US356675A - aseceoft - Google Patents

Description

2 Sheets-Sheet 1..

(No Model.)

J. ASHCROFT.

PURNACE POP. STEAM BUILBRS.

Patented Jan. 25, 1887.

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ni 11 ...mM-Vl WITJV'ESSES 2 Sheets- Sheet 2.

(No Model.)

J. ASHGROFT. FURNAGE POR STEAM BOILERS.

Patented Jan. 25, 18787,

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` Nrrsn STATES Partnr trice.'

JOHN ASIOROFT, OF NEW YORK, N. Y.

FU RNACE FOR STEAM-BOILERS.

SPECIFICATION forming part of Letters Patent No. 356,675, dated January 25, 18,87.

Application iiled May Q9, 1386. Serial No. 203,625. (No model.)

To all lah-0122. it may con/cern.-

Beit known that l, JOHN Asnonoir'r, a citizen of the United Statearesiding at New York, in the county of New Yori; and State of New York, have invented certain new and useful Improvements in Furnaces for Steam-Boilers, of which the following is a specification, reference being had therein to the accompanying drawings.

My invention relates to improvements in grates for the furnaces of steam-boilers, the object of which is to utilize the heat of the fur nace for heating the water before it enters the boiler.

My invention consists of the alternate arrangement of hollow water bars with solid movable bars of the grate, said solid bars being adapted to be revolved, as will more fully appear.

My invention consists, further, in certain details of construction, which will be fully described hereinafter, and pointed out in the claim.

Figure l is a longitudinal vertical sectional view of the furnace and one of the water-bars. Fig. 2 is a horizontal sectional view of the i`urnace on the line o; c of Fig. 1. Fig. 3 isasectional end view of the same on the line y g1 of Fig. 2. Fig. l is a top or plan view ofa modification. is a horizontal sectional view, ou an enlarged scale, of the water-tubes and water boi: or back. Fig. 6 isa sectional view on the line e ofFig. 5.

Referring to drawings, A designates the side wall of the furnace; B, the bridge-wall; C, the front wall with openings D for the furnacedoors and like openings, E, to the ash-pit.

F are bearingbars, arranged at suitable dis tances apart for the support of the gratebars, said bearing-bars being provided with notches c, to receive the grate-bars and prevent them from being laterally displaced while being shaken or revolved to free the lire of clinkers or ashes.

, G are solid grate-bars supported on the bearingbars F, said bars being, by preference, of

' triangular shape in cross-section, as this form of bar is superior to all others in that it lasts longer and is easily turned in its bearings, while the angular portionsserve to cut or break the olinlrer which inayhave formed in the furnace. This forni of bar was patented to nie November 27', 1877, No. 197,5l0, and need not be more fully described in this connection.

H are hollow or water grate-bars,whieh, by preference, are made oi' heavy wrought-iron pipe or tubing, the front ends of which are closed by screw-caps Lwhile the rear ends are connected to and communicate with the hotwater chamber K of the water-back L, and by providing the hollow bars H with screw-caps I am enabled to have ready access to the interior of said bars and to the water-back, to clean the same from dirt or scales when required. These hollow bars are arranged alternately between the solid triangular bars G, and are pro vided with small open-ended tubes M, located therein, said tubes M being connected to and communicating with the cold-water chamber N of the water-back L.

Lis the water inlet and outlet chamber, lo cated in the bridgewall B of the furnace, and consists of a cast-iron rectangular, box divided into two longitudinal compartments, K and N, by the partition O. The chamber or compartment N is connected to a suitable cold-water supply tank by means of the pipe P, while the chamber K is connected to the boiler by means of the pipe R.

In Fig. 8 I have shown a modification in which the water-bars are composed of a con.- tinuous tube, S, said tube being bent at the ends of the furnace and brought back and forth between the solid grate-bars, as shown. In this case the coid water can be passed in at either end of the pipe, but preferably at the end T, and after passing through the entire length of the pipe it is discharged into the boiler through the end V.

It will be noticed that in both of the constructions shown the solid grate-bars alternate with the tubular or water bars, and that by a slight shaking or rocking of the bars the entire surface of the grate, which includes the water-bars, is kept free from elinkers and ashes, While the water in its passage through the hollow bars is heated and pumped into the boiler. The solid bars G are provided with pinion-wheels A', which mesh with each other, one of said bars being provided with an arm or lever, B", by means of which the barsG for the circulation therethrough of Water, and i can be rotated to free the grate of ashes and a series of solid bars arranged alternately clinkers. with the Water -barsf said solid bars being 15 This construction or arrangement is espeadapted to be revolved or shaken, as and for 5 eially desirable for locomotive-engines, as it the purpose set forth.

enables the fireman to keep his fires Clean with In testimonywhereof affix my signature in buftrvery little exertion. presence of two witnesses.

avin thus described In invention, what i l claim, eid desire to secure gy Letters Patent, JOHN ASHCROFT' 1o 1s- Witnesses:

In a furnace for steani-boilers, the grate YV. J. G. BEARNS, which is composed of a series of holler bars AUGUST FIsCHER.

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