Patented Oct. 29, 1946 2,410,266 ` UNIT-ED ’STATES PATENT 10F F ICE L`Fly Ash `Arrestor"Corporation, a‘oorporation of Alabama ` - l ' Application February 5, 1943,. Serial-No.~.474,795 701mm. (01.'-112‘6--1635 - .'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 , ‘ = Y 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 ’ ELLIS W; BULLOCK.