| 摘要 |
A front part includes an upper frame and a lower frame, which are formed by bending a wire material, in which the upper frame and the lower frame each have rim pieces formed at both ends of a connecting part, which are retained to each other at the center, and in which wraparound endpieces provided on the outside of the upper and lower rim pieces are connected to each other to be assembled. The upper and lower frames have the wraparound endpieces in which rings are formed on the outside thereof, and temple has also rings formed at ends thereof. The rings are assembled, a shaft is fitted in shaft holes of the rings and is tightened with a screw.
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