US 5,610,668 A · Fog-resistant sunglasses incorporating ventilation channels

Abstract

Protective eyeglasses (e.g., sunglasses) for use in high-speed outdoor sports activities, the lenses thereof being resistant to condensation, is achieved by air circulation created by venturi effects. The glasses comprise a frame front having middle portions over the wearer's eyes which support protective lenses, and having endpiece portions near the wearer's temples, the outboard edges of which attach temples which hold the glasses in place. A chamber is defined by the volume between the lenses and the wearer's face, and gaps are defined by the distance between the middle portions of the frame front and the wearer's face. Apertures in each of the endpiece portions of the frame front define an entrance of a ventilation channel for air flow through the frame front, adjacent to the respective chamber. Venturi forces are created within the ventilation channels to facilitate circulation of air. Improved ventilation, and the reduction or elimination of fogging on the lenses, is accomplished by low-cost and lightweight glasses.

Claims19

Dependent claims

Fog-resistant eyeglasses positionable upon a wearer's face adjacent the wearer's temples for shielding the wearer's eyes, said eyeglasses comprising:

a frame front which spans across the wearer's face, said frame front including a forward side, an aft side, a pair of middle portions positioned over the wearer's eyes, and a pair of endpiece portions positioned adjacent the wearer's temples, each of said endpiece portions defining an outboard edge;
a pair of lenses attached to respective ones of the middle portions of the frame front and positioned over the wearer's eyes, each of said lenses defining front and back surfaces;
and
a pair of apertures disposed within respective ones of the endpiece portions of the frame front, said apertures being forwardly directed and defining ventilation channels for facilitating air flow through the frame front adjacent the lenses;
wherein the ventilation channels defined by the apertures are each sized and configured to create a venturi effect when air flows therethrough which facilitates the circulation of air over the back surfaces of the lenses to resist the fogging thereof.

2 more elements

Dependencies are inferred from the claim text.

Fog-resistant sunglasses incorporating ventilation channels

Life of this patent

Fog-resistant sunglasses incorporating ventilation channels

Life of this patent

Abstract

Claims19