US1129172A - Grate construction for furnaces. - Google Patents

Description

G. L. DAVIDSON. GRATE CONSTRUCTION FOR FURNACES. APPLICATION FILED AUG. 15, 1911.

LIfiQJWQm Patented Feb.23, 1915.

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CHARLES n navrnson, or NEW YORK, n. Y.

GBATE CONSTRUCTION FURNACES.

Specification of Letters'TPatent.

Patented Feb. 23,1915.

Application filed August 15, 1911. Serial No. 644,097.

To all whom itmaz concern:

Be it known that I, CHARLEs L. DAVID- soN, a citizen of the United States, residing in the city, county, and State of New York, have made a certain new and useful Invention in naces, of which the following is a specification. 7

This invention relates to grate constructions for furnaces.

The object of the invention is to provide a constructionof grate for furnaces which is simple'in structure, economical to manufacture, and wherein the grate sections may be individually removed for repair or replacement without interrupting the use and operation of the grate or furnace.

Other objects of the invention will appear more fully hereinafter.

The invention consists substantially in the construction, combination, location and relative arrangement of parts, all as will be more fully hereinafter set forth, as shown in the accompanying drawing, and finally pointed out in the appended claims.

Referring to the accompanying drawing, and to the various views and reference signs appearing thereon, Figure 1 is a view in vertical longitudinal section of a portion of a furnace grate showing the grate sections and their supporting webs in section, and a portion of the locking mechanism for locking the webs. Fig. 2 is a broken detailed View of a portion of the grate section supporting web showing the grate section engaging lugs. Fig. 3 is a detailed view in section showing the web and grate section and the manner of removing individual grate sections. F1g. 4 1s a view 1n rear elevation of a supporting web showing the manner of applying the gate sections thereto. Fig. 5 is a top plan view of the construction shown in Fig. 4. Fig. 6 is a view in section of a grate section. on the line 66, Fig. 5, looking in the direction of the arrows. Fig. 7 is a similar view on the line 7 7, Fig. 5.

I have shown, and will now describe my invention as applied to grate constructions for use in connection with automatic stokers, and particularly the type of automatic stoker knownon the market as the Honey stoker, but I wish it understood that my invention, as defined in the claims, is not tobe limited or restricted to use in connectio'nwith automatic stokers, nor to use Grate Construction for Fun.

in connection with any particular type of stoker.

In the operation of stokers and particularly stokers of the automatic type, great trouble is experienced in the cost of making repairs. The repair is required most frequently on the grate sections and their supporting webs, these parts being rapidly burned out particularly when certain grades of coal are emploved which contain high percentages of sulfur or sulfur and iron. When the grate sections or their supporting webs become burned out, it becomes necessary, in order to repair, remove or replace them, to let the fire cool down or go out entirely, thereby involving loss not only in the amount of coalconsumed in permitting the fire to cool down or to go out but also during the time the furnace is again fired to bring the boiler up to its normal workin condition. .Moreover, the service of the boiler during the time of making repairs and of cooling off the same for repair purposes is wasted, thereby increasing the expense. Ordinarily the repair of a burned out grate section or its supporting web is accomplished by removing the web from the furnace after the fire has been drawn and the grate section and web have become sulficiently cool, then unbolting the grate section from the web for the purpose of replacing I the same or the web as the case may be, then replacing the re aired web with the grate section applied thereto into the furnace, or else by substituting a new grate section and web for the burned out parts. On account of the burning out of the grate sections and webs, the metalof these parts frequently melts and forms a substantiallysolid mass of the grate section and the web, where these parts are made separately, and with the securing devices, bolts. rods or other form of connections by which the grate sections andv webs are secured together, thereby making it necessary frequently, in making repairs to these parts, to cut out the securing bolts or rods with a chisel or otherwise, thereby making the operation difficult, and frequently resulting in breakage of the web. Efforts have been made to remedy these de fects but without entire satisfaction.

.. Moreover, where individual grate sections are employed objectionable spaces between adjacent grate 1 sections are produced through which coal may sift in the operat-ion 0f the grates especially where 1 autoa matic devices are employed for operating the grate.

It is among the special purposes of my present invention to avoid the objections above noted, and to provide a construction of grate wherein the grate sections or elements are individually removable from the supporting webs therefor without removal of the web itself and without interruption of the usual and ordinary operation of the grate, thus greatly facilitating the operation of making repairs and avoiding the loss and waste incident to former methods wherein the furnace is required to be shut down during the time repairs are beingmade, while at the same time providing a grate construction which permits of the application thereof to an automatic stoker and without loss of coal due to the sifting of the same through crevices or spaces intermediate adjacent grate sections.

In carrying out my invention I provide a supporting web of comparatively limited cross-sectional area and with engaging lugs thereon upon which lugs the individual grate sections are seated or engaged, and I arrange each web at such a level or height with reference to its next adjacent web as to permit the grate sections to be individually removed therefrom by raising the same vertically sufficiently to be disengaged from the web retaining lugs, and then tilting them vertically so as to be removed from their supporting web and removed through the space between said web and the next adjacent web, being passed down beneath the grate, thus accomplishing the operation of replacing a new grate section without removal of the web from the grate and without interrupting the operation of the grate.

In the accompanying drawing I have shown a construction embodying the principles of my invention and the manner of application of the same to a construction of automatic stoker of a familiar type.

Reference numeral 10 designates the supporting webs. These are in the form of bars designed to extend transversely of the furnace chamber and, in the case of an'automatically operated grate having pintles 11, at the ends thereof, to engage a convenient support for supporting the same. By employing a web in the form of a bar as shown, the same may be made of comparatively limited cross-sectional area so as to afford ample space between adjacent webs for the grate sections when detached therefrom to be readily passed down through the space between the supporting web therefor and the next adi'acent web. Formed on the web 10, are the lugs 12, 13, which in the particular form shown, as illustrating an operative embodiment of my invention, are arranged in pairs. Associated with eachlug 12, 13, is a side rib 14. The grate sections are indicated at 15. These are in the form of plates and, if desired, maybe corrugated, as shown, upon their upper surfaces. On their under sides each grate section 15, is provided with lugs 16, forming sockets therebetween adapted to receive the lugs 1213 on the web 10, when the grate sections are placed in position on said web. In the form shown, to which, however my invention as defined in the claims, is not to be limited or restricted, each individual grate section 15, is provided with the socket lugs 16, at each end thereof respectively cooperating with the members of the pair of web lugs 1213. Associated with each of the socket lugs 16, that is, with the socket lugs at each end of a grate section, is a transversely extending flange 17. hich is designed to engage with or against the rib ll of its associated web lug 12-13 to prevent lateral horizontal play of the grate section. In the particular form shown where each grate section engages a pair of web supporting lugs 12--13, the ribs 14- are placed on the proximate surfaces of the lugs 12-43 so as to be engaged by the flanges 17 in opposite directions as clearly shown at the left hand end of Fig. 4, thereby forming an eiiicient engaging connection between the web and the individual grate sections preventing lateral or horizontal tilting of the grate sections relatively to the web, while at the same time permitting any particular grate section to be removed from a web without disturbing the others, by lifting said grate section bodily sufficiently for the web lugs 1213 to be disengaged from the plate lugs 16 and then tilting the removed or disengaged grate section and passing the same down through the space between the web from which it was removed and the next adjacent web, as clearly indicated by the arrows in Fig. 3.

By the foregoing construction and arrangement I am enabled to remove, repair and replace the grate sections individually and without interrupting the ordinary operation of the grate. I am also enabled to employ grate sections in the form of plates which, when assembled on their supporting web have their edges in close contact with each other, thereby avoiding the provision of crevices or spaces between the individual sections through which coal may sift in the operation of the grate. I am also enabled to employ comparatively short lengths of grate sections thereby reducing the cost of repairs by removing only the one or more of the grate sections which may require removal and replacement when others on the same web may not require removal or replacement.

Where the construction embodying my invention is designed for use in connection with an automatic stoker, the webs 10, may

be provided with rocker arms 20, arranged to be engaged by a rocker bar or plate 21, operated by a pitman 22, in any convenient manner or in the ordinary Way.

Having now set forth the object and nature of my invention, and a construction embodying the principles thereof, what I claim as new and useful and of my own invention, and desire to secure by Letters Patent is,

1. In a grate construction, a supporting web having engaging lugs arranged in cooperating pairs and extending upwardly from the upper edge thereof, in combination with a plurality of grate sections having corresponding sockets to receive said lugs whereby said grate sections are retained on the web without other securing devices, and so constructed that any individual grate section may be removed without removing or disturbing the remaining grate sections or removing the web from the grate.

2. In a grate structure, a bar forming a supporting web and having engaging lugs arranged in coiiperating pairs and extending upwardly from the upper edge thereof, a plurality of grate sections having cooperating sockets to receive said lugs,whereby said sections are retained on the web without other securing means, and so constructed that any individual grate section may be removed without removing or disturbing the remaining grate sections or removing said web from the grate, said lug and socket engagement serving to prevent lateral movement of the bars relatively to the web when in position for use.

3. In a grate structure, a bar forming a supporting web and having engaging lugs arranged in cooperating pairs and extending upwardly from the upper edge thereof,-

and ribs associated with said lugs, in combination with grate sections, each grate section having cooperating sockets to receive said lugs, and flanges to engage said ribs.

4:. In a grate structure, a bar forming a supporting web and having lugs arranged. in oppositely faced cooperating pairs and extending upwardly from the upper edge thereof, and ribs associated with said lugs and adjacent the proximate or opposite faces of the members of the said pairs of lugs, in combination with a plurality of grate sections, each grate section having cooperating sockets to receive said lugs and flanges to engage said ribs.

5. In a grate bar structure, a bar forming a supporting web and having pintles at its ends and engaging lugs extending up wardly from the upper edge thereof, and depending rocking arms formed integrally on said web, in combination with a plurality of grate sections having sockets to receive said lugs, so constructed that said grate bar members are individually and inde pendently removable from the web without removal of any other grate section or of the Web from the grate, and means for rocking said arms.

In testimony whereof I have hereunto set my hand in the presence of the subscribing witnesses, on this 12th day of August A. D., 1911.

CHARLES L. DAVIDSON.

Witnesses:

CLARENCE C. HUNICKE, S. E. DARBY.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

Washington, D. 0.

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