Device for increasing pressure in cylinders with control unit

Details Device for increasing pressure in cylinders with control unit Device for increasing pressure in cylinders with control unit

2007-12-13

2010-10-12

Leslie, Michael (Department: 3745)

Motors: expansible chamber type

Relatively movable working members with one having motive...

C060S563000

Reexamination Certificate

active

07810424

ABSTRACT:
In order to increase the pressure of the hydraulic medium in cylinders, especially those of the hydraulic longwall construction used in underground mining and tunnel construction, a control unit21is used which has suitably controllable, releasable check valves29, 30and25, as well as a blockable check valve31. These check valves and the associated directional valves create the possibility of filling both the cylinder space20proper and the piston rod cavity26, which enables the pressure adjustment process with hydraulic medium in a specific manner, or accordingly their discharge, with no risk of reciprocal influence, seizing, or other damage.

REFERENCES:
patent: 4465408 (1984-08-01), Krieger et al.
patent: 4798417 (1989-01-01), Blumenthal et al.
patent: 7424803 (2008-09-01), Voss
patent: 10306128 (2004-08-01), None

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