US1653675A - Apparatus for forming sand molds - Google Patents

Description

Dcn 27, 1927. 1,653,675

J. T. STONEY APPARATUS FOR Fomnucfl SAND uoLDs Fild Dec. 15. 1924 s sheets-sheet 1` D@n 27,1927. 1,653,675 J. T. STONEY APPARATUS FOR FORMING SAND MOLDS Filed Dec. 15. 1924 3 Sheets-Sheet 2 ,In U eva-1011h L- GJ Dec. 27, 1927. 1,653,675

' .1.A r. s-roNEY APPARATUS FOR FOMING SAND MOLDS Filed Dec. 15. 1924 s sheets-sheet s Patented Dec. 27, 1927.

UNITED stares JHN T.` STNEY, OF CLEVELAND, OHVO.

APPARATUS FOR FORIVING SAND IVIOLDS.

Application lled December 15, 1924. Serial No. 755,864.

`This invention relates to apparatus for forming the sandinolds in accordance with the method disclosed in my cin-pending application Serial No. 7325358, liled Aug. .16, 1921-1-, and has for its object to facilitate the liaiidling of the ""lasls in which the sand niolds are formed so that the interval hetween successive mold forming operations may he shortened. i n

More specific objects of the invention are to provide means for quickly freeing the flask from the follower whichy rests upon the body of sand in the .flask during thefforining operation and to provide meansfor facilitating the placing of flashs upon the table prior to the mold forming operation and for facilitating the removal of the flasks after the mold forming operation.

lV ith the above and other objects in view the invention may he ,said to comprise the apparatus as illustrated in the accompanying drawing hereinafter described and particularly set forth in the appended claims, together' with such variations and modifica.- tions thereof as will he apparent to one sliilled in the art to which the invention appertains. Y

Reference should he had to the accompanying drawings forming a part of this specilication in which Fig. 1 is a central vertical section take-n on line 1 1 of Fig, 2; Fig. 2 is a top plan viewwith the platen supporting arm hrolen away and the platen omitted to show the top of the table: Fig. 3 is a transverse vertical section takeny on hrolien line 3-3 of Fig. 2.

Referring to the accompanying drawings, the flask supporting table 1 provided with a hollow supporting pedestal 2 in which is mounted averticalicylinder 3 which has a vibrating piston 4; which reciprocates vertically between the upper and lower heads' its support.

each upward stroke. The percussion member 8 has va fluid tight tin vthe head 5 and is provided with an enlarged head 9 which rests upon the top ofthe head 5 and hears against the flower ends of table supporting posts 10 which are rigidly connected to the supporting table 1. The outer edges ofthe table 1 rest` upon the upper edges of the wallsof the hollow supporting pedestal 2 and means are preferably provided for yield* ingly holding the tablev 1 in engagement with To this end the tah'le'is provided adjacent the edges thereof with downwardly extending pins 11 which have a slidinglit in vertically disposed bosses 12 formed upon tl'ie inside or the walls of the supporting pedestal 2 and the table is yieldingly held in engagement with the supporting pedestal hy means of compression coil springs 13 which are interposed lieti een the 'lower ends of` the bosses 12 and nuts 14 upon the lower ends of the pins l1. In forming the sand molds, a flask containing the sand to which the mold is to be `formed is placed uponthe table 1 and the compacting of the sand vin the flask` is accomplished by admitting fluid pressure to the vibrating cylinder 3 which causes` the piston 4 to reciprocate rapidly and'` to inipart percussive impacts in rapidsuccession to the percussion member 8 and through the supporting/posts 10 to the table 1. `The vihrations dueto these impacts are transmitted through the table 1 and fthe flask ythereon tothe sandwithin theflasl. These apidly succeeding impulses in an upward direction cause; the sand `to rapidly se'tt'le-aiid form itself into a compact mass. i

ln order to cause the sand to he more uniformly compacted throughout the entire mold, a follower in the `form of a platen resting upon the top of the ysand in the flask is provided. The present invention `provides afollower so mounted that it may he eas-ily and quickly/lifted out of flask engag-V ing position and moved laterally to `a position clear of the flask to facilitate removal of the liasks afterthe mold' forming' operas tions. `For supporting the follower a hol.

low cylindrical standard 15 is `mounted 4alongside the supporting pedestal 2 and rigidly connected thereto hy a hollow connecting portion 16 so thatv the interior .of the i `member l5 ips-in communication with the interior ofthe hollow pedestal2 for ya purpose which will he hereinafter described. i

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lateral movement.

The follower is mounted Jfor vertical movement upon the supporting member l5 and comprises a head 17 slidably supported upon the supporting member, an arm 18 rigid with and extending laterally from ,the head 17 and a platen 19 which is rigidly secured to the platen at the .center thereof and adjustably secured within the outer end of the arm 18; The platen 19 is formed to tit within the flasks in which the sand molds are to be formed and the entire follower `moves downwardly' by gravity during the mold formino operation. y

The head 1l. is provided with aldepending sleeve 2O which tits slidably over the cylindrical supporting member 15 and with an integral inner Sleeve 21 which has ,a fluid tight sliding lit upon a cylindrical extension 22 of reduced diameter which is rigidly sew cured to the upper end of the supporting A ost 15. A vertical shaft 23 is secured within the cylindrical extension 22 and extends through the upper end ol the head 17 and fluid tight connections between the shaft 23 and the interior of the cylindrical member 22 and between the shaft 23 and the upper end of the head 17 are made by suitable glands 24 and 25. The pressure for lifting the head 17 is admitted through an air pipe 26 which communicates with inlet and exhaust pipes controlled by suitable valves (not shown) so that the head may be raised or lowered. An air chamber 29'surrounds the shaft 23 within the cylindrical member 22 above the gland 211 and an air passage 29a within the wall ot' the standard 15 communi- Cates withthis chamber. An air passage 30 extends from the air chamber 29 to the upper end oit the cylindical member 22 to admit pressure between the upper end thereof and the head 1T to elevate the head 17, the space betweenthe upper end of the cylindrical member 22 and the head 17 forming a pressure chamber so that when' air under pressure is admitted through the inlet pipe- 26,` the follower is'lifted bodily.

. lVhenever the air pressure is released, the follower may move downwardly by gravity,

the i air pressurebeing employed merely to litt the follower outof flask engaging position to permit it tobe moved clear of the flask. l/Vhile the follower is in Vflask engag ing position and during y the downward movement of the platen in the tlaslt it is desirable that the follower be held against To this end the lower portion of the linner sleeve 21iof the head is ,connected with the outer portionthereot by means of integral ribs 31 and secured to the underside ot the ribs 31 is an annular `plate 32 which is concentric with the pivotal axis of thehead.` A vertical pin 33 is rigidly sef cured to the base portioniof the cylindrical extension 22 and fits in an opening m the plate 32. The pin 33 is et' alength such that `der 3.

it will hold the follower' against lateral swinging movement until the platen has been moved to a height such that it wholly clears the flask whereupon the plate 32 will be freed from the pin 33 and the follower is tree to swing laterally. After the follower has been swung laterally and the air pressure released, the plate will rest upon the top et thepin retaining the 'follower in elevated position. Then another flash has been placed upon the table the follower may be swung back to position the platen over the flask in which position the opening in the plate 32 will register with the pin 33 permitting the follower to descend by grav ity until the platen lt) rests upon the sand 'in the flask.

In order to facilitate the placing et the laslrs upon Vthe table and the removal ot the flasks therefrom, means are In'ovidcd lor lifting the flask and :'unnjiortinol the suino above the surface otthe table. .lhe tlask litting'means is actuated by means oit a 'vertically disposed fluid pressure cylinder with in the lower portion ol the hollow staruflard lo, the cylinder comprising `telescopically connected inner and outer cylinders 311 and lul 35. rllhe inner cylinder' 34. is lined to the i base ot the standard und the outer cylinder 35 has a sliding .fit upon the cylinder 3l, the cylinders 3l and 35 having closed heads at their upper ends forminga pressure chamber to which air under pressure may be adniitted through an inlet pipc 3o which extends through the inner cylinder 3l. Then air under pressure is admitted through the pipe 3G the outer cylinder 35 is liit'ted and the upward movement ol the outer cylinder is limited by means et u yielding bumper 3l' which has a vertically extending stem lill rigidly seemed to the head el the cyliiuler 35 and a spring 3S) interliosed between the head 35 and a washer 33 held in place on the stem by a nut 33 at the upper end of the stem. The lower end ot the shaft 23 is in the path o'l movelnentoil" the stem liti and is provided with a recess et() at its lower end which is large enough to receive tllenut 33') at the upper end ol" thestem. Upon up ward movementol the cylinder the nut 38" enters therecess at) and the lower end et the shatt- 23 engages the waslurr 33 compressing the spring 30 und `gradually bringing the cylinder to a stop, the sprmg 3 and washer 33' providing a` yielding abut et which is rigidly secured to the cylirulei and the arms ot which extend through the hollow portion 1G `into the hollow pedestala` lili) 2 upon opposite sides ot the vib ator cylin Rigidly attached to the arms of the trame 141 beneath the corners ot the table tif) are outwardly extending angle brackets 42 which are detachably secured to the arms ot the 'frame 4l by studs 43 which engage in suitable openings formed in the arms ot thc trame. rllhe outwardly projecting` flanges of the angle brackets 42 have rigidly secured thereto vertical pins 44 which extend upwardly and have a sliding lit within bosses 4o termed `in the walls ot the pedestal 2, the upper ends ot the pins 44 being movable through openings in the table l. Each' ot the arms ot the tramelll has rigidly secured thereto a vertical guide pin 4G midway between the pin supporting brackets 42 and these guide pins have sliding engagement with bearing members 47 in thetable sup porting` trame. Additional guide pins 48 have their lower ends slidably mounted in openings in the arms ofthe 'trame'4l alongside the guide pins 46 and these pins are supported by nuts 48twhich rest' upon the top oit the arms, the pins 48 being guided in bearing members 49 .in the lined frame the vupper vends of the guide pins 48 being connected by a cross bar 50 extending` across the top ot the vibrator cylinder lVhen air 'is admitted through the inlet pipe 36 to the chamber between the inner' and outer cylinders 34 and 35, the outer cylinder 35 together with the 'trame 4l and the flask litt ing pins 44 are elevated as a unit, the extent ot vertical movement being limited by the engagement ot the yielding butler washer SeilY with the lower end ot theshaft 23. llVhen the air pressure is released :trom the cylinder, the outer cylinder. 35 drops `by gravity andthe lower edge thereofrests upon the base oit the supporting standard 15 and in this position the upper ends of the t fi lifting pins 44 are substantiallyliush with the top surface ot the flask supporting table so that the flask rests directly upon the Vllat table. fitter the mold hasbeen formed in the tlask and the follower has been moved to a position clear ot the tlaskpressure is admitted tothe inlet pipe 3G to the pressure chamber between the cylindersS/st and 35 causing the cylinderl and with it the trame 4l and pins 44 to be elevated a short distance to litt the Hask clear otthc supporting table 'l so that the operator can conveniently li'l't the flask ,trom the table and place another tlask upon the ln'ojecting pins 44 whereupon the pressure will b'e released lrom the lifting cylinder and thetlask will be lowered onto the table. The platen will then be swung to a position `directly above the tl where the guide pin will enter the opening in the annular' plate 32 and the platen vwill be lowered by gravity into if; gement with the sand in the llask whereupon the vibrator will be operated to impart pero pact the sand in the flask. .p y

Having described my invention, I claimve impulses to the tableito'con'iy flask.

2. In a sand mold forming apparatus, the combination with a flask supporting member havingmeans associated therewith torim parting percussive' impulses thereto, of a gravity actuated follower including a platen adapted to rest upon the sand' in a llask, and-means lor supportingsaid platen lior bodily movements vertically and laterally to a position clear ot a llask on the supporting member.

lna sand mold forming aparatus, the combination with a flask supporting member having means associated therewith tor impart-ing percussive impulses thereto, ol a gravity actuated :follower comprising a head mounted at one side ot said supporting` .menih r tor vertical inoveinents and for pivotal movements about a vertical anis, an arm rigidly connected to the head and adapted lo extend over the table and a platen carried by said arm adapted to rest upon the sand in a flask.

4. In sand mold forming apparatus, the eombinatioi'i with a tlask supporting table having means associated therewith tor imparting permissive impulses. thereto, ot a tolT lower above the table engageable with the sand in afflask, means tor lifting the follower, and means for guiding the follower ver ticallly, said guiding means permitting latmovements ot the follower ai'ter it has been elevated a predetermined amount. y

5. In a sand mold vliorn'iing apparatus, 'the combination with a flask supporting table having means associated therewith :tor iniparting percussive impulses thereto, oiz `a gravity actuated 'follower above the table including a platen adapted to rest on the sand in a. flask and mounted tor movement toward and from the table and 'tor lateral movement to a position clear ot the mold, means vtor litting the 'tollower Ato a position clear ot a flask, and means i'or prevents ing lateral movements ot the l'ollower while in mold engaging positions and for retains ing the follower in elevated position a't'ter the same has been moved laterally.

6. ln sand mold 'forming apparatus, the combination with a tlaslr supporting table having means associated therewith for Aimparting` -percussive i .pulses thereto, of a `vertically movable gravity actuated )follower `comprising. a l'iead mounted tor vertical n'ioveinentatone sideotthe table,` an armV .carried by thehead and extending over the table and a platen carried bysaid arm;

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7. In sand mold forming apparatus, the combination with a flask supporting table having means associated therewith :tor imparting pereussive impulses thereto, of a vertically movable gravity actuated f'ollower comlirising a head mounted Yfor vertical movement at one side of the table, an arm rigidly connected to the head and extending over the table, a platen carried by the arm, and means tor lifting the follower to raise the platen clear ot a` flask on the table.

8.` In a device of the character described, the coi'libination with a table, oil a vertically disposed cylindrical guide member at one side of the-table, a follower having a platen adapted to be positioned over the table and a supporting head provided with a hollow cylindrical. portion slidably and rotatably mounted upon the guide member, said cylindrical portion of the head having ayclosed upper end and forming with said guideA member a pressure chamber, and means for admitting fluid under pressure to said chanr ber to li't't the platen. y

l). In a device ot the character described, the combination with a table, of a vertically disposed cylindrical guide member at one side ol the table, a tolltnver comprising a head slidably and rotatably mounted on said guide member, an arm rigidly connected to said head and adapted to extend over the table, a platen carried by said arm, and auxiliary guide members for preventing pivotal movement ot the head during downward movement thereof'. l

10, In a device of the character described, the combination with a table, of a vertically disposed cylindrical 'guide member at one .side of the table, a follower comprising a head slidably and rotatably mounted on said guideinember, an arm rigidly connected to said head and adapted to extend over the table, a platen carried by said arm, a'vcrtiral guide pin at one side ot' said cylindrical guide member, and an annular plate fixed to the head and concentric with the cylindrical guide member, said plaie having an openin',giu which said guide pin has a sliding lit.

11. In sand mold tm'n'iing apparatus, the combination with a fla-sk supporting table having means associated therewith for im- `1'airting percussive impulses thereto, ot vertically movable pins adapted to be moved upwardly through openings in the table to engage and litt a flask `oft the table, and means for simultaneously operating said pins. i

In sand mold forming apparatus, the combination with a flask supporting table having means associated therewith for imparting percussive impulses thereto, of a fluid pressure cylinder having avertically movable part, a rigid frame fixed to,` said vertically movable part, and lvefrtical pins fixed to said :trame and movable through openings in the table to litt a flask oft the table.

13. In sand mold forming apparatus, the combination with a flask sul'iporting table having means associated therewith for iu1 parting percussive impulses thereto, ot' a fluid pressure cylinder having a vertically movable part, means for supplying fluid under pressure to said cylinder, means for limiting the upward movement oit said'inow able part, a rigid frame fixed to the mov able part and vertical lifting pins lifted to said :trame and movable through openings in the table to li'lt a flask ull' the table.

ist. In sand mold forming apparatus, the combination `with a flask sulnjiorting table having means associated therewith lor im-` parting percussive impulses thereto, of a gravity follower adapted to rest upon the sand in a flask, means for lifting the follower clear ofthe flask, and means for lifting and supporting a flask clear of the table. i y

15. Inv sand mold forming apparatus, a flask supporting table, a fluid pressure operated vibrator cylinder beneath the table centrally thereof` for imparting percussive impulses thereto, a fluid pressure` cylirnlcr at one side of the table having a vertically movable pressure `actuated part, a rigid trame carried by said movable part, said trame having arms straddling said vibrator cylinder, and vertical pins carried by said arms and adapted te be raised through openings in the table to lift a flask oil the table. y y

16. In sand molding forming apparatus, a flask supporting table, means for imparting percussive impulses to the table comprising a vertically disposed fluid pressure operated vibrator cylinder beneath the table at the center thereo'l, and means lor lifting the flasks'ol'l' the table, comprising a frame arranged beneath the table and having side members straddling said cylin der, spaced vertical pins carried by" each side member ot the trame and slidable in openings in the table, and' means 'l'or rais associated with `said frame, and fluid pressure ope `ated means .for lifting said frame. 18. In sand mold forming apparatus, a flask supporting table, means for imparting percussive impulses tothe table comprising y y U ll lll

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:1 vertically disposed fluid pressure operated vibrator cylinclerbeneeth the table at the center thereof, si vertically disposed Huid pressure cylinder at one side of the table, seid cylinder having` an inner fixed member, and an Outer movable member having` n skirt portion which has n sliding lit upon said inner member and means for admitting pressure to the cylinder to lift said outer l member, ar rigid U-eliapecl frame having iis bese portion seeurel to said outer member and its arms streddling said vibrator cylinder, and spaced vertical lift pins lixed to each of said arms and adapted to be projected through openings in the table to lift a flask olf the table.

In testimony whereof, I hereunto my signature.

JOHN T. STONEY.

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