| 摘要 |
<p>PROBLEM TO BE SOLVED: To reduce a width of a gantry forming a boom corrugation device in a construction machine.SOLUTION: The gantry has a front leg member 210, a rear leg member, and a lower spreader 230. The lower spreader 230 has lower sheaves 231a to 231f supported by a support shaft 231. On an upper spreader, an upper sheave is provided. A corrugation rope is hooked to the lower sheave 231b at first and hooked to the lower sheave 231f at last to be extended toward a fixing end side. To the lower sheaves 231a, 231c to 231e and the upper sheave, the corrugation rope is alternately hooked. By the structure, a width of the lower spreader 230 becomes smaller than that of the front leg member 210.</p> |
