A device includes a bevel pinion meshed to a bevel ring in rigid fixation with a pinion gear engaged with a slew ring to control rotation of the slew ring. A rotation sensor provides an electrical output corresponding to a rotational position of an input gear of the rotation sensor. A reduction gearing system interposes the bevel ring and the input gear of the rotation sensor. The gearing reduction system provides a reduction ratio enabling the rotation sensor to determine rotational position of the slew ring

A device includes a bevel pinion meshed to a bevel ring in rigid fixation with a pinion gear engaged with a slew ring to control rotation of the slew ring. A rotation sensor provides an electrical output corresponding to a rotational position of an input gear of the rotation sensor. A reduction gearing system interposes the bevel ring and the input gear of the rotation sensor. The gearing reduction system provides a reduction ratio enabling the rotation sensor to determine rotational position of the slew ring

A method for controlling a materials handling and/or construction machine, such as a crane or cable excavator, wherein different control functions are selected on a screen of a controller with a touchscreen function by touching a control function symbol, and respective functional parameters of the selected control function are set. A working region boundary of a working region delimiting function for automatically deactivating and/or slowing down at least one actuator is displayed on the screen together with a display of the materials handling and/or construction machine and/or the work surroundings in the form of a touchscreen display element when the working region boundary is reached and is adjusted by touching and moving the working region boundary on the screen relative to the display of the materials handling and/or construction machine and/or the work surroundings thereof.

A method for controlling a materials handling and/or construction machine, such as a crane or cable excavator, wherein different control functions are selected on a screen of a controller with a touchscreen function by touching a control function symbol, and respective functional parameters of the selected control function are set. A working region boundary of a working region delimiting function for automatically deactivating and/or slowing down at least one actuator is displayed on the screen together with a display of the materials handling and/or construction machine and/or the work surroundings in the form of a touchscreen display element when the working region boundary is reached and is adjusted by touching and moving the working region boundary on the screen relative to the display of the materials handling and/or construction machine and/or the work surroundings thereof.

A slewing control device includes an attachment information acquisition unit, an angular velocity setting unit and a slewing control unit. The attachment information acquisition unit acquires attachment information for setting the maximum slewing angular velocity based on the transverse load acting on an attachment. The angular velocity setting unit sets the maximum slewing angular velocity of an upper slewing body based on the attachment information. The slewing control unit controls a slewing drive unit such that the slewing angular velocity of the upper slewing body does not exceed the maximum slewing angular velocity set by the angular velocity setting unit.

This disclosure provides a system and method for limiting a swing angle of a jib crane, the jib crane having a jib rotatably mounted to a mast. The device can have a collar having a collar height and a collar width, the collar being configured to be fit to the mast at a stop height. The device can also have one or more stopping tabs enagagable with the collar and configured to be positioned on the collar at one or more points about a circumference of the mast. The stop height can place the one or more stopping tabs in a position coincident with the jib to interfere with the swing angle of the jib. The method can use the device to limit the angle through which the jibe crane can swing unimpeded.

This disclosure provides a system and method for limiting a swing angle of a jib crane, the jib crane having a jib rotatably mounted to a mast. The device can have a collar having a collar height and a collar width, the collar being configured to be fit to the mast at a stop height. The device can also have one or more stopping tabs enagagable with the collar and configured to be positioned on the collar at one or more points about a circumference of the mast. The stop height can place the one or more stopping tabs in a position coincident with the jib to interfere with the swing angle of the jib. The method can use the device to limit the angle through which the jibe crane can swing unimpeded.

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 method for controlling a crane component of a tower crane in proximity of obstacles at a worksite by defining a forbidden volume is disclosed. In the method a distance from the crane component to an outer surface of the forbidden volume is determined and a computing device limits movement of the crane component based on the distance from the crane component to the outer surface of the forbidden volume to avoid entering the forbidden volume with the crane component while the crane is in operation. The crane component is one or more of a boom and a hook block.