US1893234A - Press for plastic material - Google Patents

Description

Jan. 3, 1933. J. L. HUNTER 1,893,234

PRESS FOR PLASTIC MATERIAL Filed April 28. 1950 5 Sheets-Sheet 1 Jan. 3, 1933..

J. HUNTER PRESS FORPLASTIC MATERIAL Filed April 26. 1950 5 Sheets-Sheet 2 2e 1;??? 6 4g 0 72 ll 7'. 31 y Jan. 3, 1-933. .1. L. HUNTER.

PRESS FOR PLASTIC MATERIAL Filed April 26, 1950 liven 5 iii) Patented Jan. 3, 1933 Eran STATES.

JOHN L. HUNTER, or wAUKneAn, rumors, assrenon T Ashram! BA TERY communes coerceuct on wauirneaiv, rumors, a coaronarronor ILLINOIS PRESSFOR PLASTIC MATERIAL Application filed April 26,

My invention relatesmore particularly to presses for use m the manufacture of containers formed from moldable material such 1 as for example and more especially asphaltic compositions, the invention having been demum; and other objects as will'be manifest x 1n the cylinder in any Sll'l'titblfi way, as .for

from the following description. 7

Referring tothe accompanying drawings: Figure 1 is a view'in sectional elevation of a machine embodying my invention. Figure 2 is a plan sectionalview taken at the line 22 on Fig. 1 and viewed in the direction of the arrows.

Figure 3 is a plan sectional view taken at the line 33 on Fig. 1 and viewed inthe direction of the arrows.

Figure 4 is a perspective view of one of the side-forming plates of the moldconstituting a partof the machine. n Figure 5 is a broken enlarged view in sectional elevation, the section being taken at the irregular line 55 on Fig. 2 and viewed in the direction of the arrows, the parts shown of the machine being represented in the-positions they assume during the molding operation. I

- Figure 6 is a view like Fig. 5 showing the position assumed by the side-forming plates of the mold upon the movement of the latter to a position for releasing the container formed therein, the container having been removed from the mold.

Figure '7 is a sectional view taken at the line 7'? on F i 1 and viewed in the direction of the arrows.

Figure-8 is a view in vertical sectional ele- 1930. Serial NGL 447,590.

vation of the core structure forming a part or the machlne; and r Figure 9, a section taken at the. line 9 on Fig. 8 and viewed inthe directionof the arrow.

Referring toithe particular, illustrated, embodiment of my invention, the machine comprises a base 10 presenting an upwardly opening cyl nder 11, upwardly extending rods 12 disposed in rectangular arrangement and rising from the case 10, and a head 13 surmounting,and rigidly connected with, the

rods 12 to extend-in vertically spaced relation to the baselO. V

The machine alsocomprises a vertically movable ram formed of a piston 1% vertical ly movable in thelcylinder 11 and a head 15 rigidly secured to the top of the piston 14, this ram being adapted to be forced upwardly example by fluid pressure introduced into the bottom of the cylinder 11 through a pipe 16 communicating with any suitable source of ar under pressure and having interposed therein a valve device 17 by which air pressure may be supplied .to the bottomof the cylinder 11 or permitted to vent therefrom to the atmosphere, as desired;

The head 15 is provided at its topwith a port on 18, shown as a part separate from the body portion of the head 15 and forming the bottom of the mold in which the container is tozbe formed, the member 18 which is of rectangular shape, being provided about its four sides w th laterally extending'fianges 19.

The sides of the mold areformed of four plates 20 disposed in a rectangular arrangement as shown, the adjacent edges of these plates being stepped tocause them to mutually interfit when in mold-forming position, all as shownmore particularly in Fig. 3, each plate 20 having an inturned lip 20 at its upper edge.

The plates 20 are adapted to be swung, as

lOO

into the grooves 2'1 of the respective plates 20.

Surrounding the lower edge portions of the plates 20 is a frame 22 provided with four depending pins 23 slidable in vertical openlugs 24 in the head 15, the lower ends of these pins opposing the upper surface of a ring 25 surrounding the piston 14 and forming a part of the stationary base structure 10.

The frame 22 contains in its under-surface and about the central opening through the frame, an endless recess 26 in which a frame like plate 27 is secured as by bolts 28. The member 27 surrounds the lower extremities of the plates 20, the outer surfaces of which are beveled as represented at 30, the opposing surfaces of the walls of the opening in the member 27 being similarly beveled as represented at 31. The arrangement and proportions of the parts just described are such that when the member 22 occupies the position shown in Fig. 5 the plates 20 may occupy the position shown in Fig. 5 without restraint from the plate member 27, but when the plate member 27 is raised relative to the head 15 as hereinafter described and as shown in Fig. 6, the plates 20 will be forced to assume the outwardly swung position represented therein, the plates 20 in such movement swinging about the flanges 19 as fulcrums.

Means are associated with the lower portions of the plates 20 tending to swing them to the closed position shown in F 5. these" means comprising T-bolts. 32 which extend at their shanks through slots 33 in the lower edges of the plates 20 and interlock at their T-heads 34 with grooves 35 on the inner surfaces of these plates, these shanks extending outwardly through openings 36 in the frame 22, their terminal ends carrying nuts 37 between'which and shoulders 38 provided in the openings 36 coil springs 39 surrounding these shanks, extend.

The head 13 is formed to present a vertically extending cylinder 40 in which a piston 41 the side-wall-forming plates 20 of the mold rounds the plates 20 as shown in Fig. 1. The

- plates 20 are so formed that when in the closed position shown in Fig. 1 their outer surfaces incline toward the vertical axis of the machine'as represented at 48 and the wall of the opening 49 in the die, box is inclined at its four sides at a corresponding angle but in the reverse direction as shown.

In the-machine shown provision is made for admitting fluid pressure to either end of the cylinder 40 and exhausting the latter as desired, the means shown for this purpose comprising pipes 50 and 51 which open, re spectively, into the bottom and top of the cylinder 40 and into a valve casing 51 containing an inlet 52 communicating with a pipe 53 leading to any suitable'source of fluid pressure, as for example compressed air. The casing 51 contains a rotatable valve plug 54 containing a straightway port 55 adapted when the valve is moved into one position to cause opposite ends ofthe cylinder 40 to be in communication with each other. When the valve 54 is rotated counterclockwise in Fig. 1 approximately 45 the port 57 moves into registration with the inlet pipe 53 and the pipe-51, and the port 56 into registration with the pipe 50 and a vent opening 58 in the casing 51 whereby fluid pressure is admitted to the top of the cylinder 40 and the lower portion of this cylinder is vented to the atmosphere. Rotation of the valve 54 in a clockwise direction in Fig, 1 approximately 45 from the position therein shown, causes the port 57 to communicate with thepipes 50 and 53, and the pipe 51 with the outlet 58 whereupon fluid pressure is admitted to the lower end of the cylinder and the upper end of'the cylinder is vented to the atmosphere.

The machine also comprises a core supported on the head 13 in axial alinement with the piston 14, andwith which the mold structure above described cooperates in the forming of the container, the-particular core construction shown comprising three core sections 59 for forming a container presenting three compartments, these core sections being spaced apart as shown, their combined base portions presenting a rectangular structure 60 about which the upper portion 61 of the side wall of the mold structure closely extends when the machine is operated to the position shown in Fig. 5. In the use of the machine the piston '14 i positioned as shown in Fig. 1, namely, to extend a slight distance above the bottom of the cylinder 11, in which position the moldside-forming plates 20 extend in mold-forming positionas shown, the frame 22 being in lowered position, and the die box 46 surrounding the mold formed of the plates 20, as shown,-.theupper edges of the plates 20 extending above the upper edge of the die box 46 in this position of the mechanism.

In this position of the parts described the material from which the container is to be formed and which, by way of example may be any suitable asphaltic composition such as that commonly used, is then laid on the up per surface of the bottom-forming. plate 18 toextend within the space presented between the plates 20 as shown in Fig. 1.

Nith the material positioned as stated, fluid pressure is introduced into the bottom of the cylinder 11 which forces the member 15 and the parts carried thereby, together with the die box i6, t is rods 45 and the piston 41, upwardly, the upper edges of the plates engaging the base of the core member and the core sections 59 becoming engaged by the mass 62 of the material which latter, under the pressure exerted against it by the core sections, is caused to be forced into all portions of the mold cavity provided between adjacent core sections and between the latter and the wall and bottom-forming portions of the mold as shown in Fig. 5 to term a homogeneous integral mass in the form of the container desired to be produced and represented at 63.

Following the forming of the container as stated, the operator causes the die box 4:6 to be raised by admitting fluid pressure beneath piston ll which is effected by actuating the valve 5% in a direction to admit fluid pres sure beneath piston 41 which relieves the lateral restraint imposed on the plates 20 by the die box, and thereupon causes the mold structure, with the formed container therein, to lower by opening the cylinder 11 to exhaust which strips thecontainer from the core-sections.

As the piston lat nears the limit of its movement to lowermost position, the pins 23 abut the upper surface of the member 25 whereupon downward movement of the frame 22 is arrested whereby in the continuing lowering of the pistonlet, the beveled surfaces of the plates 20 ride against the member 27 thereby producing a camming action against the lower portions ot the plates 20 which swing them upon the fulcrum-forming flanges 19 in an outward direction as shown in Fig. 6 thereby releasing the formed container and permitting it to-be removed from the machine.

The piston 1st is then slightly raised to. the position shown in Fig. 1 in which movement the mold structure rises relative to the frame 22 to the position shown in th s figure which permits the springs 39 to rock the mold plates 20 into the mold-forming condition shown in Figs. 1 and 5, whereupon the operator manipulates the valve 5 1 to lower the die box 46 to the position shown in Fig. 1 for restraining the mold plates 22 against lateral displacement, the structure then being ready to receive another lump of material for forming another container.

By providing the means for admitting fluid pressure above the piston 41, the descentof the die box 16 may be accelerated in the operation above described.

The die-box 46, thelower port on: of the head 13 and represented at 6 1 and the core structure supported thereon, are shown as provided with passages therein. The. passages in the die box 46 are represented at. these passages being in communication with each other and with an inlet pipe 66 and an outlet pipe 67. The passages in the member and which are in commun'. cation with each other are represented at 68 and are connected with'an inlet pipe 69 and an outlet pipe 7 0'; and the passages in the core sections 59 are represented at 71 and communicate with inlet pipes 72 and outlet pipes 73.

It is desirable, in the manufacture ofcontainers from asphaltic compositions that the temperature of the parts of the machine with a 'which the material contacts be that approximating that of the material which is introduced into the machine at approximately 350 F. by way of example. Accordingly, it is desirable that a heating medium be circulated through the passages in the die box 46 prior to thestarting of the pressinto opera tion, such a medium as for example steam, being introduced into the die box through the pipe 66. Where the conditions are such that continued operation of the press ra ses the temperature of the structure beyond that desired, any suitable cooling medium may be circulated through the passages in the die box. I

The machine described isalso suited for able material in which case any suitable heating medium, as for example steam, may be clrculated through the passagesln the die box 46, member-(Stand the passages 71 in the core sections 59, the latter being shown as recessed at 7% to receive electrical heating elements (not shown) for use, if desired, in the vulcanizing of the material.

lVhile I have illustrated and described a particular construction embodying my invention, I do not wish to be understood as intending to limit it thereto, as the same may be variously modified and altered without departing from the spirit of my invention.

WVhat I claim as new, and desire to secure by Letters Patent, is: p

1. In a machine of the character set forth, the combination of receptacle-forming mold and core members, the side walls of said mold memberbeing movable toward and away from each other and saidmold member being movable relative to said core member, means for holding said side walls against outward movement in the molding operation, and means engageable with a relatively stationary part of the machine in the movement of said mold member in a direction away from said core member operating automatically to force said side walls outwardly.

2. In a machine of the character set forth, the combination of receptacleformingmold and core members, the side walls of said mold member being movable toward and the manufacture of containers from vulcanizaway from each other and said mold member being movable relative to said core member. means for holding said side walls against outward movement in the molding operation, and wedging means engageable with a relatively stationary part ofthe machine in the movement of said mold member in a direction away from said core member operating automatically to force said side walls outwardly. 3. In a machine of the character set forth, the combination of receptacle-forming mold and core members, the side walls of said mold member being fulcrumed to swing outwardly and said mold member being movable relative to said core member, means for holding said side walls against outward movement in the molding operation, and means engagcable with a relatively stationary part of the machine in the movement of said mold member in a direction away from said core member operating automaticallyto force said side walls outwardly.

l. In a machine of the character set forth, the combination of receptacle-forming mold and core members, the side walls of said mold member being movable toward and away from each other and said mold member being movable relative to said core member, means for holding said sidewalls against outward movement in the molding operation, and means surrounding the lower ends of said side walls and engageable with a relatively stationary part of the machine in the movement of said mold member in a direction away from said core member operating automatically to force said side walls outwardly.

5. In a machine of the character set forth, the combination of receptacle-forming mold and core m mbers, the side walls of said mold member being movable toward and away from each other and said mold member being movable relative to said core member, means for holding said side walls against outward movement in the molding operation, and a member carried by said mold member and relative, to which said mold member is movable and operative in the movement of said mold member relative thereto to force said side walls outwardly.

6. In a machine of the character set forth, the combination of receptacle-forming mold and core members, the side walls of said mold member being movable toward and away from each other and said mold member being movable relative to said core member, means for holding said side walls against outward movement in the molding operation, means for forcing said side walls toward each other, and means engageable with a relatively stationary part of the machine in the movement of said mold member in a direction away from said core member operating automatically to force said side walls outwardly against the resistance of said second-named means.

7. In a machine of the character set vforth, the combination of receptacle-forming mold and core members, the side walls of said mold member being movable toward and away from each other and said mold member being movable relative to said core member, means for holding said side walls against outward movement in the molding operation, means for forcing said side walls toward each other, and wedging means engageable with a relatively stationary part of the machine in the movement ofsaid mold member in a. direction away from said core member operating automatically to force said side walls outwardly against the resistance of said secondnamed means.

8. Ina machine of the character set forth, the combination of receptacle forming mold and core members, the side walls of said mold member being fulcrumed to swing outwardly and said mold member being movable relative to said core member, means for holding said site walls against outward movement in the molding operation, means for rocking said side walls toward each other, and means engageable with a relatively stationary part of the machine in the movement of said mold member in a direction away from said core member operating automatically to force said side walls outwardly against the resistance of said second-named means. a

9. In a machine of the character set forth, the combination of receptacle-forming mold and core members, the side walls of said mold member being movable toward and away from each other and said mold member being movable relative to said core member, means for holding said side walls against outward movement in the molding operation, means for forcing said side walls toward each other, and means surrounding the lower ends of said side walls and-engageable with a relatively stationary part of the machine in the movement of said mold member in a direc tion away from said core member operating automatically to force said side walls outwardly against the resistance of said secondnamed means. 7

10. In a machine of the character set forth, the combination of receptacle-forming mold and core members, the side walls of said mold member being movable toward and away from each other and said mold member being movablerelative to said core member, means for holding said side walls against outward movement in the molding operation, means for forcing said side walls toward each other, and a member carried by said mold member and relative to which said mold member is movable and operative in the movement of said mold member relative thereto to force said side walls outwardly.

11. In a machine of the character set forth, the combination of receptacle-forming mold and core members, the side walls of said mold member being movable toward and away from each other and said mold member being movable relative to sa1d core me iber, means for holding said side walls against outward movement in the molding operation, means engageable with a relatively stationary part of the machine in the movement of said mold member in a direction away from said core member operating automatically to force said wallsoutwardly, and means engaging said second-named means operating to force said side walls toward each other and against the resistance of which said secondnamed means operate.

12. In a machine of the character set forth, the combination of receptacle-forming mold and core members, the side walls of saidmold member being movable toward and away from each other and said mold member being movable relative to said core member, means for holding said side walls against outward I movement in the molding operation, means engageable w1th a relat vely stationary part of the machine in the movement of said mold member in one direction operating automatically to force said walls outwardly, and means engaging said second-named means operating to force said side walls toward each other and against the resistance of which said second-named means operate. a

13. In a machine of the character set forth, the combination of receptacle-forming mold and core members, the side walls of said mold member being movable toward and away from each other and fulcrumed to rock and said mold member and core member being relatively movable, means for holding said side walls against outward movement in the molding operation, a member extending outwardly beyond said side walls and relative to which said mold member is movable and operative in the movement of said mold member relative thereto to force said side walls outwardly, and spring-tensioned devices engaging said last-namedmember and said side walls beyond the fulcrums thereof and tending to move said side walls to closed position.

14. In a machine of the character set forth, the combination of receptacle-forming mold and core members, the side walls of said mold member being movable toward and away from each other and fulcrumed to rock and said mold member and core member being 15. In a machine of the character set forth,

the combination of receptacle-forming mold 1 and core members, the side walls of said mold member beingmovable toward and away from each other and fulcrumed to rock and said mold member and core member being relatively movable, means for holding said side 16. In a machine of the character set forth,

the combination of receptacle-forming mold and core members, the side walls of said mold member being movable toward and away from each other and said mold member being movable relative to said core member, means for holding said side walls against outward movement in the molding operation, means surrounding the lower ends of said side walls and engageable with a relatively stationary part of the machine in the movement of said mold member in a direction away from said core member operating automatically to force said side walls outwardly, and means engaging said second-named means and said side walls for urging the latter to closed position and against the resistance of which said side walls are forced outwardly by said second-named means.

JOHN L. HUNTER.

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