| 摘要 |
A vertical support (4) is mounted on a foot (1). Grids (5) are attached one above the other to this support (4) and are pivotable out of their horizontal working position into a vertical position of rest. Each grid (5) has a middle part (50) which is designed as an equal-armed lever and which forms two part grids and serves as a pivot axis. If appropriate, each middle part (50) can additionally be pivoted relative to the support (4) about a point of articulation (45). <IMAGE>
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