| 摘要 |
The present invention relates to a multi-blade tool, of longitudinal axis (yy'). This tool is characterised in that it includes, at its base, at least a first cutting blade having two cutting edges, namely a first cutting edge (17a), which extends transversely from the longitudinal axis yy' outwards, over a first given length (r), and a second cutting edge (17b) which extends longitudinally upwards, from the first cutting edge (17a), and at least a second cutting blade (29'), the cutting edge (29a, 29'a) of which extends longitudinally upwards, from the level of the cutting edge (17a) of the first cutting blade over a second given length, and which is distant from the longitudinal axis (yy') by a third given length (R) greater than the first given length (r). <IMAGE>
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