US1901698A - Grate - Google Patents

Description

March 14, 1933. Q S BOWM 1,901,698

GRATE Filed May 4. 1931 Patented Mar. 14,. 1933 UNITED STATES OLIVER s. BOWMAN, or coLoRAnosPRINGs, coLonA'no enema Applicationifiled May 4, 1931. Serial. No. 5351.851.

and heaters of all types. 1

It is an object of this invention to produce a grate of such construction that it shall be especially well adapted for use with selffeeding furnaces that employ slack coal or 10 coal that has been crushed to reduce its size.

7 Another object of this invention is to produce a grate that shall have means for agitating parts thereo f'in such away that the fire can be cleaned of ashes and clinkers without seriously disturbingthe fire bed; The above and other objects that may become apparent as this description proceeds are attained'by means ofa construction and an arrangement ofparts that will now be describedin detail and for this purpose reference will be hadto the accompanying drawing in which the preferred embodiment of the invention has been illustrated and in which: I l a Fig. 1 is a diametrical sectionthrough a furnace equipped with my improved grate; Fig. 2 is a top plan View taken on line 22, Fig. 1, and shows a sector of the grate; Fig. 3 is a section taken on line 3-3, Fig. 2, and shows'the manner in whichthje tiltable sections of the grate are mounted; Fig. '4- is a section taken on 'line 44,

Fig. 3;

Fig. 5 is a section taken-on line 5-5, Fig. 4; and j Fig. 6 is a view showing the ring that is connected with the tiltable sections and which serves to tilt them about their axes.

In the drawing reference numeral 1" rep- 0 resents the surface of a floor or some. other hot air passageway 7, all'as is common in hot air furnace construction. Although this invention has been shown in connectionwith a'hotair furnace,=it is to be understood that the grate and'the other parts that co- PAT N operate with it are equally well adapted for boilers or any other heating appliance.

Secured to the inner surfaceof ring 2, or cast integral therewith, is an inwardly'extending flange 8 that serves as asupport for the grate sections. The lowerendof ring 4 extends inwardly a short distance fromthe inner surfaceof rin 2' so as" to form an overhanging shoulder 9. The grate is composed of a number 'ofsectors having upwardly inclined portions 10fthat when they are I assembled, form a conicalsurface such as indicated by reference numeral. 11in Fig. 1. The extreme tipsof thei'several sectorsjare provided with inwardly projecting projections 12 that are adapted toproject overa collar 13 onthe upright support 14:. This support has its lower end connected with a base 15 that "rests'ona supporting bar 16.; The ends of bar16 are secured to the inside'of ring "2. The lower ends-of the grate sections 10 are provided with outwardly extending projections that outer ends are connected as indicated at 18. The two arms 17 are spaced apart 'as shown in Fig. 2 andthe lower ends-of sections 10 are provided with bearings 19,-while the are formed from'two spaced'arms 17, whose transverse portions 18 have bearings 20..

The parts'17 are so'related to'th'e' parts 10 that when the grate is in placefthe partsl'? 'will lie in a horizontal plane. *In' the example illustrated, thereare sixteen sections of grate and when these are assembled, they form a complete upwardly extending coni'cal projection surrounding the support 14.- Mounted on each outwardly extending radial projection is a rockinggrate'segment 21.

These-segments when assembled form an annular; flat surface and each rocking grate segment is provided with trunnions 22 that engage in the' 'bearings '19 and 20. Each rocking grate segment is also-providedwith 1 a downwardly extending arm 23 that projects through the opening between member J provided with two diametrical slots 33 havway the height of the ringand the thickness 1 openings would pass into the ash pit.

17. The lower end of each arm 23 has a slot. The inner surfaces of the parts 24 on each side of the slot are convexly curved as indicated in Fig. 5. Supported on the upright 14 and the upper end of the base 15 is a wheel having a hub 25 and spokes 26. The outer ends of the spokes are connected by means of a rim '27 and this rim is provided on its outer surface with a number of radial projections 28, there being one projection for each rocking grate segment. The projections 28 extend into the slots and therefore when the wheel to which the projections are secured is rocked about its pivot, it will impart simultaneous rockingmotion to all of the rocking grate segments 21. r A

handle 29 is connected with the rim 27 and extends through slots in the ring 2 and in the sheet metal housing and when this handle is moved back and forth, the grate segments 21 will be rocked about their trunnions.

In the embodiment shown the coal is fed into the furnace and onto the grate through an inclined conduit 30. The upper end of this conduit may be connected with a hopper which has not been shown, and the lower end is curved so as to terminate in a portion 31 having avertical axis. The axis ofthe portion iii-preferably coincides with the axis of the support 14. Thecon- 'duit terminates a short distance above the upper surface of the grate-so that the coal all connected together so as to form a ring,

surface until it reaches .a predetermined V thickness and as the coal burns it will automatically be replaced with coal fromv the conduit, In order to determine the thickness of the coal,'a movable ring 32 has been secured to the end portion 31. Portion 31 is ing notches 34and thering 32 has inwardly extending pins 35 that project through the slots and engage the notches, and in this of the coal layer can be adjusted.

The furnace is preferably provided with a recess for the reception of the ashes as indicated in Fig. 1. V c

From the above description. it will be seen that the grate that forms the subject of this invention consists of a central conical portion with its apex upwards and whose base is surrounded by an annular flatgrate surface composed of a plurality of segments 21 that can be rocked simultaneously and which therefore serves to clean the fire of ashes and cinders and permit the latter to fall downwardly into the space below the grate. By'rocking the segments 21,-a better cleaning action isobtained than if they were as in the latter case only particles of such small size that they could pass through the This grate is especially well adapted for self-feeding furnaces of the type shown and has been found to be very efficient in operation.

Having described the invention what is claimed as new is:

1. A grate for a coal burning device comprising, a central conical portion'having its apex at the top, said conical portion being composed of a number of sectors provided at their lower ends with projections extend ing in a plane perpendicular to the axis of the conical part, each projection having two radially spaced bearings, a segment-of an annular grate portion rockably supported on each pair of radial bearings and means for simultaneously rocking thesegmental porconsisting of a plurality of sectors which,

when assembled forma cone-whose apex is upwards, the upper end of each sector. hav- 50 ing a projection at its top for engaging the support and a projection at its base that extends radially and lies in a plane that is perpendicular to the axis of the cone, th e outer ends ofthe radial projections extend ing over onto the ledge,each radial projection having two spaced bearings, a" section of anannular grate ring'supported on each pair of bearings, the several sections being each mounted to rock abouta radial axis, and means for simultaneously rocking all of the annular grate sections. 7 r

3. A device for burning coal comprising,- a fire pot having an inwardly extending ledge and a'central vertical support, a grate conp sisting of a plurality of sectors which, when assembled form a cone whose apex is upwards, the upper end of each sector having a projection at its top for engaging the support and its base provided with a radial projection that lies in a plane perpendicular to the axis of the cone, the outer ends of the radial projections extending over onto the ledge, each radial projection having two spaced bearings, a section ofv an annular grate ring supported on each pairvof bearings, the several sections forming an annular grate in which each section is mounted to rock about a radial axis, and means for simultaneously rocking all of vthesections, said means comprising'a ring mounted for rotation about the vertical support, the ring having a radial projection for each grate section and each grate section having'two spaced fingers that project downwardly one on each side of a projection, and means for oscillating the ring whereby the grate sec.- tions will be rocked about their radial axes.

In testimony whereof I affix my signature.

oLIvERs'. BOWMAN.

Images