US377005A - Sand-molding apparatus - Google Patents

Description

I sand around thepattern when contained within ailask, and the inventionbeing especially apl s, JARvIs ADAMsoF rITTsBURe, PnNNsYLvANIA".

SyAND-MOLDING APPARATUS.

SPECIFICATION forming part of Letters raient No. 377,005. dareduanury 31', 188e. l' i f Application filed March 3l, 1887.l

To all wwm it mag/concern:

,Be itv known that I, S. JARYIs-ADAMS, `of Pittsburg,v in the county of Allegheny and State of Pennsylvania, have invented a new and useful Improvement in Sand-Molding Apparatus; and I clo'hercbydeolare the following to be ar full, clear, and exact description thereof.

My invention relates to the manufacture of sandy molds, having special reference to that class ofmolds which are formed byjarring the plicable, though not exclusively so, kto use with the apparatus for forming molds fully described in my application for Letters Patent for sand-mold apparatus filed by lne February 9, 1886, Serial No. 191,323. In that application is described a sandln'olding apparatus having the iask, the pattern,vand patternblock secured at one end of the flask and extending up within the same, and a rod or extension connected to the pattern or its block through the flask, the sand being packed within the iiask by liftingand dropping mechanism above the flask, which engages either with this rod extending through the fiask, or

which forms this rod, and the base of which enters and engages directly with the patternl or. pattern-block, and is subsequently withdrawn from the'mold' made, thepattern being withdrawn from the opposite end of the fiask.

It is well known that in the manufacture of tubular castings a much more perfect casting can be obtained where the mold is formed verticallywithin a single flask, so that insteadof there being a longitudinaljoint within the nished mold 'along the edgesof the mold-cavity, asis the case where the mold is formed in a two-part flask, one cavityof the mold being molded in eachpart thereof, the bodyotl they mold-cavity is molded by a true cylindrical pattern, and a much more perfect mold`cavity is formed. There are, however, certain classes of molds-such as those for the formation of certain classes of wagon-boxes-which have enlargements at veach end, while the central portion or bodyof the casting is of less diam-v eter thanvits ends, which have not heretofore been formed in one-part flasks, it beingnecessary in molding this class of articles to divide Serial No. 233,098. (No'mod'elJi,

NITE STATES PATENT C)Intie113;fE

the patternlongitudinally and mount it upon in each flask, and thenfplace `theftwo half- Inolds together.

`and themolding of the samek vertically, so that r)a more Vperfect andtrulycylindrical orother` 4shaped mold-cavity is obtained and thev lia-v bilityof the'formation of fins on the castingsuch asoccurs where ay match-plate isgemployed-is overcome.

- To this end my Invention consists, generand a two-part pattern therein, thevpavrfs 0f.-

ally,`in.the'combination of a one-par tlask ka match4plate' and form one-half vof vthe mold said pattern being connected within the iiask during the formation of the mold, yand ,afterl` the mold is formed being then separatedfan'dr withdrawn `from the oppositeends of thelask,

\ whereby a long mold having.enlargementsat-- both ends .may be formed in thisone-partY flask, each part of the pattern being arranged so thatit can be'withdrawn from the finished mold without marring the sanne, so that in this way amore perfect mold-cavity is formed than where the patterns are mounted onthematch'f plate and the two parts of the lmoldformedfin l.

separate flasks.

Italsoconsists inother details of construe; tion, as hereinafter more-specifically set forth'.

'lo enable others skilledin the artto make and use my invention, I will describe thesarneA vmore fully, referring to t-he accompanying drawings, in which- Figure l is a vertical section showing a'tlask with my improved pattern therein andiconneetions thereto forimparti'ng the. jar to ther flask and pattern. f Fig. Z'Yshows-'the manner,

lof withdrawing the parts of the pattern from the one-part liask. Fig. 3 is a vertical section of the nished mold ready foricastingg, `Fig. 4 is a longitudinal section showing vanother form `of the patternr illustrating myfinvention, 4

and Fig;v 5 shows thelinished mold formedby this patternand having` the cores inserted ready for casting. A y n Like letters of reference indicate like parts in each of the figures. v v Y The ask a' is made of suitablesize and length, according to the size and length ofthe v pattern and'thenumberof patternsemployed f IOC) within the same flask. At the base of this iiask is the pattern-block b, to which thelower part, c, of the two-part pattern is secured, the upper part, d, of said pattern being secured to the lower pait,'c, by any suitable means and extending up above the iask a.

In employing myinvention I prefer to connect the flask and the patterns to the lifting and dropping mechanism for imparting the jar through this upper pattern, (Z, the pattern having an extension, as shown in thel drawings, which can either be rigidly secured to the vertically-moving rod e of the lifting and dropping mechanism or be connected thereto by a suitable joint, the form of lifting and dropping mechanism shown being the same as that illustrated in my application for patent, Serial No. l9l,323,'above referred to. In the construction shown in Figs. l and 2 the upper part, d, of the pattern is connected to the lower part, c, thereof by suitable catches,f, which iit within seats g, formedat the upper end of the lower pattern, 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, as in Fig. l, so as to preclude the formation of a iin or other imperfection infthe casting at the junction of the two patterns,or by pins in one part enteringseats in the 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 above the 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 ofthe flask.

The particular form of engaging devices between the upper and lower parts of the pattern may of course be varied, as would be Well known to the skilled mechanic, any suitable engaging device by which the two parts can be separated without requiring the turn# ing of either part of the pattern when in the sand beingsuitable for the purpose.

The pattern shown in Fig. lis for the molding of' what is known as a Wagenborg this box having an 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 apatternblock,with its part pattern c, is secured to the flask, 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 to 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 jarring-block Z until the sand is properly compacted within the flask. rlhe operator then disconnects the 'apparatus from the lifting and dropping mechanism and removes the reservoir, leveling o' 7k the sand e'ven 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 d of the pattern vertically i through the top of the mold formed. f lhe lower part, c, of the pattern can then be withdrawn from the mold by any suitable meanssuch as by dropping it out ofthe mold -and the mold is then ready to receive its cores. In the formation of these tubular wagon-boxes it is 8 of course necessary to employ a core extending entirely through the part of the moldcavity in which the casting is to be formed and to center this core properly within the mold-cavity. For this purpose aseat or copeprint is generally formed at the base of the mold, as at m, this eopeprint 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 acentral position within the mold-cavity by means of a corresponding core-head, n', which fits within the seat m, the core extending up through the mold-cavity and above the enlargement formed by the base d of the upper pattern, d. In order toclose the upper end ofthe mold it is also necessary to employ a core, p, and the seat p for this core is formed by the portion dz of the pattern d, which is preferably made tapering to form .a tapering seat to direct the core to place, and in order to center the core n with the core p, I form a core-seat, i", within the core jp, into whichthe upper end ofthe core a enters, this core-seat acting to hold the core n centrally within the cavity of the mold. After the for- I mation of the mold and the withdrawing of the patterns as above described, the core u is inserted within, the cavity of the mold, its head a fitting into the seat m at the base of the mold, and the core p is then inserted in the i upper end of the mold-cavity, fitting within the seatp, and the upper end of the core n fitting within the corefseat 1' of the core p,when the mold is finished.

In Figs. 4 and is shown another form of I apparatus embodying. my invention, this appa ratus being for the formation of a mold for casting what is known as a foi'ging-die, and the parts thereof corresponding substantially tothe two'parts of the apparatus shown in I Figs. 1 and 2, except that a different shape of pattern is employed. In this case the lower part, c, of the pattern isvconnected 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 mold without in.- juring the same, the two parts of the pattern being connected as above described, and after the formation of the mold the upper part, d,

l 377,005` y p Q3,

is disconnected from the lower part, c, and' withdrawn through the upper part of the fiask.' The flask is then turned over and the Vlower part, c, thereof Withdrawn, and suitable cores, n p, are inserted within-seats m p', formed-in the mold, these cores being of proper shape to form the top and bottom faces ofthe die, the bottom core, n, being generally formed of a metal block or ehill,.7 which acts to chill and case-harden one face of the die, while the other core, p, is providedwith a suitable dovetail extension which forms a dovetail recessin the finished casting, by means of which it can be secured to the forging apparatus. As heretofore formed this class of `molds required y, what is known as .a four-part77 ask for its manufacture, and it was exceedingly difficult to bring all the parts in proper relative position, so that the casting of this'class of arti-y cles presented difficulties which are entirely overcome by my improved apparatus.

- I am thus enabled byemploylng atwopar pattern within the-onefpart flask to mold the* articles to be formed much more accurately and to overcome the` formation kof fins along the edges of the finished casting, while at the same time I am enabled to form themolds more y i 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 p'raotically unskilled labor for the work.

for holding said parts together, whereby the l parts of the pattern are held*togetherduringv molding and released after molding, substantially as and for the purpose set forth.` f

2. In sand-molding apparatus, the combination of the `flask (t, the pattern-block oarrying the pattern c, the patterned, and engaging devices between the patterns and the-pattern d, substantially as 'andfor the purposes yset forth n 3. Iusand-molding apparatus, the combithe end of the pattern c, and suitable engagl'k nation of ythe fiask a, the pattern=block carry f l ing the pattern c, the pattern d, fitting around" ing devices between said patterns, substan'- tially as and for the purpose set forth.

lIn testimony whereof I, thesaid S. JARV'IS ADAMS, have yhereunto set my'vhand.'

Y ,s.A Mavis ADAMS; y

Witnessesz' JAMEsI. KAY, f n J. NEGLEY COOKE.

Images