| 摘要 |
Safety device for cranes, pylons or the like in which there is provided a vertical ladder (6) allowing access to be gained to the upper part, the said device comprising a cable (74) guided along the ladder and provided with means intended to be connected to the person using the ladder, the said cable being guided over a series of pulleys and including a counter weight for lightening the weight of the person using the ladder, characterised in that one of the pulleys (75) includes means for locking it when its rotational speed exceeds a predetermined threshold. <IMAGE>
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