| 摘要 |
PROBLEM TO BE SOLVED: To provide a structure which always applies optimum frictional resistance so that even if a screw for the rotary shaft of a spring hinge is loosened, a temple does not loosely move. SOLUTION: The structure of the spring hinge is characterized in that a partial circumference part (25c) of a hinge barrel (20) on a press-contacted side has a radius (R1) of 0.8 to 1.3 mm within a range of about 90°from the folded-up state to the expanded state of the temple and the partial circumference part (25c) of the hinge on the press-contacted side and/or a rotary shaft part (40) is always properly applied with frictional resistance by a member on a press-contacting side using a spring in a preliminarily tensed state when the temple is in a stop state of spreading/opening-closing and even when the temple is rotated. COPYRIGHT: (C)2007,JPO&INPIT
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