US656021A - Means for retaining sand in molds. - Google Patents

Description

No. 656,02I. Patented Aug. l4 I900.

J. R. JONES.

MEANS FOR RETAINING SAND IN MOLDS.

(Appliqation filed July 16, 1899.)

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Iran STATES JAMES R. JONES, OF JOHNSTOWN, PENNSYLVANIA.

MEANS FOR-RETAINING SAND IN MOLDS.

SPECIFICATION forming part of Letters Patent No. 656,021, dated August 14, 1900.

Application filed July 18, 1899.

flasks for holding the sand in place when the flask is inverted. Heretofore the usual means employed for this purpose in foundry practice has consisted in a number of cross-bars secured within the flasks and at intervals from each other and perforated to receive numerous gaggers hung therefrom, the sand being rammed or packed between and against these gaggers, which serve to strengthen and retain it-in place. This practice, although a universal one in foundry practice, is objectionable and unsatisfactory in many respects.

In the first place, a very considerable amount of time and labor is required to properly fit and set the cross-bars and gaggers in the flask and adapt them to the particular pattern. The practice also involves the use of a large number of loose pieces,which when not in use are left lying promiscuously around the foundry and become buried up in the sand or under the flasks and other appurtenances and accumulations incident to foundry work, the result being that much time is lost in hunting around for lost pieces in particular or for additional parts when the supply becomes exhausted. Moreover, a high degree of skill is required on the part of the molder to make a mold which is clear and accurate in all its outlines, as raggedness is apt to result from the imperfection of the means used for retaining the sand. My invention is designed to provide means of simple character which avoid all these objections and otherwise greatlyfacilitate the operation of forming a mold.

To this end the invention consists in providing the flask or flask-section with a sandretaining plate or plates whose on ter contour is adapted, or approximately so, to the interior of the flask in which it is secured and Serial No. 724,293. (No model.)

whose inner contour conforms approximately or substantially to the particular pattern or pattern portion which it surrounds, so that the pattern can be withdrawn therethrough. These plates may be formed by casting or in any other suitable manner. They may be formed entirely in one piece or may be in separate pieces, as may be the most desirable or as the particular character of the mold to be formed may render necessary or most ad visable.

The invention is widely applicable to seetional molds for molding various articles, but is especially advantageous and particularly designedfor use in connection with molds for molding standard shapes and articlesthat is to say, where the same pattern is repeatedly cast.

In the accompanying drawings I have shown the invention applied to several different molds.

Figure 1 is a perspective View of a flaskcope inverted and having my invention ap plied thereto. Fig. 2 is a transverse section of a three-part flask and mold equipped with my invention, and Fig. 3 is a plan view of a circular flask provided with a sand-retaining devicesuitable for use in casting wheel-centers.

' In its simplest form the sand-plate consists of-a casting having side flanges a, perforated to receive bolts or rivets b, by means of which it is secured in the flask A, and a plate portion or portions 0, level with the bottom edges of the flask and forming the support proper for the sand. 13 designates the opening there and which corresponds in contour to the contour of the pattern. Thisopening is made a fraction of an inch larger all around than the patterns, and where strong sand is used the edge of the opening may be an inch or more from the pattern all around. It is necessary in all cases that this opening shall be sufficiently larger than that portion of the mold which it surrounds to leave a layer of sand between the sand-retaining device and the mold, and this layer of sand must be of substantially-uniform thickness. If such layer be too thin at any point, there is danger of the molten metal coming in contact with the metal of the sand-retaining device,while if the in, through which the pattern is withdrawn said layer is too thick it is unsupported and may break away. In larger molds the casting is in the form of a skeleton,havin g connecting and supporting ribs d. Instead of casting the plate may be built up in any desired manner. The plate portions 0 are provided with pins or projections C, cast therein or riveted thereto and extending into the sand to assist in holding it together. Provided with this plate it will be readily seen that a flask can be handled in any desired manner and inverted for cleaning and dusting and for placing in position for molding without danger of the sand falling out. It will also be observed that the use of the device greatly facilitates the Work of the molder, as he has simply to throw in the sand and ram it down, and tends to the production of a better mold, as indicated in the general statement of the objects and nature of the invention.

It willbe understood, of course,that the several forms of plate shown serve simply for illustration of diiferent applications and that the invention is not limited by any means to those forms, but that the shape and particular structure will necessarily vary with each different casting.

Having thus described my invention, what I claim, and desire to protect by Letters Patent, is-

1. In a mold, the combination with a vertically-separable flask-section, and a sand mold therein, of a sand-retaining device rigidly but removably secured within the said section,said device comprisingan outer flangelike frame fitting the interior wall of said section, a horizontal flange or plate portion carried by said frame and extending underneath the outer portion of the sand, and pins or projections extending vertically from said plate and plate portion.

2. The herein-described means for retaining sand in place in molders flasks, consisting of a sand-support secured in the flask and having plate portions lying horizontally therein, together with pins or projections extending vertically from said plate portions into the interior of the flask.

3. The combination with a flask-section, of sand-supporting plates secured to the interior walls of the flask and lying horizontally therein, and vertically-extending sandretaining devices rising from said plates into the interior of the mold.

In testimony whereof I have affixed my signature in presence of two witnesses.

7 JAMES R. JONES.

Witnesses:

JOHN H. KENNEDY, H. W. SMITH.

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