Systems, devices, and methods for providing a swinging system and platform assembly that deploys a swim platform from the front of a pontoon boat which is mounted underneath the deck between the pontoons in a raised position adjacent to the underside of the pontoon deck. The platform assembly, when deployed, provides a safe method for users of pontoon boat vessels to access the front deck area from land or from a body of water. The platform deploys from two pivoting frames affixed to the bottom of the deck, which is powered by an actuator with the push of a button on the control panel. For deployment, the platform is both lowered and extended out from the pontoon boat. A powered actuator positions the platform in the deployed position for use and then retracts the platform for storage.

A gangway assembly comprises a boom supporting at least one gangway which is pivotally connected to a first support at a fulcrum. A pivoting assembly is arranged below the gangway and comprises an electric motor-and-winch assembly, a sheave assembly, and one or more wires extending between the winch assembly and the sheave. An elevator assembly comprises a rail assembly on the column, and a plurality of wheels and an electric motor-and-winch assembly arranged on the second support below the gangway, and wires connected to respective fixtures at an upper end of the column.

A marine gangway has a tower adapted for attachment to a marine structure, rotatably about a tower rotational axis extending in a longitudinal direction of the tower. The tower has a tower aperture and at least one tower doorway arranged below and/or above the tower aperture where the tower aperture and the at least one tower doorway is adapted for people and/or goods to pass through. The marine gangway includes a gangway device comprising a gangway platform attached to the tower movably in the longitudinal direction of the tower, and a gangway rotatably attached to the gangway platform. The marine gangway further comprises a lift arranged inside the tower movable in the longitudinal direction of the tower. The lift has a lift doorway adapted to align with the tower aperture and with the at least one tower doorway as the lift moves in the longitudinal direction of the tower.

A marine vessel is for operating in a body of water. The marine vessel has a hull having a deck and a sidewall extending vertically upwardly relative to the deck, wherein together the sidewall and deck define an interior of the marine vessel. A dive door is pivotable about a vertical pivot axis into and between an open position opening a doorway through which a swimmer can exit the interior of the marine vessel and a closed position closing the doorway. A storage pocket is formed in an inside surface of the dive door facing the interior of the marine vessel. A retaining mechanism facilitates storage in and removal of a ladder from the storage pocket, the ladder being for enabling a swimmer to climb into or out of the body of water via the doorway when the dive door is in the open position.

A telescopic gangway, comprising a telescopable first and second gangway part, such as a telescoping boom and main boom. The first gangway part has a first walkboard, such as a first grating, and the second gangway part has a second walkboard, such as a second grating, that partially overlaps the first walkboard. The gangway further comprises an angled step unit providing a transition from the first walkboard to the second walkboard, such that the first walkboard, the second walkboard and the angled step unit form an assembled walkboard path. Here, the angled step unit has a first coupling unit, such as a comb plate, that is coupled to the first walkboard for allowing a movement in the longitudinal direction. The angled step unit has also a translating coupling unit that is coupled to the second walkboard, preferably for allowing a movement in a direction transverse to the longitudinal direction.

The present invention relates to a gangway system (1) for an offshore service vessel (N), suitable for the transfer of personnel between said service vessel and an offshore structure(S), in wave motion conditions.

The gangway system (1) comprises a telescopic corridor (7), which has an upstream section (71) and a downstream section (72), movable in translation relative to said upstream section (71).

The gangway system (1) further comprises means for maneuvering said gangway (5), in particular yaw maneuvering means (11), pitch maneuvering means (12) and translation maneuvering means (13).

The maneuvering means (10) cooperate with control means (15) so as to stabilize the downstream end (722) of the gangway (5) at, preferably resting on, said offshore structure(S).

A walk-to-work system for allowing personnel and/or equipment to move between a vessel and a wind turbine includes a gangway system and an elevator system positioned with a radial offset from the gangway system. The gangway system includes a height adjustable elongated pedestal and a gangway. The height adjustable elongated pedestal has a first elongated pedestal end mountable onto a deck of the vessel. The height adjustable elongated pedestal includes a first pedestal part and a second pedestal part height adjustably coupled to the first pedestal part. The gangway is rotationally coupled to the height adjustable elongated pedestal at a height H.sub.g from the first elongated pedestal end such that the gangway is radially extending at a length L.sub.g from a center axis of the height adjustable elongated pedestal. The elevator system includes a height adjustable elongated elevator having a first elevator end mountable onto the deck of the vessel. The height adjustable elevator includes a static elevator part and a displaceable elevator part height adjustably coupled to the static elevator part. The elevator system includes a drive system, an elevator car, and a lifting device. The drive system is configured to displace the displaceable elevator part relative to the static elevator part along the elevator's height. The elevator car is movably connected to the height adjustable elevator. The elevator car is configured to be elevated up to the same height as the gangway for allowing access between the elevator system and the gangway system. The lifting device is configured to move the elevator car of the height adjustable elevator.

The present application provides a 9-DOF wave compensation platform and operation method in marine engineering technology, comprising a 6-DOF parallel stabilization platform and a 3-DOF tandem boarding bridge. The 6-DOF parallel stabilization platform comprises a mounting base and a movable platform. Motion branch chains are arranged between the mounting base and the movable platform. The motion branch chain moves actively driven by a driving element, and a balancing cylinder system is further connected to the motion branch chain to offset the deadweight of the equipment. The 3-DOF tandem boarding bridge is installed on the movable platform. Through the balancing cylinder system, the driving load generated by component weight in the 9-DOF wave compensation platform is counterbalanced in advance, so that the driving load of the compensation platform during operation is significantly reduced, with lower total energy consumption of the system, and wider range of selectable driving elements.

A cassette assembly is disclosed attachable to an end portion of a waterborne vessel and including a cassette section to bear against an external structure in use. The cassette section is movable relative to the vessel in a direction towards an opposite end of the vessel. A resilient buffer system counters movement of the cassette section when the vessel is moved towards the external structure, wherein the resilient buffer system includes a buffer including a plurality of resiliently compressible elements arranged in series. A waterborne vessel includes a receiving portion for receiving the cassette assembly, and can be used to service a water-accessible structure such as a wind turbine.

A telescopic gangway, comprising a main gangway part and a telescoping gangway part that is telescopable with respect to the main gangway in a longitudinal direction. The gangway comprises a hoisting mechanism provided with a telescoping decoupling mechanism for compensating a variation of the wire end portion length caused by a telescoping movement of the telescoping gangway.