US1474612A - Molding machine - Google Patents

Description

Nov. 20, 1923 1,474,612 A. ALLEN ET AL MOLDING MACHINE Filed June 1917 3 Sheets-Sheet 1 m nkm ewmes WdZZw av 1,474,612 A. ALLEN ET AL Filed June. 30, 1917 3 Sheets-Sheetfi Nov. 20,1923

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Patented Nov. 20, 1923.

ABBOTT LLEN, F DUNELLEN, AND THOMAS MUMEORD,QnoF'PLATNFTELn, NEW 7 JERSEY, ASSIGNORS, BY .MESNEASSIGNMENTfiJTQQROSE s. -MUMEQRD, cor PLAIN- EiELD, NEW JERSEY.

' MO M MACHINE Application filed June 30, 19 17; seriallfl'o. 17 8,' .0 )1.

To aZZ whom it may concern:

Be it known that we ABBOTT ALLEN, of)

Dunellen, county of I Middlesex, and State of New Jersey, and THOMAS J. MUMF'onn,

2d, of 'Plainfield, county of Union, and

I drawing the mold i. e.,'separating the pattern from, the mold.

This general type of machine is old in the molding machine art, but the previously known machines of this class are defective in that damage to the sand mold very frequently occurs in separating or drawing the pa't' tern, for reasons which will appear hereinafter. It is one of the primary objects of our invention to provide an improved jolt roll over pattern draft machine by means .of which the pattern may be drawn without injury to the sand mold. Inthis con nection, our invention contemplates the provision of an improved pattern drawing mechanism; an improved leveling device; and the provision of means whereby. the carrier or roll over mechanism, when moved to inverted position, is supported in such manner that there is no load carried thereby at the time ofthe drawing of the pattern, for purposes which will appear.

' Another object of our invention 'is the provision of improved means for auto mat'ically locking the. mold parts to the roll over mechanism, and iii-the provision of improved means for automatically actuating the pattern mechanism.

The foregoing, together with suchother objects as may hereinafter appear or are incident to our invention, is accomplished by means of the constructionillustrated in preferred 'form'in the accompanying drawings, wherei'n v Figure 1 is a plan view of a jolt roll over-pattern draft machine embodying our invention; Fig. 2 is a side elevation'partly broken away of the machine shown in F 1g- ,ure '1, with certain of the parts shown in cross-section; Fig. 3 is a sectional View ill ustrating'certain details of the invention; Fig. 'is-an enlarged planview and partial section of'oneof the devices for automati cally locking the mold p arts to the roll over mechanism; Figs. 5,6,v and? are sectional details; and F igure 8 isapartial side elevationfand section ,of a locking mechanism used incarrying outourinventi'on Referring now particularly to, Figures 1 and 2, it will beseen that theniachine'com:

prisesa single base 7 upon which'is mounted a joltrammingm'echanism 8 ofanyp're ferred type; a'pair "of supporting' frames orstandards 9 on which ispivotally "carried a roll over mechanism indicatedas a Whole at A; and apattern'drawingand leveling device indicated as a whole at The roll over mechan sm "willflbe first described: This mechan sm comprlses a pair of arms 10 preferably formed integrally with i a sleeve 11 adapted .to be rotatably carried by the shaft 12 supported in theupper ends of the standards 9. The arms 10 eX- tendfalongeach side: of the jolt ramming machine 8 and are braced at their outerjextremities by means of the rod 13.;The' arms are'rotatied about the shaft 12, to assume aninverted position, by means of the piston 14 working in the cylinder 15 swingingly mounted on the base'of the machine between the standards 9, throughgthe medium of the piston rod '16, 'a pair of lever arms 17 and an eccentricshaft .18 which is carried by the arms 17' and towhich is coupled the piston rod 16J2The sleeve '11 is provided witha pair of shoulders, 19 adapted to come ag'ainstfth'e adjustable stops 20 to limit the movement of the roll over mechanism when turned to inverted posi The means for supporting the mold parts .and securing them to the roll over mechanism .will 'now' be; described. The pattern plate 21, i. e;, the board whichcarries the pattern, is end I a v2 downwardly*depending strap" 22 and secured to each of these straps, so as to project downwardly therefrom, area pair-of p'ins23 each of'which passes through a lug or shoulder 24 carried on the arms '10. These lugs 24 also s'lidably support. a locking rodj25, there being one'of such locking-v rods for each arm." Each "locking 'rod is provided with a" pair of collars 125, each of which carries a pin 27 adapted to be passed through the hole 28 formed in each pin 23. The rods 25 are provided with springs 29 adapted to move the rods to the right causing the pins 27- to pass through the openings 28, thus locking the pattern plate 21 to the arms 10. When, however, the parts are in the position indicated in Figure 2, the rods are held in unlocking position by means of a pair of cam members 30 attached to the standard 9 each of which cams is adapted to be engaged by the rollers 31 carried on the end of each rod 25. As the roll over arms are being brought back from inverted position to the position shown in Figure 2, the rollers 31 engage the ends of the cam members 30 and shift the rods 25 tothe left in an amount suflicient I -to withdraw, the pins 27 from the holes 28 in the pins 23.

The operation of the parts thus far describedv will be set forth before passing to the pattern draft mechanism.

Assuming that the parts are in the position indicated in Figure 2, in which posit-ion the rods 25 have been shifted to the left by the cam members 30 an amount sufficient to free the pins 27 from the pins 23, the pattern plate 21 with its pattern rests upon the top of the jolt ramming table and the arms 10 with their associated parts lie slightly below the level of the table. A flask is then placed over the pattern plate 21 and filled with sand, and, the pins 23 being unlocked, the jolt ramming'mechanism can be actuated to impart a jolting reciprocating move ment to the mold parts in order to ram the sand, without impacting in any manner on the roll over arms 10, the pins 23 being slidable in the lu s 2%.

After the mol has been rammed, air is introductecl into the cylinder 15 in any preferred manner, and the piston 14 begins to move downwardly causing the arms 10 to swing upwardly until the lugs 24: come against the straps 22 of the pattern plate 21, and when this occurs, the holes 28 in the pins 23 will come opposite the pins 27. As the upward movement continues, it will be apparent that the arms swing away from the cam members 30, which permits the springs 29 to force the rods 25 to the right, thus causing the pins 27 to enter into the holes 28 in the pins 23, the complete locking movement being accomplished when the rollers 31 leave the cams 30. The mold parts are now securely locked to the roll over arms because the pattern plate is locked to the arms by means of thepins 27 and 23, and the bottom board 32 and flask 33 are clamped to the pattern plate by means of clamps as is well understood in this art.

In order to insure the moving of the rods 25 to locking position, the ends of the cam members 30 are claw-shaped, in such mannor as to engage the rollers 31 on opposite sides when the parts are in the position 1ndicated in Figure 2. By making the ends parts have passed dead-center, after which 7 the weight of the moving parts is sufficient to complete the inverting movement, the balance of the stroke being gradual and easy because the air in the cylinder 15 is slowly exhausted so as vto control this remaining movement or" the parts, and until such time as the shoulders 19 come against the stops 20. The flask 33 is now supported with the bottom board 32 down in the dotted line position indicated above the pattern drawing mechanism B. When the roll over arms are in this inverted position, they sup port the weight of the mold and its parts and this may be in the neighborhood of 3000 pounds or more, which will of course, deflect or bend the arms because it would be im possible to construct the arms 10 so that they would not spring under the weight of the mold parts, without making the arms of a size and weight which would be absolutely prohibitive to economical construction, and economical and effective operation.

It will be apparent that this whip or springing of the roll over arms is an item of important consideration in the drawing of the pattern, for reasons which will be readily understood by those familiar with the art and it is in connection with this that machines of this type have been deficient. The diiliculties encountered in this connection are overcome by our improved pattern drawing mechanism which will now be deits which at each of its four corners is provided 1 with a cylinder 39 in each 01: which is mounted a vertically movable leveling plunger 40. Air is supplied to the main cylinder 3a by a pipe 1-1 from which leads a branch 42 which supplies the four cylinders 39 as will be seen on inspection of Fig- 7 celerated. Thedraw is thus effected at-a valve member 55 adaptedto close the port 37 constituting the means establishing coinmunication between the groove 37 and the space beneath the plunger '36.- w The valve is held in the position as indicated in Figure 7 by means of the spring 56 in whichposition oil can freely circulate." Nhen, how: ever, the stem 52 takes against thestop'o, the port 37 is partly closed, and circulation of the oil is materially restricted, as pre viously indicated, for a purpose to beset forth. 1

It will be apparent that the movement of the plunger as it approaches the upper end of its stroke should be retarded and for this reason the valve 55 is given the'peculiar shape shown-so that whenthe stem 52 takes against the stop 46 and is depressed, the valve, by reason of its shape, gradually restricts the opening 37, thus gradually slowing upthe movement of the" plunger and the parts carried thereby, which prevents in? jury thereto. It will also be noted that by this same arrangement, the initial downward movement of the plunger and its'associat'ed parts is slow, and furthermore, normally acslow rate and without injury to the mold.

It will also be apparent that it is desirable to slow up the movement of the plunger as it approaches the lower extreme or its stroke in order to prevent injury to the parts and to the mold. This is accomplished by providing a small reservoir 59 in the bottom plate 60 of the cylinder 34L and mounting within the reservoir a floating piston-member 61 having a stem 58 which is normally caused to project into the main ."cylinder 34 by means of the spring 62, there'being a restricted port 63-arranged in therparts 61 and 58 so as to permit circulation from the small reservoir 59 into the main cylinder. A plug 57 is screwed into the bottom of the plunger 36, and in operation, when the plunger 36 reachesthe last portion of its stroke, the plug '57 strikes against the stem 58 and forces the stem'and the piston 61 downwardly, the movement, however, be-

ing slow because of the restricted port "63.

through which the oil in the reservoir 59 must beforced into the cylinder 34. The relatively small flow of oil which can:- take place throughthe restricted port slows up the downward movement of the plunger 36 so that no appreciable shock is transmitted to any of the parts; I

It will of course be understood that: when the plunger moves downwardly the stop 44 moves out of contact with the stem of valve 43, andsuch valve closes.

It will be apparent from the "foregoing that the machine operates efiiciently and economically, and is practically fool-proof because of the automatic character of its operation. It will be apparent that no injury the to the molds' can take place! during the drawing and "lowering away-because the initial andthe-closingsoperations of the downward travel are very slow, uniformly accelerated and gradually arrested. *1- f r--:

ilso as set forth, the'relievin'gofthe roll over. mechanism of the eight of the mold parts. absolutely' insures a draw at, right angles with the plane oi s-the pattern, which will eliminate thebreaking and defacement of the mold cavity, which would otherwise take place when the arms wouldzwhip or spring back to normal position, whe-n the arms were relievedrof the weight 01" themold "Again, i151 is. tot madman by theta of =four independent leveling, pistons, with their common operating power of such-a characteras to, allow thefpistons? to move independentlyofone another, the pistons automaticallynaccommodate themselves to any irregularities in the bottom; board such as would be present in afbottom' board which was-warped or otherwise defective." By this arrangement tl'1e,;bottom board is ;;not;only engaged at four separate'points, but is engaged with equal pressure, so that regard loss of inequalities or irregularities; in the bottom board, the bottom board will always be; supported, and thus the flask will always be supported in absolutelythesame position they occupied when clampeclzto the pattern plate in inverted gposition, immediately :previouslto the draw.,-,This also ensures aperl ect draw. Another very important advantage is that-itis unnecessary to make any adjustment forvarying depths of flasks. It is also. immaterial whether the centers of gravity of the mold and the; pattern drawing mechanism coincide; a V ;The-eccentri c l8-isrprovided inorder to inereaseordecrease the; lengthoi' the lever arm 1 in accordance with variations in the load to be: handled by providing the eccen trio with the plurality, of holes 64, the-e0 centric being-.mounted so that anyone of said holes may be shifted-seas to engage the pin- 65, which-obviously will' result .in altering;the,v length} of; the lever arms, and thus altering the leverage-exerted.-

As a meansfor preventing, injury and possible breakage to the levelingdevice, in

the event" ofbreakagei of the air feed line, or other stoppage )f'the,supply 03% fluid pressure ,-when ;.;t'he. mold parts are: being supportedby the-leveling device. we providean automaticlocking devicev 'for holding-the togglesi50',--arms 51; in-locking position. This device is shown on anenlarged scale ia-Fig'ure S. .from an inspectionof which itwilkbe, seen that the piston rods 4:9 oi? the locking-pistons49 which work in the cylinders 48 areprovidedwith an inclined abutment 49 rAss'ociated'with each locking cylinder 48 is a second cylinder'52T I in: which works a piston 53 provided with p rod carrying at its outer eX-" tremity a wedged member 55 which is I adapted to be thrust between the abutment 149 and the head of its respective cylinder 48, thereby holding the toggles in looking the mold has been drawn and removed, the

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I. be'gap arent therefore, that departures canv s'c1 'ibed,"w-ithout departing from the spirit sition. The operation is as follows After the leveling plungers have been moved beneath the plungers 49 and flows from the cylinders 48 through, the ports 56 into the cylinders 52' forcing the'pistons 53, thepiston rods 54; and the wedges 55 to the 'being," assisted by the springs 57'. After levelingplungers are released by introducm pressure into the cylinders &8 above the" pistons 49, and when this occurs the pressure flows through the ports 58 into the cylinders 52' and forces the pistons 53, piston rods 54: and the wedges 55' to the left be the case were the pressure to cease owing causes: I

'Itwill be observedthat our invention is in 'niany respectsfundamental and it will be made from the mechanism shownand deof eurinvention;

We claim:

1; A rollover molding "machine comprisa drawingmechanism over which the car 'rier is adapted to support the mold parts in i'invei' ted" position, means for substantially relieving the roll over carrier of the weight,

:01? the mold parts when in inverted position previous to the draw, and means to prevent the: relieving force from exceedin the a weight of the moldpartst 2. roll over molding machine 'comprisiiig in combination a marginally hinged carflri'eradapted to support mold parts, a draw- 'ii'ig 'i'nechanism over which the mold parts are'supported by the carrierwhen in inverting the mold parts with respect to the drawing: mechanism and substantially relieving a the carrier of the weight of the mold parts previous to the draw.

I marginally hingedcarrier having'aiitomatic clampingmeans for supporting mold parts, fa drawing mechanism over which the mold oi/parts arezsupported by thecarri'er whenin 'inverted' position, and a leveling "device' asinto engagement with the bottom board, pressure is admitted into the cylinders 48' right into locking position, this movement against the pressure of the springs 57, thus fpermitting thetoggles 50 to be moved to" unlocking position 'By this arrangement it will -'be "readily "seen that the leveling' plungerseannot 'fall accidentally, as' would to the breakagein the air feed line or other ing in combination a marginally hinged roll over carrier adapted to support mold parts,

"edfpositi'on, and means automatically level- "'3. A roll over machine comprising a' supporting mold parts during the draw, said leveling device also se'rvingfto maintain the plane of the carrier at right anglestothe anism.,- i y y 4:. A molding "machine comprising a marginally hinged oarrier, a vertically movable drawing mechanism over which the mold partsare supported in inverted posiplane of movement of the drawing mech tion by the carrier, 'and'means associated proximating the load pressure thereofwhereby the carrier is substantially relieved of the weightof the mold parts preparatory to the draw and means to prevent the re lieving force from exceeding the weight of the mold parts. f 1

6. A molding machine comprising a vertically movable d awing: mechanism, a carrier adapted to support the mold parts in operative relation with respect tofthe drawingm'echanism, a leveling device associated with the drawing mechanism comprising a plurality of supporting members normally p out of engagement with the flask, means for moving said supporting members independently into engagement "with moldfparts,

and means for locking said supporting membersf y,

7. A molding machine comprisinga vex tically movable, drawing" mechanism, a carrier adapted vtosup port the mold parts in operative relation with respect to the draw- .ing mechanism, a leveling devicef associated with the. drawing mechanism comprising four cylinders in each of whichflis provided a plunger, means forintrodiicing airlinto said cylinders to advance the ,pl ingers into engagement with'mold parts, and meansfor locking said plugngers. j v 8. A noldingmachine comprising a verti'cally movable drawing mechanismg'a marsociated with the drawingmechanism for ginally hinged'carrieradapted to support mold. parts 'inoperativerelation withrespect to said drawing mechanis'imahead carried on said drawing mechanism, said head being provided with a plurality of plungers,means forladvancing said plungers independently into'engagement with mold parts to support the same,*and means for locking the plun gers.,

9.-"A "moldingma'chinefcomprising in com- -bii at'idn "a 'patt'ernfdrawi ig m' "echa nism, a

- rollover carrier-mechanism; adaptedto sup; porti mold' parts in 'operativei'elati'bn. with respect to said drawing mechanism, and a leveling device associated with said drawing mechanism comprising more than two sup porting members, and a common means for supplying fluid pressure for advancing said supporting members independently into engagement with mold parts to support the same, said operating means being adapted to permit the supporting members to independently accommodate themselves to irregularities in mold parts.

10. In a molding machine the combination of a carrier adapted to support mold parts,

a vertically movable drawing mechanism, means for advancing said drawing mechanism toward the mold parts, an automatic leveling device associated with thedrawing mechanism, automatically operated when the drawing mechanism has moved a predetermined distance toward the mold parts.

11. A roll over drawing molding machine comprising in combination a drawing mechanism, a carrier adapted to support mold parts in operative relation thereto, a normally inoperative leveling device associated with the drawing mechanism, and means rendering said leveling device operative, said means being actuated by the move ment of the drawing mechanism.

12. A molding machine comprising in combination a drawing mechanism, a carrier adaptedto support mold parts in operative relation thereto, a leveling device associated with the drawing mechanism and adapted to be advanced into engagement with mold parts, means for operating the leveling device, and means carried by the drawing mechanism for automatically, setting in operation said last mentioned means.

13. A molding machine comprising in combination a vertically movable drawing mechanism, a carrier adapted to support mold parts in operative relation thereto, a

leveling device associated with the drawingmechanism comprising a plurality of cylin ders each having a plunger adapted to be advanced into engagement with mold parts,

a valve for admitting fluid. pressure into said cylinders, and automatic means operable by the movement of the drawing mechanism for opening said valve.

14. A molding machine comprising in combination a carrier adapted to supportmold parts, a drawing mechanism, a stop adapted to hold the carrier in operative position with respect to the drawing mechanism and means associated with the drawing -mechanism for taking the load of the mold parts when in operative position without altering the position of the carrier determined by the stop. a

15. The combination in a molding machine, a vertically movable drawing mechanism, a marginally hinged carrier adapted to support mold parts'in inverted position 'tive relation thereto,

parts associated with the drawing mechanism and adapted to substantially relieve the carrier of the weight of the mold parts previous to the draw, and means to lock said power means in operativeposition.

17. In a molding machine the combination of a vertically movable drawing mechanism, a marginally hinged carrier adapted to support mold parts in inverted position above the drawing mechanism, power means associated withv the drawing mechanism adapted to substantially support the weight of the mold parts on the carrier, and means for varying the power exerted by said power means. a

18. A molding machine comprising in combination a drawing mechanism, a carrier adapted to support mold parts in operaa fluid operated plunger adapted to engage mold parts to substantially relieve the carrier of the weight of such parts, and means for maintaining a predetermined pressure on said plunger. A r

19. A molding machine comprising in combination a drawing mechanism, a carrier adapted to support mold parts in operative relation thereto, and a combined leveling and supporting device associated with the drawing mechanism comprising aplurality of cylinders, a plunger in each cylin der adapted to be advanced into engagement with mold parts, a common source of fluid supply for said cylinders, and a pressure maintaining valve for said source of s wn v- 20. molding machine comprising in combination a carrier adapted to support mold parts, a drawing mechanism comprising a main cylinder, a 'plung'er zin said cylinder movable a predetermined distance toward the mold parts,-and a plurality of mold parts, a drawing mechanism comprising a main cylinder, a plunger in said cylin der movable a, predetermined distance toward the mold parts, a plurality of secondary cylinders, each provided with a plunger, said 'plungers being movableinto engagement with the mold parts, the main plunger and the secondary plungers coming into operation successively, and a common means for operating all of said plungers.

22. Ina molding machine, a carrier, a drawing mechanism, means for operating the same, and "means for cutting down the speed of the drawing mechanism at the limits of its stroke.

'23. In a molding machine a carrier, a pattern drawing mechanism comprising a cylinder and a plunger, one of which is provided with an oil reservoir, a passage for permitting flow of, oil from the reservoir to the space beneath the plunger, means for introducing fluid pressure above the oil, and automatic means controlling the passageway, and adapted to restrict the flow through said passage at the limit of movement.

24. In a molding machine, a carrier, a pattern drawing mechanism comprising a cylinder and a plunger, one of which is provided with an oil reservoir, a passageway for conducting oil from the reservoir to the space beneath the plunger, means for introducing fluid pressure above the oil, and valve mechanism controlling said passage.- way adapted to close said passageway at the limit of movement.

a plunger, one of which is provided with an oil reservoir, a passageway for conducting oil to the space beneath the plunger, means for introducing fluid pressure above the oil, and means for arresting theupward movement of the plunger comprising an automatic valve adapted to close said passageway.

26. In a molding machine, a carrier, a drawing mechanism comprising a cylinder, a plunger. one of which is provided with an oil reservoir, a passageway for conducting oil to lower face of the plunger, means for introducing fluid pressure above the oil, and means for cushioning the plunger at the limit of movement.

27. A molding machine comprising in combination a roll over carrier adapted to support mold parts in inverted position with reference to a drawing mechanism, a leveling device comprising a plurality of leveling elements movable into engagement with the mold parts, a pressure actuated locking means for the leveling elements, and positive locking means for locking said first locking means.

In testimony whereof we have hereunto signed our names.

ABBOTT ALLEN. THOMAS J. MUMFORD, 2D.

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