Adjustment device has ring, elements that contact adjacent ones at two or more peripheral points when between first and second positions, along their circumference in second position

摘要

The device has a ring (2), essentially two-dimensional elements (3) movable in a plane between first and second positions and rotatably mounted on the ring via axle parts (4) and a force transfer device (19) that transfers the movement of one element synchronously to all elements via the axle parts. The elements contact adjacent elements at two or more peripheral points (15,16) when between the first and second positions and along their circumference when in the essentially radial second position.