| 摘要 |
PROBLEM TO BE SOLVED: To simply and surely perform connection and assembling of front attachments of a crane.SOLUTION: Mutual connection object components of an inner gib 2, a front strut 3, and a rear strut 4 are unitized to a boom 1 being a front attachment of a crane. Unitization is performed by connecting an end part of the front strut 3 to a frame 16 fixed to a base end part of the inner gib 2, and connecting an end part of the rear strut 4 to a frame 15 connected to the base end part of the inner gib 2 to be rotatable. After an engagement shaft part 20 provided at an end part of the rear strut of a unitized connection object component I is engagedly connected to an upper connection part UJ of a tip part of the boom 1, the connection object component I is rotated centering on an engagement part, and the inner gib base end part is positioned to a lower connection part DJ of the boom tip part to be connected. |
