| 摘要 |
PROBLEM TO BE SOLVED: To provide a crane that can prevent a back stop main body thereof from protruding upward with a front strut being stored.SOLUTION: The crane is composed by attaching a front attachment comprising a boom, a jib, a jib derricking device having a front strut 8 and a rear strut and a jib back stop 20 to a crane main body. In the jib back stop 20, a base end portion of a back stop main body 21 is rotatably attached to a support frame 6 for rotatably attaching a base end portion of the front strut 8 to the jib, and on the outside of the support frame 6 are arranged follower levers 26 and 27 for expansion and storage for oscillating and following a cam plate 25 disposed on the front strut 8. Along with the rearward and forward rotation of the front strut 8, the back stop main body 21 is rotated through the cam plate 25 and the follower levers 26 and 27 in the opposite direction of the rotation direction of the front strut 8 to be rotated from a crane operation posture facing toward the boom to a downward storage posture. |
