| 摘要 |
<p>The invention relates to a safety device for an apparatus provided for lifting and lowering loads and comprising at least one column (1,10), an arm (2,11) attached to this column and means for moving said arm up and downwards, characterized in that said means act upon a rod (5) which slides telescopically in a hollow tube (6) or upon a hollow rod (8) which slides around a loose rod (9) in order to lift said arm (2, 11) and to lower it so that when said arm (2, 11) is held back, the rod (5) and the hollow tube (6), and the hollow rod (8) and the loose rod (9), can slide with respect to one another. <IMAGE></p> |
