A crawler crane (1) includes: a seating switch (42) that detects whether an operator is in a driver seat (3); a turn angle potentiometer (41) that detects the turn position of a boom; and a controller (30) . The controller (30) is provided with a boom turn restriction control unit (40) for performing a boom turn-restricting control whereby the boom is not allowed to turn within a predetermined angular range above the driver seat (3) on the basis of the output from the turn angle potentiometer (41). The boom turn restriction control unit (40) includes a restriction0canceling unit (40B) that cancels the boom turn-restricting control performed by a turn-restricting unit (40A) if a preset restriction-canceling condition is met. The boom turn restriction control unit (40) cancels the boom turn-restricting control if the seating switch (42) does not detect an operator. Ease of operation and work can thus be improved in a remote operation mode and the like.
MOBILE CRANE
MOBILER KRAN
GRUE MOBILE
2022-02-02
Patent
Elektronische Ressource
Englisch
IPC: | B66C Krane , CRANES |
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