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DecQa, 1946. R1 V¢_ _WRIGHT . 2,411,918 `GRATE FOR BURNING SOLID FUEL Filed Sept. 5, 1944 6 Sheets-Sheet 2 Dec» 3, 1946- R. c. WRIGHT ' _2,411,918 @RATE FOR` BURNING soLID FUEL. I „x - Filled Sept. 5, 1944 v I ' > f6 Sheets-Sheet 3' \„>\§>\\ \\\\\\`\\\\\\\\\\\\\\\\\\\`\\\\\\\$ _ î’ Ä Imm l. m“, . .%\\ ,.`. m . 1|. / .L.Il Q4“ NN .4 . ,m @à - Dec.3, 1946. l >RvcfWRlGH-r ` I 2,411,918, GRATE FOR BURNING SOLID FUEL Filed sept. 5, 1944 e sheets-'sheet 4 .-37 /40 "37 V m5< *by „ »' A "i _ . n >[v1/@Wok C Wwe/97." 5km Ära/mfr GRATE FOR BURN'INGVSOLID FUEL Filedl Sept. 5, 1944 ' 5;@ _Qi I imi.“ 6 Sheets-Sheet _5 ä g; n ' Lì Üec. 3, 1946. R. c. WRIGHT GRATE FOR ÈURNING SOLID FUEL ' Filed sept. 5, 1944 6 Sheets-Sheet 6 I'. /î C. l/l/H/G/v/fl . 5km, Patented Dec. 3, 1946 2,411,918 .- . _. . UNITED STATES PATENT OFFICE 2,411,918 GRATE FOR BURNING SOLID FUEL 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) 1 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.` Y Y 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 been devised. ` 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. ,n 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 zoning of the plenum chamber. ' exposed to the fire. The, only portion of the a very narrow strip on top- of each rib. Cross `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 2,411,918 3 4 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 which: 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 sectio-n. 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. similar parts 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 v An angular foot BI projects laterally from the member 53 2,4“11,918' and bears yagainst'th‘e si'de web 50 and holds the member 56 in a vertical plane. ’ Y -' 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 '6 manner 'toîproduce a rocking'` motion at'the levers Special 88. -attention n ' is drawn ' to' the boss - 9|." 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 grate. ~ - y ‘ V 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 f ' 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. y 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 stationary. 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 2,411,918 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 RICHARD C. WRIGHT.