US2004293A - Method of shaking out flasks - Google Patents

Description

June 11, 1935. w, F, PIPER 2,004,293

METHOD OF SHAKING OUT FLASKS Filed Jan. 20, 1954.

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f applicateurJanuary` 2o, 1934;;seria1 V somma (01.*22-1909 y I The" invention relatesl toY `shaking .the sand out fof yfoundry-1 flasks yafter the moldingIo-peration has been completed ',andwhen `the Vsand is fin a hardened-and packed condition around the castremove for prompt reuse ofthefiasks; y L f f Heretofore/ `it has been` customaryfto -shake out asks by imparting" vibrations' 'thereto l through aiied oiaspringemounted flask sup`` port? iisually containingcylinder and piston adapted to be reciprocated by uidunder pres-` sure to impart hammer blovlsfto the asksupport. V ci! `In practice, it has been' found thatwitii such a-shake out "method or "arrangement the-`cy1` inder` and the as'k support carried bythe cylirider are short-lived `on account-of the'sharp I a'ndupowerfulr hammervblows lwhich 'li'h'e'prin'xary` objectief the present invention is to provide an improved method ofv shakingout flasks in which` thefIasks 'are supported on,

and in contact With,"aj `reciinrocable hammer I which `is carriedfusually'by'a' `cylinder andto t which hammer blows are imparted 'by 1a rapidly yreciprocating `element suchas` a piston,v sothat the vibrations will `beI transmitted directly 'from f the` piston tothe hammer, and thence directly tolthe flaskf'yvithoutrimpact or blowsagainst the cylinder. In practice; it hasfbeenjfoun'd that this method re'slts'fin an I`acceleratio-nof the shake-outoperation andin expediting discharge ofthe sand from theflSkS, and also 'avoids the I necessityof `'frequently `replacing'fthe cylinder of "a part of this specification or disclosure and in v `which 'likenumerals of "reference denotecorre` the apparatus 'n Iac'count,ofu disintegration and Wear.VV I I y I I I s I `With 'this object in; viewthe 'invention con-y sists in the method"wlrich` `is hereinafter set forth, and is more particularlydefined by claims at the coricliision.` I t t n L I In" thev drawing which I accompanies and forms s I spending parts tl'iroughout the several viey'vsg` Fig. 1 is a plan view of an apparatususedn 't carrying out theimprvedmethod; I Fig: 2'is asideelevation; I s V Fig. 3 is a section of one of the vibrating devices, andA f s I I Fig. fl is an end View of the apparatus` '111e methodwhich forms the subject matter of the method contemplates the shaking out of a iiask I8 and is adapted to be carried out in an apparatus of the type and character shown in the I drawing-` This apparatus comprises a `tion I5c and `ports 25 extendv'axially'through the No; House s pair of channel beamsIU which arer adaptentto*` underlie` the flaskfand are `secured "on, thef'top` I ofja t gratingfvl Iffthi'ough which `iiliesancl `dislcharged fromthefask YI8 will `fall into apit or onto"the-floor. Apair of vibrating devices I y2` of like constructions are secured on top of and between thech'annel beams I 6, a'nd 'are positioned,`

`to underlie opposite side-railsfof fthe flaskA Ill- Each"vibrating` device comprises `a `casing I3 which: is `forr'ned With a verticalcylinder XIII 1 adapted. utoreceive I air under pressure; a piston I vvertically Yslidable in the cylinder; and atham-` in the upperr end of thev cylinder' I4 andadapted toA be impacted or Astruckubyf the` piston t kI 5, and

'an enlarged head "I 6b j positioned above 1 thefcasf s meritprqyfideaWin11a stemr isa siiqiapiyV "fateci` cf I eachv 4device isv provided? with Aintegral ylugs position on the beams"y I l).

The sides of" nasi: lss, rromltvhicn they sans pr castings areV to be" `removed. restfdirectlyp on the devices, @Theseheads lappver the tops of the `cylinders- I land normally" rest' thereon.

"construction makesfit possibleY torefstfthe'4 flask son; anddirectly to", support it by, thehammers so that the "blows'imparted `to thefhammers will` be` transmitted directlyltfthe flask Y Without havinglthe'hammersirnpact'against the cyl:

indersr@ The-topf face 'of t each head )I 6Io lisfcon l t I vexed, to permit i the rockirigj of the "flask byfth hamnjnersrespeetiveiy. 'Aber-)mwah upstand@ j ing lugs I 9? at its tends is" Welded'A to thel bearis]y I0 and extends transverselyof ythebeanfijs"III and under ther flask af sufficient v-dis'tance to lprevent the ask from; tilting transversely oft'the' heads' of the (hammers. The flask iis; connedfaga'inst displacement longitudinallyof the `beams II)y Vby vertical guide plates '2B whichl are securedr` tc` the casings' I3 respectivelyfbybolts I'I." i. t Each vibratingfdevice 'is'l operable byI fluid unasf der pres"sire,V preferablyjair, which isydelivered throngh pipe 22 Vvvhichf is `suitably connected,

' usuallylfbyl ha flexible `hose,"to1 afsource ofvlc'crn-Q bers |5215E1 and I5?. The `upper end ofthe piston is adapted to impact against the lowerv end. of the stem I6a of the hammerr I6, to` impart blows in rapid `succession to 'the hammer.. Ports 24 extend axially throughthe piston-sec- `tvvo circumferential grooves ISE*` and I5b, which form, in eiect, three piston-sections crmem- V t t the piston and a blow to the lower end of theV hammer-stem Ia. The full forceof thevblows to the piston will be transmitted through the hammer directly to the flask,because the ham'- mer is free to move upwardly, and restrained only by the weight of the flask and its contents. The air which has imparted the upwardstroke Y v to the piston will escape from the lower end of the cylinder through the ports 24 in 'the piston, groove I5a in the piston, and channel 251 in the casing,` while the .pistoni-section ll5@ closes the annular inlet channel 2te. As the piston approaches its upper limit, compressed air, in limited volume, will pass to the top of the piston through port '28, groove I5b in the kpiston and ports'2`5,lto insure the downward stroke of the piston.v Before the piston reaches the `limit of lits down stroke, port 28 is closed by piston-sew tion 15e, and piston-section I5c will uncover the inlet groove El@ toy exert air pressure under the piston and ythis cushions its down stroke to 'avoid severe impact of the piston against the casing. `vvThis movement of the piston and blows to r'the hammer are 'continuously repeated in 4rapid succession to impart vibrations and sharp strokes lto the flask.

A sheath 2li of flexible material, such as aslhestos beltinl'g, is fitted around the periphery of 'the lhead 'IGb of each hammer and depends around the outside of the 4upper portion of the wall lof the cylinder, vt'o prevent sand from. passing into 'the cylinder. This sheath is secured to the head f 'the h'anr'her by a binding Wire 3l which ties the sheath Lin an annular groove 32 in `the head of the hammer.

carrying out 'the improved method, the flask containing the sand 'and castings is -lo`wered iiiit'o `position shown in Fig. v1, so yits sides willl'contact with, and rest directly and loosely on, li'adsfl'b of 'the hammers, which are reciprocably held in the cylinder casings 13. Substantially, the entire Weight of the flask and its -cntentswill be borne bythe hammers which ae 'supported in the cylinders, so that their `i`iijijvalr`d"'Irfoveinfe'rit is retarded only by the flasks, and "will 'notV 'produce any impact of the hammers against the 'casing's Next, compressed air is upplie'd `t`o the cylinders of the vibrating devices'wli'ich'will cause the pistons I5 to rapidly reciprocate and impart a succession of upward blows to .the hammers. The strokes will be transmitted directly from the hammers to the ilask resting the'reon, and as a result, sharp blows and short lifting strokes in rapid succssionwiil be imparted to the flask, which will quickly dislodge lthe sand and cause it to be discharged from the ask. This operation will be continued until the flask is empty.

In this method of shaking out flasks, the hammer blows and strokes are transmitted directly from the hammers to the flask without passing through the cylinder casings or support. This avoids the wear and tear on the vibrators which cause their rapid destruction which occurs when the blows are transmitted through the casing or support. "The method 'makes it possible to dispense with cushioning devices which have heretofore been provided for the purpose of rect action "of the hammer against the flask reduces the time required to dislodge sand from the flask, or to shake out the mold over known methods, effectively dislodges baked sand, and avoids severe wear and tear of the vibrating devices so that the frequent replacement heretofore required -is not necessary.

`The invention is not tobe understood as restricted to the details set lforth since these may be modified within the scope of the appended claims without departing from the spirit and scope of the invention.

Having thus described the invention, what I claim as new and desire to secure by Letters Patent, is:

1. vThat improvement in shaking out llasks which consists in supporting a ask so its bottom is open to discharge sand and so that a portion of .its lwall contacts directly with the outer end of a hammer which has its inner end slidably mounted in a cylinder, and then actuating a piston in the Ylower part vof the cylinder by fluid under .pressure to impart, in rapid succession, blows to the hammer which will be transmitted `directly lto the flask to loosen the sand and discharge it from .the flask.

2. That improvement in shaking out :flasks which consists in positioning a flask so that its bottom is open'to discharge sand and a portion of the side wall thereof rests directly on Vthe upper end of 5a vertical lhammer which has its lower 'end slidably mounted, in ra cylinder, and then actuating a piston 'in the 'cylinder to impart, in rapid succession, upward blows to the hammer which will be 'transmitted directly to the flask 'to loosen the sand :and discharge it from the flask. Y y

l3, That improvement in shaking out .ilasks which consists in supporting 'a 'flask so that its bottom is open to discharge sand therefrom andportions of the side wall thereof rest .loosely but directly upon, the upper ends of .a plurality of vertical hammers `which have the lower `ends thereof vertically and independently -reciprocable in cylinders respectively, and then actuating pistons in lthe cylinders `to impart blows, in rapid succession, 4to the hammers which will beY transmitted directly vto 'the vflask to loosen and discharge the sand.

lWinnen F. PIPER,

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