| 摘要 |
<p>A pin (14) and an opening (12) in which the pin (14) is fixed have in their cross section straight-line portions and circular arc portions which connect to upper and lower ends of the straight-line portion, respectively. The length LD of the straight-line portion of the pin and the length LL of the straight-line portion of the opening satisfy LL ≧ LD, and the radius RD of the circular arc portions which connect to the upper and lower ends of the pin, and the radius RL of the circular arc portions which connect to the upper and lower ends of the opening satisfy RL < RD.
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