US29372A

US29372A - Improvement in casting stamping-heads

Info

Publication number: US29372A
Authority: US
Publication date: 1860-07-31
Anticipated expiration: 1877-07-31

Description

I. NV. GATES, OF CHICAGO, ILLINOIS.

IMPROVEMENT IN CASTING STAM PlNG-HEADS.

Specification forming part of Letters Patent No. 29,372?, dated July 31, 16604 iication, in which- Figure l represents a vertical central section of the flask and center piece put together ready for casting the stamp-head; Fig. 2, a similar section through the center piece detached from the flask; Fig. 3, a similar section, and Fig. 4 a plan of the stamp-head when cast onto the center piece; Fig. 5, a vertical central section of the flask and center piece ready for the casting of the die; Fig.

,6, a horizontal and Fig. 7 a vertical section of the die when cast onto the center.

Similar letters of' reference in each of the several figures indicate corresponding parts. The nature of my invention consists in the use of a hollow central chill, in combination with an external chilled Ametal flask, in the manner substantially as hereinafter described, so that the metal which, with the central chill, forms the stamp head or die may be cast in and around the central chill and against the interior surface of the external chilled flask. The object of this process is to chill the metal of the stamp head and die all through, and thus increase their durability. Stamp heads and dies as manufactured at present are chilled to a thickness of from onequarter to an inch only. XVhen this thickness is worn off the rest is very readily used up.

To enable others skilled in the art to make and use my invention, I will proceed to dcscribe its construction and operation.

I rst cast the hollow stem B of the stamphead, the lower part, Bl B3, in an iron flask, and the upper part, B B2, in a second mold, so as to chill the lower part ofthe stem, (which is to form part of the head,) and to have the upper part, or what may be properly called the stem, of the stamp-head soit, so that it can readily be turned. The stem, when finished, is placed in an iron flask, D D, as represented in Fig. 1, so that its chilled lower portion forms a center piece of the hollow space of the fiask. The molten metal is then poured through the hollow stem into the fiask so as to fill the hollow space in the fiask and stem, as represented at A A A, Fig. 3. The stem is originally cast with recesses w on its inner and recesses y on its outer surface, which are afterward filled up by the metal A A A, so that when the bottom part of thel stamp-head becomes worn off', and only aring, A A, is left around and a core, A, in the stem, this ring and core will yet be firmly connected with the stein and t for use. As the metal is cast through and around the stem, (in the above-described mannen) it is not only chilled from the outside in consequence of its contact with the inner surface of flask D D', but also from the inside in consequence of its Contact there with the center' piece formed by the lower end of the stem. Thus the metal will be chilled throughout, and will thereby be made far more durable than what the usual stamp-heads are.

I found it necessary to cast the metal through and around a hollow center piece, because on casting it around a solid stem it would invariably crack. On pouring the molten metal through the hollow center piece it heats and expands and can afterward contract together with the cast head so as to prevent its cracking. The die (Z is cast in a similar Vmanner around and through a ring-like center piece, b, which is fastened in the flask c a by pins c. The center piece, b, is made of chilled cast-iron and provided with recesses similar to the recesses .t y above described. In this manner the die is also chilled throughout from the center as well as from the outside, and is thus made to possess a high degree of durability.

That claim as my invention, and desire to secure by Letters Patent, is-

The use ofa hollow central chill, in combi nation with an external chilled metal fiask, in the manner substantially as and for the purposes herein described.

The above specification of my improved mode of casting chilled stamping-heads, che., signed by me this 30th day of April, 1860.

I?. XV. GATES.

Vitnesses:

A. D. STURTEVANT, ALvIN SALIsBURY.