 wherein the
3. The apparatus according to claim 2 wherein said 45 lowermost points of said inclined tracks are turned sharply
drain box at the lower edge of the drip ledge aperture
upward to provide roller stop means effective to prevent
is provided with an in-turned ?ange to» prevent drain
further shifting motion of said gate along said tracks
water from escaping through the aperture by de?ecting
when said gate is in chute closing position.
the same back into the drain box.
12. The apparatus according to claim 8 wherein said
4. The apparatus according to claim 1 wherein said 50 drainage channel discharge means comprises a drip ledge
drainage channel is inclined to accelerate the ?ow of drain
at one end of said gate over which the drain water ?ows
water toward said discharge means.
out of said drainage channel, and an enclosed drain box
5. The apparatus according to claim 1 wherein said
secured to said chute, said drain box being apertured
drainage channel extends about a substantial portion of
to permit penetration of said gate drip ledge thereinto
the gate bottom periphery and in communication with 55 when said gate is in chute closing position.
said opening, the remainder of the gate bottom periphery
References Cited in the ?le of this patent
comp-rising said drainage channel discharge means.
6. The apparatus according to claim 1 wherein said
UNITED STATES PATENTS
drainage channel comprises a lateral extension outward
1,360,805
Sherman et al _________ __ Nov. 30, 1920
6
O
beyond the chute side walls of said gate bottom top sur
1,561,761
Allen ________________ __ Nov. 17, 1925
face, said surface extension then being turned upward for
2,238,296
Stock _______________ __ Apr. 15, 1941
out of said drainage channel, and an enclosed drain box
secured to said chute, said drain box being apertured
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