Fluid spring system

Claim 1

IN COMBINATION, DIE APPARATUS FOR USE IN FORMING MATERIAL COMPRISING WORK ENGAGING MEMBERS INCLUDING FIRST AND SECOND DIE MEMBERS, CERTAIN OF SAID MEMBERS BEING MOVABLE MEMBERS CONSTRAINED TO MOVE ALONG A LINEAR PATH RELATIVE TO A COOPERATING MEMBER, A FLUID SPRING ASSOCIATED WITH A RESPECTIVE ONE OF SAID MOVABLE MEMBERS AND ITS COOPERATIVE MEMBER FOR APPLYING A SUBSTANTIALLY CONSTANT FORCE YIELDABLE URGING THE MOVABLE MEMBER ALONG SAID PATH TOWARD ENGAGEMENT WITH THE WORK, SAID SPRING COMPRISING A CYLINDER MEMBER FIXED TO THE RESPECTIVE COOPERATING MEMBER AND HAVING A BORE THEREIN WITH AN AXIS EXTENDING SUBSTANTIALLY PARALLEL TO SAID PATH, A PISTON MEMBER OPERATING IN SAID BORE, A PISTON ROD OPERATIVELY CONNECTED TO SAID PISTON MEMBER AND EXTENDING OUTWARDLY FROM ONE END OF SAID CYLINDER MEMBER TO ENGAGE THE RESPECTIVE ONE OF THE MOVABLE MEMBERS, SAID PISTON ROD BEING MECHANICALLY FREE OF THE RESPECTIVE MOVABLE MEMBER FOR MOVEMENT RELATIVE THERETO ALONG THE AXIS OF THE ROD IN A DIRECTION AWAY FROM THE RESPECTIVE MOVABLE MEMBER AND THE OUTER END THEREOF CONTACTING THE OUTER SIDE OF THE RESPECTIVE MOVABLE MEMBER AND BEING MOVABLE ANGULALY IN A UNIVERSAL MANNER WITH RESPECT THERETO WHEREBY THE LOCATION OF ENGAGEMENT OF THE MOVABLE MEMBER AND PISTON ROD MAY MOVE ALONG A PATH DIFFERENT FROM THE AXIS OF THE CYLINDER DURING THE YIELDING OF THE SPRING, MEANS SUPPORTING SAID PISTON MEMBER IN SAID CYLINDER MEMBER FOR UNIVERSAL ANGULAR MOVEMENT RELATIVE TO THE CYLINDER MEMBER, AND A CLOSED SYSTEM FOR SUPPLYING GAS UNDER HIGH PRESSURE TO SAID CYLINDER COMPRISING A RESERVOIR TANK CHARGED WITH GAS UNDER HIGH PRESSURE AND CONDUIT MEANS CONNECTING SAID TANK TO SAID CYLINDER WITH THE PRESSURE THROUGH SAID TANK CYLINDER AND CONDUIT MEANS BEING UNIFORM.