US1418703A - Molder's match plate - Google Patents

Description

v, 3. J. EVANS.

MOLDER'S MATCH PLATE.

APPLICATIUN FILED JUNEQ, 192).

1,418,703. PatentedJune 6, 1922.

'lNVENTORI 79'5- JUHN J. EvFlNS. BY

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ATTORNEY.

JOHN J. nvansor T.acoiyr.a,wasnrneron.

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Be it known that I, JOHAN J. EVANS, a citizen of the United States, and resident of the city of Tacoma, in the county of Pierce and State of Washington, have inventedl certain new and useful Improvements in Molders Match Plates,y and do hereby declare that the following is a full, clear, and exact description of the same.

This invention relates to improvements 1n match-plates for molding metal castingsand in the method of making the same.

The object of the invention is the provision of a match-plate frame of simple construction whereon a pattern of plasticfma'- terial,vor partially of lplastic material and partially making use of the original wood pattern, may be 'formed or secured -with beneficial results in the production of castings, and particularly in the molding o-f articles wherein an. even joint is required to be made'between the upper and lower parts of the mold-fiask.

A further object of the invention is the provision of a simple and inexpensive method of forming the desired patternA on the matchsplate frame whereby much time of a skilled pattern-maker is saved and exac results may be obtained.

The invention consists in the novel construction, adaptation of parts and combina tion of elements in a match-plate frame, together with the novel method of forming a pattern thereon, as will be fully described.

in the following specification, illustrated in the accompanyingdrawings, and linally pointed out in the appended claims.

In said drawings, Figure 1 is a perspective view of a match-plate frame embodying my invention. Fig. 2 is a similar view of the same with a pattern molded thereon. Fig. 3 is a cross-sectional view of a molderisask showing the match-plate frame in the sand, substantially as when the pattern is being molded or as when being utilized in molding similar articles in metal. Fig. 4 is a side view of the wooden pattern.

n Referring to said views, the reference numeral 1 designates a rectangular cast metal frame having a central opening with integral side walls 2, 2 and end rails 3, 3 of relatively greater width than thickness and with plane upper and lower parallel surfaces. The exterior dimensions of said frame are of the same extent as the similar dimensions of the flask with which it is designed to be Specification of Letters Patent. Pgtgugedi June 6y 1922 1921. seriai. No. 476,167.

used. 5, 5 indicate integral handles attached". i

or other equivalent device, is operatively' mounted .in each saidhandle to bear-on said posts whereby the relatively slight but necessary adjustments of the match-plate relative to the iask may b'e made.

Crossed wires 10 extend! across said' open-y -ing in vthe lframe whose ends are secured rigidly in the side. and end rails, respectively, either by' being embedded therein as the frameis cast, or in any other suitable manner.

The matchsplate frame as describedl may `be used with anyk ofi the \-u`suall forms of moldersflasks of suitabley dimensions, such as that illustrated in Fig. y3, wherein the reference numeral 11 designates the'end walls of thek lower or dragv"portion of the flask and 12the end` walls of the upper or ,cope. portion. The aforesaid.y aligning posts?? are securedto said ends l11 ofthe dragy and corresponding ears 13 are providedk f on the end `walls lof. the cope andk arey apertured to receive. the posts? to maintain ,the flask parts in aligned position.

My improved method of making the match-plate and molding a casting therefrom may be described as follows: The wooden or other pattern, see Fig. 1, from which the castings are to be made is placed in the sand 14 of the flask as ordinarily and an impression made therein. The upper or cope portion of the flask is then lifted and the pattern removed. l The match-plate frame, shown clearly in Fig. 1, yis then superposed on the drag portion of the flask,

the apertures 6 receiving the posts 7 of the drag, thereby aligning and maintaining the frame in fixedl relative position on the drag. The cope may then be replaced over the frame 1 in the usual manner leaving a space between the uppery and lower portions of the flask of the thickness of the match-plate frame. Previously the sand of the cope is formed with .a gate 15 and a riser passage 16, as well as with depressions, such as 17 and 18, which may be made in the sand of thecope and drag, respectively, to assist in the flow of the plastic material.

A plastic composition having a plaster of `Paris base is then poured into the mold exe-m made'by the lower portion of the pattern in the drag, the space within the frame l between the upper and lower parts of the flask, as at 20, see Fig. 3, and in thepattern impression niade in the cope7 as at 2l. lThe composition is allowedto set for a few minutes whereupon the frame may be taken from the mold and washed with cold water to remove the adhering sand and set in a dry room to harden for about twelve hours.

1n this condition the match-plate is ready for use with an exact duplication of the pattern on its opposite sides and is then utilized as a inatcli-plate pattern in the usual inanner. n i In sonie instancesit may be desirable, to use the original pattern itself yor the lower portion of it, as a part ofthe match-plate. ln this case that portion of the pattern `22 utilized is provided with projecting woodscrews 23 protruding thereabove the approximate thickness of the frame l. the match-plate the pattern portion 22 is left'in the sand and the screws 23 will protrude through the wires lO. lWhen the plastic material is poured it will surround the screw heads 25 and secure the pattern 22 onto the match-plate in a firm `and rigid manner. A metal pattern may be used in a similar manner by employing holding def vices analogous to the `wood-screwsQS.

When the casting .work is `finished and no further use is to be made of the match-plate,

the pattern may be released by unscrewing l the screws 23 and the plaster may be knocked out of the `frame l, whereupon the frame maybe usedagain in the same Way.

In making p additional wire.

The invention is simple in construction and easy of operation and effectsa great saving in the production of a match-plate as it does not require the services of askilled patternrnaker and takes but aisinall fraction of the time at present employed in producing such device. Y

Having described my invention, what I claim, 1si 1. A matcheplate frame consisting in a rectangular `metal frame having acont-ral opening, and a plurality of wires iiXed in the sides of said frame and crossing said opening. i

`E2. Av match-plate frame consisting in a rectangular metal body having a central n opening, yand a plurality of crossed `wires rigidly secured in said body and spanning said opening.

3. A match-plate consisting in a rectangular frame havinga central opening therein, crossed wires secured in said frame and spanning said opening, and a filling of plaster composition in said opening reinforced by said wires having a pattern of an object to'be cast formed on sides.` f

JOHN JrnvANs."

its upper and lower l

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