| 摘要 |
PROBLEM TO BE SOLVED: To reduce a cost by reducing weight, and to facilitate maintenance/ control by installing a ladder on a construction machine main body through a link mechanism. SOLUTION: One end side upper/lower shafts 13, 14 of a four-node link 12 are fixed to a lower bracket 18 of a side walk 7 of a turning solid 4, and upper/ lower links 15, 16 are respectively rotatably installed on both ends of these shafts 13, 14. The mutual free ends of these upper/lower links 15, 16 are connected by shafts 17, 19, and Ilhe mutual shafts 17, 19 are respectively relatively rotatably connected by a link 20 on both ends. The shafts 17, 19 and a vertical frame 9a of a ladder 9 are connected by upper/lower links 21, 22 for constituting parallel links. That is, one ends of the links 21, 22 are rotatably connected to both ends of the shafts 17, 19, and the other ends of the respective links 21, 22 are respectively relatively rotatably connected to the vertical frame 9a of the ladder 9 by shafts 23, 24.
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