US2791012A

US2791012A - Core box top handling mechanism

Info

Publication number: US2791012A
Application number: US341647A
Authority: US
Inventors: Leon F Miller
Original assignee: Osborn Manufacturing Corp
Current assignee: Osborn Manufacturing Corp
Priority date: 1953-03-11
Filing date: 1953-03-11
Publication date: 1957-05-07
Anticipated expiration: 1974-05-07

Description

y 1957 L. F. MILLER 2,791,012

CORE BOX TOP HANDLING MECHANISM Filed March 11, 1953 5 Sheets-Sheet 1 m r m m in f m w m no m V: In a N 4, N A I v INVENTOR.

' LEO/V F. M/LLE/Z T-ronus Y6.

y 7, 1957 L. F. MILLER 2,791,012

CORE BOX TOP HANDLING MECHANISM Filed March 11, 1953 5 Sheets-Sheet 2 INVENTOR. Lid/V N/LLER xwcz QTTOQNEK? L. F. MILLER CORE BOX TOP HANDLING MECHANISM May 7, 1957 5 Sheets-Sheet 3 Filed March 11, 1953 INVENTOR. LEON F. M/LLEE y 7, 1957 II. F. MILLER 2,791,012

CORE BOX TQP HANDLING MECHANISM Filed March 1]., 1953 5 Sheets-Sheet 4 ATTORNEYS May 7, 1957 F. MILLER 2 CORE BOX TOP HANDLING MECHANISM Filed March 11,- 1953 5 Sheets-Sheet 5 I C INVENTOR. .?;9./6 LEON F. MILLER ATTOPA/Eks CORE BOX TOP HANDLING MECHANISM Leon F. Miller, Fairview Park, Ohio, assiguor to The Osborn Manufacturing Company, Cleveiand, Ohio, a corporation of Ohio Application March 11, 1953, Serial No. 341,647

Claims. (CI. 2210) This invention relates as indicated to core box top handling mechanism, 'and more particularly to mechanism adapted to be employed with a core blowing machine in order to adapt such machine to the production of a variety of difierent cores in a continuous production run and without other adjustment of the machine.

The mechanism of this invention is especially adapted for employment in conjunction with a core blowing machine of the type disclosed and claimed in my co-pending application Serial No. 272,969, filed February 23, 1952, and the present drawing shows such mechanism mounted on such machine. In the machine disclosed in my copending application Serial No. 272,969, a plurality of core boxes are adapted to be supported by a turntable and thereby sequentially index-ed into core blowing position. Other operations are performed at other stations, including a rock-over and draw station, permitting the production of finished cores at a rate never before attained or even contemplated. Such machine has accordingly met with extraordinary commercial success in the larger foundries having large production runs of a single type a s. ate

of mold or core, and such molds and cores have been obviously be more convenient and considerably less costly if two or more of such core boxes could be constructed to produce different types and sizes of cores as required during a single run of the machine. Again, this is-per- .fectly-possible if the core boxes are of substantially the identical for both cores. More generally, however, the core boxes will require to be of substantially different dimensions and a quite different arrangement of the blow holes will also be necessary. Likewise, some core :same size, and the arrangement of the-blow holes may be boxes require to be split horizontally to provide top and I bottom portions, depending upon the shape of the core to be blown, in order to permit subsequent drawing thereof.

It .is accordingly a primary object of my invention to provide core box top handling mechanism adapted to increase the versatility of a core blowing machine of the type disclosed in my aforesaid co-pending application and to permit the blowing of a number of different cores in a single production run.

Another object is to provide such mechanism which will be automatic in operation and will both position the individual core box top beneath the blow plate at the blow station and will at other stations hold such core box top clear of the core box proper.

; A further object is to provide such mechanism which will not interfere with the rapid operation of the machine asawhole. r

Other objects of the invention will appear as the description proceeds.

To the accomplishment of the foregoing and related 2,7911 ,012 Patented May. 7, 1%57 ice ends, said invention then comprises the features hereinafter fully described and particularly pointed out in the claims, the following description and the annexed draw ing setting forth in detail certain illustrative embodiments of the invention, these being indicative, however, of but a few of the various ways in which the principle of the invention may be employed.

In said annexed drawing:

Fig. 1 is a top plan view of my new core blowing and molding machine, somewhat diagrammatic in nature, and

about which such turntable rotates taken on the line 4-4 on Fig. 2;

I Fig. 5 is a vertical transverse section through the con trol valve means mounted on such column taken on the line 55 on Fig. 4;

Fig. 6 is an enlarged fragmentary vertical section taken on the line 6-6 on Fig. 4;

Fig. 7 is an enlarged fragmentary section taken on the line 7-7 on Fig. 4; 1

Fig. 8 is a top plan view of a conventional blow plat for the core blowing unit of my machine showing the ,usual blow hole arrangement.

Figs. 9-11 inclusive are vertical transverse sections longitudinally of the sand reservoir of such core blowing innit showing different types and sizes of core boxes associated therewith;

Figs. 12 and 13 are similar vertical sections transversely of the narrow dimension of such said reservoir and associated core boxes;

Fig. 14'is an elevational view of another embodiment of my invention;

Fig. 15 is a horizontal cross-section taken on the line 15-15 of Fig. 14; and I Fig. 16 is a developed elevational view of the cam track shown in Figs. 14 and 15..

For a detailed description of the machine with which my new core box top handling mechanism is shown combined, reference should be had -to my aforesaid co-pending application Serial No. 272,969, and only a brief description of the same will accordingly be given below. As best shown in Figs. 1, 2 and 3 of the drawing, this machine comprises a core blowing unit indicated generally at 1, a turntable 2, a rock-over unit 3, and a draw table 4. Such core blowing unit is of generally conventional construc ,tion and is adapted to utilize compressed air in conventional manner to blow or drive prepared sand or equivalent molding medium into the usual core boxes 5. The turntable 2 is adapted to transport five such core boxes through a cycle including five different stations or dwells,

.two of such stations being located at such core blower 1 and rock-over device 3 respectively. Such rock-over device not only takes the filled core boxes from the turntable and inverts them for performance of the drawing operation but then also returns the empty boxes to the turntable for further indexing into position for performtance of another blowing operation. An electrical control system may be provided for the complete machine including an electric timer for sequential operation of the .several powered units.

The core blowing unit generally indicated at 1 in Fig. 1 may be of general conventional construction including a heavy base frame 6 and an upper frame or head 7. Such head is supported on base 6 by three

vertical strain rods

8, 9 and 10. Rods 8 and 9 are spaced apart to allow a slide carriage to be reciprocated therebetween through action of a double-acting piston-cylinder assembly 11, thereby reciprocating sand reservoir 12 from a position beneath hopper 13 to a position beneath blow head 14 as shown in Fig. 2. Mounted in the base 6 of the core blowing unit is a conventional clamp piston vertically'reciprocable in cylinder 15 and carrying a clamp table 16 adapted to engage and raise a core box into blowing relationship with blow plate 17 on the underside of reservoir 12. Such reservoir will preferably be provided with exhaust valves such as 18 of the type disclosed in Patent No. 2,545,944 to R. W. Ellrns. The core blowing unit itself may be of the general type described in such patent.

In the embodiment illustrated, the turntable 2 is journalled for rotation about strain rod 10 on suitable 'bearlugs and is supported by a plurality of rollers (not shown) mounted therebeneath. This turntable may be indexed in either a clockwise or "counterclockwise direction as desired, preferably by means of mechanism of the type disclosed in the co-pending application of Robert W. Ellms Serial No. 273,093 fi'led February 23, 1952 now Patent No. 2,748,625, filed June 5, 1956. For purposes of this description, however, it may be assumed hereafter, unless otherwise stated, that counterclockwise rotation is intended.

The apparatus here described is adapted to handle either mold flasks or core boxes but in the present description will be considered as conveyingcore boxes through the cycle of operation. The core boxes 5 are each mounted on individual platens 19 and are not separated therefrom during operation of the machine. Such platens are, however, not permanently fixed to the turntable 2 but are provided with trunnions 20 adapted to rest in upwardly open trunnion bearings 21 at the outer ends of arms 22 mounted on turntable 2. Such trunnions are located adjacent the outer corners of such platens as thus mounted on the supporting arms and the inner corners of the platens rest upon the respective arms themselves to support the platens and core boxes in horizontal position. In the embodimentillustrated, there are five pair of such arms '22 adapted thus to support five platens (for purposes of clarity, only the arms at one station are shown in Figs. 2 and '3). The indexing mechanism 'above referred to is adapted, during the dwell in its cycle, to leave such platens and core boxes in the positions indicated in Fig. 1 which may be considered as, comprising five stations, station A being located at the core blowing unit, station B being intermediate such core blowing unit and th'e subsequent rock-over and draw unit, and stations D and B being subsequent to such latter -station and preceding "stationA.

The platens may readily be lifted from their supporting arms at each of such stations as desired and returned thereto, as by elevation of clamp table 16 at station Aand by other mechanism at the otherstations.

The rock-over and dr'awmechan'ism generally indicated at 3 and 4h; Figs. land 3, is especially designed to core boxes or flasks from the turntable, draw the same and return them 'to'the turntable for further indexing. The

rock-over device 3 com'prisesa pair 'of spaced "

standards

23 and 24 with a shaft 25 extending therebetween and journalled for rotation in their upper ends. Keyed to the central'portion of such shaft is a strong rigid depending arm 26 terminating in clamping mechanism 27 adapted to grip'the underside of a platen 19 indexed 'thereabove in order that such platen may be rocked over to dotted line position as shown in Fig. 3 with the core box suspended therefrom above draw table 4.

A drier plate 28 will previously have been placed 'upon the core box and clamped thereon by means of arms 29 I the draw table will descend with the drier platenand the core resting thereon. When the drawing operation has been completed or nearly completed, shaft 25 may now be rocked in the opposite direction to return the platen and core box to the waiting arms 22 on turntable 2. A more detailed explanation of the operation of this mechanism will be found in my aforesaid co-pending application.

The core box top handling mechanism proper Referring now again to said drawing and especially Figs. 1-3 thereof, I provide five

uprights

31, 32, 33, 34 and 35 symmetrically mounted on turntable 2 about column 10 for rotation with such turntable about such column. Each of such uprights is located symmetrically radially inwardly of a corresponding pair of platen-sup porting arms 22 and a pair of

arms

36 and 37 is pivotally mounted at the upper end of each such upright for upward swinging movement above the core box 5 supported on the corresponding pair of turntable arms 22 and platen 19.

A piston-cylinder assembly 38 is pivotally mounted on turntable 2 beneath each such pair of

arms

36, 37, with piston rod 39 pivotally connected to such arms whereby the latter may be swung upwardly as shown in Fig. '3 or lowered into generally horizontal position as shown in Fig. 2. Such piston-cylinderassemblies will ordinarily be air operated since air under pressure is regularly employed in foundries inconnection with the operation of theother mechanism such as the usual core blowing and molding machine. An air hose such as 40 leads from air distributing valve 41 on column 10 to the lower end of each such cylinder, and rotationof the turntable 2 is caused to rotate such valve to control the admission of air to the piston-cylinder assemblies 38. Single-acting pistoncylinder assemblies are ordinarily satisfactory for my purpose inasmuch as the weight of the

arms

36, 37, and the core box tops carried thereby is sufficient to cause the same to descend when the air pressure is relieved.

Referring now more particularly to Figs. 4-7 inclusive, such valve 41 comprises an inner annular valve body member 42 mounted on column 10 and provided with an outwardly projecting flange portion having a groove 43 in its underside. Such groove extends circumferentially of member 42 from a point aligned with station B to a point slightly in advance of station E. Air under pressure is admitted to groove 43 at all times from air line 44 through inlet 45.

An upper ring of greater internal diameter than the diameter of column 10 rests on the outwardly projecting ll'ang'e of member 42 and is secured to lower ring 47 which engages the underside of such flange as best shown in Figs. 5-7 inclusive by means of bolts 48 provided with compres- 'sion springs 49 interposed between the heads of such bolts and ring 46 'to draw ring 47 into tight sealing engagement with the underside of the outwardly projecting flange portion of member '42. Rings and 47 are, moreover, rigidly connected to upright 33 by means of bracket 50 (see Fig. 3) so that rings 46 and 47 willbe caused to rotate with turntable 2 while inner member 42 of the valve remains stationary on column 10.

The

arms

36, 37, are notched as at 51, 52 to engage laterally projecting pins such as 53, 54, on a core box top 5'5 to raise and lower such top with corresponding movement of such arms.

Referring now to Figs. 1, 2 and 5 of the drawing, it will be seen that when

such arms

36, 37, index a core box top 55 into position beneath the sand reservoir 12 of the core blowing unit at station A the air hose 40 is not in connect-ion with groove 43 supplied with air under pressure from line 44 and consequently

such arms

36, 37, are lowered into substantially horizontal position with the core box top held beneath the blow plate 17 with but a slight anio'un'tof clearance afforded thereby. Upon now causirig elatnp table 16 to rise in conventional rnann'er, such table will first engage the superimposed platen 19 to lift it audits-core box 5 from the supporting arms 22. Such upward movement continuing, core box 5 will next ongage-ears box top 55 and lift it from arms '36 and 37nntil such top, core box, and platen are all firmly clamped between the clamp table 16 and the blow plate 17, whereupon the blowing operation may now take place. Of course, when table 16 is now lowered, the reverse procedure occurs and the top 55 is first redeposited on

arms

36, 37, and the platen 19 with core box (now containing the recently blown core) is returned to turntable arms 22. a

When the turntable now indexes to carry such cor box and its corresponding top to station B, air hose 40 will now connect with the end of groove 43 (Fig. 4) admitting air to the lower end of piston-cylinder assembly 38 to elevate

arms

36, 37, and the core box top, thereby afiording access to the core box 5 to permit an operator to deposit a drier plate thereon and perform any other necessary operations. When the turntable again indexes, carrying such core box and core box top to station C (Figs. 1, 3, 4 and 5), the core box top will remain in elevated position as shown to permit the above-described rock-over operation to take place without interference therefrom.

When the turntable now indexes to station D, the air hose 40 remains in communication with groove 43 and air pressure line 44 so that the core box top 55 is held in elevated position out of the way while an operator blows out the interior of the core box, resets loose pieces, sprays in parting compound, and performs other necessary operations.

When the turntable again indexes to station E, the final make-ready station, the connection of air hose 40 with the valve will have passed beyond the end of groove 43 (Fig. .4) so that air under pressure is no longer admitted to cylinder 38 and instead, such air hose will communicate through passage 56'to air exhaust outlet 57 (Figs.

Core box and sub-blow plate assemblies Referring now more particularly to Figs. 8-13 inclusive of the drawing, Fig. 8 illustrates a typical blow plate 17 adapted to be semi-permanently secured to the bottom of the sand reservoir 12. A typical arrangement of blow holes such as 58, 59, 60, 61, 62, 63, 64,65 and 66 is also shown in Fig. 8. Obviously, if a relatively small size core box is to be filled, it will be necessary to block off such of these holes as will not be employed in the operation. This may be accomplished by the employment of an auxiliary or sub-blow plate 67 adapted to mate with the underside of blow plate 17 and provided with only such holes as are required to admit the sand to the core box cavity. Where; the core to be blown is of a type not requiring that the core box be horizontally split or divided, such auxiliary or sub-blow plate 67 may be carried by

arms

36 and 37 and a core box 68 such as that illustrated in Fig. 11 employed, such core box being mounted on a platen 19 and handled as previously described. On the other hand, when the core box requires thus to be horizontally divided to form a cope and drag, the upper or cope section 69 may be secured to the underside of an appropriate sub-blow plate and the lower or drag portion 70 (Fig. 9) mounted on the platen. Such cope portion will then be carried with the sub-blow plate on

arms

36, 37, and when clamp table 16 descends after the blowing operation this movement will serve to draw the upper portion of the core from the cope. At station B, the operator will then place a drier plate 28 on the drag of a form corresponding to the exposed upper portion-of the core to protect and support the same during the rock-over and draw operation. As shown in Fig. 9, the majority of the blow holes in blow plate 17 are closed off by plate 67.

' In Fig. there is illustrated a sectional core box generallysimilar to that of Fig. 9 but of a larger size comprising a cope 7-1 and a drag 72. Accordingly different more widely spaced blow holes 58, 61 and 64 are utilized, the others being closed ofi by the sub-blow plate 67. Figures l2 and 13 similarly illustrate how blow holes 65, 61 and 66 may all be utilized or only the intermediate hole 61 utilized depending upon the transverse dimension of the core box. I

In view of the foregoing, it will be seen that I have provided mechanism whereby, in an automatic core blowing machine of the type described, a number of different types and sizes of cores may be blown in a single production run simply by providing such core boxes with corresponding independently supported sub-blow plates, with or without core box tops properly secured thereto depending upon the particular type of core to be formed. The rapidity of operation of the machine is in no way interfered with and, insofar as the handling of such sub-blow plates and core box tops is concerned, such operation may be wholly automatic. In the particular machine shown and described for purposes of illustration, it will be seen that as many as five different cores may be produced in a single production run, five difierent core boxes being employed. Of course, if a larger proportion of some particular core should be desired, then two or more of the core boxes may desirably be identical.

More generally, I have provided means whereby adapters, which may be sub-blow plates or core box tops or combinations of the same, may be carried by the same conveyor means such as turntable 2 which transports the core boxes and automatically moves into and out of operative position as required. The number of core boxes handled by one machine is obviously a matter of choice and my invention permits full operation of the machine regardless of whether a single type or several types of cores are being produced at any one time.

While the terms core and mold are usually accorded limited meanings in the industry a core is, of course, a special type of mold and in the claims appended hereto the term mold is used in its broad significance to include cores and the like as well as the usual molds as produced in squeeze molding machines, for example. The mold-enclosing means, such as a flask or core box, is also known in a variety of forms. As a matter of fact, it is feasible to blow many types of molds, as commonly so named, on the core blowing machine, or the blow plate may be tilized merely as a squeeze head for the squeezing of molds in cooperation with table 18. Of course, a regular jolt-squeeze or other standard molding machine would ordinarily be preferred.

Instead of transporting such adapters on

arms

36, 37, different patterns may be mounted thereon and the machine utilized as a squeeze molding machine producing a variety of different molds. The well-known Osborn Model 218-PV vibrating squeeze machine may thus be substituted for the core-blowing unit illustrated. Likewise, when in a molding operation different squeeze boards are necessary for different molds due to bars in the flasks arranged in different positions, such squeeze boards may be carried by

arms

36, 37. These boards are ordinarily provided with biscuits which project between such bars during the squeeze.

The power means for indexing turntable 2 may desirably comprise a piston-cylinder assembly 73 and a rack mechanism 74 operative to drive such turntable in the manner described in Ellms application Serial No. 273,093, but other drive means may be utilized. The means supporting the core box tops or the like above the core box may be modified to raise and lower such tops perfectly vertically but it is preferred to employ means operative to swing them back out of the way as shown.

Figures 14-16 embodiment Referring now more particularly to Figs. 14, 15 and 16 of the drawing, another embodiment of my invention is there illustrated having certain advantages in construcarms 75 are in normal horizontal position.

tionand .of operation. Sets of; core. boxtop; sup-s porting .Iarms. 75,.gencrally' similar to..such arms 36. and. 31 described. above arepivotally carried by uprightstands' such as 176 (similarto sands lib-35). mounted onturntable 2' radially inwardly of the respective pairs of platen and core box supporting arms 22' in the. same relative positions shown in Figs. 1 and lot the drawing. Downward swinging of such arms .75' about pivot '17 is limited by adjustingocrews: 78.. Upwardly open. trunnion cradles. 79 adjacent the outer ends of the arms are adapted. .to. receive corresponding trunnions projecting from the core box" tops or sulnblow. plates.

Mounted on head Z adjacent column is a. vertically disposedfluid. pressure cylinder 80: {ordinarily pneumatic) carried by horizontaltmmnions 81 and having a down wardly projecting .piston 'rod. 82i protruding therefrom. Such. fluidpressure piston-cylinder assembly may be of either the'double-aetingtype: or spring-return type. An adjustable stop 83- together withtension spring83' limits swinging movementof the upper end of. such cylinder toward column 10, and the lower end 84 of piston rod 82-is adapted to engage. in a cup-shaped depression 85 inlever arm tilt-projecting toward column 10 from pivot 77 and unitary with such core-box supporting arms 75. Consequently, when air pressure is: admitted to the upper end of' cylinder 80, piston rod 82', 84 is moved downwardly to engage in such hollow'SS and to rock lever arm86-to lift the corebox top supporting arms75 to dotted line position.

Also-mounted on column 10 is a generally fiat cam trackformed in twosegments bolted to such column by means of

bolts

87 and 88. Such cam track comprises a horizontal portion-89"extcnding from station B (see also of'camt-rack portion 89 and in effect forming a continuation thereof. A stop 92 preventspivotal movement of suchlatch member upwardly out of alignment with horizontal fiat portion 89 and a tension spring 93 serves normallyto prevent member 91 from dropping downwardly out of suchalignment. A roller 94 is mounted for-rotation on the end. of lever arm 86 and projects above latch member 9E when core box top supporting When, however, piston rod 82 is depressed to rocklever arm 36 downwardly, such roller 94 will engage the top of latch member "91 to rock the latter downwardly against the force of tension spring 93 until such roller has slid past, whereupon member 91 will again resume normal position with its underside parallel to earn surface 89. Now, when piston rod 82 is again retracted, lever arm 86 will rock slightly upwardly until roller 94 engages the underside of latch member '91, preventing further lowering of core box top supporting arms 75. When table 2- is thereafter indexed 'to bring this particular set of arms 75 to station C and then station D, roller 94 will roll alongthe underside of cam track 89 and continue to hold arms 75 in elevated position. During further indexingfrom station D to station E, however, roller 94 will be caused to travel along the underside of upwardly sloping cam track portion 90 so that arms 75 will be graduallylowered without shock or jarring back to solid line position. Consequently, arms 75 and-the core box top "supported thereby will be in horizontal position above the core box when the turntable now indexes from stationE to the core blowing station A.

An important advantage of the last-described inechanism is its relative simplicity and small number of moving parts, Thus, but a single pneumatic piston-cylinder assembly is. required to rock the core box supporting arms and such cylinder is, moreover, mounted in one position and need not travel with the turntable. This onsiderably .simplifiesthe problem otsupplying ainpressure. thereto, The. cam: track and associated latch mochanism, being a, simple mechanical device, requires little, if any, maintenance and, is substantially tr0nble-free in operation.

Each stand 76' may be further braced. againstthe others,

by means. ot braces .95.- engaging; aring encircling column 10. Of course, the operation of the machine may be controlled-by an operator simply manipulating appropriate air'valves, but-ibis preferred that, such, valves, be times controlled and operation fully automatic. An upper limit.'

switch-.9.6 and. a lower limit switch .97 may be; provided as shown inFig, l4, to safeguard the. machine, the lower,

possible tOl prevent indexing unless, roller 94 has. been. brought below latch 91 and the piston: rod end 8.4. raised.

out of pocket 85. As the turntable or equivalent. indexing means, revolves,-the core box tops or like, membersare raised; at. station B, maintained in such elevated, position as they move to..stations C and D, and graduallyloweredrtohorizontal position as they move to station E, They arethus rout. of the way at the drawstation but returned tooperative position at the blow station A.

Other modes of applying the principle of the invention maybe. employed, change. being made as regards the de tails. described; provided the. features; stated in any of the following claims: or the-equivalent of such be employed.

I thereforeparticularly point out and distinctly claim as .my invention:

1. In mold making mechanism having a turntable mounted for rotation about a vertical axis, a molding station. adjacent said turntable, a mold drawing station,

adjacent said turntable, a platen-supporting means on said turntable adapted to support a plurality of platens arranged eircumferentially thereof, indexing means operative to rotate said turntable to index such platens from said .molding station to said draw station and from the latter station. tosaid, molding station, said platen-supporting means being arranged to support one. platen at said draw station when another platenis thus supported, at said molding station, molding means at said molding, station operative to, lift a platen from said. supporting.

means for performance of the molding operation and. to return the same thereto. after, completion of such operation, rock-over means at said, draw station operative. to lift a platen from said supporting means and invert the same, and a draw table mounted .for vertical reciprocw tion beneath; such platen wherethus heldin such inverted position; the combination 0t uprights. symmetrically mounted on; said turntable about such axis andradially inwardly from a respective saidplaten-supporting'means, a pair 0t arms pivotally mounted on each said vupright for up-and-down swinging movement in unison above a said respective platensupporting means, said arms being adapted vertically removably to support adapter means for core boxes, and; the. like in horizontal position spaced vertically for engagement bysuch core boxes and thelikc when said; platens are lifted by said, molding means, whereby said adapter means may thus be picked up, and elevated by .suchcore boxes and the like, and means operative to, swing said arms and such adapter means. upwardly at other stations to avoid interference with. operations at such stations.

2. In core making mechanism having a turntable adapted to. be indexed from; station. to station, a core- 'blowing machineataone such station, and core boxes supported, by said turntable for elevation therefrom, at such core-blowing station; the combination ofuprights sym metrically mounted on said turntable about the axis of the latter and radially inwardly of said respective com boxes;-a pair of arms pivotallymounted on eachwaidl seal-gals upright for up and-down swinging movement iniuni son.

above a said respective core box, each said pair of arms being adapted to removably support a core box top in' horizontal position spaced above a said respective core box for mating engagement and vertical lifting thereby and for mating engagement of the core box top with the core blowing machine when said core box is thus elevated at such core-blowing station, and means operative to swing said arms and core box tops upwardly subsequent to the core-blowing operation to avoid interference with operations at later stations.

J 3. In core making mechanism having a turntable adapted to be indexed from station to station, a coreat such ilraw "station 1' to" avoid interference 3 1 platen lifting and-inverting operation, saidlifting means comprising a stationary generally vertcal piston-cylinder assembly mounted above said conveying means adapted forcibly to extend said piston downwardly, horizontally pivotaly mountedvm'embers on said conveying means" adapted to support such adapter means and having ex-' tensions projecting beyond such pivotal mountings adapted to be engaged sequentially by said piston when indexed blowing machine at one such station, and core boxes supported by said turntable for elevation therefrom at such core-blowing station; the combination of uprights symmetrically mounted on said turntable about the axis of the latter and radially inwardly of said respective core boxes, a pair of arms pivotally mounted on each said upright for up-and-down swinging movement in unison above a said respective core-box, each said pair of arms being adapted to removably support a core box top in horizontal position vertically spaced above a said respective core box for engagement and lifting thereby when said core box is thus elevated at such core-blowing station and for engagement of said core box top with the core-blowing machine, and fluid pressure piston cylinder power means operative to swing said arms and core box tops upwardly subsequent to the core-blowing operation to avoid interference with operations at later stations.

4. In indexing means for core boxes and the like adapted to be indexed from station to station and to sup port core boxes thereon; support means operative to removably support a corresponding core box top or the like in horizontal position spaced directly above a respective core box at one such station for vertical registration therewith and movable to shift such tops to nonobstructing positions at another station, and lifting means operative to lift said core box directly vertically into mating engagement with said top spaced thereabove at said first station, and to lift said core box top into engagement with the core-blowing machine.

5. In core making mechanism having a turntable adapted to be indexed from station to station, a core blowing machine at one such station having a horizontally disposed blow plate, and core boxes of diiferent types supported on said turntable for indexing into position beneath said blow plate; corresponding core box tops for said core boxes, support means on said turntable adapted removably to support said tops in horizontal positions spaced directly vertically above said respective core boxes, sub-blow plates secured to said tops adapted to mate with said first-mentioned blow plate, and elevating means at such core blowing station operative directly vertically to elevate a said core box from said turntable to engage and lift a corresponding top and sub-blow plate from said support means to press the sub-blow plate firmly against said first-mentioned blow plate.

6. In mold making mechanism having platen conveying means operative to transport a platen in horizontal position from station to station with dwells at such stations, such platen having mold-enclosing means thereon, molding means at one such station operative to lift such platen from said conveying means for performance of a molding operation and to return such platen to said conveying means after performance of such molding operation, and draw means at another such station operative to lift such platen from said conveyor and invert the same for drawing of such mold and then to return such platen to said conveyor; the combination of lifting means mounted on said conveying means adjacent each such platen adapted to support adapter means in horizontal position directly vertically spaced above such mold-enclosing means on such platen at such molding station and to hold such adapter means at a still greater elevation to the corresponding station, thereby to swing said members and such adapters supported thereby upwardly, latch; means operative automatically to engage said extensions of said members thus depressed to maintain them in such position upon subsequent retraction of said piston, and-a guide track constituting a continuation of said latch means effective to engage said extensions during further indexing of said conveying means, said guide track sloping upwardly before reaching such molding station to permit said extensions to rise and said pivotally mounted mem bers therefore to descend to lower such adapter means into horizontal position directly vertically spaced above such mold-enclosing means ior subsequent engagement by the latter.

7. In indexing means for core boxes and the like including a turntable rotatable about a stationary central column and adapted to be indexed from station to station and to support such core boxes during such indexing, one said station being a blow station including means to elevate a core box thereat; means on said table rotatable therewith adapted to support core box tops and the like comprising a stand on said turntable radially inwardly of a corresponding core box, a core box top supporting member horizontally pivotally mounted on said stand and having an extension projecting radially inwardly from such pivotal mounting toward said column, a generally vertical piston-cylinder assembly mounted on said column above said turntable at one such station and operative forcibly to extend said piston in a downward direction to engage and depress said radially inwardly projecting extension of a said core box supporting member thereby to rock the latter upwardly, latch means on said column at such station operative automatically to engage said extension of said member to hold said extension thus depressed despite subsequent retraction of said piston, a guide track mounted on said column and partially encircling the latter constituting a continuation of said latch means effective to engage said extension to hold it depressed during further indexing of said turntable, said guide track sloping upwardly adjacent said blow station to permit said extension gradually to rise and said pivotally mounted member to descend, and stop means limiting such downward movement of said member to position a core box top carried by said member in horizontal position directly vertically spaced above a corresponding core box carried by said turntable at said blow station.

8. In combination with a turntable adapted to transport core boxes and the like from station to station; means operative to raise and lower core box tops and the like comprising a support on said turntable for such top, means pivotally mounting said support on said turntable ior upward swinging movement to lift such top to make accessible a subjacent core box carried by said turntable, power means permanently located at one such station operative there to engage said pivotally mounted support to swing the same upwardly, and guide means adapted thereupon to engage said support to maintain the latter thus elevated during a portion only of subsequent rotation of said turntable.

9. In indexing means for core boxes and the like adapted to be indexed from station to station and to support core boxes thereon; support means operative to support a corresponding core box top or the like in horizontal position spaced directly vertically above a respective core box at one such station and to shift such tops to nonobstructing positions at another station comprising a sup? portior such core boxstop mountedfor movement with saidindexing means and also for such shiftingmovement relative to a core box transported by said indexing means,

power means at one such station operative thus to shift said. support, and guide means thereupon operative to engage said support during a portion of the indexing cycle of said indexing means to maintain said support in such shifted position with such top therefore in such non-obstructing position.

110. In indexing means for core boxes and the like including a turntable adapted to be indexed from station to station and to support core boxes thereon, one such station being a blow station having core box lifting means and a blow plate between which such box is adapted to be clamped; core box top supporting means mounted on said turntable and rotatable therewith adapted rcmovably to support core box tops and the like in horizontal position spaced directly vertically above a respective core box at such blow station, said lifting means at such blow station being operative vertically to elevate said latter 10 UNITED STATES PATENTS 567,884 Brown Sept. 15, 1896 1,025,737 Brown May 7, 1912 1,526,078 Murphy Feb. 10, 1925 15 2,259,768 Naylor et a1. Oct. 21, 1941 2,636,230 Morton "Apr. 28, 1953 OTHER REFERENCES The Iron Age, vol. :169, issue 20,. May 15, 1952, pages core .box to engage and lift said top forcibly against said.

supporting means, upwardly and inwardly at another station.

References Cited in the file of this patent