Method of operating a crane
AssigneeLiebherr-Werk Ehingen GmbH
InventorsPeter Abel, Helmut Spaeth
Life of this patent
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Abstract
The present disclosure relates to a method of operating a crane whose safe working load depends on one or more changeable parameters, with the change of at least one of the parameters being made such that the speed of the parameter change is reduced continuously or step-wise before a parameter value is reached at which the safe working load corresponds to the actual working load.
Claims20
A method of operating a crane whose safe working load depends on one or more changeable parameters, comprising:
- changing at least one of the parameters such that a speed of the parameter change is reduced continuously or step-wise and not abruptly, by reducing the speed of the movement of the crane or of a crane component continuously or step-wise, before a parameter value is reached at which the safe working load corresponds to an actual working load.
A method of operating a crane whose safe working load depends on one or more changeable parameters, comprising:
- when an actual working load exceeds the variable safe working load, changing at least one of the parameters during crane operation to bring the actual working load to the safe working load;
- continuously or step-wise reducing a speed of the parameter change and not abruptly, by reducing the speed of the movement of the crane or of a crane component continuously or step-wise, before a parameter value is reached at which the safe working load corresponds to the actual working load;
- and
- reaching the safe working load with the crane in a substantially non-oscillatory condition.
A system, comprising:
- a crane whose safe working load depends on one or more changeable parameters;
- a control system for operating the crane, changing at least one of the parameters during crane operation, and continuously or step-wise reducing a speed of the parameter change and not abruptly, by reducing the speed of the movement of the crane or of a crane component continuously or step-wise, before a parameter value is reached at which the safe working load corresponds to an actual working load, where the speed of the parameter change is reduced continuously or step-wise based on a difference between the actual working load and the safe working load, and the change of the parameter is made such that the actual working load cannot exceed the safe working load.
Dependencies are inferred from the claim text.