| 摘要 |
A resilient clamp (15) is provided which has the general shape of a dish or of a bell, and which is provided with radial slots (18) in its peripheral part and a central solid annular part. Structure is provide (21) for centering the clamp (15) with respect to the driving shaft (2). The lateral segments of this clamp (15) move radially with respect to the axis of the clamp when the central part (16) thereof is moved along this axis.
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