| 摘要 |
PROBLEM TO BE SOLVED: To provide an upper limit position stopping mechanism capable of accurately stopping a heavy article suspended through a sheave at an upper limit position. SOLUTION: The upper limit position stopping mechanism 30 stopping the heavy article 2 at the upper limit position comprises a top sheave 9 provided at a tip end of a boom 8 and to which wire rope 10 is guided, a winch 11 lifting/lowering the heavy article 2 by the wire rope 10, a rotating arm 34 capable of rotating about a rotation shaft 32 of the top sheave 9, a dog 38 fixed near a tip end of the wire rope 10 and capable of abutting on the rotating arm 34 when winding up the wire rope 10, and a limit switch 40 detecting rotations of the rotating arm 34. The winch 11 stops when the limit switch 40 detects the rotations of the rotating arm 34 at the time of winding-up of the wire rope 10. COPYRIGHT: (C)2008,JPO&INPIT
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