US443686A - Frank c - Google Patents

Description

(No Model.)

F. G. STURGES.

MOLD.

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PRANK O. STURGE8, OF \VlLKES-BARRE, PENNSYLVANIA, ASSIGNOR TO THE \VILKES-BARRE MOLDING MACHINE COMPANY, OF PENNSYLVANIA.

SPECIFICATION forming part of LettersPatent No. 443,686, dated December 30, 1890.

Application filed February '7, 1890. Serial No. 339,564. (No model.)

To all whom it may concern: This practice in a measure overcame said ob- Be it known that I, FRANK C. STURGES, a jections, but was itself objectionable in that citizen of the United States, residing at the pattern being of only slightly less diam- NVilkes-Barr, in the county of Luzerne, in the eter than the inner wall of the flask, was liable, 5 State of Pennsylvania, have invented certain when in the act of descending into the flask, new and useful Improvements in Molds, of if for any reason the flask was not accurately I which the following is a specification. centered, to come into contact with the wall My improvements relate generally to the of the flask and thus occasion a breakage of 7 construction of sand molds by machinery, and the pattern orsome portion of the machinery. 6o to relate particularly to that class of sand molds When the pattern was withdrawn from the which are employed in the casting of car flask loose particles of sand, caught between wheels, and in connection wit-h, and between it and the flask,would i all upon the mold and the combined sections of which, cast iron or thus necessitate a certain amount of hand laother chills are usually employed. bor in order to perfect the mold and put it in 15 In Letters Patent of the United States No. proper condition for closing and receivingthe 360,086, dated March 29, 1887,'No. 360,119, metal; and, finally, the chill, taking its endated March 29, 1887,N0. 371,820, dated tire hearing on the sand, was liable when the October 18, 1887,-No. 408,579, dated August mold was subjected to extreme pressure to (3, 1889, and. No. 409,667, dated August 27, yield and thus cause an imperfect casting. 2o 1889,-are shown described and claimed sun I overcome all of these objections by adj ustdry methods of and apparatus for forming ingthe height of the flask wall, and the point inolds for molding car wheels, in the practice to which the pattern shall descend so that the of which methods and the operation of which pattern will under no circumstances descend apparatus,a pattern is pressed into the sand, down to the flask but to a point a short dis- 25 making an imprint, which pattern, by the tance above it. I provide a flat surfaceon same operation, rams or compresses the sand the rim of the flask and cause to be distribto therequired density. uted upon it, by suitable means, a sufficient It has been found difficult in operating the quantity of sand, and I extend the pattern so mechanism and in practicing the inventions that it will overlap the outer wall of the flask, o embraced in the foregoing patents, to bring with the result that in the descent of the pat the pattern to the precise level of the flask tern the sand on the rim of the flask is comwall, so that the chill, used in the castingof pressed to a great degree of hardness. On the a car wheel, could take its bearing on the rim compressed sand on the rim of the flask the of the flask, and thus hold the mold firmly in chill finds a firm and rigid seatwhich will not 8 5 place when it was closed and clamped to reyield when the moldis closed and clamped; no ceive the metal; thus, if the pattern did not hand labor is required to perfect the mold, descend to its proper place, the strain on the and there is no danger of breakage by reason mold when closed and clamped effected acomof the pattern striking the flask. pression of the sand under and over the chill In the drawings, Figure 1 is a central sec- 0 and thus caused an irregular and defective tional elevation of a complete mold provided casting. Again, if the pattern descended bewith a chill, and containing a casting of a low the proper point, the chill, taking its beardouble plate car wheel, which mold is of the ing on the edge of the flask, the parts of the character shown and described in United 1nold,the cope, drag, and chill, were prevented States Letters Patent No. 360,086, granted 5 5 from fitting closely together, whereby the March 29, 1887, to Joseph J. Carr, for method molten metal was allowedto escape. To overof molding car wheels. Fig. 2 is a central come these objections the practice has been sectional elevation of a flask in which the to allow the pattern, which is a trifle smaller sand has been distributed in approximately than the flask to descend into the flask a short the form into which it is to be subsequently 1o; 50 distance, and to place the chill on the comcompacted by the pattern. Fig. 3 is asimilar pressed sand inside the wall of the flask. view of the same showing a sweep in operation upon said sand. Fig. i is a similar view of the same showing a pattern in place upon the sand, and Fig. 5 is a central sectional eletion of the cope and drag flasks of a mold, which mold embodies my invention and illustrates the relationship which the chill bears to it when its parts are placed together and shows in place in the mold a casting of a double plate ear wheel.

Similar letters of reference indicate corresponding parts.

Referring first to Fig. 1 it will be seen that the sand contained in each flask is, as to its marginal portion between the matrix proper and the wall of the flask, flush orlevel with the rim of the flask wall, and that the chill bears against the rim of each of said flasks. The molds in this figure are of the character heretofore in use, and hereinbefore referred to.

In forming the mold which is the subject of my present application, I charge a walled flask with the sand or other molding material, extend a portion of the sand or molding material to and over the surface of the top of the wall of the flask, and fashion the sand contained in the body of the flask with more or less accuracy into the form into which the sand is to be ultimately compressed; I then occasion the descent of a pattern of suflicient area to extend to the outer circumference of the flask, whereby the sand contained in the flask is compressed and formed into the desired ultimate shape, and the sand on top of the flask wall is compressed into the required density to form the chill seat.

The following are the details of the operation thus briefly outlined:

The flask, A, in Fig. 2 is supplied with a quantity of sand, B, and said sand is distributed in any preferred manner within said flask to a form which is, as stated, approximately that of the final desired form. A portion of said sand covers the edge of the wall, a, as shown at b.

In Fig. 3 is shown a sweep, C, consisting of a rigid arm, 0, and a roller, 0, of corresponding outline to the arm, both designed to be mounted upon a vertically rotatable shaft,-- both of the usual and general construction and mode of operation,-and both of sulti cient length to extend over and therefore to operate upon the sand Z1 upon the rim (1, as well as upon the sand in the interior of the flask.

In Fig. l is shown the flask A and its 0011- tained sand B, and also a pattern D, of diameter sufficient to extend to the outer circumference of the flask, and therefore to operate upon the sand 12 upon the wall a as well as upon the sand contained in the flask,which pattern is shown as down in place upon the sand. The position which said pattern D is shown in the drawing as occupying, is the lowest which it is designed to reach, and the sand beneath it therefore is in the form which I herein term its ultimate form and in condition to be used in molding a wheel.

In Fig. 5 is shown a mold embodying my invention, it beingshown as holding between the cope and drag a chill E, while in the matrix is represented a cast car wheel F.

I do not herein claim or seek to cover the method of forming the mold described, as such method forms the subject of another application for patent executed by me contemporaneously with this application, and filed in the Patent Office upon the 7th day of February, 1800, as Serial No. 339,565.

llaving thus described my invention, I claim:

1. In a mold, a walled flask and a quantity of moldingmaterialdistributed and arranged to form a matrix therein and a bearing upon and extending over the entire upper surface or edge portion of the side inclosin g wall thereof, substantially as set forth.

2. In combination, a walled flask and a quantity of molding material distributed and ar ranged to form a matrix therein and a hearing upon the wall thereof, and a chill adapted to rest upon said bearing surface and supported by said bearing surface out of contact with the metal of the wall, substantially as set forth.

In testimony that I claim the foregoing as my invention 1 have hereunto signed my name this 29th day of January, A. I). 1890.-

FRANK (I. STI'RGES. In presence of--- EDWARD E. lloY'r, ALEXANDER Pn'r'rnustm.

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