US37670A - Improvement in molding and casting pipes - Google Patents

Description

UNrrn Sra'rns BENJAMIN S. BENSON, OF

l rrrnnr FFTCE.

BALTIMORE, MARYLAND.

IMPROVEMENT IN MOLDING AND CASTING PIPES.

Specification forming part of Letters Patent No. 37,674}. dated February 17, 1863.

To all whom it may concern:

Be it known that I, BENJAMIN S. Bnnson, of the city and county of Baltimore, in the State of Maryland, have invented a new and useful Improvement in MOlding and Casting Pipes; and I do hereby declare the following to be afull and exact description of the same, reference being had to the accompanying drawings, making part of this specification, in which- Figure 1 is a perspective view of a flask separated in such manner as to expose the core and other internal parts. Fig. 2 is a vertical section at a; 00, Fig. 1, showing the flask coniplete and ready for pouring. Fig. 3 is a perspeetive View of the base-plate or chill-ring, hereinafter described. Fig. 4is a perspective View of a metallic anchor employed to sup 1 port and brace the center part of the core.

Similar letters of reference indicate corresponding parts in the several views. 1

l l I I My present improvement consists, first, in a device for supporting the lower end of the core; second, in a device for preventing the deflection of the central portion of small cores; third, in a device for preventing the entrance of sand, metallic oxide, or other foreign niat- I ters within the mold in theaet of pouring.

To enable others skilled in the art to which my invention appertains. to fully understand and use the same, I will proceed to describe I its construction and operation.

The flask is made in two parts, A A, formed with vertical flanges a a, and secured together either by bolts 1) or by clamps B and wedges B. The said parts are also provided at the lower end with horizontal flanges c c, resting upon an annular plate, 0, which is secured to the flange 0 by bolts 0'.

D is a base-plate or ehiltring provided at its center with an annular flange, (1, project ing upward through the central aperture of the plate 0, and constitutes a seat to support the lower end of the core E and prevent its displacement. The core E is encircled by a band, F, which is provided with studs or projeetions f f, resting against the interior of the mold, and constitutesan anchor to prevent the deflection of the center or intermediate portion of the core. This anchor is shown by a separate view in Fig. 4. It may be formed of any suitable metal, and after the casting is completed will readily separate from the core and remain in and form a part of the pipe without metallic oxide, sand, or other foreign matterv within the mold. The said combustible shield is held in position by a cope-ring, H, formed with gates h 71, through which the melted metal may pass.

In Fig. l a portion of the ring H. is represented as broken away to expose the combustible shield to view.

Operation: Theflask having been locked to gether, the interior of the mold is formed by introducing sand within the flask, in the manner described in my patents of July 30 and September 3,1861. The mold being thus prepared in any desired 1nodc,the core is inserted within it, with a sufficient number of anchors F to prevent its bending or deflection. The lower end of the core is held precisely in the center, and secured against displacement by means of the seat d. The annular shield G and cope-ring H being then placed in position, the mold is ready for pouring. The shield G effectually prevents the entrance of loose sand or metallic oxide; but when the molten metal passes through the gates h it inimediatelypenetrates the shield and enters and fills the mold. This device will thus be seen to eifectuallypre vent the mingling of sand or oxide with the metal, which is well known to constitute a common source of imperfection in the manufactured article. The seat (I being held within a plate, C,-extendin g completely around it, and attached securely to the part A of the flask, guides the lowerend of the core into an exactly central position, and so holds it without any possibility of displacement. The said annular plate-Qbeiug bolted to one part only of the di vided flask, allows the flask to be partially opened for the withdrawal of the pipe, leaving the annular plate on the bottom whole and entire, without being cut into two segments, as otherwise would be necessary if the ring were bolted on both sides of the flask. In case of the annular plate being cut in two segments and bolted under each section of the flask, a great difflculty occurs in closing the flask to prevent shifting, in which case the annular flange of the chill-ring will not fit, thus allowing the metal to escape in casting, and throwing the lower end of the core to one side of the mold, which will necessarily make the pipe thinner on one side than the other. By means of this device for holding the lower end of the core, and the anchors which secure the intermediate portions against displacement, any inequality in the thickness of different parts of the pipe is effectually prevented.

Having thus described my invention, what I claim therein as new, and desire to secure by Letters Patent, is

1. The annular flanged base-plate D d, em-

ployed in the described combination with the annular plate 0, and constituting a seat to guide and hold the lower end of the core, as explained.

2. The detachable anchor F f, constructed and applied substantially as described, to prevent the deflection of the intermediate portion of the core.

3. The shield G, employed in theinanner explained, to exclude sand, metallic oxide, or other foreign matter, and permit the entrance of the molten metal.

BENJAMIN S. BENSON. lVitnesses:

EDM. F. BROWN, CHARLES SMITH.

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