20130098241 | A TELESCOPIC HYDRAULIC CYLINDER - The invention concerns a telescopic hydraulic cylinder, comprising an inner cylindrical tube and an outer cylindrical tube located concentrically about the inner cylindrical tube, and a guide ring for guiding the inner and outer cylindrical tubes, the guide ring has a cylindrical support surface with a centre line and a guide surface and is mounted in a cylindrical groove. The guide surface slides along the inner surface of the outer cylindrical tube or the outer surface of the inner cylindrical tube. | 04-25-2013 |