Patent ID: 9272883
Filing Date: 2016-03-01
CPC Classification: B66C

Claim Text:
1. A method for operating at least two lifting devices, in particular cranes, in group operation and in normal operation modes, said method comprising: controlling the at least two lifting devices through a common bus, wherein each of the lifting devices comprises a respective electric lifting gear motor with a respective control system that is connected to a respective control switch, wherein the control switches are selectable between normal operation and group operation; preparing for changing from normal operation to group operation by deselecting normal operation at all but a first of the control switches that are in a normal operation, whereby only the first control switch remains in normal operation; logging on to group operation with the first control switch, thereby changing the first control switch to an active state for group operation, wherein the other control switch or switches that are deselected from normal operation are in a passive state in group operation; jointly controlling the at least two lifting devices though the common bus with the first control switch; preparing for changing from group operation to normal operation by deselecting group operation and selecting normal operation at the first control switch; and logging on to normal operation with the other control switch or switches.