| 摘要 |
PROBLEM TO BE SOLVED: To enhance reliability by inhibiting operations in the widely opened state of a door and preventing a door collision accident etc. SOLUTION: A cab 25 is provided with a door switch 47 which permits mechanical operations to be performed by an undercarriage 2, a working device 5, etc. in the state of making the door 37 closed at an angle of opening, smaller than a predetermined degree of opening, and which outputs a door opening signal for stopping the mechanical operations, when the door 37 is opened to the predetermined degree of opening. Thus, since the door 37 does not interfere with a surrounding obstacle in the closed or slightly opened state of the door 37 of the cab 25, the mechanical operations can be performed. On the other hand, since the door 37 may interfere with the surrounding obstacle by protruding from a slewing radius in a state in which the door 37 of the cab 25 is opened to the predetermined degree of opening, the door switch 47 can output the door opening signal, so as to stop the mechanical operations and prevent damage to the door 37, etc. COPYRIGHT: (C)2009,JPO&INPIT
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