Optics: eye examining – vision testing and correcting – Spectacles and eyeglasses – With antiglare or shading
Patent
1995-10-10
1999-03-30
Dang, Hung Xuan
Optics: eye examining, vision testing and correcting
Spectacles and eyeglasses
With antiglare or shading
351 57, G02C 712
Patent
active
058895744
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a clip-on spectacle accessory with rimless clip-on lenses, which are each held by a number of clasps to the spectacle lenses, wherein an upper clasp is directly secured to the top edge of each clip-on lens which at the same time forms the holding means for an elastic bridge to the other clip-on lens, such that the lateral cohesion of both clip-on lenses is determined by the upper clasps and the bridge, and a lower clasp is directly secured to the lower edge of each clip-on lens preventing the clip-on accessory from spreading away from the lenses of the spectacles, wherein the upper and lower clasp of each clip-on lens are outwardly offset with respect to the center line of the clip-on lens.
Such clip-on accessory is known from U.S. Pat. No. 5,123,724. The clasps of this spectacle accessory are formed from clip-ons which are U-shaped and grip the respective clip-on lens on both of its sides. Thereby the clip-ons form a gap between their base and the respective edge of the clip-on lens, in which gap a bridge formed from a rectangular elastic bar is inserted and glued to the spectacle accessory when adapting the spectacle accessory to the spectacles and of the person wearing it. The rectangular elastic bar thereby, as a result, fills the equally practical rectangularly formed gap to such an extent that only a small space must be filled by the glue and therefore the bridge is secured against twisting. Due to the short distance between the legs of the U-shaped clip-ons, a corresponding thickness of the respective clip-on lens is necessary, which must be able to fit into the clip-on as tight as possible, so that its solid mounting into the clip-on is ensured. The U-shaped clip-on in no way enables a later insertion of a clip-on lens thicker than its width. The filling-in of the glue into the above mentioned gap respectively requires each, an exact portioning of the glue while avoiding a smearing of the glue extending beyond the edges of the gap and onto the clip-on lens which, considering the small dimensioning of the respective components, can hardly be achieved, in any case requires extreme attention and accuracy, which in general presents a considerable hindering of a quick and problem-free adaptation, not considering the problem of a subsequent clipping of the parts to be connected while the glue has to harden. Additionally, the rectangular bar forming the bridge complicates its necessary bending during the fitting of the clip-on accessory to the pair of given spectacles, since the bridge at the same time must possibly by bent in the directions, which extend nearly diagonal to the rectangular cross-section of the bridge, whereby the rectangular cross-section of the bar impedes such a bending. A quick and problem-free adaptation of the clip-on accessory and possibly a quick replacement of the clip-on lenses, therefore is not possible with the known clip-on accessory.
A clip-on accessory on the market comprises a metal frame for each clip-on lens onto which for each clip-on lens two clasps are mounted outwardly offset from the center line of the respective clip-on lens, with which the clip-on accessory is attached to the lenses of the spectacles. Both clip-on lenses are connected to each other by means of a bridge formed from a wire respectively ending in a tube which is separately mounted to the frame of the respective clip-on lens.
From DE-Gbm 89 14 048 it is further known to provide individual clip-on lenses which respectively comprise three clasps in a frameless embodiment, with which respectively each clip-on lens is attached to a spectacle lens. A connection between both clip-on lenses for spectacles is not provided. The three clasps are mounted to the clip-on lens either by means of pins penetrating the clip-on lens or are glued to the clip-on lens.
The invention is based on the object of providing a clip-on accessory for spectacles, which is extremely easy to manufacture and which can be put together from pre-formed individual components in accordance to the corresponding spect
REFERENCES:
patent: 5123724 (1992-06-01), Salk
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