摘要 |
It comprises an elongate hollow body 1 having two transverse stops 14, 15 spaced apart in the longitudinal direction between which a mass 13 is mounted to slide freely so as to strike the stop 15 in the direction of driving a rod 17 into a corresponding hole, the elongate hollow body 1 containing, in a longitudinal hole 1A, a sheath 2 and the end parts 4, 5 of the hollow body 1 and of the sheath 2 being frustoconical and shaped into means for clamping the rod 17 to be driven in. <IMAGE>
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