US1712438A - Mold and method of making the same - Google Patents

Description

y 1 1929. R. JONES 1,712,43

MOLD AND OF MAKING THE SAME F11 6 Nov. 50, 1927 2 Sheets-Sheet 1 Jkwz-a x6. Jon/5,

E) 7, 1929- 'J.- R; JONES 1,712,438

"OLD AND METHOD OF KING THE SAME Filed Nov. so, 1927 2 Sheets-Sheet 2 .hMEa 16". JONES,

Patented Wiley 7, 1929.

warren STATES JAMEfi JONES, OF JOHN$TOWN, PENNSYLVANIA.

llIOLD AND METHOD OF HEARING THE SAIJIE.

Application filed November 30, 1927. Serial No. 236,696.

This invention relates to molds and the method of making said molds, and more particularly to molds used in casting the splice bar ends of switch pieces, frogs and other railway track structure parts, and has for its object the provision of a novel form of mold including a separate core piece carrying the bolt hole cores.

Itleretofore the practice has been to make a separate mold-piece to form each side of the splice bar end of a railway track structure part and it is next to impossible to set these individual mold-pieces into the main mold so that they will be correctly spaced and alined. "When bolt holes are to be cored by the old practice print holes were formed into which plugs were mounted to form the bolt hole cores and if the mold-pieces were not properly spaced and alined, the bolt holes would be inaccurate.

The structures cast by the use of the moldpieces as heretofore formed were in many cases inaccurate so as to compel the alternating thereof by welding and grinding which added greatly to their cost of manufacture.

The present invention eliminates all the troubles resulting from the incorrect spacing and alining of the old form of mold-pieces and provides a single mold piece which, with ordinary skill, will produce perfectly formed castings.

in the drawings Figure 1 is a sectional view through a boX in which the mold is formed in accordance with this invention.

Figure 2 is a perspective View of a bolt hole core piece.

Figure 3 is a plan view of the mold formed shown in Figure 1 and having the bolt hole core mounted. therein. 7

Figure a is a side elevation thereof.

Figures 5 6, and 7 show end elevations of molds for various forms of rail shapes.

Referring more particularly to the drawings, the numeral 2 designates the mold box in which the mold 3 is formed. A suitable pull-out rail or pattern l is mounted 1n the inold box 2 and the til-shaped arbor 5 is also mounted in the box 2 with its closed end extendin around the point end of the pull-out rail. After the pull-out rail t and arbor 5 are thus assembled in the box 2 the sand or other core forming material is rammed into the box around the pull-out rail and arbor so as to form the one-piece mold 3.

The pull-out rail or pattern is provided on its one side face with projection or print por tion 6 extending along its entire length so as to form a print or recess 7 in the side face of the mold cavity 8 of the main core when the pull-out rail is removed. The recess 7 v is adapted to receive a core member B composed of a substantially fiat rectangular body portion 8 of a size to snugly lit into and fill the recess 7 and having a plurality of bolt hole core projections 9 formed integrally therewith.

The core B is adapted to be separately formed and to be inserted or mounted into the recess 7 of the finished mold 3.

The core B will be secured against displacement by nails 10 as is common in the molding art.

It will be understood that the core B may have any number of bolt hole cores 9 thereon necessary to form the bolt holes in the casting, and if desired or necessary, two or more of such cores may be used.

In Figure 5 a mold structure is shown for use in casting T-head rail sections, in this mold the core B being positioned at the top of the mold cavity.

In Figure 6 a mold structure is shown for use in casting what is known as nine inch girder rails. These rail ends have two rows of bolt holes and two cores B are used, one of which is mounted in each side face of the mold cavity, one for the upper and one for the lower row of holes. v

In Figure 7 a modified mold construction is shown for casting the same type of rail end as shown in Figure 6. In this construction the mold cavity 8 is formed of a greater width than the web of the rail and one core is mounted in the cavity and forms the entire one face thereof, while the other face of the mold cavity is recessed and a second core 9 is mounted in the recess.

By constructing molds in accordance with this invention the resulting castings will be true and the bolt holes will be correctly formed and located so that a minimum of work will be necessary to finish such castings for use. This is especially advantageous when making manganese steel castings since it is impractical to bore or ream. the bolt holes in such castings and all other finishing work is difficult and expensive.

I claim 1. A mold for use in casting the splice bar ends of switch pieces, frogs and other railway track structure parts having bolt holes cored therein, comprising a one-piece U-shaped a core-piece mounted iii-said recess, nails projecting through said vcore-piece and into said mold body for preventing displacement of I said core-piece, said core comprising a body -port1ono'f such size as .to snugly fit into and fill said recess, and at least one bolt hole core formed integral with said body portion of said core and extending entirely across said mold cavity in said mold body.

2. The method of forming molds for use incasting, the splice bar ends of switch pieces, frogs'and other railway track structure parts having bolt holes cored therein, which consists in mounting a U-shaped arbor in a mold box, then mounting a pull-out rail having at least one projection extending lengthwise along at least one side face in said box and Within said U-shaped arbor, then direct rainming mold forming material such as sand in the mold boX around said pull-out rail and arbor until said box is completely filled to form a complete mold body, pulling out said pull-out rail so as to form a mold cavity having a recess in its one side face corresponding to said projection on the one side face of said pull-out rail, then forming a core of a size substantially equal to said recess and having at least one integral bolt hole core thereon. then mounting said core in said recess, and se curing said core against displacen'lent.

In testimony whereof, 1 have hereunto signed my name.

JAMES R. JONES.

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