| 摘要 |
An eyeglass construction characterized by having a conventional frame with a pair of rim supports for receiving and holding a pair of lenses. The rim supports have a plurality of fixed prongs distributed around the rims at points that are remote from a bridge that connects the tops of the two rim supports. Affixed to the frame, usually near the bridge, is a retaining mechanism that includes a housing having two open ends. A wire-like member is adapted to protrude out of each of the two open ends of the housing for a distance which is adequate to cooperate with the fixed prongs for firmly holding the lenses in the rim supports. Whenever it is desired (or necessary) to replace one or both of the lenses, the appropriate wire-like member is retracted into the housing, such that the adjacent lens may be manipulated-usually by slightly rotating it-in order to free it from the rim support. The wire-like retaining member is biased in its extended position by a bias member having the characteristics of a spring. In the preferred embodiment, the wire-like retaining member and the bias member are integrally formed from the same piece of wire. One end of such a combination member may also be configured to engage some irregularity in the housing (such as an aperture), so that it may function as a positive lock to preclude accidental movement of the wire-like member. With such a lock, a given lens will be removable from the frame only it is desired to replace it with another lens, which other lens may be a different color or shade, etc. The preferred design for the latching mechanism will only permit one lens to be removed at a time, so that a second lens does not accidentially fall to the ground and get scratched while the owner is concentrating his or her attention on replacing a first lens.
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