Ships – Mother ship – floating landing platform – and harbor – Vessel carrier
Patent
1985-08-20
1987-05-05
Basinger, Sherman D.
Ships
Mother ship, floating landing platform, and harbor
Vessel carrier
114312, 414626, 2941194, 212147, B63B 3540
Patent
active
046623000
DESCRIPTION:
BRIEF SUMMARY
This invention relates to an offshoreload-handling system and is primarily concerned with a ship-board handling system for a submersible.
In a known ship-board load-handling system for a submersible there is provided a hydraulically operated A-frame on which is swingably hung a winch head carrying a winch and from which head is suspended by hydraulic rams, a frame interconnected with the head by a telescopic leg for linear guidance of the frame relative to the head. The frame carries a latch and one or more funnels for receiving probes on the submersible and a load-carrying line extends from the winch and through the frame.
Although the swinging of the head and the frame relative to the A-frame about a transverse axis accommodates some of the complex movement between a motor ship and a submersible it does not accommodate rolling movement. This has proved to be a problem in docking on recovery of the submersible from the water and in inducing damaging forces on the A-frame and on the submersible.
It is an object of the invention to obviate or mitigate this problem.
According to the invention, there is provided an off-shore load-handling system comprising a support for moving a load between two positions substantially at the same level, and a mechanism mounted on the support for raising and lowering a load, the mechanism including a hydraulically-operable docking and load-carrying member mounted on the support with provision for swinging movement of the docking member relative to the support about two mutually perpendicular axes, means for damping such swinging movement, and a load-carrying line, the docking member having a latch for securing a load thereto, means for locating the load thereon and means for guiding the load-carrying line.
Embodiments of the invention will now be described, by way of example, with reference to the accompanying drawings, in which:
FIG. 1 is a perspective view of a handling system, for a submersible, as mounted at the stern of a mother ship;
FIG. 2 is an elevation of the handling system;
FIG. 3 is a section in a vertical plane lying transversely of the mother ship through a load-carrying line of a modified part of the handling system shown in FIGS. 1 and 2; and
FIG. 4 is the same as FIG. 3 except that the vertical plane of the section lies longitudinally of the mother ship.
In FIGS. 1 and 2 the handling system comprises an A-frame 1 having side arms 2 and 3 and a cross member 4 interconnecting the arms 2 and 3 at outer ends thereof. The inner ends of the arms 2 and 3 are pivoted in mountings 5 and 6 on the ship's deck at the stern thereof. Further forward on the ship's deck are mountings 7 and 8 between which and brackets 9 and 10 on the arms 2 and 3 are articulated hydraulic rams 11 and 12.
Inboard of the arms 2 and 3 and depending from the cross member 4 are brackets 13 and 14 between which is swingably suspended on a winch head 15 within which is mounted a winch 16 about which is rove a load-carrying line 17. The line 17 extends downwards from the winch 16 between two hydraulic rams 18 and 19 interconnecting the head 15 and an upper frame 20. The head 15 and the frame 20 are also interconnected by a telescopic leg 21 aft of the line 17 and which serves to guide the movement of the frame 20 linearly relative to the head 15. The frame 20 also has an upper fairlead 22 for the line 17 and comprising at least two and preferably four rollers.
A lower frame 23 is swingably suspended from the frame 20 about an axis perpendicular to the swinging axis of the head 15. The frame 23 carries a lower fairlead 24 comprising at least two and preferably four rollers, for the line 17. The frame 23 also carries a latch (not shown) for an attachment point on a submersible 25 for the line 17. Furthermore, the frame 23 carries docking funnels 26, 27 and 28 for receiving probes on the submersible. Above the funnels 26 and 27 are stops 29 and 30 to limit the amount of swing of the frame 23 relative to the frame 20.
It should be noted that the frame 23 and thus the submersible 25 can swing about a tr
REFERENCES:
patent: 3401804 (1968-09-01), Link
patent: 3807334 (1974-04-01), Egeberg
patent: 3955522 (1976-05-01), Gaudiano et al.
patent: 4531647 (1985-07-01), Higuchi et al.
McCallum Robert
Mitchell David
Basinger Sherman D.
Caley Hydraulics Limited
Salmon Paul E.
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