Method and apparatus for hydraulic pressing

Details Method and apparatus for hydraulic pressing Method and apparatus for hydraulic pressing

1992-10-16

1994-07-05

Bertsch, Richard A.

Power plants

Pressure fluid source and motor

With control means for structure storing work driving energy

60420, 264 405, 264 65, 425149, 425352, F16D 3102, B29C 4358

Patent

active

053256689

ABSTRACT:
In a hydraulic circuit a positive-displacement pump has a flywheel. An actuation motor is attached to the positive displacement pump. The pump is capable of directing liquid flow either towards the tank or towards a hydraulic cylinder. The control of flow direction is determined by a first valve which is connected on the output side of the pump in order to discharge the flow of the positive displacement pump either to the tank or to the cylinder. The opening speed of the first valve is controlled. A bistable valve feeds the pilot line of the first valve. A distribution valve, connected with the output side of the pump feeds two pressure lines.

REFERENCES:
patent: 3069742 (1962-12-01), Walchhutter
patent: 3359608 (1967-12-01), Walchhutter
patent: 4363612 (1982-12-01), Walchhutter
patent: 4459807 (1984-07-01), Koppen
patent: 4515181 (1985-05-01), Dezelan
patent: 4625513 (1986-12-01), Glomeau
patent: 4706930 (1987-11-01), Lexen
patent: 4864994 (1989-09-01), Myers
patent: 5158723 (1992-10-01), Walchhutter et al.
patent: 5184466 (1993-02-01), Schniederjan et al.

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