Patent ID: 6375524
Filing Date: 2002-04-23
Classification: B63H

Abstract:
Vessel provided with a retractable thruster (5) that is mounted in a frame (6) which is displaceable in a shaft (2) in the hull of the vessel, which frame (6) is connected to a lifting device (3, 3â€²; 4, 4â€²; 12) for retracting the thruster in two stages, the lifting device in the first stage lifting the thruster to a level at or near the keel (7) of the vessel, the second stage comprising lifting the thruster (5) to an access level, located above the first level, characterised in that the shaft (2) of the vessel is provided with a rack (3, 3â€²), the lifting device comprising a pinion (4, 4â€²) movable along the rack (3, 3â€²), the pinion (4, 4â€²) being connected to the frame (6), wherein in the second stage the rack (3, 3â€²) can be extended by means of a separate rack extension means (12) which is attachable to the rack (3, 3â€²).