| 摘要 |
It comprises two movable jaws 1A, 1B which rotate on a fixed element 2a of the chassis 2 of the vibration head and are connected together by a dual-acting cylinder 6 fixed to a portion of said jaws, the clamp being fixed to blocking means 10, 10A, 10B which make it possible to permanently stiffen the polygon P, P' delimited by the axes of the various articulations 3, 7, 8, 4A, 4B, 7, 8 of the jaws 1A, 1B of said clamp with respect to the clamp chassis 2, outside the phases of closing or opening said jaws. <IMAGE>
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