| 摘要 |
PROBLEM TO BE SOLVED: To easily execute the mounting/demounting work of a working machine without requiring skillfulness. SOLUTION: On either of a main machine side hitch 7 and a working machine side hitch 10, a boss part having a boss hole for inserting a connecting pin is provided so as to direct the axis in the right and left directions, meanwhile the other hitch is provided with a positioning engaging piece formed recessedly rearward so as to engage with the outer circumferential face of the boss part, and a connecting pin hole coincide with the boss hole of the boss part engaged with the positioning engaging piece, connecting pins 20, 21 are inserted through coincided both holes, to make both hitches connectable. In addition, a plurality of the set of the boss part, a positioning engaging piece, and the connecting pin hole are provided spacedly in the vertical direction.
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