Power plants – Pressure fluid source and motor – Pulsator
Reexamination Certificate
2006-03-14
2006-03-14
Lazo, Thomas E. (Department: 3745)
Power plants
Pressure fluid source and motor
Pulsator
C060S563000, C425S463000
Reexamination Certificate
active
07010912
ABSTRACT:
A drive device has a drive element movable axially by means of an electric motor and a hydraulic unit. In the drive device it is important to execute a rapid adjusting movement and then to exert high forces. This causes high reaction forces on the lifting spindle. High reaction forces are avoided if a force intensifier with two pistons movable in relation to one another and differing from one another in the size of their active surfaces along with an intermediate part which, together with the pistons, encloses a pressure space filled with a pressure fluid is used, if the smaller active surface is connected mechanically to the drive element, for the adjusting movement, the hydraulic unit can be moved as a whole, and if, for exerting a high force by means of the larger active surface, the intermediate part can be blocked against displacement in relation to a fixed stand.
REFERENCES:
patent: 4030299 (1977-06-01), Reuschel et al.
patent: 5338174 (1994-08-01), Miese et al.
patent: 4111594 (1992-10-01), None
patent: 9211993 (1992-07-01), None
patent: 0189801 (2001-11-01), None
patent: 0211970 (2002-02-01), None
Bosch Rexroth AG
Farber Martin A.
Lazo Thomas E.
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