US518714A - Grate - Google Patents

Description

(No- Model.)

T. CRANEY.

GRATE.

No. 518,714. Patented Apr. 24, 1894.

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UNITED STATES PATENT OFFICE.

THOMAS CRANEY, OF BAY CITY, MICHIGAN.

GRATE.

SPECIFICATION forming part of Letters Patent N0. 518,714, dated April 24, 1894.

Application filed January 29, 1894. Serial No. 498,409- (No model.)

To a/ZZ whom it may concern:

Be it known that I, THOMAS GRANEY, a citizen of the United States, residing at Bay City, in the county of Bay and State of Michigan,

` have inventedcertain new and useful Im- .is fed into the furnace at such points as to give the best eects in combustion. Further in the construction of thegrate bars in connection with a hollow bridge or cross-bar at the rearend of the furnace, having apertures in its rear face adapted to supply air for combustion in rear of the grate. Further in the construction of the side grate bars having raised chambers, with perforated rear walls to supply air in the corners wherein the fire is usually slow or dead. Further in the pe culiar construction, arrangement and combin-ation of the various parts.

In the drawings, Figure l is a plan view of a grate embodying my invention. Fig. 2 is a vertical, central section thereof. Fig. 3 is a detached perspective view of one of the middle grate bars. Fig. 4 is a plan view of a grate bar showing the hollow bridge removed. Fig. 5 is a longitudinal section through one of the end grate bars.

A represents the steam generator and B its setting, provided with the usual air and fuel supply doors at the front and with the bridge Wall C at the rear end of the grate.

D is a series of fiat grate bars provided with the apertures E and provided on the under side with a rib or web F forming a truss for the central portion of the bar. At the rear end each bar is provided with a hollow passage G leading into a chamberH ina hollow cross-bar or bridge. This cross-bar I may form integral with the grate bars, as shown in Fig. 3, but I prefer to make it detachable,

as shown in Fig. 2, in which case I form a flange I, around each of the passage ways G, and form the bridge in sections, onefor each grate bar, adapted to iit over the same. The

`bridge thus formed consists of the curved xfront wall a and the inclined rear wallb provided with the inclined apertures c to direct the current of air upwardinto the line of the products of combustion and toward the bottom of the boiler. The side grate bars I provide at the rear end with section of the bridge andat the forward end with the raised air supply chamber J, formed by the inclined rear wall K and the straight front wall K supplying air in the corners above the level of the grate, so as to give as good combustion in the corners which are usually dead spaces as in the center or other parts of the grate.

What I claim as my invention isl. In a furnace grate, the combination of a series of apertured grate bars, having passage ways G at the rear end of each bar, of

the fianges I around such passage ways on A the bars, and the hollow bridge wall formed in sections the width of each bar and comprising the curved front wall a and the iuclined rear wall b provided with inclined apertures the lower side of the wall being open and fitting around the iianges, substantially as described.

2. In a furnace, the combination of the grate comprising the perforated grate bars, having attheirrearendsahollowraised bridge or cross-bar, having its rear face formed with a series of upwardly inclined perforations, of the side grate bar having a raised air chamber .I at their front ends consisting of the rear inclined perforated wall K and the front vertical wall K', substantially as described.

In testimony whereof I affix my signature in presence of two witnesses.

THOMAS CRANEY.

Witnesses:

M. B. ODOGHERTY; O. F. BARTHEL.

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