Lifting device, e.g. for an electric table or bed, with a double-threaded rod links to pushing units interconnected so as to control relative pushing movements between them

摘要

A drive device (10) has a fixed link to the bottom end of a first pushing unit. A first transmission device (20) has a first threaded rod (21) linked to the drive device. A telescopic tube structure (23) links to the first threaded rod regarding its thread and moves linearly in relation to the first threaded rod driven by the drive device.