Power plants – Pressure fluid source and motor – Pulsator
Reexamination Certificate
2006-10-24
2006-10-24
Lazo, Thomas E. (Department: 3745)
Power plants
Pressure fluid source and motor
Pulsator
C425S589000
Reexamination Certificate
active
07124581
ABSTRACT:
A drive mechanism for an injection molding machine has an output element that is moveable in a straight line and an electric motor drive unit having an electric motor and a piston-cylinder unit which has a first piston-cylinder unit in the force chain between the output element of the electric-motor drive unit and the movable component. A rapid actuating movement is possible and, the action of a high force is also achievable wherein a second piston-cylinder unit and a third piston-cylinder unit. A fluidic connection between the first cylinder chamber and the second cylinder chamber is controllable via a valve. When the valve is open, the second hydraulic piston displaces pressurized liquid from the second cylinder chamber into the first cylinder chamber, to actuate the movable component and, when the valve is closed, the third hydraulic piston displaces pressurized liquid from the third cylinder chamber into the first cylinder chamber to exert a high force on the movable component.
REFERENCES:
patent: 4030299 (1977-06-01), Reuschel et al.
patent: 5129806 (1992-07-01), Hehl
patent: 5773050 (1998-06-01), Wohlrab
patent: 4111594 (1992-10-01), None
patent: 0342235 (1989-11-01), None
Bosch Rexroth AG
Farber Martin A.
Lazo Thomas E.
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