US2624084A - Mold and coremaking machine - Google Patents

Description

Jan. 6, 1953 J. R. ROW

MOLD AND COREMAKING MACHINE Filed Oct. 2l 1948 6 Sheets-Sheet l @www His Attorney.

Jan. 6, 1953 J. R. Row 2,624,084

MOLD AND COREMAKING MACHINE 6 Sheets-Sheet `12 Filed OGt. 21 1948 nventor; John R. Row,

WMO/f His Attorneg Jan. 6, 1953 V J. R. Row

MOLD AND COREMAKING MACHINE 6 Sheets-Sheet 5 Filed OCT'. 2,1 1948 MRS ...lill

' Inventor: ,John R. Row,

His Attofneg.

Jan. 6, 1953 J. R. Row 2,624,084

MOLD AND COREMAKING MACHINE Filed oct. 21, 194e e sheets-sheet 4 Emmy i n i rnmwr..

% inventor: 'a .John R. Row, b5

His Attorneg.

.Ia-m. 6, 1953 J. R. Row 2,624,084

MOLD AND COREMAKING MACHINE Filed Oct. 21, 1948 6 Sheets-Sheet 5 Inventor: John R. ROW,

25 l E zo Z5@ v@ mw/ p AJM/t@ E His Attorrleg.

Jan. 6, 1953 J. R. Row 2,624,084

MOLD AND COREMAKING MACHINE Filed OCT.. 2l 1948 6 Sheets-Sheet 6 His Attorneg.

afpatternl'and then the complete mold is ready .secured to-,a oor.or;other,building structure22 vfor pouring. asfby aplurality. of.bolts"2la. .If desired, the

The ypresent invention greatly decreases Y, the 25 .entire machinemay be spring mounted by inserttime and expenseof -making-acomplete, mold :in r ing spring members 2lb between the flanged p0rft'nat' thev oorexaswellxas .thezmoldxmay be..made .tions 2 l. and ,themain frame 20. The machine :infhalvesof greensandftmechanicallyfbooked ..has two rollover tables identied. as a left-hand (irre.ftherhalves:mechanically'pressed:together ...ta-ble. 23 andaright-handtableZd. VThese tables 1to1 form:..an integrali4 unit) and then, 'Whilez still each havea Yvertically movable ace,. or .'platen,` 25 :.'in'thez'machine of theqinvention;thexcorermay 30 land 26,-respectively. rbe inserted into anouter moldwhich is then'ready The. machine is= provided with four rollover I for pouring. pressure fluid motorsinthe form of cylinders 21, It. is anobject ofithe present inventiontopro- 28, 29.and 30 (Fig. 2) ,ieach provided withv apiston videa mold and core makingfmachine having two 3! .(Fig. 3 -.and.a piston rod) 32. connected. .to a

Patented Jan. 6, 1953 u Y v111J 1\u"r1:D STATES :RATENT Iorifice MOLD .AND COREMAKINGHA MACHINE l "John R.'R\ow, Elmira,r N2 Y. :Application Qctober 21, 1948, Serial' No. 55,',661 10 Claims. (Cl. 'Z2-410) 1 2 '.My. invention relates to .mold andcore .making "FigB isa cut-away view of the4 samefmachine .machines anda-.more particularly Ito;.a .machine "t'akenfon the line"3-`3 of Fig. 2L and showingopdesigned to perform a numberof related..but 'eratingcylinderswhich are located'along "the .sequential .functionsfor example..1st packing two transverseaxes'of'the machineyFigfl is sand in two flasks :by jarring or- .jolting jto form 5 'acrosssectional'View' ofwa jolt-squeeze-pattern Vmold or core halves, then turning for. rolling over Aidraw cylinder-of the machineof Figs. 1, 2'and `.each half of 4.the mold.,or corek tothe vertical "3;,Fig. 5l is'a likey viewofa'portion of the same ,positionthen booking (i..e.,v bringing the .halves cylinderybut lshowing anotherstep in theoperatogether), then rollingback thevwhole assembly ition of. its -inner or valvng piston'64; Fig. l64S `vv-to one side ofthe machine, where one. flaskis 10 alike' vi'ew'ofv a portion of thev same cylinder but removed tor. pattern drawn) ,.then rolling.over showing stillanother step. in its operation; Figs. :stm the other .sideto remove r.the .othenask or 7`13 are diagrammatic" representations of-steps pattern, in ,the operation of .the machine of Figs. 1,v 2 and'3; "Heretofore, relatively large sand cores (forfex- 15 and* lig.A 14 is a schematicrepresentationof jthe amplacores for molds for makingintegralhorsepiping and Valves (of the machine shownin the @power .induction motorA` stator frames) vbecause .otherguresy of theirxsize have been made in. halves,.drawn "Referring now. to Fig.' 1 showinga front eleva- :from their boxes,.and thenthe .halves fitted/and tion; Fig.'2 showing a top.. plan view,.and"Fig.. 3 cemented together. Thereafter .the completed `showing a sectional elevation; I have 'shown a V core isinserted'in-an outer moldA (which hasbeen 20 ...mold .and core .making machine having a ,main -f separately fashioned. of sandin a flash and about base 2Q withrbottom hanged portions 2| preferably rollover tables independently` operable buthinged 35 cranks. Each crank-33vis .formed integralwith zorV rotating f. in opposed relation .on a common fa bushingfsection 34 (see Fig. 2) mounted on a center to assure perfect alignment thereof. central: shaft :35. YTheA bushing Asectioned/i `are Itis a further object of thev present invention to provided Yl`.with .endplatesff each of which. is provide a mold and core making machine having .bolted to an adjacent face plate. 3l formedv inarranged integral with each table thereof, a single 40 :tegral: withzfan additional bushing section-.Which vcylinder housing containingh pistons adapted to is 'an integral partof .fa carrier arm-38. Two "-cperate :for jolt; book; squeezeV and-pattern draw carrier arms are attached' to. theleft-handv table operations. 2E and two carrier arms are attached to the right- It is a stilll furtherobject of the-present invenf handtable 2e so that the -pistons in the outercyltion to-providea valve `forarnoldand core mak- 45 i inders'2l. and-.30 loperate right table -24- and the *ing machine `which facilitates the use f of vjolt j. pistons in theinner cylinders 28 and 29'operate pressure for an additional, or emergency, `lleft. table23. The'mechanism'is adapted to have squeeze pressure. -f the. tables 'operateqindependently' of` each other Other obiectsand advantages'willbecomeape and the pistons and cylinders for fthe right table .parentandmy.invention will be better-.understood .5o may fbe considered as `one-fluid -pressureimotor ifrom aconsideration of the following description Aland thosefassociated with the` left tableas antakenin connection'with the accompanying drawi other.

ings inwhich Fig.r l is a front elevationoal View `France Y2tlof the machine is provided .at its oie a complete mold .and core .making machine; center with acutfoutportionhaving a plurality Fig. 2 is a top plan View of the machineof.Fig..1;v ..55. 0f cross bars 39 (Figs. 2 andS) which may be made integral with the frame itself. As shown in Fig. 3 each rollover cylinder 27-35 is pivotally connected to the respective cross bar 39 by mounting brackets All! and pins 4! to allow for arc-like movement of each cylinder and piston with travel of the associated crank arm 33. Each cylinder (2l-3G) is of the closed head type, operation of the associated piston being caused by the introduction of operating fluid (such as air) at the top of each cylinder through a port 42. Fluid thus admitted will serve as a counter balance holding the piston in position until the uid is released. At the other side of the piston an exhaust to atmosphere is provided through a port 43.

Associated with rollover table 23 is a joltsqueeze-book and pattern draw pressure uid motor in the form of a cylinder 44 and associated with rollover table 24 is a like cylinder 45. Each of these cylinders is mounted integral with the associated table (see Fig. 3) and has pistons L operating the associated platen (2'5 or 26) and there are also, for each platen, two guide pistons co-operating with guide cylinders 4S.

The pistons of each jolt-squeeze-pattern draw cylinder ist and 45 may be more clearly understood by reference to Fig. 4 which is a crosssectional front elevation of one of the identical cylinders (44 being selected) together with the associated platen and pistons. The cylinder 44 is secured by bolts 4l in a central cylindrical opening formed in its associated table 23. The cylinder also has a radially spaced concentric inner housing t8 with a principal sleeve piston 49 interposed between the inner and outer nousings. Piston 4S has a lower danged portion 50 provided with piston rings l, and has an upper flanged portion 52 secured to the movable face 25 by bolts 53. At its lower end the outer cylinder 44 is provided with a tapered threaded port 54 with a conduit 55 secured therein so that when air is introduced thereby, the piston will lift and in turn lift the movable face 25. For convenience, piston d3 will be hereinafter referred to as the squeeze piston and it will be understood that operating iluid is introduced through conduit 55 for the squeeze, or booking operations. A guide for piston 19, as well as a seal for its enclosure, is provided at the top of the outer cylinder by an annular guide member 56 having packing 5'! held in place by an annular top ring '58 fastened to the guide 56 by a plurality of screws 59. Annular guide member 56 may comprise two split halves (for convenience in assembling) with the two halves bolted together as by bolts 56a and also bolted to the table and to the outer cylinder by bolts 4l. The upper end of the inner cylinder A8 is provided with packing rings 5t! and a flange portion El to which is secured, by bolts 52, the flanged end of a cylindrical sleeve member 63. This stationary sleeve 63 encloses a cylindrical valve piston member 54. At its upper end piston E54 is held by a collar 65 bolted to platen 25. The piston 64 is provided with ports 66 allowing the escape of operating fluid from the center of the piston to the chamber 6l (dened, in part, by the upper face of sleeve 63, the lower face of platen E5, and the inner wall of piston :39) thereby raising the associated platen 25.

At its lower end, sleeve 5S is provided with a flanged portion to which is secured a block 58 having formed therein an upper transverse cylindrical bore and a lower transverse cylindrical bore l0. Secured to block 5t at each end thereof are end plates 'H which form cylinder heads for y' vided in lower bore lil.

bores GB, 10. The upper bore t9 is provided with a slidably arranged dumbbell-shaped valve member l2 having two spaced disks '13, Ml forming a circumferential groove 75 therebetween. The

1 lower bore 'EQ is provided with a slidably arranged valve member 'ihaving four spaced disks 7l, 18, 19, 8@ formed integral therewith and forming circumferential grooves 8|, 82, S3 respectively.

Pressure operating fluid for jolt action of platen 25 is supplied to lower bore i0 through a conduit 84 secured in a port 85 formed in the bottom of block 68. As may be seen in Fig. 4, when valves i2 and 'I6 are in their extreme right-hand positions, the operating fluid admitted to lower bore 'Ill is communicated through a connecting port 36 to upper bore thence through a port 81 provided in the top of block 68 to establish communication between upper bore B3 and the space within sleeve 63 and within piston de. As previously described, the operating fluid entering the center of piston 6d. will escape through the upper ports 65 to the chamber 'i to lift the platen 25 for jolting action.

The jolting action is an automatically interrupted or reciprocating action, and to provide this feature the inner piston 6d is provided with a circumferential groove 8S formed in its outer periphery and intermediately spaced from its ends. A plurality of ports are provided to cooperate with this groove and thus ports 89 and 9D are provided in sleeve S3 to register with groove 3S when the platen 25 and piston 54 are in lowered position. Port 9 communicates through conduit members Si! and 52 with a port 93 pro- Port S5 communicates through a conduit 34 to a port 95 in the wall of the upper valve bore (5S and at the left of the extreme left-hand travel of valve 'i2 therein. By way of summary it may be stated that a circuit can be traced from supply conduit 84 and, whenever valve piston T56 is biased to the right, then through port 93 and conduit 92 to conduit 9i and port 8S so that whenever the platen is lowered and groove is in line with ports 89 and 90, the circuit is completed through conduit Se to port 95 at the left end of the bore provided for valve piston l2. Thus when platen 25 is in the lowered position, air for jolting from conduit 84 reaches port S5 to keep valve 72 to the right to allow air from conduit 84 to travel upward to ports B to raise the valve piston 6d and the platen 25. This raising breaks the communication from port 89 to port Se around the groove 88 of the valve piston. At a higher position groove 8B forms communication between ports 96 and 9i provided in sleeve member E3. Port 8S communicates through conduits Si and 52 with port 93 in the lower valve bore. Port 97 communicates through a conduit 9S with a port '39 provided at the right-hand end of upper bore 59. When the platen and piston have traveled upward far enough for groove Bt to register with ports and el, as shown in Fig. 5, air from conduit d enters port S3 to travel from port 96 to port 9i' to port Se and cause the piston member 'l2 to travel to the left. As shown in Fig. 5, when valve 'i2 moves to its left-hand position its head f4 covers port 5t to cut olf communication between bore 'it and bore t the same time its head 'i3 uncovers a second connecting port it@ provided between the two bores so that operating fluid is permitted to exhaust around groove 82 of the lower valve member and through an exhaust port lili to atmosphere, allowing valve half of the core I (Fig. 10) with the drag flask supported by pins |2|, and then pressure is applied to the cope J. S. P. D. cylinder 44 which slightly raises the platen 25 and in so doing inserts the drag-core-half all the way into the drag nask. The front and back pins |21 at the left side of the machine are then lowered and the right-hand table 24 with the empty drag core box |05 is rolled to the left side and locked.

Pressure is applied (through proper conduits including squeeze conduit 55 of Fig. 4) to the cylinders 44 and 45 in order to clamp the drag iiask rmly between the two core boxes, as shown in Fig. 11, so that when rolling over there can be no slippage between the drag flask |26 and the cope core box |84. If the molds or asks are extremely heavy it may be necessary to use additional pressure. Therefore, an emergency squeeze feature is provided. This feature may be understood by reference to Fig. 6 showing a port |28 provided in end plate 7| at the righthand end of lower valve bore 10. A conduit |29 is adapted to feed operating fluid into the bore through this port for emergency squeeze action. Pressure of the operating uid for-ces valve member 'I6 to the left covering exhaust port ||l| so that platen 25 and valve piston 64 are forced up (and held up). To achieve this end it is essential that top valve member '|2 be held to the right (so that it uncovers ports 86 and 81) and Y' to assure this a bore |30 is provided in lower valve member I6 to form communication'from circumferential groove S3 to circumferential groove 8| of the lower valve. A port |3| is provided to establish communication between the two bores 69, it at their left-hand ends so that when, for emergency squeeze, lower valve 16 is forced to the left and its groove 8| registers with this port, operating iiuid from conduit 84 will be introduced into the left end of the upper bore to hold upper valve |2 to the right as desired. Thus with valve members 72 and 'I6 maintained in these positions (i. e. 12 to the right and T6 to the left), iiuid from conduit 84 (normally employed in the jolting operation described hereinbefore) is communicated through port 86 to upper bore 69, thence around groove 'l5 of member |2 and through port B1 to the interior of piston 64 as indicated by the arrows of Fig. 6. From the interior of piston 64, the fluid is communicated through ports 66 (Fig. 4) to chamber 61 whereby additional squeeze pressure is exerted on the underside of platen 25 to supplement the squeeze pressure exerted on the underside of piston flange 50 by fluid admitted through conduit 55 and port 54.

Y When pressure is introduced by conduit |29 to keep valve member '16 to the left and valve member 13 to the right as described, valve member 72 will prohibit any jolting action for even when platen 25 moves to a position such that the groove 88 of piston 64 registers with ports 96 and S1, valve member 12 remains in its extreme righthand position (i. e. with inlet port 86 open and exhaust port |05 closed) because the uid pressure transmitted through conduit 98 and port 99 (Fig. 5) to the right-hand side of valve member '|2 is substantially equal to the pressure on the left-hand side, transmitted through bore |30 and port |3| (Fig. 6). Hence the additional squeeze pressure supplied through conduit 84 and exerted on platen 25 is continuous and uninterrupted for all positions of piston 64.

Returning now to consideration of Fig. 11,

with the assembly of cope core box and drag flask held together by the pressure of empty drag core box |55 against the solid bottom of the drag flask (either with or without emergency squeeze, as necessary), the entire assembly is then rolled over to the right-hand position shown dotted in the right half of Fig. 11. The cope core boX is then vibrated by introducing operating iluid to the pneumatic vibrator ||4 and, at the same time, the pattern is drawn by lowering the core I5 out of the cope core box |64 or in effect, raising the cope core box as shown in Fig. 12. This raising of the core box for pattern draw is accomplished by reverse action of the squeeze piston (49), i. e. by introducing pressure fluid through conduit |32 (Fig. 4).

With the entire assembly in the position shown in Fig. 12, the tables are then unlocked and the table 23 (with the now empty cope core box |64) rolled over to its normal position at the left-hand side as shown in Fig. 13. A cope iiask |27 containing the outer cope mold is then brought up to the machine and centered over the cope half of the core, so that when pressure is applied to the drag squeeze piston (similar to 45 of Fig. 4) the cope half of the core is fully inserted into the cope mold. The mold is now complete as shown in Fig. 13 and, after clamping ilasks |26 and |21 together, the mold may be taken away for pouring.

In Fig. 14 I have shown a schematic arrangement of piping required for operation of the machine. It will be understood that where a conduit connects two relatively movable pieces of appartus, exible conduit (such as rubber hose) may be found desirable even though it is not indicated as such on Fig. 14. Operating duid, such as air, is introduced by a pipe Mii to a header |50 which, in turn, feeds a plurality of operating valves |5|-|59, each of which comprises a housing for a rotatable dumbbell-shaped valve member |60.

A conduit |25 (Fig. l and Fig. i4) connects the bottom of each left-hand pin lift cylinder ||6 with one side of valve |5|; operating fluid is introduced at the bottom of the valve and an exhaust port |6| is provided at the top of the valve, so that when the valve is turned approximately 45 degrees counterclockwise from the position shown in Fig. 14 the left-hand pins |2| are raised, and when the valve i 5i is then turned approximately 45 degrees clockwise back to the position shown in Fig. 14 the same pins are lowered. From the right side of valve |55 connection is made through conduit B4 to the bottom of the jolt valve block 63 for the cope platen 25 (see Fig. 4). Thus, this same valve i5i is used both for pin lift (by turning in one direction) and for jolting (by turning it in the other direction).

'Ihe emergency squeeze conduit 25:2 (for lefthand table 23) and the squeeze conduit 55 (for the same table) are connected together and to a conduit |3| connected to the left side of operating valve |52. It will be understood, from a study of Figs. 4 6, that when valve i5! of Fig. 14 is operated for jolt action without operation of valve |52, the associated platen will jolt, that when valve |52 is operated without operation of valve |5| the platen 'will squeeze (the only effective pressure being that supplied through conduit 55) but that when the jolt action of valve |5| and the squeeze action of valve |52 are both called for, the emergency squeeze feature (through conduit |25) is provided.

A conduit |32 is provided from the right side of valve member |52 to the top of the bore procylinder for each rollover table either core box can be rolled to either side of center desired to effectuate the pattern draw for first one core box, then the other.

In the whole process of making and booking cores, and adaptaing flasks in outer molds thereto, it is unnecessary, with the machine of the invention, to use any clamping device (other than the rollover table lock lati-|01) In the whole process of m-aking molds and cores, with the machine of the invention, there is no need to clamp or handle core boxes. Many operations are thus eliminated.

One function of the pin lift cylinders is to enable the machine to produce a jolt strip mold as well as a jolt rollover mold. When making jolt strip molds, two diierent patterns may be run on the opposite ends of the machine at theY same time since all operating valves are accessible to a single operator at one standing position. When the machine is used as a jolt rollover mold making machine, the one table carries the pattern and flask, sand is put in and then jolted, the other table is then used for clamping the job to roll over, the two tables are locked and the one table is then raised to draw the pattern off the other table which is then carrying the load of flask and molded sand. At this time, both pattern draw devices can be used to give a very great length of draw within the limit of the distance between the two tables when locked together. Thus when making molds the machine of the invention may be used for a mechanical pattern draw and again the use of separate clamps are unnecessary, and thus it is seen then that the features of double rollover tables and combining the joltsqueeze-pattern-draw functions in each of the two single outer cylinder housings are applicable to making molds just as they are to making cores.

The function of the jolt control lockout valve is to enable the operator to use the full area of the jolt piston in the emergency squeeze operation, in addition to the available squeeze piston area. Whenever the air is turned on for operation of the squeeze piston, a branch connection to the jolt lockout Valve moves this valve ovei` to out off the jolt exhaust and by then turning air into the jolt valve, lthe jolt mechanism pfrovides an auxiliary or emergency squeeze. When the air is then exhausted at the close of the squeeze operation, the lockout valve returns to normal position.

The machine is also flexible in that operating Ithe pattern draw With the jolt operation will give a heavier jolt for large work. In addition, inasmuch as loaded tables are never rolled over all the way 'except when the two tables are locked together (since otherwise the molding sand would fall out), dual power is always available for the rollover operation because all four rollover cylinders are in operation.

Another advantage of the machine of the invention is absence of vibration when jolting molds or cores. This feature is provided by the fact that both rollover tables are always associated with the same main and heavy base and are never brought to rest directly on the iloor itself.

There is thus provided a combined power jolt, squeeze, book and pattern draw double table rollover mold and core making machine and a device of the character described capable of meeting the objects hereinabove set forth. The machine is useful whenever duplicate castings in large number are required and especially where large molds, which cannot be handled by hand, are involved. By using the machine in such applications the cost of making castings has been cut in half.

While I have illustrated and described a particular embodiment of my invention, modifications thereof will occur to those skilled in the art. I desire it to be understood, therefore, that my invention is not to be limited to the particular arrangements disclosed, and I intend in the appended claims to cover all modifications which do not depart from the spirit and scope of my invention.

What I claim as new and desire vto secure by Letters Patent of the United States is:

1. A mold and core making machine comprising a transversed shaft, two rollover tables rotatable about said shaft in opposed relation, each of said tables having a fluid pressure motor connected for squeeze operation at the respective table, and each having a fluid pressure motor connected for jolt operation at the respective table, said squeeze fluid pressure motor including a piston which acts as a cylinder housing for said jolt fluid pressure motor.

2. A molding machine comprising a central portion forming a support and dual end portions each having a base, two rollover tables hinged in opposed relation on said central portion and each arranged to co-me to rest on a different one of said end portion bases, a pressure fluid actuated jolting platen connected with each rollover table, a cylinder attached to each of said rollover tables and having a piston supporting said jolting platen, guide pistons connected to each platen and operating in cylinders arranged to be stationary with respect to the respective rollover table, means for rolling each table together with the associated platen to either side of the machine, and means for locking said tables in substantially parallel relation.

3. A mold and core making machine having a central base forming a support and dual end bases forming supports for tables pivotally secured to said central base support, a pressure fluid actuated jolting platen connected with each of said tables and arranged to support a mold. means for locking said tables together, means Afor pivoting said tables around said central base support, a housing connected with each of said tables and containing pistons arranged to jolt, book, squeeze and pattern draw said molds.

4. A mold and core making machine comprising a main frame having a central portion and two end portions, a central shaft mounted transversely in said frame central portion, a plurality of rollover cylinders pivotally connected to said frame central portion and each having a piston therein cooperating with a piston rod attached to a crank arm rotatable around said central shaft, an end plate rotatable with each of said crank arms, a face plate attached to each of said end plates and arranged to be rotatable around said central shaft, a pair of rollover tables each arranged to be brought to rest on one of said frame end portions, and a plurality of carrier arms each connected to be rotatable with a different one of said end plates, half of said carrier arms being attached to one of said rollover tables and the other half of said carrier arms being attached to the other of said rollover tables'.

5. A mold and core making machine provided with an even number of pressure fluid actuated rollover cylinders each having a piston and pis- 13 ton rod connected to a crank formed integral with a bushing section mounted on a central shaft of the machine, said bushing sections being provided with end plates, face plates bolted to said end plates and secured to carrier arms, a left-hand table for said machine and a righthand table for said machine, the carrier arms associated with half of said rollover cylinders being arranged to eiect rotatable movement of one of said tables, the carrier arms associated with the other of said rollover cylinders being arranged to eiect rotatable movement of the other of said tables, conduit and pressure fluid control valve means for controlling operation of said rollover cylinders, a movable platen arranged to move toward and away from each of said tables, 9, cylinder mounted integral with each of said tables and containing at least one pressure iluid actuated piston arranged to effect jolt operation of the associated platen, each of said cylinders containing a pressure iiuid actuated piston arranged to eifect squeeze operation of said platen, conduit and valve means for controlling said jolt and squeeze operations, valve means arranged to lock out said jolt operation means to facilitate the use of the full area of said jolt piston as an emergency squeeze, pin lifting mechanism at each end of said machine and arranged to cooperate with the respective tables in their lowered positions, a pressure fluid operated locking means movable with one of said tables, and a stationary clamp arranged to cooperate with said locking means and movable with the other of said tables.

6. A mold and core making machine provided with two rollover tables mounted in opposed relation for rotation about a common axis, means including a plurality of rollover cylinders having piston means connected to each of said tables for rollover operation of said table, a movable platen arranged for movement to and away from each of said tables, a cylinder mounted integral with each of said tables and containing piston means arranged to cause movement of said platen with respect to said table, means located within said cylinder for causing squeeze operation of said piston means and said platen, means within said cylinder for causing draw operation of said piston means and said platen, means within said cylinder for causing reciprocating jolt operation of said platen, and means within said cylinder whereby the combination of jolt and squeeze means will eifectuate a continuous emergency squeeze.

7. A mold and core making machine comprising a frame central portion and dual frame end portions, a pair of rollover tables each adapted to come to rest on one of said frame end portions, a plurality of pressure fluid motors supported by said frame central portion and adapted to actuate said tables for rollover operation substantially independently of each other, each of said rollover tables having connected therewih a pressure fluid motor actuated platen, said motor including a piston supporting said associated platen, and means including guide cylinders and pistons for preventing slippage of each of said platens with respect to the associated rollover table.

8. A mold and core making machine having a main base, a transversely extending central shaft journaled in said base, two rollover tables each mounted for rotation about said shaft in opposed relation to each other, each of said tables having a platen separately movable toward and away from the respective table, each of said tables having separate means each including a, fluid pressure motor adapted to rockover the respective table about said shaft, each of said tables having a separate fluid pressure motor comprising a, cylinder attached to said table and having a piston connected to move said platen with respect to said table in one direction for squeeze and book operation and in the opposite direction for pattern draw, said cylinder for each ofsaid tables comprising concentric outer and inner walls with said piston positioned therebetween, a stationary sleeve located within the innermost of said concentric walls, and parts arranged to cooperate with said sleeve to form valve means operable from positioning of said sleeve and platen for intermittently introducing fluid pressure to a chamber bounded by said platen, said piston, and said inner wall to form a, second fluid pressure motor for providing a reciprocating jolt action of said platen, and means for rendering said valve means inoperative thereby to provide a continuous pressure to said last mentioned chamber for emergency squeeze action.

9. A molding machine comprising a transverse shaft, two rollover tables hinged on said transverse shaft in opposed relation to each other, each of said tables having rotatable therewith and formed integral therewith a cylinder housing located :on the -generally under side of the associated table, each of said housings having a piston therein, each of said tables having a relatively movable platen located on the generally upper side thereof and connected to said piston, fluid pressure supply means, and connections for conducting fluid pressure from said supply means to either of said cylinder housings and at the ends thereof between said pistons and said t-ables for effecting pattern draw operation.

10. A molding machine comprising a transverse shaft, two rollover tables hinged on said transverse shaft in opposed relation t-o each other, each of said tables having associated therewith and arranged to be rotatable therewith rst cooperating fluid pressure piston and cylinder mechanisms for effecting jolt operation at the respective table, and each of said tables having associated therewith and arranged to be rotatable therewith second cooperating uid pressure pis- -ton and cylinder mechanisms, means for causing either of said second piston mechanisms to be operated in a first direction for squeeze operation, and means for causing either of said second piston mechanisms to be operated in a second direction for pattern draw operation.

JOHN R. ROW.

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

UNITED STATES PATENTS Number Name Date 1,157,403 Lewis Oct. 19, 1915 1,476,069 Gilmore Dec. 23, 1923 1,512,721 Sutton Oct. 21, 1924 1,571,442 Wahlgren Feb. 2, 1926 1,679,982 Lenz Aug. 7, 1928 1,801,978 Prince Apr. 21, 1931 1,910,354 Nicholls May 23, 1933 1,931,185 Firestone Oct. 17, 1933 1,931,902 :Oyster Oct. 24, 1933 1,937,910 Oyster Dec. 5, 1933 2,376,203 Stemmler May 15, 1945 2,439,515 Hodgson Apr. 13, 1948 2,459,456 Rockwell Jan. 18, 1949 2,460,196 Simpson Jan. 25, 1949

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