US3085523A

US3085523A - Furnace roof block

Info

Publication number: US3085523A
Application number: US83249A
Authority: US
Inventors: John W Lelak
Original assignee: Harbison Walker Refractories Co
Current assignee: Harbison Walker Refractories Co
Priority date: 1961-01-17
Filing date: 1961-01-17
Publication date: 1963-04-16
Anticipated expiration: 1980-04-16

Description

April 16, 1963 J. w. LELAK 3,085,523

FURNACE ROOF BLOCK Filed Jan. 17, 1961 2 Sheets-Sheet 1 Fig.1

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3,985,523 FURNACE R005 BLOCK John W. Lelak, Pittsburgh, Pa, assignor to Hal-bison- Walker Refractories (Company, a corporation of Pennsyivania Filed Jan. 17, 1961, Ser. No. 83,249 2 Claims. ('Cl. 110-99) This invention relates to furnace roof blocks, and more particularly to those provided with hanger-receiving recesses.

It is among the objects of this invention to provide a furnace roof block of the type that can be suspended from a metal hanger, in which there is a metal insert that locks the hanger in place and greatly increases the area of contact of the hanger with the block.

In accordance with this invention, an upright refractory brick has in its upper end a downwardly extending central slot, in opposite sides of the lower part of which there are recesses. The topof each recess is provided with a central notch. Disposed in the upper part of the recesses is a metal hanger plate having laterally spaced upwardly arched portions that fit in the notches. The central portion of the plate between its arched portions is slotted for passage of a hanger crossbar after the bar has been lowered through the slot in the brick. The arched portions of the hanger plate are adapted to receive the ends of the bar after it has been lowered through the plate, turned 90 and then raised into the recess notches, whereby the plate serves as an extended area portion of the hanger.

The invention is illustrated in the accompanying drawings, in which FIG. 1 is a perspective view of the roof block, with portions broken away;

FIG. 2 is a perspective view of the hanger plate;

FIG. 3 is a plan view of the block, showing a hanger inserted in the slot but not yet turned;

FIG. 4 is a fragmentary vertical section, taken on the line IVIV of FIG. 3, but with the hanger crossbar supporting the block.

FIG. 5 is a fragmentary vertical section taken on the line V-V of FIG. 4; and

FIG. 6 is a central vertical section similar to FIG. 4, but showing a modification of the invention.

Referring to FIG. 1 of the drawings, the main element of the block is an upright refractory brick 1. Preferably, the brick is formed from two or more refractory units, either burned or unburned, that are held together by a sheet metal case 2 in a well-known manner. Four units are shown consisting of two pairs of identical units 3 and 4. The units are spaced apart by

oxidizable metal sheets

5 and 6. Each sheet 5 may be integral with a sheet 6, which can be accomplished by bending a larger sheet at right angles. The upper end of the brick is provided with a downwardly extending central slot 7, the upper portion of which, for best results, does not extend horizontally all the way across the brick. The slot extends down into the brick a couple of inches or so and the opposite sides of its lower portion are provided with recesses 8. Midway between its ends, each recess is provided with an upwardly extending portion or notch 9.

Metal sheets

5 and 6 are cut away to prevent them from extending into the slot and recesses.

It is a feature of this invention that a metal hanger plate 11 is inserted in recesses 8. The plate is heavy enough to be rigid. Preferably, the opposite ends of the recesses and the lower part of slot 7 extend out through the sides of the brick so that a horizontal passage with rectangular end openings 12 extends entirely through the brick. The hanger plate then can extend substantially all of the way through the brick for engagement with a greater 3,085,523 Patented Apr. 16, 1963 area of the material. The plate is held in the upper part of the tranverse passage by integral legs 13, which may be formed by bending down opposite sides of the plate to provide vertical flanges that also will stifien formed conveniently by striking up predetermined areas of the plate, or the plate can be a cast member. The arched portions are madelarge enough to receive the ends of the crossbar 16 at the lower end of a typical hanger 17, as shown in FIG. 5. The central portion of the plate is provided with a slot 18 extending lengthwise of it and laterally from one arched portion to the other. This slot may have the same area as the upper part of the brick slot 7, but if smaller it must be at least large enough to receive the hanger crossbar as shown in FIG. 3. Of course, the hanger plate is inserted in the brick before the units 3 and 4 are assembled in the case, which therefore locks the plate in the brick.

To assemble this roof block and a hanger for it, the crossbar 16 at the lower end of a hanger is lowered through the brick slot 7 and the plate slot 18 and into the area below the hanger plate, which is deep enough for that purpose. Then the hanger or the brick is turned so that the ends of the crossbar will be beneath recess notches 9. The hanger then is raised to lift the ends of the crossbar into the arched portions of the plate, as shown in FIGS. 4 and 5. The block and hanger then cannot be turned again relative to each other without first lowering the hanger or lifting the block to remove the crossbar from the notches. The refractory brick rests on the metal plate, which in effect becomes the foot of the hanger, and therefore the weight of the brick is distributed over a much larger area of the metal hanger than if the brick directly engaged the hanger crossbar only. This makes it much less likely that the upper part of the brick will break out.

In the modification shown in FIG. 6, everything is the same as just described, except that the hanger plate 21, with its arched portions 22, does not have any supporting legs. Instead, it is held at the top of the recess 8 by securing it to their upper walls by a suitable adhesive. That is done at the time the block is manufactured.

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

1. A furnace roof block adapted to be suspended from a crossbar at the lower end of a hanger, comprising a refractory brick disposed on end and having in its upper end a downwardly extending central slot and recesses in opposite sides of the lower part of the slot, said brick being formed from a plurality of refractory units placed side by side, means holding said units tightly together, the top of each recess being provided with a central notch, a metal plate disposed in said recesses and having laterally spaced upwardly arched portions, legs integral with the plate supporting it in the upper part of the recesses with said arched portions disposed in said notches, the central portion of the plate between said arched portions being slotted for passage of a hanger crossbar lowered through said brick slot, and said arched portions being adapted to receive the ends of such a bar when it is turned 90 below the plate and raised.

2. A furnace roof block adapted to be suspended from a crossbar at the lower end of a hanger, comprising a refractory brick disposed on end and having in its upper end a downwardly extending central slot and recesses in opposite sides of the lower part of the slot, said brick being formed from a plurality of refractory units placed side by side, means holding said units tightly together, the top of each recess being provided with a central notch, the ends of said slot and recesses extending out through the adjacent sides of the brick to form a transverse passage through the brick a rectangular metal plate extending most of the way through said passage and having laterally spaced upwardly arched portions midway between its ends, vertical flanges extending down- Ward from opposite side edges of the plate to support it in the upper part of the recesses with said arched portions Q disposed in said notches, the central portion of the plate between said arched portions being slotted for passage of a hanger crossbar lowered through said brick slot, and said arch portions being adapted to receive the ends of such a crossbar when it is turned 90 degrees below the plate and raised.

References Cited in the file of this patent UNITED STATES PATENTS 1,448,879 Stripe May 20, 1923 2,465,170 'Rochow Mar. 22, 1949 2,915,893 Wilkins Dec. 8, 1959 2,960,048 Garretts Nov. 15, 1960 FOREIGN PATENTS 902,541 Germany Jan. 25, 1954 771,895 Great Britain Apr. 3, 1957 92,528 Norway Oct. 6, 1958

Claims

1. A FURNACE ROOF BLOCK ADAPTED TO BE SUSPENDED FROM A CROSSBAR AT THE LOWER END OF A HANGER, COMPRISING A REFRACTORY BRICK DISPOSED ON END AND HAVING IN ITS UPPER END A DOWNWARDLY EXTENDING CENTRAL SLOT AND RECESSES IN OPPOSITE SIDES OF THE LOWER PART OF THE SLOT, SAID BRICK BEING FORMED FROM A PLURALITY OF REFRACTORY UNITS PLACED SIDE BY SIDE, MEANS HOLDING SAID UNITS TIGHTLY TOGETHER, THE TOP OF EACH RECESS BEING PROVIDED WITH A CENTRAL NOTCH, A METAL PLATE DISPOSED IN SAID RECESSES AND HAVING LATERALLY SPACED UPWARDLY ARCHED PORTIONS, LEGS INTEGRAL WITH THE PLATE SUPPORTING IT IN THE UPPER PART OF THE RECESSES WITH SAID ARCHED PORTIONS DISPOSED IN SAID NOTCHES, THE CENTRAL PORTION OF THE PLATE BETWEEN SAID ARCHED PORTIONS BEING SLOTTED FOR PASSAGE OF A HANGER CROSS BAR LOWERED THROUGH SAID BRICK SLOT, AND SAID ARCHED PORTIONS BEING ADAPTED TO RECEIVE THE ENDS OF SUCH A BAR WHEN IT IS TURNED 90* BELOW THE PLATE AND RAISED.