Shearing press of opposing die type

Claim 1

A hydraulically actuated press of the opposite die type comprising in combination: a lower unit including a press table that defines the lower limit of a working space in which cutting is performed, said table having a central recess in the top thereof and defining a pressure cylinder chamber therein; a main piston being mounted for vertically slidable movements within said cylinder chamber and having a central depression; a central apertured main bolster fixedly coaxially supported on said main piston; a central apertured lower die member coaxially mounted on said main bolster; and an ejector coaxially mounted within said central depression and extending upwardly through the apertures of said main bolster and said lower die member; an upper unit including a central apertured upper die member coaxially positioned in a cooperative relationship with said lower die member; said upper die member having an annular protrusion formed integrally therewith on its bottom portion thereof; a central apertured floating bolster coaxially disposed opposite to and cooperating with said main bolster, said floating bolster being floatable over a short stroke movement of the piston; said upper die member being fixedly mounted to the underside of said floating bolster; a central apertured press crown coaxiAlly associated with said floating bolster, said press crown defines the upper limit of said working space; and a break-out punch coaxially mounted within the apertures of said upper die member, said floating bolster and said press crown and extending downwardly therethrough to operatively cooperate with said ejector; and in addition, hydraulic means associated with said ejector and said break-out punch for producing upward and downward pressures thereof; and stop means on said upper and lower units to limit said stroke movement; said upper and lower die members adapted to receive a workpiece therebetween from which a blank is to be cut; the lowermost end of the stroke movement establishing the position of said workpiece for coming into contact with said protrusion of said upper die member and finally cutting off said blank.