| 摘要 |
PROBLEM TO BE SOLVED: To solve such problems that poor the production efficiency is poor because the brazing surfaces of hinge pieces are large, and in addition, that the turning of temples become too loose during the course of use. SOLUTION: A connecting mechanism 3 has an annular body 3a which is projectingly disposed on a coupler 2a side of an endpiece 2 and a projecting body 3b projectingly disposed on a coupler 4a of the temple 4. The annular body 3a has at least a turning slit 3a2 formed in a horizontal on its peripheral surface. The projecting body 3b has a metallic mounting ring 3b1 having a connecting hole 3b5 on its outer peripheral surface, a flange part 3b2 disposed on the under surface (base surface) side of the mounting ring 3b1, a bushing ring 3b3 aligned to the top surface of the mounting ring 3b1 and a shaft plug bushing 3b4 projectingly disposed atop the flange part 3b2. The mounting ring 3b1 is inserted from the turning slit 3a2 of the annular body 3a and is aligned into the annular body 3a. The shaft plug bushing 3b4 concentrically pivotally supports the mounting ring 3b1 and the bushing ring 3b3.
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