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Patented Oct. 29, 1946
2,410,266
` UNIT-ED ’STATES PATENT 10F F ICE
L`Fly Ash `Arrestor"Corporation, a‘oorporation of
Alabama
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Application February 5, 1943,. Serial-No.~.474,795
701mm. (01.'-112‘6--1635
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.'2
This .inventionkrelates to ¿furnace grates par
the rows of ,openingsïl I. `In the making of îthe
ticularly, lto the class employed in .furnaceswith
grate, ythe fins §IÍ3 'are 'joined ¿integrally with the
gratefbeinginserted in the 'sand'mold with'the
pattern'before the cast‘iron portionïI'U is poured,
and left protruding from the sand so lthat the
molten cast iron is poured around them. "In order
forced draftand which Aare subject >to intense
heat, `and‘hasfor an object Íthe provision of .an
article o'f the character designated .which rshall
be simple of«design, extremely sturdy, vand pro
vided with -especially éíiicient heat dissipating
to insure .a strong .juncture‘betwe'en îthexi'insand
the .cast’iron 'body ’ I 0, '.I may Aprovide ‘projections
means.
I'4 projecting from the sides ,of ‘the 'fins 'where
»Aefur'ther .object of .my .invention is to provide
acast iron grate withsheet. steel metalrins joined 10 they extend .intofthe cast ‘ironbody "-I'0. 'These
projections may be `'in the form ogf small‘pins’
integrally. theretov .by‘casting-the grate. around .the
fins.
A ‘further .objectof myêinvention is to provide
which are passed through suitable "holesî in ‘the
` iinsbefore the body‘portionis'v poured. The‘ñns
a .castiron grate with integrally .corrugated fins
I '3 .arepreferablymafde "fromstandar'd corrugated
cast in same and-improvedmeansior supporting 15 sheet. steelof about one-.eighth’inch thickness and
the gratein .theffurnaee
'
may vextend downwardly under ~the grate from
_'Asfis .wellÍknownin vtheart vto which my inven
tionrelatesv grates§in.,forced. draft furnaces, espe
boiler furnace, .or'intensityiof heat'to which thel
cially .Wherea .thin ñre andspreader stokers are
grates.maybesubjected
employed, are subject to'intense heat and often 20
[In 4designing .the .grate '.I .provide varadiating
fin surface six'timesthe area of the upper surface
burnout-or break. -Iiha-ve found that by provid
six `.to..tenfinches, .depending on the rating o'f the
.
ing a plurality of rows of sheet steel fins extend
ing from end to end of the grates and to which
of the grates, based on a calculated maximum
heat release of 370,000 B. t. u. per hour per square
the grates are joined by casting the strength of
foot of grate area. If a greater heat release is
the grates is materially increased and the heat 25 involved the iin surface is increased in direct
dissipating effect of the ñns is such that the grates
have an indefinite life. In addition, air for com
bustion may be passed over the corrugated fins
proportion to the increase in heat release.
It will be seen by reference to Fig. l of the draw
ing that the fins I3, being corrugated, afford not
and heated. By attaching trunnions for the
only increased radiating surface, but provide an
grates to the ñns, they are afforded an extremely 30 extremely sturdy beam structure for the support
of the grate. The grate is supported from trun
sturdy support which, being remote from the fire,is not subject to extremes of heat. To afford
nions I6 which are joined to bars I'I which in turn
additional security I provide projections on the
extend entirely across the end of the grate and
sides of the fins where they are cast into the
are welded to the ends of the fins I3. The trun
grates.
.
nions I6 rest in bearings I8 which in turn are
suitably Supported, as at I9, from supports posi
A grate embodying features of my invention is
illustrated in the accompanying drawing forming
tioned in the wind box I2. By reason of this
a part of this application in which:
means of support, even though the cast iron body
Fig. 1 is a top plan view;
of the grate be broken, the usefulness of the grate
Fig. 2 is a longitudinal section taken along the 40 is not gone as it is supported from the fins and
line II-II of Fig. 1; and
not from the body of the grate.
In case the grate is. to be employed as a dump
Fig. 3 is a transverse section taken along the
line III-III of Fig. 1.
l
grate, I weld a bar 2| across the bottoms of the
Referring to the drawing my improved grate
fins I3 and secure an arm 22 thereto provided
comprises a substantially flat cast iron body por 45 with a hole 23 to which suitable linkage (not
tion I0 provided with downwardly flaring air
shown) may be connected for dumping the grate.
The fins I3, in a grate constructed according
openings II therethrough. 'I'he grate is mounted
to my invention, function to add strength to the
over the usual wind box I2, so that air under pres
grate and to protect it from heat. They dis
sure in the wind box passes upwardly through the
openings II in the grate to support combustion, 50 tribute the heat from hot spots on the grate and
as is well understood.
thus minimize temperature stresses resulting from
Cast integrally with the grate is a plurality of
hot spots. The added distributing surface of the
corrugated sheet steel fins I3 which extend from
fins insures that no limited area on the grate
end to end of the grate and are relatively closely
shall become overheated. The fins providing
spaced, the rows of ñns being positioned along `
.many times the radiating surface of the grate
2,410,266
3
alone, distribute their heat to the air passing
4
the grate at each end thereof and welded to
the ñns, and a trunnion on each of the bars.
up through the grate from the wind box l2 and
3. A furnace grate comprising a plurality of
thus none of the heat to which the grates are
corrugated sheet metal fins spaced throughout
subjected is lost, but is used for combustion of
their lengths from adjacent ñns, a perforate body
the fuel. Also the fins, being made from mild
portion of cast iron cast about one edge of the
steel and securely joined to and forming a part
fins, and means for supporting the grate by the
of the grate, add many times the strength of
the body portion Ill alone and provide an excellent
4. A furnace grate comprising a plurality of
means of support for the body portion I0. Even
though the body portion be entirely broken, the 10 corrugated sheet steel fins spaced throughout
their length from adjacent ñns, a body portion
support for the grate is not impaired and its
of cast iron cast about one edge of the fins and
usefulness not impaired.
ñns.
From the foregoing it will be apparent that I
have devised an improved grate which is simple'
of design and economical of manufacture and 15
one capable of withstanding rigorous service.
While I have shown my invention in but one
form, it will be obvious to those skilled in the art
that it is not so limited, but is susceptible of
various changes and modifications, Without de 20
,
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t
having uniformly spaced holes between the fins,
a bar extending across the grate at each end
thereof and welded to the fins only, and a trun
nion on each of the bars.
» 5. In a furnace grate, a plurality of sheet steel
fins spaced throughout their length from adja
cent fins, a cast iron body cast about one edge
of the ñns leaving the major portion of the width
parting from the spirit thereof, and I desire,
therefore, that only such limitations shall be
placed thereupon as are specifically set forth in
the appended claims.
of said fins extending beyond the body, there
being uniformly spaced holes through the body
their lengths from adjacent fins integrally joined 35
and a trunnion on each of the bars.
on the under side thereof extending from end to
'7. A grate, as set forth in claim 6 in which the
fins are made of corrugated sheet steel and the
holes through the grate body are disposed in
sinuous rows paralleling the corrugations of the
between the fins for the passage of air through
the grate, and a'trunnion at each end of the
25 grate secured directly to the fins.
What I claim is:
6.1m a furnace grate, a plurality of sheet
1. A cast iron furnace grate comprising a body
metal fins spaced throughout their length from
portion having a plurality of sheet metal ñns
adjacent fins, a cast iron body cast about one
spaced throughout their lengths from adjacent
edge of the fins leaving the major portion of the
fins embedded therein on the under side thereof
and extending from end to end of the grate, and 30 width of said finsextending beyond the body,
there being uniformly spaced holes through the
supporting trunnions welded on to the fins at
body between the ñns for the passage of air
the ends of the grates.
through the grate, a bar extending across the
2. A cast iron furnace grate having a plurality
grate at each end thereof and welded to the fins,
of corrugated sheet metal fins spaced throughout
end of the grate, pins extending through each of
the fins where it is joined to the grate at intervals
throughout the length thereof for securing the
ñns in place in the grate, a bar extending across 40 fins.
I
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ELLIS W; BULLOCK.
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