US500500A - Alfred hymas - Google Patents

Description

(No Mode l.)

\ A. HYMAS.

GORE FOR GAR WHEEL MOLDS.

No. 500,500. Patented June 27, 1893.

1-; -i s I I 1 c it c INVENTORJ ALFRED HvM'As;

ATTORNEY- m: yomus PUERS co, PHOTO-LYING wASHmmnn u c UNITED STATES PATENT OFFICE.

ALFRED HYMAS, OF ALBANY, NEW YORK, ASSIGNOR OF ONE-HALF TO JACOB BROOKLEY, OF SAME PLACE.

CORE FOR CAR- -WHEEL MOLDS.

SPECIFICATION forming part of Letters Patent No. 500,500, dated June 27, 1893.

Application filed November 9, 1891, Serial No. 411,341- (No model.)

To all whom it may concern.-

Be it known that I, ALFRED HYMAS, of the city and county of Albany, in the State of New York,have invented new and usefullmprovements in Cores for Oar-Wheel Molds, of which the following is a specification.

Heretofore much trouble has been experienced in the casting of car-wheels in which the use of a core is required to produce the chamber formed between the side plates of said wheel and the trouble has been mostly occasioned by the use of chaplets for maintaining the core in its required place; said chaplets, being made of metal and placed in the mold in a cold condition, will chill the molten metal as it comes in contact with them and produce checks and cracks in the casting to impair its strength so as to render it liable to break, and from this cause great loss has been experienced.

The object of my invention is to remedy this defect, and I attain this object by the means illustrated in the accompanying drawings which, being herein referred to, form part of this specification.

In said drawings Figure 1 is a vertical section of the annular core for a car wheel through the center line, showing part of the nowel of the mold and the bottom-board for the same, said parts being provided with my invention. Fig. 2 is an inverted plan view of an annular core for a car-wheel, the same being provided with my invention. Fig. 3 is an enlarged side elevation of my preferred form of fastening device for the annular core. Fig. 4 is a perspective View of a modified form of the fastening-device for said annular core; and Fig. 5 is a perspective View of the key for securing a core provided with said modified form of fastening device.

A well-known difficulty in iron-founding is found in the tendency of cores and other articles of less specific gravity than molten iron to float upon the top of the iron when the lat ter is run into a mold, and for that reason great care and the exercise of much good judgment are required to prevent cores from rising from their proper positions and thereby rendering the casting useless; this difficulty is one of frequent occurrence in the casting of car-wheels, and is a source of great loss in both time and money, but by my invention this difficulty' is completely overcome.

As represented in the drawings, A designates a core for forming an annular chamber in a carwheel; said core is made in the form of an annulus provided with a series of supporting-teats, 1, which are fitted to be seated in corresponding depressions formed in the molding-sand which fills the nowell of the mold, said depressions being produced by core-prints formed on the pattern for the carwheel; said core is made of core-sand and baked until quite hard, in the ordinary manner of making dry-sand cores. Each of the teats 1 will surround that portion of the fastening devicehereinafter describedthat would otherwise pass directly through and be involved by the metal of the casting; each of said teats will produce a corresponding opening in the plate of the car-wheel lying at the lower side of the mold, and said openings afford access to the annular chamber, formed by the core A, for the purpose of removing therefrom the sand of said core which becomes disintegrated by the heat of the molten metal in the process of casting. In the center of each teat there is fixed a fastening device for securing the core A in its proper position in the mold; each of said fastening devices is made of sufficient length to project from the end of the teat sufficiently to pass through the nowel of the mold, thence through the bottom-board, B, of said mold, and sufficiently below said bottom-board to allow it to be secured against any force exerted by the molten metal to float the core A from its place.

As shown in Figs. 1 and 3, the fastening device 0 consists of a metal-bolt provided with a head, 2, whose diameter is sufliciently small to allow it to be drawn through the opening formed in the casting by the teats 1; the lower portion of said bolt is provided with a series of circumferential grooves, 3, which are preferably made about one-tenth of an inch pitch, the lower face of each groove being formed by a horizontal plane and the inner face being formed by an inclined surface which extends from the back of the lower side of the groove to the periphery of the plane which forms the lower face of the next groove above it. When this form of fastening device is employed, the

bottom-board B should be provided with a series of openings, 4, which will correspond in position to the positions of the fastening devices G, and which will permit the lower portions of thebolts to pass loosely therethrough. Adjacent to each of the openings 4, there is located a pair of lugs, 5, to which a detent, D, is pivoted, and the inner end of each detent is made ohisel-shaped so as to fit into the grooves 3 of the fasteningdeviees 0; said detent is provided with a slotted opening, 6, through which a pivot, 7, passes to form a fulcrum for said detent; the slotted opening 6 allows the detent aslight sliding movement in passing from groove to groove of the fastening device 0, and a spring, 8, is arranged to force each detent inwardly into said grooves. The outer end of each detent is provided with a counterweight, 9, for the purpose of normally holding the inner end of thedetent against a stop, 10, that restricts the rising movement of the inner end of said detent.

In the modified form of fastening device shown in Fig. 4-which is designated as E- the bolt is provided with a head, 11, whichis in all respects like the head 2 hereinbefore described; the lower end of said bolt is provided with a mortise, 12, which is fitted to receive a Wedge-shaped key, 13, which bears against the lower face of the bottom-board of the mold and draws the core securely to its proper position in the mold. When the fastening device last described is employed, the lugs 5, and stops 10 can be omitted from the bottom-board B.

My invention, when made in accordance with Fig. 1, is operated in the following manner: When the mold is ready for receiving the core, the core A, having the fastening devices O fixed therein during the process of forming said core, after being properly baked is inserted in the mold by pushing said fastening devices downwardly into the openings formed at the bottom of the depressions for receiving the teats 1 and through the openings 4 of the bottom-board B until the teats 1 become properly seated in the depressions formed in the mold fortheir reception; in the descent of said core the grooves in the lower portion of the fastening devices 0 will efiect a tilting movement of the several detents D until the latterbecome automatically engaged in the grooves 3 which will retain the core A at the proper position in the mold, in which grooves the detents D will engage to lock the core A in position in such manner that the latter cannot be floated by the molten metal. After the casting is completed and cooled sufficiently to allow it to be removed from the mold, the latter is turned over to obtain access to the fastening devices 0. The detents D are then drawn backward out of the grooves 3, thereby releasing the bottom-board B so that it can be readily removed from the bottom of the mold. By the extreme heat of the molten metal the gluten, or other adhesive matter, used for rendering the particles of coresand adherent to each other, will be destroyed so as to reduce the core Ato a condition where it can be easily disintegrated and offer but little resistance to the removal of the fastening devices therefrom.

What I claim as my invention, and desire to secure by Letters Patent, is

1. The combination of an annular core, a series of fastening devices temporarily secured in said core, and projecting downwardly from core-s and teats formed on the latter, and meanssubstantially as herein describedfor securing said fastening devices to the bottom-board of a mold, said fastening devices being protected from contact with molten metal by means of pendent teats which are integral with and form-supports for said core, to maintain the latterin a required position, substantially as and for the purposes herein specified.

2. The combination, with: a core, A, provided with a series of fastening devices, 0, temporarily secured in said, core and having a series of circumferential grooves formed therein, of a bottom-board, 13, having aseries of openings to receive said devices and detents, D, pivoted thereto; said detents being provided with means. substantially as described to enable them to automatically engage in the grooves of said fastening devices, as and for the purpose herein specified.

ALFRED HYMAS.

Witnesses:

JACOB BROCKLEY, S. B. BREWER.

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