REVERSIBLE HYDRAULIC STEP DRIVE Russian patent published in 2008 - IPC F15B11/12 F15B13/16 F15B15/08 

FIELD: engines and pumps.

SUBSTANCE: drive is made up of two rigidly fixed hydraulic cylinders through which a flexible rod is passed made of closed structure cable. The flexible rod can be gripped in turns by pistons with controlled collets allowing the cable to move with the weight. The aforesaid pistons are forced by the working fluid fed in the cylinders by hydraulic control valves from the oil tank. The pistons accordant motion in the automatic reversible conditions is ensured by control signals sent from the hydraulic cylinders to the hydraulic control valves via the "AND" element.

EFFECT: expanded performances of drive.

2 dwg