| 摘要 |
PCT No. PCT/FR86/00214 Sec. 371 Date Dec. 4, 1986 Sec. 102(e) Date Dec. 4, 1986 PCT Filed Jun. 20, 1986 PCT Pub. No. WO86/07583 PCT Pub. Date Dec. 31, 1986.Driving apparatus operating in successive steps, comprising two clamping assemblies each having a set of clamping members for clamping a set of cables in alternate succession, and at least one hydraulic jack connected to at least one of the two clamping assemblies in order to cause axial displacement thereof, each clamping assembly comprising an auxiliary jack having a piston rod and a cylinder which is attached coaxially to one end of a tubular body of the corresponding clamping assembly and provided with longitudinal passageways for the cables, and coupling members for coupling the piston rod of the auxiliary jack to the set of clamping members of the corresponding clamping assembly, the coupling members being so constructed that all the clamping members of the set are free to move radially, but are caused by the piston rod to move simultaneously over the same distance of travel in the axial direction when the auxiliary jack is actuated.
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