O&k Orenstein & Koppel Aktiengesellschaft

O & K Orenstein

Koppel Aktiengesellschraft

Walter Kolb

Gustav Leidinger

Gunter Hilmer

Gunter Bronner

Gunther Proll

Guenter Broenner

Process for actuating the steering cylinders of mobile plant and

Method of controlling the positioning of an outfit tilting cylinder

Hydraulic vibration damping system for machines provided with tools

In a hydraulically operated multiport valve having a floating position for connecting the cylinder chambers of a hydraulic piston-cylinder drive, a valve slide and a restraining piston associated with it are provided. By means of a respective dimensioning of the surface of both the part of the valve slide which can be charged with control pressure for attaining the floating position and of the restraining piston, a displacement of the restraining piston against the maximum pressure present in its control chamber becomes possible.

Multiport valve

A grader has a grader blade which can be pressed against the ground or lifted off it by means of piston-cylinder drives. To be able to vary the downard pressure of the grader blade in its float position, either the piston chamber or the piston ring chamber of each drive can be charged with a working fluid under pressure when the grader blade is in the float position, so that the corresponding drive exerts a force on the grader blade which increases or decreases the downward pressure of the grader blade on the ground. While still allowing the grader blue to follow the contour of the ground.

Grader blade having a pressurized float position

Growing community of inventors

Augsburg, Germany

Walter Kolb