A rotary tower crane with a tower, which carries a jib and a counterjib, with a jib stay being guided from a tower top to the jib and to the counterjib. The jib stay tensions only an inner jib portion, the length of which is less than 40% of the total length of the jib, and an outer portion, the length of which is more than 60% of the total length of the jib, forms an untensioned bending beam jib which includes at least one jib piece which tapers in height and which is adjoined on the inner side by at least one jib part of greater height and on the outer side by a jib piece of smaller height.

A rotary tower crane with a tower, which carries a jib and a counterjib, with a jib stay being guided from a tower top to the jib and to the counterjib. The jib stay tensions only an inner jib portion, the length of which is less than 40% of the total length of the jib, and an outer portion, the length of which is more than 60% of the total length of the jib, forms an untensioned bending beam jib which includes at least one jib piece which tapers in height and which is adjoined on the inner side by at least one jib part of greater height and on the outer side by a jib piece of smaller height.

A ballast arrangement for a rail vehicle includes at least one ballast device. The at least one ballast device has a concrete weight body, at least one built-in metal reinforcement, and at least one securing device built into the weight body. There is also described a method for producing a ballast arrangement according to the invention.

A powered handler for handling a workpiece, comprising: a body extending between a first and a second end; an input device adjacent the first end; a handling implement adjacent the second end, the handling implement operatively connected to the input device and operable to handle the workpiece; and a suspender having a proximate end mounted to the body at at least one pivot of the suspender defining a pitch axis of the powered handler, the body pivotable relative to the suspender about the pitch axis, the at least one pivot disposed between the input device and the handling implement and displaceable relative to the body to a balanced position located between a first and a second position closer to the second end than the first position, the suspender having a distal end spaced upwardly from the body for mounting the suspender to suspend the body from the suspender.

A powered handler for handling a workpiece, comprising: a body extending between a first and a second end; an input device adjacent the first end; a handling implement adjacent the second end, the handling implement operatively connected to the input device and operable to handle the workpiece; and a suspender having a proximate end mounted to the body at at least one pivot of the suspender defining a pitch axis of the powered handler, the body pivotable relative to the suspender about the pitch axis, the at least one pivot disposed between the input device and the handling implement and displaceable relative to the body to a balanced position located between a first and a second position closer to the second end than the first position, the suspender having a distal end spaced upwardly from the body for mounting the suspender to suspend the body from the suspender.

A boom assembly according to the disclosure may include a lower boom structure, and an upper boom structure that is connected to the lower boom structure. In addition, the boom assembly may include a counterweight movably mounted on one of the boom structures and movable along the one boom structure when at least a portion of the lower boom structure is moved relative to the upper boom structure or when at least a portion of the upper boom structure is moved relative to the lower boom structure.

The present invention relates to a crane, in particular in the form of a revolving tower crane, having a jib (3) and a counter-jib (4), which are articulated on a jib articulation piece (8), wherein the jib (3) comprises an outer jib part (3a), which is articulated on an inner jib part (3i) in a hinged manner and is held by a guy (10). According to the invention, the inner jib part (3i) is in the form of a cantilever, which is fastened to the jib articulation piece (8) in a flexurally rigid manner and held, wherein the outer jib part (3a) is articulated on the cantilever in a hinged manner and is held by the guy (10).

The present invention relates to a crane, in particular in the form of a revolving tower crane, having a jib (3) and a counter-jib (4), which are articulated on a jib articulation piece (8), wherein the jib (3) comprises an outer jib part (3a), which is articulated on an inner jib part (3i) in a hinged manner and is held by a guy (10). According to the invention, the inner jib part (3i) is in the form of a cantilever, which is fastened to the jib articulation piece (8) in a flexurally rigid manner and held, wherein the outer jib part (3a) is articulated on the cantilever in a hinged manner and is held by the guy (10).

The present invention relates to an eco-friendly wind power generation apparatus that can perform power generation using wind by providing the blades of a wind power generator on a jib of a tower crane, and can perform wind power generation at the optimum altitude and in the optimum direction by automatically or manually performing the lifting/lowering and swing operation of a jib even when wind speed is insufficient because wind is not blowing, or perform wind power generation using artificial wind power generated by the operation of the jib, thereby generating a lot of electricity in necessary places and supply the electricity to all industrial sectors regardless of location and environment.

The present invention relates to an eco-friendly wind power generation apparatus that can perform power generation using wind by providing the blades of a wind power generator on a jib of a tower crane, and can perform wind power generation at the optimum altitude and in the optimum direction by automatically or manually performing the lifting/lowering and swing operation of a jib even when wind speed is insufficient because wind is not blowing, or perform wind power generation using artificial wind power generated by the operation of the jib, thereby generating a lot of electricity in necessary places and supply the electricity to all industrial sectors regardless of location and environment.