| 摘要 |
The device has a retaining element (16) i.e. hollow shaft, at which a beam (10) is swivelably fixed. A coupling element (24) i.e. rotary ring, is swivelably supported around the retaining element independent of the beam. One side of the coupling element contacts the beam and other side of the coupling element contacts a stopper (30) provided at the retaining element for controlling rotation of beam around the retaining element more than 360 degree. The rotary ring is provided at the circumference with a window into which the stopper protrudes. |
