| 摘要 |
The platform (C) is articulated on a transverse bar (4a) and is supported on a transverse bar (4b) of the. The uprights (2a,2b) extend without steps beyond the level of the platform to form a railing. They are connected in pairs by a transverse articulation between an angled hinge (12) integral with the upright (2b) and a hinge (9) at the top of the upright (2a). Each of the hinges carry an articulation (14) for the upper end of a connecting rod (15), the lower end (16) of which is on the platform.
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