Method and device (1) for lifting loads (7). An arm (2) that is the load or that supports a load (7) is pivotably connected to a reference. The load results in a torque. At least a part of the counter-torque to result in a system supporting the load is provided by a gas or hydro-pneumatic spring (60).

The present invention refers to loading crane comprising: an articulated arm, comprising at least one first and one second bodies successively connected in order to form an open kinematic chain, wherein the second body is translatingly and/or rotatably movable with respect to the first body; a hydraulic circuit adapted to convey a working fluid for actuating the articulated arm.

Said hydraulic circuit comprises a segment associated to one of the first and second bodies comprising: at least one sliding rigid tube slidingly translatingly connected to the body to which the segment of the hydraulic circuit is associated; at least one stationary tube integrally connected to the body to which the segment of the hydraulic circuit is associated; a flexible tube fluidically interconnecting the sliding rigid tube and the stationary tube.

A grappler assembly having an assembly framework and a grappler device that is supported by the assembly framework. The grappler device has at least one pair of grappler arms that engages with a desired section of a tree to be removed. The grappler assembly incorporating its own independent power module for supplying hydraulic power to the grappler device and controlling operation of the at least one pair of grappler arms, and the power module is mounted solely to the assembly framework.

A collection device can include an enclosure defining a top opening and a bottom opening; a latch coupled to the enclosure and configured to selectively secure a base to the enclosure proximate to the bottom opening; and an actuator coupled to the latch, the actuator controlled remotely and configured to open the latch and thereby release the base.

A collection device can include an enclosure defining a top opening and a bottom opening; a latch coupled to the enclosure and configured to selectively secure a base to the enclosure proximate to the bottom opening; and an actuator coupled to the latch, the actuator controlled remotely and configured to open the latch and thereby release the base.

A hoisting apparatus includes a rotation device with connectors for connecting pressure-medium lines to a rotation device, a boom, from which the pressure-medium lines are arranged to lead to the rotation device, and a pivoted joint for suspending the rotation device on the boom. The pivoted joint includes two consecutive pivots in a longitudinal direction of the rotation device. The rotational axes of the pivots are at right-angles to each other. The pressure-medium lines are routed between lugs of the pivot on a boom side of the pivoted joint, past the connectors of the rotation device in the longitudinal direction of the rotation device, to turn towards the connectors to form a hose loop and then routed to the connectors of the rotation device. The pressure-medium lines are arranged on both sides of the rotation device related to a plane defined in the longitudinal direction of the boom and the longitudinal direction of the rotation device.

A hoisting apparatus includes a rotation device with connectors for connecting pressure-medium lines to a rotation device, a boom, from which the pressure-medium lines are arranged to lead to the rotation device, and a pivoted joint for suspending the rotation device on the boom. The pivoted joint includes two consecutive pivots in a longitudinal direction of the rotation device. The rotational axes of the pivots are at right-angles to each other. The pressure-medium lines are routed between lugs of the pivot on a boom side of the pivoted joint, past the connectors of the rotation device in the longitudinal direction of the rotation device, to turn towards the connectors to form a hose loop and then routed to the connectors of the rotation device. The pressure-medium lines are arranged on both sides of the rotation device related to a plane defined in the longitudinal direction of the boom and the longitudinal direction of the rotation device.

A system and method are disclosed for building a modular electrical system for a jack up rig, the method including but not limited to identifying rig equipment on the jack up rig that will be connected to the modular electrical system; selecting electrical equipment to control the rig equipment; placing the electrical equipment in an electrical module; and electrically connecting the electrical equipment to power cables and control cables inside of the electrical module; and testing the electrical equipment inside of the electrical module.

The invention relates to a crane, in particular a rotary tower crane, comprising a crane boom, from which a load hook can be raised and lowered via a hoist cable, and an electric power supply on the load hook and/or an optionally provided trolley which can be moved on the crane boom. According to the invention, the electric power is directly generated at the location where it is required, and in the process kinetic energy present at said location is converted into power. According to the invention, the electric power supply comprises a generator which is arranged on the load hook and/or on the trolley and which can be driven by a deflecting and/or running pulley and/or a cable running around the deflecting pulley.

The invention relates to a crane, in particular a rotary tower crane, comprising a crane boom, from which a load hook can be raised and lowered via a hoist cable, and an electric power supply on the load hook and/or an optionally provided trolley which can be moved on the crane boom. According to the invention, the electric power is directly generated at the location where it is required, and in the process kinetic energy present at said location is converted into power. According to the invention, the electric power supply comprises a generator which is arranged on the load hook and/or on the trolley and which can be driven by a deflecting and/or running pulley and/or a cable running around the deflecting pulley.