US1348982A - Collapsible core-bar - Google Patents

Description

R. G. COATES.w COLLAPS'IBLE CORE BAR. AP'PIICAIION FILED JUNE 7. I9I9.

f z f o f a 0. QN. 4 m fm .m @I .W J .a M mf. la qm dw I I I I I I I II D1 I I I I I I I I I I I I I I I II R. G. COATES.

l im Patented Aug. 10, 1920,

SHEETS-SHEET 2.

R. G. COATES.

coLLAPsiBLE CORE BAR.

APPLICATION FILED JUNE 7, 1919. 1,348,982, A Patented Aug. 1G, 1920..

3 SHEETS-SHEET 3.

(Inclusi) Unirse fsrArns rn rana" Aoraree.

YRAY er. eoATEs, or rssnnnnn, cALIFoRNIA, nssreNoR To VALLEY MOULD ANI IRON CORPORATION, or -sHARrsvjLLn IrnNNsYLvAN,IA, A CORPORATION I NEW YORK.

ooLLAPsIBLn conn-BAR.

Specification of Letters latent.

Patented Aug. 210, A1920.

To all whom t may concern.'

Be it `hnown that I, Rar GyCoArns, a citi- Zen of the UnitedStates, and a resident of the city oiY Pasadena, in the county of Les Angeles, State of California,`have invented new and useful linprovemens in Collapsible Core-bars, of which the following isa speci fication. v

This invention relates to metal founding,` and pertains particularly to certain improvenients in collapsible core bars ofla sort designed for use in the production of large and substantially uniform castings in which it is desirable to employ a core of considerable size, such as steel ingot molds.

` is well vn in the art, it is custo cast ste-ei ingot molds and similar castings inlarge numbers of substantially uniform size and shape. To contribute to eiiiciency in the manufacture of such rarticles, it has been customary in the art to employ various forms of core bars or core barrels `which are used repeatedly,'and form part of the permanent equipment of the plant. By the use orn such devices the provision of cores is a very simple matter it requires merely supplying vrthe permanent core barrel with a facing of clay wash, green sand, or other suitable material.

in the use of devices of this sort heretofore, however, dii'ieulty has been experienced in strip ping the core from castings in which there is little no draft for the core. This is due to the fact hat in cooling', the metal forming the castingy shrinks tightly on to the core, and .the heat from the metal prior to the shrinking' of the casting, bales or vitrifies the facing material, rendering it substantially incompressible, and, While ,under the compression between the casting and the core barrel, highly refractory and substantialiy non-friable. Numerous attempts have been made to accommodate core barrels to these conditions by rendering them collapsi- `ble to a greater or less extent, so that in the operation of drawing; the core the pattern walls thereof will be moved inwardly away fromfthe casting' to permit the lengt tudinal withdrawal of the device. ln some ceses attempts have been made to produce the inw: movement ofthe pattern walls by ,screw novices. in other instances the pattern walls have been ai'i'angredrto swing; on links conne'` ted to a central supporting member. ln a number of instances the pattern wallshave been supported on wedges or inclined planes arranged on a central supporting member in such fashion that relative longitudinal movement of the central member and pattern walls would cause inward and outward movement of the latter. in the use of devices heretofore which have been of suihciently simple construction to withstand ordinary sliep usage, experience has shown that the use of considerable force, applied especially for that purpose, hasbeen necessary'to effect the collapsing' of the core bar. This has been due to the binding' of the pattern walls upon the supporting wedges or supportinglinlrs, under the heavy pressure imposed by the shrinking of the casting', and to the i'illingup of necessary clearance spaces between relatively movable portions of the pattern wall by the baked facin` materia-l.

lt is'the'purpose of the present invention toA provide an improved core bar construction wnich will obviate these various defects existing in prior devices, Vand which will contribute, furthermore, to efiiciency in manufacture by being practically automatic in all of its operations, remain assembled at all times, susceptible of use in both upright and inverted castings, and possessed of other and further advantages.

' More specifically stated, myinvention eontemplates among` its objects the following: rlhe provision of a collapsible core bar wherein the clearances necessary to permit the collapsing movement of thepattern walls are so disposed as to be entirely protected from clogging by the facing` n'iaterial or the iiuid metal.

he provision of a collapsible core bar which operates automatically in either kupright or inverted position to properly posi tion the pattern walls for the reception and sustainingof the face material.

To provide a collapsible core bar which will operate automatically to sustain the ferro-static pressure of the fluid nietal during` ythe pouringv of the casting', and to accommodate theshrinkingj of the casting at its setting', so that the casting will not bind upon the core.

To lprovide a collapsible core barkwherein the collapsing movement of certain portions ofthe pattern Wall precedes such movement of other portions thereof, the portions first moving clearing space for the movement of the later moving portions.

To provide a free arrangement of movable connecting members between the various parts of the device, in such fashion that there will be no binding of such members when the casting shrinks on the core.

To provide a collapsible core bar which is very strong and simple in construction and adapted to withstand the customary rough usage, and such a core bar in which simi-4 larity lof several parts contributes to low cost f tween the contacting wall sections the parts Other objects of the invention will be in manufacture and repair.

pointed out hereinafter in the specification and appended claims, or will be obvious therefrom or from the accompanying drawings forming part of this specification.

Bef-ore describing the single illustrative L embodiment of my invention which is shown in the drawings, l will explain that the vinvention contemplates the provision of a suportinw nedestal member which occu ies a lcentral or axial position in the device and,

.forms a support fora plurality of pattern ,wall members. These pattern wall members are of plate-like form, and are movably supported for movement both longitudinally and inwardly and outwardly relative to the pedestal member. The parts have permanent connection so that they remain always in assembled relationship, and this relationship of the pattern wall members is such that their complementary disposal forms a member of bar or barrel shape whose perimetrical face is adapted for the reception of a friable facing material of a sort customarily employed in known practice. On juxtaposed portions, the central pedestal member and the various pattern wall members are provided with coperating wedges or inclined planes arranged at an angle relativeto the axis of the device, which wedges coperate with links pivotally connecting the respective pattern wall members to the pedestal member, to maintain the parts in assembled relationship and in proper disposal under their own weight when the device is resting either on the extremity of the pedestal member or upon the extremities of the pattern wall members at the opposite end of the device. The angulardisposal relative to the axis of the device of the engaging wedge faces on the pattern wall members and the pedestal member is not less than the angle of friction or repose, so that Ywhen the weight of either the pedestal member or of the pattern wall members is overcome by pressure upon the latter directed toward the axis of the device, the resultant will impel the wall members and pedestal members for relative longitudinal movement, which relative longitudinal displacement of these members will permit the colplane, at which inclination the parts are just ready to slide so that the wall members will slide on the pedestal member upon the application of pressure toward the axis of the device.

At the longitudinal line of junction beare so formed that when the wall sections are at their outer or expanded position, they make'close and substantially smooth contact, leaving no externally disposed grooves or clearance spaces to which facing material might have access. To effect this result, the contacting portions of the wall members are disposed in over-lapping relationship. To provide the necessary clearance between juxtaposed wall members, so as to permit the contracting or collapsing movement thereof, the arrangement of connections between the wall members and the supporting pedestal is such that the wall members carrying the external over-lapping portions are withheld from movement until the portions which they over-lap have been moved inwardly to afford the necessary clearance.

Referring now to the drawings, in which is shown an illustrative embodiment of the invention, it will be understood that Figure l represents a rear sectional elevation such as would be taken on a line l-l of Fig. t;

Fig. 2 is aside sectional elevation such as would be taken on line 2 2 of Fig. 4L;

Fig. 3 is a perspective of front and side pattern wall portions;

Fig. 4 is a cross-section such as would be taken on line 4-4 of Figs. l and 2, and shows in addition thereto the arrangement of facing material;

Fig. 5 is a detail illustrating the relationship of contacting portions of juxtaposed wall parts in expanded position; l'

Fig. 6 is a similar detail showing the same parts in collapsing position; and

Fig. 7 is a diagram illustrating arrangement of portions of the Vdevice with respect to dimensions of the casting.

Referring to these illustrations by means of the reference numerals applied, it will be understood that the letter C designates the pedestal or supporting member, S the back wall member, B theside wall member, and U the front wall member.

The pedestal member C is formed with a base l provided with an aperture Q for the reception of the stripping hook. From the base portion rises a shaft el which may be cast in hollow form, and which carries wedges 5, stop members G, link pockets 7,

vpin seats 8, and at its upper extremity'a earrying-hook keeper' 9. The Wedges 5 are arranged in. two groups, one disposed toward the lower extremity of the shaft and the other toward the upper extremity thereof. ln each group are Wedges extended from the iront, the sides and back of the shaft'. At the link pockets the shaft is Webbed andapertured, and the pin-seats are apertured.

The back Wall member S is a casting- 'formed with inwardly directed Wedges l0, and carries the hook keeper ll at its lower extremity'and a forwardly extending supporting` member l2 at its upper extremity, whiclifsupport is reinforced by brackets 14. The support l2 is provided With laterally opening apertures l5 'for the reception of holding-'down Wedges.' `The front and side Wall members are substantially identical,

eaeh being provided With the Wedges i6 raving their active faces inclined oppositely to the incline of the Wedges on the pedestal member, and each beingF provided With counter-sunk link pockets 17. T he form and size of the side, back and front members Y are suoli that When placed together in their complementary disposal they form a core bar of proper dimensions.' ln the embodiment shown the iront and back members are provided with the lateral overlappingr extensions 1S. These lateral extensions turn oil2 Jlrom the normal planes of the members on, which they are carried at an angle of about 45o, and' on their inner surfaces are adapted to `make contact against curved facesA i9 adjacent the lateral marginsof the side members. rllhe extensions i8, however, do not reach to the line of tangency between the front iaces of the side members upon the Curved faces i9. The extensions 18 are tapered of? to a thin edge, so as to present a smooth joint, and this contour of the ex tensions lS and the faces 19 give the core bar, in the embodiment shown, rounded corners, Without any channels or open spaces along' the line oi? Contact.

The front, back and side Wall members are held in assembled position by pivoted links These links have T heads seated in the link pockets l? as illustrated in Fig. Il, the shanks of the links being,` passed through the slots in the Wall m bers so as to project inwardly and into tbe link pockets 7 of the pedestal memberL it their inner extremities the links are pivotally secured to theV pedestal member by pins 2l. The links thus pivot-ally connected to the ivall members and the pedestal member retain the former in place upon the latter anl provide means for limiting their outward inovemen These links furthermore operate to bold the cooperating Wedges on the `v-Jall members and the pedestal member in effective engagement when the device is in its normal position. ln assembling' tbe vice, the appropriate 'linka slipped through the holes them in the Wall members, member is then u 'i a;h

and these links pushed into link po kots am. the r pushed la piece.' The Ee are then set up and their links their link poe ts and the -i from the back of the device the side link pins can be :ze longitudinal movement by ters. rhese parts having been sition, the back Wall member is tben against the body member i pushed into the link porn readily done if the core br and resting` on The iront side. si then naturally i ll into their When the bark member is positie the pedestal. retainin r;` back links lcan rien be inserr Wo ends of the core bar b inserting his arm or a p j eotters for said links can be inserted wise in the retainingpins.

rllhe de thus A mbled adapted .to stand upright either in {aree-*position u the base l, or ininverted support l2. ln the first position tl, members are capable o1?? npivard 'no longitudinally of the pedestal., and last mentioned position the peflestaU i is caJable of upward ment on the Wall r embers. ylfb-en utilized in the customary fashion the i old the supported one upon the o'n is said-:lient to sustain the fierrostatie pressnre metal poured into the mold, so that, u the metal sets., the pattern viali o? the ore remains at its norn'ial position. Due the fact, however, that the inclination of the engaging faces of the Wedges on the wall and pedestal members relative to the axis o' device is never less than the angle of rep i.

for these parts, as soon as the lateral pres-11.5 sure on the Wall members is increased :il i the ferrostatic pressure of the fluid ner as occurs on the shrinking` ot the casi.' consequent upon its cooling` and set 1' such pressure Will be eiiiective to impe.

lli)

angles t0 accommodate these differential'` vmovements,those on the side-members having ygreater angularity relative to the axis of the pedestal men'ioer than those on the front and back members. l"ihis provides the necessary clearance forA the inward move-V ment of the iront andl back members and, since the curved extensions i8 do not reach to the tangent faces of the side members,

said extensions i8 may passfclear of the' sand from which the side wall members have retreated. rlhis operationV is illustrated in somewhat exaggerated scale in Figs. 5 and 6. ll/.loreover, the cnrvedcontour and angular disposal'of the extensions 18 praetically eliminate all binding effect from lateral shrinkage .ot the casting as the resultant pressure is exerted in such fashion as tends to move the wall members carrying Vsaid extensions toward the of the device, rather than to compress them transversely. Consequently, when the cross-section et the core is approximately equidimensional,l it is a matter of indifference whether4 these extensions be placed on the front and :back or on the side wall members. When, however, lthere is substantial difference between the two cross-sectional dimensions ot the core, then it is preferable to place the curved extensions 18 onthe wall members which extend in the shorter dimension oit the casting7 and shape the other wall members as shownior the side members inthe embodiment illustrated. The reason for this is that it the core bar is lei't in the casting until vthe latter cools completely there will be the most shrinkage in the direction of the greater dimension, and since there is less clearance from the sand at the margin of the curved extensions TLSV than at other surface points ot' the device, these margins should be disposed on the line of the least shrinkage, as illustrated in Fig. 7, wherein the casting is designated by the character L. Thus a cross-section oit' 4 feet by 2 feet would lhave a shrinkage from fluid iron to cold casting of about l- 'inch one way by 71;' inch the other. llt the curved extensions had, by design, a clearance of inch,`it is obvious that if placed in the long dimension, they would not clear, while it placed in the 'short dimension they would Y clear freely'alllaround. As specifiedabove,

it is important that the wall members withp weight out the cnrvedextensions be supported von the shorter links so that they may move slightlyl lahead oi those Vhaving the lesser clearance from thesand. y

.ln o; eration, when the eorebar is used in ere position, standing onthe base l, with the wall members resting on their -respectivewedgetaces, and the outer limits determined by the links,the core bar will form a rigid structure. And, no matter fupon which end it Vis thus positioned, the

device under the weight and operation ot its parts normally and automatically assumes its proper form and position. rlhe automatic movement of relatively movable parts to proper position is always insured, due to Vthe guiding and limiting inlluence the wedges and the links, and due. also to the fact that lateral movement ot the wall members is positively prevented by the fit ott the links inthe link slots, and the broad bearing faces ot the link pockets. When the casting is strippedirom the core, the wall members rise with the casting, due to the coherence-or" the sand, and the weight ot the pedestal acting through the links, will tend to pull the wall members'bodily away from the sand. lllhen the wall members are thus freed they tall back to their expanded position on the pedestal. lt the core is made with the large end up, the bar being supported on the bracketed support l2, the oi: the pedestal member, supported on the wedge tacos oi the wall members, will keep the core bar expanded. rlhe stripping is accomplished by hoisting the pedestal, thereby removing the support ot the wall members, which then move bodily away from the sand and are easily pulled out of Vt ie castingby the 'continuedlift on the pedestal. 'llo carry the core bar expanded with the small end' up requires the carrying hook to be, attached to the pedestal member, for which reason the keeper 9. is provided. To carry with thelarge end up requires that the bar be litted by the 'wall members, which vis accomplished by engagv ing the carrying hook in the hook keeper ll on the back member S; ln stripping in the inverted process the' hook is engaged with the base member lby insertion through the aperture 2. The relative longitudinal movement et' the pedestal and wall members in this operation is limited by the engagement of the stops 6 with the ends et the wedges l0 Voi the back wall member S. There is no liability of straining the connection of the links at any time, as they are under tensional stress only, and only to an extent suliicient to hold the wall members from falling apart. Consequently they keep their position in the slots provided for them and do not disturb the sand about the wall members, as there is no movement ot the links exceptvwhen stripping, either automatically or mechanically. During the stripping, no

binding pressure is imparted to the mountingsl of the linli's7 asthe wall members are free to move Ainwardly on them'7 it such change oi position is necessary.

Havingl thus described my invention, what l claimis:

l. A collapsible core bar kcomprising a pedestal member, pattern wall members separately connected thereto and movable toward and' from the same, a base carried by the' pedestal mem-ber at one end oi the rilevi-ce', a support carried by a wall member :it the other end oi the device, said base and said stu' A)ort each providing a rest upon which the device may stand"j and coperating members carried by the pedestal and wafll members eil'ective to maintain the latter normally at their outer position when the de 7ice is standing.

2. A collapsible core bar comprising a pedestal member, pattern wall members separately connected thereto and movable toward and 'from the same, a' base carried by the pedestal member at one end oi the' device,V ai support carried by a walfl member at the other end of the device7` said base and said support each providing a rest upon which the device may stand9 cooperating members carried by the pedestal and wall members ei'l'lectiveV to maintain the latter normally at their outer position when the device is stai'iding` and an attaching member on the pedestal member whereby it may engaged to eii'ect relative movement oi the wall and pedestal members.

A collapsible coi bar comprising a pedestal member7 pattern wall members separately ronnected thereto and movable toward and from the same, a base carried by the pedestal' member at one end oi the device7` a support carried by a wall member at the other en'd of the device', said base and a l support eachproviding a rest upon win-ch the device may stand, and coperatmembers carried by the pedestal and wall members effective to maintain the latter normally at their outer position when the device is standing; the pedestal member being provided with an engaging portion .vhereby the device may be engaged to be li ited.

A collapsible core bar comprising pedestal member, pattern wall members separately connected thereto and movable toward and from the same, a baserarried by the pedestal member at one end oi the device, a support carried by a wall member at the other end of the device, said base and said support each providing` a rest upon which the device may stand, and coperatinsj members carried by the pedestal and Wall members effective to maintain the 'latter normally at their outer position when the device isstanding; Vwall and pedestal members being provided with attaching io'rtion's whereby they may be engaged 'to eiiect their relative movement, and said Wall wvl pedestal members being provided also wi i engaging portions whereby they may be engaged to permit lifting@r of the device with the parts in normal position.

5, A collapsible core bar comprising a: pedestal member, pattern wall members separately connected thereto and movable toward and' from the same, means preventing lateral displacement of the wall members on the pedestal member, a base carried by the pedestal member at one end oi the device, a support carried by a wall member at the other end of the device', said base and said support each providing a rest upon which the device may stand, and coperati'ng members carried by the pedestal and wall members eiiective to maintain the latter normally at their outer position when the device is standing; wall and pedestal members being provided with attaching portions `whe'reloythey may be engaged to effect their relative movement, and said wall and pedestal members being provided also with ei'igaging portions whereby they may be engaged to permit lifting of the device with the parts in normal position.

6. A collapsible core bar comprising a pedestal member, pattern wall members separately connected thereto for movement longitudinally and to and from the same, the extremity oi" the pedestal member at oneend of the device providing a: base upon which the device may stand, the extremities of the wallv members at the opposite end of the device providing av base upon which the device may stand, members on the pedestal and wall members cooperating when the device is in standing position to maintain the wall members normally at their maximum distance from the pedestal member, and attaching members on wall and pedestal members whereby they may be engaged to be moved.

7. A collapsible core bar comprising a pedestal member, pattern wall members separately connected thereto for movement longitudina ly and to and from the same, the extremity of the pedestal member at one end ci the device providing a base upon which Vthe device may stand in upright position. the extremities oi the wall members at the opposite end ot the device providing a base upon which the device maystand in inverted position, members on the pedestal and wall members cooperating when the device is in standing position to maintain the wall members normally at their maximum distance from the pedestal member` and members limiting the extent oi relative movement ot the wall and pedestal mem` bers.

8. A collapsible core bar comprising a pedestal member, pattern wall members separately connected thereto for movement longitudinally and to .and from the same, the extremity of the pedestal member at one end of the device providing a base upon "which the device may stand in upright position, the extremities of the Wall members longitudinally and to and from the same,V

the extremityy of the pedestal member at one end of the device providing a base upon which the device may stand, the extremities of the Wall members at the opposite end of the device providing a base upon which the Vdevice may stand, members on the pedestal Yand Wall members cooperating When the device is in standing` position to maintain the Wall members normally at their maximum distance from the pedestal member under theY influence of gravity. Y

10. A, collapsible core bar comprising a pedestal Y member, p atterri wall Y `members severally connected thereto and movable longitudinally and to and from the pedestal member, said ymembers including portions for maintaining the device in standing position, and cooperating portions on the pedos-- tal member' and the wallrmembers having contacting inclined faces, the angle of said inclined faces relative tothe longitudinal axis ofthe device including the angle ofV repose of the relatively movable members.

llfA collapsible corerbar comprising a pedestal member, pattern Wall members severally connected thereto and movable longitudinally and to and from the pedestal Vmeinber,.said members including portions for maintaining the device in standing position, and cooperating portions on the pedestal memberand the Vwall members.having contacting` inclined faces, and effective under the influence of grai-'ity Vto maintain the 'wall members'iiormally at their outermost position relativeto the -pedestal member. when the device, is standii'ig, the angle of saidV inclined faces relative to the longitudinal axis Vof the device including the angle Yso of repose of the. relatively movable members.

12. 15-`..collapsible core bar comprising a pedestal member, pattern wallY members severally connected thereto and movable longitudinally and to and from the pedestal 'member, said members including portions for maintaining the device standing on end,- and ,cooperating guiding portions on the` Vthe connections pedestal member andthe Wall members havi gle of repose of the relatively movable L embers, and the angle ofinclination of guiding portions associated with certain Wall members being greater than the angle of inclination of the guiding portions associated with other Wall members.

.13. A collapsiblev core bar comprising a pedestal member, pattern Wall members associated therewith and movable longitudinally andV to and fromV the pedestal member, said members including portions for maintaining` the device in standing position, pivoted links connecting the Wall and pedestal members, and coperating portions on the pedestal member and the Wall members having contacting inclined faces, the angle of said inclined faces relative to the longitudinal axis of the device including the angle of repose of the relatively movable members; the links connecting certain Wall members to the pedestal member being longer than the linksV connecting other Wall-members to the pedestal member.

14. In a collapsible core bar, the com ination of a pedestal member, pattern Wall members freely supported on the pedestal and movable longitudinally relative thereto f by pressures directed inwardly against the outer faces of the Wall members, guide members, and operative connections joining the Wall membersseverally to the pedestal. member; vsaid operative .connections being arranged to permit movement of the Wall members to and from the pedestal member during their relative longitudinal movement, and the guide members being arranged to permit different Wall members to approach the pedestal `member at different speeds. *Y Y. Y

15. In a collapsible core bar, the combination of a pedestal member, pattern ivall members freely connected to the pedestal memberimd movably longitudinally relative thereto and to one `another by pressures directed inwardly against the outer faces of the ival'l members, and operative connections joining the wall members to the pedestal member; said operatve connections being disposed to guide the vrall members to and from the pedestal member duringqtlieir relative longitudinal movement, associated with different Wall vmembers permitting different Wall members to approach the pedestalrmember at different speeds. v d Y Y, lo. ln a collapsible core bar,'the combination of a" pedestal member, .pattern Wall members freely connected-to the pedestal member and vmovable longitudinally relative Vtojone another and the pedestal member by o@ t he iva pressures directed inwardly against'the outer faces 'of the Wall members, and operative connections joining' the Wall members to the pedestal member and dispesed to guide Wall members to and from the pedestal member daring` their rclatiif'e longi- :noi'i st, the conn rions associa ,i f 'permitting their movement toward the pedestal member d oi other wall members.

l' a collapsible core bar, the combi- 'i n'iembers.

souateL .if'ith certain Wall members saving a degree ot angularity than others ,tor n mittuiov a more direct aooroach to the i 4 n l i 1 p tal member by some Wah members than ly others.

lf), la collapsible'core bar the combination ot relatively movable pattern Wall meml posed in complementary arrangement aoout an axisq spacing; means for ing; the distance ot' said wall members y axis, juxtaposed wall members ,ntactine` over-lapping' marginal po c1-ons, the ma t 'ns of the exterior' overlapping portions tapering' down to the su:- 'aces which they contact and terminating' short of the phmes of the outermost faces 1l members juxtaposed thereto,

Y collapsible oar tie combination o elfitire movable pattern Wall members dispose-il in complementari'y arrangement al'zeut an axis, sj'iacinn' means ier varyine' the distance ot said Wall members 'from such axisA juxtaposed Wall mei'nbei's having' curved contr ctinjr over-lapping marginal portions1 the margins ot the exterior' overlapping' portions terminating' short or" the n A the tangent' ta ces ot the members ternal over-lapp ngz marginal les for controlling the 2l. ln a collapsible core bar the combination et relative i1i wal lc pattern Wall members disposed in complementary arrangent C.bout an is, spacing; means tor var n- Y' the perpenoicnlr-.r distances ot said wall members from sach axis, ju "'aposeil wall lr embers having; contact over-lapping marginal portions, the margins el the Wall members bearing` the exterior over-lapping portions tapering' down to the outer Jaces oit' the Wall members juxtaposed thereto.

22. ln a collapsible core bar the combination et relative movable pattern Wall members disposed in quadrilateral arrangement about an axis, spacing' means for varying the distance o'f said Wall members from such axis, juxtaposed Wall members having contactinp` over-lajpingj marginal por-tions, the margins ot the exterior mier-lapping por tions terminating; short of the planes ot the outermost faces of the Wall members juxtaposed thereto.

ln a collapsible core bar the combination oi" relatively movable pattern Wall members vdisposed in quadrilateral arrangement about an axis, spacing' means tor varying` the perpendicular distance of said Wall members from such axis, jutaposec. wall members having contacting; over-lapping' marginal portions, the margins ot the exterior over-lapping portions terminating: short oi' the planes or" the outermost faces ot the Wall memlfers juxtaposed. thereto.

ln a collapsible core bar, the combination ot relatively movable pattern wall members'disposed in quadrilateral arrangement about an axis, spacing' means tor if'aryins' the perpendicular distance of said wall members from such axis, juxtaposed Wall members haring' contacting' over-lapping marginal portions termine' curved corner pa*- terns, the margins of the exterior over-lapping' portions terminating' short of the planes of the outermost faces of the Wall members juxtaposed thereto.

525. ln collapsible core bar, the combinatio'n'oi' a pluialitjT ot relativeljT movable pattern Wall members d josed in coniple` mentary arrangement, spacing' means open able to vary the perpendicula; distance ot Wall members from each other, jux'aposed Wall members harina' contacting overlapping marginal portions, the distance between the external overapping margins ot a Wall member beine less than the parallel distance between the adjacent outer surfaces of wall members juxtaposed thereto 26. ln colla'sible core bar. the combination ot a pluralit?7 ot' relatively movable pattern Wall members disposed in quadrilateral arrangement, sjiacing; means operable to verf! the distance oi opposite Wall members :from each other.v certain Wall members having; marginal extensions over-lappingy the .iargins ot' the juxtaposed Wall members complementary the width of the wall members having said marginal extension being less than the distance between the Vouter surfaces of wall members perpendicular thereto.

27. ln a collapsible core bar, the'combination of Va plurality oi' relatively movable pattern wall members .disposed in quadrilateral arrangement, spacing means operable to vary the distance of opposite wall members from each other, juxtaposed wall members-having curved contacting over-lapping marginal portions, forming rounded corners on the pattern wall, the margins of the members having vthe external over-lapping portions being within the span oi' the outer surfaces of wall members disposed perpendicular thereto.

28. In a collapsible core bar, the combination Vor' a pedestal member, relatively movablek pattern wall members arranged in relationship around the pedestal member, and hinged connections joining the-pedestal andthewall members,

' the wall members being movable upon said lhinged connections toward the pedestal member.

29. In a collapsible core bar, the combination or' a pedestal member, relatively movable pattern wall members arranged in complementary relationship around the pedestal member, and rigid links pivoted on the pedestal member and cooperating with the wall members to limit outward and lateralV movement thereof, the wall members being movable longitudinally on said links.

30. In a collapsible core bar, the Vcombination of a pedestal member, relatively movable pattern wall members freely supported upon the pedestal member, and operable by inwardly directed pressure upon the wall members to permit movement of the wall members obliquely toward the pedestal member. v 31. In a collapsible core bar, the combination of a pedestal member, pattern wall members arranged in complementary relationship around the pedestal member and having relativev longitudinal movement, operative guiding connections between the pedestal and the wall members operable by inward pressure upon the latter to effect movement of the wall membersV obliquely toward the pedestal member, and members on wall and pedestal members whereby they may be engaged to eilect their relative movement.

32. In a mold device, a collapsible'coreV Vbar comprising the combination of a plurality of relatively movable pattern wall members disposed in quadrilateral arrangement about an axis, spacing means operable Yto varyV the perpendicular distance of wall members from the axis, the wall members disposed in the shorter cross-sectional dimension of the mold having marginal -eX- tensions forming corner patterns Vcontacting with and over-lapping marginal portions of juxtaposed wall members, and members retaining the wall'members against lateral movement.

33. ln a collapsibleV core bar, the combination of a pedestal member, relatively movable pattern wall members of different widths arranged in complementary relationship around the pedestal member and movable to and from the same, guiding members associated with the pedestal and the wall members having angular relationship to control their speoial relationship, the guiding members permitting movement of the wider wall members ahead of the narrower wall members and means connecting the wall .members to the pedestal Vmember effective to prevent lateral displacement of the former on the latter.

34. lnv a collapsible core bar, the combination or' a pedestal member, longitudinally movable ypattern wall members aranged in polyhedrical relationship around the pedestal member and movable independently to and from the same, guiding members associated with the pedestal and the wall members for guiding the latter toward and from the former independently of one another, and members associated with the wall and pedestal members eiective to prevent lateral displacement of the former upon the latter.

35. ,In a collapsible core bar, the combination of a pedestal member relatively movable pattern wall members supported thereon for movement longitudinally and to and from the pedestal member, guiding members associated with the pedestal and wall members Yfor controlling vthe movement of the latter toward and from the former, link pockets provided on the pedestal member, links pivotally seated in said pockets and connected to the wall members to permit inward movement of the latter upon the links andk limit the outward movement of said wall members and means'coperating with the links to retain them against lateral movement.

36. In a collapsible core bar, the combination of a Ypedestal member, relatively movable pattern wall members supported thereon for movement longitudinally and to and from the pedestal member, guiding members associatedwith the pedestal and wall members for controlling the movement of the latter toward and from the former, link pockets provided on the pedestal member, links pivotallyseated in said pockets and pivotally connected to the wall members, and means between the pivotal connections of the links for limiting their Vlateral movement.

37. In a collapsible core bar, the combination of aV pedestal member, pattern wall members supported thereon in polyhedrical arrangement Jror movement longitudinally and to and from the pedestal member, guiding members associated With the pedestal and Wall members for controlling the movement of the latter toward and from the former, and marginal extensions on certain of the Wall members extending angularly from the normal planes thereof and over-lapping and contacting with the marginal portions of the wall members juxtaposed at each side thereof, said extensions being disposed on the Wall members which extend in the lesser cross-sectional dimension of the mold.

38. In a mold, a collapsible core bar comiprising the combination of pattern Wall members supported in polylateral arrangement about an axis for movement longitudinally and to and from the axis, spacing means associated with the Wall members for controlling their movement toward and from the axis and marginal extensions extending angularly from the Wall members disposed in the lesser cross-sectional dimension of the mold and over-lapping the uXtaposed Wall members; said spacing means enabling inward movement of such juxtaposed Wall members in advance of such movement of the Wall members carrying the marginal extensions.

39. In a collapsible core bar, the combination of a spacing member, pattern Wall members movable toward and from the axis oi? the spacing member arranged around the spacing member7 based portions disposed at opposite ends or' the device upon which it may stand upright, and operative guiding connections between the spacing and the Wall members whereby the latter are maintained normally in complementary relationship by gravity when the device is standing on either end.

40. In a collapsible core bar7 the combination of a pedestal member, relatively movable pattern Wall members arranged in complementary relationship around the pedestal member and movable to and from the same, associated means on the pedestal and Wall members for maintaining the latter at a maximum distance from' the former by gravity when the device is standing upright, a pedestal portion extending beyond the Wall portions at one extremity of the device to aiord a base upon which the device may stand, and a Wall member portion extending beyond the pedestal member at the other extremity of the device to provide a base upon which the device Will stand upright.

RAY G. COATES.

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