Optics: eye examining – vision testing and correcting – Spectacles and eyeglasses
Patent
1997-12-19
1999-11-16
Mai, Huy
Optics: eye examining, vision testing and correcting
Spectacles and eyeglasses
351 63, 351119, 351153, 16228, G02C 508, G02C 514
Patent
active
059844710
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a spectacles frame comprising a frame body, two side arms, means for fixing two spectacles lenses to said body, and means forming housing, arranged in an upper portion of the body. The side arms are capable of being at least partially inserted in these housing means in order to adopt a position of rest in which they extend above the locations of the two lenses and of being extracted therefrom in order to adopt a position of use in which they extend in a direction substantially perpendicular to the mean plane of this body. These side arms are flexible and each present a front end and a rear end respectively close to and remote from the frame body in position of use.
The mean plane of the frame body is substantially vertical when the user is wearing the spectacles. In general, the different positions and directions of the various elements of the frame (front, rear, vertical, horizontal) are those of the normal conditions of wear of the frame, in which the lenses are overall vertical, while the side branches are overall horizontal up to the wearer's ears.
European Patent Application No. 0 354 051 discloses a frame of this type, in which the housing means are constituted by two parallel channels, each receiving one of the side arms and formed in the upper bar of the frame. Even if it is attempted to endow the side arms and the tubes with sections which are as reduced as possible, the total dimensions of the housing means are relatively large and the upper bar must consequently be sufficiently thick. Furthermore, the two tubes being parallel, the exits of the two side arms are also parallel and are consequently not aligned in the general direction of the upper bar of the frame. This results in a dissymmetry since the points of connection of the side arms to the frame cannot be located at the same level, either horizontally or vertically. This document also suggests using a single tube, without showing any embodiment with one single tube. Anyway, due to the geometry of the side arms, such a tube would be rather thick and the insertion of the side arms in this tube would be difficult, because they would abut one against another.
The whole is therefore relatively unsightly, due both to the considerable thickness of the upper bar of the frame and to the dissymmetry.
It is an object of the invention to overcome these drawbacks by reducing the thickness of the upper bar of the frame and by making a perfect outer symmetry.
This object is attained thanks to the fact that the housing means are constituted by a single tube adapted to receive the two side arms, this tube being arranged in the upper portion of the frame body, extending, in a so-called "transverse" direction, above the locations of the two lenses, and presenting two open opposite ends, respectively located at a first and at a second lateral end of the upper portion of the frame body, and that the front ends of the side arms are tapered, said side arms being capable of folding across each other in order to be inserted both in said single tube.
The fact of replacing the two tubes of the prior art by a single tube makes it possible to reduce the thickness of the upper portion of the frame since, even if the internal section of the single tube is slightly greater than that of one of the two tubes of the prior art, the thickness of the wall of the tube is found only twice in the section of the upper portion of the frame, whatever the direction considered in this section. On the other hand, in the prior art, in the direction in which the two tubes are juxtaposed, four times the thickness of a tube, in addition to the dimensions of the internal sections of the tubes in this direction, had to be housed.
The two side arms having to be inserted in opposite directions inside the same tube, there is a risk that they mutually hinder each other or even that the insertion is completely blocked if the front ends of the two side arms come into abutment contact with each other. This risk is eliminated thanks to the fact that, according to the
REFERENCES:
patent: 2753762 (1956-07-01), Dorgelys
patent: 4887896 (1989-12-01), Akagi
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