US377009A - Sand mold - Google Patents

Description

UNITEDf STATES y PATENT OFFICE-'f s. JARvIs ADAMS, on PITTSBURG, PnNNsYnvANiA.

SAN o MOLD.

SPECIFICATION forming part of Letters Patent Nd. 377,009,1dated January 381, 1,888.

Original application filed March 31, 1887, Serial No. 233,098. Divided and this application filed October 29, 1887. Serial No. 253,750.4 v

. (No model.) f v To all whom, ifm/dy' concern: Y 1

Be it known that I, S. JARvIs ADAMs, of

' Pittsburg, in the county of- Allegheny and Serial No. 233,088,0f which application this is a division. 1

It'is well known that in themanufacture of tubular castings a much more perfect casting can be obtained when the mold is formed vertically within a single liasi'i, so that instead of there beinga longitudinal joint within the n'- ished mold along the edges of thelnold-cavit'y (asis the case where the mold is formed inL a two-part-flask, one cavity of the mold being `molded in each part thereof) a perfect mold f is formed, as the body of the mold-cavity is molded by a true cylindrical pattern. There are, however, certain classes of molds-such as those for the formation of certain classes of wagon-boxes and forgingdies-which have enlargements at each end-that is,- which have the central portion of the body of the casting of less diameter than its'ends-which have not heretofore been formed in a one-part flask, it being necessary in molding them to divide the pattern longitudinally and rmount it upon a match-plate, andv form one half of the mold in each flask, and then place the two half-molds together. n

My inventionlhasfor its object the formation of this class of molds in onepart flasks, so that amore perfect and truly cylindrical or other shaped mold-,cavity is obtained, and the liability of the formation of'iins onthe castingsuch as occur when a match-plate is employed-' is overcome.

`To this end my invention consists in combining with the mold having a mold-cavity of greaterV diameter at each end thanin thecentrai part thereof and formed in a one-part ask separate cores introduced within thev said mold-cavity Vfrom the opposite ends thereof, so as to form the mold-cavity correl inafter set forth.

, sponding to the shape of the facie ,desiree to cast. I l

' It also consists in forming these ycores of such shape corresponding to each other that the one will iit Within the other, and thus center the core passing through the mold-cavity, soas to form a proper mold for a hollow cylindrical casting, as will be more vfully here- 'Io enable others skilled in'the .art tomake and use my invention, I will describe the same more fully,freferring to tlie'accompanying drawings, in whichf f Figure 1 isa central vertical sectionfoi` one form of moldl embodying my inventiony-Fig.

2, a similar View. ofk another form Fig 3 y In forming molds embodying my invention I I prefer to employ the form of apparatus shown by me in an application tiled March 31,1887, Serial No.` 233,098; but I do notwishto eon' fine my invention to any particular formof A apparatus, as the molds may be made in other y forms. In thisapparatus the flask a isy made 'ot suitable size .and length, according tothe sizeand length ofthe patterns employed within,

the same flask. kAt the base otthisilaskis""v the pattern-block` 11,- to which the lower part, n, c, ofv the two-part pattern is secured, the up'- perv part, d, of said pattern being secured to the lower part, c, by any suitablemeans and? extending up above the flask a.

InV making .l rmy mold I prefer to connect the laskandthe patterns to the lifting and dropping'mechanism for imparting the jar through this upper pattern, cl, the pattern" having an extension,

Vas shown in the drawings, which. can either be rigidlysecured to the vertically-moving Y rod e of. vthe lifting and droppingv mechanism -f or be connected thereto by av suitable joint,

the form of lifting and dropping mechanism shown being the same as l'that illustrated in the upper part, d, of thepatter'n is connected' to thelower part, c, thereof bysuitable catches,

f, which fit within seats g, formed at the upper end of the lowerpattern, c, and secure the two parts rigidly together during the formation of the mold, the two parts being further held in line, if so desired, by one part entering within the other, asin Fig. 3, sopas to preclude the formation of afin or other imperfec tion in the casting at the junction of the two patterns, or by pins in one part entering seats inthe other part of the pattern. These catches f can be withdrawn by any suitable means operated from the upper end of the pattern, the catches shown in the drawings being mounted on levers, the handle ends of which are within reach of the operator abovethe flask, and after the formation of the mold these catches may be drawn in to permit the upper portion, c, to be withdrawn at the upper end of the flask, as indicated in dotted lines, Figs. 3 and 4.

The particularform of engaging devices between the upper and lower parts of the pattern may of course be variedras would be well known to the skilled mechanic, any suitable engaging device by which the two parts can be separated without requiring the turning of either part of the pattern, when in the sand, being suitable for the purpose.

The pattern shown in Fig. 3 is for the mold- .ing of what is known as a wagolrboxl Fig. 1, this box having anv enlargement at the base, as at c', and an enlargement at the top, as at d', while the body between these enlargements is formed of less diameter than the enlargements, and this part or body, if tapering, as shown, is generally formed as part of the lower pattern, c, though it may of course be formed as part of the upper pattern, the pattern shown being simply reversed in its position.

In forming the mold by this apparatus a pattern-block, with its part pattern o, is secured to the iiask, the upper part, d, of the pattern secured to the lower part, c, thereof, and the flask is filled with sand, a suitable reservoir, k, being preferably employed toA feed the sand to the flask and insure the uniform compacting of the same therein. The upper part, d, of the pattern is then secured to the lifting and dropping mechanism, and by means of this mechanism the flask, with its pattern, is raised and dropped upon the jarringblock Z until the sand is properly compacted within the flask. The operator then disconnects the apparatus from the lifting and dropping mechanism and removes the reservoir, leveling of the sand even with the upper end of the flask. He then disconnects the upper part,.d, of the pattern from` the lower part, c, thereof, and withdraws this part Z of the pattern vertically through the top of the mold formed as indicated in dotted lines, Figs. 3 and 4. The lower part, c, of the pattern can then be withdrawn from the mold by any suitable means-such as by dropping out of the mold-and the mold is then ready to receive its cores. In the formation of these tubular wagon-boxes it is of course necessary to employ a core extending entirely through the part of the mold-cavity in which the casting is to be formed and to center this core properly within the mold-cavity. For this purpose a seat or core-printfis generally formed at the base of the mold, as atm, this core-print being molded by the enlargement m at the base of the lower part, c, of the pattern, and the core n, when inserted,is brought to a central position within the mold-cavity by means of a corresponding core-head, n', which fits within the scat m, the core extending up through the mold-cavity and above the enlargement formed by the base d' of the upper pattern, d. the upper end of the mold, it is also necessary to employ a core, p, and the seatp for this core is formed by the portion cZl of the pattern d, which is preferably made tapering to form a tapering seat to direct the core to place. lu order to center the core n with the core p, I form a core-seat, r, within the core p, into which the upper end of the core n enters, this core-seat acting to hold the core acentrally within the cavity of the mold. After the formation of the mold and the withdrawing of the patterns, as above described, the core n is inserted within the cavity of the mold,itshead n fitting into the seat m at the base ofthe mold, and the corep is then inserted in the upper end of the mold-cavity, fitting within theseat p', and the upper end of the core n fitting within the core-seat r of the core 17 when the mold is finished.

In Fig. 4 is shown a form of apparatus used for making a mold embodying my invention, this apparatus beingsfor the formation of a mold for casting what is known as a forging-die, and the parts thereof corresponding substantially to the two parts of the apparatus shown in Fig. 3, except that a different shape of pattern is employed. In this case thelower part, c, of the pattern is connected to the upper part, d, thereof at the narrowest part of the pattern, so that each part of the pattern can be withdrawn from the moldl without injuring the same, the two parts of the pattern being connected as above described, and after the formation of the mold'the upper part, cl, is disconnected from the lower part, c, and withdrawn through the upper part of the flask. The flask is then turned over and the lower part, c, thereof withdrawn, and suitable cores, np, are inserted within seats formed in the mold, these cores being of proper shape to form the top and bottom faces of the die, the bottom core, n, being generally formed of a metal block or chill, which acts to chill and case-harden one face of the die, while the other core,p, is provided with'a suitable dovetail extension, which forms a dovetail recess in the finished casting, by means of which it can be secured to the forging apparatus. As

heretofore formed this class of molds required what is known as a four-part flask for its manufacture, and it was exceedingly diiflcult to bring all the parts in proper relative posi- In order to close T loo IIO

377,009` 'y `r s' tion, so that. the casting of this class of articles Apresented difticulties'which are entirely overcome by my improved apparatus.

' I am thus enabled, byemployingatWo-part pattern within the one-part flask, to mold the articles to be formed much more accurately y l and to overcome the formation of fins along the edges of the nished casting, while at the same time I am' enabled to form the molds more rapidly, and as all the parts are arranged so that the mold can be formed by jarring, I

am enabled to form more perfect molds, and

can employ, practically, unskilled labor for the Work.

I do not claim in this application the apparatus heretofore described, as that forms theV p Subject-matter of a separate application tiledV f by me March 31,1887, Serial No. 233,098., of

which application this is a division. y

Having now described my invention, what I claim is `mold having its cavity extending through the 1. In a' sand mold, the combination, with a one-part ask having' a mold-cavity formed therein of greater diametcrat each end than in the central`part thereof, of separate cores located in the opposite., ends of the 4mold-cawity and .closing its ends, substantially as and for the purpose set forth.

2. .In ka sandfmold, the combination,` Witha fiask, of a corelocated in oneend and extendingl Within saidmold-cavity, and a'core located in the opposite end of said mold-cavity and provided'with a seat for the' reception of the end i of the othercore, substantially as and for the purpose Set forth.

In testimony whereof I, the Said' s. .mains ADAMs, have hereunto set 'my hand. Y

- S. JARVIS ADAMS; v

'Wit-messes: y

JAMES I. KAY, Y* Y A J. N. COOKE.

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