The invention relates to a system for controlling a load lifting device (1) with a controllable drive (2) and a lifting element (5) which is linked with the drive (2) and which is—at least in a non-operational position due to the gravitational force—vertically (Z—Z) aligned. A load receiving element...http://www.google.de/patents/US6974044?utm_source=gb-gplus-sharePatent US6974044 - System and device for controlling a load lifting device
