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US 7,441,670 B2Granted
Derrick crane
AssigneeLiebherr-Werk Ehingen GmbH
InventorHans-Dieter Willim
Life of this patent
Estimating the term…
Abstract
The invention relates to a derrick crane having a main boom and having a derrick boom which are connected to one another by a stay cable to guy the main boom, having an auxiliary tip adjoining the main boom and a stay cable for its guying. In accordance with the invention, the stay cable of the auxiliary tip engages at the auxiliary tip at the one end and at the stay cable of the main boom at the other end.
Claims18
A derrick crane having
- a main boom (10),
- an auxiliary boom (40) connected to a tip of the main boom (10) at a joint therebetween, said auxiliary boom (40) having a portion at which a lifting cable is disposed,
- a derrick boom (20),
- a stay cable assembly (30) to guy the main boom (10), said stay cable assembly (30) being attached at a first connection point to the main boom (10) and at a second connection point to the derrick boom (20) without boom strut(s) in the stay cable assembly (30) between said first and second connection points,
- a first auxiliary stay cable (50) attached to the auxiliary boom (40) and extending from the auxiliary boom (40) to the stay cable assembly (30) wherein the first auxiliary stay cable (50) is attached to and terminates at the stay cable assembly (30) at a connection point of the first auxiliary stay cable (50) between first and second ends of the stay cable assembly (30), and
- an additional auxiliary stay cable (60) being provided between the connection point of the first auxiliary stay cable (50) on stay cable assembly (30) and the main boom (10).
3 more elements
A derrick crane having:
- a main boom (10) having an auxiliary tip (40) adjoining the main boom (10), said auxiliary tip (40) having a portion at which the a lifting cable is disposed,
- a derrick boom (20),
- a stay cable assembly (30) to guy the main boom (10), said stay cable assembly being attached at a first end to the main boom (10) and at a second end to the derrick boom (20),
- an auxiliary stay cable (50) extending from the auxiliary tip (40) to the stay cable assembly (30), wherein the auxiliary stay cable (50) is attached to the stay cable (30) at a connection point between the first and second ends of the stay cable assembly (30), and
- an additional auxiliary stay cable (60) being provided between the connection point of the auxiliary stay cable (50) and the stay cable assembly (30) and the main boom (10).
2 more elements
Dependencies are inferred from the claim text.