| 摘要 |
The device comprises an element 20 which is transverse to the structure 10, two articulations 30 which are equidistant from the ends and two rigid arm-shaped components 40 which are secured thereto. The median part of the element between the articulations is flexible, capable of moving and bent so that its centre of curvature always remains on the same side of the element, the axes of the articulations are at a given distance from the element and on the side opposite that of the centre of curvature and the arms carry the articulations and are practically horizontal at rest. <IMAGE>
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