US1288326A - Mold-jacket and method of making the same. - Google Patents

Description

I. F. WEST.

MOLD JACKET AND METHOD OF MAKING THE SAME.

APPLICATION FILED MAY 2, 1917.

1 88,325 Patented Dec. 17, 1918.

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UNITED STATES FATENT OFFICE.

JOHN F. WEST, OF LANCASTER, NEVT YORK.

MOLD-JACKET AND METHOD OF MAKING THE SAME.

Application filed May 2. 1917.

'1 b all whom it may concern Be it known that 1, JOHN F. Wnsr, a citizen of the United States, residing at Lancaster, in the county of Erie and State of New York, have invented new and useful Improvements in Mold-Jackets and Methods of Making the Same, of which the following is a specification.

This invention relates to the tapering mold jackets employed in foundries for supporting the molds made in snap-flasks and to a method of making the same.

In order to properly support all portions of such molds to prevent cracking or breaking thereof during the pouringoperation, it is customary to make the jackets of such height and dimensions that when snugly fitted over the molds they terminate no less than an inch from their top and bottom.

As is well known, the level or elevation of the parting line of such mold varies according to the nature of the articles to be cast, the line being near the horizontal center of the mold in some cases and a greater or less distance from it. in others. According to the present practice, such jackets are laid out or measured on the parting lines oi the molds aS a basis. For example, if the external width of such a mold is eight inches at the parting line, the corresponding contiguon portion of the companion acket 1 5 made of the same internal width. While that particular jacket will properly fit and support molds with that particular parting lme, it will not properly fit other molds of the same height having their parting lmes located at a different height or level, even though their width at the parting lines s the same. Obviously, if the parting l1ne s higher than that on which the jacket is lald out, the jacket will stop or stand higher on the mold and leave its lower portion uncovered and unsupported to an excessive extent, while if the parting line is lower, the jacket will descend too far over the mold and leave its upper portion uncovered to an objectionable degree. It follows that by this method of laying out mold jackets, as many separate and distinct jackets are required for molds of the same height as there are different parting lines in that slze, necessitating not only the use of a large number of jackets and entailing a corresponding expense for repair and renewals, but also requiring considerable space for thelr storage.

The aim of my invention is the production Specification of Letters Patent.

Patented Dec. 17, 1918.

Serial No. 166,000.

of a universal mold jacket which will fit series of molds of substantially the same height or size but having difierently-located parting lines, thus greatly reducing the number of jackets required for a given variety of molds and correspondingly lessenmg the outlay for this foundry-item, as well as economizing in storage space.

To that end my invention consists of a jacket laid out on the horizontal median line of the molds instead of their varying parting lines.

In the accompanying drawings:

Figures 1% are transverse vertical sections of a series of ordinary sand molds of about the same dimensions having different parting lines and supported by their companion jackets. Figs. 5-8, inclusive, are similar sections, showing the impracticability of asingle jacket of ordinary construction for more than one of such molds. Figs. 9-12, inclusive, are similar sections of the same series of molds supported by my improved jacket, showing it universal applicability to entire series. Fig, 13 is a. perspective view of one of the improved jackets.

Similar characters of reference indicate corresponding parts throughout the several vlews.

Referring to Figs. l-t, the parting lines 1) of the tour ordinary molds A, B, C and D, are located at difierent levels, but the molds are all f the same width at their parting lines, say eight inches, for example. The ordinary companion jackets l, 2, 3 and 4, for those molds are laid out on those parting lines, respectively, with the result that while each fits its own mold it will not properly fit any of the rest. By reference to Figs. 1 to 4, it will be seen that the several jackets fit their respective molds, the lay-out line Z of each jacket coinciding with the parting line 3? of the companion mold. But when it is attempted to interchange these jackets none of them will properly support the molds. As seen in Fig. 8, if the jacket 1 be placed over the mold D, it can descend no farther after its lay-out line registers with the parting line of that mold, the jacket projectmg a considerable distance above the mold and leaving its base and middle portions unsupported. The same is true when the jacket 2 is placed on the mold C; while when the jackets 3 and 4: are applied to the molds A and B, they fit them so loosely that no parts of the molds are supported.

snap-flasks with different parting lines is to As before briefly described, each of my improved jackets 5, shown in Figs. 9-12, is constructed or laid out on the horizontal center or median linem of a series of molds, A B C D of substantially the same height or size having parting lines at different levels, but regardless of those lines, the lay-out line of the jacket being dotted and designated Z By this construction of the jacket, its lay-out line coincides with the median line of each and all of the corresponding series of molds, suiting one and the same jacket to the entire series and properly fitting and supporting any one of them, as is obvious from a comparison of Figs. 9-12, each of the four jackets there shown being interchangeable with any one of the other three and each fitting any of the four molds, irrespective of the difierent levels of their parting lines. Each jacket is thus universally applicable to a series of molds with different parting lines but of approximately the same height or size.

By this improvement, the number of jackets required for a given variety of molds is very materially educed, effecting an important saving in the cost of jackets and their repairs and renewals, and also in the amount of floor space required fortheir storage.

The present practice of building a serles of start an inch and a half from the bottom of the fiask'and make successive partings every half inch to within an inch and a half from the top; that is, 111, 2, 2%, 3 inches, and so on.- By this construction, nine different sizes of jackets are required for the usual variety of molds made in a snap flask 16 inches long, 12 inches wide and 7 inches high. By the use of this improvement, but a singlesized jacket is required for the same variety of molds, one size doing the work of nine 21 messes sizes of ordinary construction. This material gain is due partly to the fact that only a single jacket or a given size is required for molds of somewhat different heights, say seven and eight inches, respectively. On a seven-inch mold a sand margin of half an inch is left above and below the jacket, whereas on an 8 inch mold a sand margin of one inch is obtained with the same sized jacket.

While affording these important advantages, the improved j acketcan be constructed as cheaply as those now in common use.

The mold jackets may be providedwith rigid or movable or adjustable walls. I do not Wish to limit myself to any particular construction of jacket, except as defined in the appended claims.

The snap-flasks in which the molds are made are laid out in the same manner as the mold-jackets herein shown and described. Such flasks and their method of construction will form the subject of a separate application for patent.

I claim as my invention:

1. lhe combination with a series of tapering sand-molds of substantially uniform size having differently-located parting lines, of a tapering universal jacket applicable to all of said molds and constructed of the same interior dimensions at its horizontal median line as the external dimensions of the molds at their median line. 7

2. The hereindescribed method of laying out a tapering universal mold jacket to fit a series of sand molds with difierent parting lines, which consists in so constructing the jacket that its internal dimensions at its horizontal median line are the same as the external dimensions of said series of molds at their horizontal median lines.

' JOHN 'F. WEST.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. G.

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