US377004A - jaevis adams - Google Patents

Description

(NoYMoael.) l' 2 Sheets- Sheet 1'.A

S.-J. ADAMS. A APPARATUS PoR WITRDRA-WING PATTERNS PROM SAND MORDS.

No. 877,004. Patented JAA. 81,1888or N. Pneus. Pnawtimagwmf. wmingm". n.`c.

,2 Sheets-Sheet 2..

APPARATUS P08 WITHDRAWING PATTERNS PROMSAND MoLDls. No. 377,004.

'Patented Jan. 81, 1888.

(No Model.)

APPARATUS FOVRIIWITH DRAWING PArTenNs `FROM sA'XNDiv|,o`| s`.`

y'I do hereby declare the following to be a full,y clear, and exact description thereof. I

s.` JAnvIs ADAMS, or rrrrsenne, PnnNsYLyAnrA. j' I SPECIFICATION forming part of Letters Patent No. 377,004, dtedgJ'anuary 311888. Application filed January 527, 1885. Serial No, 154,153. (No modeLl y .'l'o all, whom, if may concern.-

Be it known `that I, S. JARvIs ADAMS, of Pittsburg, in the county of Allegheny and State of Pennsylvania, have invented a new and useful Improvement in Apparatus for Withdrawiug Patterns from Sand Molds; and

Myinvention relates to lapparatus for the withdrawal orseparation ofpatterns from sand molds. The usual manner of withdrawing. patterns is to lift them out ofthe mold, the molder gradually becoming skilled, so that there is but la slight side movement of the hand, and the mold is sufficiently perfect for many articles. In machine-molding, guide apparatus of different kinds `has been employed, the pattern-plates being secured thereto and withdrawn either from the top or the bottom of the sand mold; Qbut these, on account of the entrance of the sand into the guide apparatus, will wear rapidly, and thus permit a slight side motion ofthe patterns,which willpress the mold slightly out of true shape, and where a variation of less than a hundredthfpart of an inch is objectionable, as in pipeballs, wagonboxes, and other castings, itis evident that a more perfect means of withdrawing the patterns is necessary. In employing this guide apparatus it is'generally necessary to turn the mold over to withdraw the pattern from above, and the weight of the pattern will,on the slight jarring of the mold necessary on turning'it over, cause thepattern to sag sligh tly and press the mold out of true circular shape. Hence it is desirable toiwithdraw the 'pattern from below; but 'this has heretofore been found impossible where the mold was packed by ramming or jarring. `It was also found that where the guide apparatus was employed in withdrawing the mold, on account of the slight side motion of the pattern, the sand packed inv the corners of thefpattern was liable to stick to it and be withdrawn with it, thus forming irregularities inthe mold and imperfections in the casting. By my invention' these objections to the ordinaryfguide apparatus heretofore employed are entirely overcome. f This I accomplish by separating the mold and pattern by dropping the one from the other, as I have found that'in so doing the attraction of gravitation acts perfectly to .cause a withdrawal j of the pattern withoutvin any way'injuring the, .walls of the mold or pressing it out of shape. In causing this separationlthe pattern may be dropped out of the sand mold, or the Unire Starts 'ArtNr Frama? i sand mold ,formed withinthe ask may ,be

dropped from the pattern, as is found preferable, according to the construction'of the pattern and ask. I have also provided a-y1`eld' ing bed toreceivethe pattern ormoldwhe'n dropped, ,which serves either to lowerit gradually to prevent injury or to break its fall afterit has dropped clear ofthe mold, and have provided other' apparatus found desirable in carrying out my improved methodv of'withf drawing'the patterns.

To enablethose skilled in the art toemploy y;my inventiomI will describe thefsame fully, referring to the accompanying drawings, in

whiclr- .t l

Figures l and 2 are vertical sections illus-i trating the simplestmeans of carrying onc'my"V d invention. Fig. 3 is a like viewfillustrating the means preferred byfme for employing my rinvention where .the patterns vare dropped from the sandmold. Figa 4 is a top view ot' the apparatus shown in- Fig. 3,' without thef fiask and mold and'patterns. Figs. 5,A la`.nd,6 are vertical sections illustrating the, dropping of the sapd mold and its flask from thevpattern,andFig. 7 isa vertical section showing the two-part mold so formed.' Fig. 8 is asection of a finished mold with the coresY inserted therein. Y,

Like letters of reference indicate like parts in eachiof'the figures. Y The sand molds maybe packed in any suitable manner, either by ramming, jarri`ng,"or Y f 9C 'f practiced by me being jarring, as covered by pressing, the methodA preferred and generally patents previously grantedto-me. In forming long narrow fmolds, or

moldsvpl formed in a single flask, as illustrated infFigs.

1 to 3, the patternsot4 generally extend yup intlo the flask B through a stripping-plate, c, l:fitting j ,around the pattern at `its largest diameter and acting to support'the sand mold b in the ask f when they pattern is withdrawngIn aloi'igA narrow flask the sand mold is` 'supportedfby-J the walls of the flask, and the vstripping-plate is not necessary, though generallyy desirable'.

Where a nest of patterns is employed,"as.

shown in Fig. 3,5 they arel attached "toa pat- IOO l tern-plate, a', and thus held in true line, the pattern-plate resting on thej arring or ram ming table, the stripping-plate on it, and the flask n the stripping-plate, the patterns extending up through this plate into the flask. Where but one mold is made in each iiask, as in making pipe-balls of from eight toeighteen inches diameter, the pattern rests on the molding table, the stripping-plate c fitting around it,

1o and no pattern-platebeing necessary, as shown in Figs. l and 2. The stripping-plate c is provided with suitablelips orextensions, c', to support it and the mold on the dropping-table when the pattern or pattern-plate is with-A drawn, the pattcrnplate being generally provided with like lips, a?, at right angles thereto, for carrying it to the dropping-table. The mold is dropped from the pattern when the mold is formed in two parts, b b', within aparti'- 2o ble flask, as illustrated in Figs. 5 and 6, or when the pattern or .pattern-plate is unevenly balanced, so that one side mightbe liable to drop more rapidly than the other. In such cases the mold is formed in the usual manner,

the pattern-plate a and two parts of the flask being held in proper position by suitable guides, so that the mold is properly formed.

A The pattern-plate has lips a3 to support it on the dropping-table.

3o The dropping-table d may beofanysuitable construction, that shown in Figs. l and 2 being the simplest construction, and being generally employed by me with large heavy patterns. It consists of a frame, c, supported on standards e', on which frame the strippingplate c rests, leaving the pattern unsupported, so that it will drop out of the mold. Below the point where the pattern drops is a suitable yielding bed, j", the simplest form being a 4c cushion on which the pattern drops, as shown in said figures, the cushion being a spring-mattress, sand-bag, or other yielding material. This cushion may rest on the ground, and is generally so employed with large patterns; or

it may rest on a vertically-adj usted support, g, as shownV in Fig. 1, by which the distance for the pattern to drop is regulated according to the height of the pattern.

Where a nest of molds is formed in a flask,

5o I'prefer to employ the apparatusshown in Figs. 3 and 4. In this the frame e of the dropping-table is supported on two hollow standards, e', bolted to the bottom plate, k, the frame being formed of two cast-iron boxes, the top plates, ci, whereofl extend out toward each other and form the'support for the strippingplate c, the lips or extensions c resting on the upper ends thereof. lIhe yielding bed f is formed of a platform, h, secured to guide-rods 6o fi, passing through suitable guides-boxes, i', se-

cured to the bed-plate 7c, the rods passing through the bed-plate into a pit under the dropping-table. The platform 7L has side eX- tensions, h, to which are secured the cords Z,

passing over pulleys m, and having weights Z within the hollow standards, the extension 71, also serving to limit the upward movement of the platform' by striking against the pulleys m. The weights Z are slightly heavier than the yielding bed and 4its guide-rods, and suicient to raiseit to itshighest position between the top plates, c", when no weight is placed upon it; but when the pattern-plate and patterns rest on the platform it is at once carried down by their weight, oiicring substantially no resistance thereto, the yielding bed being em` pl'oyed simply to prevent the jarring of the pattern-plate and patterns and the consequent loosening of the connections between them, or injury to the patterns or plate, and not for positively withdrawing them. To regulate the distance for` the pattern to drop, the vertically-adjustable support g extends up under the platform and is adjusted by the set-screw g', so that the platform rests on it as soon as the patterns drop clear of the mold. To prevent jar to the platform or the pattern or mold resting thereon, the support g has a cushioning-spring, n, at the upper end. This is more necessary where the mold is dropped l'romthe pattern, as illustrated in Figs. 5 and 6, to prevent the jarring and injury ofthe sand mold'. The dropping-table employed where the mold drops from the pattern is substantially the same as shown in Figs. 3 and 4, varying only in proportion according to the size of theask.

In carrying on the process of withdrawing the patterns where a single mold is made in the iiask, as shown in Figs. 1 and?, after the compacting of the mold the fiask is slid onto the dropping-table el over the cushion or yielding bedf, the stripping-plate c supporting the flask and the sand mold in the proper position to allow the pattern to drop vertically 1 out of the mold, the binding of the sand holding the pattern' in place until it is entirely-unsupported. lrIhe pattern is generally heavy enough to drop outas soon asleftunsupported; but it is sometimes held by the binding of the sand, and in that case the molder simply presses ou the rodp, extending through the mold from the top ofthe pattern, this rod being employed to give an initial movement to the pattern, when it will continue to descend by its own weight. I have found that the pattern drops vout without in any way pressing the mold out of shape, the attraction of gravitation acting rperfectly to withdraw the pattern, and the walls of the mold also forming the most perfect guide for its withdrawal that can be obtained, this guide being made each time a mold is made, and thus doing away with the wearing of the guides where any form of separate guide apparatusis employed. It is also found that the difficulty of the sand sticking in the corners of the pattern and being withdrawnby it is entirely overcome.

The sand of the mold is supported by the stripping-plate c where one is u'sed, which is removed after the mold is turned over to receive its core. As it is not necessary to turn the mold over before removing the pattern, there is no opportunity for the pattern to sag and press the mold out of shape. ThepatlOO 377,004l a if l *3 tern drops ontothe yielding bedf,and injury to it is thus prevented. Where a nest of patterns is' Withdrawn, as shown in Fig. 3 after the mold is formed it is placed on the droppingtable d, the extensions e of the stripping-plate o resting on the wtop platesi, and the yielding bed or platform is held by the counterbalancing-Weights up against the pattern-plate; The patterns thendrop out, as above described, an initial movement being imparted to them through the rod p, if necessary, and they carry down With them the yielding bed f,l their descent being checked by thev support g.v .'Ihe` ask is then turned over, the stripping-plate removed, and the cores inserted,fas shownin Fig. 8. f f When 'the mold is dropped from the pattern, where a partible mold is used, after molding in the usual manner, it is placed by hand on the dropping-table,the drag resting on the yielding platform, and the extensions a3 of thepattern-plateresting on the top plates, e2, and when the drag isreleased by the hand-itwill drop from the patternplate, as illustrated in Fig. 6, the yielding bed simply acting tol prevent injury to the mold. The drag is then ref moved,the pattern-plate and cope turned over, and the cope dropped from the pattern-plate in the same manner, when it can be placed on the drag, any core required being first in= serted, as shown in Fig. 7.

My invention has the advantages of simplicity,cheapness, adaptability to a great variety of work, and the apparatus shown, being-entirely separate from any molding apparatus, can be usedv by' several molders, even when forming molds of different shapes.

I do not claim in this application the dropping of the pattern from the mold by its own Weight and guided only in its Withdrawal by the wausof @hermit-formasthatfofms'tne f 'i subject-matter of a separate application filed by me November 1, 1887, Serial No. 253,973, i'

which is a'division of this application.

What I claim as my invention, and desire 45 to secure byiLetters Patent, isf,

1. In apparatus for withdrawing patternsv 7 V l from sand molds, the combination of a supporting-table, a yielding bed, and a Avertically-v adjustable support therefor, substantially as 5o A and forthe purposes set forth. l

2. In apparatus for withdrawing patternsA from sandmolds, thel combination of afsup-v.

porting-table, a yielding bed having suitable guide apparatus, c'ounterbalancing'apparatus, 55

and a vertically-adjustable support for said yielding bed, substantially as and for the purposes set forth.

3.' In apparatus for withdrawing'patterns'` from sand molds, the combination of asup- 6.o

porting-table,- a yielding bed` having suitable guide apparatus, counterbalancing apparatus, p and a support for said yielding'bed, having a v 'cushioning-spring aty the upper end thereof,

substantially as and for the purposes set forth. 'o5

4 VI'n anapparatusforwithdrawingpatterns r f from sand molds, the combination, Withfthe mold, of a pattern extendingfrom the base of the flask toward the to'p and vadapted andarranged to be dropped out ofthe mold, anda 7o rod extending throughlthe mold to the pattern,whereby an initial movementis imparted to the pattern, substantially as and forthe pura' ypose set forth. Y Y, Y Y

f In testimony whereof VI, vthe saidfS. JARVis 75 ADAMS, havehereu nto set my hand.

Witnesses:

JAMES I. ,'KAY, u J. N. COOKE.

s. V.nirtvis ADAMS.

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