US229294A - woolnoug-h - Google Patents

Description

3 Sheets-Sheet 1. G. WOOLNOIUGH.

Process for Making Pattern. Plates. No. 229,294. Patented June 29, 1 880.

3 Sne'ets- -Sheet 2.

t G. WOOLNOUGH, Process for Making Pattern Plates. No. 229,294. Patented June 29,1880.

Fig. 6*-

N-FETERs, PHOTO-LITHOGRAFHER WASHINGTON. D C

3 Sheets-Sheet 3.

G. WOOLNOUGH. Process for Making Pattern Plates. No. 229,294. Patented June 29, 1880. Fig-.3

NYPErERS, FHOYUUTHOGRAPHER, WAWWGTON, u C.

UNITED STATES GEORGE WOOLNOUGH, OF

PATENT ()FFrcE.

HALBERSTADT, PRUSSIA.

SPECIFICATION forming part of Letters Application filed October 29, 1817.

To all whom it may concern:

Be it known that I, GEORGE WooLNoUen, of Halberstadt, Kingdom of Prussia, have invented a new and useful Improvement in the Process of Manufacture of Pattern or Molding Plates used in Making Molds for Gastin g Metals, of which the following is a specification.

My invention relates to an improvement in the process of manufacture of pattern or moldin g plates with pattern attached, to be used in making sand molds for metal castings.

The method of fixing patterns suited for the purpose to the molding or flask board and of drawing them out of the sand by-the latter has been practiced for years. Subsequently the halves of a number ofpatterns were screwed to the two sides of a metal plate for the purpose of molding them and drawing them out of the sand together.

According to another method a plate is cut out or cast in such a manner as to fit around the pattern along its parting-line, (see American Patent No. 181,194 to J. B. McGune.) and thepattern is withdrawn from the sand through the opening in said plates either by hand or by means of a suitable molding apparatus.

For the purpose of casting patterns together with plates the practice has hitherto been as follows: The halves of the divided original pattern are molded into the two parts of a flask. These are then fixed together with a small space between them, whereupon the mold is filled with metal. The casting thus made is a straight plate with the pattern-halves on its two sides. There are,however,numer'ous patterns which cannot be divided into halves for the purpose of molding themas, for instance, plummer-block of a portable engine. (Represented in Figure 1.) Moreover, it is impossible to draw a metal pattern of such size and weight out of the sand by hand.

For the purpose of casting the metal pattern with plate after an original wooden pattern of this plummer-block, and for rendering it fit to be handled by a molding-machine, I proceed as follows:

In the drawings, Fig. l is an elevation of a plummer-block. Figs. 2 and 3 are views of the large flasks, showing process of making Patent No. 229,294, dated June 29, 1880.

Patented in England June 14, 1876.

the pattern-plate. Fig. at shows pattern-plate on half-flask for molding. Figs. 5 and 6 show the method of operating a pattern-plate on a molding-machine. Fig. 7 is a cross-section of the two half-flasks separated by the thickness- 5 5 pieces and ready for the cast.

The original wooden pattern M, Fig. 1, or a plummer block cast in the sand and serving as a pattern, is molded in a rather large double flask, as shown by Figs. 2 and 3. The pattern M having been taken out of the sand, a Wooden or metal frame, D, open or closed in the center, as the shape of the pattern or mold may call for, provided with two journals, k k, is placed on the face of one of the mold partssay on B, as shown by dotted lines in Figs. 2 and 3 and by full lines in Fig. 4. Previously a small quantity of sand has to be removed for the journals. Sand is then filled in around the frame D, and, after the frame is removed, made even with its top surface, and the journals are properly molded up to the middle. After this the frame D is placed on the mold part 0 and carefully adjusted by measurement, so that its position corresponds exactly with the position which it had on the mold part B. The other half of each of the journals is then molded, and the flask parts are placed together; but, for preventing the mold from being damaged, pieces of iron, 0, of the 80 thickness of the frame D, have to be introduced between the rims of the flask, so as to keep them apart the necessary distance. The casting made in the mold thus prepared will have the shape as shown in Fig. 5. The plate h of the same is curved along its line of junction with the pattern, according as the surface of the sand has to be shaped for allowing the original pattern to be drawn out.

Figs. 5 and 6 show thepattern-plate mounted in bearings with a half-flask attached, that after one half-flask is molded the pattern-plate is turned over, the molded half-flask removed, and the other half-flask attached, as set forth in patent granted to me and numbered 225,314..

It barely requires to be mentioned that the plummer-block M, Fig. 1, has been selected only as an example for explaining the described process, and that other patterns may be cast, together with plates,in a similar manner. 100

suffioient sand from the flask to mold the lower part of the trunnions; then in removing said frame; then in molding the remaining part of 15 the trunnions in the other half-flask then in placing the two half-flasks together, keeping them the proper distance apart by separatingpieces, and, finally, in filling the space in the; I

flasks with metal. I

GEORGE WOOLNOUGH. Witnesses:

FRIEDRICH DELM J. FRED DENNIS.

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