US1777506A - Mechanism for casting annealing-box covers - Google Patents

Description

oct. 7, 193.0.

H, E, SHELDQN MECHANISM FOR CASTING ANNEALING Box covns Filed Maron 8, 1929 4 Sheetsifsheei [IllIlL .III IIJ Oct. 7, 1930.

H. E. SHELDON MECHANISM FOR CASTING ANNEALING BOX COVERS Filed March a, 1929 4 sheets-sheer lNVENTOR n 92 mgm QM mw w ME Oct. 7, 1930. H E SHELDON 1,777,506

-HECHANISM FOB` CASTING ANNEALING BOX COVERS Filed Marh 8, 1929 4 sheets-shewL s INVENTOR Oct. 7, 1930. H. E. SHELDON 1,777,506

NECIHANISM FOR CASTING ANNEALING BOX COVERS Filed March B, 1929 4 sheets-sneer 4 INVENTOR in counectionwi Patented Oct.

HARRY n.' SHnLnoN, oF PITTSBURGH, PENNSYLVANIA MECHANISM non cAsfriNe ANNEALiNG-Box covnns Application led March 8,

rIhis invention relates to casting and more particularly to collapsible core supports for sand molds employed inV connection with casting opcratioi'is7 and more especially to those employed in the casting of annealing boX covers or similar structures.

Inm

co-pendiiig application` Serial No.

345,417, filed March 8, 1929, I have described an improved method of casting annealing box covers and an object of the' present invention is to pro vide a simple, practical and rugged apparatus for use in casting annealing box covers by such method.

A further object is to provide an improved form ofcollapsible sand core-support for` p roviding a support for the sand core during the pouring ope arranged ration but constructed and so as to permit the collapse of such core after the metal has set.

These and other Vobjects which will be apparent to those skilled in this particular art are accomplished by means of the invention illustrated inthe accompanying drawings in which FigQl is a top plan view of a boX casting mechanism Vprovided with a collapsible core support constructed in accordance with one embodiment of this invention.V In order to illustrate the mold cavity I have shown in toppla-n, the flask, the mold formed Within the flask, the core frame,

with the sand core thereof suspended in proper position within the mold whereby the mold cavity is formed between the mold and the core.`

Fig. 2 is a longitudinal sectional view of the elements in this view it is ity is filledrwith molten metal.

' i shown in Fig. 1 on the line II-II thereof, but

assumed that the mold cav- It is assumed that the view is taken at the instant pouring isfinished and before the core is collapsed.

Fi 3 is a on the line sectional view in elevation taken 3-3 of Fig. 1 and. it also assumes that the mold cavity is filled with molten metal. Fig. Il is a similar to Fig.

view in some respects 3 since it is taken on the same line but the mold forming the sand core is omitted and the core supporting device is shown as it appears during the corecollaps-A ing operation.

Although the present invention is shown th a .mechanism forcasting 95%9.y Serial No. 345,416.

annealing box covers in inverted position, it will be readily apparent that the deviceis equally applicable to other casting operavided in thesand mold 6 between the mold ions. As illustrated, a mold cavity 5 is proaud a collapsible core 7. In Fig. 1, I have shown the mold cavity before actual pouring of the metal.

The device is arranged for bottom pouring and I pour through an opeiiing 8 having a single ve-rticalchannel 9 (Figs.

1 and 2) and branch channels 10 for connecion with the mold cavity at the bottom thereof and at opposite sides of one endthereof.

Since I cast the covers in inverted position, he pouring channels connect with the mold cover at a point which in the finished cover will be adjacent one end thereof near its cast from the hottest metal. homogeneous gastight tops,A for whatever op, thus insuring that the top of the cover' is This insures impurities are in the metal will rise inthe mold cavity pear in the covers to the top thereof and will apat the sides and ends.

-When thebottoms of the covers are faced oil',

of the core 7 as'soon as pouring is hose impurities which could cause porous pots are removed.

` The present invention permits the collapse iiished and the casting setslto allow the metal to shrink without setting up such strains as would occur if the core were not collapsed. This is most important in the casting of ferrous yalloys containing alhigh percentage Vof steel alloy element-S, chromium or nickel, because such for example, as of the relatively great coefficient of linear expansion.

The particular core support which has been chosen for the purpose of illustration includes wo Side members, two end members and a bottom member andy means for holding said members in core supporting position and for moving the saine `to collapse the core. The outer surface of the side members ,11, end members 12 and bottom member `13 are provided with gaggers 14 for facilitating adhe-` sion between the outer surfaces of these members and the sand forming core.

Suspended in position within the space delined by the side and end members is a box ilreframe 15. f The top of this frame is open and the bottom, which is closed, forms the bottom of the core support or rather the central section of the bottom of the core support, since the side and end members extend inwardly at their bottoms as shown at 16 and 17.

When the frame 15 is in supporting position as shown in Figs. 2 and 3, the bottom thereof lines up with the inwardly extending bottom portions of the sides and ends.V

The central frame15 is more or less rigidly l secured to a supporting frame 18, which, prior to and during the casting operation is supported upon the flask 19 within which the mold is formed. A connection between support frame 18 and central frame 15 is made by means of four rods or bolts 2() which project through the support frame 21 and through ears 22 which project inwardly from frame 15.Y A spacer casting 23, for each pair of rods or bolts 20, is interposed between the top of frame 15 and the bottom of support frame 18, so that, even though there is a considerable space between the bottom of the supporting frame 18 and the top of frame 15, a more or less rigid connection between these frames is secured.

Secured to the sides of the frame 15 adjacent its opposite ends, by means of screws 24, are vertically positioned wedgelike members 25. These members project outwardly from the side of the frame 15 and have a dovetailed connection 26, see Fig. 1, with reversely or invertedly arranged wedgelike members 27 which are secured to and project inwardly from the inner sides of side members 11.

The ends of frame 15 adjacent their centers are also provided with outwardly extending vertically positioned wedgelike mein* bers 28, Figs. 1 and 2, corresponding to wedgelike members 25, and these members 28 dovetail with the reversely or invertedly arranged members 29 which are secured to and project inwardly from end members 12.

Figs. 2 and 3 illustrate the mold support in 'expanded operative position. The central member 15 is rigidly frame 18 by means of rods 20 which carry at their lower threaded ends nuts 30 and at their upper threaded ends nuts 31.

Hold down screws 32 threaded through supporting frame 18 have their lower ends hollowed out to receive balls 33. The hollowed ends are peened over so that the balls are'retained in position, but permit the rotation of the hold down screws. These lballs bear on the top surface of side members 11 and hold these members in core supporting position.

Screws 33 which are also threaded through supporting frame 18 and are identical with screws 32 have similar ball ends bearing on the top surface of the end members 12 when the core support is in supporting position.

Positioned at the center of each end member and hinged-thereto as shown at 34, Fig.

secured to supportingA 1, is a supporting dog 34. This dog at its free end is provided with an opening 35 extending therethrough from top to bottom and adapted to receive a key or holder 36 which is formed in the manner of a pin threaded into the top member of wedge 28 and enlarged at its upper end and provided with a laterally extending slot for receiving a key 37, see Fig. 2.

When the core support is in expanded operative position, Figs. 2 and 3, keys 37 extend through slots in the key holder 36 and rigidly support ythe end members 12 pre-- venting them from moving down below such operative position.

Each of the side members 11 is provided with two inwardly extending ears 38 and each of these ears supports a rod 39. The lower end of each rod 39 is bifureated and straddlcs its ear 38 to which it is'secured by a suitable pin 40.

When the parts are assembled these rods extend up through holes or slots formed therefor in the supporting frame 18 and each rod is provided with a laterally extending slot immediately .above the spacer casting 23 for the insertion of a key 41 and a second laterally extending slot 42 is located adjacent the top of each rod.

i When the keys 41 are placed in the upper slots'42 of rods 39, the keys 37 are removed from their slots. This permits the dogs 34 to swing upwardly about their pivot pins as the support 18 is lifted, thus allowing end members 12 to move inwardly or downwardly with relation to the forward moving center frame 15. In other words, after the frame 15 is raised by the lifting of the associated support frame 18, the end and side members move inwardly or toward the center member 15, collapsing the core supports and the core carried thereby. The keys 41, when positioned in the upper slot of their associated rods, prevent the end of the rods from sliding through the slotted frame, and permit or cause the rodsl to be raised with the frame 18, when the keys contact with the upper face of the supporting frame 18.

he end and side members are so formed that when the assembly is in operative position a space is left at the miter joint between the members, and this space which is shown in'dottetl lines at 43, Fig. 1, is closed or covered by means of sheet metal strips 44. These strips are bent so as to close the corner openings and lap over the sides and ends, and are so formed as to extend'underneath the core supporting surfaces of the side and end members and the corners as shown in Fig. 1 at 43,. These are held in place by the sand forming the core and when the core is collapsed they are easily Vforced out of place.

In operation, the mold 6 is formed in a flask' inA the usual' manner of forming dry sand molds. The mold surfaces are swept Slo armena Aandthe mold baked; Thefinbldsnpport susF p ended lfrolmthe support frame \l"8 in expand ed operative position is covered witlrthe `sand core 7 and formed to the'proper con'- "w'aidly with respecttothelsideand end niem- -bers respectively. The keys'- 41 are 'p'laCedin the upper slots Lafer the red'sva: i Upward `movementof 'the' support frame 18 and een"- 'tral mold frame 15, see 4, through 'the sliding wedge shaped connec'tio'nsv oiffth'e 'cen- 1tral 'frame with the side4 and end members, causes the latter to move inwardly' into the contracted positionshown in Fig'. 4, allowing `thesand corel" to collapse permitting shrinkage ofthe casting. The keysal in thefupper slots or rods 39 providesupp'orts for the's'ide members 11 inthe collapsed position. Y

Althoiigh I have described "a specific Vferm' 'of c0re `support inmore or 'less'vdetaih itfwill be readily understood that various changes, additions, omissions 'and substitutions "can be mede thereinwithout "departing Sironi V"the spirit ofthisilnvention or'tliesco'p'e of the ap pende'd claims.' A What AI claim `as neat'T byLetters Patent is: y V 1. A collapsible 4sand core supporting frame, having separate side and"e`nd members previdedwithfinwardiy piej'eetiiigltwerfends and a vertically Vrn'o'vable" member' 'located within the space formed between the side fnd end members" and'` having afbottorn, 'which""`iii conjunction with jsaid inwardly" projecting lower elldso'fsa'd vsidefand en'd members coinpletes the suppit for the biot-tom" of saidcdre, said movable member having means disposed onits outer side cooperating with the vinner sidesof said side and end membe'rsior holdaild desireto "seenre ing said members in position.`

2. In a sand core snpport for use in casting annealing box covers in an inverted position, spaced apart sidemembers eachfhaving an in.

' wardly projecting' lower lend forming a sulpport for a portion'of the bottom 4ofthe sand core, spaced apart endmenibers-havng similar projections on their lower ends, a member located within the space bounded by the side f and endmemb'ers and adaptedto belraised from and lowered int'o position fwithin said space and having a bottom.' which when in lowered position"` fills the'l spa'ce'f'between4 lthe lower inwardly projectingf-Lends of the" side andfend members and meaiis "connectingthe central member to the side an'ldverid members andwhich isa'dap'ted whenifthe central menil ber? isfraised tef'calise tles'ide" and" end "mem-5 bers' remove inwardly ferme piirpee f 061-* flaps bottoni of the ingfthe fsupp ort; ahdthesandcore' oaiiried thereby. i i( 3. In a sand core support for use incasting i annealing 'box covers in an inverted pston,

spaced apart 'sidememberseachhaving anfinnwardly extending `lower end formlnga -sup- Vport for the bottoni ofthe sand core, spaced apart end members having fsimilar projee tions on theirl'ower ends, averticallyrmovable member located within/the space bouli'ded'by the side and endV members 'andhavinga bot"- t'omj which when in con'j linetion with thefinwardly projectinglover ends of the sideand end members, completes fthe support for the bottom of the Vandend membersand employing inclined elements `'which areVy adapted whenfthe rvertic'ally movable `member israisedto draw ,the side and endmeinbers inwardly for'tlie purposeof collapsing the supportand the'sand co'relcarriedthereby p 14. In a sandcore support ttor'vilse'jin casting annealin' i V spacedapart side `members feaehfhavinggaii ijn; wardly extending lower end foriningiasiipport `rer the botteiiil ofthe Island eo're, spaced apartendfmembershavingsiinilar prbjeetioiie entheirv lowersends, La "'rtieally' movable member locatedwithintnefsfpaee'bgimdedj'ly the side and end'nembersandhavingh bottoni whichl when Vvc'oifjiiriction 'with the'j'i wa-rdlly 'projecting' lower ends L'o'li 4theside and eiid members, eeiiiplet'es #the-support 'fr the 'sand'fcor`e,' end llneaii's"caifried partially by the vertically fnovab emember andl partially by the side andendfiieiberfi; eeiiiieetiiigfeaiafiiienibers aiidwiiierris adapt ed when the" vertically" jiefifalile y-rl'iembei-iff: reisejio' nieve the vside1endendLrrieiiilieis:iii wardly for' the prp'ose 'of eell'apsiiigftlie spl '5. A collapsible fsafnd Esippdrtingi iframe, having separatelside'and end members .and a vertically rriovabI member leated within the'y space foriiied-between theside :and end men'bers,"said veitiyeally 'In"c'valole'-ieilfi'be'"` having e beam eeeparatie-gjwah the beitem edgesfef said iside jaiiajeiid'irienib'eis and completing the' su'pp'rt off "thefbottom of 'said core,I said movable membery 'having nefs A'disposed o'n `and Vextending."i'roin its louter side andco'o 4 eratintgr withieansfdispo'sedon 4and piejeetiirg inwardly 'from the inner sides of sandfcore,` andmeans A co11n'ect' v'ing the 'verticallymovable member tothefside "tto Yiio

said side and end members, so that said side and inner members will be held in position thereby.

tioned means disposed on rand extending from its outer side for cooperating with a similar butY inverted vertically positioned means disposed on and extending from the inner sides of said -side and end members, means for lifting said movable Imember, so that said side and end members will no longer be held in 4position at their sides and at their bottom edges.

8. A collapsible sand core supporting frame, having separate sideand end members provided with inwardly projecting lower ends, a vertically movable member located within the space formed between the side and end members and having a bottom, said bottom cooperating with said inwardly projecting lower ends ofsaid side and end members and completing the support for the bottom ofsaid core, each of said side members having a wedge mounted on its inner side, said vertically movablemember having wedges mounted on and/extendingV from its outer side and dovetailing with said wedges of said side4 members for providing a support therefor. Y

9. A collapsible Y sand core supporting frame, having separate side-v and endmembersprovided with inwardly yprojecting lower ends and a vertically movable member located within the space formed between the sideand end members, saidmovable member having a bottom cooperating with said inwardly projecting lower ends of said side and end members and completing the support of the bottomvof said core, the upper portionsof said side and end members .having wedges extending inwardly therefrom, said movable member having inverted wedges extending outwardly therefrom for cooperating 1 with said inwardly extending wedges, so that-the upper portions of said side and end members will be held in position. y

A10.' A collapsible sand" core Ysupporting frame, having separate side and end members provided with inwardly projecting lower' ends, and a `vertically lmovable member located within the spaceformed between said side and-end members, having abottom, said bottom havingr inclined `edges vcooperating with similar but oppositelysloped edges of the sidefand` endv membersv and'completing the support of the bottom of the core, said movable member vhaving means disposed j on and extending from its outer side, means disposed on and extending inwardly from the inner sides of said side and end members, the latter of said means being similar to the former and cooperating therewith but having an inverted position in respect thereto, so that the upper portions of said side and end members will be held in position and so that when said movable member is raised said side and end members are no longer held in position and can move inward.

11. A collapsible sand core supporting frame having separate side and end members, a vertically movable member located within the space formed between the side and end membersr and forming the bottom of said frame, each of said side and end members having means disposed on and extending from their inner sides and cooperating with means disposed on and extending from the outer side of said movable member so that said side members will be held in position thereby, and means for additionally holding said side members in position.

12. A collapsible 1 sand core supporting frame having side and end members, a vertically movable member located within the space formed between the side and end members and forming the bottom of said frame, a supporting frame for holding said side members and said vertical members in position and for raising said movable member out of position.

13. A collapsible sand core supporting frame having separate side and end members,

`a vertically movable member located within the spacey formed vbetween the side and end members andv forming the bottom of said frame, each of said side and end members having means disposed on and extending from their inner sides, and cooperating with means disposed on and extending from the outer side of said movable member, and a supporting means for additionally positioning said side and movable members and for raising said movable member.

14. A sand core supporting frame having separate side and end members, a vertically movable member located within the space formed between the side and end members and forming the bottom of said frame, each of said side and end members having means disposed on and extending from their innersides andv cooperating with means disposed on and extending from the other side of said movable member, so that said side members will be positionedl thereby, a supporting iframe for raising said movablev member, means l.cooperating with said supporting frame for `collapsing said side members.

15. A collapsible sand core supporting frame having separate side and end members, a vertically movable member located within the space formed between the side and end members and forming the bottomof said frame, a supporting frame cooperating with said movable member for raising and lowering said member, said supporting frame co operating with said side and end members for l(Sollapsing and positioning the said memers.

16.` A collapsible sand core supporting frame having separate side and end members, a vertically movable member located within the space formed between the side and end members and forming the bottom of said frame, a supporting means for raising` said movable member and for collapsing said side and end members. Y

17. A collapsible sand core supporting frame having separate side and end members, a vertically movable member located within Vthe space formed between the side and end members and forming a bottom of said frame, collapsing means disposed on the inner sides of each of said side and end members and cooperating with means Jfor raising said movable member, so that said side and end members will be collapsed by said raising means. Y

18. A collapsible sand core supporting Y frame having separate side and end members,

a supporting means for said members having Slots extending therethrough, rods pivoted 30 to said members and positioned to slide in said slots, removable keys formed to lit on said rods, for locking the side and end members in position, and for holding the upper end of each rod in its respective slot when the supporting frame is raised.

In testimony whereof, I have hereunto subscribed my name this th day of March,

HARRY E. SHELDON.

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