Optics: eye examining – vision testing and correcting – Spectacles and eyeglasses – Continuous rim mounting
Patent
1991-08-26
1993-11-30
Arnold, Bruce Y.
Optics: eye examining, vision testing and correcting
Spectacles and eyeglasses
Continuous rim mounting
351136, 351139, 2446, G02C 100
Patent
active
052669785
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The subject matter of this invention concerns a spectacle frame consisting of a synthetic material with an adhesive coating made of silicone on a portion of its surface, with a primer coating between the adhesive coating and the surface of the spectacle frame serving as a bonding layer.
When spectacle frames made of synthetic materials and having a smooth surface slip are worn or handled, they are very slippery, especially as a result of perspiration, grease, cream, or similar things. It is particularly annoying when the glasses slip downward or sideways whenever the wearer moves his/her the head.
To improve the fit of glasses, German Utility-Model Patent No. 7,916,275 provides for coating the surface of the spectacle frame, to the extent that it comes into contact with the skin, with an adhesive coating of silicone. This silicone film, which is applied onto a primer coating, is very thin and wears off very rapidly.
SUMMARY OF THE INVENTION
Thus, it is the objective of this invention to create a synthetic spectacle frame with good and long-lasting adhesive properties, which will eliminate the possibility that the glasses slip down the nose, which can be extremely annoying to the wearer.
This problem is solved according to this invention by providing flat silicone elements at least in the area of the two pads (lateral nose supports of the spectacle frame) which are held in a depression of the spectacle frame so as to be flush with the edge. The silicone element is formed by filling silicone into a depression of the spectacle frame until this depression is full to the brim.
Wear tests with this type of glasses have confirmed the suitability of the silicone element as a solution of the problem defined above as well as its extraordinarily long durability. Special investigations as to sensitivity to perspiration, allergies and adhesive strength invariably yielded positive results. It proved to be sufficient to limit application of the adhesive coating to the two nose pads of the spectacle frame.
After molding the depression into the spectacle frame, a primer coating is applied. Only then is the depression filled to the brim with viscous silicone until the silicone, due to its surface tension, forms a slight curvature toward the outside. As a result of the flush design of the silicone element, which is further improved by an edged beading which surrounds the depression, the silicone element is protected against mechanical damage, e.g., scratches. Also, the possibility of a partial separation of the silicone element is avoided.
The attached drawing illustrates one particular practical example of this invention.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 shows the front of a spectacle frame on the inside as seen by the wearer.
FIG. 2 shows a top view of a nose pad of the spectacle frame, and
FIG. 3 shows a longitudinal cross section through the nose pad along line III--III of FIG. 2.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
In the view of spectacle frame 1 from the inside as shown in FIG. 1, the two silicone elements 3 which form the nose pads of the frame are shown.
FIGS. 2 and 3 show an enlarged representation of the nose pad area of spectacle frame 1. After cleaning depression 2 with alcohol and allowing it to dry, a primer coating (not shown in the drawing) is applied with a brush to depression 2 which, for this purpose, is held in an approximately horizontal position. After the primer coating is dry, silicone element 3 is produced, preferably by means of a cannula, by filling depression 2 to the brim [with silicone]. Subsequently, the viscous silicone is allowed to cure at room temperature.
The silicone may, of course, also be applied by means of a metering device. The convex form of the silicone element 3 depends on the viscosity of the silicone used and is thus controllable. The application area is defined by depression 2 and its edged beading 4. This edged beading results from a material displacement during the molding of depression 2 by means of a metal punch a
REFERENCES:
patent: 4375911 (1983-03-01), Bononi
patent: 4802754 (1989-02-01), Neef
Kaszmann Herbert
Steeb Hermann
Arnold Bruce Y.
Dang Hung Xuan
Ferdinand Menrad GmbH & Co. KG
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