| 摘要 |
The first link part (66) of the first frame-strut (22) is positioned between the support part (44) and the outer rim part (54) of the first frame strut. The bottom first frame strut (22) has a support part (44) for the sheets (26,28), parallel with which and spaced apart from, is a first link part (66) and a first outer rim part (54) facing away from the support part. A top second frame strut (24) has a pressure part (74) for pressing against the support part of the first frame-strut or sheets. A second link part (78) spaced apart from, and parallel with, the pressure part, has a second outer rim part (76) facing away from the pressure part. A spring arrangement (84) pretensions the two frame struts at least in a second swivel position.
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