US623146A - Evan j - Google Patents

Description

No. 623,146. Patented Apr. I8, |899. E. J. FRANCIS 0. H. BURGHAM.

ANNEALING BOX.

(Application lad June 3, 1898.1

(No Model.)

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lINiTEn STATES PATENT OFFICE.

EVAN J. FRANCIS AND OLIVER H. BURGHAIWI, OF NEV KENSINGTON, PENNSYLVANIA.

ANNEALlNG-BOX.

SPECIFICATION forming part of Letters Patent No. 623,146, dated April 18, 1899.

Application filed June 3, 1898. l Serial No. 682,429. (No model.)

To @ZZ whom it may concern.-

Beit known that we, EVAN J. FRANCIS and OLrvER H. BURGHAM, residents of New Kensington, in the county of 'Vestmoreland and State of Pennsylvania, have invented a new and useful Improvement in Annealing-Boxes; and we do hereby declare the following to be a full, clear, and exact description thereof.

Our invention relates to annealing-boxes.

The object of our invention is to provide a form of protection for the annealing box against the intense heat to which it is subjected within the annealing-furnace, and so increase the life of the box.

To these ends our invention comprises certain novel features hereinafter set forth and claimed.

To enable others skilled inthe art to make and use our invention, we will describe the same more fully7 referring to the accompanying` drawings, in which- Fignre l is a perspective view of our improved annealing-box. Fig. 2 is a view of the cap removed. Fig. 8 is a cross-section of the box.

Like letters indicate like parts in each of the iigures.

In the accompanying drawings the letter ct represents a suitable annealing-box, formed of cast-iron or other suitable metal, adapted to contain the metal to be annealed, said box when in use resting on the bottom or base b. The lugs c on the sides of said box furnish means for grasping the box by suitable mechanism for lifting it from or placing it on the bottom l).

On the box CL is the cap or shield d, formed of cast-iron or any other suitable .incombustible material. This cap cl incloses the upper edges and corners of the box, as well as upper portions of the walls of same. The cap cl has formed therein the ledge or shoulder e, which is adapted to rest on the top of the box, whereby an air-space is left between the upper face of the box and said cap. As the central portion of the cap is not so directly exposed to the action of the heat, the cap is not necessarily made solid; but to save material it may be formed with the opening f. The cap may also be supplied with lugs g for purposes of handling.

When our improved annealing-box is in use, the cap d is lowered onto same before it is placed in the furnace.

When in the furnace, the upper edges, corners, and upper portions of the walls of the box are subjected-to the highest heat, and ordinarily the boxes crack and warp at these points. If these boxes develop such cracks, they are useless, as the admission of air to the box willoxidize the metal contained therein and make it of no value. By the employment of the cap or shield these exposed parts of the box are protected and the cracks prevented. Furthermore, the air-space between the cap and lthe top of the box tends to prevent the action of the heat on the cap as well as the box, so that said cap will last longer. Of course when a cap wears out it has to be removed and another substituted; but the cost of the cap is small in comparison with the cost of an entire new box.

The cap may be formed of asbestos, ifA desired, owing to its well-known heat-resisting qualities.

What we claim as our invention, and desire to secure by Letters Pat-ent, is-

An annealing-box having a removable cap of incombustible material, said cap being so supported thereon as to leave an air-space between said cap and the upper face of said box, substantially as set forth. f

In testimony whereof we, the said EVAN J. FRANCIS and OLIVER H. BURGHAM,have hereunto set our hands.

EVAN J. FRANCIS. OLIVER H. BURGHAM.

Witnesses: l v

ROBT. D. TOTTEN, JAMES I. KAY.

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