US1376448A - Annealing-box - Google Patents

Description

H. T. McBRATNEY.

ANNEALING BOX.

APPLICATION FILED Nov. 4. 1920.

1,376,448. Patented May 3, 1921.

FIEJI- UNITED lsTATEs PATENT OFFICE.

'HARRY T. MCBRATNEY, or TARENTUM, PENNSYLVANIA, AssIGNOR'frO VALLEY HOLDING CORPORATION, or BRAOKENRIDGE, PENNSYLVANIA, A CORPORA-v TION OF PENNSYLVANIA.

ANNEALING-BOX.

Patented May 3, l1921.

Application led November 4, 1920. Serial No. 421,669.

To all fui/m t may concern.'

Be it known that I, HARRY TfMoBRATNEY, of .Tarentum, in the county of Allegheny and State of Pennsylvania, have made a new and useful Invention lin Annealing- Boxes, of which the following is a specification.

My invention relates to annealing boxes and consists in a sheet metal body adapted to remain rigid under the high temperatures to which such boxes are subjected.

These temperatures are such that no practical construction is rugged enough to have long life. But even for a single use the box must be rigid enough not to collapse. The object of my invention is tol provide the requisite rigidity without incurring the expensive construction attendant upon castiron boxes or heavy structural boxes, the cost of which is a continuously recurring charge.

Another object is to construct a box which will heat readily and when the heating is completed, will not unduly impede heat radiation from the contents of the box.

These objects are attained bythe construction shown in the accompanying drawings in which Figure l is a top viewl of my box; Fig. 2 is a longitudinal vertical 'section through the box and Fig. 3 is va transverse vertical section through the box.

The box base l may be of cast iron, rolled steel or be otherwise formed. It is provided with a continuous trough 2 adjacent its perimeter for sealing purposes. The bo-x sides and ends 3 are of sheet steel having their upper edges flanged at 4 and their adjacent edges welded to provide tight joints.

The bOxtOp is a rectangular sheet 5 fitting over the anges 4 and welded thereto. As the lower edges of sides and ends 3 fit in seal trough 2, the box, when assembled, and trough 2 filled with sand 0r other suitable material, is gas tight. l

To prevent collapse of the box .top and to facilitate heat absorption and radiation, I apply members 6 of long, rectangular sheets bent longitudinally to V-shape and provided with flanges 7 for welding or riveting to top 5. Members extend the full width of the box and-form with top 5 a plurality of box girders which eliminate any tendency of the top to sag when heated. As members 6 are open at their ends they permit free circulation therethrough of heated gases when the box is in the anneal- Ing furnace, and of air when the box is outside of the furnace.

This construction avoids the use of heavy castlng or structural reinforcing members with. the attending disadvantages and its cost is relatively small so that its scrapping after a number of annealings does not add materially to the cost of the plates being annealed or otherv product.

Obviously, the side and endwalls may be similarly reinforced and variations in the shape of the reinforcing members and other modications' in the box construction may be made without departure from the spirit of my invention.

I claim as my invention:

l. A sheet metal annealing box reinforced by hollowV-shapedstitfeners of sheet metal.

2. In an annealin box, a wall of sheet metal and hollow stiener members ofnsheet metal extending across s aid wall and having open ends.

3. An annealing box comprising a bottom having a perimetric recess, sheet metal side and end walls adapted to seat in said recess and having their adjacent edges welded toand between their ends, I

gether, a top supported on said walls and end to provide f-ree circulation of gas or air l therethrough. i

In testimony whereof, I have hereunto subscribed my name this 2nd day of November, 1920.

- HARRY T. MCBRATNEY.

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