| 摘要 |
These improvements consist in replacing the cylinder for actuating the pressure device 5 by a mechanical device which consists of a nut 17 integral with the pressure device in question and a screw 19 actuated by a motor 20. The nut 17 is guided by a cylindrical sleeve 16 located in a casing 15 which contains this device, to which casing is also connected the screw 19, beyond the nut 17, via the axial and radial rolling means, the drive motor 20 of the screw 19 being located in the cover 19 of the casing 15. <IMAGE>
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