| 摘要 |
A telescopic support (10), particularly for building use, comprises at least two tubular elements, that is, an outer element (12) and an inner element (11), slidable telescopically one inside the other, and clamping means (20) for locking the relative sliding of the elements in at least one of the directions of sliding. The inner element (11) has, in cross-section, a series of recurring corrugations extending substantially continuously longitudinally and distributed at regular intervals around its circumference.
|
