| 摘要 |
The device has rigid structures i.e. telescopic bars (7, 10, 12), placed opposite to a bay. Two arms (15), which are connected to an upper part of the structures, are supported against a wall, above the bay and at both sides of the bay. The arms are spaced from one another, and a hollow part (11) is fixed at the top of the arms. An anchoring point i.e. anchoring ring (16), is integrated to the structures and is situated at the upper part of the structures. |
