Ships – Mooring device – Boom type
Patent
1997-03-26
1998-11-24
Basinger, Sherman
Ships
Mooring device
Boom type
B63B 2100
Patent
active
058393870
DESCRIPTION:
BRIEF SUMMARY
Present invention relates to an arrangement for storing of a vessel relative to a turret moored to the sea bottom and for turning around the vessel in a controlled manner about a substantially vertical turret axis, where the vessel can be permitted a controlled minimal movement longitudinally of and transversely of the turret axis and where the vessel is adapted to be locked, by means of at least two opposite locking systems, in regulatable angular positions about the turret axis.
In NO 160 701 there is shown a solution as defined correspondingly above. There is illustrated and described an axial mounting and a radial mounting together with a safety mounting, with their respective pairs or sets of journals. There is consequently employed a mounting in three mutually separated zones with their respective sets of pressure-exerting means. Furthermore for each of the two main bearings, of the said three bearings, an active system is employed with position regulating means (hydraulic cylinders, pressure sensors, and the like), while for the third bearing a simpler arrangement is employed with yielding buffer members (of rubber).
A main object of the present invention is to provide an especially simple, totally passive suspension system, which is based on spring force.
Another object is aimed at absorbing combined forces in a concentrated region of the turret.
The arrangement according to the invention is characterized in that vertical and horizontal forces, which are transferred between vessel and turret, are adapted to be centered and relieved jointly in a limited region above the deck of the vessel in a support ring fastened to the peripheral surface of the turret via an annular series of separate spring-loaded bearing systems, which are fastened separately to the deck of the vessel, the support ring being slidably mounted in each bearing system in its respective bearing member, which is arranged in ring form in a single closed ring of bearing members.
According to the invention the horizontal and vertical forces can consequently be transferred between vessel and turret together, that is to say in concert, via a single series of bearing systems which are arranged in closed ring form around a cooperating, common support ring on the turret. By employing a single series of bearing members instead of two or more series of bearing members, the constructional support of the vessel in the turret is simplified and in addition the control is facilitated of the forces which act between the turret and the vessel. As to control it is especially favourable that the bearing members are mutually connected in closed ring form.
By employing separate, spring-loaded bearing systems according to the invention, an especially simple, but nevertheless operatively reliable, passive bearing system can be achieved. Consequently there can be avoided for one thing such extensive and complicated position regulating systems, as are proposed according to NO 160 701.
It is a particular advantage according to the invention that each bearing system comprises an axially movable piston-cylinder means, which at the one end is pivotally mounted in the bearing member and at the opposite end is pivotally mounted in a trestle fastened on the deck of the vessel, the piston-cylinder means being compressibly and extendably arranged in an axial direction, from a pressure-loaded starting position, against the force from oppositely acting pressure means (springs), while the piston-cylinder means is carried between the ends by a tension-transferring carrier means, which is arranged in a direction substantially at right angles to the axial direction of the piston-cylinder means.
According to the invention one can hereby achieve a favourable constructional solution by using pressure means in the form of springs, in that a first spring in the piston-cylinder means is employed as a counter-force against compression of the piston-cylinder means, while a second spring in the piston-cylinder means is employed as a counter-force against the extension of the piston
REFERENCES:
patent: 4698038 (1987-10-01), Key et al.
patent: 4753553 (1988-06-01), Carlsen et al.
patent: 5372531 (1994-12-01), Boatman et al.
Basinger Sherman
I.P. Huse A.S.
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