| 摘要 |
PROBLEM TO BE SOLVED: To provide a turning beam collision prevention device of a crane capable of surely preventing the end of a turning beam from being collided by a simple structure. SOLUTION: This turning beam collision prevention device of a crane comprises a suspension base 20 installed on the end (12) upper surface of a turning beam, a surrounding frame member 30 disposed just above the end 12a, suspended from the suspension base 20 through a suspension rod 42, and swingable in any direction, and a spring rod limit switch 70 detecting the swing of the surrounding frame member 30. The surrounding frame member 30 is so formed as to surround the periphery of the end 12a in a horizontal plane. COPYRIGHT: (C)2008,JPO&INPIT
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