US1038550A - Core. - Google Patents

Description

M. H. FLETCHER.

GORE.

APPLICATION FILED MAY 21, 1912.

Patented Sept. 17, 1912.

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' MORDEGAI H. FLETCHER, 311 GINCINNATI, OHIO.

CORTJ.

To all whom it may concern Be it known that I, Monnnoar H.

'FLETGHER, a citizen of the United States,

residing at Cincinnati, in the county of Hamilton and State of Ohio, have invented Letters Patent #820858, issued to me Mayj In my present invention, instead of ordinary paper of one or more layers, with or. without perforations, and with or WlillOllt;

a waterproof outer layer or coating, 1 use embossed paper of any of the cheap qualities readily procurable in the market. It will be understood that there must be a sutl cient thickness of the combustible paper to enable the core bar to be withdrawn after the pipe has been cast and the paper burned by the heat of the metal. The required thickness ,in the smaller pipe is usually about i; of an inch, and embossed paper, when wrapped upon the core bar, facilitates ventilation in carrying oft gases from the burning paper, and at the same time accomplishes a great economy in the saving of the amount of paper used, to the extent of the voids provided by the embossing.- Ordinarily, the paper is wrapped spirally upon the bar, each layer lapping over the preceding layer -1- its width, its width, or i its width, according to the number of thicknesses required to provi e the requisite thickness of the combustiblle layer, for the particular pipe to be least. he embossed paper is better thanifiat paper as it lies on the core barrel. smoother and adapts itself better to the uneven surface formed by the edge of the preceding layer or layers and the core barrel.

By embossed paper, as the term is here used, is meant a paper or sheet of combustihle material, pressed in parts out of a continuous plane surface, forming preferably a more or less regular pattern so that -jt're- Specification of Letters Patent.

Patented Sept. 1?, 1912,

Application filed May 21. 1912. Serial No. 69839? quent air spaces are leftadjacent to the core surface. L

The drawings attached hereto show how the core is built up for use'in casting cylin- 5'0 drical pipes, and

Figure 1 is an exterior View of a veilted metal core barrel, wountl spirally with a strip of combustible material in sheet form, with part of the wound portion partially as coated with a finishing layer of loam and mud. Fig. 2 is a transverse cross section of a completed core. F ig. 3 is aplan View of a piece of the embossed paper used for the combustible layer; and Fig. 4 is a'spiral sec- 79 tion of the core and longitudinal section or the paper showing the air spaces.

Referring now to the drawings, 0 designates a metal core barrel vented by suitable drilled or other holes, 1; to permit' the escape 75 cl gases formed by heating the earthy layer and the burning of the layer of combustible material, etc.

G. P. designates the core barrel when wound with the embossed paper strip, P, so in Fig. 1, shown as applied spirally, each succeeding layer overlapping the one preceding it. The combustible layer so built up of the paper P gives a sufficient thickness to permit the core bar C to be withas drawn after the pipe has been cast. The paper P is embossed, portions of its surfaces, 7), being pressed outward from the plane of the main surfaceso as to form a secondary plane. This embossingernaly, be soof any style or pattern desired. Upon the combustible layer is formed a noncombustible lavur L: of mud and loam, or other suit-ablev material. This is ordinarily: bated with 'l'iiackening, and when the core is ri ed, 95 it is inserted in the flask and th molten. metal poured around the core in t e flask. The embossed paper may be made of any materials or composition of matter found convenient, or that will produce a paper at 10o an acceptable price. The ordinary carpet paper so embossed has been found to give satisfactory results. A combustible paper strip be wound on by hand or in any other convenient way, and may be held in ice place by adhesive material, or, preferably, by tying with thincord or soft wire. All superfluous or overhanging portions may trimmed away at each end of the core bar. The loam and mud, or finishing layer, may llu be turned upon the bar in the usual way after it is wrapped with the combustible layer. After the metal has been poured, the combustion of the layer of paper, while complete because of the intense heat of the molten metal surrounding the .core, is slow enough to allow the loam or finishing layer to retain its proper form until the metal sets? The venting will be complete and perfect through the agency of the embossed paper and the vents 'v of the core barrel.

This invention secures smooth and uniform castings at a less cost than with other methods, and further reduces the percentage of failures or castings which must be rejected because of imperfections.

While I have referred in the foregoing description to paper as the material used as the wrapping for the core barrel, I intend that this term shall include any embossed combustible material in sheet form and, therefore, I do not limit the material used "to paper alone. p

I claim as my invention and deslre to secure by Letters Patent of the United States like, consisting of a metal core barrel, hav

mg one or more layers of embossed comone or/more non-combustible outer layers.

3. An improved core for casting pipes,

consisting of a met-a1 core barrel wrapped in a spiral direction with a relatively wide and thin strip of embossed combustible material; and one or more non-combustible outer layers.

4. An improved core for casting pipes, consisting of a metal core barrel wrapped in a spiral direction with a relatively wide and thin strip of'embossed combustible ma terial, said layers so applied as to overlap one or more preceding layers; and one or more non-combustible outer layers.

5. A core for casting hollow pipes and the like, consisting of a metal core barrel wrapped with embossed paper in sheet form,

and one or more non-combustible outer layers. I

6. A core for casting hollow pipes and the like, consisting of a metal core barrel provided wit-h vents and wrapped with embossed paper in sheet form, and one or more non-combustible outer layers.

In testimony whereof I have hereunto set my hand in presence of two subscribing wit- MORDEGAI H. FLETCHER. WVitnesses IVALTER A. KNIGHT, ALICE L. TILDESLEY.

'IIBSSBS.

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