| 摘要 |
PROBLEM TO BE SOLVED: To provide a crane device that prevents an input error of an operator to reliably operate an overload prevention device.SOLUTION: A boom 4 includes an auxiliary sheave attachment portion 11 for attaching an attachment bracket 13 having an auxiliary sheave 12. The boom 4 further includes a jib holding portion 9 for holding a jib 8 to be used in extending an operation range. When the jib 8 is held by the jib holding portion 9, the auxiliary sheave 12 cannot be attached to the auxiliary sheave attachment portion 11. At the start of operation, the number of sheaves is input to calculate the allowable maximum load. When the jib 8 is held by the jib holding portion 9, input of a predetermined number or more of sheaves is limited. |
