US902135A - Furnace-grate and fire-bar. - Google Patents

Description

R. CAMPBELL.

FURNACE GRATE AND FIRE'BAB. APPLIOATION I'ILEDYHOV. 13, 1905.

902, 1 3 5 Patented Oct. 27, 1908.

FIG. I.

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UNITED STATES PATENT OFFICE.

RICHARD CAMPBELL, OF LIVERPOOL, ENGLAND.

FURNACE-GRATE AND FIRE-BAR.

To all whom it may concern:

Be it known that I, RICHARD CAMPBELL, a subject of the King of Great Britain, residing at Liverpool, in the county of Lancaster, in the Kingdom of England, engineer, have invented certain new and useful Improvements in Furnace-Grates and F ire-Bars, for which application has been made in Great Britain, No. 16,608, dated the 23rd day of July, 1906.

This invention has for its object certain improvements connected with furnace grates and fire-bars.

In furnace grates which We have manufactured hitherto, the removal of the clinker and ash from the grate has been effected by rocking the bars up and down so as to shake them, this being effected by mechanism in proximity to the grate, but this necessitated the front of the furnace or the ashpit being opened every time the bars were shaken, which, in forced draft furnaces especially, was a disadvantage.

In the accompanying drawings, Figure 1 is a sectional view of a furnace showing my invention partly in section; Fig. 2 a longitudinal section through the furnace; Fig. 8 a sectional plan.

Now the present invention is designed to avoid this defect. The grate bars A are supported in any suitable manner, and are not connected together but each is free and can be shaken vertically without disturbing any of the others. Beneath the bars at their forward end, and transversely under the grate, is a hollow horizontal shaft B which issuitably journaled in bearings C and extends through the side of the furnace shell E to the outside of the furnace or boiler where it is provided with an arm or lever D. This hollow shaft B is provided with a longitudinal slot F, and inside the hollow shaft B I provide a screwed shaft G. On this screwed shaft Gr is mounted the screwed boss of a forked lever H, the arm of which projects through the longitudinal slot F in the hollow tube. The end of the screwed shaft G is furnished with a handle or lever I so that it can be rotated, and thus by rotating this handle I the forked arm H mounted on the screw, can be traversed longitudinally, the slot in the hollow shaft permitting of this. Thus by turning the screwed shaft, the forked lever can be slid along the width of the furnace grate and its arm H made to engage in a born or projection K on any Specification of Letters Patent.

Application filed November 13, 1906.

Patented Oct. 27, 1908.

Serial No. 343,275. i

one of the fire-bars. The pitch of the screw G is such that a single rotation, or two rotations, or otherwise of the handle I, will bring the forked lever out of engagement with the horn K of one fire-bar A, and into engagement with the horn on the adjacent fire-bar.

hen it is desired to clinker the furnace, the stoker turns the handle I of the screwed shaft G so as to move the forked arm II longitudinally until its fork arrives at the grate bar that requires to be moved, and engages the projection or horn. He then oscillates or turns the lever or handle D on the hollow shaft B. This turns not only the hollow shaft B, but also the forked lever II and the screwed shaft G, and as the forward end of the forked arm H engages the horn K on the grate-bar A, the said bar is moved or shaken as required. Should the grate-bar be wedged in its raised position, the stoker may force it down by again moving the handle D of the hollow shaft the other way, thus causing the forked arm to force the latter into position again. Any individual gratebar can thus be raised or lowered, or shaken up and down, by operating the hand lever at the end of the hollow shaft. Each bar however can only be shaken when the forked arm comes into engagement with the horn on each bar and therefore it is bound to have imparted to it a direct vertical push or pull. Further the shaking of the bars can be effected without opening the front of the furnace L or ash pit M. The shafts B and G Where they pass at N through the sides of the furnace or boiler, can be provided with stuffing boxes. Each shaft can be made in a single length, or in two lengths placed in line. The dotted lines in Fig. 2 show a bar in its raised position, and the full lines show the bar in its lowered position.

I declare that what I claim is 1. In a furnace-grate, the combination of a series of independent bars; a tube provided at one end with a lever by which it can be oscillated, said tube having a longitudinal slot formed therein; a screw shaft mounted within the tube; an arm mounted upon the screw shaft and projecting through the longitudinal slot in the tube; and means for turning said screw shaft so as to traverse the arm longitudinally and bring it into engagement with one or another of the gratebars.

2. In a furnace-grate, the combination of a series of independent grate-bars; a screw shaft; an outwa-rdly-projecting arm provided with a threaded boss which is mounted on the shaft, the outer end of the arm being adapted to engage a projection on the gratebars; means for turning the shaft so as to traverse the arm longitudinally; and a slotted tube surrounding the screw shaft with the arm projecting through the slot, so that by oscillating said tube it will impart an osformed upon the arm and mounted on the screw shaft; means at the outer end of the screw shaft for turning the same; and means located without the furnace for shaking or oscillating the hollow shaft.

d. In a furnace-grate the combination of a series of independent bars; an arm normally in engagement with one or another of said bars; means for shifting the arm laterally to bring it into engagement with one or another of the bars and to hold it in such relation; and means for rocking the arm, whereby the bars may be independently shaken.

In witness whereof, I have hereunto signed my name this 2d day of Nov. 1906, in the presence of two subscribing witnesses.

RICHARD CAMPBELL.

Vitnesses G. C. DYMOND, Y. S. SHILLING'roN.

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