US1367078A - Molding-machine - Google Patents

Description

W. H. NICHOLL'S.

MOLDING MACHINE.-

'APPLICATloN man JUNE 25. 1919.

1,367,078, `Patented Feb. 1,1921.

2 SHEETS-SHEET 1.`

nin

W. H. NICHOL'LS.

MOLDING MACHINE.

APPLICATION FILED IuNE 25.1919.

1,367,078. Patented Feb. 1, 1921.

2 SHEE'BIMSHEET 2.

uNrrEo sraras PATENT OFFICE.

WILLIAM HENRY NICHOLLS, OF4 BROOKLYN, NEW YORK.

HOLDING-MACHINE.

To all whom it may concern:

Be it known that I, WILLIAM H. NIoHoLLs,

.apparatus for forming molds and has for its general object the provision of means for jolting or jarring the sand in a flask or fiask member, squeezing or compressing the sand about the pattern, and drawing the pattern from the mold or mold section, during a single operation of the apparatus.

lAnother object of the invention is to p`r0- vide a molding machine having two relatively movable pressure heads for pressing thel sand about the pattern in the flask orv flask member7 and magnetic means carried by one of the pressure heads for automatically A drawing the pattern when the pressure heads are separated.

'Another important object of the invention is to provide a molding machine having a reciprocable flask supporting member, a .nor

mally stationary pressurehead ada ted to be swung laterally into and out of t e path of the flask supporting member, electromagnetic pat-tern drawing means carried by said pressure head adapted to be engaged by the pattern or pattern plate when the flask support is moved toward the pressure head, and means for automatically making and breaking the circuit through the electromagnetic drawing means by the act of swinging the pressure head respectively into and out of register with the flask supportin member.

Another important object of t e invention is to provide a molding machine having a combined pressure head and electromagnetic pattern drawing device, and meansoperated automaticallymby apart of the molding machine for magnetizing and demagnetizing said combined pressure head and drawing device. 'r

A further object of the invention is to provide a molding machine of the squeezer type having a magnetic pressure head adapted to be engaged by the pattern plate andv to hold and draw said plate from the moldupon separation of the pressure head and mold.

ln the accompanying drawings- Figure 1 is a sidelelevation of the apparatus partly in vertical section;

Specification of Letterslatent.

Patented Feb. 1,. 1921.

Application led .Tune 25,1919. Serial No. 306,676.

Fig. 2 aplan view of the apparatus, the

normally stationary pressure, headl being shownswung laterally; i

Fig. 3 a sectional view on an enlarged scale taken through the circuit making and breaking means; l Fig. 4 a detail section on the line IV-IV of Fig. 6;

5 an inverted plan of the valve disk; j Flg. 6 detail view partly in vertical section showing' the valve for controlling the.

fluid pressure supply;

F1g. 7 an enlarged fragmentary section showing the manner of packing the main piston; g I i Fig. 8 an inverted plan ofthe Lvalve caslng; and y, i

Fig 9 a plan View of the large squeezing plston. H

In the preferred embodiment of the invent1on illustrated in the drawings, the based of the machineis formed at its upper end wlth a cylinder 2 having an open upper end. A large hollow piston 3 having an open upper end 1s adapted to reciprocate vertismall cylinder 4. The cylinder 4 has an open upper ,end and a port-5communicatinfJr 4with the interior of the hollow piston 3.-

small jolt piston 6 is adaptedto reciprocate vertically 1n the cylinder 4 relatively to the mam plston and saidjolt piston is rigidly held to the under side of a pressure head or flask support 7 which normally rests on the upger end of; the main piston 3. v rackets 8 and4 8El extend horizontall from opposite sides ofthe cylinder 2 and a valve for controllin the supply of fluid pressure to the cylin ers 2 and 4 is mounted on the bracket 8.' This controlling valve comprises a horizontally divided two-part casing 9 in which is mounted a rotatable valve disk l() having two recesses 11 and 12 in the under side thereof and two pairs of oppositely disposed lugs" or projections 13 lcally in the cylinder 2 and is formed with"av on the upper side thereof. The valve disk ing is provided with four openings 18, 19

20 and 21 extending through the bottoni thereof. The opening 18Acommunicates with a flexible pipe 22a connected with a pipe 22v which extends through the jolt piston 6 and communicates with the small cylinder 4. The opening 19 communicates with an air supply pipe 23 connected with. a

` under pressure is admitted from the cylinmagnet cores.

vboss 32 formed on the bracket 8a.

der 2 into channel 27 at the inner side of the packing ring 28 through a plurality of passages 30.

An upright post 31 is rigidly held in a 4 A collar 33 is rigidly held to the post 31 adjacent the upper end of. the post, and a laterally swinging arm 34 is pivotally held at one end to the post between said collar 33 and a collar 35 which is locked on the post by a nut 36. A vertically extending ro'd 37 is rigidly held at its'upper end by nuts 38 to the free end of arm 34. .The lower portion of rod 37 is adapted to engage in Ia slot or recess r39 formed in one side of a boss 40 on the bracket 8, and a nut 41 is threaded. on the lower end of said rod and is adapted to en gage under the boss 40to resist upward pressure against the arm 34. The rod 37 and boss 40 serve also to limit the movement of arm 34 in one direction to arrest-the upper pressure head at a point in register with the lower pressure head 7. l

The upper pressure head or member comprises a rectangular block 42 rigidly held to the. lower end of a screw 43 threaded through the arm 34 midway the ends of said arm, and a magnetic pressure head and pattern drawing device 44 of rectangular form rigidly held to the under side of the block 42.` The magnetic pressure head 44 may be of any suitable construction. As shown, said head comprises a box-like cast-iron casing in which a plurality of electro-magnets 45 of the welleknown horse-shoe type are mounted. A plurality of soft steel pole pieces 46 extend through the under sideof thev casing and are insulated'therefrom by sleeves 47 of non-magnetic metal. .The lower ends ofthe pole pieces are Hush with the under face of the head 44 and the upper ends thereof engage against the ends of the Current is supplied to the magnet coils in the usual manner through line wires 48 and 49 which lead into the head 44 at one end and are connected at their opposite ends with a suitable attachment plug 50 adapted to be engaged in a suitable wall socket. It will be obvious however that the wires 48 and 49 may be connected in various other ways with a suitable source of electrical current.

Means is provided operated by a movable part of the machine for automatically making and breaking the circuit through the coils of the magnets at the proper times during the operation of forming a mold. For

.this purpose, a circuit-making-and-breaking device or switch is interposed in the line wire 49 at a point intermediate the plug 50 and the head 44. This circuit-making-andbreaking device comprises a switch casing or box 51 in which is mounted a stationary terminal or contact 52 and a movable resilient terminal or contact 53, to each of which one branch of the wire 49-is connected. The spring metal contact plate 53 is normally out of engagement with the contact 52 and is adapted to be flexed and forced into engagement with said contact 52 by a fiber pin or actuating device 54. The ber pin 54 slides in-an aperture in boss 40 on bracket 8 and the outer end thereof is normally projected into the slot 39 in said boss by the resilient contact 53. The pin 54 is provided at its inner end with a collar 55 for limiting the outward movement thereof, and the outer end of said pin isl adapted to be engaged by the rod 3 when said rod is swung into the slot 39.

The squeezind piston 3 is held against rotation in its cylinder 2 by means of a post 56 rigidly held to the cylinder head and extending upwardly through an aperture in the head of the hollow squeezing piston. The post 56 is formed with an enlarged head 57 which serves to prevent accidental forcing of the piston 3 vout of the cylinder 2: The pressure head 7 and'jolt piston 6 are held against rotation by a pin 58 depending from the head 7 and passing through an aperture is a spider59. The spider 59 is formed integrally with cylinder 4 and piston -3 and serves also to brace the upper ends of said cylinder and piston without obstructing the escape of air from cylinder 4 through port 5 to the atmosphere through the open upper end of the holloxvsqueezing piston 3 during the jolting operation, as hereinafter described.

The mold frame 60 may be of any suitable construction. As shown, said frame comprises one section of the well-known interchangeable cope and drag, divided metallic flask having the usual lateral projections or handles 61 each of which is provided with a rigid upwardly extending pin 62. rllhe usual bottom board 63 its within the lower end oiV the mold frame or flask section 60. rThe pattern plate shown is ot special construction but it will be obvious that various forms or pattern supporting. means comprises a lower plate 64 yformed of aluminum or other non-magnetizable metal andan upper plate 65 formed of soft steel or other magnetizable metal and rigidly secured-by rivets or sand in the mold frame is thus jarred and.

Vevenly compacted therein.

otherwise to the plate 64. rI`he plate 64 is formed with thel usual handle portions or lugs 66 each of which is provided with the usual pair of apertures 67 adapted to receive the pins 62 on the handles 61 of the cope and drag members of the type of flask shown. lhe pattern or patterns 68 are secured in the usual manner to the under side of the pattern' plate.

'Io form a mold the dash and pattern are placed on the head 7 with the pattern plate resting on the head, and the flask is then filled with sand. v The handle 14 is then turned to permit air to flow from the source of supply through the pipe 23, port 19, valve cavity 11, port 18 and pipe sections 22a and 22 into the small cylinder 4 beneath jolt piston 6. The piston 6 and head 7 will thus be elevated slightly until exhaust port 5 is uncovered, whereupon the piston and head will drop, this operation being repeated inrapid succession as long as the controlling valve 1s held in the position just descrlbed. The

The surplus sand is then struck oil level with the to of the Hash and the board 63 put in lace. he llaslr is then inverted or rolle over and placed upon head 7 with the bottom board 66 resting upon the head and the pattern` y l plate resting upon the u per end of the tlaslr, as shown in Fig. 1.' he arm 34 is then swung horizontally until rod 37 engages in slot 39 in the boss 40 formed on bracket 8. This movement of arm 34 noteonly carries pressure head 44 directly over the pressure head 7, but also automatically closes thecircuit through the coils of the magnets 45 since rod 37 ,as it passes into slot 39, forces pin 5 4 inwardly and thus presses resilient contact 53 against contact 52. The handle 14 is then turned to connect ports 19 and 20 through valve cavity '12, and thus admit air from pipe 23 into the large cylinder 2 below squeezing piston 3 by way of pipe 24 and re cees 25, whereupon piston 3 will be forced upwardly, carrying with it the head 7 and the mold frame. As head 7 moves upwardly the pattern plate will abut against the under face of the magnetic pressure head 44 land the mold will be squeezed between the heads 'l' and 44, forcing bottom hoard 63 upwardly within the frame or liaslr section 60 and .firmly packing or ramming the sand about the patterns. Handle 14 is then turned to connect 20 and 21 through valve cavity 12 to exhaust the air from cylinder 2 through the pet cock 25 whereupon the piston 3, head 7, and the flask frame 60 with the formed mold, will move downwardly to their starting point. 'lhe pattern plate with the patternsv attached thereto will, however, he held to the under face of the head 44 owing to the lifting effect of'the magnetic lines of force which pass'between the pole pieces 46 of the electro-magnets 45 through the soft steel to plate or section of the pattern plate. he pattern or patterns held to the patternplate are thus drawn from the mold automatlcally when the pressure heads 7 and 44 are separated at the completion of the squeezing o eration.v The operator then removes the ash. After they removal of the dash the operator grasps the pattern plate by the handles 66 and pushes the same laterally, causing the arm 34 to swing horizontall to carry the head 44 out of alinement wit head 7 This movement of arm 34 not only carries head 44 out of the way of the thus be seen that means has been providedV H whereby molds may be jolted and squeezed, and the patterns drawn therefrom and am sembled with another mold frame with great rapidity;

vlilhat I claim is: f

` 1. In a molding apparatus, the combination of relatively movable mold squeezing members,' means for imparting a relative movement between said members, and mag llll netic means on one of said members for holding a pattern against movement relatively to said member upon separation of the members.

. 2. In a molding apparatus, the combination of a magnetic mold-squeezing and pattern-drawing pressure head, a mold and` pattern support, and means for moving said support toward and from said head to squeeze a mold and automatically draw a pattern therefrom during a singlemove- Energ: of the support toward and from the ea 3,v In a molding apparatus, the combination of an electro-magnetic mold-squeezing and pattern-drawing pressure head,means for magnetizing and de-,magnetizing said head, a mold frame support, and means for moving said support toward and from the pressure'head to squeezea mold and drawa pattern therefrom during a single movement of the support toward and from the head. i 4. Ina molding apparatus, the combination of an electro-magnetic mold-squeezing and pattern-drawing pressure head, means for magnetizing A. and de-magnetizing said l head,a mold frame support, and'means for impartin arelative movement between said` head an otherto squeeze a mold and draw a pattern therefrom.

5; Ina molding apparatus, the combination of `an electro-magnetic mold-squeezing j and pattern-drawingv pressure head, "means for ,'magnetizin'g and dema'gnetizing `said head, ai mold frame 'and'pattern lplate `sup. port movable toward and fromjsad head,

and a' magnetizable pattern plate movable with'said support into engagement with i v' said head.

16. In a molding apparatus, the combination of a vertically reciprocable mold frame support, a'v mol'd squeezing and vpatterndrawing pressure head, 'a laterally shiftable ,support for said head, andmeans for auto- 'maticall'y magnetizing and -de-magnetizing said head when` the'head is shifted respectively intoand outv ofregister with, the reciprocablesupport. f y;

7.' In a molding apparatus, the"` combination of a vertically reciprocablemfold fra-me support, amcld-squeezing and patterri-draw' -L ing pressure head, a laterally shiftable support for said head, means for automatically magnetizing and de-magnetizing said head when the head :is lshifted respectivelyinto' and out ofregister with the 'reciprocable support, 'andmagnetizable pattern-holding 4meansadapted to rest upon a mold"rame carried by the support.'

8. In a nioldin "apparatus, tion of magnetiza le pattern-holding means, relatively reciprocablev mold-squeezing members, and. electromagnetic pattern-drawingk means carried by one of said members.

9. In a molding apparatus, the combination of a mold-squeezing pressure head, electromagnetic lpattern-drawlng means carr1ed by said head, a vertically -reciprocable iaskv support, a ask -mounted on the support, magnetizable pattern-holding means able pattern-holding` means separably separably ,held'to the flask, and means for lmarting a preliminary jarring movement an a subsequent up and down squeezing and drawing movement to the flask support.

support .toward and `from each the combination of a vertical mold and draw a pattern therefrom during a single 'movement of the support toward and from'the head.

11.A In a molding apparatus, the combina- .tio'n o f a reciprocable flask support, an

electro-magnetic 'mold-squeezing and pattern-drawing head, a 'swinging support for said head whereby the head may be shifted into and `out of' alinement with the iask support, a flask mounted on the flask support, magnetizable pattern-holding -means separably held to the flask, means controlled by the swinging movement of the head support for lmagnetizing and de-magnetizing the head when the head is shifted into and out o f alinement with the flask support, and means for moving the flask support toward and from the head to squeeze a mold and draw a pattern therefrom during a single movement of the iiask support toward and from the head. i

12. In av molding apparatus, the combination of mold forming means, an electromagnetic means controlled by the operation of the mold forming means'forautomatically llrawin a pattern from a mold formed by the mol -forming means.

13. In a molding apparatus, the combina- `tion of a pattern, means for compat-ting sand about the patternto form a mold, and electro-magnetic means controlled by the .sand campacting 'means for automatically 'drawingthe pattern from a formed mold and releasing the drawn pattern.

14E.V In a'molding apparatus, the combinal'tion of a iask, a pattern plate supported the flask and having a magnetizable por- `t1on,- a mold-squeezing pressure head, an

VVAeleetromagnet carried by said head adapted to be engagedby the magnetizable portion ol 'the'patternplate, and means for moving the fiask toward and from the pressure head to squeeze sand in the flask and separate the flask and pattern plate during a single movement of the ask toward and from the head. i

15. In a moldin apparatus, the combinareciprocablev flask sup* port, a flask, a mol squeezing pressure head shiftable laterally into and .out of the path of the flask support, an electro-magnet movable laterally with the pressure head, means controlledl by the movement of the pressure head into and out of the path of the flask support for energizingV and denergizing said electro-magnet, and magnetizable means adapted t0` engage said electro-magnet when the flasksupport is moved upwardly toward the pressure head and having a pattern on its under side.

This specification signed this twenty-first day ,of June, A. D. 1919.

WILLIAM HENRY NICHOLLS.

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