Underwater chain stopper and fairlead apparatus for...

B - Operations – Transporting – 63 – B

Patent

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Details

B63B 21/50 (2006.01) B63B 21/04 (2006.01) B63B 21/10 (2006.01)

Patent

CA 2564723

An underwater chain stopper and fairlead apparatus for offshore structures, drilling platforms, ships or other vessels. The apparatus comprises a mounting member, a fairlead member and a chain stopper member. The mounting member is attached to an underwater surface of the offshore structure or vessel and includes a bracket for coupling the fairlead member. The bracket may comprise a hinge allowing the fairlead member to pivot in an approximately horizontal plane. The chain stopper member is coupled to the fairlead member through a hinge which allows the chain stopper member to pivot with respect to the fairlead member in an approximately vertical plane. The chain stopper member includes a chain stopper flapper having a horseshoe shaped opening at one end. The other end of the flapper is connected to the chain stopper member through a hinge which allows the flapper to swing between an open position and a closed position. In the open position, the chain links for the anchor chain are allowed to pass by the horseshoe shaped opening on the flapper. The horseshoe shaped opening also includes a chain link seat which stops movement of the anchor chain through the chain stopper member when the flapper is in the closed position. The chain stopper flapper moves to the closed position under the force of gravity to provide a self-locking chain stopper. A latch mechanism is provided for latching the chain stopper flapper in an open position.

Cette invention concerne un appareil sous-marin à guillotine et à chaumard pour structures en mer, plates-formes de forage, navires ou autre bâtiments. Cet appareil comprend un élément de montage, un élément chaumard et un élément guillotine. L'élément de montage est fixé sur une surface immergée de la structure en mer ou du bâtiment et comprend un support servant au couplage de l'élément chaumard. Le support peut comprendre une charnière permettant à l'élément chaumard de pivoter dans un plan sensiblement horizontal. L'élément guillotine est couplé à l'élément chaumard par le biais d'une charnière permettant à l'élément guillotine de pivoter par rapport à l'élément chaumard dans un plan sensiblement vertical. L'élément guillotine comprend un volet de guillotine comportant une ouverture en forme de fer à cheval au niveau d'une extrémité. L'autre extrémité du volet est reliée à l'élément guillotine par le biais d'une charnière qui permet au volet de basculer entre une position ouverte et une position fermée. En position ouverte, les maillons de la chaîne d'ancre peuvent passer par l'ouverture en forme de fer à cheval du volet. L'ouverture en forme de fer à cheval comprend également une base de maillon de chaîne qui interrompt le mouvement de la chaîne d'ancre à travers l'élément guillotine lorsque le volet se trouve en position fermée. Le volet de guillotine passe en position fermée sous l'action de la force de gravité afin qu'on obtienne une guillotine à blocage automatique. Un mécanisme de verrouillage permet de verrouiller le volet de guillotine en position ouverte.

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