DRIVE WITHOUT ROD Russian patent published in 1996 - IPC

FIELD: pneumatics. SUBSTANCE: drive has air cylinder with a piston having permanent magnets and movable carriage (ring) with permanent magnets, mounted on the outer side of the air cylinder for permitting movement along its axis. The piston is provided with additional cylinder with piston having permanent magnets. The additional cylinder is coaxially mounted inside the air cylinder and rigidly secured to it. The spaces of the additional cylinder on both sides of the piston are filled with fluid and interconnected through a pipe line with a throttle and check valves and hydraulic distributor. The piston of the air cylinder is ring-shaped. EFFECT: improved design. 1 dwg