| 摘要 |
<p>The hydraulic lifting device has a reservoir, pump and selector assembly (1) connected to a single or double acting jack for a vehicle cab. The jack has an anti-fall device and is fed by its piston rod (4) and the safety device (6) is in the rod also. There is a differential hydraulic uncoupling for the jack obtained by connecting the two feed pipes (41,42) at the level of the jack piston at the end of the stroke with the piston rod withdrawn. The selector is a ball (3) held on one of the two seats (31,32) of a distribution pipe.</p> |
