| 摘要 |
A frame which can be moved between a folded-in position and a folded-out position is provided with suspension means intended for suspending the frame from a vertical element, an arm assembly comprising at least three arms and a rod assembly which cooperates with the arm assembly, which assemblies are designed such that the arms extend substantially in the same direction in the folded-in position at a relatively small distance next to one another and occupy a relatively small area in a direction transverse thereto, and in the folded-out position occupy a relatively large area in a direction transverse thereto. The suspension means cooperate with a section of the arm assembly and/or with a section of the rod assembly which is/are at the periphery of the planes defined by the assemblies.
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