US1442104A - Collapsible arbor - Google Patents

Description

Jan, 16, 1923.

1. T. STONEY.

COLLAPSIBLE ARBOR.

2 SHEETSSHEET I FILED MAR. 29, 1920.

Liz/6 776 Sam. 16, 1923. 1,442,104.

1. T. STONEY.

COLLAPSIBLE ARBOR.

FILED MAR. 29, 1920. Z'SHEETS SHEET 2.

lnverz o1,

Patented Jan. 16, 1923.

UNITED STATES groan '1. STONEY, or GLEVELANDQIOHIO.

coLnArsIBnn ARBOR.

Application filed-March 29, 1920. Serial No. 369,560.

To all whom it may concern:

Be it known that I, JOHN T. STONE-Y, a citizen of the United States, residing at Cleveland, in the county of Cuyahoga and State of Ohio, have invented a certain new and useful Improvement in Collapsible Arbors, of which. the following is a full, clear, and exact description. v

The present invention relates to the making of green sand cores for molding purposes and is more particularly directed toward a collapsible arborfor use in connection with the making of such green sand cores.

The resent form of collapsible arbor is particu arly useful in making the under, or supporting green sand core, in carrying out the method of molding set, forthin my copending application Serial No. 281,9s5, filed March 11th, 1919. However, I do'not wish to be understood as in any waylimiting the applicability of the present invention, as the collapsible arbor may be used in making green sand'cores for use other than in carrying out-the particular molding method re ferred to. 6

Large cores for molding purposes are usually made of baked sand because in the baking a certain amount of inherent strength is imparted to the core which enables it to support its own weight when the core is placed in'a mold. A green sand core usually does not of itself, have suificient inherent strength to permit of its being supportedv at'its ends when placed within a mold and where a large coreis made of green sand it isnecessary to provide an interior or strengthening structure which imparts inherent strength to the finished green sand core..

. It is a prime requisite of such a core support that it be removable from the inside of the casting when made, for reasons which are obvious and in the present form of arbor which'is shown the arboris collapsible in a fashionwhich permits the removal of the arbor from within the casting without breaking the arbor. Reference should be had to the accompanying drawings forming apart of this specification in which Fig. 1 is a top plan view of a'core box having a collapsible arbor of the resent invention mounted within the same; i 2 is a side elevation of portions in section 0 the arbor; Fig. 3 is a section along ,A proper number of plates is provided so as to I strength to the body of green sand when extend through the opening close and intimate contact between the plates 'thel-ine as of Fig. 1; Fig. 4 is a section along the line 4l1 ofFig- 1; Fig. 5 is a top plan view of the modified formpf arbor and core box; Fig. 6 is a transverse section showing the arborin a core box with sand; Fig. 7 is an end elevation with por-. tions in section of the core box with arbor shown in- Fig. 5 Fig. 8 is an elevation of the opposite end member'for the core box, to that shown in Fig. 7. a Y

Referringto the drawings, 1 indicates the wall. of a core box which will of course be of proper configuration to mold; a core of the required size andv shape. Within the core box and extending from end to end thereof is abar 2. This bar from approximately the middle thereof-toward one end is providedwith side ledges 3 and 4 and the surface of the baronthe underside between the ledges is substantially semi-circular in form, the upper part of the bar is in the instance shown flat. The portion of the bar whichis provided with the ledges 3 and lis ta- 'p'ering, that is to saythe ledges 3v and 4: d1-

verge toward the end of the bar and likewise the side walls of these ledges or. shoulders also diverge.

Cooperating with the ledges 3 and 1 are plates which are indicated'at 6. One of these plates is shown in Fig. '4: and as shown is provlded wlth a groove wlnch coni'orms to the shoulders or ledges 3 and 4 and the semicircular bottom part of the bar. "The plate ,ously described they will assume positions upon the bar at diflferent places between the endsthereof. This is illustrated in. Fig. 1.

give sufficient stiffening 'efiect and packed around the plates 6.

The plates are provided with holes or openings such as indicated at 7 in F1g..2 so

.that when the green sand ispackedaround the plates, portionsqof the reen sand will and so form a and the sand;

The forward portion of the bar 2 is also provided with shoulders 8 and 9 which are similar to the shoulders 3 and d and these shoulders are adapted to receive and support which may beused and it is entirely within the scope of thepresent invention to provide the shoulders 3 andd throughout the entire extent of the bar 2 and to have the side walls of these shoulders arranged in the tapering fashion before explained.

At the end of the bar 2 there is a plate 11. This is shown in elevation in Fig. 3. it is quite the same in many respects as the plates 6 and is secured on the bar 2 in precisely the same fashion but the plate adjacent its lower partis provided with aledge 1.1 which receives a bolt 12 having the head thereof on one side or". the ledge and the lower portion of the bolt is adapted to ex tend through the floor 3 of the core box and when the bolt is so inserted the lower end of the bolt receives a nut 13 which securely fastens the end plate 11 tothecore box and. so holds the arborand the plates 6 carried thereby against movement within the core box. The arbor 2 at its opposite end has a plate 14 which is slidably mounted on the end of the arbor and is Pi'O'VldGtl with a bolt 15 having a nut 16 by which the plate is secured in the core box in precisely the same manner as described with respect to the bolt 12. Thus both ends of the arbor are anchored within the'corebox and are rigidly held against movement not only during the time whenthe sand is packed in the core box but also is held against movement with respect to the core box when the core box is inverted for the purpose of withdrawing the core box from the core. Obviously the nuts 13 and 16 are removed when. the core box is withdrawn.

In using the arbor which has been described the plates 6 are arranged along the arbor as indicated in the drawing and the end plates are secured within the core box, the greensand is then thrown in the box and compacted by methods which are well known." With the green sand suitably compacted the core box may be removed and the core positioned; in the mold in a well known manner. Obviously the arbor being anchored in the core box permits the core box to be handled without dangerof damaging the core.

After casting .has been made the arbor may be disassembled by driving the bar 2 in. a direction which 'will'loosen the plates 6. This then permits the withdrawal of the bar 2 through an end opening in thecasting andv In Figs. 5 to 8 I have illustrated a different form of collapsible arbor which may be used in connection with a different type of core box, however. the same principle of construction may be utilized, as before described. In Figs. to 8 of the drawings re= ferred to there is shown a core box 10.

In Fig. 7 there is shown a core box 10. This core box at its ends is provided with substantially semicircular openings, oneof which is indicated at 111. and at will be understood that at the opposite endv there 15 also a semi-circular openingof the sameor different size to that shown in Fig. 7.

Cooperating with the openings in the ends of the core box are plates 12 and 13 these plates being secured in their proper;openings each by means of a bolt which occupies a slot in the lower part of the end member with which it is associated; and: ex tends through an opening formed in thebottom of the core box. The-bolt is slotted to receive a wedge 1%, which when driven home, forms an efficient securing means. i

The endmembers 1 2 and 13 are provided with openings adjacent theirupper parts which are adapted to receive the main member of an arbor. r

In the drawings, this main member of the arbor is indicated at 15, and is made trian gular in shape, as indicated in Fig. 7, as are likewise the openings in the end plates for the core box. as indicated at 12* in F ig; 7.

The member 15 tapers from one end to the other for a purpose which will be presently described. Y

Upon the member 15 there are mounted a number of plates such as indicated at '17. 'One of these plates is shown in elevation in Fig. 8, and as will be seen, each plateis provided with an opening suchasindicated at 17 which is of triangular shapein order to permit the member 15 to. pass'through the opening. Furthermore, each of the plates l'l is provided with a plurality of openings such as indicated at 18*; 'r

The various plates 17 are positioned upon the member i=5, and-inorder to hold these plates securely in tl'ieir adjusted position,

'thesize of the opening 17 in the various plates varies in accordance withtheposition which it is to occupy upon themember 15 the plates having the smaller size-opening 17* are placed to their; proper-position, the

box is filled with reen sand to make the core, and in the making of this core the usual methods may be employed; that is to say, it maybe jar rammed or hand rammed as may be desirable. The sand when compacted within the core box extends through the openings 18 which are formed in the plates 17, thus exerting a tying or binding action to prevent the displacement of the sand with respect to the plates 17. The plates l'l 'are preferably tapered, as indicated in Fig. 6, for the purpose of exerting a wedging ac tion which will assist in holding the sand when the core box is inverted.

The arbor which comprises the member 15 with the plates 17*, is a collapsible arbor, that is to say, that when a completed mold has been made, in connection with which the core, such as shown in Fig. 6 has been utilized, the collapsible arbor, may be dis-assembled by driving the member 15" from the plates 17*, thus dis-assembling the arbor and permitting the individual parts thereof to be withdrawn from the interior of the cavity "of the casting.

Having described my invention, I claim:

1. A collapsible arbor comprising a rod which tapers from one end to the other, said rod being provided with a flat side,a plurality of plates, each of said plates being provided with an opening adapted to receive said rod, the openings in said plates being of different sizes, whereby the plates are positioned upon the rod when the rod is introduced to the openings in the plates, each of the openings in the plates being provided with a flat side which communicates with the flat side of the rod, thereby preventing rotation between the rod and the plates.

2. A collapsible core comprising a rod which tapers from one end to the other, a plurality of plates, each plate being provided with an opening adapted to receive the said rod, the openings in said plates being of different sizes whereby the plates are positioned upon the rod when the rod and plates are assembled.

3. A collapsible core comprising a rod which at intervals throughout its length has portions of different cross-sectional area, a plurality of plates, each of which is provided with an opening to fit one of the aforesaid portions of the rod whereby the plates are spaced and positioned upon the rod.

4. A collapsible core comprising a rod having atapered portion, said tapered portion being provided with ledges,'a plurality of plates, each plate having an opening which co-operates with the ledges of the tapered portion, the said openings in the plates varying in size whereby the plates are positioned upon the tapered portion of the rod at diflerent parts thereof.

5. A collapsible core comprising a rod, a plurality of plates. adapted to be positioned.

at difierent points upon the rod, an end plate adjacent each end of the rod and means associated with each end plate for securing the same to a core box.

6. A collapsible core comprising a rod, a plurality of plates, each of said plates having an opening adapted to receive the said rod, end plates also having openings to receive the rod and means associated with each end plate for securing the same to a core box.

my signature.

JOHN T. STONEY.

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