| 摘要 |
A drilling or service rig ( 1 ) for use in operations on- or offshore, the rig ( 1 ) being formed by a derrick structure ( 3 ) projecting from a foundation ( 11 ) and being arranged to receive a carriage ( 7 ), movable along the longitudinal axis of the derrick structure, for a drilling or service device ( 17 ), the carriage ( 7 ) being arranged to carry out, under the influence of at least one double-acting hydraulic cylinder ( 9, 15 ), a relative movement along the longitudinal axis of the derrick structure ( 3 ), and at least one of the at least one cylinder being formed by a double-acting, telescopic cylinder ( 9 ) which is arranged to exert both a push force and a pull force on the carriage ( 7 ), whereby the said carriage ( 7 ) is moved respectively away from or towards the foundation ( 11 ) of the rig.
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