| 摘要 |
A telescopic extraction arm (1), having an outer tube (4) and an inner tube (6) displaceably and rotatably fitted therein. Via balancing rings (14, 16) fixed on each tube respectively, which are kept a pre-determinable distance apart by a stop member (18) arranged in the outer tube (4), the tubes can be easily displaced and locked in relation to one another with a negligible degree of the "drawer effect" occurring in conventional telescopic arrangements. |
