| 摘要 |
The shaft (2) widens out conically towards its free end (3) and is enclosed in a sleeve (5) movable along the tie-bolt bar. Cutter tabs (6) on the sleeve are separated by axial slits (7) and extend towards the cone from a plastics link (9). The free front ends of the cutter-tabs have blades (10). The cutter-tabs are placed radially by the sleeve being slid axially onto the cone. The free front end of the sleeve has an axial fold round it near the cutter-tabs. The axial length (l) of the folded parts (8) corresponds to the length of the axial slits. The plastics link is positioned in the transition between the folded parts and the sleeve casing.
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