| 摘要 |
PROBLEM TO BE SOLVED: To ensure the strength of a boom and improve the working property of piping by extending an angle rib fixed to the tip of the boom in the boom base end direction along the upper back surface of the boom, and arranging a bucket cylinder hydraulic hose arranged within the boom through the opening of the extension part. SOLUTION: An angle rib 50 formed by bending a sheet member is fixed to the tip of a boom 6, and the angle rib 50 is extended toward the base end of the boom 6 to form an extension part 50a along the inside surface of the upper back surface 6e of the boom 6. A substantially circular opening allowing the communication between the inside and outside of the boom 6 is formed on the extension part 50a of the angle rib 50, and a working machine driving bucket cylinder hydraulic hose 21 arranged within the boom 6 is connected to a bucket cylinder 9-side hydraulic piping through the opening. A cover 55 is attachably and detachably mounted on the opening from the outside. According to this, the boom strength can be ensured, and the hydraulic hose 21 arranged within the boom can be maintained through this opening.
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