Optics: eye examining – vision testing and correcting – Spectacles and eyeglasses – Rimless mounting
Reexamination Certificate
2002-05-23
2003-12-02
Dang, Hung Xuan (Department: 2873)
Optics: eye examining, vision testing and correcting
Spectacles and eyeglasses
Rimless mounting
C351S041000
Reexamination Certificate
active
06655800
ABSTRACT:
BACKGROUND OF THE INVENTION
(1) Field of the Invention
This invention relates to a lens connecting device and a method of connecting lens for rimless glasses, what are called two-point glasses, in which end portions of a bridge or end portions of temples are connected to lenses.
(2) Prior Art
In the rimless glasses what are called two-point glasses, right and left plastic lenses are connected to each other with a bridge at inside edges of the lenses and an end part of each of brackets is connected to each of outside edges of the lenses. Generally, a connecting device of the lenses of the rimless glasses what are called two-point glasses was conventionally structured as follows.
Namely, as shown in
FIGS. 49 and 50
, a connecting section (a) was structured so that a curved contact element (c) for a detent function being in contact with a lens flank (b) was brazed to an end of a main body (d) of the connecting section, and a connecting element (f) was brazed to the contact element (c). The connecting element (f) projected toward a center of a lens and had a through opening (e) at an end of the projection thereof. In order to connect the connecting section (a) of such a structure to a lens (g), as shown in
FIG. 50
, a connecting screw (k) was inserted into a connecting opening (h) provided in the lens (g) from one end of the connecting opening (h) via a resin washer (j). Then the resin washer (j) was mounted to a screw shaft (m) of the connecting screw (k) projecting from the other end of the connecting opening (h), and a nut (n) was screwed down to an end of the screw shaft (m) projecting from the resin washer (j), by which the connecting section (a) was fixed to the lens (g). In that state of fixing, detent of the connecting section (a) was obtained by an engaging effect of the contact element (c) which was in contact with the lens flank (b).
However, according to the above-mentioned conventional connecting structure, it was necessary to bore the connecting opening (h) in the lens (g) after accurately determine a position of the connecting opening (h) according to a distance between the contact element (c) and the through opening (e). If the connecting opening (h) is formed too close to the edge of the lens (g), the contact element (c) can not be in contact with the lens flank (b) properly, whereby the contact element (c) does not work as a detent as required, and there arises a problem of shakiness in the connecting structure. To the contrary, if the connecting opening (h) is too far from the edge of the lens (g), there arises a problem that a position of the through opening (e) can not match the position of the connecting opening (h) while keeping the contact element (c) in contact with the lens flank (b). In both cases, required connection could not be attained.
To solve the above-mentioned problem, rimless glasses without the above-mentioned contacting element (c) is presented under Japanese Utility Model Registration No. 3003032.
As shown in
FIG. 51
, the rimless glasses was structured in such a manner, for example, that a through opening (r) was provided in a connecting section (q) being an end portion of a bracket (p), and each of engaging projections (s), (s) was mounted to each of upper and lower parts of the through opening (r) for a purpose of detent. Further, a connecting opening (h) was provided at the edge part of the lens (g) so that a position thereof could match a position of the through opening (r). Furthermore, on each of the upper and lower parts of the connecting opening (h), each of fixing openings (t) and (t) was provided. In order to connect the connecting section (q) having the above-mentioned structure to the lens (g), each of the upper and the lower engaging projections (s), (s) was put into each of the upper and lower fixing openings (t), (t). Next, from one side of the lens, a connecting screw (u) was inserted into the through opening (r) and the connecting opening (h), which were continued to each other. Then, a washer (v) was mounted to a screw shaft of the screw (u) projecting from the other side of the lens, and a nut (w) was screwed down to the screw shaft projecting from the washer (v), by which the bracket (p) could be connected to the lens (g) while keeping a detent function.
The rimless glasses according to the above-mentioned structure had an advantage that when the connecting opening (h) was made in the lens (g), the connecting section (q) could be connected to the lens (g) as required even if the boring position of the opening (h) deviated a little in a direction of width of the lens as far as the upper and lower fixing openings (t) (t) were made properly as required, because the rimless glasses did not have the contact element (c) for a purpose of detent.
As another embodiment of rimless glasses without the contact element (c), Japanese Patent Laid-Open No. 7-218870 is presented. The rimless glasses were structured in a manner that a square-shaped opening was formed at a edge part of a lens, into which a square-shaped cylinder was inserted, which cylinder was mounted, for instance, onto the end of a bracket to project. Then the square-shaped cylinder was connected to the lens by using a connecting screw and a nut in a state of having detent function.
The rimless glasses according to the above-mentioned structure had an advantage that when the square-shaped opening (h) was made in the lens, the connecting section could be connected to the lens in a state of having a detent function as required, even if boring position of the square-shaped opening deviated a little in a direction of width of the lens because the rimless glasses did not have the contact element (c) to function as a detent.
However, according to the above-mentioned Japanese Utility Model Registration No. 3003032, it was very difficult to form the upper and lower fixing openings (t), (t) after determining positions thereof so that the upper and lower fixing openings (t), (t) can precisely fit to the upper and lower engaging projections (s), (s) mounted to the connecting section in consideration of a direction of sideways projection of the bracket (p) from the lens. That was because a surface of the connecting element (q) to be in contact with the lens surface had to be formed to make a curving surface according to a curve of the lens so that the surface of the connecting element (q) can be in contact with the lens surface. That was also because the upper and lower fixing openings (t), (t) provided in the lens also had to be bored in consideration of the curve of the lens, in view of the upper and lower engaging projections (s), (s) being formed to project so as to form a right angle to the curving surface,. Consequently, such an uneconomical events occurred that expensive lenses became inferior goods due to wrong boring of the fixing openings.
In the meantime, in the rimless glasses according to the above-mentioned Japanese Patent Laid-Open No. 7-218870, as the opening for connecting the connecting section of the bracket or the like to the lens was not a simple circular-shaped opening but a square-shaped opening, the square-shaped opening was not be able to be easily formed by a drill wherefore a special tool was required. Further, the square-shaped opening had to be bored by precisely fixing a direction thereof so as to precisely set up a direction of outward projection of the bracket or the like vis-à-vis the lens. The boring work required skills and could not be done easily at retailers.
SUMMARY OF THE INVENTION
The present invention has been developed in view of the above-mentioned problems. A purpose of the present invention is to provide a lens connecting device and a method of connecting lens for rimless glasses, which are not equipped with a contact element to work as a detent, in which an opening for purpose of detent can be precisely and easily formed with a lens by means of late working processes.
In order to solve the above-mentioned problems, this invention adopts the following means.
Namely, according to this invention, in a lens connecting device for rimles
Kori Yukiko
Takeda Kinji
Dang Hung Xuan
Holt William H.
Kabushiki Kaisha Takeda Kikaku
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