Metal deforming – By deflecting successively-presented portions of work during... – By use of work-contacting wiper and moving – work-holding form
Patent
1997-06-03
1998-10-13
Hail, III, Joseph J.
Metal deforming
By deflecting successively-presented portions of work during...
By use of work-contacting wiper and moving, work-holding form
72149, 72 201, 60476, 60484, B21D 704, B21B 3708
Patent
active
058195742
ABSTRACT:
A hydraulic device provided with a plurality of hydraulic actuators directly connected to a hydraulic pump for control. A hydraulic pump is operable in both rotational directions when the electric motor is rotated forwards and in reverse. Ports of each hydraulic actuator are connected via a connecting line in parallel with ports of the hydraulic pump. A plurality of electromagnetic valves are provided in the connecting lines to the hydraulic actuators. By opening or closing each electromagnetic valve, the operation of the associated hydraulic actuator is controlled. The operation direction of each hydraulic actuator is controlled by rotating the electric motor clockwise or counterclockwise. Further, a position sensor is provided for detecting displacement of the specified hydraulic actuator and the electric motor is controlled based on a signal transmitted from the position sensor.
REFERENCES:
patent: 5259224 (1993-11-01), Schwarze
patent: 5343725 (1994-09-01), Sabine
patent: 5632176 (1997-05-01), Bhandari
Butler Rodney
Hail III Joseph J.
Kabushiki Kaisha Opton
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