Optics: eye examining – vision testing and correcting – Spectacles and eyeglasses – With auxiliary lenses movable in and out of the optical path
Patent
1996-07-18
1998-03-03
Mai, Huy
Optics: eye examining, vision testing and correcting
Spectacles and eyeglasses
With auxiliary lenses movable in and out of the optical path
351 47, G02C 708
Patent
active
057241180
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention relates to a device for attaching supplementary lenses to spectacles with two flexible, closed rings which hold the supplementary lenses, a bow which joins the rings, and with hooks for fixing the device to the spectacles.
These device which are also called clip-on lens attachments are known in various versions.
2. Description of the Prior Art
Thus for example metal clip-on lens attachments are known. These clip-on lens attachments however have the disadvantage that they are suited only for spectacles of a quite specific shape, since they can only hold supplementary lenses which have a certain outline and since attachment of the clip-on lens attachment in spectacles shaped differently from the spectacles for which it is intended is not possible with the required safety.
Clip-on lens attachments are also known which have two plastic disks which are interconnected via a metal clasp which can be clipped to the frame of the spectacles. Since the disks are made of plastic, it is possible to cut or grind them according to the outline of the spectacles to which the clip-on lens attachments are to be clipped.
One disadvantage of the latter known embodiment of clip-on lens attachments is that cutting to size is usually done by hand and not with the required accuracy, so that an unattractive appearance results, and that the clip-on lens attachment is fixed only on the upper edge of the frame of the spectacles so that holding is not reliable.
FR-A-1 036 891, U.S. Pat. No. 1,909,796, FR-A-987 858 or FR-A-1 095 500 disclose clip-on lens attachments and spectacles with rings which are closed in themselves and which consist of flexible material so that they can be adapted to different shapes of spectacle lenses.
SUMMARY OF THE INVENTION
The object of the invention is to further develop a device of the initially mentioned type such that with a single embodiment supplementary lenses with outlines which correspond to current spectacle shapes can be attached to spectacles.
According to the invention this is achieved by the rings being of variable length for the supplementary lenses for purposes of shortening their peripheral length.
Because in the invention flexible, and at least for purposes of shortening their periphery, rings of variable length are used, the rings can be not only accurately matched to the shape of the supplementary lenses, but they can also surround them reliably so that the supplementary lenses are easily securely held regardless of their outline.
Due to the invention, devices with one ring size or at most two ring sizes for most spectacles on the market will be available.
In the invention the rings consist for example at least partially of a material which is preferably rubber elastic, which is elastic in length and/or which shrinks under the action of heat so that the supplementary lens can be attached by the rings abutting the supplementary lens by shrinking and/or elastically, and in doing so by their assuming a shape which corresponds to the outline of the supplementary lenses.
In the invention, as mentioned previously, the rings need not consist entirely of a material which shrinks lengthwise and/or which is elastic in length, but it is enough that at least one part of the material of the ring shrinks under the action of heat and/or is elastic. It is enough if the remaining part of the material which comprises the ring is flexible so that it can adapt itself to the outline of the supplementary lenses which are cut to the shape of the lenses of the spectacles.
The invention is not limited to a certain type of supplementary lenses. All supplementary lenses which are used for clip-on lens attachments, regardless of whether of glass or synthetic glass, whether tinted or polarizing, or which color under the action of light, can be attached using the device according to the invention.
In one practical embodiment of the invention it is provided that the rings are attached to the ends of the bow. In this version it is preferred if the
REFERENCES:
patent: 1620569 (1927-03-01), Quick
patent: 1909796 (1933-05-01), Anderson
patent: 1971055 (1934-08-01), Shindel
patent: 2065458 (1936-12-01), Hines
patent: 2538692 (1951-01-01), Lindblom
patent: 2678584 (1954-05-01), Eyles
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