US1218199A - Furnace-grate. - Google Patents

Description

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FU E v APPLICATIO ILED MAR. 29. l9l 5.

1,218,199.l Patented Marg, 7.

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FuRNAcE GRATE.

Patented Mar. 6, 1917.

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WILLIAM JOHN MANI-IIRE, 0F DENVER, COLORADO, ASSIGNOR TO COMBUSTION .SPECIALTY C0., OF KANSAS CITY, MISSOURI, A CORPORATION OF MISSOURI.

FURNACE-GRATE.

Specification of Letters Patent.

Patented Mar. 6, 1917.

Application filed March 29, 1915. Serial No. 17,700.

To all whom t may concern: Y Y

Be it known that I, WILLIAM J. MANI-Inni, citizen of the United States, residing in the city and county of Denver and State of Colorado, have invented certain new and useful Improvements in Furnace-Grates, of which the following is a specification.

This invention relates to gratos for use in furnaces in which combustion is supported by forced draft, and is designed more especially as an improvement over furnaces of theY character mentioned, provided with grates having twyer blocks adapted for discharging air up through the fuel at intersecting angles, as exemplified in Patents 1,100,125 June 16, 1911i, and 1,111,059 September 22, 1914, issued to John H. Dietz.

It has been found that the twyer block grates mentioned, operate with great efflciency but that ashes soon accumulate and thereby diminish such efficiency. As heretofore constructed such grates have lacked means for effectively dislodging ashes and clinkers, except by the use of firing tools, and such use necessitates an undesirable disturbance of the bed of fuel. The specific object of this invention is to produce a grate of the type identified, susceptible of being rocked to crush small clinlers and to dislodge the same and ashes without disturbing the bed of fuel and thereby impairing the efficiency of operation. 1

A further object is to produce an inclined head plate, whereby it is possible to provide and maintain a fuel bed of substantially level surface so that the attendant canreadily dump any dead portion of the fire bed and take steps to rectify lthe trouble' by means of firing tools, if the rocking of the grate fails to accomplish such purpose.

lith the objects named in view, the invention consists in certain novel and peculiar features of construction and'combinations of parts as hereinafter described and claimed, and in order that it may be fully understood reference is to be had to the accompanying drawings, in which:

Figure' 1, represents a fragmentary plan view of a grate embodying my invention, a

.number of the twyer blocks being omitted to disclose parts otherwise hidden in said figure. y

Fig. 2, is an enlargedsection on the line II-II of Fig. 1. 'i I"Fig: 3, is a section on the line III-III of fig..

Fig. il, is a fragmentary perspective view of one of the twyer block carrying rocker bars of the grate.

Fig. 5, is a detailed perspective View of one of the twyer blocks.

Fig.l 6, is a section onthe line VI-VI of Fig. 1.

In the said drawings l indicates the combustion chamber of the furnace and 2 the front wall thereof. Y 3 is an angle bar bolted to the front wall and extending transversely of and within the combustion chamber. Arranged centrally of and extending longitudinally through said chamber isf a division bar 4 of inverted channel construction, one end of the bar being set in the back Wall of the furnace and the front end provided with a. recess 5 receiving the horizontal arm of angle bar 3which Vis thus utilized to sustain the front end of said division bar, one of the bolts G for'securing the angle bar to plate 2 also .extending through the front end of the channel bar to prevent lateral movement thereof. At its frontend the channel bar is of increased depth, its upper surface inclining upwardly and forwardly as at 7, from the upper surface of the remainder of the bar, and said channel bar is provided in its side walls with circular journal openings 8, for a purpose which hereinafter appears.

Paralleling the division or channel 4 and arranged adjacent theside Walls of the chamber are the sidel bars 9 of thevgrate, the rear ends of said bars being supported by embedment in the rear Wall of the chamber, and their front ends being provided with recesses 10 receiving the horizontal arm of angle bar 3, and to secure the front ends of said side bars against lateral movement, they are provided with inwardly projecting perforated ears or lugs 11, through which they are bolted as at 12 tov the angle bar 3.

'I he front ends of the bars 9 are of increased depth to correspond with the increase in depth of the division bar l, and their upper surfaces are likewise pitched or inclined as at 18, in a plane parallel vwith but lower than the inclined upper' surface 7 of said division bar. rllhe side bars 9 are also provided in their upper edges with journal recesses or openings 14s, each of which is transversely alined with one of the journal openings of the division bar.

Arranged side by side and filling the spaces between the channel bar and the side bars for the full length of the horizontal upper surfaces thereof and extending trans versely, are rocker bars 15, each provided with a series of circular openings 1G., so formed that the walls of their lower por tions are substantially vertical and the walls -of their upper portions are tapered 'upwardly. The bars are also provided with longitudinal ribs 17 which extend transversely of the furnace chamber and are c isposed diametrically with respect to the opening-s 16, and said ribs between the said openings are stiffened by integrally form-ed webs or flanges 1S. Each rocker bar is provided with end trunnions 19, the inner ones being journaled in openings 8 of the division bar and the outer ones in the j ournaled recesses or openings 1e of the side bars. Each rocker bar is also providedFpreferably at its inner end as shown-with a depending arm 20, and all of the arms 2O at the same side of thc division bar d are pivotally connected toa longitudinally extending link 21., which link is provided with a depending lug 22 through which extends a rod 23, whereby the rocker bars are operated. The rods 23 are provided with nuts 24k to retain washers 25 against the ends of said lugs 20, the faces of the washers in engagem-ent with the lugs being of convex form to accommodate the up and down movement of the lugs, which is incidental to the rocking of the-bars 15, as will be readily noted by reference to Fig. 2.

26 are grate sections filling the spaces between rocker bars and the front wall of the furnace, and said sections are provided with depending end flanges 27, provided with out wardly projecting trunnions 28, for engagement with the journal openings 8 in the front end of the journal bar, and the journaled recesses or openings l-l in the inclined edges or surfaces 13 of the side bars.

.The parts are so proportioned that the front edges of the sections 26 occupy a plane above the inclined edges of the side bars 1S and flush with the corresponding surface 7 of the division bar, and to support said sections 26 in an inclined position with their upper surfaces occupying the planes mentioned, they are provided with depending arms 29 pivotally connected to supporting rods 30, which extend slidingly through the front wall Q and are adapted to be connecte/5 with suitable means for effecting longitudinal or sliding action of said rods, whereby to effect swinging movement of said sections on trunnions 2O. lVhen either rod 30 drawn forward, the corresponding or connected section sG swings downwardly at its rear end to provide an opening` between it and the adjacent rocker bar, through which ashes or clinkers may be diunped, as will be readily understood by reference to Fig 2.

To prevent ashes or clinkers obtaining access to the journal recesses or openings 14 of the side bars, obtuse angle-shaped covering` strips 31 are placed upon the side bars, and the upper edges of said strips are preferably inclined downwardly and inwardly, as shown in Fig. 8, and interposed between the side bars and their covering strips and the side walls of the furnace strips of asbestos or equivalent material, these strips being einployed chiefly to accommodate relative change of position of said side bars and side walls, due to expansion and contraction thereof, without disturbing the air tight relation formed by said asbestos or filling strips 32.

To close the spaces between the rear-mos rocker bars and the rear wall of the furnace, l employ transverse angle bars 33, secured preferably at their ends to the division lar and the side bars, the inner edges of the angle bars 33 being beveled downwardly and rearwardly so that they may be pushed close to the. said rocker bars without interfering with the rocker action thereof.

The rear portions of the pivoted sections 26 are preferably provided with transverse series of openings 34, corresponding in all respects to the openings 15 of the rocker bars, and forward of said openings 311 the said sections are preferably provided with elongated openings or slots 35, t is prcferred to employ the openings 35 because at this point the bed of fuel will. be thin or shallow, and it has been found in practice that the use of twyer blocks. where the fuel bed is very thin, have a tendency to fuse. it being understood that the level of the bed of fuel upon the grate will correspond approximately with the plane of the highest point of the sections 26, so that the attendant may look through the furnace door and have the entire surface of the bed of fuel under observation.

The twyer blocks preferably comprise upper frustunrshaped portions 3G and cyliuH drical body portions 37, depending from portions 3G. The diameter of portions 36 is slightly less than the largest diameter of the openings 15, and the walls of portions 36 taper downwardly more sharply than the tapering portions of said openings 16, so that when the twyer blocks occupy the openings the spaces between their tapered walls lili . ings, the chief function of the latter being to thereby dislodges the accumulation of ashes guard against tilting' or rocking movement of the twyer blocks in said openings when the rocker bars are operated through the instrumentality of rod 23, and to additionally support and guard against movement of the twyer blocks they are provided with radial slots 40, for the reception of the ribs 17 of the rocker bars,.as shown clearly in Figs. 2 and 3.

In operation the air is forced by a blower, not shown, or otherwise, to the underside of the grate, and thence passes up through the constricted circular passages formed by and between the openings 16 and the twyer blocks, and the narrow cracks or openings between the rocker bars and the fact that the air is under pressure and the passages and openings are small, insures a uniform distribution of air up into the entire bed of fuel, regardless of the depth or thickness of the latter, a characteristic pointed out in Patent 1,100,125, hereinbefore identified.

'When the attendant notes that the furnace is not operating with maximum efficiency, he may inspect the bed of fuel, and if he decides the lack of proper combustion is due to obstruction of the air passages by ashes or cinders, he rocks the grate and and crushes and dislodges any small clinkers which may have formed.

In the event the trouble is confined to a particular point discernible to the atte-ndant, he may use a firing tool to clear the grate of the obstruction. If the trouble is due to large 'clinkers which he is unable to dislodge by shaking, he will lower the dumping sections, one at a time, of course, to avoid disturbing the entire bed of fuel and with a proper firing tool rake the clinkers forward until they fall into the ash pit, after which the dumping section is relevated and the fuel releveled over the grato. Of course, only one side of the grate is raked at a time, as it is desirable to avoid disturbing the bed of fuel on both sides of the grate at once.

From the above description it will be apparent that I have produced a grate cnibodying the features of advantage enumerated as desirable and which is obviously1 susceptible of modification in minor v*particulars without departing from the principle of construction involved or from the scope of the appended claims.

I claim:

1. In a grate the combination of a series of transverse juxtaposed rocker bars provided with openings and twyer blocks fi ting in said openings and in conjunction with the edges of the grate producing air passages through the rocker bars, and a transversely extending dumping section located'forward of said rocker bars and sloping upwardly and forwardly with respect to said rocker bars, and pivotally supported with its axis of pivotal movement paralleling the axes of pivotal movement of the rocker bars and disposed forward ofthe latter, and independent means for operating the rocker bars and said dumping section, extending forwardly and accessible forward of the grate.V

2. A grate, comprising a pair of parallel longitudinally extending side bars,a longitudinal division bar disposed centrally between said side bars, means for supporting and holding said bars in fixed relation; said bars being formed with upwardly and forwardly inclined surfaces at their front ends, transversely alined dumping sections respectively pivoted near their front edges to the said division bar and the side bars, means for supporting said sections with their upper surfaces inclined to correspond with the inclined upper surfaces of said bars, and a plurality of transverse rocker bars between the division bar and the side bars and filling the space from the lower or rear edges of said dumping sections to the rear end of the furnace.

3. A grate, comprising a pair of parallel longitudinally extending side bars, a longitudinal division bar disposed centrally between said side bars, means for supporting and holding said bars in fixed relation; said bars being formed wardly inclined surfaces at their front ends, transversely alined dumping sections Vrespectively pivoted near their front edges to the said division bar and the side bars, means ICC,

with upwardly and for- Y for supporting said sections with their upper surfaces inclined to correspond with the -inclined upper surfaces of said bars, a plulrality of transverse rocker bars between the division bar and the side barsand filling the space from the lower or rear edges of said dumping sections to the rear end of the furnace, and means connected toeach set of rocker bars whereby the same may be operated.

4. A grate, comprising an inverted horizontal channeled bar extending longitudinally and having its surface inclined upwardly and forwardly from a point near the front end ofthe bar, `a pair of side barsl at opposite sides of and parallel with the division bar, and having their upper surfaces faces inclined to correspond with the inclined upper surface of the channeled bar and substantially flush with said surface, and means for locking each set of rocker bars.

5. A grate, comprising an inverted horizontal channeled bar extending longitudinally and having its surface inclined upn wardly and forwardly from a point near the front end of the bar, a pair of side bars at opposite sides of and parallel with the division bar, and having their upper surfaces inclined upwardly and forwardly from a point approximately transversely alined with the point from which the inclined surface of the channeled bar starts upward, a series of transverse rocker bars arranged side by side between the channeled bar and the side bars and arranged with their upper surfaces flush with the upper horizontal surface of the channeled bar, a dumping section arranged between the channeled bar and each side bar and pivoted thereto near its front end, means for normally supporting said dumping sections with their upper surfaces inclined to correspond with the in- Copies of this patent may be obtained for ve cents clined upper surfaces of the channeled bar 40 and substantially flush with said surface, means for rocking each set of rocker bars, transverse bars interposed between the rearmost rocher bars and the rear wall of the furnace and arranged with their upper surfaces flush with the corresponding surfaces of said rocker bars, and compressible lireproof material interposed between the said side bars and the sides of the furnace.

6. In a grate, the combination of an inverted channeled division bar provided with a series of openings, a pair of side bars paralleling and at opposite sides of the division bar, transverse rocker bars between and pivoted at their opposite ends to the channeled bar and to said side bars and provided each with a series of openings, a pair of dumping sections extending upwardly and forwardly from the foremost of said sets of rocker bars and pivoted at their adjacent ends in the channeled bar and at their opposite ends in said side bars, and provided with openings, twyer blocks tting in the said openings of the channeled bar,A the rocker bars and certain of the openings of said dumping sections, and coperating with said openings to form upwardly flaring air passages, means to rock said sets of rocker bars independently of each other, and means to swing the dumping sections downwardly and forwardly at their rear ends.

In testimony whereof, l afx my signature, in the presence of two witnesses.

WILLAM JOHN MANHIRE.

lVitnesses:

R. Gr. Nason, R. T. ALEXANDER.

each, by addressing the Commissioner of Patents,

Washington, D. C.

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