Height-adjustment device for vertical adjustment of e.g. sofa, has screw ranging displaced along longitudinal direction of lifting scissors, and electromotive drive displacing back and forth of screw ranging

摘要

The device (2) has a lifting frame (4) vertically arranged opposite to a base frame (3). Two lifting scissors are supported on a seat surface and a lying surface of the lifting frame opposite to the base frame and opened and closed against swingable legs (11, 13). The lifting scissors raise the lifting frame opposite to the base frame while opening the lifting frame opposite to the base frame. A screw ranging (7) is displaced along longitudinal direction of the lifting scissors. An electromotive drive (9) displaces back and forth of the screw ranging along longitudinal direction.