| 摘要 |
A cylinder-piston combination driven by a pressure medium, said combination being comprised of a cylinder (3) whose interior houses an elongated cylinder barrel, a dual-element piston assembly (1, 2) adapted movable in opposite direction in the axial direction of the cylinder barrel, and the piston rod of the outer piston (1) of said piston assembly having a tubular structure and said piston (1) being sealed against the inner surface of the cylinder (3) and the inner piston (2) of said piston assembly being appropriately dimensioned to be able to enter the bore of the tubular piston rod of the piston (1) and to be movable in respect to said piston rod, and said combination further incorporating a piston element (6) which is adapted to fit about the piston rod of the inner piston (2) and is sealed against and is capable of sliding along said piston rod of the inner piston and is sealed against said inner surface of the cylinder (3), and said cylinder (3) having appropriate connection ports (4, 8, 14, 20) for routing the pressure medium into the cylinder and out thereof. The piston element (6) is provided with elements (10, 11, 13) for locking said piston element disengageably to the inner piston (2), and the inner piston (2) is provided with channels (22) for routing the pressure medium entering via the port (4) to the interior of the outer piston (1), and at least one end of the cylinder (3) is provided with elements (15, 16, 17, 18) for locking at least one of the piston rods of the pistons (1, 2) in place. |
