Mechanical device for, e.g. window covering, has form rod whose end is moved such that portion of form rod forming boundary is larger/smaller based on linear guide adjustment angle and radius of aperture is made larger/smaller

摘要

The device (1) has rod-shaped linear guides (2) which are arranged at annular support element (3), and set around an axis of aperture (4). The linear guides comprise drive rods (21) with ends (211,212) and form rods (22) with ends (221,222), which surround a portion of aperture. The guides are adjusted simultaneously by the same adjustment angle. The end (222) of each form rod seen in primary rotational direction is moved such that portion of the form rod forming a boundary is larger or smaller based on adjustment angle and radius of aperture is made larger or smaller.