US1764768A - Annealing box - Google Patents

Description

June 17, 1930.

H. WILLIAMS ET AL ANNEALING BOX Filed Feb. 1o, 1928 ----.IFL- .F----T -LTi --.#55 --.NMF-Izsizllb PAT'N'r ier-aceN HARVEY WILLIAMS,.OF MASSILLON, OHIO, AND JOSEPH W. MCHUGH, OF PITTSBURGH, PENNSYLVANIA, ASSIGNORS TO PTTSBU'RGH STEEL FOUNDRY CORPORATION, OF GLASSPORT, PENNSYLVANA, A CORPORATION OF PENNSYLVANIA i I ANNEALING- BOX Application filed February 10, 1928. Serial No. 253,364.

The invention relates to annealing boxes of the type in which a hood rests upon a flat surfaced base of rectangular` ferm and of very heavy section provided with a peripherally disposed uprising flange which, with the lower edge of the hood, forms a trough in which sand is packed to prevent ingress of air during the annealing operation. These boxes are subjected to very high temperatures, and the corners of the base plate, being heavy and unsupported, sag sufficiently under the heating to break 'the sand seal, permitting air to reach the hot materials inside of the hood. This sagging of the corners not only breaks the sand seal, but drags on the floor when taking the box out of an oven. V

The object of the invention is to provide a base for such an annealing box in which the tendency of the corners to sag is substantially eliminated, and which requires less metal in its construction than prior The invention resides in the provision of an.

annealing boX base plate having its corners of reduced section for decreasing the weightof unsupported metal at those points and thus `substantially eliminate sagging and consequent ingress of air during the heating. Preferably this is accomplished by providing a base having corners biased from the normally substantially rectangular outline of the base.

In the accompanying drawings, which illustrate the preferred embodiment of the invention, Fig. 1 is a plan view of the iinproved base with a hood set thereon; Fig. 2 a longitudinal sectional view taken on line IL-II, Fig. 1; Fig. 3 a transverse sectional View taken on line III-IH, Fig. l, the hood not being shown in Figs. 2 and 3 for simplicity of representation; and l a detail setional view taken on the line lV-V, Fig. l.

Referring to these figures, the structure shown comprises a material-supporting base l of fundamentally rectangular outline, provided peripherally with a vertical flange 2. On its under side parallel grooved roller tracks 3 and 4c are provided, together with spaced reinforcing webs or ribs 5, and at its ends there are coupling lugs 6 for attachment to a means of moving the box. A cover or hood 7, of the substantially rectangular form commonly used, rests on the upper surface of the base l inside the flange 2, the space between the hood and the flange being `filled with a packing material, such as sand, to seal the interior of the hood against the ingress of air during an annealing operation.

The baseis fundamentally rectangular, but according to the invention its corners are biased in a manner similar to that shown in Fig. l. This biasing or cutting back ofthe corners is carried inwardly to bring the surfaces of the flange on the biased corner as near to the corners of the hood as is consistent with adequate sealing.

In the use of annealing bones and hoods the sides and ends of the latter generally buckle considerably, so that provision is made for a trough between the hood and the base flange which is wide enough to allow such distortion without consequent breaking of the seal. The

meeting of the sides and ends, however, has a reinforcing effect upon the corners, so that they do not buckle appreciably, and for this reason the biased corners may be outback to forma narrower trough than is used at the sides and ends.` i c The effect of this cutting off the corners is to materially decrease the amount of unsupported metal at those points, so that there is little, if any, tendency for the corners to sag under heat, and a perfect seal can be maintained during the annealing operation. The corners may be biased to truncate the corner angle to form a single plane connecting the tivo adjacent sides; or they may be arcuate. The somewhat arcuate corner 8 shown in Fig. 1 is preferred because when thus biased the corner is brought closer to the hood than by making it truncate asdefined above, and the unsupported metal at the corner is thus re duced to a minimum. In order to further reduce the weight at the corners of the base, the thickness of the cerner section may be reduced, as shown in Fig. 4, where the section of the bottom l at the corner decreases outwardly, being a minimum at the outermost corner.

By the use of this form of annealing box base, all danger of distortion sufficient to disturb the seal is eliminated. 'The base can be made as easily as the forms hitherto used, and because less metal is required, the bases are cheaper, are easier to move, andless heat is required in`bringing the box and its contents up to annealingtemperature. y

According to the provisions of the patent statutes We have explained the principle and operation of our invention, and have illustratedand described what We new consider to be its best embodiment. However, We desire to have it understood that7 Within the scope of the appended claims, the invention inay be practiced otherwise than as specifically illustrated and described.

lVe claim:

l. An annealing box comprising` a bottom olY substantially rectangular outline provi-ded at its edges with a. peripheral upwardly extending` flange, and a hood adapted to rest on said bottoinand to torni with said flangea trough for a sealing medium, the corners of said'bottoin beingbiased'to bring said flange closer to the hood at thev corners than along` the sides and thus to reduce the amount of unsupported :metal at the corners and to clinii'nate the breaking of a seal by the sagging of corners When the box is in service.

2. Anannealing bon comprising a base of substantially rectangular outline provided at its edges with a peripheral upwardly extending` 'flan-ge, and a hood adapted to rest on said Ibase and to 4torni with said iangre a trough for a sealinginedluin, the corners of the base being reduced in section outwardly from adjacent `the corners oi the hood to eliminate breaking et a seal by the sagging 0l corners when the box is in service.

3. An annealing box comprising a base oi substantially rectangular outline provided at its edges with a peripheral upvvardlyextending iange, and a hood adapted to rest on said base and to form with said flange a trough for a sealing medium, the corners of said base being,r ybiased to bring said flange closer to the corners of the hood ythan at the sides and being also of reduced section out Wardly 'from adjacent the corners of the hood to reduce the ainount of unsupported metal at the corners and to eliminate the breaking' of a seal by the sagging of corners ,When the box is in service.

In testimony whereof, We hereunto sign our naines.

HARVEY VHJLAMS. JOSEPH W. MOHUCYH..

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