Patent ID: 7657355

Claim:
A device for operating an articulated boom ( 22 ) of a concrete placement boom ( 14 ) linked to a boom block ( 21 ), of which the articulated boom includes at least two boom arms ( 23 through 27 ), which are respectively limitedly pivotable relative to the boom block ( 21 ) or an adjacent boom arm about respective parallel horizontal articulation axes ( 28 through 32 ) via hydraulic drive units ( 34 through 38 ), the device comprising: a remote control element ( 50 ) for transmission of control signals and a receiver ( 70 ) and micro-controller ( 74 ) for receiving said control signals for boom movement with help of actuator elements ( 80 through 84 ) associated with the individual drive units ( 34 through 38 ), the micro-controller including a position controller ( 92 ), and sensors ( 96 ) associated with the individual boom arms, articulation axes and/or drive units for measurement of path or angle for the position controller ( 92 ), wherein the drive units ( 34 - 38 ) are supplied with hydraulic fluid via a common supply line ( 104 ), wherein a supply valve ( 106 ) is located in the common supply line ( 104 ), and wherein the micro-controller ( 74 ) includes a computer readable memory on which a safety program ( 100 , 100 ′) is recorded, said safety program being responsive to output data of the sensors ( 96 ) for controlling the supply valve ( 106 ) depending upon a value of a predetermined safety criteria, wherein the safety program ( 100 ′) includes an evaluation component, which is responsive to the switch-on condition (SV) of the supply valve ( 106 ).