| 摘要 |
A rotary plate (14) is mounted on an oblong bottom plate (12) in a manner which permits the former's longitudinal displacement. The bottom plate (12) features a number of transverse grooves (46) extending over its full width, between which grooves (46) are formed articulating webs (48) at the bottom and top face of the bottom plate (12) around which articulating webs (48) adjacent strips of the bottom plate (12) can be folded relative to each another. The bottom plate (12) forms in the area of the articulating webs (48) a multi-member belt or band with a sprung flat-shape recovery action. The rotary plate (14) features a central pin (36) which can be moved from a locked position into an unlocked position and vice versa. In the locked position, the pin (36) engages in a hole (30) of the bottom plate (12) to prevent the rotary plate (14) from further displacement. |
