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

Claim 9:
10. The lifting device in accordance with claim 9, wherein, after the control of the luffing boom with respect to the main boom in the lowering direction for so long until a luffing boom tip has ground contact or has pivoted inwardly with respect to the main boom, the steps for placing down the boom system from an erected position further comprising:
controlling the main boom in the lowering direction and simultaneously controlling the luffing boom with respect to the main boom in the lifting direction so that a lowering of the connection region of the main boom and the luffing boom occurs; with
the control of the main boom in the lowering direction and simultaneous control of the luffing boom with respect to the main boom in the lifting direction taking place for so long until the main boom has ground contact.