The present invention relates to a method for weathervaning of a crane which has a boom which can rotate about a vertical axis, a slewing gear motor and a slewing gear service brake for securing the boom in a rotational position with a securing torque in the crane mode, wherein in the case of a crane which has been out-of-operation, the boom is braked against rotation with an out-of-operation mode braking torque which is less than said securing torque in the crane mode. In this respect, the invention also relates to such a crane itself, in particular in the form of a revolving tower crane. In accordance with the invention, the out-of-operation mode braking torque is kept at least approximately constant over the range of the speed of rotation and over the range of the angle of rotation of the boom.

The present invention relates to a method for weathervaning of a crane which has a boom which can rotate about a vertical axis, a slewing gear motor and a slewing gear service brake for securing the boom in a rotational position with a securing torque in the crane mode, wherein in the case of a crane which has been out-of-operation, the boom is braked against rotation with an out-of-operation mode braking torque which is less than said securing torque in the crane mode. In this respect, the invention also relates to such a crane itself, in particular in the form of a revolving tower crane. In accordance with the invention, the out-of-operation mode braking torque is kept at least approximately constant over the range of the speed of rotation and over the range of the angle of rotation of the boom.

The invention relates to a mobile concrete pump (10) having a chassis (12) which has extendable supporting legs (14), and a concrete distributor mast (18), which is arranged on a slewing mechanism (16) of the chassis (12) such that the concrete distributor mast can be slewed and the inclination thereof can be adjusted by means of an actuating cylinder (22), and which comprises multiple pivotable mast arms (20), and a computing unit for carrying out a stabilization calculation by using the vertical and/or horizontal forces on at least two supporting legs (14), and having a control device which is configured, depending on stability check, to delimit a slewing movement on the slewing mechanism (16) and/or a pivoting movement of at least one mast arm (20.1, 20.2 20.3) and/or the initiation of a pumping operation.

The invention relates to a mobile concrete pump (10) having a chassis (12) which has extendable supporting legs (14), and a concrete distributor mast (18), which is arranged on a slewing mechanism (16) of the chassis (12) such that the concrete distributor mast can be slewed and the inclination thereof can be adjusted by means of an actuating cylinder (22), and which comprises multiple pivotable mast arms (20), and a computing unit for carrying out a stabilization calculation by using the vertical and/or horizontal forces on at least two supporting legs (14), and having a control device which is configured, depending on stability check, to delimit a slewing movement on the slewing mechanism (16) and/or a pivoting movement of at least one mast arm (20.1, 20.2 20.3) and/or the initiation of a pumping operation.

A safety device for a mobile crane has: a permitted work range setting unit that, in accordance with whether or not the overhang angle of each outrigger is a reference overhang angle and the overhang length is the maximum overhang length, sets the permitted work range/non-permitted work range of a crane boom; and a load-specific work range setting unit that, in accordance with whether or not each of the outriggers overhang lengths is a maximum overhang length, sets a maximum RTL work range which is a range, within the permitted work range, in which crane work at a maximum rated total load can be carried out. The crane work capacity on the side of the outrigger having the maximum hangover length with high supporting capacity can be fully utilized within a range over which safety can be ensured.

A safety device for a mobile crane has: a permitted work range setting unit that, in accordance with whether or not the overhang angle of each outrigger is a reference overhang angle and the overhang length is the maximum overhang length, sets the permitted work range/non-permitted work range of a crane boom; and a load-specific work range setting unit that, in accordance with whether or not each of the outriggers overhang lengths is a maximum overhang length, sets a maximum RTL work range which is a range, within the permitted work range, in which crane work at a maximum rated total load can be carried out. The crane work capacity on the side of the outrigger having the maximum hangover length with high supporting capacity can be fully utilized within a range over which safety can be ensured.

An obstacle detection device detects an obstacle existing in one or more monitoring areas that are set to correspond to a movable part. A state determination unit determines whether a state of the actuator is a standby state or a suspended state under circumstances where the actuator is at a stop. On determination that the state of the actuator is the standby state, a display control unit executes automatic image output that is processing for causing a display device to display a monitoring image corresponding to a monitoring area in which the obstacle is detected out of the one or more monitoring areas. On determination that the state of the actuator is the suspended state, the display control unit stops the execution of the automatic image output.

An obstacle detection device detects an obstacle existing in one or more monitoring areas that are set to correspond to a movable part. A state determination unit determines whether a state of the actuator is a standby state or a suspended state under circumstances where the actuator is at a stop. On determination that the state of the actuator is the standby state, a display control unit executes automatic image output that is processing for causing a display device to display a monitoring image corresponding to a monitoring area in which the obstacle is detected out of the one or more monitoring areas. On determination that the state of the actuator is the suspended state, the display control unit stops the execution of the automatic image output.

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.