Patent ID: 6382080
Filing Date: 2002-05-07
Classification: F15B

Abstract:
An apparatus for the synchronization of a telescopic ram mounted in a hydraulic elevator shaft of a building, the telescopic ram having relatively movable portions including at least two concentric pistons in a cylinder, the pistons and the cylinder being movably slidable-relative to one another, the apparatus comprising:a connecting means adapted to be fixed at one end to the building and at an opposite end to one of the movable portions of the ram and deflected over at least one deflecting roller mounted to another of the movable portions of the ram, said connecting means being formed as a sheathed synthetic fiber cable; and said at least one deflecting roller having a diameter in a range of 10 to 17 times a diameter of said cable, said cable extending partially about said one deflecting roller, whereby when said one deflecting roller is mounted on the another movable portion of the telescopic ram, said one end of said cable is attached to the building and said opposite end of said cable is attached to the one movable portion of the ram, said connecting means causes the one movable portion and the another movable portion to move synchronously as the ram is extended and retracted.