Ships – Mooring device – Having ship-mounted turret
Reexamination Certificate
2000-02-22
2001-06-26
Basinger, Sherman (Department: 3617)
Ships
Mooring device
Having ship-mounted turret
Reexamination Certificate
active
06250243
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to an arrangement for turning a turret on a ship.
2. Related Art
The present invention relates to an arrangement for turning a turret on a ship, and in particular to an arrangement having hydraulic driving cylinders.
One such arrangement is known from United Kingdom Patent 2 307 891, granted on application PCT/NO95/00124 and entitled “Arrangement for Supporting and Controlling a Vehicle in Relation to a Corresponding Turret”, the contents of which are incorporated herein by reference. In this publication the two units are positioned substantially tangentially to the rim, and are connected to a space consuming structure outside of the rim. The slide, which is referred to as clamping means, is slideably arranged on the rim and is “forced to a tilted about position in order to be clamped in a clamping engagement about a T-shaped guide ring” by an outwardly directed pressure force from the related hydraulic cylinder. Here it may seem like the clamping engagement is caused by a wedging of the slide on the guiding ring. A such wedging action can be maintained only if the hydraulic cylinder excercises a sufficient force, something that cannot be guaranteed in all circumstances, and the predictability of such a system is thereby not satisfactory. Furthermore, the engagement between the slide and the rim is based on frictional forces and thereby very large pressure forces against the rim, which quickly can cause wear and flattening of the material in the contact surfaces.
SUMMARY OF THE INVENTION
The object of the present invention is thus to avoid the above-mentioned disadvantages and at the same time obtain savings with regard to space, weight and costs.
This invention provides an arrangement for turning a turret on a ship, the turret comprising a rim having a flange arrangement thereon. There is at least one slide that can glide along the flange arrangement and optionally be locked onto the rim. The slide is driven by a hydraulic cylinder acting between the slide and the structure of the ship. The slide, together with the related hydraulic cylinder, forms one unit of a pair of such units, the two units acting in substantially opposite directions on the rim and preferably being controlled by a mutual control system which can cause one of the hydraulic cylinder units to remain locked while the other unit is moved by its hydraulic cylinder.
REFERENCES:
patent: 3774562 (1973-11-01), Dean, III
patent: 4753553 (1988-06-01), Carlsen et al.
patent: 5762017 (1998-06-01), Groves
patent: 0 207 915 A1 (1987-01-01), None
patent: WO 96/06001 A1 (1996-02-01), None
Borseth Knut E.
Oigarden Hans
Wierli Olav
Basinger Sherman
dsc Engineering AS
Libert & Associates
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