JPH11231265A - Rimless spectacles - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a holding member such as a bridge, a wrap-around lug, a lens stopper from rotating about a lens without using an abutting plate which abuts against a lens edge surface for the lens holding member and to provide rimless spectacles having a lens holding structure which hardly breaks a lens in wearing and taking-off the spectacles. SOLUTION: Rimless spectacles have an engagement shaft 11 at the lens holding position of a lens holding member 2 such as a bridge and a temple and also has a through hole 15 having such a sectional shape that is stops the lens 1 from rotating by engaging the engagement shaft on the side of the lens 1 corresponding to the engagement shaft, and the lens holding member 2 and lens 1 are fixed by interposing an elastic cushion material 14 between the engagement shaft and through hole; and a stress applied to the lens when the spectacles are put on or off is reduced with the elastic force of the cushion material.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to frameless eyeglasses constituted by fixing a bridge and a temple directly to a lens without using a frame structure, and more particularly to a frameless eyeglass using a holding method called two-point or three-piece. The present invention relates to a lens holding structure for spectacles.

[0002]

2. Description of the Related Art In a method for holding a lens in frameless eyeglasses,
There is a so-called two-point or three-piece method (hereinafter, referred to as a three-piece method) in which a through hole for a screw is formed in a lens and a screw is inserted through the hole and stopped.

In the three-piece method, a small hole is formed near the left and right peripheral edges of the lens, and the small hole is used to fix a lens to a lens holding member such as a bridge, a yoke, and a lens stopper. In order to prevent the screwed holding member from rotating with respect to the lens, it is common to use a lens rotation stopping mechanism that supports the contact plate provided on the lens holding member against the lens edge surface. In this method, in order to prevent the lens from being loosened between the holding member and the lens, it is necessary to accurately form a hole at a predetermined position from the lens edge surface, and the processing yield is low, and a high level of skill is required. I was

Further, the lens holding member used in this method is formed by brazing a holding plate to the holding member and brazing a yoke to the holding plate. As described above, the productivity is poor because a plurality of small parts are brazed, and further, when the degree of opening of the temple is adjusted, there is a case where the brazing occurs at the brazing part and the brazing is broken.

Japanese Unexamined Patent Publication No. 7-234383 discloses a device which does not use a backing plate in order to solve such a problem. The invention described in this document is to fix the rectangular cylindrical body to the tip of the lens holding member, and drill and fit the square hole engaged with this into the lens so that the lens holding member does not rotate with respect to the lens. In this case, since the contact plate for contacting the edge of the lens is omitted, the number of processing steps for the temple and the like can be reduced, and the risk of breakage can be reduced.

More specifically, as exemplified in FIG.
A prism is swelled at the bridge member or at the connection between the temple and the lens, and a through hole is formed at a corresponding position of the lens. A connecting hole is formed by closely inserting a resin cylinder having a cross-sectional shape corresponding to the prism into the through hole. A prism is inserted into the connection hole formed by the resin cylinder, and a nut protruding from the lens surface is tightened with a nut to be fixed. If the lens is made of a material that is difficult to break, the hole formed in the lens may be used as it is as a connection hole, and an elastic packing material made of soft resin should be interposed between the lens surface and the nut. It is said that you may.

[0007] In the frameless glasses disclosed in this document, since the prism and the connection hole cannot rotate with each other, the holding member does not rotate with respect to the lens. In addition, since a hard-to-make and fragile backing plate is not used, durable frameless glasses can be obtained more easily. Further, since the requirement for machining accuracy for drilling holes in the lens is greatly eased, even a non-skilled retail shop owner can work satisfactorily. In addition, the design of the glasses is simple, and the surroundings of the lenses are neatly organized, and there is also an effect of improving the design feeling.

[0008]

However, the frameless glasses described in Japanese Patent Application Laid-Open No. Hei 7-234383 have a prism inserted closely into a connecting hole and fixed with screws or the like. When the temple is widened, for example, when the temple is removed, the force directly acts on the lens. At this time, the force applied to the lens is enlarged by leverage and becomes extremely large, so that the lens may be damaged and the spectacles may be broken.

Therefore, an object to be solved by the present invention is to eliminate the need for using a backing plate for supporting a lens holding member, such as a bridge, a yoke, and a lens stopper, which is used for forming frameless eyeglasses, in contact with the lens edge surface. Another object of the present invention is to provide frameless glasses having a lens holding structure that prevents the holding member from rotating with respect to the lens and prevents the lens from being damaged even when the glasses are detached.

[0010]

In order to solve the above-mentioned problems, in the frameless eyeglasses of the present invention, a through-hole is formed in an eyeglass lens, and a lens holding member such as a bridge or a temple is engaged with the through-hole to hold the lens. Frameless eyeglasses, wherein a lens holding structure comprising a through hole formed on the lens side at the holding position, an engagement shaft formed on the lens holding member side, and an elastic cushion material interposed therebetween. Have. Here, the through-hole and the engagement shaft have a cross-sectional shape that makes it difficult to rotate with each other by meshing with each other. By fixing the holding member to the lens by interposing an elastic cushioning material between such a through hole and the engagement shaft, the holding member such as a bridge or a temple and the lens are prevented from rotating relatively, and the cushion is It is characterized in that the stress applied to the lens when the glasses are detached or the like is relieved by the elastic force of the material.

The cross-sectional shape of the through hole may be rectangular or elliptical. The cross-sectional shape may be any shape such as polygon, star, or ellipse as long as the through-hole engages with the engagement shaft so that they do not rotate with each other. In addition, it is possible to make eyeglasses that are more aesthetically pleasing.

It is preferable that the direction of the through hole, that is, the direction of the engagement shaft is such that the major axis direction of the sectional shape is substantially horizontal. This is because the moving direction of the temple or the like is substantially horizontal, and it is preferable that the buffering force in this direction is large. Also, this is because it is convenient when the through hole and the engagement shaft are hidden by a flap or the like.

When rubber is selected as the elastic cushioning material, the product properties such as hardness and shape are free and production is easy, so that a cushion having an appropriate cushioning force according to the cross-sectional shape can be obtained.

[0014] A guide fitting can be inserted inside the cushion material. If a guide metal made of a thin metal plate or the like is inserted inside the cushion material in advance, friction between the engagement shaft and the cushion material is eliminated when the engagement shaft is inserted, so that the eyeglasses can be easily assembled.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the frameless eyeglasses according to the present invention will be described in detail using embodiments with reference to the drawings. 1 is an exploded view showing a part of a lens holding structure of the frameless eyeglasses of the present embodiment, FIG. 2 is a perspective view of the frameless eyeglasses to which the present invention is applied, and FIG. 3 shows another aspect of the present embodiment. It is an exploded view.

As shown in FIG. 2, the frameless eyeglasses of the present embodiment hold the middle of two lenses 1 by connecting them with a bridge 3 and fix temples each having an end 2 at each end. keeping. As shown in FIG. 1, the lens holding structure in the present embodiment
The main components are a through hole 15 formed in the hole, an engagement shaft 11 fixed to the yoke 2, and a cushion material 14. Further, a guide fitting 13 that is inserted inside the cushion member 14 and guides the engagement shaft 11 can be added.

The through hole 15 is formed near the edge of the lens 1 and has a rectangular cross section that is long in the horizontal direction. Engagement shaft 1
1 is fixed to the side of the yoke 2 which contacts the lens 1, and has a cross section substantially similar to the through hole 15. Cushion material 1
Reference numeral 4 denotes an elastic rubber, which is interposed between the through hole 15 and the engagement shaft 11 as a cushioning material. One end of the cushion material 14 has an ear. The guide fitting 13 is formed of an elastic metal plate, has a cylindrical shape with one portion on the periphery cut off, and has a shape that fits the outer periphery of the engagement shaft 11.

A male screw 12 having a diameter smaller than the diameter of the engaging shaft 11 is protrudingly provided on the yoke 2. To fix the temple to the lens 1, a nylon flat washer 16, a metal flat washer 17, and a hexagonal flat nut 18 and a hexagonal cap nut 19 which fit the male screw 12 are provided on the opposite side of the lens 2 with the lens 1 interposed therebetween. I do.

These are assembled in the order shown in the figure. First, the rubber cushion 14 is inserted into the through hole 15, and the guide fitting 13 is inserted therein. Since the guide fitting 13 has a cutout, the guide fitting 13 can be easily reduced in diameter and inserted into the cushion 14 irrespective of the friction of the cushion 14. Next, the engagement shaft 11 is inserted therein. The engagement shaft 11 is guided by the guide fitting 13 and easily stored at a predetermined position. Note that the shoulder of the tip portion of the engagement shaft 11 may be appropriately dropped to facilitate insertion into the guide fitting 13.

A hexagonal flat nut 18 is screwed into a screw 12 projecting from the rear side of the lens 1 with a nylon flat washer 16 and a metal flat washer 17 interposed therebetween.
And securely screw it in as a double nut. The ears of the cushioning material 14 are interposed between the lens 1 and the yoke 2, and the nylon washer 16 is interposed between the back surface of the lens 1 and the flat metal washer 17. It will not be scratched. The connection between the bridge 3 and the lens 1 may be made in the same manner with the same configuration.

The frameless eyeglasses of the present embodiment have a mechanism for holding the lens by engaging each one at one place.
Since the through hole provided on the lens side and the engagement shaft provided on the lens holding member do not rotate with each other, the shape of the glasses can be maintained. In addition, it is not necessary to use the edge holding metal fitting, so that the aesthetic appearance of the frame can be refreshed and the commercial value is improved. In addition, there is an advantage that the lens holding member can be easily manufactured and is not easily damaged.

Further, in contrast to the conventional technique in which the lens and the holding member are fixed by tightening them, in the present embodiment, the elastic material is interposed between the through-hole and the engaging shaft so as to be flexible. As a result, the lens holding member causes buffering and twisting forces which are inevitably generated due to the lens holding member when the eyeglasses are used, such as when the glasses are detached, and the lens is prevented from cracking. In addition, since there is play between the lens and the bracket, the feel of the temple hitting the ear is softened, and the feeling of wearing is improved. Conventional temples have used expensive metals and alloys in pursuit of light materials with moderate elasticity, but using the holding mechanism of the present invention eases the conditions and expands the range of material choices, allowing more freedom in design. Becomes possible.

The guide fitting 1 as in this embodiment
3 has the effect of facilitating the insertion of the engaging shaft 11 and the guide metal 13
However, it is needless to say that frameless glasses can be made without the guide fitting 13. Although the male screw 12 protrudes from the engaging shaft 11, a female screw may be cut into the engaging shaft 11 and screwed from behind the lens 1.

In this embodiment, the cross section of the through hole 15 and the engagement shaft 11 is described as being rectangular, but any shape may be used as long as the two are loosely fitted and do not rotate with each other. There may be. For example, triangles, hexagons, stars, ellipses, and various other irregular shapes can be used. The cushioning material 14 is formed according to the shape of the through hole. However, it is sufficient that an appropriate cushioning force can be applied between the lens and the engagement shaft. May be.

FIG. 3 is a view for explaining an example in which the through-hole 15 formed in the lens has an oval shape and an O-ring is used as a cushion material. Through hole 1 drilled in lens part
Numeral 5 is an ellipse formed by connecting the semicircles at both ends with tangent lines. The guide fitting 13 is also formed by bending a leaf spring material to have an oval shape smaller than the inner diameter of the through hole 15, and the diameter of the guide fitting 13 can be reduced somewhat by being separated from one place. The outer diameter of the engagement shaft 11 is substantially equal to the size of the outer ring. In the figure, reference numeral 21 denotes an O-ring, and 22 denotes a washer. The O-ring 21 is selected so that its outer peripheral length is slightly longer than the peripheral length of the through hole 15. Also,
The washer 22 is made of nylon, rubber, or the like, and serves as a buffer between the yoke 2 and the lens 1. The washer 22 fits in the hole.

An example of the procedure for assembling the frameless glasses is as follows. First, an O-ring 21 is inserted into the guide fitting 13 and inserted into the through hole 15, and then the engaging shaft 11 is passed through the washer 22 before the guide fitting 13 is mounted. Insert inside. Further, the lens holding member is fixed to the lens by biting a double nut into the male screw 12 appearing on the back side of the spectacle lens via a resin washer and a metal washer in the same manner as described above. When configuring frameless glasses in this way, you can use easily available O-rings instead of using specially shaped cushioning materials,
In addition, both ends of the through-hole may be drilled and finished, so that there is an advantage that the labor of processing can be omitted.

[0027]

As described in detail above, the frameless eyeglasses of the present invention can be designed freely without having to attach an extra contact plate to the edge of the lens, and the lens holding member such as a temple can be structurally constructed. It is sturdy and easy to assemble, and the force applied to the lens is reduced even when the temple is opened due to the removal of the glasses, so that damage to the lens can be prevented. In addition, since there is an appropriate play between the lens and the metal fitting, the feeling of touching the ear of the temple is softened, and the fit is improved.

[Brief description of the drawings]

FIG. 1 is an exploded view showing a part of a lens holding structure in one embodiment of frameless eyeglasses of the present invention.

FIG. 2 is a perspective view of frameless glasses to which the embodiment is applied.

FIG. 3 is an exploded view showing another embodiment of the present embodiment.

FIG. 4 is an exploded view showing an example of a lens holding structure in conventional frameless glasses.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Lens 2 Yoroi 3 Bridge 11 Engagement shaft 12 Male screw 13 Guide metal fitting 14 Cushion material 15 Through hole 16 Nylon flat washer 17 Metal flat washer 18 6 Square flat nut 19 Hexagonal cap nut 21 O ring 22 Washer

Claims (6)

[Claims] An edgeless eyeglass for holding a lens by engaging an engaging shaft provided on a lens holding member such as a bridge or a temple with a through hole provided in an eyeglass lens, wherein the through hole and the engaging shaft are provided. Have a cross-sectional shape that makes them difficult to rotate with each other, and the lens holding member is fixed to the lens by interposing an elastic cushion material between the through hole and the engagement shaft, thereby Edgeless glasses in which the holding member and the lens are prevented from rotating relative to each other, and the stress applied to the lens when the lens holding member is moved by the elastic force of the cushioning material is reduced. 2. The rimless glasses according to claim 1, wherein a cross section of the through hole is rectangular. 3. The frameless eyeglasses according to claim 1, wherein the cross section of the through hole is an oval. 4. The frameless glasses according to claim 1, wherein a major axis of a cross-sectional shape of the through-hole is oriented in a horizontal direction. 5. The frameless glasses according to claim 1, wherein the cushion material is made of rubber. 6. The frameless glasses according to claim 1, wherein a guide fitting is inserted inside the cushion material.