| 摘要 |
A frame collapsible and extendable by means of a turning movement, which frame comprises a number of supporting frames (1) and a number of rod-like upright elements (2, 2'), each upright element being connected to a supporting frame via a pivot (3) for pivoting through at least 90 DEG and being connected to at least one end via a hinge joint (4) and to one end of a further upright element connected to a further supporting frame for swinging and turning about its longitudinal axis, in such a manner that in a first collapsed position the supporting frames form a compact stack with upright elements and in a second extended position the supporting frames are spaced with the upright elements mutually resting on each other surface-to-surface as positioning means, while a spring force in the hinge joint must be overcome to bring the frame out of the extended position.
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