Patent ID: 7012540

Claim:
A mobile work device comprising a vehicle chassis ( 10 ), two forward and two rearward support struts ( 20 ) extendable from a transport position to at least one support position and supportable upon the ground ( 28 ) with respectively one telescopic support foot ( 26 ), a work boom ( 14 ) extendable from a driving position to a work position projecting beyond the vehicle chassis and rotatable about a vehicle chassis-fixed vertical axis ( 13 ), a measurement device ( 30 ) provided in the area of the support feet ( 26 ) for determining the respective support loads and a support stability monitoring device responsive to the output signals of the measurement device, wherein at least one force sensor ( 32 , 34 ) is provided for each support foot ( 26 ), wherein each force sensor is provided in an electrical measurement circuit ( 36 , 38 ) for output of a support load dependent measurement signal, wherein the monitoring device includes an evaluation electronic ( 54 ) which in predetermined sampling cycles evaluates support foot derived support load measurement values for comparison with at least one predetermined stability determining threshold value, and wherein the electrical measuring circuits ( 36 , 38 ) exhibit a measurement precision which decreases going from low to high support foot derived support load measurement values.