US1006449A - Sand-molding apparatus. - Google Patents

Description

W. M. DUNCAN. SAND MOLDING APPARATUS.

APPLICATION FILED APR.27, 1911.

Patented Oct. 17,1911.

2 SHBET8-8HEET 1'.

lnvanhor'z 1 WM. Duncan M W AbEY'a W. M. DUNCAN. SAND MOLDING APPARATUS. APPLICATION FILED 11mm, 1911.

1,006,449.- Patented 001. 17,1911.

2 SHEETS-SHEET 2.

Inventor: fittest WM. Duncan COLUMBIA PLANBGRAPH CO.,WASHINGTON. D. c.

WILLIAM MILLEN DUNCAN, OF ALTQN, ILLINOIS.

SAND-MOLDING APPARATUS.

Specification of Letters Patent.

Application filed April 27, 1911.

Patented Oct. 1'7, 1911. Serial No. 623,612.

To all whom it may concern:

Be it known that I, WILLIAM M. DUNCAN, a citizen of the United States of America, residing in Alton, county of Madison, and

State of Illinols, have invented certain new and useful Improvements in Sand-Molding Apparatus, of which the following is a full, clear, and exact description, reference being had to the accompanying drawings, forming part of this specification.

My invention relates to a sand molding apparatus and it has for its object the production of an apparatus of this description in which the several steps of producing a mold, compressing or ramming the sand around the pattern, and finally stripping the sand from the pattern, may be simply, efliciently, and. quickly performed.

Figure I is a view partly in elevation and partly in vertical section of my sand mold ing apparatus, the parts being in the position assumed before the sand compressing action. Fig. II is in part an elevation and in part a vertical section of the flask supporting table, the flask, and the sand compressing members, the parts being in the positions assumed after the sand has been compressed and the mold produced. Fig. III is a horizontal section taken on line III-III, Fig. I.

In the accompanying drawings :1 designates a series of upright columns and 2 is a bottom bed plate on which the columns are mounted.

3 is an upper bed plate fixed to the columns above the bottom bed plate, and 4 is a top hanger plate mounted on the columns at their upper ends. The three plates 2, 3 and 4 serve respectively as supports for cylinders 5, 6, and 7. The cylinder 5 resting on the bottom bed plate 2 contains a piston equipped with a piston rod 8 that extends vertically through the cylinder 6 resting on the upper bed plate 3. The cylinder 6 contains a piston that carries a hollow piston rod 9 through which the piston rod 8 extends, and the top cylinder 7 suspended from the hanger plate 4 contains a piston provided with a downwardly extending piston rod 10.

11 designates a top presser plate or pattern holder carried by the piston rod 10 operable in the top cylinder 7, the said presser plate being loosely fitted to the columns 1 so that said columns serve as guides for the plate during vertical movement thereof.

12 designates a table fixed to the columns 1 and located beneath the top presser plate 11. This table serves as a support for a flask 13, and in the table is a vertical opening 14 that is adapted to serve as a well or compartment in which sand may be deposited at the time that the flask is filled.

The piston rod 9 carried by the piston operable in the cylinder 6 carries a yoke or spider 15 and this yoke or spider serves as a carrier for a ram plate 16 operable in the aperture in the table 12, and the functions of which, aside from its service as a support for the sand deposited in the well of the table, will hereinafter fully appear. The ram plate carries a sprue G that extends vertically and is of a length equal to the height of the flask in which a mold is produced.

The piston rod 8 extending from the piston in the bottom cylinder 5 and through the cylinder 6 and piston rod 9 is equipped at its upper end with a pattern carrier 17 movable within the yoke or spider 15. The pattern carrier includes stools or pattern holders 18 that are operable in apertures provided therefor in the bottom presser plate 16 and 011 which patterns A are seated. The top presser plate 11 also carries patterns which are alined with the patterns A, the object in providing two sets of patterns being to produce flask sections which may be piled one above the other to form the complete flask.

In the use of my apparatus, air under pressure, steam, or other suitable fluid may be introduced into the several cylinders 5, 6, and 7 for the purpose of imparting movement to the pistons therein and consequently moving the piston rods carried thereby so that the parts associated with these piston rods, as explained, may be moved to and from their positions of service in the sand molding operations.

I11 the practical use of my sand molding apparatus, the flask 13 is placed on the table 12 and the ram plate 16 being in the lowered position seen in Fig. I, sand is introduced into the flask to fill it and also fill the well in the table 12 above said bottom ram plate. The top presser plate or pattern holder 11 is next lowered onto the flask 13, in which position it is retained during the molding operation. The pattern carrier 17 is then elevated a slight distance,-

whereby the patterns A are delivered into the sand in the flask 13 to the proper degree. The next step consists in elevating the yoke 15 and the ram plate 16 mounted on said yoke until said ram-plate engages the bottom of the flask. As the ram plate moves upwardly, it compresses the sand in the flask and beneath the flask. so that all of such sand is tightly rammed into the middle and sides of the flask and around the patterns, it being understood that this ramming and compression action is made possible by reason of the resistance afforded by the top presser plate 11 which remains immovable during the upward movement of the bottom presser plate. As the ram plate 16 moves a greater distance than the pattern carrier, it will be understood that the sand is packed tightly at the middle and sides of the flask and is comparatively loose above the patterns A.

Subsequent to the production of the molds in the flask 13 by the operations explained, the patterns A are first withdrawn from the flask by downward movement thereof, while the ram plate remains in its elevated position and serves as a stripper for the patterns, so that the molds produced by the patterns will not receive injury consequent to the'withdrawal of the patterns therefrom; and, after the patterns. have been lowered, the ram plate may be withdrawn from the sand, leaving its bottom surface and the molds true and perfect. The molds having been produced in the flask as described, the top presser plate 11 is elevated and the flask is removed from the table 12 ready for use.

It is obvious that mechanical means other than the fluid operated ones I have described may be utilized to move the presser plate, pattern carrier, and ram plate of my apparatus to and from their operative positions and I, therefore, wish it understood that I do not limit myself to the fluid operated means herein shown and described for moving these parts.

F or the purpose of showing the distinction between my sand molding apparatus and other types of sand molding apparatuses, and the merits of my apparatus as compared with those previously in use, I desire to draw attention to the fact that in sand molding apparatuses as heretofore made, there has been provision made for ramming the sand over the pattern to compress the sand uniformly throughout the mold. For the best molding results, it is absolutely necessary that the sand should be more greatly compressed around the pattern than it is over the pattern and it is compression of this nature that I provide for in my apparatus. The ram plate 16 of my apparatus not only compresses the sand around the pattern to a greater degree than that over the pattern, but also compresses the sand throughout the flask to a high degree of density, even in such flasks as are provided with cross bars, thus dispensing wlth the necessity of additional work of tamping the sand in the flasks where such bars are present, and which is ordinarily done by hand after the mold has been produced in molding apparatuses at present in vogue. The last mentioned advantage of my ram plate is due to the fact that the ram plate acts to compress the sand in its upward movement, so that the sand is made compact under any members, such as cross bars, that may be present in the flask. I also wish to further emphasize the advantage of the apertured table of my molding apparatus and the ram plate operable therein. The aperture in the table serves, as previously noted, as a well to hold a deposit of sand beneath the flask resting on the table, such as may be necessary to properly fill the flask when compressed. This eliminates the necessity of carrying out the usual method resorted to in molding apparatuses requiring the retraction or removal of the top presser member from the flask, in order that an additional quantity of sand might be placed in the flask, and a second compression of the sand to fill the flask to the proper degree and render the sand of the requisite density. It is to be further noted that the sprue C carried by the ram plate acts to efiiciently produce a sprue hole l in thesand at the time that a mold is produced, this sprue penetrating the sand on the upward movement of the ram plate and descending with the ram plate.

hole is thus made entirely through the sand with the sand compressed compactly around -it, and is'ready to permit the pouring of metal therethrough after the molds have been completed and mounted one upon another.

The sprue I claim 1. In a sand molding apparatus, a flask supporting table provided with a well aperture, a flask seated on said table above said aperture, means for closing the top of said flask, a carrier located below the flask' and provided with a pattern holder and a pattern on said holder, means for moving said carrier to locate the pattern within the flask, a ram plate surrounding said pattern holder, said ram plate being arranged in said well aperture below said pattern, and means for moving said ram plate to force sand from said well aperture into the flask after the pattern has been positioned in said flask.

2. In a sand molding apparatus, a flask supporting table provided with a well aperture, a flask seated on said table, means for closing the top of said flask, a carrier 10- cated below the flask and provided with the patterns being spaced from the middle and sides of the flask, means for moving said carrier a slight distance to locate the patterns within the flask, a ram plate below the patterns surrounding said pattern holders so as to force sand from the well aperture into the flask at the sides and middle of the flask, means for imparting agreater degree of movement to the ram plate than to the pattern holders so as to force a large body of sand into the flask after the patterns have been positioned therein.

3. In a sand molding apparatus, a flask supporting table provided with a well aperture, a flask seated on said table above said aperture, a top pattern carrier having patterns on its under side, means for forcing said pattern carrier onto the top face of the flask to locate said pattern Within the flask,

a lower pattern carrier arranged below the flask and provided with patterns which are alined with the patterns on the top pattern carrier, means for moving said lower pattern carrier to locate the patterns carried thereby in the lower portion of the flask, a ram plate arranged in said well aperture below the patterns on said lower pattern carrier, said ram plate being provided with openings at points below the patterns, and means for moving said ram plate to force sand from said well aperture into the flask after the patterns have been positioned in said flask.

WILLIAM MILLEN DUN CAN.

In the presence'of ADELE B. STRATTON, WV. L. JUTTEMEYER.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. G.

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