| 摘要 |
PROBLEM TO BE SOLVED: To smoothly perform assembling working and eliminate looseness between a connection pin and a bracket. SOLUTION: An upper side boss 12 is provided on an upper plate 4D constituting a turn frame 4, and a lower side boss 14 is provided on the front end of a bottom plate 4A. In addition, a swing post 16 arranges an upper side bracket 17 on a more upper side than the upper side boss 12, and the lower side bracket 18 is arranged between the upper side boss 12 and the lower side boss 14. An upper side connection pin 21 is provided to be projected downward on the upper side bracket 17, and slidably fitted to and inserted in an upper side bush 13. In addition, a lower side connection pin 22 is provided to be projected downward on the lower side bracket 18, and slidably fitted to and inserted in a lower side bush 15. Furthermore, a stopper 23 is provided on the upper end of the upper side connection pin 21, and the upper side connection pin 21 is held in the upper side bush 13 in a locked state.
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