A mobile crane includes: a lower traveling body including a pair of crawlers; an upper slewing body supported on the lower traveling body slewably about a slewing axis; a tiltable attachment including a boom tiltably supported on the upper slewing body; and a physical quantity detector. The lower traveling body has a reaction force receiving part for receiving a reaction force from the ground at a position away from the slewing axis in a boom direction in a state where the pair of crawlers are in contact with the ground, the boom direction coinciding with a horizontal component of a direction in which the boom extends from the upper slewing body, and the physical quantity detector detects a physical quantity which changes in accordance with a change in the reaction force received from the ground by the reaction force receiving part.

A boom attach/detach device includes a boom, an extensible cylinder, and a boom supporting device. At least a part of the boom supporting device is arranged more to a boom front end side than an upper slewing body. When the extensible cylinder conducts extension and contraction operation in a state where coupling between the upper slewing body and the boom by a boom foot pin is cut off, the boom supporting device supports the boom to enable a rear end portion of the boom to move in a boom axis direction. The boom can be attached or detached with ease without a need to use a separate power device from a crane to suppress increases in size, in mass, and in cost of an upper slewing body.

A crane having at least one jib system, a sensor unit for detecting a deformation of the jib system transversely to a load plane, and to an activatable adjustment unit for influencing the deformation of the jib system transversely to the load plane.

A load guiding arrangement realized for mounting to a crane, which load guiding arrangement comprises a number of load guides, wherein a load guide comprises a guide wire extending from a lower level of the crane to an upper level of the crane; a bridging connector realized to bridge a gap between the guide wire and a control wire, which bridging connector is free to travel along the guide wire and the control wire according to a vertical displacement of a load; and a control wire extending from a lower level of the crane, through the bridging connector to a lifting connector for connecting to the load, and through the bridging connector again to an upper level of the crane is provided.

A load guiding arrangement realized for mounting to a crane, which load guiding arrangement comprises a number of load guides, wherein a load guide comprises a guide wire extending from a lower level of the crane to an upper level of the crane; a bridging connector realized to bridge a gap between the guide wire and a control wire, which bridging connector is free to travel along the guide wire and the control wire according to a vertical displacement of a load; and a control wire extending from a lower level of the crane, through the bridging connector to a lifting connector for connecting to the load, and through the bridging connector again to an upper level of the crane is provided.

A davit comprising a column which is mountable for rotation about a generally upright axis and a jib, the jib being attached to the column, characterised in that the column is provided, on a first side thereof, with ribs defining a first channel.

A davit comprising a column which is mountable for rotation about a generally upright axis and a jib, the jib being attached to the column, characterised in that the column is provided, on a first side thereof, with ribs defining a first channel.

In order to more easily optimize periphery monitoring, there is provided a periphery-monitoring device that displays a periphery of a work machine in an overhead view. The periphery-monitoring device includes distance measurement means for acquiring distance information to an object on the periphery of the work machine, display means for displaying the object in a first aspect in accordance with the distance information, and exclusion target determination means for determining at least a portion of the object having a distance measured by the distance measurement means within a prescribed range, as an exclusion target object, in a predetermined detection mode. During work, the display means displays the object on the periphery in the first aspect by excluding the object determined as the exclusion target by the exclusion target determination means, in the objects detected by the distance measurement means.

The present invention relates to a structural frame of a crane, lifting device, material handler or a similar machine, comprising at least one elongate structural-frame strut. The invention also relates to such a machine comprising such a structural frame. According to a first aspect, it is proposed not to weld or screw a separate doubled panel or separate retaining lugs to the structural-frame element as a reinforcement, but rather to provide the structural-frame strut with integrally formed, seam-free reinforcement layers in the required, highly loaded region, in order to achieve an organically produced increase in wall thickness and/or cross section in a smooth and harmonious manner. These reinforcement layers are produced using 3D printing.

The present invention relates to a structural frame of a crane, lifting device, material handler or a similar machine, comprising at least one elongate structural-frame strut. The invention also relates to such a machine comprising such a structural frame. According to a first aspect, it is proposed not to weld or screw a separate doubled panel or separate retaining lugs to the structural-frame element as a reinforcement, but rather to provide the structural-frame strut with integrally formed, seam-free reinforcement layers in the required, highly loaded region, in order to achieve an organically produced increase in wall thickness and/or cross section in a smooth and harmonious manner. These reinforcement layers are produced using 3D printing.