US2885976A - Patching block for furnace roof - Google Patents

Description

May 12, 1959 L fMGGlLl. ETAL PATCHING BLOCK FOR FURNACE ROOF Filed-June'a, 1957 ili/ INVENTORIS Mc 6- lA/com HND BY 141.. MooRe 74m, @zum WHQL R10/HRD .S

THE/R /Qrvueuays United States Patent -O 4PNFCILIING BLOCK FOR FURNACEROOF Lincoln A. McGill,l San .-Francisco, Calif., `and Richard Scott Moore, Coraopolis, Pa.,.assignors to Hai-bison- WalkerRefi-actories Company,.Pittsburgh, Pa., a corporation of Pennsylvania `Application Junezs, 1957, `sentirte.ftstrlfmz `s, claims. V(C1. 11o-99) Thisinventionrelates `to refractory furnaceroofs, and `more `particularly to` blocks that .are used for patching such roofs.

It is common practice .to `form the roofs `of industrial parts of metal cases surrounding the individual `bricks c tightly. Whenit is necessary to patch a furnace roof,:it is desirable to be able to replace the eroded bricks as quickly and easily as possible. In an archedroof, where hangers are not used, there is a problem of supporting thepatching bricks until the metalplatesisecured.to them have `become oxidized and `bonded to. adjoining plates.

It `is among the objects .of this `invention `to provide a furnace roof` patching block `which haswno `projections hat will interfere with its being shipped in the usual way, which can be quicklyhungin tplace, and `which requires no bending ofmetalparts in orderto support the block.

In accordance with this invention, a refractory brick is provided in one `side near its top with a recess. The same side of the brick'is covered by a` metal plate `that is secured to the brick and may be part of a metal case surrounding the brick. The plate is provided with an opening beside the recess. For supporting the plate, a separate bracket beside it has a portion extending laterally into the plate opening. ln one embodiment, the bracket extends down into the recess and has a tongue projecting into the plate opening. The bracket also extends above the plate, where it is bent laterally away from the brick so that it can be supported by the top of an adjoining block.

The invention is illustrated in the accompanying drawings, in which:

Fig. l is a perspective view of our patching block;

Fig. 2 is a fragmentary vertical section through a furnace roof showing two of the patching blocks hung in place;

Fig. 3 is a perspective View of the bracket;

Figs. 4 and 5 are perspective views of modified brackets;

Fig. 6 is a view, similar to Fig. 2, of a further modication;

Fig. 7 is a perspective view of the bracket shown in Fig. 6; and

Fig. 8 is a perspective view of a modified bracket.

Referring to Figs. l and 2 of the drawings, a furnace roof patching block is shown which is formed from three parts; a basic refractory brick 1, a metal case 2 surrounding the brick, and a sheet metal suspension bracket 3. The case is secured tightly t0 the brick to support it.

The brick has in one side at its upper end a notch or recess 5 that opens outwardly and upwardly. The metal plate that forms the side of the case that covers the recessed side of the brick is provided beside the recess with an opening, preferably a transverse slot 6. The purpose of the recess and slot is to receive bracket 3 so that the case and brick can be supported by it. Accordslot.

.ingl`y, -as shown `inFigs. 2 tand3, thebracket has a ver- `ticalportion that `extends `down. intothe brick recess, and

.the `patching block is inserted in the hole left in a furnace roof by a `block that has burned away or `been removed. The `upper part of the bracket above the patching blockis bent laterally away lfrom brick 1 and part way across the adjoining block so that the bracket can rest on and be supported by it as shown'. For best results, `thernain part of the bracket above the bricks is spaced from them, but it has` a down-turned outer end that engages the top of the `brick beneath it. This concentrates the weight of the patching block on a .narrow area of the adjoining brick and prevents the bracket from slippingoif `that brick, asit might do if the bracket laid flat against the top=of `the brick.

It will be seen that `the -`patching block -is made ready for `use `by simply hooking the bracket into the case Then the blockis lowered into the roof hole that has been made ready `for it, until the bracket rests on an adjoining block, which then forms the support for the patching block. When only one block in a roof arch is being` replaced, a suspension` bracket is not necessary becausethe downwardly tapered` shape of the patching block `will hold it in place in the opening of the same shape. Therefore, when an archedroofis being repaired, `this invention applies only `when two-or more adjoining blocks in an arch are being replaced. The rst patching block to be inserted in the roof is hung on one of the original roof blocks 9, as shown in Fig. 2. Then the neXt patching block is hung on the first one, and so on until the opening has been filled with patching blocks. I'f the roof is flat, our patching block can be used when only one block needs replacing.

To help in handling the patching block and lowering it into place, the bracket may be formed as shown in Fig. 4, with a laterally bent vertical Wing 11 provided 'with a hole 12 for receiving a handling hook. The wing projects `from the side of the bracket opposite to its tongue 13. ln this form, on account of wing 11, the bracket will have to extend considerably farther above the roof than the one rst described, so the downaturned upper end 14 of the bracket must be much longer than before. This bracket also can be used to support a brick in the initial installation of a suspended roof, as hole 12 furnished means for suspending the bracket from a hanger.

A similar perforated Wing 16 is shown on the bracket of Fig. 5, but in this case the upper part of the bracket that rests on an adjoining brick for support is also formed from a laterally bent wing 17 projecting from the side of the bracket opposite to wing 16. The lower outer corner of wing 17 has a depending lug 18 on it for engagement with the top of the adjoining brick to concentrate the weight of the patching block in a small area.

lt will be seen that the cased brick alone is a wedgeshaped unit Without any projections that would interfere with piling the bricks close together for shipping and handling. The cases can be made as before, except for slots 6. The brackets can be shipped in a separate container. It is not until a patching block needs to be used that it becomes necessary to attach a bracket to a. brick case. The attachment is a simple hooking-on procedure. No fasteners are used and no metal parts have to be bent into place.

In the modification shown in Figs. 6 and 7, the suspension bracket of the patching block is formed from a sheet metal hook 20 welded to the bottom of a horizontal plate 21 that preferably projects over the patching brick 22 as Well as over the adjoining brick-and has down-turned ends. The hook is shown extending along the outside of the brick case 23 and in through a slot 24, but it could just as Well extend down into the recess 25 of the patching brick. In either case, part of the hook is located in the recess and part of it outside the case, so it is desirable to provide the opposite side of the case with an opening or notch 26 to receive the exposed portion o'f the bracket hook supporting the adjoining patching block. The opposite ends of the top of the bracket rest on two bricks as shown, with the first patching block supported by the original roof block 27 next to it. To accommodate the adjoining hook, the case 28 of block 27 can be broken away at 29. The patching blocks in Fig. 6 are used in the same way as in Fig. 2.

In the modied bracket shown in Fig. 8, the top of the bracket 31 is provided with an upstanding lug 32 having a hole 33 through it for receiving a hook to facilitate handling of the block over a furnace roof, or for suspending the bracket from a hanger.

According to the provisions of the patent statutes, we have explained the principle of our invention and have illustrated and described what we now consider to represent its best embodiment. However, We desire to have it understood that, within l'the scope of the appended claims, the invention may be practiced otherwise than as specifically illustrated and described.

We claim:

l. A block for patching a lfurnace roof, comprising a refractory brick provided in one side near its top with a laterally and upwardly opening recess, a metal plate covering said side and secured to the brick to support it, the plate being provided with an opening beside said recess, and a separate bracket disposed in said recess be- 4 tween the plate and brick and having a laterally projecting portion inserted in said opening and hooked onto the plate for supporting the plate, the upper portion of the bracket extending laterally away from the brick and adapted to rest on top of an adjoining brick to support the bracket.

2. A b lock for patching a furnace roof, comprising a refractory brick provided in one side near its top with a laterally and upwardly opening recess, a metal plate covering said side and secured to the brick to support it, the plate being provided with an opening beside said recess and being bent inwardly directly above the opening to form a downwardly inclined tongue, and a separate bracket disposed in said recess between the plate and brick and having an outwardly struck tongue inclined upwardly and projecting into said opening and up beside the outer surface of said plate tongue to hook onto and support the plate, the upper portion of the bracket extending laterally away from the brick and adapted to rest on top of an adjoining brick to support the bracket.

3. A rfurnace roof block, comprising a refractory brick provided in one side near its top with a laterally and upwardly opening recess, a metal plate covering said side and secured to the brick to support it, the plate being provided with an opening beside said recess between the plate and brick and a separate bracket disposed in said recess and having a laterally projecting portion inserted in said opening and hooked onto the plate for supporting the plate, the bracket extending above the plate and having a portion extending laterally away from the brick and adapted to rest on top of an adjoining brick to support the bracket, and the bracket above the plate having a vertical portion provided with an opening.

References Cited in the flle of this patent UNITED STATES PATENTS

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