Patent ID: 11912542
Assignee: LIEBHERR-WERK NENZING GMBH
Field: Handling (Mechanical engineering)
Classification: CPC B | IPC B

Claim 8:
9. The lifting device in accordance with claim 8, wherein the steps for erecting the boom system from an erected position comprise:
controlling the luffing boom with respect to the main boom in the lowering direction, with, as soon as the tilting moment detected by the tilting moment detection unit exceeds a threshold value, a control of the main boom in the lifting direction first taking place;
as soon as the control of the luffing boom with respect to the main boom in the lowering direction has a result that the luffing boom has passed through the horizontal, controlling the luffing boom with respect to the main boom in the lowering direction simultaneously with a control of the main boom in the lowering direction, provided that the tilting moment detected by the tilting moment detection unit does not exceed a threshold value.