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US 11,577,941 B2Granted
Crane with adjustable suspended ballast
AssigneeLiebherr-Werk Ehingen GmbH
InventorsStefan Windbacher, Ulrich Wiedemann, Julian Wehrstedt, Roland Bohnacker
Life of this patent
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Abstract
The present invention relates to a crane comprising a main boom and a rearwardly directed derrick boom for bracing the main boom, wherein a suspended ballast is directly or indirectly attached to the derrick head via connecting means, wherein at least one luffable, rearwardly aligned ballast adjusting boom is provided, which acts on the connecting means and influences the suspended ballast radius by its luffing angle.
Claims4
A crane, comprising
- a main boom,
- a rearwardly directed derrick boom for bracing the main boom,
- a suspended ballast is directly or indirectly attached to a derrick head,
- connecting means attaching the suspended ballast to the derrick head, and
- a luffable, rearwardly aligned ballast adjusting boom directly coupled to the connecting means at a point between the derrick head and the suspended ballast, and which acts on the connecting means and influences a suspended ballast radius by a luffing angle thereof, wherein
- said connecting means comprise a first strand connecting a head of the ballast adjusting boom to the derrick head, and a second strand connecting the suspended ballast to the head of the ballast adjusting boom, and
- the connecting means comprise a first pulley block connecting the head of the ballast adjusting boom to the derrick head and a second pulley block connecting the suspended ballast to the head of the ballast adjusting boom.
4 more elements
Dependencies are inferred from the claim text.