US237322A - reilly - Google Patents

Description

(No Model.) Pr. REILLY Grate Bar.

10.231.322. Patented Feb. 1,188.y

turen STATES PATRICK REILLY, OF BROOKLYN, NFNV YORK.

GRATE-BAR.

SPECIFICATION forming part of Letters `Patent No. 237,322, dated February 1, 1881.

Application filed December 10, 1880.

To all whom it may concernJ Be it known that I, PATRIGK'REILLY, of Brooklyn, county of Kings, State of New York, have invented certain new and useful Improvements in Grate-Bars, of which the following is a specification.

This invention relates to that class of gratebars for furnaces which are composed of a number of cast-iron plates placed on a square or other polygonal-shaped rod.

It consists in making the plates rectangular in form, with semicircular openings at their ends,leaving sufficient metal at the corners to withstand the heat of the lire for a long time.-

The semicircular openings at the ends of the plates 4of adjacent bars form longitudinal cylindrical chambers joining the transverse airspaces between the plates, thus providing for a free and perfectly uniform circulation of air to all parts of the grate-surface, which is an even plane produced by the upper edges of the plates. Each bar is adapted to be reversed, so that both the upper and the lower edges of the plates may alternately form the grate-surface, and the bars are tted in the furnace in such a manner that worn plates maybe taken off the square rods and replaced by new ones Without removing the rods from the furnace, all of which will be fully understood by the following description of the accompanying dra-wings, forming part of this specification, in which- Figure l is a plan view of a furnace, the bars of which are composed of square rods provided with my improved plates. Fig. 2 is a .longitudinal section of the same, showing one of the bars partly in section with some of its plates in full, and one of the grate-bars in position to have the plates removed therefrom or placed thereon. Fig. 3 is a transverse section of Fig. l, and Fig. 4 is a perspective view of one of the plates, detached.

a represents the dead-plate, and b the back bearer, of the furnace. They are shown in the drawings as connected together by the side pieces, c c, but would, in ordinary circum stances, be separate, the dead-plate c being bolted to the front of the furnace of the boiler,

and theback-bearer resting on the back wall of the ash-pit, as is well understood by those skilled in the art 'to which this invention appertains. The square rods d d d2 pass through (No model.)

holes provided therefor ina downwardly-projecting an ge, a, of dead-plate c. Their rear ends rest in open slots formed in the backbearer b, and butt against the flange b. holes in the flange c and slots in the backbearer 11 are suiiciently large to allow the square bars d d cl2 to rotate therein, and the holes in flange c are further enlarged to admit of the bars being raised at their rear ends, as shown at d', Fig. 2. The parts of the square bars cl d d2 between the back-bearer b and dead-plate a are entirely covered by the rectangular plates c e, the upper edges of which form a at grate-surface. The width of the air-spaces between the plates on each of the square rods is about equal to the thickness of the plates, as is also the width of the air-spaces between the adjacent ends of each series of plates. Each series of plates with the square rod passing through their centers constitutes a grate-bar. The form ofthe plates e e is clearly shown at Fig. 4, which is a perspective view of one of them, detached. It is of even thickness throughout with the exception of the bosses e' e surrounding the square hole through its center, which corresponds to the cross-section of the square rods d el cl2, and it is cut away at its ends, forming the semicircular openings e2 e2, thus reducing its weight to a minimum, and at the same time providing for a perfect circulation of air by forming large longitudinal chambers between the adjacent series of plates when placed in the furnace, as shown at Fig. 3. The bosses e e whichdetermine the width of the air-spaces between the plates e c are made as narrow as practicable on all their sides, so as to obstruct the air in circulating between the plates as little as possible. Especiallyis this freedom of circulation necessary at the central part ofthe plates over the bosses e e.

Considerable metal is left at the corners e3 e3 of the plates by the semicircular openings e2 e2 formed in their sides, thus enabling the plates to withstand long usage before burning away sufficiently to allow the fuel to fall down between their adjacent ends. The semicircular openings e2 e2 in the sides of the plates e e also allow the corners of the plates of the adjoining bars to clear when said adjoining bars are rotated.

It will be observed that the upper and lowerI The IOC)

halves of the plates are uniform in shape, thus admitting of the bars being reversed as often as desired, by applying a wrench to the ends of the rods d d d2 projecting beyond the deadplate a. The bars are also independently shaken by this means.

By reason of the rear bearings of the bars being open slots the rear ends of the bars may be raised, as shown at d', Fig. 2, to allow old plates to `be slipped off the rear ends of the square rods and replaced by new plates, thus obviating the necessity of removing the bars from the furnace for this purpose.

Having now described my invention, I wish it understood that I do not claim, broadly, a grate-bar composed of a series of plates placed on a supporting-rod, as such is shown and described' in Letters Patent of the United Sta-tes No. 213,730, dated April 1, 1879, and No. 22l,657,dated November 1S, 1879,granted to J. Ashcroft, and No. 216,708, dated June 17, 1879, granted to F. Steele; but

What I claim, and desire to secure by Letters Patent, is

1. As an improvement in grate-bars composed of detachable plates and a central sup porting-rod, the rectangular plates e e, provided with the semicircular openings e2 e2 at their ends, and the uniformly narrow spacingbosses e e', in combination with the square rods d d d2, substantially in the manner shown and specified, that when placed in the furnace the grate-surface formed thereby is a fiat plane, and the air-spaces between the plates of each bar and between the ends of the plates of adjacent bars is of uniform width throughout, as set forth.

v 2. The grate-bars composed of the rods d d d2 and detachable plates e e, in combination with the flange a', provided with holes to support the front ends ofthe rods d d d2, and the back-bearer b, provided with open slots, substantially as and for the purpose hereinbcfore set forth.

In testimony whereof I have hereunto set my 4

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