US1436437A - Furnace - Google Patents

Description

(5. M. CROSSEN.

FURNACE. APPLICATION FILED MAY 9, 1921 Patented Nov. 21, 1922.

3 SHEETS-SHEET I.

my? Wa er Geoye/Z Crease.

G. M. CROSSEN.

FURNACE. I I APPLICATION FILED MAY 9, 1921. 1,436,437, Patented Nov. 21, 1922..

3 SHEETS-SHEET 2.

4" W FEE Patented Nov. 21,1922.

.UNITED STATES PATENT OFFICE.

ononen 1a. cnossnu, or MINNEAPOLIS, ivi'ruivnsora, assmuou or THIRTY bun nun'nnnnrrrs r0 LLOYD n. JG'NES AND TI-HRT'Y oun-nuunannrnsro HENRY LYONS.

FURNACE.

Application filed May'l), 1921. Serial No. 468,075.

T 0 all whom it may concern:

Be it known that I, Gnonen M. Cnossnx, a citizen. of the United States, residing at Minneapolis, in the county of Hennepin and State of hflinnesota, have invented certain new and useful Improvements in Furnaces; and I do hereby declare the following to be a full, clear,.and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

My invention relates to furnaces and, more particularly, to an improved grate structure and certain other cooperating devices, and has for its object to improve the same, as will hereinafter appear.

To the above end, generally stated, the invention consists of the novel devices and combinations of devices hereinafter dcscribed and defined in the claims. 7

In the accompanying drawings, which illustrate the invention, like characters indicate like parts throughout the several views.

ieferring to the drawings: 1 i

Fig. 1 is a plan view of the improved turnace with some parts removed and other parts broken away in section;

Fig. 2 is a front elevation;

Fig. 3 is a view principally in transverse vertical section, taken substantially on the irregular line 3-;) of Fig. 1;

Fig. l is a view in longitudinal central section taken on the line 4.--l of Fig. 1;

Fig. 5 is a fragmentary detail view of the grate bars and shaking mechanism therefor, with some parts in section substantially on the line 5--5 of Fig. l; c

F 6 is a view inside'elevation of the stoker conveying trough;

Fig. '7 is a perspective view otone oi the grate bar extensions orrimsections; and i Fig. 8 is a perspective view of one of the joint plates. y i

The masonry portion of the improved 't'urnace includesa base 9, front wall 10, side walls 11, top l2 and back or bridge wall 1.3, having a flame andsmoke passageway 14:,

which leads to the flues ot' a steam boiler, not

shown. At the .front of the furnace is an ash pit 15 formed in the base 9. The front wall lOis covered by a metallic door plate 16 having upper and lower pairs of door openlugs normally closed by hinged doors 17 and 18, respectively, the former of which open into the furnace above a grate structure and the latter of which open into the furnace below said grate structure. i

The grate structure is of annular formation and mounted to revolve on a vertical axis and includes a grate center 19, a sectional. grate rim 20 and radially disposed grate bars 21, located between said grate center and grate rim and mounted for rocking movement. A skeleton frame is provided to carry the grate center, grate rim and grate bars and includes concentric rings and 22 secured to radial arms 23 carried by a hub 24: rotatably mounted on a pintle 25 secured to the base 9. The grate center 19 closes the space within the inner frame rin 22 and is removably supported on bracket 26 secured tosaid ring. I

The radial grate bars 21 are rockably mounted onthe two rings 22 by providii'ig the "inner ends thereof withatrunnion 27 mounted in bores or seats in the inner ring 22' and by providing the outer ends of said grate bars with yoke-like seats 28 which straddle pintles 29 secured to and projecting radially inward from the outer frame ring 22. To look the grate bars 21 in position, keys or cotter pins 30 are passed'throug h the seats 28 below the'pintles 29. It will be noted that the inner ends of the upper surfaces of the grate bars 2l-are extended, at 3i, over the innertrame ring 22', and ,teri'niuate close to the pl-iriphery of the grate center 19.

The grate rim sections20 provide extensions of thegrate surface and areremovably supported on the upperedge oi the outer frame rim 22-, by forming on the under surfaces thereof depending radially spaced flanges or lugs which eml ace said rim and hold saidsections against radial movement thereon. Said grate rim sections 20 are held on the outer ring 22 against circumteu ential movement, and in alignment with the grate bars'21 by forming, in the inner lugs 2:52 thereof, notches '33 to receive the pintles 2-9.

The under surfaces of the rim sections 20,

36 laid in the masonry walls 10, 11 and 13. These joint plates are removably supported on the ledge 35 by forming on. the upper edges thereof depending flanges 37 which interlock with an annular shouldered groove 38 in the ring 36 at the junction of said ledge therewith. It will be noted that the outer edges of'the joint plates 34 and the flanges 37 extend into the masonry walls andentirely close the joint between said walls and the grate rim sections 20. Obviously, an ashes falling on the joint plates 34 will be scraped therefrom by the grate rim sections 20 and be precipitated onto the base 9, during the rotation of the grate.

The grate bars 21 are connected in groups of four, by tie bars 39, pivoted at 40 to depending lugs 41 on the outer ends of said grate bars. Each tie bar 39 is independently and intermittently oscillated to rock the respective group of grate bars 21 by a disk 42 having a crank pin 4%.) connected by a link 44 to one of the pivotal connections 40 of the respective group ofgrate bars 21. The disks 42 are secured to the inner ends of short shafts journaled in the outer ring 22 and have keyed to their outer ends gears 46. The gears 46 are circumferentially spaced and arranged to successively engage a segmental rack 47 during the rotation of the grate and be rotated thereby. This segmental rack 47 is carried by a swinging arm 48 pivoted to a bracket 49 secured to the base 9. and is of such length as to give each gear 46 one complete rotation while passing thereover. By means of the arm 48, the rack 47 may be moved from a position where it will be engaged by the gears 46 and rock the grate bars 21 to an inoperative position where said gears will pass thereby without rocking saidgrate bars. To accomplish this movement of the rack 47 to and from operative position. there is provided a handpiece-equipped operating bar 50, which is pivoted to said arm and works through the door plate 1.6. It is important to note that when the grate bars 21 are in upright or normal positions, the pivotal connections 40, for the links 44, the crank pins43 and the shafts 4-5 are on dead centers, thus holding the grate bars in said positions.

in addition to the pintle 25, the grate frame is further supported by a plurality of gears 51. which mesh with an annular rack 52 on. the lower edge of the outer frame ring 22. Said gears 51. except the one at the front of the furnace. areidle and loosely journaled on pintle-equipped brackets 53 secured to said base. The gear 51, at the front of the furnace, which is driven, is secured to the inner end of the shaft 54 journaled in a bearing bracket 55 secured to the base 9 and in a bearing 56 in the door plate 16. ()n the outer end of the shaft 54 is a gear 57 which meshes with a pinion 58 on the lower end of a vertical shaft 59 journaled in bearings on a bracket 60 secured to the door plate 16. The shaft 59 is driven by a horizontal.countershaft 61, which is connected thereto by a beveled gear 62 and has, on its outer end, apulley 63 over which runs a driving belt, not shown.

It will be noted that the rocking of the grate bars 21, to shake the ashes therefrom, caused by the gears 46 passing over the rack segment 47, takes place over the ash pit 15. Any ashes precipitated on the base 9, outside of the ash pit 15, are scraped into said pit, during the rotation of the grate structure, by ascraper blade 64 suspended from one of the frame arms 23 by means of hooks 65 on the upper edge thereof.

In connection with the improved I grate structure, I provide a co-operating stoker which includes a hopper 66 that extends from the door plate 16 radially over the grate structure to substantially the center thereof. The front end of the hopper 66 is supported on a bracket 67 secured to the inner face of the door plate 16. The lower portion of the side walls of the hopper 66 are made in detachable sections, so that in case they burn out, they may be removed and new ones substituted therefor. To protect that portion of the hopper 66 which extends below the arch or top 12 from heat, the lower longitudinal edges of said hopper are provided with outstanding flanges 68 on which are supported, fire tile or brick 69.

Extending longitudinally through: the hopper 66 is a feed trough 7 0 having a spiral edge 71 over which fuel is discharged onto the underlying grate bars 21. Mounted in the feed trough 70 is a spiral conveyor 72, the shaft 73 of which is ournaled in one end in a bearing on a bracket 74, attached to the outer face of the door plate 16, and at its other end in a bearing formed in the inner end wall of the hopper 66. The upper end of the shaft is also ournaled in a bearing on the bracket 74. To raise or lower the spiral feed edge 71 so as to varythe' distribution of fuel radially onto the grate bars 21, the feed trough 72- is mounted on the shaft 73 for turning movement on its longitudinal axis. Attached to the head or the outer end of the feed trough 7 (l, is ahand lever 75 by which said feed trough may be turned on its longitudinal axis to adjust the spiral feed edge 71. As shown, the hand lever 75 is fulcrumed on. the shaft 73 and rigidly secured at its short end to the head of the feed trough 70. Obviously, by manipulat ing the hand lever 7 the feed trough-7O may be turned on its axis to raise or lower the spiral feed edge 71.. It is thought that fric' tion will hold the feed trough 70 where set but if found necessary, any suitable means may be provided for securing said feed trough in different adjustments. The hopper 66 is provided with a feed throat 7 6 into which fuel is delivered and thereby conveyed into, the receiving end of the feed trough 70. t I

The spiral. conveyor 72 is driven from the shaft 59 by a short shaft 77 journaled in bracket 74- and is com'iected to said shaft 59 by a variable speed mechanism of any well known or standard construction, and indi (rated, as an entirety, by the numeral 78. The shaft 77 is connected to the shaft 73 by a pinion 79 which meshes with a gear 80 on said shaft 73.

During the rotation of the grate structure, fuel is spread circumferentially and radially thereon by the stoker, and the prodnets of incomplete combustion, at the front of the furnace, during their travel through the smoke and flame passageway 1a are re quired to pass over the hot flames at the rear of the furnace and a further supply of fresh air which completes the combustion, thus eliminating smoke and a waste of fuel. Just before new fuel is delivered onto the gratestructure from the stoker, the groups ofgrate bars are automatically and successively shaken at the time the gears l6 pass over the segmental rack 47 to remove the ashes therefrom. In case it is not desirable to remove the ashes from the grate, the rack l? may be moved into inoperative position.

\Vhat I claim is:

1. In a furnace, the combination with a revoluble grate frame and means for rotating the same, of radially disposed grate bars rockably mounted on said frame, connections includin circumferentially spaced gears and cranks for rocking the grate bars, said connections being arranged to normally lock the grate bars against rocking movement, and a rack with which said gears intermittently mesh during the rotation of the grate frame to rock the grate bars.

2. In a furnace, the combination with a revoluble grate frame and means for rotating the same, of radially disposed grate bars rockably mounted on said frame, connections including cireumferentially spaced gears and cranks for rocking the grate bars, said con-- nections being arranged to normally lock the grate bars against rocking movement, a rack with which said gears intermittently mesh during the rotation of the grate frame to rock the grate bars, and means for moving the rack to and from a position in which it will be engaged by said gears. I

3. In a furnace, the combination with an annular grate frame rotatably mounted on. an axial pivot and having an annular rack, of a plurality of circumferentially spaced gears which mesh with said rack, means for driving one of said gears, radially disposed grate bars rockably mounted on the grate frame, connections including air-- cumferentially spaced gears and cranks for rocking the grate: bars, said connections being arranged to normally lock the grate bars against rocking movement, a rack segment with whichthe gears of said connections intermittently mesh during the rotation of the grate frame to rock the grate bars, and means for moving the rack segment to and from a position in which it will be engaged by the gears of said connection.

a. In a furnace, the combination with a revoluble grate frameand means forrotating the same, of radially disposed grate bars rockably mounted on said frame, tic bars pivotally connecting the grate bars in groups, circumferentially spaced gearequipped cranks for oscillating the tie bars to rock the grate bars, and a rack segment with which said gears intermittently mesh during the rotation of the grate frame to rock the grate bars.

In afurnace, the combination with a revoluble grate frame and means for rotating the same, of radially disposed grate bars rockably mounted on said frame, connections including circumferentially spaced gears and cranks forrocking the grate bars, said connections being arranged to normally lock the grate bars against rocking movement, a pivoted arm having a rack segment with which said gears intermittently mesh during the rotation of the grate frame to, rock the grate bars, and means for swinging said arm to move the rack segment to and from a position in which it will be engaged by said gears.

6. In a furnace, the combination with a revoluble grate frame and means for rotating the same, of radially disposed grate bars rockably mounted on the grate frame,

means for intermittently rocking said grate bars, and grate rim segments supported on the grate frame and providing extensions of the grate surface.

7. In a furnace, the combination with a revoluble grate frame and means forrotating the same, of radially disposed grate bars rockably mounted on the grate frame, means for intermittently rocking said grate bars, and grate rim segments independently and removably supported on the grate frame, and providing extensions of the grate surface. 4

8. In a furnace, the combination with a revoluble grate frame including concentric rings and means for rotating said frame, of radially disposed grate bars having trunnions mounted in the rings of said frame for rock-ably supporting the grate bars, means for intermittently rocking said grate bars, and grate rim segments straddling the outer frame ring.

9. In a furnace, the combination with a revoluble grate frame including concentric rings and means for rotating said frame. of

radially disposed grate bars having pintles mounted in the rings of said frame for rock ably supporting the grate bars, means for intern'iittently rocking said grate bars, and grate rim segments straddling the outer frame ring, and having interlocking engage mentwith certain of said pintles for holding the same against circumferential movement of said frame ring. v

10. In afurnace, the combination witha wall structure, of a revoluble grate structure Within said wall structure and means for rotating the same, said grate structure including radially disposed grate bars and a grate rim outward thereof, a supporting ledge carried by the wall structure, and segmental joint plates removably supported on said ledge and extending into the Wall structure andunder-lapping the grate rim.

11. In a furnace, the combination with a wall structure, of a revoluble grate structure within said wall structure and means for rotating the same, said grate structure inchuling radially disposed bars and. a grate rim outward thereof, and having an oblique under surface, a supporting ledge carried by the i 'all structure, an d segmental oint plates removably supported on said ledge in oblique positions and extending into the wall structure and underlapping the oblique surface of the grate rim. 7

12. In a furnace, the combination with a Wall structure, of a revoluble grate structure within said wall structure and means for rotating the same, said grate structure including radially disposed grate bars and a grate rim outward thereof, a supporting ledge carried by the wall structure, and seg mental joint plates having separable interlocking engagement with said ledge and eX- tending into the wall structure and underlapping the grate rim.

13. in a furnace, the combination with a revoluble grate frame including concentric rings and means for rotating said frame, the inner of said rings having trunnion seats and the outer of said rings having radial pintles, of radially disposed grate bars having at their inner ends trunnions arranged to enter said trunnion seats by an endwise movement of the grate bars, said grate bars having at their outer ends yoke-like seats adapted to straddle the trunnion on said outer ring, and keys extended through said yoke-like seats below the respective pintles.

In. testimony whereof I aiiix my signature.

enonen MI] onossnu.

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