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Патент USA US2411918

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DecQa, 1946.
Filed Sept. 5, 1944
6 Sheets-Sheet 2
Dec» 3, 1946-
' _2,411,918
Filled Sept. 5, 1944
f6 Sheets-Sheet 3'
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Patented Dec. 3, 1946
.- . _. .
Richard C. Wright, Bay Village, Ohio, assignor
to Iron Fireman Manufacturing Company,
Portland, Oreg.
Application September 5, 1944, Serial No. 552,720
7 Claims. (C1. 126-177)
The main object is to provide a grate of the
class described which will minimize the amount
grates even when the grates are in the dumpe
position, thereby eliminating the source of high
of riddlings passing downwardly through the
maintenance commonly experienced with other
grates by means of a special arrangement of air
ports, wherein each vertical port is located di
rectly under a horizontal rib which is consider
usual period of poor burning conditionsV encoun
ably Wider than the air port, thereby eliminating
any possibility of fine particles falling through
the air ports. Riddlings are .also prevented from
passing downwardly'through the grate sections
by special> seals between adjacent grate bars.The second object is to provide a grate of the
class described having improved air distribution
brought about by »having each air port disposed
horizontally against an opposing air stream,
thereby diffusing the air at the grate level and
greatly reducing the maximum localized velocity
Ipressure of the air leaving the grate in a vertical
direction. The distribution of air is further im
types of dumping grates, and also preventing the
tered with other` types of grates immediately
after being dumped bare.`
The fifth object is toY provide a grate of the
class described which is especially adapted for
use with a Stoker of the spreader type. Aspread
er type stoker which is adjusted to give proper
coal distribution under normal running condi
tions (grates covered with ash) will notgive uni
form distribution _on a bare grate. On a bare
f' grate the coal tends to accumulate at the rear
because of the tendency for the pieces of coal
to ricochet from the hard surface. Thismeans
that after the grate is raked or dumped. clean,
uniform coal distribution is slow to establish
proved by maintaining abit of loose ash between 20 itself; and until the 'grates' become sufûciently
covered to correct the coal distribution, the com
the ribs of the grate bars of sufficient depth to
bustion of the coal is poor.V -It is to overcome
provide uniform air diffusion, which is not a com
his diiliculty that the present type of grate has
mon characteristic of other types of grates. The
grate bars on the top of the grates hold sufficient
The'sixth object is to devise a grate of the
ash between to insure complete air diffusion at 25
' class described which would be simple to assemble,
all times, regardless of the'skill or care used by
install and adjust without the employment of
the operator in cleaning the iire.
special skill or tools. This is established by caus
The third object is to provide an improved
ing each grate bar to “float” on its bearing bar
form of seal between adjoining grate bars, these
seals effectively closing the clearances between 30 entirely independent of the other grate bars. i
The operation of leveling the bars is greatly sim
the grate bars at al1 times and in a very iiexible
manner. and form a means of justifying the
grate bars much in the manner in which type is
justified by varying the spaces between the ad
plified and if any bar is damaged, it can be re
placed by simply lifting it out and dropping the
replacement bars in place.
may be easily controlled, and at the same time
The seventh object is to construct a grate of
the class described in which the dumping grates
providing flexible means of actuating the grate
bars to repeated. expansions and contractions.
are constructed on steel bearing bars with re
placeable cast iron bearings at each end, thereby
grate is supported by the next grate in line. the
grate bars themselves being loose in their support
steel grate supporting bars.
The eighth object is to provide supporting
beams which are strong enough to support the
load and yet will protectthe supporting beam
jacent bars in order that the over-all dimension
affording the advantages of the cast iron bear
A tight seal is maintained at each end of a grate
bar by so arranging them that one end of each 40 ings and the greater strength of the structural
bars and so arranged that they are free to float
in any direction in order to seat themselves‘on
the end seal ledge of the next grate bar.
45 from becoming overheated as the air cooled bear
The fourth object is to provide a -grate of the
class described which will remain unusually cool
ing grates prevent the beams from coming into
contact with the radiant heat of the ñre, and
grate which is ever directly exposedto therflre is
The ninth object is to provide a grate support
assembly which becomes a rigid steel structure
due to this construction break up any downward
in operation due to the .high degree of area
ñow of conducted heat. ‘This construction also
exposed to the cooler air in the plenum chamber
lends itself readily to the use of partitions for
in comparison with the very small amount of area 50
of the plenum chamber. '
exposed to the fire. The, only portion of the
a very narrow strip on top- of each rib.
`which is entirely independent of the boiler' or ,
ribs are provided betweenl the main ribs to insure
furnace setting. -This arrangement eliminates
the retention 'of a protective layerA of' ash on the 55
distortion due to expansion or contraction of the
brick work.
The tenth object is to afford an easily replace
able form of skirt for the lateral marginal dump-`
23 which journal in the bushing I8. Foreign
substances are prevented from entering the bear
ing surfaces by means of the collar 24 on the
inner side of the bearing I 6, and the cover plate
ing grates to prevent pieces of clinker from get CII 25 on the outer side of the bearing IS. Of
ting underneath the dump grates and pinching
course, this applies only to the bearing nearer to
between the dump grate and the> bearing grate,
the outer wall` l2. The intermediate bearings 26
are duplicates of the bearings I6 but of course
which would make it diñicult to close the grates
when they are in the open position.
use two of the collars 24 as the trunnions 23
I accomplish these and other objects in a
extend into those bearings from both ends.
manner set forth in the following specification
Each dumping grate unit consists generally of a
as illustrated in thè accompanying drawings, in
fiat grate surface 33, which is somewhat rectan
gular in form and has formed on the top side
Fig. 1 is a fragmentary plan of the grates show
thereof the plurality of ribs 34 through the bases
ing the brick work cut away in the horizontal 15 of which are formed the horizontal slots 35 which
communicate through the downwardly extending
Fig. 2 is a fragmentary View showing a section
portion 36 with the under side of the grate sur
of the dumping grates in elevation and showing
face 33. Depending from the nat top 33 are the
the supporting structure in brick work in section
vertical sides 31 having a groove 38 formed along
taken along the line 2_2 in Fig. 3, but showing 20 the length thereof except at the extreme ends,
the dump grates level.
which are closed by the ribs 39. The lower side
Fig. 3 is a longitudinal vertical section taken
45 of each groove 33 is inclined as shown to re
along the line 3_3 in Fig. 2 and showing the
ceive the sealing rods 4I. The faces 4I! are op
front and rear grate bars in elevation.
posite and slope downwardly toward each other
Fig. 4 is a Vertical section through one of the
and the rods 4! simply settle down to a seat on
dump grates taken along the line 4_4 in Fig. 6.
the two faces 4Q. The rods 4I may be of any
Fig. 5 is an end elevation of one of the shaker
length but in practice are about one half an inch
grates taken along the line 5_5 in Fig. 6.
in diameter and six inches in length. At one end
Fig. 6 is a side elevation of one of the shaker
of the ribs 34 is disposed the transverse rib 42,
grates shown in Fig. 5. '
30 and along the length thereof one or more inter
, Fig. 7 is a fragmentary enlarged section taken
mediate ribs 43, the purpose of which is to pre
along the line 1_1 in Fig. 4.
vent all of the ashes from dumping, leaving a
blanket of ash over the dump grates when the
dump grates are returnedL to their horizontal or
Fig. 8 is a side elevation of one of the skids
used between each lateral dump grate and its
adjacent bearing grate. ,
Fig. 9 is a plan of Fig. 8.
Similar numerals refer to
throughout the several views.
o: Ul
burning position.
It is desirable to provide the notches 44 in the
ribs 42 and 43 and the ribs 34 are provided with
the notches 45 for expansion purposes. Extend
ing downwardly from the end of the grate sur
Bearing grate unit
40 face 33 just outside of the rib 42 is the inclined
Referring in detail to the drawings, there is
wall 43, which terminates in a horizontal ledge
41 which forms a support for the next adjacent
shown the front wall I0, the bridge wall II, and
grate member when in a` burning position.
side wall I2 of the furnace or boiler setting, into
which my grate bars are to be installed.
At the opposite end of the grate surface 33 is
Referring particularly to my invention, Same - formed the under cut face 48, which terminates
will be seen to consist of the bed rails I3 which
in the rounded shoulder 43 adapted to rest on
are preferably in the form of channels and
the ledge 41 of the next adjacent grate member.
spaced from each other to receive one complete
Extending downwardly from the grate surface
unit of dumping grates. On the top side of each
33 are the webs 50 which are united at inter
member I 3 is placed a plate I4, which acts as
mediate points by the transverse webs4 5l, which
a support for the side wall seals I5 and 3I which
are spaced far enough apart to receive the bar
close the space between the outside of the mem
2l, it being preferable to provide bosses 52 at
bers I3 and the side wall I2. Disposed along the
each corner of each web 5I for seating purposes
intermediate portions of the plates I4 are the
if desired. Projecting below the edge 53 is a
bearing grates I3, having an opening i1 formed
pivot pin 54 which is integral with the central
therein to receive the bushing I3, or other form
rib 55, which extends along the length of the
of bearing, which is held in place by means of
shaker grate section. The pin 54 occupies a cor
the pin I3 extending into the opening i1. The
responding hole. in the top of the bar 2|.
bearing grates i3 are held in place on the mem
It will be noted that the air passing upwardly
bers I3 by means of the bolts 2S.
through the ports 33 will be turned horizontally
The member i6 has an air passageway 21
along the surface 33 and meet the corresponding
formed therein which cools the bearing and af
air stream from the opposite port 35, setting up
fords a means of communication for air passing
a dispersing and diffusing action, which is con
from the under grate space 28 through the air
ducive to uniform combustion over the area of
ports ‘29 to the combustion. Air enters the mem
the fuel bed.
ber I3 through the side ports 3l). A refractory
Skirt for dumping grates
material 3l is filled in between the bearing grate
I6 and the wall I2 and its top surface 32 is pref
It is sometimes desirable to provide a skirt 53
erably inclined as shown.
whose upper edge 51 extends over the side of a
70 marginal grate as shown in Fig. 4, while its pro
Dumpingl grottey unit
jecting lug 58 is a counterpart of the shoulder 49
Each section of dumping grates consists of a
and its lug 59 is a counterpart of the ledge 41.
channel` shaped dumping grate bearing bar 2i
The member 55 is provided with a cut away por
within the ends of which are bolted the blocks
tion 60 to receive the channel 2l.
22, from the ends of which project the tï‘llnllîQllS
An angular
foot BI projects laterally from the member 53
and bears yagainst'th‘e si'de web 50 and holds the
member 56 in a vertical plane.
VA shoulder 62 is> formed on the same side of
the member 56 as is the foot 6|, and- is adapted
to engage -the under edge of the shaker grate 53
as shown in Fig. 4. "The purpose of the skirt 56
is to prevent pieces of >clinker from getting under
neath the dump grates and pinching between the
dump grates and the bearing grates, thereby mak
manner 'toîproduce a rocking'` motion at'the
88. -attention
n '
drawn ' to'
formed around the base of the pin 54, the pur-poseï
of which is -tov enable the relatively large dumping>
grate unit to float into a position of maximum air
seal, and also facilitating the assembly of the
It will be seen from the foregoing» that in ad
ing vitfdifdcult to close the dump grates after they 10 dition to the structural advantages 'above de-f
scribed, grates so constructed'are self-protecting
have been placed in an open position.
Rear bearing grate units
due to the layer of ash Ywhich must remain onlthe grates even after they are dumped, which con
dition not only _protects the grate members but
Mounted across the bed rails I3 near the bridge
Wall I I is a rear grate supporting rail 63 which is 15 also insures a more uniform diffusionA of air over
secured to the rails I3 by means of the bolts t4.Each rear'grate unit has a sloping surface 65
which terminates at its lower end in the hori
the entire surface anda better burning »conditionv
over the entire grate area. Special attention i's
drawn to the sealing rods 4I, each of which is
supported by the faces 48 of adjacent shaker grate
zontal section 66,~which is substantially level with
the ‘top of the bearing grate I6. The portions 20 sections, not only adapting the sections to 'each
other within the limits of the spacings" deter
65 and A66 are provided with air outlet ports 61'.
mined by the pins- 54 but also affording a sealfto
From the horizontal 'portion 66 the rear grate
prevent air from passing forwardly between the
slopes downwardly along Ithe faces 68, which is
sections or ashes from passing downwardlybe
substantially parallel with the face 69 of the
bearing grates I6 and spaced therefrom by means 25 tween the sections.
With further reference to Fig. 4 of the draw#
ofthe horizontal lug 10, the space between the
ings, it will be noted that the air passing upward
faces 68 and 69 and above the lug 1I) being filled
vly through the ports 36 impinges against the top
with refractory or ash, Whereas those portions of
of the slots 35, .carrying the heat away from the
the rear grates in alignment with the shaker
grates employ the lugs 19 as stops for the shoulder 30 only portion of the grates in direct contact with
the burning fuel and then passing laterally along
49 thereof. Side wings 1I extend downwardly
the surface 33 until it meets a corresponding
along the front of the rail 63 while the lugs 12
stream from the opposite port 35, producing a
engage the upper portion of the rear side of the
diffusing action.
rail 63. An asbestos strip 13 is placed above the
While I have thus illustrated and described my
lug 12 between the rear grate units and .the 35
invention, it is not my intention to be limited to
bridge wall II. The space above the strip 13 is
this precise form, but intend that it shall cover
ñlled with a refractory 14.
Front grate um'ts
Secured across the rails I3 by means of the 40
bolts 15 is the supporting rail 16, which carries
the front rail units, each of which is provided
with the horizontal top surface 11 and the longi
tudinal ribs 18 on the upper side thereof, which
ribs correspond with the ribs 34 on the shaker
grate and are Preferably in alignment therewith.
The forked side ribs 19 straddle the rail 16 and
all such forms and modifications thereof as fall
fairly within the appended claims.
I claim:
l. A grate of the class described Icharacterized
by having its surface broken longitudinally and
laterally into a plurality of grate sections and
‘characterized by having each of said sections in
dependently `and pivotally mounted, and self-ad
justing rods for sealing the clearance spaces be- _
.contain in the sides thereof grooves 80 for Ithe
reception of a sealing packing. A similar groove
tween said sections,
2. I_n a grate of the class described, a com
bination o-f a transverse grate supporting bar for
is employed in the wings 1I of the rear grates and r
for the same purpose. ’I‘he front edge of the
having means for rocking same, together with a
front grate is provided with a channel sha-ped lug
8| upon which rests the strip 82 of asbestos, upon
which is placed the filler 83 of refractory material,
per side of said bar, each of said sections being
which extends to the front wall I0. The purpose i
a furnace, supported at opposite ends thereof and
plurality of gratevsections disposed along the up
characterized by having an inverted U-shaped slot
formed under same adapted to straddle said bar,
each of said sections having a centering pin ex
tending into said bar and having means adjacent
‘ to said pins for spacing said grate bar and said
of the channel is for a special form of casting em
.ployed in front of the fire door,> the .details of
which will not be described here as they have no
supporting bar.
bearing on the present application. It will be
understood that the front and rear grates are so' 3. A dump grate section consisting of a rec
tangular plate having a forked projection on the
under side thereof adapted to receive a grate sup
Dumping mechanism
Aport; a dowel pin projecting from said plate into
saidïsupport, means for pivotally supporting said
For convenience in rocking .the dumping grate
plate on said support close to said pin, a plurality
unit, is provided a cylinder 84 which is pivotly
mounted on the pin 85 and is provided with a
of ribs formed on the upper side of said plate hav
piston rod 88 which is connected to the forked
ing air outlet ports formed therein, said plate
having openings therein communicating with said
end 81 of the rock lever 88, which is secured to
ports directly under said ribs, said plate having
.the bar 2l by means of the bolts 89. The link 90
depending sides, said sides having seating grooves
extends to duplicate levers 88A which are not shown
in these drawings, but it will be understood that
formed therein, the lower portions of which slope
downwardly and outwardly, sealing rods disposed
as many of these must be employed as is neces
sary to occupy the space between the front and
rear grates. A fluid pressure is admitted to and
within vsaid grooves, one end of said plate being ;`
released from the cylinder 84 in any convenient
form a ledge and the other end of said plate ex
inclined downwardly and then horizontally to
tending downwardly to form a shoulder approxi
side thereof, the lower portions of the grooves
mately the same distance from the top of said
plate as is said ledge, and a plurality of transverse
ribs connecting said first mentioned ribs adapted
being inclined outwardly, and a sealing rod in each
groove, adapted to rest upon the inclined faces of
the grooves in adjacent sections.
to prevent the complete dumping of ashes from
’7. In an apparatus of the class described, the
the top side of said plate when said plate is in
combination of a horizontal channel member con
stituting a dump grate supporting bar, having
clined for dumping purposes.
4. The grate section as defined in claim 3,
dowel holes formed along one leg thereof, a bear
characterized by having .a forked projection on
ing grate disposed at each end of said bar, a trun
the under side thereof, a channel bar a plurality 10 nion secured to each end of said bar in said grate,
a plurality of removable dump grate sections
of said sections mounted side by side on said chan
nel shaped bar, said channel bar having a trun
mounted on said supporting bar, each of said
dump grates having forked extensions on the un
nion secured at each end thereof, a bearing grate
at each end of said bar support having a bushing
der side thereof adapted to stradd-le said bar, each
of said sections having a dowel pin projecting
therein adapted to receive said trunnions and
downwardly therefrom adapted to register with
means for dissipating the flow of heat downwardly
from said grate to said bearings.
the holes in said bar, the adjacent sides of said
5. A skirt for dumping gratos consisting of a ñat
dump grate sections having recesses formed there
in, each recess having a sealing rod disposed there
vertical member having a notch formed along the
middle thereof for the reception of a grate sup
in, the endmost dump grate sections having skirts
adapted t0 extend downwardly along side of the
porting channel, one end of said skirt having an
bearing sections when said dump grates are in
arcuate edge and the other end of said skirt hav
clined for the purpose> of preventing the lodgment
ing a ledge formed at its outermost end adapted
to stop-against an adjacent member.
of obstructions therebetween.
6. A grate bar for supporting a bed of fuel,
characterized by having grooves formed along the
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