| 摘要 |
The present invention concerns an improved expanding shaft (1) comprising: a cylindrical shaft (2) provided with radial slots (3, 4, 5) carried out along its generating lines and suitable for sustaining one or more tubular supports (8) coupled outside it; a plurality of mobile sectors (31, 41, 51), introduced in said slots (3, 4, 5) and expanding radially through thrusting means (6). At least one (51) of said mobile sectors (31, 41, 51) is provided with two or more sliding bucking elements (7), suitable for locking said tubular supports axially.
|
