Diaphragm type hydraulic press

Claim 1

IN AN APPARATUS FOR THE TYPE DESCRIBED FOR FORMING A WORKPIECE, FIXED HEADS MEANS, AN ANNULAR MEMBER MOVABLE AXIALLY TOWARD AND AWAY FROM SAID HEAD MEANS FOR COMBINING WITH SAID HEAD MEANS FOR PROVIDING A WORKPIECE ACCOMMODATING CAVITY, SAID ANNULAR MEMBER HAVING AN INNER WALL SURFACE SUBSTANTIALLY PARALLEL TO ITS AXIS, A RING ELEMENT SECURED TO SAID HEAD MEANS AND ENGAGEABLE WITHIN SAID INNER WALL SURFACE, AND RESILIENTLY EXPANDABLE DIAPHRAGM MEANS MOUNTED ON SAID HEAD MEANS WITHIN SAID RING MEANS FOR TRANSVERSING SAID ANNULAR MEANS, SAID DIAPHRAGM MEANS INCLUDING A RADIALLY OUTWARDLY EXTENDING MARGINAL FLANGE PORTION CLAMPED BETWEEN SAID HEAD MEANS AND SAID RING ELEMENT, SAID RING ELEMENT INCLUDING AN AT LEAST PARTIALLY DOWNWARDLY FACING SURFACE OUTWARDLY OF AN INNER EDGE THEREOF, SAID DIAPHRAGM MEANS INCLUDING A SIDEWALL PORTION EXTENDING FROM SAID MARGINAL FLANGE PORTION DOWNWARDLY AROUND SAID RING ELEMENT INNER EDGE AND BENEATH SAID DOWNWARDLY FACING SURFACE, SAID RESILIENTLY EXPANDABLE DIAPHRAGM MEANS BEING EXPANDABLE BY FLUID UNDER PRESSURE FOR ENGAGING AND FORMING A WORKPIECE POSITIONED IN SAID CAVITY AND FOR ENGAGING AND RADIALLY EXPANDING SAID RING ELEMENT INTO TIGHT SEALING ENGAGEMENT WITH SAID INNER WALL SURFACE AND UPWARDLY AGAINST SAID HEAD MEANS.