The disclosure relates to a crane (200) for erecting a tower including a plurality of tower segments (171, 72, 173, 174, 175), the crane (200) comprising: a telescopic mast (210), and a jib (230) rotatably mounted with respect to the telescopic mast (210) and comprising lifting equipment (240). The telescopic mast (210) comprises a lower mast segment (211) having one or more lower clamp assemblies (202, 204) for selectively gripping portions of the tower and a roller assembly (300) for rolling along the tower, and comprising one or more further mast segments (212, 213, 214, 215, 216) having an upper clamp assembly (206) for selectively gripping portions of the tower, the further mast segments (212, 213, 214, 215, 216) being slidable with respect to the lower mast segment (211). The disclosure also relates to methods for climbing a tower with a crane (200) and methods for mounting a wind turbine tower.

An equipment for installing and dismantling of a wind turbine system including a tower, a nacelle and a blades is capable of self-climbing along the tower via upper and lower grippers moving up and down the supporting frame equipped with two booms along the tower. The two booms aren't able to turn around in horizontal plan but are able to hoist, for example, the nacelle and pivot it to the top of the tower before placing it on the positioning frame. In order to combine the nacelle to the tower, the nacelle resting on the positioning frame shall be adjusted to the location of the tower in horizontal plan before the positioning frame is lowering it to the tower.

A method for making a nacelle and a nacelle for attachment to a wind turbine tower. The method comprising providing a main frame configured to form a load path from a drive train to the wind turbine tower, providing, on the main frame, a mounting structure for mounting a crane, providing a crane for mounting on the mounting structure, and mounting the crane to the mounting structure before the nacelle is attached to the wind turbine tower. The crane can then be used for assembly operation before the nacelle is attached to the wind turbine tower, e.g. at an assembly facility away from the tower where the wind turbine is erected.

A portable hoist assembly. The hoist assembly includes an attachment assembly to releasably attach the hoist assembly to a rooftop parapet wall or similar and a rotatable line pulling assembly (e.g., a winch) to pull lengths of line upward to hoist objects from the ground to the rooftop, and to release lengths of line downward to lower objects from the rooftop to the ground. The rotatable line pulling assembly is rotated using a power tool (e.g., a power drill) releasably coupled to its hub. The hoist assembly also includes a base support configured between the line pulling assembly and the top of the parapet wall to provide vertical support to the hoist. The hoist assembly also includes a separate ladder attachment assembly for attaching the hoist to a ladder.

The self-hoisting crane is adapted to be hoisted from a container to a nacelle by operating a cable winch in the container, at least one cable is adapted to extend from the cable winch, around an exit sheave arranged in the container, and exit the container from the exit sheave in an upward direction in order to pass around at least one roller arranged at a crane base on the nacelle and continue in a downward direction to the crane, enter through a central opening in the crane pedestal and continue to the hook block. The exit sheave is located at a longitudinal position of the container deviating not more than 10 percent of the length of the container from the longitudinal position of the centre of gravity of the container.

A building outrigger apparatus to provide an elevated work space or debris removal or crane services for use between concrete slabs of a building under construction having a container or platform to support a container or platform, a plurality of support beams, each support beam positioned lengthwise under the floor of the container and extend therefrom the sides, a pair of spaced apart outrigger beams, a first outrigger end and a second outrigger end, each second outrigger end in contact with and affixed to the upper side of each support beam end, the other outrigger beam end removeably anchored to the slab floor with the front edge of the container flush with the exterior or front slab edge, and, thus, functions to efficiently move or remove materials and tools or personnel space from floor to floor as construction phases move vertically.

A method and system for removing and storing vehicle hard tops is disclosed. The hard top removal system is comprised of a rack with webbing straps, a ceiling anchor, a wall anchor, a lifting line, pulleys and a winch. An object of the invention is to provide an easy means to remove and store a vehicle hard top when the vehicle is parked in a typical residential garage.

A boom assembly includes a boom housing having a longitudinal, internal cavity. A telescoping boom moves in an axial direction relative to the boom housing and has a first end positioned within the longitudinal, internal cavity and a second end positioned outside the longitudinal, internal cavity. A winch assembly moves with the movement of the telescoping boom. A winch cable extends from the winch assembly and is guided by a pulley. A portion of the winch cable extends over the pulley in an outward direction from the pulley. The extending portion of the winch cable has a length, and the length of the extending portion of the winch cable remains the same regardless of the axial movement of the telescoping boom relative to the boom housing.

The present invention relates to a securing assembly (1) for securing an elongated support tower (2) to a wind turbine tower (3). The securing assembly (1) comprises a base part (1a) including: a tower holding part (4), a fixed part (5), two arms (6), a plate (6c) arranged at the outer part of each of the two arms (6), the plates (6c) can adapt to the curvature of the wind turbine tower (3) and each comprising at least one rope sliding element (9). The securing assembly (1) comprises a rope (8), being arranged via the rope sliding elements (9), and a rope tightening device (11) arranged on the base part (1a). The rope (8) presses the plates (6c) against the wind turbine tower (3) when tightened.

A portable derrick system for use in hoisting and lowering loads at a plurality of job sites, comprising, in combination: a boom subassembly, a boom head subassembly, a mast support subassembly, a mast head subassembly, a load-carrying line, a winch capable of cooperating with said line, power means for driving the winch, means for pivoting the boom assembly, means for controlling said pivoting means, the foregoing elements of the invention capable of being transported by humans to elevated positions such as, without limitation, rooftops and terraces, and wherein the aforementioned are capable of repeated assembly and disassembly at a plurality of job sites and serving to facilitate the elimination of the need for a street-level crane.