Crane

A crane comprising:

• a boom;
• a jib that is attached to the boom so that the jib can be hoisted or lowered;
• a front post that is swingably attached to a tip end side of the boom and linked to the jib via a linking member;
• a rear post that is swingably attached to the tip end side of the boom, wherein a rope for hoisting or lowering the jib is wound between the rear post and the front post;
• a post-side pendant member, with one end of the post-side pendant member being attached to a tip end of the rear post;
• a boom-side pendant member, with one end of the boom-side pendant member being attached to another end of the post-side pendant member, and another end of the boom-side pendant member being attached to the boom;
• and
• a post driving device having a link mechanism that rotates the rear post in a range including a position at which the rear post is swung down to a front post side and a position at which the rear post is swung down to a broom side, while the boom is held down in a horizontal position,
• wherein the post driving device is configured to:
• include an extension/retraction actuator, with one end of the extension/retraction actuator being connected to the rear post;
• be designed so that the rear post rotates in a range including a position at which the rear post is arranged in parallel to the boom by retraction of the extension/retraction actuator and a position at which the rear post is arranged orthogonally to the boom by extension of the extension/retraction actuator;
• and
• when the extension/retraction actuator is extended, the rear post is swung down to the boom side until the one end of the boom-side pendant member attached to the boom and the other end of the post-side pendant member attached to the tip end of the rear post can be attached to each other.