Land vehicles – Wheeled – Running gear
Reexamination Certificate
2008-03-11
2008-03-11
Culbreth, Eric (Department: 3616)
Land vehicles
Wheeled
Running gear
C280S124160, C280S124161
Reexamination Certificate
active
10519784
ABSTRACT:
A hydropneumatic suspension having at least one suspension cylinder (10) and at least one hydraulic accumulator configured as a suspension accumulator (18) has a pilot-actuated valve (20) for opening or blocking a fluid-carrying connection between the suspension cylinder (10) and the suspension accumulator (18). The pilot-actuated valve (20) can be moved into the blocked position by a hydraulic actuating assembly (22). The hydraulic actuating assembly (22) taps the fluid pressure between suspension accumulator (18) and the suspension cylinder (10), and forwards it by a switching valve (24) to an operating side (26) of the pilot-actuated valve (20) through a pilot-actuated line (38). Another proportional valve (50), or such valve connected to the respective associated pilot-actuated line (38), can be between one switching valve (24) and the pilot-actuated valve (20).
REFERENCES:
patent: 3761110 (1973-09-01), Grosseau
patent: 37 42 883 (1989-07-01), None
patent: 42 42 448 (1994-03-01), None
Kuhn Michael
Schmidt Hubertus
Culbreth Eric
Hydac System GmbH
Roylance Abrams Berdo & Goodman L.L.P.
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