Device for the handling and storage of boats in a vertical dry dock. The boats (16) are removed from the water (7) via forks (13) which slide in a sliding fork-shaped system (12) carrying a cradle (10). The forks are displaced via a motor driven rack and pinion (14) system. The run of the rack and pinion system is limited by sensors (5 et 20). The entire mechanism is supported by a structure (8) which carries a tower (9) and a sliding fork-shaped system (12) that enables the cradles (10) to be deposited in berths (2, 2a). A rolling bridge (6) enables the entire assembly to be moved along X, Y and Z axes. The device is specifically useful for vertical dry dock management of boats, allowing the latter to be removed from the water and stored safely, or removed from storage and placed onto the water, as needed.

Device for the handling and storage of boats in a vertical dry dock. The boats (16) are removed from the water (7) via forks (13) which slide in a sliding fork-shaped system (12) carrying a cradle (10). The forks are displaced via a motor driven rack and pinion (14) system. The run of the rack and pinion system is limited by sensors (5 et 20). The entire mechanism is supported by a structure (8) which carries a tower (9) and a sliding fork-shaped system (12) that enables the cradles (10) to be deposited in berths (2, 2a). A rolling bridge (6) enables the entire assembly to be moved along X, Y and Z axes. The device is specifically useful for vertical dry dock management of boats, allowing the latter to be removed from the water and stored safely, or removed from storage and placed onto the water, as needed.

The present invention relates to a crane, having a jib rotatable about an upright axis, at which jib a trolley is movably arranged, from which trolley a hoist rope connected to a load hook runs off, as well as a load hook position determining device for determining the position of the load hook. The load hook position may be determined optically by means of one camera only, which camera is mounted on the trolley of the crane and views from the trolley in a predetermined and thus known viewing direction downwards onto the load hook. In doing so, the position of the load hook in the camera image is determined by an image evaluator. To simplify detection of the load hook in the camera image, the image evaluator may include rope run determining means for determining the rope run of the hoist rope running off from the trolley.

Provided is a safety lighting system for an overhead crane comprising a laser generator capable of generating a laser signal; and a crane control system having a programmable logic circuit; wherein the laser generator is integrated with the crane control system; and wherein the laser generator is operable to project a laser signal onto a surface corresponding to the position of the crane or crane components and a method of using the safety lighting system to determine when an object has crossed into a designated safety zone.

Provided is a safety lighting system for an overhead crane comprising a laser generator capable of generating a laser signal; and a crane control system having a programmable logic circuit; wherein the laser generator is integrated with the crane control system; and wherein the laser generator is operable to project a laser signal onto a surface corresponding to the position of the crane or crane components and a method of using the safety lighting system to determine when an object has crossed into a designated safety zone.

A system and method for construction of a framed structure which permits on-site storage and relocation of construction materials using trolleys and cranes supported by the framed structure. The system provides a runway surface for removable attachment of trolleys, crane bridges, and platforms by offsetting the first longitudinal beam and a second longitudinal beam from a cross beam and where the first longitudinal beam, second longitudinal beam, and cross beam of the system provide components for the framed structure.

A system and method for construction of a framed structure which permits on-site storage and relocation of construction materials using trolleys and cranes supported by the framed structure. The system provides a runway surface for removable attachment of trolleys, crane bridges, and platforms by offsetting the first longitudinal beam and a second longitudinal beam from a cross beam and where the first longitudinal beam, second longitudinal beam, and cross beam of the system provide components for the framed structure.

A current operating mode of a lifting device is determined as the lifting device is moving a load in an operating area. An object in the operating area is positioned, in whose area the operation of the lifting device is restricted in comparison with the operating area around the object. A difference between the current operating mode of the lifting device and the restricted operating mode to be applied in the object is determined. On the basis of the difference, the distance travelled by the lifting device is determined when the current operating mode of the lifting device is changed to the operating mode to be applied in the restricted object.

A current operating mode of a lifting device is determined as the lifting device is moving a load in an operating area. An object in the operating area is positioned, in whose area the operation of the lifting device is restricted in comparison with the operating area around the object. A difference between the current operating mode of the lifting device and the restricted operating mode to be applied in the object is determined. On the basis of the difference, the distance travelled by the lifting device is determined when the current operating mode of the lifting device is changed to the operating mode to be applied in the restricted object.

Methods for nuclear power plant maintenance which reduces outage time while a polar crane is maintained. In some examples, the method includes the steps of placing an auxiliary crane on a set of rails of a polar crane, using the auxiliary crane to perform maintenance work while the polar crane is maintained, and removing the auxiliary crane after maintenance work on the polar crane is completed. In some further examples, the method includes placing a second auxiliary crane on the set of rails. Still in other example, bridge motors are used to turn the rails, allowing the auxiliary crane to reach every area of the plant floor.