Abstract: A first width direction bending portion bendably connects a portion of a guy link on a distal end side with respect to a first link portion to the first link portion in a width direction. When the guy link is in a stored state, the portion of the guy link located on the distal end side with respect to the first width direction bending portion is disposed outside the first link portion in the width direction. When the guy link is in a stored state, at least a portion of the guy link is disposed on the outer side in the width direction than a front strut and on a back surface or a side surface of a lower jib.

Abstract: A crane includes a base, an upperstructure rotationally mounted on the base, a boom pivotally mounted to the upperstructure at a front attachment location and having a distal end supporting a load line for raising a payload, and a gantry mounted on the upperstructure and supporting a boom line coupled to the distal end of the boom. The gantry includes at least one front leg mechanically coupled to the front attachment location and inclined in a direction away from the boom to apply, to the front attachment location, a horizontal force component towards the boom that is opposed by a horizontal force component applied by the boom towards the front leg. The upperstructure includes a circular turret, and the front attachment location is aligned over a circle of the turret.

Abstract: A method for mounting a wind turbine blade to a wind turbine hub by use of a crane boom is provided. An orientation of the blade is kept substantially horizontal when the blade is lifted off the ground and mounted to the rotor hub. Control wires, which connect the blade via the crane boom to a winch arrangement, are used for keeping the blade orientation substantially horizontal in addition to at least one bearing wire for bearing the blade weight.

Abstract: A vehicle crane—in particular an articulated-arm crane—includes a lifting arm and one or more articulated arms, and the geometry of the crane arms can be changed with respect to one another. A load cable can be guided or is guided on the crane arms. A compensation device allows the tension in the load cable to be controlled or regulated upon a change in the geometry of the crane arms with respect to one another.

Abstract: A crane includes: a boom; a jib that is provided on a leading end side of the boom; and a strut that is provided at one or both of a leading end portion of the boom and a base end portion of the jib, and to which a jib support pendant is connected, the strut, to which the pendant is connected, being provided with strut rotationally moving means having: a first bar-like member rotationally connected, at a first end portion thereof on one side, to a leading end portion of the strut on an opposite side thereof to a side, on which the pendant is connected; and a direct acting apparatus that applies, to the first bar-like member, a force pulling the first bar-like member toward the other side along a longitudinal direction of the first bar-like member.

Abstract: This invention relates to a crane, in particular a telescopic crane, with a frame suspended on the load hook for taking up a special load, in particular for taking up a rotor blade of a wind turbine. In accordance with the invention a single guide cable without guying function is provided, which proceeding from the boom foot is tensioned parallel to the direction of the longitudinal axis of the boom system and is attached to the boom system at its end, wherein a frame suspended on the load hook is connected with the guide cable via at least two control cables.

Abstract: A method for mounting a wind turbine blade to a wind turbine hub by use of a crane boom is provided. The orientation of the blade is kept substantially horizontal when the blade is lifted off the ground and mounted to the rotor hub. Control wires which connect the blade via the crane boom to a winch arrangement are used for keeping the blade orientation substantially horizontal in addition to at least one bearing wire for bearing the blade weight.

Abstract: A method of deploying an object (14) onto the seabed in very deep water from a vessel having a heave compensated deck crane (12), comprises lowering the object a distance into the sea while being suspended in the crane wire (16). In an initial step, a first fibre rope section (4a) of a first length is connected to the object (14) via a first connector (3a) on the object before the lowering is started and is freely run out supporting from a storage reel (13) during the descent. Subsequently, the first rope section is the object via a second connector (3b) located at the upper end of the first rope section (4a), the second connector being supported by a support mechanism (1) on the vessel deck (8), followed by off-loading the crane wire (16) and disconnecting it from the object and heaving it up said first length for connection to the second connector (3b) at the vessel deck and taking over the load of the object.

Abstract: A method for mounting a wind turbine blade to a wind turbine hub by use of a crane boom is provided. The orientation of the blade is kept substantially horizontal when the blade is lifted off the ground and mounted to the rotor hub. Control wires which connect the blade via the crane boom to a winch arrangement are used for keeping the blade orientation substantially horizontal in addition to at least one bearing wire for bearing the blade weight.

Abstract: Foldable link rod system to be placed on a travelling frame comprises pivotally suspended link rods (16, 18) for raising and lowering an operation platform (14). A rotating stool (20) constitutes the connection between two link rods (16 and 18) which are placed in continuation to each other. The one part of the rotating stool (20) is linked to the free end of the first link rod (16) which at its opposite end is pivotally linked to a swinging rod system (26, 28, 30, 32). The second link rod (18) is linked to the other part of the rotating stool and at its other end it is linked to the operation platform (14). The two link rods are pivotal by means of each of their swinging devices (54-70) which are supported on the travelling frame (10, 12) and the rotating stool (20), respectively.

Abstract: The invention relates to a device for maintaining a tool attachment in a knuckle boom crane, preferably for forest machines, on a constant level above the ground. The knuckle boom comprises a main boom which can be raised and lowered by means of a double-acting hydraulic cylinder (4), and an outer boom pivotal relative to the main boom my means of a likewise double-acting hydraulic cylinder (6). To ensure the vertical adjustment of the tool attachment, the lift cylinder (4) is connectible to the outer boom cylinder (6) via a compensator (21) in such a manner that an amount of hydraulic fluid which is proportional to the amount of hydraulic fluid which upon activation of the outer boom is pressed out from the lifting or the lowering side, respectively, of one of the cylinders (4, 6), is pressed into the lowering or the lifting side, respectively, of the other cylinder.

Abstract: A load lifting crane for raising the load at a site and moving the load in a substantially horizontal direction to a remote site where the load is lowered. The crane includes a base support member which has a pivotally supported vertically extending mast carried thereon. A substantially horizontally extending boom is carried by the upper end of the mast for pendulous movement. An actuator strut is connected between the upper end of the mast and the base support member so that by selectively varying the length of the actuator strut, the mast is pivoted for shifting the boom. As the boom is shifted, it is shifted in a substantially pendulous movement relative to the mast thereby moving the load-carrying end of the boom substantially horizontally after lifting the load off of a site.

Abstract: To enable the crane driver of a double link level luffing crane to adapt the height of his cab above the ground to the size of the ship to be loaded or unloaded, the drivers cab is mounted at the end of a separate cab link having a hinge connection with a carriage movable on the strut member of the crane.

Abstract: A method and apparatus is disclosed for controlling the angle of a pivoted, pendant supported extensible boom and the mast-boom angle between working positions and a transport position. The structure for controlling the angle includes a wire rope driven by a winch and trained over a boom supporting hoist and over a pendant take-up hoist which includes a floating sheave assembly connected to an extensible portion of the boom by a fixed length pendant. Another fixed length pendant determines the mast-boom angle when the boom is in working position, and a floating sheave stop is pivoted to the mast in position to cradle and/or abut a portion of the floating sheave assembly for enabling complete control of the mast when moved between its transport position and working positions relative to the boom.

Abstract: A motion compensation system for a crane hoist serves to assist the crane operator in safely lifting loads from the deck of a heaving work boat. The crane hook follows the motion of the load because a level of pre-tension is maintained on the line by use of a counterweight connected to the reeving system. A hydraulic cylinder connected to the counterweight provides for locking movement of the counterweight and also provides a cushion at both ends of its travel. Movement of the piston in the cylinder is controlled by a system including a check valve controlling flow between opposite ends of the cylinder which permits the reeving system to take up line. A limit switch responds to movement of the piston and counterweight near the top of their travel to actuate a light to warn the operator of a need to pay out line. As the piston and counterweight approach the bottom of their travel which indicates the load is moving upward, another limit switch actuates a light to indicate time to lift the load.