Telescopic lattice type crane boom for a crane, further comprising a locking system configured to lock at least one telescopic boom section with respect to a base boom section in at least an extended position, wherein said locking system includes a plurality of pins, each pin being configured to extend, in at least the extended position of the boom, at least partly through a corresponding pin receiving aperture provided in one of the base boom section and the at least one telescopic boom section.

Telescopic lattice type crane boom for a crane, further comprising a locking system configured to lock at least one telescopic boom section with respect to a base boom section in at least an extended position, wherein said locking system includes a plurality of pins, each pin being configured to extend, in at least the extended position of the boom, at least partly through a corresponding pin receiving aperture provided in one of the base boom section and the at least one telescopic boom section.

A slew bearing includes a stationary bearing ring to be fixed to a base, and a moveable bearing ring to be fixed to a moveable object, wherein the stationary bearing ring and the moveable bearing ring are configured to enable rotation of the moveable bearing ring relative to the stationary bearing ring about a rotation axis. A main axial bearing and an auxiliary bearing are provided between the stationary bearing ring and the moveable bearing ring, wherein the moveable bearing ring includes one or more main portions and one or more auxiliary portions, which one or more main portions are moveable relative to the one or more auxiliary portions between an operational position, in which the main axial bearing transfers the axial loads between moveable bearing ring and stationary bearing ring, and a raised maintenance position, in which the auxiliary axial bearing transfers the axial loads between moveable bearing ring and stationary bearing ring and the main bearing is allowed to be inspected and/or maintained so that the slew bearing during inspection and/or maintenance is still operational.

A slew bearing includes a stationary bearing ring to be fixed to a base, and a moveable bearing ring to be fixed to a moveable object, wherein the stationary bearing ring and the moveable bearing ring are configured to enable rotation of the moveable bearing ring relative to the stationary bearing ring about a rotation axis. A main axial bearing and an auxiliary bearing are provided between the stationary bearing ring and the moveable bearing ring, wherein the moveable bearing ring includes one or more main portions and one or more auxiliary portions, which one or more main portions are moveable relative to the one or more auxiliary portions between an operational position, in which the main axial bearing transfers the axial loads between moveable bearing ring and stationary bearing ring, and a raised maintenance position, in which the auxiliary axial bearing transfers the axial loads between moveable bearing ring and stationary bearing ring and the main bearing is allowed to be inspected and/or maintained so that the slew bearing during inspection and/or maintenance is still operational.

Systems and methods for remote control and automatization of tower cranes are provided herein. One system may include: a first sensing unit comprising a first image sensor configured to generate a first image sensor dataset; a second sensing unit comprising a second image sensor configured to generate a second image sensor dataset; wherein the first sensing unit and the second sensing unit are adapted to be disposed on a jib of a tower crane at a distance with respect to each other such that a field-of-view of the first sensing unit at least partly overlaps with a field-of-view of the second sensing unit; and a control unit comprising a processing module configured to: determine a real-world geographic location data indicative at least of a real-world geographic location of a hook of the tower crane.

Systems and methods for remote control and automatization of tower cranes are provided herein. One system may include: a first sensing unit comprising a first image sensor configured to generate a first image sensor dataset; a second sensing unit comprising a second image sensor configured to generate a second image sensor dataset; wherein the first sensing unit and the second sensing unit are adapted to be disposed on a jib of a tower crane at a distance with respect to each other such that a field-of-view of the first sensing unit at least partly overlaps with a field-of-view of the second sensing unit; and a control unit comprising a processing module configured to: determine a real-world geographic location data indicative at least of a real-world geographic location of a hook of the tower crane.

A pulley system for a confined space tripod includes a pulley including a pulley cavity having a first width and a second width. A pulley safety bracket is attached with the pulley. The pulley safety bracket includes a removable detent pin configured for placement above the pulley that prevents a pulley cable from dislodging from the pulley.

A personal safety system for lifting material or supporting person therefrom includes a base and a mast rotatably coupled to the base. The mast has a plurality of mast sections that telescope relative to each other along an axis such that the mast is movable into and between a lowered configuration and an extended configuration. A jib is coupled to the mast and a cable is coupled to the jib such that a cable is configured to couple to the material or the person such that the system is capable of lifting the material or supporting the person. An attachment device coupled to the base is configured to permit a vehicle to couple to the system via the attachment device.

Method and apparatus for a portable hoisting system (10) having an upright gin pole (38) which is attached to the upright standing very tall pole (14) or tower (15) using a plurality of straps (16). Extending away from the gin pole (38) is an angularly adjustable arm (40) which is user selectable to be either, e.g., at a 90-degree angle or a 45-degree angle, which arm (40) is supported by a brace (42) connected between the extension arm (40) and the upright gin pole (38). The gin pole (38) is hollow on its inside which allows a load line (18) to travel through the interior (60) of the gin pole (38) from its lower end to its upper outlet end and includes a plurality of pulleys (44) which allow the load line (18) to travel through the inside (60) of the hoisting system (10). Also included is a heel block (24) wherein one end of the load line (18) is connected to a capstan hoist (30) disposed on the front or rear end of a vehicle (32) and a ball (19) with hook (20) for supporting a load (22). Also included optionally is a tag line (34) connected to the load line (18) and being held by a ground member (36) for helping to control the movement of the load (22).

A tower crane includes a tower on which is pivotally mounted a boom displaceable between a lowered position and a raised position. The crane is configurable between a service configuration in which the boom is controlled in rotation and a weather vane configuration in which the boom is in the raised position and is released in rotation on the tower to allow orientation in the direction of the wind. A wind load system is mounted on the boom and is adjustable between a retracted shape in the service configuration providing a reduced surface exposed to the wind, and a deployed shape in the weather vane configuration providing an extended surface exposed to the wind. The wind load system is configured to move from the retracted shape to the deployed shape under the effect of its own weight alone (i.e., under gravity) when the boom is raised.