公开(公告)号：EP0141570B1

公开(公告)日：1988-03-16

申请号：EP84307067.3

申请日：1984-10-16

申请人： VICKERS PLC

发明人： McCann, James ,  Langley, James ,  Hopper, Ian ,  Durham, Steven ,  Scott, Thomas ,  McOmish, Eric Robert

IPC分类号： E21B19/09 ,  B66C13/02

CPC分类号： E21B19/02 ,  E21B19/09

公开(公告)号：EP0141570A1

公开(公告)日：1985-05-15

申请号：EP84307067.3

申请日：1984-10-16

申请人： VICKERS PLC

发明人： McCann, James ,  Langley, James ,  Hopper, Ian ,  Durham, Steven ,  Scott, Thomas ,  McOmish, Eric Robert

IPC分类号： E21B19/09 ,  B66C13/02

CPC分类号： E21B19/02 ,  E21B19/09

摘要： A marine heave compensating device comprises a hydraulic piston and cylinder unit (15, 16) with its cylinder (15) secured to a support (10,11). The piston is connected via a piston rod (16) to a cross-head (17) on which a first set of pulleys (18) are rotatably mounted. Chains (19) secured at one end to the support (10,11) are entrained around pulleys (18) and support a yoke (20) on which is mounted a crown block (21). A cable (22) is reeved around crown block (21) and around a travelling block (23) which carries a tool carrier (24). The two ends of cable (22) are reeved around two second pulleys (26A,26B) rotatably mounted on the cross-head (17). End (22A) of cable (22) is connected to a draw-works and end (228) of cable (22) is connected to a tie-down.