US6969A - Heney blbeckee - Google Patents

Description

H. & W. E. BLEEGKER & S. D. VOSE.

MOLD FOR CASTING.

PATENTED DEC. 25, 1849.

ilnrrnn diaries PATE T @rrrca IinNnY BLEEOKER, w. n BL ncxnn, AND SAML. n. VOSE, or ALBANY,

- NEW YORK.

IMPROVED PROCESS OF MAKING THIN lRON GASTlNGS.

Specification forming part of Let ers Patent No. 6,969. dated December 25, i 10.

- making part of this specification.

Figure 1 is a perspective view of the open mold standing on its edge, showing the surfaces between which the melted ironis poured,

with the boxes or knapsacks of non-conducting substance attached. Fig. 2 is a vertical section of the complete mold closed through the line at m, Fig. 1. I

Similar letters in both figures refer to corresponding parts.

The nature of our invention consists in the manner of using a combined mold in repetition for the purpose of casting light cast iron plates.

The following is a description of the invention or improvement: Two blocks of iron or metal, A and B, fitted closely and faced, are hinged-or connected together on their edges in the manner shown in the drawings, Fig. l, the process of opening or closing being performed like the opening and shutting of a book or the raising or depressing of a lid. A hollow space, H, is then formed in or between these two blocks, which, when they are closed together, correspond in size and shape to the pattern or casting wanted. In casting straight or uneven and configurated plates the mold is made to inclose a space that exactly corresponds with that which would exist in an ordinary mold of sand after any given pattern had been molded and withdrawn and the sand mold closed together. The surfaces of the mold may be cut or engraved from any given measure or model, but for configurated plates can be formed more readily and cheaply by taking false casts from a pattern in plaster, and then casting these false casts in metal and fitting and connecting them together. When the mold is thus formed, a channel or sprue is cut leading from the cavity to some point at the outer edge of the mold, as exhibited in Fig. 1, letter D, to admit the iron when poured is laid on by smoking the surfaces of oil; but when the mold becomes heated to into the mold. Before using the mold thecavity and sprue are coated on both sides with smoke. In order to obtain plates of a desirable softness, we heat the mold to a given temperature before using it, which is kept up by the process of repeated castings. To equalize the high temperature of the mold and to assist in maintaining a high and uniform heat, we apply a knapsack or covering to the outsides of the mold, which consists of a stratum of non-conducting substance (of ground pumice-stone or earth) incloscd in abox or frame, 0 c and fastened to the metal blocks. The mold is then clamped together by hooks E, or by any other convenient method, and is then ready for use. A single mold thus prepared answers for an indefinite number of plates,

The sur and is permanent in its character. faces of the castings are bright and smooth and require no cleaning or scra nng. The mold being properly fastened together, it has sufficient strength to resist the pressure or unequal straining of the metal i n its liquid state, and therefore prevents inequality ofthiekness, which renders castings liable to crack. mold being smooth and solid, no loose particles can mingle with the poured metal to render it unsound, and there can exist no decom position of water or gases. When the mold is in operation, the castin are thrown out hot as fast as the iron assumes a solid form. In

the first few operations of the mold the coating with a torch an intense redness, liquid oil is thrown on, which immediately ignites and burns off, leaving a residuum of smoke or carbon on the sun face. This coating resists the action of the iron and prevents adhesion between the mold and the casting. The design of the knapsack is to retard the natural conducting-power of the metal part of the mold. The non conducting stratum confines the heat withwhich the mold becomes surcharged, checking the toe sudden crystallization of the fused metahand preventingthe chilling or hardening of the casing. Besides assisting to produce soft castings, this knapsack maintains an equality of heat between the inner and outer sides of the parts of the mold, and by equalizing the ex pansion and contrac- The V tion of the inner and outer sides of the molcland provided with a case or knapsack which blocks prevents the mold itself from Warping contains anon-conducting material, the whole and cracking. process being conducted substantially in the What we claim as ouriuvention, and desire manner and for the purposes herein-set forth.

to secure by Letters Patent, is- I HENRY BLEEOKER. f

The process of making thin or light castings WILLIAM E. BLEEOKER. l

of iron by pouring the metal into a mold of SAML. D. VOSE.

iron that surrounds the article to be cast e11- I11 presence oftirely, withthe exception of the gates, said HENRY L. WILsON,

mold being previously smokecLon the inside, J Sussrous.

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