| 摘要 |
It includes a trough-shaped piece (1) which is open laterally and a shoe (7) articulated to a lever (5) which rocks with respect to a cheek (2) of the trough-shaped piece (1) and which is associated pivotably with a locking finger (9) interacting with a stop notch (2-) for determining the normal position of the shoe (7) during work, that is to say in such a relationship vis-à-vis the trough-shaped piece (1) that the funicular member (3) remains free but trapped between the latter and the shoe (7), whilst, if the user falls, the finger (9) is unlocked and the lever (5) pivots so that the funicular member (3) is clamped between the shoe (7) and the trough-shaped piece (1). <IMAGE>
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