US2545799A - Apparatus for producing sand cores and the like - Google Patents

Description

March 20, 1951 R, R, SNOW 2,545,799

APPARATUS FOR PRODUCING SAND CORES AND THE LIKE Filed April 26, 1946 3 Sheets-Sheet l N @Zen (521011.?

2,545,799 APPARATUS FOR PRODUCING SAND C ORES AND THE LIKE Filed April 26, 1946 R. R. SNOW March 20, 1951 s Sheets-Sheet 2 March 20, 1951 R. R. sNow APPARATUS FOR PRODUCING SAND CORES AND THE LIKE Filed April 26, 1946 3 Sheets-Sheet 5 3 o ew 2 0120a Patented Mar. 20, 1951 APPARATUS FOR PRODUCING SAND CORES AND THE LIKE Robert R. Snow, St. Catharines, Ontario, Canada,

assignor to General Motors Corporation, Detroit, Mich., a corporation of Delaware Application April 26, 1946, Serial No. 665,231

7 Claims. (01. 22-10) This invention relates to an apparatus for producing sand cores and the like.

Among the objects of the invention are the following: to provide improvements in apparatus for producing cores and the like; to provide improvements in core making apparatus and the like wherein the operations are largely automatic; to provide improvements in apparatus for producing cores and the like whereby there is a saving of labor and whereby heavy labor commonly associated with core making has been largely, if not entirely, eliminated; to provide improvements in core making apparatus whereby cores can be more accurately formed on account of being automatically drawn by the apparatus, thus eliminating human inaccuracies; and to provide improvements in core making apparatus whereby the core boxes are quickly interchange.- able. Other objects and advantages of the invention will become more apparent as the description proceeds.

The accompanying drawings forming a portion of this specification illustrate a machine in 2.0-- cordance with one embodiment of the invention.

In the drawings:

Figure 1 is an elevational view of the machine.

Figure 2 is a diagrammatic view showing the relative position of .certain parts of the machine at one point in a cycle of operation.

Figure 3 is a view illustrating the means for intermittently rotating the turntable of the machine and for actuating control cam means.

Figure 4 is a diagrammatic showing of one form of hydraulic control system .or circuit and illustrating the manner in which the several operations are hydraulically operated and com trolled.

Fig. 5 is a somewhat diagrammatic view showing one form of means for rotating a core box part carried by the turntable of the machine.

Figure 6 is a diagrammatic view illustrating a magnetic means and control system for picking up a core box top from one position and moving the same to another position.

Figure '7 is a view with parts broken away and parts in section illustrating an evener device.

General description so that it can be turned 180 at certain points in the cycle of operation of the machine. The

turntable and arms are driven by an electric motor and speed reducing means mounted in the base of the machine. The turntable is so controlled that it rotates 90 at a time and indexes accurately into any one of four positions. At one station (hereinafter considered as the first station or station No. I) a core box top is raised automatically from the turntable, moved in a horizontal plane to a position over the lower half of the core box carried by the arms and finally lowered into position on the bottom half of the empty core box. At the same time a core box top is being removed from a filled core box at a station 180 from the first station, then moved in a horizontal plane above the turntable and then lowered into a position on the turntable. The core box top removed from the filled core box then moves with the turntable until it is in position at station No. I where it is in position to be picked up and placed on the bottom of the core box.

Th means for raising, lowering and moving the upper parts of the core boxes comprises electromagnets and hydraulically operated means which raise and lower the magnets and which move the magnets in a horizontal plane when they are in their raised positions.

The station spaced 180 from the first may be considered as station No. 3 as there is a station 90 from station No. I atwhichthe core box isfilled with core sand by a core blowing machine. The core blowing station may be considered as station No. 2. After the upper half of the core box is removed from the lower half at station .No. -3 the operator places a core drier over the sand core and fastens it in place to the lower half of the core box. The turntable then rotates 90 to station No. 4 where the core is drawn. During rotation of the turntable from station No. 3 to station No. 4, the lower half of the core box, with the core and the core drier, is caused to revolve 180 on its horizontal axis, thus turning it upside down. With the turntable Stationary at station No. 4, a hydraulic piston raises a plate or table under the core drier and core. The plate carries an evener device which is Operated automatically by air pressure, The purpose of the evener is to ensure that the pressure on the core .drier is uniform at all points of contact, to compensate for-any irregularities in the shapes of the various core diners and to produce a core drawing operation at right angles to the parting line. The turntable then automatically moves 90 to station No. l and during its movement the lower half of the core box revolves 180 on its 3 horizontal axis, thus turning it right side up. When at this station the bottom half has its top half placed thereon as previously described.

Detailed description The embodiment of the invention shown in the drawings comprises an apparatus for producing sand cores and the like for use in foundry operations. Referring to Figure l of the drawings IE] is a housing above which is a turntable l 2 having four pairs of arms I4, each pair being90 from the next adjacent pairs (see also Figure 2) Each pair of arms adjacent its outer ends has the bottom half is of a core box carried thereby and so mounted that the same can be turned 180 on a horizontal axis. by ll. Above the turntable is a slidable member i3 carrying at each end similar electromagnets 20 and electrical and hydraulic devices foriactuating the same. Slide I8 is moved in a horizontal plane by means of a hydraulic cylinder 22, piston 24 (see Figure 4) and rod 26. The cylinder 22 is fixed to a stationary support 23, which in turn is carried by the upper portion of a stationary post indicated generally by 25. The magnets 20 are actuated in a vertical direction by means of similar hydraulic cylinders 28, pistons 30 (seeFigure 4) and piston rods 32. The cylinders 28 and associated parts are carried by the slide Hi. In Figure l the slide 58 is shown in its right hand position and the magnets are shown in lowered positions contacting the upper halves ll of the core boxes at stations I and 3. As soon as the electromagnet atstation 3 has removed the core box top from the filled core box, the operator places a core drier over the core sand and fastens 'it in place to the lower half of the core box by clamps.

In order to properly handle the upper half of the core box by the electromagnet, it is necessary to have the body of the box made of non-magnetic material (aluminum) to the top of which is fastened a fiat steel plate to be attracted by the magnet when energized.

At the right hand side of the housing It] (Fig- .ure 1) is shown a'means for looking or holding 'on a piston rod 43 and during vertical movement is guided by two vertical rods 44. The piston rod 43 is connected at its opposite end to a piston 46 in a cylinder 43 and is caused to move up and down by the pressure of oil or other suitable fluid in the cylinder. Mounted on the plate 42 is an air cylinder 58 which is supplied by air pressure through a flexible hose 52. The air is regulated by a control valve 53 operated by a solenoid 54.

The solenoid is energized by limit switch 65 actuated by an adjustable screw 66 movable with the table 42. In the air cylinder 50 are two pistons 55 free to move horizontally and by means of piston rods 55 apply pressure against the hubs 5B of four leveling fingers represented generally by El! (Figures 1, 4 and '7). Each leveling finger also includes an arm portion 5! connecting the hub portion 5 8 with a portion 60' of a leveling The core box tops are indicated 4 finger adapted to contact the core drier. Between the hubs of the leveling fingers are similar fiber washers 62. Each piston rod 56 has a portion 59 at its end away from its piston 55 of smaller diameter than the portion adjacent its piston, thus forming a shoulder at the junction between the two portions. Between each shoulder and the adjacent fiber washer 62 is a washer 61 of stepped shape in cross section. The portion 59 of each piston rod passes through a washer 6!, two fiber washers 62, and the hub portions 58 of two leveling fingers. Thus the leveling fingers are pivoted about the portions 59 of the piston rods. Stops 63 are fixed to the plate 52. The leveling fingers are biased in upward position by means of springs 64 which have one end of each in contact with the plate 42 and the opposite end of each contacting the underneath portion of the free end of a leveling finger away from its hub which is pivoted on a piston rod portion 59. The operation of the core drawing means is as follows: Oil under pressure is admitted to the cylinder #8 which raises the plate on table 42 and parts carried thereby under the core to be drawn. The leveling fingers make contact with the bottom of the core drier [5 (Figure 1) and adjust themselves by pivotal movement of their hubs on the piston rod portions 59. This compresses each spring 66 slightly. Air is now admitted to the air cylinde 50, the pistons 55 therein are forced outwardly a small distance. This outward movement of the pistons causes corresponding movement of the piston rods 56 so that the shoulders formed thereon force the washers 6 I, 62 and hubs 58 outwardly and tightly clamp or squeeze the same between the shoulder and stops 63, thereby holding the fingers in'position. In other words the squeezing action applies pressure to the sides of the hubs 58 and washers whereby frictional forces therebetween hold the fingers against pivotal movement on the smaller diameter portions 59 of the piston rods. Latches holding together the core dried and inverted bottom part of the core box are tripped open and oil pressure .is removed from cylinder 48, allowing the plate or table 42 to move down carrying the core drier and core with it to a position from which they may be removed by the operator. The core drier and core may now be placed in an oven for baking the core.

During movement of the turntable from station 3 to station 4 the bottom half of the core box and the core drier fixed thereto are rotated 180 to invert the same. During movement of the turntable from station 4 to station I the inverted bottom half of the core box is rotated 180 to again bring the same into its right side up position so that the top half of the core box can be placed thereon at station l.

The means for rotating the bottom portion of the core box, etc., as just described, is illustrated in Figures 1 and 5. Carried by the turntable is an electric motor 70 connected to a gear pump 12. The inlet side of the pump is connected by pipe 74 to an oil supply tank T6. The outlet side 18 of the'gear pump leadst'o a volume control and then to a four-way valve 82 having an actuating element 19. The actuating element of the 'four-way valve is operated by a stationary cam 8 mounted above the turntable, said cam being fixed to post 25. Oil, controlled by the valve 82, enters a cylinder 88 carried by the turntable causing a piston 88 to move a chain turning sprocket 9| is fixed to a shaft 89 which, in turn, is fixed to the bottom of a core box. The movement of the piston 86 is just suific'ient to rotate 180 the bottom of the core box with the core drier clamped thereto. The foregoing action takes place while the turntable is moving from station 3 to station 4. When the cam 84 dis engages the actuating element 19 of the valve 82 (by movement with the turntable of the valve 82 and its adjusting element 19 past the cam) the oil pressure is reversed in cylinder 86 thereby moving piston 88 in the reverse direction and causing the return of the bottom of the core box to its original right side up position. This action takes place while the turntable is rotating from station No. 4 to station I.

After the turntable has moved to station No. I and a core box top applied thereto as previously described, the now closed core box is moved to station No. 2 where the core sand mixture is blown into the core box by a core blowing machine of any conventional design automatically controlled by operation of the core making machine.

In Figure 3 is illustrated a means whereby the turntable may be actuated, the mechanism shown being located in the housing I 8. An electric motor 96 rotating at constant speed drives a rotating disc 98 at a constant speed. A suitable variable speed means 89 and speed reducing device I00 reduce the speed of the rotating disc greatly as compared with that of the electric motor. For each revolution of the disc 68 the turntable I2 is indexed 90 by means of a ratchet clutch I 02 which drives the turntable shaft I04. In Figure 3 is shown a camshaft I06 which rotates continuously at constant speed. The camshaft is driven by the electric motor and speed reducing means by means of a chain or belt I01. To the camshaft are fixed a plurality of control cams for operating various hydraulic controls, one of these cams I08 being shown in Figure 3.

Figure 4 shows what may be considered as the main hydraulic system and illustrates the man-' to the tank I24 by means of a return header I30.

In Figure 4 are shown cams I08, I06, H0, III, H2 and I I3 which control various hydraulic circuits. It will be understood that the cams I08 to H3 inclusive are rotated by the camshaft I06 which rotates continuously when the machine is being operated.

Cam I08 operates a pilot valve I 32 which causes a four-way valve I34 to allow oil under pressure to enter one end of cylinder 22 (see also Figure l), to thereby move the piston 24 in one direction. This causes the slide I8 and two magnets 20 carried thereby to traverse to one end of the stroke. Further rotation of the cam I08 causes reverse operations of the pilot valve I32, fourway valve I34 and piston 24. This causes the slide and magnets to traverse to the opposite end of the stroke. A volume control I36 is provided in the line leading from the high pressure header I26 to the four-way valve I34 to regulate the speed at which piston 24 travels. Oil line I31 leads from the four-way valve I34 to the return header I30.

Cam I09 actuates a pilot valve I40 which controls a four-way valve I42 which in turn allows oil under pressure to enter one end of hydraulic cylinders 28 (see also Figure 1). These cylinders operate in parallel. Oil pressure in the cylinders 28 cause the pistons 30 therein to move in one direction to simultaneously raise the two magnets 20. Further rotation of the cam I09 reverses the operation of the four-way valve I42 to move the pistons 30 in the opposite direction in cylinders 28 to lower the magnets simultaneously. A vol ume control I44 is provided in the line leading from the header I26 to the four-way valve I 42 to regulate the speed of travel of pistons 38 in cylinders 28. Oil is returned to the header I30 from the four-way valve I42 by oil line I45.

Cam H0 actuates a four-way valve I48 which controls flow of oil under pressure from header I26 to the opposite sides of piston I50 in hydraulic cylinder I52. Movement of the piston I50 operates air valve I54 on the core blowing ma chine I56. Oil line I51 leads from the valve I48 to return header I30.

Rotation of cam I I I actuates a four-way valve I58 which causes oil under pressure to enter cylinder 36 to thereby move the piston 31 therein in one direction to move the dog 40 into the V-notch 32 and thereby hold the turntable I2 in indexed position. Oil under pressure also flows into one end of a cylinder I60 to move a piston I62 therein to apply a brake I64 to the turntable driving shaft. Further operation of cam I II causes reverse operations of the four-way valve and pistons 31 and I62 to release the dog 40 from the v-notch 32 and to release the brake. By means of line I65 oil is returned to header I30 for return to tank I24.

Rotation of cam II2 actuates a four-way valve I68 which causes oil under pressure from header I26 to enter one end of a cylinder I10 and move piston I12 therein in one direction to move the hopper I14 of the core blower to operating position at station No. 2. Further rotation reversesthe operation of the four-way valve and piston I12 to thereby move the core blower hopper to inoperative position away from the turntable. Oil line I15 leads from the valve 168 to the return header I30.

Rotation of cam II3 operates a four-way valve I16 which causes oil under pressure to enter one end of cylinder 48 to raise the piston 46 therein and plate 42 of the core drawing mechanism at station 4. Further rotation of cam I I 3 causes reverse operation of the four-way valve I16 and piston 46 to lower the core drawing mechanism. A volume control I 18 is provided in the line leading from the header to regulate the speed of the piston 46. Oil is returned by pipe I18 from the four-way valve I18 to the return header I30.

The electric circuit for one of the magnets is illustrated diagrammatically in Figure 6. The circuit for the other magnet is the same as that illustrated in Figure 6. For lifting the top halves of the core boxes the magnets are energized by current flowing in one direction through the magnet coils. To release the top halves of the core boxes reverse current is temporarily passed through the magnet coils to destroy residual magnetism. In the position shown in Figure 6 the magnet 26 is in elevated position above the core box. Upon downward movement of the mag net, by means of the hydraulic cylinder 28, piston 30 and rod 32, the limit switches 228 and 229 are actuated causing 228 to close and 228 to open. Switches 228 and 229 are mounted on each end of the magnet and are caused to operate by mechanical contact with the top of the core box. At this time switches 230 and. 23I are in their normally closed positions. A circuit is then established from Ll, connections 239, 246, 242, switch 23!, connection 244, switch 228, connection 245, switch 236, connection 248, and then by parallel circuits through the coils of contactor CRi and time relay TR! to L2. Ihe circuit from 248 through the coil of CR! is by connector 258, coil 252 of CR1, and connector 254 to L2. The circuit from 248 through the coil of TB! is by means of connector 256, coil 258 of TRI, and connector 260 to L2.

Energization of coil 255 of TR! actuates an arm 253 carrying blade 26! which closes contact 221. Energization of the coil 252 of CR! raises an arm 262 carrying blades 264, 266, and 268, which close contacts 22!, 223 and 232 respectively. This energizes the magnet by means of the circuit from Li, contact 22i closed by blade 254, connector 216, magnet coil 222, connector 212, contacts 223 closed by blade 266, and then to L2. lhe hydraulic cylinders then lift the magnets and core box tops. There is mechanical lag which allows the limit switches 228 and 229 to return to normal positions (switch 228 open and 229 closed) before the core box top is moved. A circuit is then established from L! through connector 239, conductor 2451, switch 229, connectors 216 and 218 to contact 232 closed by blade 268, connector 236, coil 252 and connector 254 to L2. by means of connector 242, switch 23! and connector 244 to connector 218. Circuit portions 256 and 256, coil 258 of TRl, and connector 260 to L2 are in parallel circuit relation with the corresponding circuit through the coil 252 of CRI. The foregoing circuit holds while the magnet and top half fo the core boxes are lifted full height by hydraulic cylinder 28 and traverse-d to the opposite end of the horizontal traverse of slide it by hydraulic cylinder 22. At this time limit switches 235 and 23l are opened by member 233 carried by the slide. Circuit from Ll to L2 is then from 239, 256, 229, 216, 2718, contact 232 closed by 268, 286, and then through the coils of CR! and TR! in parallel to L2.

The magnet 26 is then lowered to set the top half of the core box on the turntable or onto an empty lower half of a core box, as the case may be. When the mechanical slack is taken up the limit switch 228 is closed and 225 is opened. Opening of.229 (since 23! has been opened previously as described) cuts off current from coil 252 of CRI and coil 258 of TRI, thus deenergizing the same. Although coil 258 of TRI is now deenergized the blade 25! still closes contact 221 for a period of about two seconds. Deenergizing coil 252 of CR! causes blades 264 and 266 to drop down closing back contacts 225 and 224 respectively. A demagnetizing circuit is then set up through the coil 222 of the magnet 26. This circuit is from Ll through 239, back contact 224, connection 212, magnetizing coil 222, connector 216, back contact 225 (closed by 264), connector 290, current limiting resistor 226, contact 22'! still closed by 26i, and connector 266 to L2. At the end of about two seconds the blade 26A of time delay relay opens contact 22? to open the demag- A circuit is also established from 2413 apparatus constructed in accordance with a spe-:

cific embodiment of my invention it will be apparent that I have provided a core making machine adapted for automatic operation and at adjustable speed so that the operation can be timed to suit the cores being produced. Also provided is a power driven, accurately indexed, and automatically operated turntable. The machine further includes automatic means for turning over the core box containing a core, automatic means for blowing the core and automatic means for drawing the core.

It will be understood that various changes and modifications in the specific embodiment of the invention described in detail herein, may be made without departing from the spirit and principles of my invention and I do not intend to limit the patent granted for my invention except as necessitated by the prior art.

I claim:

1. In apparatus of the class described, a turntable, a plurality of core boxes carried by the turntable, means for rotating the turntable to a plurality of stations, one of said stations being a core box top removing station and a diametrically opposite station being a core box top replacing station, a slidable member above the turntable movable horizontally back and forth in the vertical plane through the axis of the turntable and said core box top removing and replacing stations, an electromagnet at each end of the slidable member, hydraulically operated means for moving the slide and electromagnets in a horizontal plane above the turntable, hydraulically operated means carried by the slide to move the two electromagnets in unison in a vertical direction while the slide is at each end of its path of travel, means for energizing the electromagnets to pick up core box tops when the slide is at one end of its travel and after lowering of said electromagnets into contact with said core box tops, means for maintaining the energization of said electromagnets while the electromagnets are raised, while they are moved by said slide to the opposite end of its path of travel and while they lower the core box tops carried thereby, and means for deenergizing the electromagnets to release the core box tops after the electromagnets have been lowered at said opposite end of the path of travel of said slide.

2. In apparatus of the class described, a turntable, a plurality of core boxes carried by the turntable, means for intermittently rotating the turntable to a plurality of stations, one of said stations being a core box top removing station and a diametrically opposite station being a core box top replacing station, a slidable member above the turntable movable horizontally back and forth in the vertical plane through the axis of the turntable and said core box top removing and replacing stations, an electromagnet at each end of the slidable member, hydraulically operated means for moving the slide and electromagnets in a horizontal plane above the turntable, hydraulically operated means carried by the slide to move vertically the two electromagnets in unison, automatic means for energizing the electromagnets to pick up core box tops when the slide is at one end of its travel and after lowering of said electromagnets, for maintaining the energization of said electromagnets while the electromagnets are raised, while the electromagnets and core box tops are moved by the slide to the opposite end of its path of travel and while the electromagnets are lowered and for deenergizing the magnets to release the core box tops after the electromagnets have been lowered ing the turntable in a stationary position during movement of the slide and electromagnets.

3. In an automatic core making machine having a core blowing station, a core drawing station, a core box top removing station and a core box top replacing station; a turntable; a core box carried by the turntable; mechanism for rotating the turntable to said plurality of stations; mechanism for placing a core box top on the bottom of a core box at one of said stations consisting of a horizontally movable slide above the turntable and a vertically movable device carried by the slide adapted to raise a core box top from the turntable when the horizontally movable slide is in one position of movement and to place the same on the bottom of a core box when the slide is at another position of movement; mechsaid turntable and then placing the same on.

the turntable at a point radially inward of the bottom of the core box from which the top was removed, and control means for sequentially actuating said mechanisms at said stations.

i. In apparatus of the class described, a turntable, four core boxes carried by the turntable at 90 intervals, automatically operated mechanism for rotating the turntable sequentially to four stations at 90 intervals, the first station being a station at which a core box top is placed on a core box bottom, the second a core blowing station, the third a core box top removing station and the fourth a core drawing station, a horizontally movable slide above the turntable in the vertical plane through the axis of the turntable and stations one and three, and vertically movable mechanism at each end of the slide to pick up a core box top from a filled core box on the turntable at station number three at the same time that a previously removed core box top is being picked up from the turntable at station number one and while the slide is at one end of its path of travel, said vertically movable mechanism placing the core box top picked up from the filled core box at station number three onto the turntable and placing the core box top picked up from the turntable at station number one onto a core box bottom when the slide is at the other end of its path of travel.

' 5. In an apparatus of the class described, a turntable, four core boxes carried by the turntable at 90 intervals, automatically operated mechanism for intermittently rotating the turntable 90 at a time to four stations with a core box at each station, the first station being a station at which a core box top is placed on a core box bottom, the second a core blowing station, the third a core box top removing station and the fourth a core drawing station, a member above the turntable slidable horizontally back and forth in the vertical plane through the axis of the turntable and stations one and three, a first cylinder and fluid pressure actuated piston for moving said slidable member back and forth, a cylinder carried at each end of said slidable member, a fluid pressure actuated piston in each cylinder at each end of the slide and movable in a vertical direction, an electromagnet movable by each vcr iically movable piston, fluid pressure connections to said first cylinder for actuating the piston therein to move the slidable member back and forth, fluid pressure connections to each of the cylinders carried at the ends of the slidable member to move the pistons therein and the two electromagnets in unison in a vertical direction when the slide is at each end of its path of travel to sequentially raise and lower the two electromagnets, and electrical circuits to energize the two electromagnets when they are lowered onto the two core box tops on the turntable at stations one and three, to maintain the energization of the two electromagnets while the two vertically moving pistons are moving upwardly, while the slide is moving to the other end of its path of travel and while the vertically moving pistons are being lowered, and then to deenergize the two electromagnets to thereby release the two core box tops, one of them being released on a core box bottom at the first station and the other being released onto the turntable at the third station at a point radially inward of a filled core box.

6. In an apparatus of the class described, a turntable, four core boxes carried by the turntable at intervals, a continuously rotating member, mechanism actuated by the continuously rotating member for intermittently rotating the turntable 90 at a time to four stations with a core box at each station, the first station being a station at which a core box top is placed on a core box bottom, the second a core blowing station, the third a core box top removing station and the fourth a core drawing station, a member above the turntable slidable horizontally back and forth in the vertical plane through the axis of the turntable and stations one and three, a first cylinder and fluid pressure actuated piston for moving said slidable member baok-and-forth, a cylinder carried at each end of said slidable member, a fluid pressure actuated piston in each of the cylinders at the ends of the slidable member and movable in a vertical direction, an electromagnet movable vertically by each vertically movable piston, means for admitting fluid pressure to said first cylinder for actuating the piston therein to move the slidable member back and forth, means for admitting fluid pressure to each of the two cylinders at the ends of the slidable member to move the pistons therein and the two electromagnets in unison in a vertical direction when the slide is at each end'of its path of travel to sequentially raise and lower the two electromagnets, electrical circuits to energize the two electromagnets when they are lowered onto the two core box tops, to maintain the energization of said two electromagnets while the two vertically moving pistons are moving upwardly, while the slide is moving to the other end of its path of travel and while the vertically moving pistons are lowered and then to deenergize the two electromagnets, and means controlled by said continuously rotating member for sequentially operating said slide and parts carried thereby.

7. In an automatic core making machine having a core blowing station,'a core drawing station, a core box top removing station and a core box top replacing station; a turntable; a plurality of core boxes carried by the turntable; a continuously operating member; means actuated by the continuously operating member for intermittently rotating the turntable to said plurality of stations; means at one of said stations for removing a core box top from a filled core box,

- moving it radially inward and placing it on the turntable; means at another station for picking up from the turntable a previously removed core box top, moving it radially outward of the turntable and placing it on the bottom of a core box bottom during the same time interval that a core box top is being removed, moved radially inward and placed on the turntable; means for inverting the bottom of the core box while the turntable is moving from the station at which the top is removed to the core drawing station and for reinverting the same while the turntable is moving from the core drawing station to the station at which the core box top is placed on the bottom part; means controlled by said continuously operating member for automatically operating said means for picking up a core box top, moving it radially outward and placing it on a core box bottom and for simultaneously therewith actuating the means for removing a core box top from a filled core box, moving it radially inward and placing it on the turntable; and means controlled by movement of the turntable for actuating said means for inverting and reinverting the bottom of a core box.

ROBERT R. SNOW.

12 REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 567,884 Brown, Jr. Sept. 15, 1896 1,134,397 McCarte Apr. 6, 1915 1,367,079 Nicholls Feb. 1, 1921 1,512,721 Sutton Oct. 21, 1924 1,526,078 Murphy Feb. 10, 1925 1,570,658 Wickland Jan. 26, 1926 1,575,185 Stenhouse Mar. 2, 1926 1,707,411 Nicholls Apr. 2, 1929 1,739,663 Cicero Dec. 1'7, 1929 1,801,654 Blood Apr. 21, 1931 1,803,117 Lesser et al. Apr. 28, 1931 1,869,112 Nichols July 26, 1932 1,886,096 Hardman et al. Nov. 1, 1932 1,913,808 Kitto June 13, 1933 2,013,277 Luton Sept. 3,1935 2,049,967 Luton Aug. 4, 1936 2,143,026 Nordquist Jan. 10, 1939 2,191,143 I-Iiatt et al. Feb.20, 1940 2,270,509 Common Jan. 20, 1942 2,393,682 I-Iekman Jan. 29, 1946 2,415,997 Eldred Feb. 18, 1947 2,431,320 Fischer Nov. 25, 1947

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