| 摘要 |
In the grid raised position, between arms (3,4) and parallel to a support long part (2), two ars (5,10) are so arranged at different heights that they can be brought into a lower position characterising the grid collapsed format. The bars have, at their two ends in the grid assembled position, downwardly pointing arms (6,9), and in this position the arms of the upper bar are longer than those of the lower bar. The bars are (via their arms) pivotably located at a location point (7,8) on the support arms around axes parallel with the long part of the support (1). In the assembled state, the pivot axis of the upper bar is higher than that of the lower bar, so that when the support and bars are pivoted downwards to the collapsed state they locate relatively tightly one over the other in a vertical plane. |
