Patent ID: 11858783
Assignee: REEL
Field: Handling (Mechanical engineering)
Classification: CPC B | IPC B

Claim 0:
1. A knuckle boom crane for offshore application, the knuckle boom crane comprising:
a crane house;
a knuckle boom carried by said crane house, the knuckle boom comprising a main boom and a jib, in series, the main boom and the jib each including an upstream end and a downstream end;
an operating system configured to operate said crane house and said knuckle boom; and
a controller including a computer, the controller being configured to pilot said operating system by active compensation by taking into account data coming from a motion reference system, to stabilize the downstream end of the jib,
wherein said crane house comprises a slewing knuckle configured to define a slewing motion of the knuckle boom about a slewing axis,
said crane house and said upstream end of the main boom cooperate through an upstream knuckle to define a luffing motion of said main boom about an upstream knuckle axis,
said downstream end of the main boom and said upstream end of the jib cooperate through a downstream knuckle to define a folding motion of said jib about a downstream knuckle axis,
said operating system comprises:
at least one slewing actuator configured to generate the slewing motion of said knuckle boom,
at least one first linear actuator configured to generate said luffing motion of said main boom, and
at least one second linear actuator configured to generate said folding motion of said jib, said at least one second linear actuator being connected to said crane house and said jib, said at least one second linear actuator being connected to said jib through a mechanical transmission system, said at least one second linear actuator having an upstream end assembled directly with the crane house and a downstream end assembled with the jib through the mechanical transmission system.