US1986117A - Furnace grate or fire pot - Google Patents

Description

Jan. 1, 1935. A K 1,986,117

FURNACE GRATE OR FIRE POT Filed July 17, 1933 3 Sheets-Sheet '1 INVENTOR." HHRULD F 01 LHC'K Jan. 1, 1935. H. POLLACK FURNACE GRATE OR FIRE POT Filed July 17, 1955 3 Sheets-Sheet 2 Jan. 1, 1935. PQLLACK FURNACE GRATE OR FIRE POT Filed July 1'7, 1935 S Sheets-Sheet 3 INVENTOR. HHFFULD PULLHCK ATTORNEY Patented Jan. 1, 1935 "UNITED STATES 'FURNACE GRATE 0R FIRE POT Harold Pollack, NewYork, N. Y., assignor to Bituminous Crucible Company, N. Y., a corporation of New York New York,

Application July 1'7, 1933, Serial No. 680,845 In Canada April '7, 1933 18 Claims. (Cl. 126- 176) My invention relates to furnaces and more particularly to grates or fire pots of the basket type especially adapted for use in connection with rectangular combustion chambers.

At the present time furnaces adapted for burning bituminous and anthracite coalare generally provided with agrate upon which the coal is supported, the coal being piled up in the combustion chamber above the grate and against fire brick or other fixed walls. Air for combustion is generally admitted to the furnace or combustion chamber below the .grate and rises through the grate, glowing embers, and coal for mixture with the gases expelled from the coal for combustion. Ashes accumulate on the grate requiring the shaking down of the fire from time to time in order to permit circulation of air in the manner specified. However, such shaking does not freely loosen or expel ashes which have accumulated around the side walls, so that, even though the ashes are shaken through the grate from the bottom ofthe fire there will be ashes accumulated around the fire brick at the sides of the combustion chamber thus diminishing the supply of air for admixture with the gases for combustion, resulting in imperfect combustion, hence loss ofheat units, and in the case of certain coals a great quantity of smoke and soot.

The general object of my invention is to provide furnace grate structures which may be installed in existing furnaces after removal of the usual type of grate above referred to, and providing a greater supply and circulation of air for combustion, as well as affording expelling or shaking down the ashes accumulated at the sides of the fire. This is .due to the fact that grates or fire pots constructed in accordance with my invention have movable elements constituting side Walls, or some of the sidewalls, which move preferably simultaneously with the bottom grate bars. Furthermore, the construction and arrangement is such that grates or fire pots embcdying my invention, even though of consider,- able size for large furnaces, will effect breaking up of the coked fuel when the parts are moved to shake down the ashes or to regulate the supply of air. So far as I am aware, I am the first person to have provided an operative structure for the accomplishment of the foregoing in connection with a rectangular furnace structure.

There being different sizes of furnaces having rectangular pits or chambers which receive the grate, I provide for making the grates embodying. my invention of sizes corresponding substantially to the standard furnace fire chambers,

preferably with provision for means of effecting adjustment of the grate to meet any variations in the standard existing furnace chambers. In this connection I would mention that inmost cases the chambers are provided by brick walls 5 and the front plate-of: the furnace, all of which are more or less permanent structures. Furthermore, grates constructed in accordance with my invention preferably have marginal portions disposedin; a substantially horizontal plane to 10 abut the inner surfaces of the walls of the furnace so that air may circulate between the walls and thesides of the grate foradmission through the sides, as well as the bottom, to greatly in-- crease the supply and circulation of air to and 15 through the fire and the fuel for admixture with the gases expelled from the heated fuel, whereby coal of relatively volatile nature may be burned withsubstantially no creation of smoke as com-'- pared tothe generally existing grate structures 20 hereinbefore mentioned.

'In actualpractice, I have found that-where agrate embodying my invention replaces a grate of usual construction in an existing T furnace structure, that more heat-units :are obtained, 25 substantially no's'mok e is created, at least none is noticeable when'observing the chimney either when or immediately after firing, or at any other time during operation, and at the same time less fuel is consumed. In the case of bitumi- 3Q nouscoal, the greatly increased supply of air, possible regulation of the supply of airQbreaking up of the fire in several directions when shaking the grate structure, greatly facilitate coking the fuel.

All of the objects and advantages of the invention will become apparent and will beparticularly pointed out during the course of-the following detailed description of the accompanying. drawings, in-which is shown a preferred em- 0 bodiment of the invention, and wherein Fig. 1 is a perspective; view of a'grate or, fire pot embodying the invention shown positioned relative to fragments of walls and the front plate of a furnace;

Fig. 2 is an elevation of a' fragment of the front of a grate embodying the invention;v

Fig. 3 is a top plan view of a corner or fragment of the same. grate. with parts broken away;

Fig. 4 is aperspective view of a nutemployed 50 to hold certain parts in adjusted position;

Fig. 5 is aside elevation partly in section of Fig. 6 is'a view taken on the line (S -6' of Fig.5;

the grate shown in Fig. 1;

Fig. 14 is a fragmentary side view of the parts shown in Fig. 13;

Fig. is another view similar to Fig. 6show ing a further modification in the means for moving the grate bars; and

Fig. 16 is a fragmentary side elevation of the parts shown in Fig. 15.

Referring in detail to the drawings and par ticularly to Fig. 1, the numeral 8 designates the side'and rear brick walls of the furnace, defin- 'ing in connection withthe front plate 9, the

chamber for the reception of thegrate, the lower portion of which, of course, is the ash pit and the portion above the grate being the combustion chamber. Uprights 10 rest on the bottom of the ash pit, and in order to provide for vertical adjustment of my grate relative to existing fur nace structures, I may provide each of the uprights 10 with a toothed face 11. These uprights 10 form part of the base supporting structure to hold the grate above the ash pit and coop- ,erate with depending arms 12 on the cross bars .13, 13'. It will be noted that the arms 12 also have a toothed face confronting the toothed face on the upright 10 with the teeth of each in mesh, and-the arms 12 and uprights 10 are also provided with registering slots 14 which receive bolts 15 extending all the way through the arms 12 and uprights 10 to receive nuts which, when tightened, will hold the parts in any adjusted position to support the grate in any desiredposition relative to the floor of the ash pit and the boiler above the fire. The bars13, 13 overlap and are provided with slots 16 adapted to register to receive bolts 1'7 extending'through the parts 13 and 13 also to receive nuts which, when tightened, will hold the bars 13, 13"in any desired laterally adjusted position. Thus, the base or supporting structure for the grate may be adjusted vertically and'laterally to fit within different sized furnaces, and there being only one of the supporting structures at each end of the grate and the same being unconnected, it isnot necessary to provide for longitudinal adjustment of the. supports. Consequently, it is necessary to carry in stock only standard sized parts 10 and12-13.

' The grate proper includes carrier or side bars,

'23 on bar 24 extending across the front of the grate adjacent the front plate 9 of the furnace andhaving its ends beveled to rest on correspondingbeveled surfaces on-the ends 19-of the carriers 18. Each of the ends 19 is also provided .(see Fig. 5) with an opening 25, and a front plate 26 is formedwith'corners 27" to the bottom of which are secured lugs 28, the lugs at opposite sides of the front plate being disposed in the openings and the bottom of the plate 26 resting on the top of the plate 24. The upper central portion of the plate 26 is recessed and surrounded by a flange or lip 29 which is adapted to register with the furnace door opening in the front plate 9. Beneath the flange or lip 29 are openings 30 formed in the front ,wall of the plate 26 for passage of air to the fire. At the top of the corners 2'? are horizontally disposed flanges 31.

At the rear of the grate is an end carrier 32 similar to the carriers 18, but, in the instance shown, I of lesser length, and having its ends beveled corresponding to the beveled ends of the plate 24 to engage against beveled surfaces on the ends 19' at the rear of the grate. Above the rear ends 19 of the side carriers 18 are .corner pieces 34 similar to the corners 27 and having depending lugs engaging in openings in the ends 19. Between the corners 34 across the grateand at its top is a plate or collar 35 having its ends ofiset as at 36 to receive angle clips '37. Similar plates 38 are mounted along the sides of the grate having one end disposed beneath the clips 3'7 and their other ends also oifset as at 39 and disposed beneath front clips 40, which rest also on the flanges 31. As shown in Fig.3, the clip 40, like all of the other corner clips, is provided with a longitudinally disposed slot 41" in the plane of the side of the grate and a'transverse slot 42 in the plane of the front and back. These slots register with similar slots in the oifset ends 39 of the side plates 38, offset ends 36 of the rear plate 35 and flanges 31. Jam nuts shown in detail in Fig. 4, and indicated generally by the numeral 43, are mounted through the slots with the head 44 engaging against the tops of the clips, the shank extending through the registering slots and the end 45, which has cam faces, disposed against the bottoms of the offset ends 39, 36, and flanges The clips thus hold the top plates 35, 38, and

front plate 27 together, and the rear corners 34 have at their tops projections 46 which extend into openings in the rear clips 3'7 to hold said corners in upright position.

As shown in detail in Fig. 6 the collars 38 and top walls-of carriers 18 are provided with alined g5;

the trunnion 50. The sides of the keys 53 are beveled as indicated at 55 (Fig. '7) and the carriers 18 are provided with recesses 56 (Fig. 5) having beveled sides to receive the beveled sides 55 of the keys. When the keys are inserted they look the grate bars in position and afford the bearing surface for the shoulders 52. The carriers 18 are also provided with recesses 57 in alinement with the openings 50. The recesses 5'7 form a bearing for the trunnions 53 on the horizontal grate bars 59. A toothed segment 60 is keyed to each end of the grate bars '59, thatis, to each of the trunnions 58 and meshes with the teeth on the segment 61 keyed to the lower end of each of the trunnions 50 of the vertical grate bars. The carriers 18 also have (see Fig. 3) beveled slots 62 receiving upright keys 63, the sides of which are beveled as at 64 to fit the beveled slots 62. The keys 63 have a notch 65 in their lower ends which is disposed over the trunnions 58 when the keys .72 depending ears are in the position shown in Fig. 6', wherein the upper end ofeach of the keys 63 is in ali'nement with and prevents withdrawal of-the key 53.

In the embodiment shown in the drawings, there are nine horizontal grate bars and. eighteen vertical side grate bars and five rear ver:- tical grate bars 51'. The latter are not connected in any way with mechanism .forimparting movement thereto but have their ends 50. disposed in openings 48 in the rear carrier32 and trunnions 43 at their top similar to the trunnions 49 disposed in openings 47" in the collar 35. The rear vertical grate bars are consequently movable as hereinafter explained.

The grate shown in the drawings being of considerable sizeand being manually operated to shake itthere would preferably beitwo shaker rods one controlling four of the; horizontal and alined: vertical. side bars and the other controlling the remaining horizontal and.'vertical bars. In Figs. 5 and 6, the separate connection; of v the shaker bars 66 and 69, one on the right and one on the left. of the furnace is illustrated. The rod 63 is connected to a. coupling '70 on the'bar 71 to which are connected as bybolts 73 of the horizontal grate bars. The rod 69 is connected to a similar: coupling. 70 on a plate, 71' also pivotallyconnected to the remaining horizontal grate bars. The bar 69 is shown in Fig. 1 connected to a lever actuatingmechanism of known type designatedgenerally by the numeral 75. When the rod 69 is reciprocated the bar '71 is also recipro'cated and the. grate bars 59 are oscillated on their trunnions. 58, thus oscillating the segments 66 and 61, hence also oscillating the vertical side grate bars.

Referring to Fig. 3, it will be noted thatthe collars 38 are provided with a plethora of openings I6 and thecarriers 18 also have openings 'I'lbetween the keys which lock the grate bars in. place, all of said openings being for passage of air. With the grate installed as shown. in

- Fig. 1, air can enter the ash. pit beneath the grate, circulate between the vertical gratebars and walls of the furnace through the openings between the vertical grate bars at the sides and back of the grate also through the space between the horizontal grate bars at the bottom and through the openings 77 in the carriers 18 at the bottom of the fire and through the openings 76 in the topplates or collars. Furthermore, movement ofthe rods 68 and 69 will turn the bars'59 on trunnions 58 and hence the segments 60 and 61, so that the vertical grate bars as well as the horizontal grate bars maybe adjusted to difierent open positions to increase or diminish the supply .of air.

Before discussing the operation of the grate, I would refer again to its installation and particularly to the provision for adjustment of the grate to meet varying conditions or sizes of furnace chambers. Let us assume, for instance, that the grate is to be installed in a furnace structure having a rectangular space sin and a half feet long, each of the horizontal grate bars 58 may be six inches wide and nine of these with space between figured in would make the length of the bottom of the grate sixty-two inches. This length is fixed and not adjustable as the side carriers 18 of each grate are made of a definite length according to the number of bars they support. The rear vertical grate bars when installed in position incline slightly back the, vertical grate bars more or a replacement of vertical or horizontal, it is not necessary to disand the frontiplate inclines slightly forward, so that-thalengthofthe grate from the back edge of the plate 35 to the front edge of theplate 2.7 or clips 40 would be about seventy-four inches. With a chamber seventy-eight inches long, there would be four'inches shortage, so to take care of this the jam nuts are loosened plate 27: and back plate 35 inclined to the dotted line position of Fig. 5'unti1 the grate completely fills the chamber, that is, until the back edge of the plate 35 is in contact with the wall and the front and the lip "29 is in contact with the furnace front. The same'adjustment may be made by dropping one or both of the sides 33 to incline less as required. Of course, the possible amount of adjustable movement is limited by the length of the slots through which the jam nuts extend and any variations over six inches would call for a different length of carrier. After the grate has been adjusted to contact the walls of the chamber, the jam nuts are turned, so that the cam faces will tighten the parts and hold them in proper position. 1

The fire is built preferably in a concave condition, that is, the coal is banked toward the sides and back of the grate up on top of the plates 35-and 38 sloping from each side and the back down to the middle. The side vertical grate bars are eitherin the position of Fig.1, that is, open any desired extent or substantially alined in a common plane which might be termed closed position. In either event, when it is necessary to shake the fire, the lever mechanism '15 is operated to reciprocate the rods68 and 69, so that the horizontal grate bars and vertical side grate bars will be oscillated to shake the ashes down from the sidesas well as the bottom of the fire. Such shaking movement breaks'up the fire, and since the rear vertical grate bars are loosely mounted, the breaking up of the fire will tend to move the rear vertical grate bars, and hence shake ashes from the rear of'the grate.

-If, at any time, it becomes necessary to make any of the grate bars either mantle the whole structure, as the keys 53 and 63 are removable, and, of course, the segments 60 and 61 are removably keyed to the ends of the trunnions 58 and 50 respectively. Therefore,

after removing the keys 53 and 63, the cotter pins or other means for keying the segments to the trunnions of the grate bars are removed, permitting removal of any one of the side or bottom gratebars for replacement.

In Figs. 8-17 inclusive, the numerals 56, 51", 38 designate the corresponding unprimed parts of Figs. 1-6, namely, the bottom grate bars, upright grate bars, and top collars respectively.

Referring to Figs. 8 and 9, the side carrier plates 80 have openings 81 through which extend trunnions 82 of the bottom grate bars 59', the trunnions 82 being longer than the trunnions 58 of Fig. 6, and having at their outer end upstanding fingers 83. The tops of the side carriers 89 also have openings 84 receiving the trunnions 85 on the side grate bars 51', the lower ends of the trunnions 85 being connected to forked mema has 86 between the arms of which are disposed the upstanding fingers 83. Obviously, when the bottom grate bars areshaken as by the mechanism shown and described in connection with 'Figs'. 1-6, the trunnions 82 will be oscillated and the fingers 83 will swing like an inverted pendulum alternately engaging the arms of the yoke members 86 and hence oscillating the. side grate bars 51. I

In Fig. 10, I have disclosed an arrangement whereby the bottom grate bars and Side grate bars may be independently moved. ,The bottom grate bars have trunnions 88 disposed through openings 89 in the side carrier and also have the depending lugs 73 connected to the shaker plate 71'. The bottom grate bars 59 of Fig. 10 are oscillated in exactly the same manner as the bottom grate bars of Figs. and 6, but their movement does noteifect movement of the side or upstanding grate bars, because there is no connection therebetween under the arrangement of Fig. 10. The trunnions 52 of the side grate bars are disposed in openings in the topv of the side carrier as in Fig. 6, but the side grate bars 51' have connected thereto laterally extending lugs 90 connected to the shaker bar 91 similar to the shaker bar 71 and operated by mechanism such as disclosed in connection with the shaker bars 71 of Fig. 5. 'Under the arrangement of Fig. 10, the upright grate bars may be'oscillated at any time without oscillating the bottom grate bars and vice versa. I r

In Fig. 11, I haveshown an arrangement similar to Fig. 10, but wherein I provide a connection between the trunnions of the side grate bars and bottom grate bars, so that shaking movement of either the bottom or side grate bars will effect shaking movement of the other. This is accomplished by providing the side grate bars with the lugs 90' connected to shaker bar 91 and the bottom grate bars with the lugs 73 connected with the shaker bar '7l- The trunnions 88' of the bottom; grate bars arekeyed tosegmental gears 60' similar to the segmental gears 60 of Fig. 6, and the trunnions 52 of the side grate bars are keyed to segmental gears 61" the same as in Fig. 6. Under this arrangement, it is quite obvious that manipulation of the shaker lever connected with the bar 71 will effect shaking movement of both the bottom and side grate bars, as also will manipulation ofthe shaker lever connected with the bar 91'. I

In all of the embodiments of the invention thus far described, the side bars and bottom bars have oscillating movement, that is,they are pivotally mounted and turned on their trunnions mounted through the side carrierand the upper collar plates. It is not essential to the practice of the invention, that such motion be imparted to the side grate bars to effect shaking down of the ashes at the sides of the grate, and in Figs. 1216 I have disclosed mechanism forefiecting other movements of the side grate bars.

In Fig. 12, the collar plates 38 are provided with relatively wide openings 98 and the side grate bars 51' do not have trunnions at their tops and bottoms but have their tops disposed in the openings 98, said openings being of a length corresponding to the width of the grate bars so as to house the tops. At their bottoms, the grate bars are provided with outwardly extending lugs or brackets 99, each having an opening 100 within which is disposed an eccentric 101 keyed to a rod 102 leading out through the wall of the furnaceto a crank or handle for rotating the rod. The rod is rigidly supported in bearings, not shown, and which may be formed in the furnace wall so that the rods will support the grate bars at opposite sides of the grate. It will be noted that the lower ends of the grate bars are spaced from the side carrier which is provided with openings in its side wall and designated by thenumeral 103 to receive the trunnions 104 of the bottom grate bars, which, as in the case of Fig. 11, are provided with depending lugs for connection with the shaker mechanism disclosed in Figs. 16. It willthus be understood that the bottom grate bars are oscillated or shaken in the manner already described, and that such movement does not effect movement of the side grate bars. When the rod 102'is rotated, the eccentrics 101 are also rotated within the openings of the lugs 99, so that the side grate bars will be swung from left to right of the position shown of Fig. 12, and also moved up and down at the same time.

In Figs. 13 and 14, I have disclosed mechanism for effecting oscillation of the 1 bottom grate bars inthe'manner described in connection with Figs. 1-12, and to also effect an .up and down movement to the side grate bars. The side grate bars 51. instead of having a trunnion at their lower ends have a substantially fiat end as designated by the numeral 105, and the upper ends are also disposedthrough the openings 98' in the upper collars similar to the openings 98. The lower ends extend through openings 106 in the tops of the side carriers and rest on cams 107. As shown in Fig. 14, each of the cams 107 has two humps 108 supporting the side grate bars. The cams 107 are keyed to the squared ends 109 of the trunnions 110 of the bottom grate bars. When the bottom grate bars'are oscillated as hereinbefore described, the cams will also be oscillated and the side grate bars will be raised and lowered, sliding up and down through the openings 106 and 98' to shake the ashes down.

The arrangement shown in Figs. 15 and 16 is similarto that shown in Figs. 14 and 15, except that the side grate bars may be provided at their tops and bottoms with extensions 111 and 112 respectively and mounted through openings in the collars 38 and side carriers to hold the grate bars in proper position. The bottom grate bars have trunnions 110' with squared ends 109 receiving the cams 113. There is a clearance between the top and bottom of the grate bars and the side carriers and collars 38, and the stem 112 normally rests in a notch 114 in the cam 113. Obviously, when the bottom grate bars are oscillated the cams 113 will be oscillated and the stems 112 will alternately be engaged by the projections or humps on each side of the notch 114 so that the grate bars will be given an up and down motion to shake the ashes down from the sides.

I claim:

1. A grate or fire pct comprising a plurality of horizontally pivoted bars forming a substantially rectangular grate bottom, a plurality of substantially vertical bars alined in pairs at opposite ends of each of the first bars and form ing sides of the grate, means for oscillating said horizontal bars, and means operable by oscillation of said horizontal bars for imparting movements to the vertical bars.

2. A grate or fire pot comprising a plurality of horizontal grate bars each journaled upon horizontal axes and forming a grate bottom, ,a plurality of substantially vertical grate bars alined in pairs at opposite ends of the horizontal bars and forming upright side walls of the grate, means to oscillate said horizontal bars, and a separate connection between each of said horizontal bars and said upright bars for imparting movement to the" latter when the former areoscillated. I 1

3. A grate or fire pot comprising 'a'plurality of horizontal grate bars formingra rectangular grate bottom, a plurality of substantially verti-' cal grate bars ali'ned in pairs at opposite ends of the horizontal bars and forming upright'walls of the grate, means to oscillate-said horizontal barsgand a separate connection between each of said horizontal bars and'said upright bars for imparting oscillating movement to the latter when the former are oscillated, said bars, being individually removable from the grate structure.

4. A grate or fire pot comprising a plurality of horizontally pivoted bars forming-a substantially'rectangular grate bottom, a plurality of substantially vertical bars alined in pairs at;op= posite=ends of each of the first bars and forming sides of the grate, all of said bars'beingjoscillatable', means for oscillating said horizontal bars, and meshing gears on said horizontal bars and said vertical bars for imparting oscillating movements to the vertical bars by oscillatin movements of the horizontal bars.

5. A rectangular grate or fire pot having a plurality of pivotally supported bars forming a rectangular bottom, a plurality of upstanding bars forming sides of the grate, plates pivotally supporting said first bars, plates supporting the upper ends of said second bars, and corner pieces spacing said first and second plates and adjustably connecting the ends of said second plates and afiording movement thereof to tilt said side bars.

6. A grate or fire pot having a plurality of grate bars forming a rectangular bottom, a plurality of upstanding bars forming sides of the grate, plates supporting the ends of said first bars and the lower ends of said second bars for oscillatory movement, plates supporting the upper ends of said second bars, corner pieces spacing said first and second plates and 'adjustably connecting the ends of said second plates and affording relative movement thereof to tilt said side bars, and means to oscillate all of said bars.

7. A grate or fire pot comprising a plurality of horizontal grate bars having trunnions at their ends, carrier bars having journals receiving said trunnions, a plurality of side grate bars upstanding at opposite ends of said horizontal bars and forming sides of the grate, removable keys on said carrier forming a journal for said upstanding bars, removable elements holding said keys in place, and means for collectively oscillating said horizontal and upstanding bars.

8. A grate or fire pot comprising a plurality of horizontal grate bars having trunnions adjacent their ends, carrier bars having journals receiving said trunnions, gears on the ends of said horizontal bars, a plurality of side grate bars upstanding above said carrier bars and pivotally supported thereby and. forming side walls of the grate, gears on the lower ends of said upstanding grate bars meshing with said first gears, and means for oscillating said horizontal bars and gears carried thereby to also cause oscillation of said second gears and bars.

9. A grate or fire pot comprising a plurality of horizontal grate bars having trunnions at their ends, carrier bars having journals receiving said trunnions, a plurality of side grate bars standing above and supported at their lower ends by said carrier bars and forming side walls of the grate, meshing gears on the ends of said horizontal bars and upstanding bars, and. collar plates above said carrier bars pro'vidin'g j ouriials' for the upper'ends of saidupstanding,'grate'bars; 10." A grate or fire -pot"c'omprising a Y plurality or horizontal "grate bars having trunnions at their ends, carrier bars having fiournals re'eeiv ing said trunnions, a plurality of side grate bars standing" above and supported "at their lower ends by saidcar'rier bars and forming sidewalls of the grate, meshing gears on the'ends of said horizontalbars and upstanding bars,collar plates above said carrier bars providing journals for the upper ends of said 'upstandinggrate bars, and means adjustably connecting said eonar piatesand affording tiltll l'g movement of SE lid upstanding grate bars: I a ll. A g'rate orffire p'ot comprising a plurality of horizontalgrate bars, carrier bars supporting said horizontal grate bars and afiordingoscillaF ingmov'einnt ,jthe'reof upstanding grate bars supported at theirlo ends by "said carrier bars for osc'niatingmdvinent; plates "slows-said, carrier bars providing journals for the upper ends of said side grate bars and disposed in a substantially horizontal plane and projecting outwardly beyond said side grate bars, and means for oscillating said horizontal and upstanding grate bars.

12. A grate or fire pot comprising a plurality of horizontal grate bars, carrier bars supporting said horizontal grate bars and affording oscillating movement thereof, upstanding grate bars forming sides of the grate, plates above said carrier bars movably supporting the upper ends of saidside grate bars and disposed in a substantially horizontal plane and projecting outwardly beyond said side grate bars, means for osci1lat-' ing said horizontal bars, and means at the ends of said horizontal bars and the lower ends of said upstanding bars to impart movement to said upstanding bars when the horizontal bars are oscillated.

13. A grate or fire pot comprising a plurality of horizontal grate bars, carrier bars supporting said horizontal grate 'bars and affording oscillating movement thereof, upstanding grate bars supported at their lower ends by said carrier bars for oscillating movement, plates above said carrier bars providing journals for the upper ends of said side grate bars and disposed in a substantially horizontal plane and projecting outwardly beyond said side grate bars, means for oscillating said horizontal grate bars, and interengaging elements on each end of the hOTi-r zontal bars and the lower ends of said upstanding bars whereby oscillation of said horizontal bars will impart movement to said upstanding bars.

14. In a grate or fire pot including bottom carrier bars, corner pieces mounted on said carrier bars at the ends of the grate, collar plates at the top of the grate between said corner pieces, upstanding grate bars between said collar plates and carrier bars forming side walls of the grate,

ing bars being movably supported between said collar plates and carrier bars, and means detachably'securing all of said grate bars individuplates on approximately vertical axes and forming side and rear walls of the grate, and a front plate connecting opposite sides of the structure, a substantial portion of said front plate being of lesser height than said walls.

16. A rectangular grate or fire pot comprising upper and lower plates, means holding said plates in spaced relation, horizontal grate bars supported by said lower plates and forming the bottom of the grate, substantially vertical grate bars having their upper ends disposed in openings in said upper plates and mounted for up and down motion, means for oscillating said horizontal grate bars, and means carried by said horizontal grate bars engageable with the lower ends of said vertical grate bars to impart to said vertical grate bars up and down motion when the horizontal bars are oscillated.

17. The structure of claim 18 wherein the means carried by the horizontal grate bars for imparting the up and down motion to the vertical grate bars comprise cams on the ends of said horizontal grate 'bars supporting the lower ends of the vertical grate bars.

18. A rectangular grate or fire pot comprising upper and lower plates, means holding said plates in spaced relation, horizontal grate bars pivotally mounted between said lower plates, substantially vertical grate bars having their upper ends disposed in openings in said upper plates, means supporting the lower ends of said vertical grate bars, means to oscillate said lower grate. bars, and means independent of said last means to impart reciprocating shaking movement to said vertical grate bars, said upper plates which support the upper ends of the substantially vertical bars extending laterally beyond said bars and lower plates to provide an air chamber between said bars and the walls of a furnace structure.

HAROLD POLLACK.

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