Abstract: A remote heave compensation system associated with a crane on a vessel may include a heave compensator arranged remotely from the crane and configured to translate in association with and to compensate for heaving motion of the vessel, an equalizer arranged on the crane and coupled to an end of a multiline system of the crane, a heave line secured to the equalizer at a first end and secured to the heave compensator at a second end, wherein compensating motion of the heave compensator is transferred to the equalizer by the heave line to compensate for heaving motion of the vessel and stabilize objects suspended from the multiline system of the crane.

Abstract: A lifting device may include a level setting portion and an adjustable beam assembly pivotally secured to the level setting portion and including a structural beam portion and an adjustment portion configured for translating along the structural beam portion, where the adjustable beam assembly includes a sensor for sensing when the structural beam portion is unbalanced and an actuation system for translating the adjustment portion to bring the structural beam portion into a balanced condition.

Abstract: A lifting device may include a level setting portion and an adjustable beam assembly pivotally secured to the level setting portion and including a structural beam portion and an adjustment portion configured for translating along the structural beam portion, where the adjustable beam assembly includes a sensor for sensing when the structural beam portion is unbalanced and an actuation system for translating the adjustment portion to bring the structural beam portion into a balanced condition.

Abstract: A remote heave compensation system associated with a crane on a vessel may include a heave compensator arranged remotely from the crane and configured to translate in association with and to compensate for heaving motion of the vessel, an equalizer arranged on the crane and coupled to an end of a multiline system of the crane, a heave line secured to the equalizer at a first end and secured to the heave compensator at a second end, wherein compensating motion of the heave compensator is transferred to the equalizer by the heave line to compensate for heaving motion of the vessel and stabilize objects suspended from the multiline system of the crane.

Abstract: An apparatus for increasing the available hook raising and lowering distance is attached to a crane or other lifting structure having a boom and at least one lifting tackle utilizing at least one lifting line connected to a prime mover. The apparatus utilizes a support means attached to the crane boom substantially at the connection point of an existing upper tackle. A fixed, lower gripper platform is suspended from the support means and has at least one linear winch grip mounted thereon. A movable, upper gripper platform is connected to at least one lifting line associated with the lifting tackle. The upper gripper platform has at least one linear winch grip mounted thereon. The upper gripper platform is also adapted to reciprocate between the lower gripper platform and the upper tackle in response to the prime mover drawing in or paying out the lifting line. At least one extended load line for attachment to a load passes through the linear winch grips on the lower and upper gripper platforms.

Abstract: A crane block (FIG. 2) is provided for traveling along a central main fall symmetry line (78) defining vertical travel during movement of a hoist within a barge mounted crane. The crown block (50) is mounted to a crane boom (12) and includes a first row of relatively large diameter sheaves (54) in tandem with a second row of relatively small diameter sheaves (58). A movable block (76) is provided between the traveling block (74) and the crown block (50) and includes a third row of relatively small diameter sheaves (60) which are reeved together with the second row of sheaves. A traveling block (74) is provided with a fourth row of relatively large diameter sheaves (56) which are reeved together with the first row of sheaves (54). Sheaves in either the second (58) or third (60) rows are horizontally canted with respect to the main fall symmetry line (78) for vertical travel of the rope which is reeved between the rows.