Patent ID: 6749185
Filing Date: 2004-06-15
Classification: F16F

Abstract:
A cushion assembly for use in a press, said cushion assembly comprising a tubular cylindrical outer wall, a first end wall at least partially enclosed by a first end portion said outer wall, said first end wall having a first recess formed therein, a second end wall at least partially enclosed by a second end portion of said outer wall, said second end wall having a second recess formed therein, a tubular cylindrical inner wall extending between said first and second recesses, said inner and outer walls cooperating with said first and second end walls to at least partially define an outer chamber containing gas under pressure and lubrication liquid, said inner wall cooperating with said first and second end walls to at least partially define an inner chamber containing gas under pressure and lubrication liquid, a piston disposed in said inner chamber, a piston rod connected with said piston and extending through said second end wall, said piston being movable along an inner side surface of said inner wall in a direction toward said second end wall under the influence of gas pressure in said inner chamber during operation of the press, said piston being movable along the inner side surface of said inner wall in a direction away from said second end wall under the influence of force transmitted from the press through said piston rod to said piston during operation of the press, and a passage formed between an end portion of said inner wall and first end wall to conduct a flow of lubrication liquid and gas from said outer chamber to said inner chamber during movement of said piston toward said second end wall and to conduct a flow of lubrication liquid and gas from said inner chamber to said outer chamber during movement of said piston away from said second end wall.