Hydraulic drive

Details Hydraulic drive Hydraulic drive

2008-05-13

2008-05-13

Leslie, Michael (Department: 3745)

Motors: expansible chamber type

Fluid supply through diverse paths to single expansible chamber

Second path activated in response to pressure or flow in...

C091S41700A, C060S486000

Reexamination Certificate

active

07370569

ABSTRACT:
What is disclosed is a hydraulic drive mechanism for a blanking or forming machine comprising a working cylinder having several pressure chambers, the piston of which acts directly or indirectly on a workpiece to be processed, wherein at least one pressure chamber of the working cylinder for retracting and extending the piston is adapted to be subjected to a tank pressure or a supply pressure via a continuously adjustable valve, and comprising a valve assembly arranged upstream of the continuously adjustable valve, whereby an inlet port of the continuously adjustable valve may be subjected to a higher or lower supply pressure, wherein the valve assembly comprises a switching valve adapted to be switched over between a basic position and a switching position in dependence on the load pressure at the working cylinder in order to tap the supply pressure from a low-pressure source or from a high-pressure source.

REFERENCES:
patent: 4825745 (1989-05-01), Kuttruf
patent: 4873912 (1989-10-01), Schulze
patent: 5042362 (1991-08-01), Schulze
patent: 32 19 730 (1983-12-01), None
patent: 37 20 266 (1988-12-01), None

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