US2756701A - Soaking pit coping - Google Patents

Description

July 3l,v 1956 L. H. HosBElN SOAKING PIT COPING 4 Sheets-Sheet l.

Filed Nov. 17, 1952 4 Sheets-Sheet 2 Filed NOV. 17, 1952 July 31, 1956 L H. HosBElN SOAKING PIT COPING Filed Nov. 17, 1952 July 31, 1956 L. H. HosBElN 2,756,701

soAxING PIT comm Filed NOV. 17, 1952 4 Sheets-Sheet 4 fru/enf louis E Hoen/ nited States Patent soAKrNG rrr coPiNG Louis H. Hosbein, Glencoe, Ill., assigner to M. H. Detrick Company, Chicago, lill., a corporation of Delaware Application November 17, 1952, Serial No. 329,984

9 Claims. (Cl. 11G-181) My invention relates to soaking pits, and more particularly to the copings of soaking pit walls.

In a soaking pit the coping provided on the walls thereof is frequently damaged in placing the soaking pit covers in position and in yremoving these covers. Also the steel products that are to be inserted into the soaking pit for heating are lowered into and removed from the pit through the top thereof that is closed by means of this cover. In the placing and removal of the steel in the soaking pit it is also frequently accidentally engaged with the coping at the upper ends of the walls of the pit and thus this coping is frequently damaged.

In order to provide a seal between the cover and the walls the coping is provided with loose material, into which a depending flange or similar formation on the cover engages. Copings forsoaking pit walls are at:- cordingly provided with a channel or depressed portion in which this loose material is placed for providing the seal. As the handling of the material that is placed in and removed from the soaking pit and the cover in its placement and removal from the pit frequently engages the wall portions that form the sides of this depression or channel in which the sand is located, and causes the ordinary tiles or bricks used for forming these upstanding side walls of the coping to be displaced or broken and portions thereof knocked out of position, the sand or similar loose material that is utilized for providing the seal is caused to run out of the channel or ldepression provided therefor, resulting in the breaking of the seal. The breaking of the seal causes the escape of heat, which damages various mechanical parts that are used in handling the cover and the structure of the cover itself.

It is the principal purpose of my invention to provide a coping for a soaking pit wall that is so constructed and arranged that the tiles or refractories that form the side walls of the channel or depression in which the sand or other similar sealing material is placed, are held in position in such a manner as not to be readily dislodged or moved out of their normal position.

More specifically it is a purpose of my invention to provide a coping for a soaking pit wall that is made up of marginal refractory members that form the side Walls of the channel or recess in which the sand is placed and serve to confine the same, and refractory members located between said marginal refractory members that form the bottom of the channel or groove that are shorter than said marginal members, all said refractory members being vertically elongated.

It is a further specific purpose of my invention to pro vide a coping made up of refractory members of the above mentioned character that are interlocked in such a manner that accidental engagement with the marginal wall forming members will not displace the same and so that these will be held in a truly vertical position. This is accomplished by providing tiles or refractory blocks that are anged, having laterally extending enlargements or flanges thereon that interengage so that the refractory v.members that form the mid-portion of the coping provid- 2,756,70l Patented July 31, 1955 ICC ing the bottom of the channel will serve to hold the refractory members that form the marginal or upstanding ange portions of the channel in position.

Preferably the refractory members are substantially I-shaped in horizontal cross section both in the portion of the coping that forms the bottom of the channel for the sand or similar loose material and in the portions that form the upstanding side walls of the channel. Also preferably the anged or I-shaped in cross section refractory members that are shorter and form the bottom of the channel are arranged in rows extending transversely of the coping and the refractory. members of similar cross section in the marginal portion of the coping are interlocked with the shorter refractory members of adjacent transverse rows so as to hold said marginal refractories in position. In order that the inner and outer faces of the opstanding marginal Wall portions of the coping are flat faced, interlocked with said I-shaped in cross section refractory members in said marginal portions are refractory members that alternate therewith and are provided with only one lateral projection or flange on each side thereof, thus being substantially T-shaped in cross section. These T-shaped in cross section refractories are arranged so .that the laterally enlarged end portions thereof are in adjacency'and are confined between the lateral projections or flanges on the I-shaped in cross section marginal refractories. As a result, all of the refractories are so inter locked that they are held in their normal position and are not readily displaced from such position.

It is a further purpose of my invention to provide a coping of the above mentioned character in which all of the refractories are readily removable by sliding the same out of position in a vertical direction, and are similarly readily replaceable by sliding a. duplicate refractory into the position from which a damaged refractory may have been removed. All of the refractories that are I-shaped in cross section are individually removable, and in one form of my invention all of the refractories of my improved coping are individually removable, this greatly facilitating the repair of any damaged refractory, should this be necessary. By the use of my interlocking construction one of the frequent causes of damage to previously used copings has been avoided where a member channel-shaped in cross section was provided that formed the coping, said channel shaped members usually having a rather thin connecting wall forming the bottom of the channel and connecting the upstanding side walls. In such constructions the pressure exerted by the cover on the tiles forming the channel frequently split these bricks or tiles, causing the trough to spread apart so that the upstanding side walls thereof would be moved out of normal position. By my interlocking construction, this difficulty is entirely avoided.

Other objects and advantages of my invention will appear as the description of the drawings proceeds. I desire to have it understood, however, that I do not intend to limit my invention to the details shown or described, eX- cept as defined in the claims.

In the drawings:

Fig. 1 is a vertical sectional view, partly broken away, of a portion of a soaking pit, showing a cover applied thereto and showing my improved coping on the walls thereof.

Fig. 2 is a diagrammatic top plan view, partly broken away, of a soaking pit, fragmentary portions of the covers being shown therein.

Fig. 3 is a fragmentary horizontal sectional view through my 'improved coping at a corner portion of the soaking pit, the section being taken on a plane corresponding substantially to the line 3 3 of Fig. 1.

Fig. 4 is .a view similar to Fig. 3, of the coping provided on the wall between two chambers of a pit and a portion of the adjoining marginal Wall, the section being taken on a plane corresponding substantially to the line 4 4 of Fig. l.

Fig. 5 is a view partly in section and partly in elevation, taken substantially on the line 5 5 of Fig. 3, but showing one transverse row of refractory tiles in elevation, the row through portions of which the section line passes being omitted for the sake of clearness.

Fig. 6 is a view similar to Fig. 5, taken substantially on the line 6 6 of Fig. 4.

Fig. 7 is a fragmentary perspective view of a portion of a soaking pit wall and the coping thereon.

U Fig. 8 is a perspective view of a tile that may be used 1n the coping.

Fig. 9 is a section taken on the line 9 9 of Fig. 3, showing a metallic angle member mounted in said coping in elevation, the soaking pit wall below said coping being broken away.

Fig. l() is a section similar to Fig. 9, taken on the line 1(1 10 of Fig. 4, and

Fig. ll is a fragmentary View, partly in section and partly in elevation, taken on the line 11 11 of Fig. 9.

Referring in detail to the drawings, in Fig. 2 is shown a soaking pit that has a pair of end walls 12, a pair of side walls 13 and a dividing wall 14 to provide a pair of chambers 15 in said soaking pit. The coping on the walls 12 and 13 is shown as comprising an outer marginal portion 16 and an inner marginal portion 17 and the dividing wall or partition 14 with marginal portions 18. The marginal portions 16, 17 and 18 are taller than the intermediate portions of said coping to thus provide a troughlike structure at the top of each wall, which is filled with loose material 19 in the manner illustrated in Fig. 1, said loose material being preferably sand. The portion of the coping between the marginal portions 16, 17 and 18 on the walls 12, 13 and 14 forms the bottom wall of the trough.

The cover is shown diagrammatically at 21 in Fig. 2 and as shown in Fig. 1 said cover comprises a body portion which is made of refractory material, the details of structure of which are not part of this invention, but which is mounted on a framework comprising frame members 22 and other framing, portions of which areshown in Fig. 1, but which are not material to the present invention. Suitable means is provided for heating the contents of the soaking pit, that is, of the chambers 15 between the walls 12, 13 and 14. Each of said cover members is provided with suitable sealing means for retaining the heat within the chambers 15, said sealing means comprising depending iianges at the opposite sides and ends of each of said cover members 21. Preferably, the sealing means comprises a depending metallic member 23 secured to the metal framework of the cover in a suitable manner, and an outer covering 24 of refractory material, said sealing members having a tapering bottom edge 25 that seats in the sand or similar loose material 19 when the cover 21- is in place to seal the chamber 15, over which the cover 21 is placed.

In view of the fact that the cover members 21 are very large and heavy and have to be handled by mechanical means to be placed in position and removed from position on the soaking pit walls, it is of frequent occurrence that the depending anges accidentally engage with the marginal portions of the coping, which, in the ordinary construction thereof prior to my invention, frequently caused refractories that were used for forming the marginal walls of the trough-like coping to be knocked out of place or broken off, resulting in the sand or other loose material 19 running out of the trough and breaking the seal between the depending sealing anges on the cover members and the soaking pit chamber over which the cover member is placed, Also, due to the great weight of the soaking pit covers and the wedging action exerted by the tapering lower end portions 25 of the sealing members, troughshaped tiles that have been used for soaking pit copings are frequently split in the relatively thin connecting wall thereof forming the bottom wall of the trough-like channel in the coping and after such splitting has taken place the wedging action of the cover tends to force such damaged tiles out of position, also thereby causing the sand or other loose material 19 to run out of the trough and breaking the seal, as above mentioned.

My improved coping for soaking pit walls is made up of a plurality of interlocking refractory members that extend in such a manner that the same are elongated in a vertical direction. Said refractory members comprise relatively long marginal refractory members 26 and shorter refractory members 27 that lie between the margins of the copings, certain thereof extending partly into said marginal portions, as will be described below.

The marginal refractory members 26 and the intermediate refractory members 27 are alike except for the length or extent thereof in a vertical direction. The marginal refractory members 26 are substantially I-shaped in horizontal section, having laterally projecting flanges 28 at opposite ends thereof and having a connecting portion 29 between the enlarged ends that form the flanges 28, the portion 29 being substantially the web portion of the I-beam-like cross section of the refractories 26. The flanges 28 are of a thickness such that a pair thereof would loosely occupy the space 30 provided between the lateral flanges on each side of another of the same shape refractories. The lateral enlargements or flanges 2S are connected with the side faces of the web portion 29 by means of inclined wall portions 31.

The refractory members 27 are of the same cross sectional shape as the refractory members 26, but in order to clarify the description of the construction of the coping and the interlocking relationship of the refractories 26 and 27, the lateral enlargements or flanges on the refractories 27 corresponding to the lateral enlargements or flanges 28 on the refractories 26 are designated by the numeral 32, the web portions corresponding to the portions 29 of the refractories 26 are designated by the numeral 33, and the inclined walls joining the faces of the web portions 33 and the outer faces of the lateral enlargements 32 are designated by the numeral 34 on the refractories 27. The top and bottom and end faces of the refractories 26 and 27 are preferably substantially flat and extend at right angles to each other, as will be obvious from the drawings, and the outer faces of the anges or lateral enlargements 28 and 32 are flat and in transverse alignment with each other, as will also be obvious from the drawings.

Referring to Figs. 3, 4, 7 and ll, it will be noted that the flanged refractory members 26 and 27 are arranged in rows extending transversely of the coping, or transversely of the wall on which the coping is provided. Thus in Figs. 3, 5, 7, 9 and l1 is shown the coping structure on an end wall 12, and it will be obvious upon reference to these figures that the transverse rows of refractories are alternating, that is, there is a row that extends transversely of the coping that is made up of a pair of short tiles 27 and a pair of the longer tiles 26, which lie in the margins of the coping, the tiles 27 lying in the portion of the coping forming the bottom of the trough or channel therein. The flanged ends of the members 26 and 27 are adjacent each other in the row, and said rows alternate with rows of refractories staggered relative thereto and that comprise a row of three refractories 27 arranged similarly end to end in the row, but only the middle refractory thereof lies entirely in the bottom portion of the coping, the end refractories 27 of these transverse rows extending into the marginal portion of the coping, as will be obvious from Figs. 7, 9, and ll. Also in said rows alternating with the rows that have the refractories 27 and 26 therein are refractories 35 and 36. The refractories 35 and 36 are substantially half the cross section of the refractories 26 and 27, that is, instead of being I-shaped in cross section and having a pair of iianges or lateral projections at each end-i thereof, said refractories 35 and 36 only have anges or lateral projections 37 at one end thereof and are thus substantially T-shaped in cross section. However, the thickness of the portions 38 of said refractories 35 and 36 is the same as the same as that of the web portion 29 of the refractories 26 and of the web portions 33 of the refractories 27 and the lateral projections 37 are the same in size and shape as the lateral projections 28 and l32 of the refractories 26 and 27.

It will also be noted upon reference to Figs. 3, 7 and l1 that the lateral projections or flanges 32 on the refractory members 27 of one transverse row fit loosely in the recess between the iianges 32 of the members 27 of the adjacent transverse rows to thus interlock the members 27 of adjacent transverse rows against displacement lengthwise of the row. Similarly a lateral projection or fiange 2S on each of the end members 26 of alternating rows and one of the lateral projections 32 of the adjacent member 27 in the same row t in the recess between the lateral projections at opposite ends of the members 27 of the transverse rows adjacent thereto that extended into the marginal portions, thus interlocking the marginal refractory members 26 with the members 27 of the rows adjacent thereto, holding said members 26 from movement lengthwise of the row in which the same are located.

The members 35 are mounted between a pair of said i members 26 and the lateral projections 37 thereon are each mounted in a recess beween a pair of the lateral projections 28 of the member 26 along with a lateral projection 32 of a refractory member 27 that is in the same transverse row with the member 35, said projections 32 and 37 tting loosely in said recess and interlocking the member 3S with the members 26 in adjacent rows thereto, to thus hold said members 35 from movement lengthwise of the row in which the same are located. The refractory members 35 are relatively long, being of the same length as the refractory members 26, but the refractory members 36 are short, being only of a length sufficient to extend from the top face of a refractory member 27 to a top face of a refractory member 35 or 26. The refractory members 36 are also held from displacement longitudinally of the row by the refractory members 26, as a lateral projection 37 on a member 36 and a lateral projection on a refractory member 35 are seated in a recess between a pair of lateral projections 28 on a refractory member 26 so as to be loosely held between said lateral projections or flanges 26. The spaces remaining between the refractory members at their web portions and at their lateral projecting portions when the same are in inter-engagement are filled with refractory cement, which is indicated by the numeral 39, as is also true of the spaces between the ends of the refractory members that are in the same row. Also, preferably, refractory cement 39 is provided between the bottom ends of the refractory members 26, 27 and 35 and the top face of the wall on which these are mounted. i

In Fig. 8 a refractory member 40 is shown, which 'may be divided on the line indicated at 41 so as to produce two of the refractory members 36. Also, ifdesired, in'- stead of using a refractory member 35, a refractory member 40 can be used along with half of the refractory member 4t) instead of the refractory member 35, but in such case the joint between the half member 40 and the whole member that replaces the member 35 should be located in staggered relation to the joint between the refractory member 36 and the refractory 27 below the same, which would place the joint about mid-way of the height of the member 27, as will be obvious. The refractory member 40 is made of the same cross sectional shape as the members 35 and 36 and the same reference numerals are applied to the web portions andthe laterally'projecting flanges thereof as are applied to the corresponding parts of the members 35 and 36.

Preferably, a metal sheet 41 is provided on the outer face of the soaking" pit, and welded thereto at intervals along said metalr facing 41 are substantially T-shaped metal members 42 that have a pair of iianges 43 thereon that are mounted in substantially the position shown in Figs. 3, 4 and 9 engaging a pair of the lateral enlargements 28 onA the members 26 of transverse rows of refractories adjacent thereto, as will be obvious from Figs. 3 and 4. In constructing the coping, openings are left between the members 26, as shown in Fig. 7 at 20, for insertion of the anchor members 42 and after insertion thereof refractory cement or other suitable refractory material, such as the material indicated by the numeral 39, is filled between the member 27 that is adjacent the iianges 43 and said flanges and above and below said anchoring member 42 to fill the space between adjacent refractories 26, the refractories 35 being omitted at such points as are provided with the anchoring members 42.

Fig. 3 shows a corner portion of the coping at the junction of a side wall 13 and an end wall 12. In the side wall'13 the same arrangement of refractory members 26,247, 35, and 36 is provided as in the end wall 12 and the refractory members are similarly interlocked.

.Also the anchoring members 42 are provided in the same manner as previously described for securing the metal facing sheet41 and the coping to each other. However, at the corner portion of the wall the end ofthe channel between the marginal refractories is closed by means of a continuous row of refractory members.26, which.y extends transversely of the side wall 13, and between said refractories 26 and the metal facing 41 is a filling of refractory material 39, such as previously referred to. Also, to fill the spaces between the ends of refractories 27, in the rows running crosswise of the side wall 13, but ending short of the refractories 27 on the end Wall l2 adjacent said wall 13 and said refractories 27`on said wall 12 are refractories 40, which are of tbe same height as the refractories 27. The refractory filling ,material -39 isprovided between the ends of the refractories 26, 35, 27 and 40 in said corner portioniand the sides of the refractories 26 and 27 in the coping on the wall 12.

Referring to Figs. 4, 6 and l0, it will be `noted that inthe coping on the wall 14 that serves as a partition between the two compartments or chambers of the soaking pit the channel or trough is of greater width than in the copingsjon thewalls12 and 13, this being necessary duetto the fact that a pair of depending sealing flanges on the adjacent cover members 21 have to be accommodated in said trough or channel and sealed by means ofthe loose material 19 therein. This will be obvious from Figs..l and 2. Due to the slightly greater width requiredfor the channel, a slightly different arrangement of the refractory members in the row is proi vided in the yportion of the coping that overlies the wall 14.

Thus in Fig. 4 the portion of the coping that overlies the wall 13 is ,the same as previously described, but in the portion ofthe coping overlying the wall 14 shown in Fig.`4, which is also shown in Figs. 6 and l0, the arrangement yof, said refractory members is slightly different.` There is no difference whatsoever in themanner in which said refractory members intert and hold each other againstdisplacement lengthwise of the row and thus'transversely. of the coping. However, in order to provide the widerchannel or trough, instead of providing one transverse row of refractory members comprising a pair of members 27 arranged end to end in the bottom portion of the channel or trough and a'pair of members 26 in the marginal portion thereof alternating with a row that has a refractory member 27 in the middle of the channel and refractory members 27 that extend into the margin'al'portions of the coping, each of the transverse rows of refractories in the coping on the wall14 has a refractory member 26 at one'end thereof, but'said refractory members 26 are at opposite ends of adjacent rows and thus are in the opposite marginal portions of the coping. Also in each of said rows there are three refractory members 27 that lie in the bottom portion of the trough or channel and one that extends partly into the marginal portion, with a refractory member 36 yoverlying that portion of the refractory member 27 that is in the marginal portion of the coping and a refractory member 35. y Thus each of the rows of refractory members has at one end thereof a refractory member 26 and at the opposite end thereof refractory members 35 and 36, but these members 35 and 36 are at alternate ends of adjacent rows and thus lie between the members 26 in the marginal portion of the coping in the same manner as previously described and are similarly held in place.

The interlocking arrangement between the members 27 of adjacent rows and between the members 26 and 27 is the same in this portion of the coping as previously described, being accomplished by the lateral projections 32 and 28 in the manner described in connection with the other iigures of the drawings. Due to the greater width of the wall portion 14 it is necessary to provide an additional member 40 in the portion of the coping that overlies the Wall 13 that is adjacent the wall 14. Also due to the fact that the members 26, if placed in alternating arrangement with the members 35 and 36 at the junction of the walls 14 and 13, would project into the channel, the members 26 are provided, which are the same as the members 26, except that these are partly cut off at 44 so as to not project into said channel. However, the lower liange portions 28 thereof are left for engagement with the members 40 and 27 adjacent thereto, to interlock said members 26 with the members 27 adjacent thereto and the members 40 with said members 26.

It will be obvious from the above that not only is a structure provided that has great strength transversely of the coping, but one that has considerable iiexibility, in that the width of the trough or channel can be varied as may be found desirable without departing from the invention. It will further be noted that if any of the refractory members are damaged by accidental engagement therewith by any of the apparatus used in moving the cover members 21 or by means of the cover members themselves, the damaged refractory member can be individually removed and another-refractory of the same character placed in position, this being accomplished by vertical sliding of the refractories into and out of position. This is possible with all of the refractories that lie only in the marginal portion of the coping and with all of the refractories in the bottom portion thereof, except for the refractories/ 27 that extend partially into the marginal portions, which require the removal of the refractories 36 before the refractories 27 below the same can be removed.

What I claim is:

l. A grooved refractory coping for a wall comprising transverse rows of vertically elongated refractory members, including refractory members in the marginal portions of said coping and refractory members in the portion of said coping lying between said marginal portions, said last mentioned refractory members being shorter than said first mentioned refractory members, the refractory members of horizontally adjacent transverse rows being interlocked with each other against relative movement transversely of said coping.

2. A grooved refractory coping for a wall comprising transverse rows of vertically elongated refractory members, including refractory members in the marginal portions of said coping and refractory members in the portion of said coping lying between said marginal portions, said last mentioned refractory members being shorter than said rst mentioned refractory members, alternating refractory members in said marginal portions being iny8 terlocked with said shorter refractory members of horizontally adjacent transverse rows against relative movement transversely of said coping.

3. A grooved refractory coping for a wall comprising transverse rows of vertically elongated refractory members, including refractory members in the marginal portions of said coping and refractory members in the portion of said coping lying between said marginal portions, said last mentioned refractory members being shorter than said first mentioned refractory members, certain of said shorter refractory members extending into said marginal portions and alternating refractory members in said marginal portions being interlocked with said shorter refractory members of horizontally adjacent transverse rows against relative movement transversely of said coping.

4. A grooved refractory coping for a wall comprising transverse rows of vertically elongated refractory members, including refractory members in the marginal portions of said coping and refractory members in the portion of said coping lying between said marginal portions, said last mentioned refractory members being shorter than said first mentioned refractory members, alternating refractory members in said marginal portions being interlocked with said shorter refractory members of horizontally adjacent transverse rows against relative movement transversely of said coping, and refractory members in said marginal portions mounted between and interlocking with said alternating refractory members against relative movement transversely of said coplng.

5. A grooved refractory coping for a soaking pit wall comprising transverse rows of vertically elongated refractory members, including transverse rows having refractory members having vertically elongated lateral enlargements at opposite ends thereof in the marginal portions of said coping and refractory members having vertically elongated lateral enlargements at opposite ends thereof in the portion of said coping lying between said marginal portions, said last mentioned refractory members being shorter than said first mentioned refractory members, said refractories in said marginal portions being interlocked with said shorter refractory members having such lateral enlargements of horizontally adjacent transverse rows against relative movement transversely of said coping.

6. A grooved refractory coping for a soaking pit wall comprising transverse rows of vertically elongated refractory members, including transverse ro-ws having refractory members having vertically elongated lateral enlargements at opposite ends thereof in the marginal portions of said coping and refractory members having vertically elongated lateral enlargements at opposite ends thereof in the portion of said coping lying between said marginal portions, said last mentioned refractory members being shorter Vthan said first mentioned refractory members, said refractories in said marginal portions being interlocked with said shorter refractory members having such lateral enlargements of horizontally adjacent transverse rows against relative movement transversely of said coping, and refractory members in said marginal portions having lateral enlargements at only one end thereof interlocked with said first mentioned refractory members against relative movement transversely of said coping.

7. A grooved refractory coping for a soaking nit wall comprising transverse rows of vertically elongated, vertically slidably connected refractory members, including refractory members in the marginal portions of said coping and .refractory members in the portion of said coping lying between said marginal portions, said last mentioned refractory members being shorter than said first mentioned refractory members, said refractory members of horizontally adjacent rows having interengaging means thereon interlocking the refractory members of adjacent rows to hold the same against movement transversely of said wall.

8. A grooved refractory coping for a wall of a soaking pit comprising transverse rows of vertically elongated, vertically slidably connected refractory members, including refractory members in the marginal portions of said coping and refractory members in the portion of said coping lying between said marginal portions, said last mentioned refractory members being shorter than said rst mentioned refractory members, certain of said shorter refractory members extending into said marginal portions and alternating longer refractory members in said marginal portions interlocked with said shorter refractory members of horizontally adjacent transverse rows against relative movement transversely of said coping, and shorter refractory members in said marginal portions above the rst mentioned shorter refractory members in said marginal portions mounted between and interlocking with said alternating longer refractory members against relative movement transversely of said coping.

9. A grooved refractory coping for a wall of a soaking pit comprising transverse rows of vertically elongated, vertically slidably connected refractory members, including refractory members in the marginal portions of said coping and refractory members in the portion of said coping lying between said marginal portions, said last mentioned refractory members being shorter than said rst mentioned refractory members, certain of said shorter refractory members extending into said marginal portions and alternating longer refractory members in said marginal portions interlocked with said shorter refractory members of horizontally adjacent transverse rows against relative movement transversely of said coping, and longer refractory members in said marginal portions located in the ends of said transverse rows beyond said shorter refractory members mounted between and interlocking with said alternating longer refractory members against relative movement transversely of said copi ing.

References Cited in the file of this patent UNITED STATES PATENTS 189,676 Adams Apr. 17, 1877 442,060 Landis Dec. 2, 1890 650,919 Vortriede June 5, 1900 991,896 Sajo May 9, 1911 1,176,611 Smith Mar. 21, 1916 1,367,497 Pace Feb. 1, 1921 1,501,563 Lawrence July 15, 1924 1,657,453 Boyd Jan. 31, 1928 1,719,475 Jacobus July 2, 1929 2,124,888 Morton July 26, 1938 2,319,914 Blanding May 25, 1943 2,553,393 Weber May 15, 1951

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