Patent ID: 9238943
Filing Date: 2016-01-19
CPC Classification: B63B,E21B

Claim Text:
1. An offshore vessel comprising: a deck support structure; a deck supported by the deck support structure and having an upper surface and an undersurface; a through opening in the deck from the upper surface to the undersurface; a transporter adapted for translational movement within the opening; an adapter frame within the transporter moveable from a first position wherein a load on the adapter frame is borne by the transporter to a second position wherein a load on the adapter frame is substantially borne by the deck support structure and not by the transporter; a pair of openings in the adapter frame; at least two guide lines each passing through one of the openings in the adapter frame; at least two winches each connected to the deck support structure and engaged with one of the at least two guide lines; and, a pair of sheaves each mounted on a drilling riser tensioner supported by the adapter frame and in contact with one of the at least two guide lines.