Systems, methods, or apparatuses for electrically grounding telescoping booms are provided. The systems, methods, and apparatuses can involve a telescoping boom assembly comprised of a plurality of nestable boom segments, and at least one electrically conductive contact provided between each pair of adjacent or successive boom segments. Each electrically conductive contact electrically connects corresponding adjacent or successive boom segments, to provide a predictable or predetermined path of least resistance toward or to ground for current introduced to the telescoping boom by an external energizing source.

A hydraulic crane comprising: a rotatable column (7); a crane boom system comprising a first crane boom (11) connected to the column; and an electronic control device for controlling the movement of the column and the crane boom system on of the basis of control signals from a manoeuvring unit and a calculation model for boom tip control. The control device is configured to switch from a first control mode into a second control mode when the first crane boom is about to interfere with an obstacle. In the first control mode, the control device controls the crane boom movements in accordance with an ordinary control strategy. In the second control mode, the control device makes the load suspension point (P) of the crane boom system move along the trajectory defined by said control signals while controlling the crane boom movements in accordance with an auxiliary control strategy in which the first crane boom is prevented from interfering with the obstacle.

In a crawler crane, while a fly jib is in use, the fly jib is suspended from a coupling flange by a jib raising/lowering wire rope that is wound around a sheave, the sheave being slidably attached to a tip end side section of the fly jib. If the sheave is caused to slide by a jib raising/lowering cylinder attached to the fly jib, the fly jib suspended from the coupling flange by the jib raising/lowering wire rope inclines with respect to a boom. The raising/lowering mechanism of the fly jib is installed on the fly jib side, thus making it possible to easily perform work to extract/store the fly jib.

A boom section for the boom of a telescopic crane has a lower shell and an upper shell. The lower shell and the upper shell are welded to one another, and the weld seam extends between the lower shell and the upper shell angled in at least one region to at least one section edge of the boom section.

A rough terrain crane is equipped with dashboard cameras and digital cameras for capturing bird's-eye view image thereof. The equipment performs, when a load factor reaching 90%, a process of recording start for starting image data recording with the digital camera and a process of storing measurement value for recording a load factor concurrently with the process of recording start. The image data is recorded with the digital camera associated with the above activation condition, among the digital cameras installed in the rough terrain crane.

A cabinet includes a crane including an attachment board secured to the cabinet; a receptacle on the attachment board and including threaded holes; a hollow member on the attachment board; an outrigger on bottom of the attachment board and including a slot, a rear sliding tube, a caster mounted to a bottom of a rear end of the sliding tube, and a rod releasably secured to the sliding tube and in the slot; a boom having one end pivotably secured to the hollow member and including threaded holes, an extension extending from the other end and threadedly secured to the boom, a chain at an end of the extension, and two guard members a front portion of the boom; and an adjustable boom hoist having one end releasably secured to the threaded hole of the boom and the other end releasably secured to the threaded hole of the receptacle.

A slewing apparatus includes a control section that performs at least a slewing angular velocity pattern determination process. In the slewing angular velocity pattern determination process, the slewing angular velocity pattern is determined such that in a first interval and a second interval of a control time T that is shorter than a cycle determined by a pendulum length of a suspended load that is in a pendulum motion, a difference between a maximum angular velocity and a minimum angular velocity increases as the control time T decreases.

A device for supporting a cable of a capstan of a crane includes a main supporting structure; a pulley rotatably supported by the main supporting structure, adapted to guide the cable of the capstan; and a sensor for measuring the angular position of the pulley. The pulley includes an auxiliary crown having a plurality of projecting elements disposed along the circumference thereof, and the sensor includes a stationary body integral with the main supporting structure and a wheel rotatable with respect to the stationary body, including a deformable crown meshing with the auxiliary crown of the pulley and made of a material such to deform due to the engagement of the projecting elements, wherein the sensor further includes means for detecting the angular position of the wheel with respect to the stationary body of the sensor.

A knuckle boom crane includes a base with a top surface and a bottom surface, a slewing platform fixedly coupled to the top surface, a slew column rotatably coupled to the slewing platform, a counterweight coupled to the slew column and configured to pivot with the slew column, an intermediate boom pivotably coupled to the slew column, and a telescoping outer boom pivotably coupled to the intermediate boom. The knuckle boom crane further includes a plurality of outriggers pivotably coupled to the top surface between a stored position and a supporting position, a robotic driving unit rotatably coupled to the bottom surface and configured to drive the knuckle boom crane, and a plurality of base lifts coupled to the bottom surface and adjustable between a retracted and an extended position.

A load crane (1) main boom (3) comprises: a fixed tubular first boom section (4.sup.I), a tubular second boom section (4.sup.II) telescopically arranged and movable relative to the first fixed boom section (4.sup.I) between a retracted position and an extended position, and at least a tubular third boom section (4.sup.III) telescopically arranged and movable relative to the movable second boom section (4.sup.II) between a retracted position and an extended position; a hydraulic system (6) comprising: a first cylinder-piston group (7.sup.I) axially extending within the main boom (3), integrally connected with the fixed first boom section (4.sup.I) and connected to the movable second boom section (4.sup.II) so to move the latter relative to the fixed first boom section (4.sup.I) under the action of a pressurized working fluid; a second cylinder-piston group (7.sup.II) axially extending within the main boom (3), integrally connected with the movable second boom section (4.sup.II) and connected to the movable third boom section (4.sup.III) so to move the latter relative to the movable second boom section (4.sup.II) under the action of said pressurized working fluid; a first opening (13) and a second opening (20) at the first cylinder-piston group (7.sup.I) for injecting/discharging said pressurized working fluid into/from the hydraulic system (6); a first tube (14) and a sixth tube (19) hydraulically connecting the first (7.sup.I) and the second (7.sup.II) cylinder-piston groups, at least partially extending near the second cylinder-piston group (7.sup.II) along the axial direction thereof and connected to the latter in such a manner so that they form respective bends (27, 28),

The main boom (3) further comprises: a transversal second main rod (29.sup.II) connected to the second boom section (4.sup.II) supporting the second cylinder-piston group (7.sup.II), a second reinforcing plate (30.sup.II) connected to the second boom section (4.sup.II), comprising: a first (31) and second (32) opposite lateral portions internally fixed to the second boom section (4.sup.II) and comprising through holes where the second main rod (29.sup.II) is arranged, so to form first and second reinforcing elements for the latter; a central portion (33) connecting said first and second lateral portions (31, 32) and comprising a raised section (36), a lowered section (37) and a section