PURPOSE: To prevent widening of an opening fringe part and breakage by contacting reinforcing rings on both outsides of the opening fringe parts of a through hole for inserting a shaft member to joint fiber reinforced plastics members, and trying a widening prevention means between the reinforcing rings.
CONSTITUTION: Through holes 11a, 12a are respectively formed on link members 11, 12 made of fiber reinforced plastics for being inserted through with a pin 13, and metallic reinforcing tubes 14, 15 forming flange-like reinforcing ring parts 14a, 15a contacting with the opening fringe parts of the link members 11, 12 are fitted in the holes. The pin 13 is rotationally movably inserted through these reinforcing tubes 14, 15 to joint the link members 11, 12. Hereby, widening of the fringe parts of the through holes 11a, 12a of the link members 11, 12 and breakage can be prevented.
SHINOBU MASAYASU
SHIINA YOICHI
