US882720A - Method of producing chilled castings. - Google Patents

Description

PATENTED MAR. 24, 1908.

M. J. SOMERS METHOD OF PRODUCING GHILLED GASTINGS.

APPLIOATIOH FILED 0(7'1'.12,l907.

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THE norms PETERS co., WASHINGTON. m c.

UNITED STATES PATENT OFFICE.

' MITCHELL I. SOMERS, OF SOUTH BEND, INDIANA, ASSIGNOR TO SOUTH BEND FOUNDRY CO.,

OF SOUTH BEND, INDIANA, A CORPORATION OF INDIANA.

METHOD OF PRODUCING CHILLED CASTINGS.

Specification of Letters Patent.

Patented March 24, 1908.

To all whom it may concern:

Be it known that I, MITCHELL J. SoMERs, a citizen of the United States, residing at South Bend, in the county of St. Joseph and State of Indiana, have invented certain new and useful Improvements in Methods of Producing Chilled Castings, of which the following is a specification.

This invention relates to methods for easting articles upon the rims of which it is desired to produce a chilled surface, and has for its object to simplify and improve the means whereby such results are accomplished.

The improved method is designed more particularly for producing a chilled rim upon the exposed upper ends of the man-hole castings which are employed at the entrance of sewers, electric conduits and the like in the pavements of streets, to provide a hard surface at the portions of such structure which are exposed to the impact of the wheels of vehicles and the hoofs of horses and the like, and for the purpose of illustration, the improved process is shown in the drawings applied to the production of a structure of this character, and in the drawings thus employed.

Figure 1 is a transverse section of a flask illustrating the first step of the process. Fig. 2 is a plan view of the parts shown in Fig. 1. Fig. 3 is a view similar to Fig. 1 illustrating the second step in the process. Fig. 4 is a view similar to Figs. 1 and 3 illustrating the third step in the process. Fig. 5 is a sectional view illustrating the 4th 5th and 6th steps in the process.

The drag or lower portion of a conventional flask is represented at 10 mounted upon the base board 11, of usual construction.

12 represents a portion of the pattern of a man-hole of conventional form, and 13 represents a pattern of a chilling element, which in this instance is in the form of an annular rim, and attached to this chilling element pattern is the remaining portion of the pattern and represented at 14:, in this instance in the form of an annular rib which bears against the inner surface of the upper portion of the pattern 12.

The molding sand is indicated at 15, and is tamped around the patterns l21314, as represented in Fig. 1, which illustrates the first step in the improved process. After the tamping is completed the pattern 13 of the chilling element, together with its pattern portion 14, is removed, leaving the annular cavities 1617, as indicated in Fig. 3, which represents the second step in the improved process.

A chilling element which in this instance is in the form of an annular ring 18, is then inserted into the cavity 16, leaving the cavity 17 vacant, as illustrated in Fig. 4:, which represents the third step in the improved proc ess. The flask 10, with its contents, is then inverted, as illustrated in Fig. 5, and the main pattern portion 10 removed in the ordinary manner, leaving the complete space, including the cavity 17, vacant, as shown.

The cope member 19, having therein suitable sprues 20, is then dis osed over the flask 10, as shown-in Fig. 5, w ich represents the fifth step in the improved process. The flask and its cope are now in condition to receive the molten metal, which is poured through the sprues 20 in the ordinary manner and completes the various steps of the process. The molten metal, it will be obvious, which comes in contact with the element 18, will be chilled or hardened.

The cavity 17 it will be n0ted,forms an annular rib spaced from the adjacent edge of 'the casting when com leted, and the chilling element 18 is forme with" sharply defined corners over which the molten metal is chilled, and correspondingly sharply defined cornersare produced in the casting at the juncture of the upper face of the rib therewith, as will beobvious. In forming castings of the character shown in the ordinary mannor, by employing ordinary wooden patterns, the molten metal is liable to distort the relative soft molding sand at the corners of the rib and produceuneven surfaces, which require to be removed by chipping or otherwise before the covers can be placed in position. This is an expensive and troublesome necessity and is entirely avoided by the improved process herein described, wherein the rela-.

tively sharp corner at the juncture of the rib and wall of the casting is re roduced in the casting, thereby obviating t e necessity for chipping or otherwise treating the casting after it leaves the sand. This is an important feature of the improved process, and adds materially to the value and utility thereof. In devices of the character shown,

wherein the upper edges are exposed to the.

heavy friction incident to the traffic passing over them, the hardening of the exposed portions is very desirable, and the improved process herein described produces this har-- dened surface in a very simple and inexpensive manner. It will be noted that in producing the improved casting, the flask 10 requires to be inverted but once, and the employment of the chilling element 18 materially lessens the number of manipulations of the flask, which would otherwise be required to form a mold of the same design. Man-hole castings of the character described Weigh from 250 to 350 pounds, besides the weight of the flask and the molding sand, consequently the less handling is required in forming the mold is important, as Will be obvious, to say nothing of the liability to injury of the mold during the formation.

tioned pattern portion; fifth, placing a copeelement having suitable sprues upon the flask sixth, inserting the molten metal.

In testimony whereof I affix my signature, in presence of two witnesses.

MITCHELL J. SOMERS. Witnesses:

F. E, BURGENER, GEORGE OLTSOI-I.

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