Patent ID: 8312618

Claim:
A module system for manufacturing two and three stable position fluid-operated actuators, the two stable position actuator comprising a first piston enclosed by a cylinder housing, where the first piston is fixedly connected to a piston rod that extends axially out through at least one of the cylinder housing and at least one cover in one of two ends of the cylinder housing, at least a first and a second pressure duct in the cylinder housing through which at least two pressure chambers, that are separated by the first piston, can selectively be set in fluid connection with a pressure supply or ambient pressure by valves, and the three stable position actuator comprising all above mentioned corresponding elements for the two stable position actuator plus a main piston and a breathing duct, the elements forming together two pressure chambers and a non-pressurized intermediate chamber, the chambers being separated by the main piston and a ring piston, which ring piston corresponds to the first piston, and where the cylinder housing of the both variants of two and three stable positions actuators are manufactured from a blank, wherein the blank comprises at least one opening for the cover and is identical for the variants of the two and three stable position actuators, and is at least prepared for the arrangement of the first pressure duct, the second pressure duct and a first cylinder diameter of the cylinder housing, wherein in the variants: the cylinder housing, the first piston and an outer sealing device for substantially axial motion compose an outer cylinder-piston system at the first cylinder diameter, and there is at least a first static sealing device between the cylinder housing and the at least one cover.