Provided is a display apparatus fir traveling cranes which is capable of displaying information about another traveling crane. The display apparatus for traveling cranes is equipped with: an imaging unit 20 which is mounted to the vicinity of the tip of a boom; a display unit 30 which displays an image captured by the imaging unit 20; a crane controller 40 which controls the orientation of a traveling crane; a communication unit 53 for mutually transmitting/receiving information to/from the other traveling crane; and an image controller 50 for displaying the information about the other traveling crane, received from the other traveling crane, in such a manner as to superimpose the information upon the image of the display unit.

The invention provides a loader having a boom, a hydraulic motor, a slewing ring, and a boom swing control assembly. The boom is configured to rotate in response to operation of the hydraulic motor. The boom swing control assembly comprises a control gear, a first valve, and a first hydraulic line. The control gear is engaged with a slew gear of the slewing ring such that the control gear rotates in response to rotation of the boom. The hydraulic line is in fluid communication with the first valve and the hydraulic motor. Depending on whether the first valve is in an open or a closed configuration, hydraulic fluid is either free to pass, or is restrained from passing, through the first hydraulic line to the hydraulic motor.

This overload preventing device is mounted on a mobile work machine, and is provided with: a storage unit which stores lifting performance data; and a work machine control unit which controls operation of the mobile work machine on the basis of the actual load and the lifting performance corresponding to the present operation state of the mobile work machine. A third lifting performance configured for a transition region, a first switching angle defining the boundary between the front region and the side region and the boundary between the back region and the side region when the outriggers are in different states of deployment, and a second switching region defining a transition region in the side region are configured on the basis of stability calculations and strength factors such as jack strength.

There is provided a mobile crane including an undercarriage, turning body turnably supported by the undercarriage, a boom derrickably supported by the turning body, a derricking unit that causes the boom to perform a derricking operation, a derricking force measurement unit that measures a derricking force by which the derricking unit causes the boom to perform the derricking operation, a ground angle acquisition unit that acquires a boom-to-ground angle which is an angle of the boom relative to a ground where the undercarriage is disposed, and an actually suspended load calculation unit that calculates an actually suspended load, based on the derricking force and the boom-to-ground angle.

There is provided a mobile crane including an undercarriage, turning body turnably supported by the undercarriage, a boom derrickably supported by the turning body, a derricking unit that causes the boom to perform a derricking operation, a derricking force measurement unit that measures a derricking force by which the derricking unit causes the boom to perform the derricking operation, a ground angle acquisition unit that acquires a boom-to-ground angle which is an angle of the boom relative to a ground where the undercarriage is disposed, and an actually suspended load calculation unit that calculates an actually suspended load, based on the derricking force and the boom-to-ground angle.

A rotary crane including a vertical axis; an jib that extends from the vertical axis; a drive for rotating the jib about the vertical axis; a condition monitoring which determines wind loading, namely internal force variables, tensions, strains, transverse forces, tilting and torsion torques of the rotary crane; and a computing unit which computes a preferred direction for locking the jib from the wind loading. The invention also relates to a method for orienting the rotary crane. In order to improve the orientation of the jib of a shut down rotary crane it is proposed that the rotary crane includes measuring elements for capturing local measuring local values of the wind loading.

A rotary crane including a vertical axis; an jib that extends from the vertical axis; a drive for rotating the jib about the vertical axis; a condition monitoring which determines wind loading, namely internal force variables, tensions, strains, transverse forces, tilting and torsion torques of the rotary crane; and a computing unit which computes a preferred direction for locking the jib from the wind loading. The invention also relates to a method for orienting the rotary crane. In order to improve the orientation of the jib of a shut down rotary crane it is proposed that the rotary crane includes measuring elements for capturing local measuring local values of the wind loading.

The present invention relates to a crane, in particular to a revolving tower crane, having a boom rotatable about an upright slewing gear axis by a slewing gear drive and having an out-of-operation brake which allows and brakes rotary movements of the boom in the out-of-operation state. In accordance with the invention, the out-of-operation brake is configured as working electrodynamically and comprises an electric motor of the slewing gear drive which can be operated as an electric-motor brake.

The present invention relates to a crane, in particular to a revolving tower crane, having a boom rotatable about an upright slewing gear axis by a slewing gear drive and having an out-of-operation brake which allows and brakes rotary movements of the boom in the out-of-operation state. In accordance with the invention, the out-of-operation brake is configured as working electrodynamically and comprises an electric motor of the slewing gear drive which can be operated as an electric-motor brake.

Provided is a crane that can detect obstacles within a sufficient range while traveling and while doing work. A crane that is provided with an obstacle sensor that, during travel, detects the approach of obstacles toward a front side part of a travel body and, during work, detects the approach of obstacles toward a rear side part of a turning body. According to a first embodiment, the obstacle sensor has a detection range that is directed from front to rear. According to a second embodiment, the obstacle sensor has a detection range that is directed from rear to front.