| 摘要 |
The machine is noteworthy, on the one hand, in that a rotation head 14, capable of receiving a tool in order to make it rotate, is mounted to slide along the mast 10, being brought under control by means of hydraulic control so as to be moved upwards to ensure that the tool is progressively driven in, and on the other hand in that a ram 16 is mounted to slide along the mast 10, the said ram being connected to a winch 17 fixed in the upper part of the mast and subjected to means of control to ensure that the ram rises and falls automatically, according to different heights. <IMAGE>
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