US1265493A - Roof construction for furnaces. - Google Patents

Description

F. ORTH. ROOF CONSTRUCTION FOR FURNACES.

APPLICATION FILED APR. I8. I916.

1,265A93 Patented May 7, 1918.

2 SHEETSSHEET I.

F. ORTH.

ROOF CONSTRUCTION FOR FURNACES.

APPLICATION FILED APR 18. I916.

WITNESS.

Patented May 7,1918.

2 SHEETS-SHEET 2- jun'zz 0 2%,,

FRANK ORTH, or INnIArvA HARBOR, INDIANA.

ROOF CONSTRUCTION FOR FURNACES.

Specification of Letters Patent.

Patented May a, rare.

Application filed April 18, 1916. Serial No. 91,876.

To all whom it may concern:

Be it known that I, FRANK ORTH, a c1t1- zen of the-United States, residing at Indiana Harbor, county of Lake, and State of Indiana, have invented certain new and useful Improvements in Roof Constructions for Furnaces, of which the-following is a speclfication.

The present invention has to do with improvements in roof constructions for furnaces and also. the method of making repairs in the same. The features of the invention are very well adapted for use in connection with open hearth steel furnaces, although it will presently appear that said features are in no wise limited to this particular class of service.

In open hearth furnace practice it is found that generally the roof will burn away or become dangerously thin in certain portions sooner than in other portions, so that it becomes desirable to be able to renew those portions which burn most rapidly. Also it 1s well understood that 'in order for an arch roof to be self-sustainin with all portions of the roof material under compression, it is necessary for the so-called line of thrust to remain within the body of the roof material at all points throughout the arch.

Ordinarily the rear portion of the roof will burn away more rapidly than the front portion, or at any rate those portions of the roof opposite to the doors are generally found to burn away most rapidly.

In Letters Patent of the United States, No. 1,095,920, issued to me May 5, 1914;, for improvements in arch construction for furnaces, and also in my Letters Patent of the .United States, No. 880,910, issued to me March 3, 1908, I have discloseda type of roof construction in which there are provided transversely extending thrust ribs, the

end portions of which are suitably support-' ed against the spreading, and between which ribs are placed the arch sections of roof. In the construction shown in the said Letters Patent, No. 1,095,920, the transverse ribs have their upper faces beveled, so that a wedge-shaped space is provided between the upper portions of each pair of adjacent ribs. There are also disclosed in that Letters Patent certain replacement blocks of wedgeshaped or beveled formation adapted to be seated down between and to be supported by the said upper portions of adjacent ribs, the

said replacement blocks havin their end faces beveled to correspond wit the beveling on the upper portions of the ribs.

.When the replacement blocks are set between the beveled upper portions of the ribs disclosed in the said Letters Patent, No.

1,095,920, a wedging action occurs by reason of which wedging action there is tendency to displace the ribs laterally, thereby throwing them out of line. Consequently, when it is desired to effect a repair in a roof, by the use of wedge-shaped blocks seating down and resting solely upon the beveled faces of the upper portions of the ribs, such repair should be made in alternate sections of roof, leaving the intermediate roof sections undisturbed until the said alternate sections have been repaired, after which the intermediate roof sections may be knocked out and repaired. In this way the tendency toward the lateral displacement of the ribs may be reduced to a minimum, and the danger of cumulation of displacement at one end of the furnace may be largely obviated.

.Nevertheless, when using that type of rib be entirely eliminated.

Furthermore, where the repair blocks are supported solely by the aforementioned wedging action, they will necessarily seat down between the ribs low enough to bearfirmly against the beveled portions of the adjacent rlbs, and therefore the exact position which they will assume necessarily dc pends upon the distance between the. beveled upper portions. If the ribs are not all consecutively equi-distant from each other. or if the ribs do not lie absolutely parallel, or if the repair blocks are not all of uniform dimensions, some of the repair blocks will seat down lower than others, so that an irregular repair patch will be the result. Not only will this produce a patch which is unsightly in appearance, but it will produce the still greater disadvantage that the lower ortions of some of the repair blocks will e much more exposed to the burning action than the other repair blocks, so that the patch will not be as durable andsatisfactory as would otherwise be the case.

One of the objects of the present invention is to provide a rib construction of such form that the repair blocks mav be sun- 5 sult in the elimination of the disadvantageous side thrust on the ribs, but it will also r$ult in uniformly supporting the repair blocks, so that the patch will be uniform and regular, the lower portions of all of the repair blocks of each patch coming together in a smooth unbroken surface. This will also result in the advantage that in case the ribs are not all uniformly spaced, or in case they are not absolutely parallel to each other, or in 'casetherepair' blocks are not of uniform size, still a smooth regular patch may be produced. Consequently, it will not be necessary when practising this feature of the invention to make use of the same amount of skill in the labor as would otherwise be necessary for the production of a satisfactory patch.

Another feature of the invention has to do with the method of patching the roof. This method consists in the removal of selected burnt sections of roof and the substitution of repair blocks in said sections. More particularly this feature of the invention consists in the removal of adjacent burnt sections of roof and the substitution of the repair blocks in said sections.

Frequently, some portions of a rib will be so burned away or reduced in depth as to make it desirable to repair the same by substituting blocks of greater depth in such ortions of the ribs. Another feature of the invention has to do with the proportioning of the original blocks in such size that they may be substituted into those portions of the ribs which it is desired to repair. This will result in an economy of material and consequently in an'econom'y in the cost of making the repairs.

Other objects and uses of the invention will appear from a detailed description of the same, which consists in the features of construction and combinations of parts hereinafter described and claimed.

Referring to the drawings:

Figure 1 shows a front elevation of an open hearth furnace to which some of the features of the present invention have been applied, a portion of the roof structure being broken away and the roof at this point being shown in section'; 0

- Fig. 2 shows a cross-section on enlarged scale, taken on the line 2--2 of Fig. 1, looking in the direction of the arrows;

Fig. 3 shows a plan view of, a section of roof having applied thereto the: features of the present invention, and it shows by means of dotted lines a section of roof wherein it is desired to effect a repair, and wherein the repairs have been made by the substitution of the repair blocks;

Fig, 4 shows a longitudinal section, taken on the line 4-4 of'Fig. 3, looking in the direction of the arrows; and

Fig. 5 shows in detaiLa modified form of rib and repair block embodying certain of the features of the present invention.

Referring to the several figures, the roof is provided with a plurality of transversely extending arched ribs 6, the end portions of which are supported by buck stays 7, tie rods 8, channels 9, etc., in the manner set forth in the aforementioned Letters Patent of the United States. Any other suitable means for supporting the end portions of the ribs-may be adopted without departing from the spirit of the present invention.

Referring particularly to Figs. 3 and 4, the intermediate roof sections 10 are set in between the lower portions ofthe ribs and are supported by them. These intermediate roof sections set between the lower portions of the ribs, engagin the side faces of the blocks 11, to which blocks they may be cemented if desired. These original roof sections comprise the individual blocks 11, which, when new, form the lower surface of the roof at'the point shown by the dotted line 12 of Fig. 4, or the full line 12 of Fig. 2. After a perlod of operation the roof will have burned away on a somewhat irregular surface to the line 13 of Fig. 4. The extent of. this burning will be irregular in different portions of the roof, and as shown by the dotted line in Fig. 2 will generally be greater at the back side 14 of the roof than at its front side 15.

After the roof or any portion of the same has become so thin as to make it desirable to effect a repair, the burnt blocks 11 will be removed and the repair blocks substituted. In Fig, 3 I have shown by the dotted lines 16 a section or portion of roof within which it is desired to-make a patch. This section of roof' comprises portions of roof lying within the spans A, B and C, the patch illustrated not extending into the spans D and E.

In order to place the patch in the burnt section of each span, the burnt blocks 11 are moved from the desired section and the repair blocks 17 are substituted. As shown in the several figures, each of the ribs is provided on each side with a transverse shoulder 18, said shoulder extending lengthwise of the rib, preferably at a point some distance below its upper edge 19. The upper portion 20 of the rib may be beveledor tapered according to the disclosure of Figs.

illustrated said supports take the form of the longitudinal shoulders 18. Each of the re pair blocks 17 is provided with a lug or lip 21 adapted to seat squarely onto'the shoulder shall be supported by the shoulders or other supporting means.

Frequently, the repair blocks will be of somewhat larger size than the original roof blocks, although manifestly there is no necessity for using such a relationship. However, in the several figures I have shown an arrangement in which there are originall three lines of original blocks between eac pair ofribs, and in which the repair blocks are of such size that two of them will fully occupy the space between the ribs when the repair is made.

It will also be observed from examination particularly of Fig. 4 that each of the original blocks 11 is of the same width as the width of the ribs. There is no necessity that this ratio or relationship should be maintained, but when .it is adopted the repair blocks may be conveniently built into new ribs or patches of ribs when desired Without changing the size of the blocks so substituted.

adopted and the patches may In proceeding to efl'ect the repair, the section of roof wherein the patch is to be made is first selected. If the ribs and repair blocks embodying the features herein disclosed are to be used, all of the roof sections may be removed from the portion ofroof wherein the patch is to be made before commencing the substitution of the repair blocks. In this case several adjacent or consecutive spans may be operated upon simultaneously, and in Fig. 3 I have shown patches as having been simultaneously inserted in the spans A, B and C. That is to say, the patches in all of said spans may be made at the same time and not alternately. On the other hand, if desired, the alternate patching may be e inserted first in the alternate spans and afterward in the intermediate spans. Therefore, as far as the method of repair is concerned, I contemplate the use broadly of the method which consists in first removing the desired portions of roof and thereafter inserting the patches.

Examination articularly of Fig. 4 will show that in t e arrangement illustrated just described so as to allow a slight clear with the side thrust members, of a series of ance between the side faces of the replacement blocks and the ribs when the blocks are first inserted, the said blocks will be enabled to expand the necessary amount as their temperature rises without bringing 35 inkto play an undesirable side thrust on the r1 s.

I claim:

1. In a heating furnace, the combination transverse ribs spanning the width of the furnace and having their ends resting against the thrust members and supported thereby, the ribs arching over the body of the furnace, each rib being provided with a longitudinal horizontal shoulder on each side and near its upper portion, the side faces of the ribs below said shoulders being vertical, and a series of replacement blocks between consecutive ribs and supported thereby, each replacement block being provided in its upper portion with a horizontal shoulder adapted to seat directly on the rib shoulder and be fully supported thereby, and the side face of the block below said shoulder being horizontal and resting squarely on the shoulder of the rib, substantially as and for the purpose specified.

2. In a heating furnace, the combination with the side thrust members, of a series of arched transverse ribs spanning the width of the furnace and having their ends resting against the thrust members and supported thereby, the facing sides of adjoining ribs being provided with longitudinal horizontal shoulders in their upper portions, the side faces of the ribs below said shoulders being vertical, and a series of replacement blocks between said ribs, each replacement block having in its upper portion a ing provided along its upper side face with a horizontal shoulder, and the side face beto thereby eliminate any tendency toward low said shoulder being vertical, of a series creation of side thrust on the ribs by the 10 of replacement blocks between a pair of presence of the blocks, substantially as desaid ribs and supported thereby, each of scribed.

said blocks having in its upper portion a FRANK ORTH. I horizontal shoulder adapted to rest squarely Witnesses: on the rib shoulder, and the lower portion THoMAs A. BANNING, Jr.,

of the side face of the block being vertical. FRsNcEs M. Fnoscu.

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