| 摘要 |
An eyeglass frame includes a pair of rims in which a corresponding pair of bifocal lenses are mounted, and a pair of temples connected to the respective rims. Each of the temples includes a joint secured to a corresponding one of the rims, a leg having one end connected to the joint and the other end resting behind a wearer's ear, and a mechanism for enabling pivotal movement between the joint and the leg in a vertical plane so as to permit movement of the bifocal lenses between a normal position and an elevated. or reading position. The mechanism is so constructed as to decrease the distance between a first point at which the joint is connected to the rim and a second point at which the joint is connected to the leg when the lenses are moved from their normal to elevated position.
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