| 摘要 |
PROBLEM TO BE SOLVED: To mute an acoustic apparatus mounted on a work vehicle by the operator without requiring much labor. SOLUTION: The mute circuit 1d of a radio is connected to a point A between an electromagnetic solenoid 7 and a lock switch 6 of a lock mechanism part 4 through a mute switch 2. When the mute switch 2 is turned off, the mute circuit 1d is in a non-operating state irrespective of whether the lock switch 6 is turned on or off by the operation of the lock lever 5. When the mute switch 2 is turned on, the mute switch 6 is turned off by the operation of the lock lever 5, and when the work vehicle is in an operable state, the mute circuit 1d is in a non-operating state. However, when the mute switch 6 is turned off by operating the lock lever 5, and the work vehicle is brought into a locked state, the mute circuit 1d is operated and the radio 1 is brought into a mute state since the earth terminal of the mute circuit is earthed. COPYRIGHT: (C)2008,JPO&INPIT
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