Manually variable light filtering sunglasses

Details Manually variable light filtering sunglasses Manually variable light filtering sunglasses

1988-12-27

1990-07-24

Dzierzynski, Paul M.

Optics: eye examining, vision testing and correcting

Spectacles and eyeglasses

With antiglare or shading

351 47, 351 57, G02C 712

Patent

active

049431528

ABSTRACT:
Variable density sunglasses comprise a frame with a pair of rim portions, each rim portion having sidewalls and first and second interior grooves formed therein between the sidewalls. A pair of first lenses are fixed mounted in the first grooves. A pair of second lenses can be threadably mounted into or demounted from the second grooves along thread planes that are defined by access channels, each access channel extending from a second groove to one of the sidewalls. Each second lens has a circular periphery and a cut extending radially inwardly from the periphery to define two thread edges. The thread edges enable the lenses to be inserted into the respective channels for rotational mounting. Once mounted, rotaation of the second lenses within the second grooves allows the density of light passing through the aligned first and second lenses to be varied.

REFERENCES:
patent: 2005426 (1935-07-01), Land
patent: 2251330 (1941-09-01), Fairbank
patent: 2565362 (1951-03-01), Eloranta
patent: 2813459 (1957-05-01), Archambault
patent: 3869200 (1975-03-01), Danylewich
patent: 3944346 (1975-10-01), Shindler
patent: 4102566 (1978-04-01), Shelton
patent: 4119369 (1978-02-01), Eloranta et al.
patent: 4149780 (1979-04-01), Young
patent: 4196982 (1980-12-01), Watkins
patent: 4386832 (1983-07-01), Nannini

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