A conveying device includes: a main movement body; a main conveying mechanism that conveys the main movement body; and a controlling device that controls operation of the main conveying mechanism including a plurality of winches attached to the main movement body and multiple cables one wound around each winch; each winch includes a cylindrical drum rotatable about an axis line thereof and driving device that rotates the drum, and is wound around corresponding one of the drums of the respective corresponding winches helically in an axis direction of the drums multiple times, and have distal ends supported by supporting bodies corresponding to the respective winches; and the controlling device conveys the main movement body to an arbitrary position on a conveying path between the supporting bodies corresponding to the respective winches by controlling operation of a driving device of each winch disposed on the main movement body.

A crawler-type crane includes an upper turning body and a lower traveling body on which the upper turning body is turnably mounted and which has a pair of left and right side frames; a car body that connects both the side frames to each other to support the upper turning body; and a front lower weight and a rear lower weight attached to both front and rear end sides of the car body. Rotational moments with reference to the center position of the upper turning body of the front lower weight and the rear lower weight are made different from each other.

A crawler-type crane includes an upper turning body and a lower traveling body on which the upper turning body is turnably mounted and which has a pair of left and right side frames; a car body that connects both the side frames to each other to support the upper turning body; and a front lower weight and a rear lower weight attached to both front and rear end sides of the car body. Rotational moments with reference to the center position of the upper turning body of the front lower weight and the rear lower weight are made different from each other.

A crane includes a lower traveling body, an upper turning body that is turnably provided on the lower traveling body, a counterweight that is mounted on the upper turning body, and a ladder for getting on and off the upper turning body. The ladder has an engagement member that is able to be engaged with and disengaged from an engaged portion provided at the upper turning body, a support portion that supports the engagement member, and a following mechanism that is interposed between the engagement member and the support portion. When the engaged portion in a state of being engaged with the engagement member is moved downward with work of mounting the counterweight, the following mechanism causes the engagement member to follow downward movement of the engaged portion.

A crane includes a lower traveling body, an upper turning body that is turnably provided on the lower traveling body, a counterweight that is mounted on the upper turning body, and a ladder for getting on and off the upper turning body. The ladder has an engagement member that is able to be engaged with and disengaged from an engaged portion provided at the upper turning body, a support portion that supports the engagement member, and a following mechanism that is interposed between the engagement member and the support portion. When the engaged portion in a state of being engaged with the engagement member is moved downward with work of mounting the counterweight, the following mechanism causes the engagement member to follow downward movement of the engaged portion.

A hoist support system includes a rail assembly having a rail along which a motor assembly is translatable by actuation of a motor of the motor assembly. The motor assembly is adapted to support a hoist and is communicatively coupled to a control system. The control system is adapted to measure motion of a slung load coupled to the hoist and to determine whether and to what extent the slung load is swinging or otherwise unstable. In response to such measurements, the control system transmits control signals to the motor of the motor assembly to change the position of the motor assembly along the rail and attenuate the motion of the slung load.

A hoist support system includes a rail assembly having a rail along which a motor assembly is translatable by actuation of a motor of the motor assembly. The motor assembly is adapted to support a hoist and is communicatively coupled to a control system. The control system is adapted to measure motion of a slung load coupled to the hoist and to determine whether and to what extent the slung load is swinging or otherwise unstable. In response to such measurements, the control system transmits control signals to the motor of the motor assembly to change the position of the motor assembly along the rail and attenuate the motion of the slung load.

An overhead travelling crane having a horizontally extending crane girder, which can be displaced in a railbound manner along a craneway, and having a crane trolley, which can be displaced along the crane girder and carries a lifting gear for raising and lowering a load. The lifting gear has a suspension structure formed as a cable or chain and the overhead travelling crane has electric drives for movements of the overhead travelling crane. The overhead travelling crane has an energy store connected to the drives to supply the drives with energy.

An overhead travelling crane having a horizontally extending crane girder, which can be displaced in a railbound manner along a craneway, and having a crane trolley, which can be displaced along the crane girder and carries a lifting gear for raising and lowering a load. The lifting gear has a suspension structure formed as a cable or chain and the overhead travelling crane has electric drives for movements of the overhead travelling crane. The overhead travelling crane has an energy store connected to the drives to supply the drives with energy.

The invention relates to a mobile crane travel gear axle with suspensions, which are independent of one another, of the wheel carriers arranged on both sides of the travel gear frame of the mobile crane, wherein the suspensions each have at least one transverse link which couples the wheel carrier to the travel gear frame and which is connected to the travel gear frame so as to be rotatable about an axis extending substantially parallel to the longitudinal axis of the travel gear frame.