Importance

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Abstract

A working boom with a rotating head on a frame, which rotates about a vertical axis, and boom arms that are each either pivotable or slideable by the use of a drive unit. The working boom includes a control device that controls boom movement with the aid of actuators assigned to each drive unit. Path or angular sensors are assigned to the boom arms, bending axes, vertical axis and/or or drive units. At least one of the drive units includes a hydraulic cylinder with a ground end and a rod-side end. A force or pressure sensor is disposed on the ground end or rod-side end of the hydraulic cylinder. A data storage device receives a pre-set data field of pressure and/or force limit values in connection with a respective path or measurement value assigned to the boom arms, the pre-set data field being analytical or in tabular form. The control device has a safety routine in which a comparator receives output data of the force or pressure sensor and either output data from the path or angular sensors or quantities derived from the output data of the path or angular sensors, and performs a comparison with the data field to trigger a signal if the data from the sensors is outside the limit value data.

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First Claim