US730993A - Combined grate and smoke-consuming fire-bridge. - Google Patents

Description

'PATENTED JUNE 16, 1.903.

A. WEIL. COMBINED GRATE AND SMOKE OONSUMING FIRE BRIDGE.

APPLICATION FILED NOV. 16, 1902.

H0 MODEL.

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UNITED STATES- Patented June 16, 1903.

PATENT 01mins.

ARTHUR wE L, or CHICAGO, ILLINOIS.

SPECIFICATION forming part of Letters Patent No. 730,993, dated June 16, 1903.

Application filed November 15, 1902. Serial No. 131,495. (No model.)

To all whom it may concern.-

Be it known that I, ARTHUR WEIL, a subject of the Emperor of Germany, residing at Chicago, in the countyof Cook and State of Illinois, have invented an Improvement in a Combined Grate and Smoke-Oonsumin g Fire- Bridge, of which the following is a specification.

My invention relates to that class of grates which are used in the ordinary construction of furnaces for heating boilers for the purpose of generating steam, and more particularly to furnaces which are especially intended to thoroughly consume all liberated gases, soot, smoke, particles of coal, &c., and

thereby insure complete combustion and thorough consumption of smoke.

The objects of my invention are, first, to form a grate-bar having at one end and preferably integraltherewith, a raised or upturned portion and a lower extension forming one part of the bridge-wall for the purpose of forming the bridge when the requisite number of said bars are assembled in position, and to provide on opposite sides of the bar proper recesses or grooves, so that when the I bars are assembled the grate shall have the I requisite area of draft-openings, and to provide on opposite sides of the upturned end I curved or circular grooves, the lower extension to be formed by a web and upper and lower flanges, so that when the bridge-wall is formed, as aforesaid, it will contain curved or circular air-passages permitting the introduction of heated air from the ash-pit through the fire-bridge to be discharged at a point over the fire in the fire-box; second, to provide a grate-bar which is serviceable,economical,and

of which a grate of any dimensions may be constructed by placing the requisite number of individual bars side by side to form the completed grate; third, to so construct a bar that it will be prevented thereby from warping when subjected to the intense heatof the furnace; fourth, to permit of any one of the bars to be replaced by a new one whenever one has become unserviceable by long continued use or breakage, and, fifth, to form a combined grate and bridge which in itself will be a complete and perfect smoke-consumer and which may be fitted to any furnace of the nature mentioned now existing.

- the ordinary type of furnaces as constructed for use with a water-tube boiler. Fig. 2 is an enlarged broken elevation of a portion of the grate-bar, showing the upturned end. Fig. 3 is a transverse sectional elevation taken in the plane 3 of Fig. 2, showing a number of bars placed side by side. Fig. 4 is a sectional view of a single bar, the section also being taken in plane 3 of Fig. 2. Fig. 5 is a plan view of a number of bars placed in position side by side. Fig. 6 is a plan view of a single bar; and Figs. 7 and 8 are enlarged transverse sectional-elevations taken in the planes 7 and 8, respectively, of Fig. 2, all sectional views being viewed as indicated by the various arrows.

In constructing my improved grate-bar A, I provide the bar proper on one side with recesses or grooves a and on the other side with corresponding recesses or grooves a and so position them that the grooves a on the one side of the bar occupy a position relative to the grooves a on the opposite side thereof, so that they'come at a point midway between the same, causing the grate, which is formed by the assembling of the individual bars, to be provided with staggered draft-openings which are formed by the grooves or recesses a a, and at a suitable place or places I form upon the bar a projection or spacing-lug (or more than one) If.

B is-the upturned end or head portion of said bar, having on opposite sides thereof circular or curved grooves or recesses band 12,

corresponding with the grooves a and a on the bar proper and forming when the requisite number of bars are assembled curved or circular air-passages for the purpose of-conducting heated air from the recesses on the lower extension, hereinafter referred to, and

through the bridge. V y

B is a lower extension of the bar, comprising a central web I) and on opposite sides thereof upper and lower flanges b forming recesses on opposite sides of said lower extension. The objectof this construction is. to afford an initial air-passage between ad jacent bar-sections when assembled for the introduction of heated air entering from below the grate, from which it is divided into differentcurrents and carried by the air-pas.- sages b and b, respectively,through the bridge and discharged therefrom.

By reference to the accompanying drawings it will be observed that the air-passages b and b are similarly placed relatively to each other, as the grooves or recesses a and a in the bar proper, this obviously for the purpose of more evenly distributing the air. The said grooves or recesses in the bar proper and also in the said upturned end commencing from the top of the bar gradually decrease in depth to the bottom thereof, so that when the bars are assembled the openings between the same at the bottom thereof extend the entire length of the grate-bar proper, this obviously for the purpose of permitting a sufficient quantity of air to pass through the staggered openings aforesaid,while the curved or circular grooves in the upturned end form one passage with the recesses formed by the web and flanges of the lower extension.

In constructing a grate with my improved grate-bar it is possible to have the individual bars,which1 have alread yd escribed,extend the entire length of the furnace-chamber proper; but in furnaces having an unusual length of grate-surface it is advantageous to use two or more lengths of bars, in which case only the inner or rear sections are supplied with the upturned ends, the other sections being without said upturned ends, but otherwise constructed as hereinabove described. When two or more lengths of bars are used, the adjacent ends of the same are supported on a cross-bar 0.

By forming the bars as described, with the recesses a a and b b on opposite sides thereof in a staggered position, the bar is so stiffened by the projections or faces of the bar between said openings that the bar is thereby braced, so as to better resist the warping tendency of the bar, which is one of the chief objections to the ordinary bar now in use. This improvement, together with the projection or spacing-lug a properly placed on the side of the bar near the bottom thereof, prevents absolutely any moving or warping of the bar.

It will readily be seen that by staggering the grooves a a the air-passages through the grate are so broken up and irregular in position that they permit of very fine or powdered coal being used without danger of its passing through the grate in an unconsumed state, at the same time afiording a more even and uniform distribution of air through the draftopenings to the fire above.

Another advantage of my invention over similar inventions is that it is a complete smoke-consuming apparatus and may be fitted into any furnace of the nature mentioned at the beginning of this specification without requiring the furnace to be altered in any particular. By forming on opposite sides of the upper extension B grooves in curved or circular shape, as shown in the drawings,

heated air from below the grate-bars is con= ducted through and discharged from same in such a direction and at a point to intercept the liberated gases and unconsumed smoke, soot, particles of coal, 850., to insure perfect and complete combustion before the same shall have passed from the furnace and over the bridge-wall, as it otherwise would, in an unconsumed state.

It will be understood that in forming the bridge-section as above described there will be but one recess in the lower extension of the bar on either side thereof, from which the curved grooves or recesses lead.

The upturned end of the fire-bars when assembled may form the complete'fire-bridge or only the fore part of the bridge-wall, as is shown by Fig. 1.

I prefer to construct the grate-bar with a chilled and smooth upper surface, so as to prevent the clinging or adherence of slag to same, and thus permit of the use of any quality of coal.

I prefer to construct the fire-bar, together with upturned end and lower extension, in one piece.

While I have illustrated and describedthe bridge portion or raised or upturned end as integral with the bar proper, I do not mean to be understood as limiting myself to that construction, for obviously the bridge may be constructed apart and distinct from the bar proper and either in sections or in one entire piece, so as to be operated with any kind of grate, this construction and use being contemplated by me in practice.

What I claim as my invention, and desire to secure by Letters Patent, is-

1. The combination in a grate-bar and hotair fire-bridge of a grate-bar provided with vertically-extending grooves on opposite sides of the bar, said grooves on one side being directly opposite the spaces between the corresponding grooves on the other side, a spacing-lug on said bar, a bridge-section integral with said bar provided with a lower extension, said lower extension having recesses in its opposite sides, said recesses communicating with a plurality of curved passages terminating above the grate-bar; said curved passages on one side of said bridge-section being directly opposite the spaces between the corresponding passages on the other side, substantially as described. and for the purpose specified. v

2. In agrate-bar and hot-airfire-bridge, the combination of a grate-bar provided with vertically-extending grooves on opposite sides of the bar gradually decreasing in depth from the top thereof to the bottom, said grooves on one side being directly opposite the spaces between the corresponding grooves on the other side, a spacing-lug on said bar, a bridgesection integral therewith provided with a lower extension,'said lower extension having recesses on opposite sides communicating the spaces between the corresponding grooves on the other side, substantially as described.

ARTHUR WEIL.

with a plurality of curved grooves on opposite sides of said bridge-section terminating at the top of the bridge-section; said curved grooves gradually decreasing in depth from the top of said bridge'seotion to the bottom Witnesses: thereof, said curved grooves on the one side 7 AKSEL K. BODHOLDT,

MAURICE BERKSON.

of said bridge-section being directly opposite

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