US979661A - Furnace. - Google Patents

Description

J. R. FORTUNE.

FURNACE. APPLIOATIOH FILED 111111.12} 1910.

Patented Dec. 27, 1910.

r 2 QHEETB-BHEET 2.

JOHN R. FORTUNE, OF DETROIT, MICHIGAN.-

, summon.

Specification of Letters Patent.

Patented Dec. 27,1910.

. 1 Application filed March-12, 1910. Serial No. 548,953.

To allwhom it may concern;

Be it known that I, JOHN R. Fon'runn, a

citizen of the United States of America, re-

sidin at Detroit, in the county of Wayne and .tate of Michigan, have invented certain new 'and useful Im rovements in F urmecca-of which the following is a specificaon, reference being had therein to the accompanying drawings.

This lnvention relates to improvements in automatic stokers and more particularly to 'a grate especially adapted for burning anthracite and other of the smaller sizes of coal, and means for automatically operating the grate.

The object of the invention is to provide a cheap construction of grate formed of stationary and movable bars, said movable bars being provided with means forming a continuous movable ledge or shelf forfeeding the coal. from the hopper and each bar being provided with suitable air passages to prevent its destruction by the heat.

A further object is to provide simple and efficient means for actuating the movable bars which means is adapted to 'move certain of the bars a greater distance than others; and to provide certain other new and useful features in the construction and arrangement of. parts, all as hereinafter more fully described reference being had to the accompanying drawings in which, Figure 1 is a transverse vertical section through a furnace embodying the invention;

portion of one side 0 l the furnace; Fig. 3 is Fig. 2 is a sectional erspective detail of a a perspective view of a rock shaft for operating movable grate bars; Fig. 4 is a perspective detail of one of the fixed grate bars;

Fig. 5 is a similar view of one of the movable grate bars; and Fig. 6 is a perspective view of one of the two parts or'halves of the same.

In the drawings, a smoke consuming furnace of the usual construction is shown, comprising side wallsl adjacent to which are hoppers 2, one side of each of which is formed by an arch plate 3 for supporting the inner and outer arches 4 and 5 spanning the space between the hoppers.

6 is an ash pit above which is supported a grate bearer 7 having bearings for the usual rotatable clinker bar 8 supported within the "bearer and extending longitudinally thereof.

Two inclined grates are each composed of independent grate bars supported with their upon the flange 9 of the grate bearer. A

main vertical web 14 is stepped or formed with a series of notches in its upper edge and provided with laterally extending flanges at the upper edge of each notch or step to form a seriesof fuel supporting shelves 15. Ribs 1G, projecting laterally from each side of the web, form continuations of the flanges forming each shelf and extend beneath the shelf above to form air passages 17 through the grate beneath each shelf for cooling the same and to prevent the fuel from dropping through. In the upper end of the web 14 of each stationary ,bar is ahole 18 forminga bearing for a rock shaft 19 which extends transversely .of the bars through the open.- ings therein and is provided with a laterally extending rib 20, the opening 18 in each bar being formed with a lateral extension 21 for and allow the rock shaft to be rocked.

Each of the movable bars 11 consists of two hkeparts or halves, each part comprising a vertical web 22 which is stepped or notched lh its upper edge in a manner si1n1- lar to the fixed bars and is formed with ribs 23 extending laterally therefrom toward the similar ribs on the other web of the barv to space the webs apart and form an air space within the bar, said ribs being integral with the web at the upper edges of the steps or notches and meeting the corresponding ribs on the other half of the bar to form narrow fuel supporting ledges or shelves 24:. The ribs are each extended rearwardly from each shelf beneath the shelf above to form air passages 25 within the bar opening through the bar beneath one end of each shelf and above the opposite end of the shelf below.

The rearwardly extended portions of the ribs also prevent the fuel from falling through the grate through the open ends of said passages. The two halves of the bar may if found desirable, be secured together with the edges of the ribs 23 in contact, by

bolts or rivets 26 and the upper end of the bar, each web 22 is formed with a notch 27 in itslower edge to engage the rib 20 on the rock' shaft 19. The movable bars are '5 thus supported at their upper ends by resting upon the rock shaft 19 and each engages and slides upon' the flange 9 of the grate bearer at its lower end between two adjacent fixed bars, the edges of the ribs '16 of which 10 engage the plain out'er sidrs of the two adjacent movable bars, which bars'close' and form one side of the air passages 17 of the fixed bars. At its extreme-upper end, each half ofeach movable bar is formed with an integral plate, which plates on the halves together form a shelf 28,-with the inner edges of the plates held in contact with eachother and the outer edges'of the plates are extended laterally'beyond the sides of the 20 webs and overlap the, upper shelves 15 of the two adjacent fixed bars to meet the shelves on the adjacentrmovablebars and form a continuous shelf across the upper end of the grate. End portions 2-9,'fo'rmed f integral with the inner eud of each shelf 28 and of the same width as said shelf, extend ward by the forward and backwardmovement of the movable bars. M Preferably the movable bars are never moved rearwardly beyond the ends of the shelves 15 of the fixed. bars and'thus the sides of the air passages 17 are always closed, causing the air to pass through said passages in contact with the lower surfaces, of the shelves throughout their entire length and preventing the burning off of the forward 5'0 corners of said shelves.

being in effect, formed hollow with internal air passages 25 directing the air against the under surface of each shelf and opening through the bars at the inner ends of saidv shelves, said shelves are cooled in every position of the bars by the air passing therethrough and the projecting corners are prevented from burning off. v

I In practice it is found that it is desirable to, move those movable grate bars which are near the forward and the rear furnace walls atthe ends of the grates, a greater distance than those near the middle of the grate, so that the fuel will be given a greater impetus 5 near the walls, overcoming the frictional re- 'bars alternating with the stationary bars,

The movable bars.

sistance to the downward movement of the fuel by lts engagement with said walls. To

accomplish this in a cheap and convenient v manner, the 11b 20 on the rock shaft 19 is made of varymg w1dth, 1t being considerably 7 narrower radially of the shaft, intermediate 1'ts.'e nds than toward each end, and thus when the rock shaft 1s turned to actuate the movable bars, those bars which engage the narrower portion of the rib will not be given as great a throw as those nearer the furnace wallsv at the ends of thegrate.

The construction of grate described is cheap tomanufacture and is very efficient in burning anthracite or other small forms ofgo coal, and by making the upperrends of the l movable grates in such a waythat they form a continuous shelf or stoker for moving the fuel from the hopper, the necessity for separate means for feeding the fuel to the grate 35 bars is obviated. The-construction of the bars being such that all projecting corners are at all times cooled by air currents passing through the bars, said bars are effectually prevented from being destroyed by'theheat 0 and an ample air supply is provided throughoutthe entire area of the grates permitting the placing of the bars close together so that fine fuel will not fall through.

' Having thus. fullydescribed my invention 5 what I claim is r-' 1. In a device of the character described,

vthe combination of a hopper, inclined sta-v tionary grate bars, inclined movable grate and means carried by the upper ends of the movable bars overlapping the stationary bars and: forming a continuous shelf at the upper end of the grate movable with the movable bars.

2. In a device of the character described, theoombination of a hopper, inclined stationary grate bars supported with their upper ends beneath the hopper, inclined movable grate bars alternating with the stationary bars, and a shelf carried by the upper end of each movablehar mdvable therewith beneath the hopper and extending laterally over each adjacentstationary bar to meet the edges of the shelves on the adja-' cent movable bars, said shelves together forming a continuous stoker to receive fuel from the hopper and feed the same on to the grate bars. i

v 3. Ina device of the character descrlbed,

the combination. of a hopper, a. series; of sta-- ti'onar'y inclined grate bars each having a stepped upper surface.forming-shelves for supporting fuel, movable inclined bars between the stationary bars each havmg a stepped upper surface, a shelf on the upper end of eachmovable bar projecting laterally over the adjacent stationary bars to me'etthe shelves on the adjacentmovable bars "and form a continuous shelf across 30 the upper; endof the grate beneath the hopper, and meansfor actuating the movable bars simultaneously in the same direction.

4. In a device of the character described, the combination of a hopper, a series of stationary grate bars having stepped upper surfaces, a'series of movable grate bars alternating with the stationary bars and having stepped upper surfaces, a shelf on the upper end of each movable bar to receive fuel from the hopper and extending over the upper steps of the adjacent stationary bars, and a wall extending downwardfrom the edge of the shelf on each movable bar to the step below on said-bar and forming means for moving the fuel.

5. In an [automatic stoker, the combination with a hopper and a series of movable grate bars, of a rock shaft extending'across said se-ries'ofbarsyand laterally extending means on'the rock shaft adapted to engage and operate the bars, said means extending late ally from. one portion of the shaft to a greater distance than from other portions thereof to'give to certain of the grate bars a greater movement than to the others.

.6. In an automatic stoker, the combination with a hopper and a series of movable grate bars of a rock shaft extending transversely of said bars, and a rib on said shaft extending longitudinally thereof and pro jeoting a greater distance radially therefrom-at one portion of the shaft than at other portions thereof to engage and move said barsof the series ditferent distances when the shaft is turned.

' 7. In an autoi'natic st0ker,.the combination with a hopper and a series of movable grate bars, of a rock shaft extending trans versely of said bars, and a radial rib extending longitudinally .of said shaft and pro ect1ng radially a greater distance therefrom near each end of the shaft than inter mediate the ends thereof toengage and move said bars, and means for turning the shaft.

8. In a device of the character described, the combination of a series of stationary grate bars each having a central vertical web stepped at its upper edge and formed with ribs projecting laterally from each sideforming a series of shelves, a series of movable grate bars alternating with the stationary bars and each formed of separate parts and having parallel vertical webs having plain outer surfaces engaged by the ribs on the adjacent stationary bars and provided with meeting ribs on their adjacent surfaces forming a series of shelves and spacing the webs to form an air passage beneath each shelf opening through the That, said ribs on the stationary bars also forming air passages opening through said stationary bars beneath each shelf, means for securing. the parts of each movable bar together and means for actuating the movable bars. I

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

JOHN R. FORTUNE.

Witnesses:

LEWIS E. FLANDERS, I ANNA M. Donn.

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