Control device

Power plants – Pressure fluid source and motor – Having plural energy outputs

Reexamination Certificate

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Details

C091S445000

Reexamination Certificate

active

07409828

ABSTRACT:
Control device1having a changeover valve5, a pump4delivering operating medium, in particular a motor-operated pump or a hand pump, connection devices for connecting the control device1to at least two tools, in particular a first lifting cylinder2and a second lifting cylinder3or the like, the changeover valve5being operable in particular by hand; whereina) the changeover valve5, when the operator lets go of it, can be brought automatically into a basic position in which no pressure build-up in the region of the tools is possible,b) a control valve7is provided between the changeover valve5and the tools, andc) the control valve7can likewise be operated by hand by an operator.

REFERENCES:
patent: 5152312 (1992-10-01), Kogel
patent: 5497805 (1996-03-01), Sunamura et al.
patent: 5727442 (1998-03-01), Wimmer
patent: 2019052 (1970-04-01), None
patent: 1347023 (1971-04-01), None
patent: 2263772 (1974-07-01), None
patent: 694 25 539 (2001-04-01), None
patent: 0 649 988 (2000-08-01), None
patent: 2340486 (2000-02-01), None
Patent Office of the People's Republic of China, Notification of Second Office Action, Dec. 14, 2007, China.
Jihai, Jiang, Jinchun, Song and Changshi, Gao, “Hydraulics and Pneumatics”, pp. 138-141; Edition 1, Jan. 2002.

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