An operating cylinder device including at least one multistage telescoping operating cylinder unit, in particular a hydraulic cylinder unit, comprising per telescope stage (50.1, 50.2): - a cylinder (21, 21') including a cylinder base at a rear end and an annular rod seal unit that is attached in a particularly circular opening at an open front end of a cylinder cavity, - a piston rod (22, 22') that is axially moveable and sealed tight though the rod seal unit and which protrudes in outward direction over a portion of its length axially forward out of the cylinder (21, 21) and whose outer circumferential surface is configured as a smooth piston seal surface and contacts the rod seal unit, - a first pressure cavity (1, 1') that is thus formed and sealable tight in an interior of the cylinder (21, 21') between the rod seal unit, the piston rod (22, 22') and the cylinder (21, 21') and which includes a first pressure cavity connection (1a, 1'a), - a mechanical position safety for an axial position of the piston rod (22, 22') relative to the cylinder (21, 21') by cooperating safety elements (4a, b) with interlocking protrusions which penetrate interlocking recesses, whereby - at least one piston side safety element is arranged in a rear portion of the piston rod (22, 22'), and - at least one cylinder side safety element is arranged in the axial direction in series at or in an inner circumferential surface of the cylinder (21, 21') axially remote from the rod seal unit, - the interlocking protrusions are arranged at an outer circumference of the piston rod and the interlocking recesses are arranged at an inner circumference of the cylinder, - the at least one piston side interlocking protrusion is arranged in the first pressure cavity (1, 1'), - a support protrusion (4a3) protrudes radially inward from a radial inner surface of each piston side interlocking protrusion and is supported in a support recess in a radial direction sealed tight so that a freely accessible radial inner face of the support protrusion (4a3) is not directly connected with the first pressure cavity (1, 1"), - a supply cavity is provided in the interior of the piston rod (22, 22'), in particular of the piston end piece, and - the at least one, in particular all, support recesses are connected with the supply cavity forming a second pressure cavity (2, 2'), - the second pressure cavity (2, 2) is connected with a second pressure cavity connection (2a, 2'a) in the outer surface of the surrounding cylinder (21, 21') through a connection cavity. - a cylinder (21, 21') including a cylinder base at a rear end and an annular rod seal unit that is attached in a particularly circular opening at an open front end of a cylinder cavity, - a piston rod (22, 22') that is axially moveable and sealed tight though the rod seal unit and which protrudes in outward direction over a portion of its length axially forward out of the cylinder (21, 21) and whose outer circumferential surface is configured as a smooth piston seal surface and contacts the rod seal unit, - a first pressure cavity (1, 1') that is thus formed and sealable tight in an interior of the cylinder (21, 21') between the rod seal unit, the piston rod (22, 22') and the cylinder (21, 21') and which includes a first pressure cavity connection (1a, 1'a), - a mechanical position safety for an axial position of the piston rod (22, 22') relative to the cylinder (21, 21') by cooperating safety elements (4a, b) with interlocking protrusions which penetrate interlocking recesses, - at least one piston side safety element is arranged in a rear portion of the piston rod (22, 22'), and - at least one cylinder side safety element is arranged in the axial direction in series at or in an inner circumferential surface of the cylinder (21, 21') axially remote from the rod seal unit, - the interlocking protrusions are arranged at an outer circumference of the piston rod and the interlocking recesses are arranged at an inner circumference of the cylinder, - the at least one piston side interlocking protrusion is arranged in the first pressure cavity (1, 1'), - a support protrusion (4a3) protrudes radially inward from a radial inner surface of each piston side interlocking protrusion and is supported in a support recess in a radial direction sealed tight so that a freely accessible radial inner face of the support protrusion (4a3) is not directly connected with the first pressure cavity (1, 1"), - a supply cavity is provided in the interior of the piston rod (22, 22'), in particular of the piston end piece, and - the at least one, in particular all, support recesses are connected with the supply cavity forming a second pressure cavity (2, 2'), - the second pressure cavity (2, 2) is connected with a second pressure cavity connection (2a, 2'a) in the outer surface of the surrounding cylinder (21, 21') through a connection cavity.