| 摘要 |
PROBLEM TO BE SOLVED: To prevent crane jib separation at the time of being housed. SOLUTION: A crane device 1 is equipped with a jib 3 extending from the forefront of a boom at the time of service and housed in the condition parallel with and close to the boom 2 by a mounting and removing device when out of service, wherein the mounting and removing device 4 is composed of an engaging mechanism 41 and a member 42 to be engaged installed separately on the boom 2 side and jib 3 side, and the engaging mechanism 41 has an engaging member 44 to perform the mounting and removing motions on/from the member 42 to be engaged, while the jib 3 is furnished with a mounting and removal restricting member 6 to be located so as to restrict the mounting and removing motions of the engaging member 44 with the housing motion of the jib 3.
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