Work cylinder unit (50), in particular hydraulic cylinder unit (50), with -.multi-stage training per telescope stage (50.1, 50.2)-a cylinder (21, 21.1, 21.2) with a cylinder floor (21c) at the rear end and a ring-shaped seal unit (5, 5.1, 5.2) mounted at the front, open end of the cylinder interior (21a) in the particularly circular opening,A piston rod (5, 5.1, 5.2) which can be passed axially (22, 22.1, 22.2) through a section of its length axially outwards from the cylinder (21, 21.1, 21.2) and whose outer surface (22a) is formed as a smooth piston sealing surface (22a) and at the rod sealing unit (5) employment,a pressure chamber (1), which has a pressure room connection (1a), which is densely sealable (21, 21.1, 21.2) between the rod sealing unit (5), the piston rod (22, 22.1, 22.2) and the cylinder (21, 21.1, 21.2),a mechanical position securing (4) for the axial position of the piston rod (22, 22') in relation to the cylinder (21, 21.1, 21.2) by means of interlocking securing elements (4a, b), characterized by:at least one piston side fuse (4a) is axially fixed in the rear of the piston rod (22, 22.1, 22.2); andAt least one cylindrical safety element (4b) in axial direction (10) is positioned several times consecutively on or in the cylinder's inner perimeter (21a) (21, 21.1, 21.2) axially away from the rod sealing unit (5).(locking position securing)
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