Regenerative hydraulic cylinders with internal flow paths

Details Regenerative hydraulic cylinders with internal flow paths Regenerative hydraulic cylinders with internal flow paths

1992-06-18

1993-08-24

Gerrity, Stephen F.

Presses

Reciprocating press construction

Fluid pressure actuation

7245312, 91422, 92181P, 4254512, 4254501, B30B 132, F01B 3100

Patent

active

052379167

ABSTRACT:
A regenerative hydraulic cylinder has a piston dividing its interior into a pair of chambers. A rod extends from the piston through a cylinder end wall. Several axial passages in the piston extend between opposite piston faces. A valve member is mounted over one piston face and has a sleeve that slides axially in a recess formed in the one piston face. Springs urge the valve member to a flow-impeding orientation against the piston face. A hydraulic pilot line in the rod, accessible at an external rod end, permits the valve member to be displaced away from the piston face to a flow-enabling orientation. The valve state is controlled to permit fluid flow directly between chambers during extension or contraction of the cylinder.

REFERENCES:
patent: 2711797 (1955-06-01), Muller
patent: 3700765 (1972-10-01), Aoki
patent: 3818801 (1974-06-01), Kime
patent: 4021181 (1977-05-01), Hehl
patent: 4105385 (1978-08-01), Hehl
patent: 4258609 (1981-03-01), Conway
patent: 4375181 (1983-03-01), Conway
patent: 4953458 (1990-09-01), Day

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