Hydraulic element and drawing die assembly

Details Hydraulic element and drawing die assembly Hydraulic element and drawing die assembly

1987-06-18

1989-01-10

Combs, E. Michael

Metal deforming

By use of closed-die and coacting work-forcer

Cup or shell drawing

72350, B21D 2402, B21D 2414

Patent

active

047964537

ABSTRACT:
A hydraulic element including a working cylinder defining a cylinder chamber having an axis and containing hydraulic medium, a working piston movable in the cylinder chamber along the axis and having an interior end arranged to communicate with the hydraulic medium in the cylinder chamber, and an annular piston movable in the cylinder chamber, along the axis, and enclosing the working piston, the annular piston having an interior end communicating with the hydraulic medium in the cylinder chamber so that movement of one of the pistons in a first direction along the axis causes the other of the pistons to move in a second direction opposite to the first direction.

REFERENCES:
patent: 3751962 (1973-08-01), Cvacho et al.
patent: 4363232 (1982-12-01), Reitter
patent: 4530224 (1985-07-01), Hild et al.

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