| 摘要 |
The invention relates to a tubular ice piton (10) comprising a head (16) with an attaching tab (18), and a helical, self-tapping screw thread (36) ending in a trepan (32) with cutting teeth (34). To facilitate penetration of the piton into the ice and to reinforce its anchoring at the end of its driving travel, the transverse section of the screw thread (36) increases in the direction of the trepan (32) so as to form a relief angle A of between one and ten degrees with the longitudinal direction of the axis (14) of the tube (12). <IMAGE>
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