Patent ID: 11965478
Assignee: DEME OFFSHORE BE N.V.
Field: Handling (Mechanical engineering)
Classification: CPC B  F  Y | IPC B  F

Claim 10:
11. Method for lifting an object from a deck of a vessel subject to movements in a heave direction, the method comprising:
positioning the object to be lifted on a support surface for the object provided at a first height in the heave direction relative to the deck;
taking up the object with a lifting crane from the support surface at a lifting point thereof at a lifting speed; and
activating an actuator system to lower the support surface relative to the deck
at an instant in time at which the object is lifted from the support surface to a second height in the heave direction at a lowering speed, the method further comprising:
determining the instant in time at which the object is lifted from the surface by a detector, wherein the detector comprises a force sensor located in the support surface,
wherein the actuator system comprises a distance-varying means provided between the support surface and a base surface,
wherein the distance-varying means is configured to vary a distance in the heave direction between the support surface and the base surface, and
wherein the distance-varying means each have a longitudinal axis and the longitudinal axis of some distance-varying means extend in the heave direction, whereas the longitudinal axis of other distance-varying means extend at a non-zero acute angle with the heave direction.