Crane

Details Crane Crane

2006-07-14

2009-02-17

Brahan, Thomas J. (Department: 3654)

Traversing hoists

Ship mounted or floating

Including counterweight or means to compensate for list,...

C212S278000

Reexamination Certificate

active

07490728

ABSTRACT:
A crane, in particular to an offshore crane, having a hoist rope winch, a hydraulic hoist winch drive and an overload protection which is connected to the hoist winch drive and which, when a predetermined permitted limit load is reached, permits a drawing off of the hoist rope from the hoist rope winch under a predetermined variable restoring force dependent on the radius and/or the permitted working load of the crane. A decoupling of the hoist winch drive and thus a mechanical separation of the powertrain between the hoist rope winch and the hoist winch drive is therefore dispensed with and instead the retention force varying in dependence on the radius and/or the respectively permitted working load of the crane is provided by the hoist rope winch drive motor.

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