JP2016180923A - Rim for spectacle frame - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rim that constitutes the front part of a spectacle frame and can restrain chipping and cracking of the lens circumference.SOLUTION: A rim in which an inner circumferential concave groove 2 into which a convex 6 disposed on the outer circumference of a lens is fitted therein is formed continuously and a groove 3 is also formed continuously can ease concentration of partial stresses on the lens outer circumference fitted into the concave groove 2.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a rim of a spectacle frame that can alleviate the action of excessive stress when a lens is fitted.

  FIG. 5 shows a conventional general metal eyeglass frame (eyeglass frame). As shown in the figure, the spectacle frame is composed of a front part (A) and vines (B) attached to both sides of the front part (A). The front part (A) has a rim (ha ), (C) are connected symmetrically by the connecting member (d), and the outer parts (e), (e) provided on the outside of the front part (a) are connected with hinges (f), (f) The cranes (B) and (B) are connected so that they can be folded. The nose pads (g) and (g) are attached to the center of the front part (A) and below the connecting member (d).

A lens is fitted to the rims (c) and (c). At this time, a rim lock is provided on the outer side of the rims (c) and (c) on the back side of the armatures (c) and (c). By loosening the screw of the rim lock, the circumference of the rims (c) and (c) is enlarged. In this state, the lens is fitted and the rim lock screw is tightened again.
FIG. 6 shows an enlarged cross-sectional view (a cross-sectional enlarged view of AA in FIG. 5) in a state in which the lens is fitted to the rim (c). A concave groove (h) is formed on the inner periphery of the rim (c). The convex portions (nu) formed along the outer periphery of the lens (li) are fitted in the concave grooves (chi).

  By the way, the rim (C) is bent into a ring shape by bending a wire having a predetermined cross section, and the lens (R) is cut to fit into the rim (C). If the outer shape of the lens is circular, bending of the rim is relatively easy and the dimensional error is small. However, since the lens is approximately elliptical, the outer shape is not the same plane but curved in a three-dimensional shape. . Therefore, the shape of the rim (c) must also be formed as a three-dimensionally curved ring body, and the dimensional error of the shape is generated as a local stress when the lens (re) is fitted. For this reason, the outer periphery of the lens is chipped or sometimes the lens is cracked.

“Glasses rim configuration” according to Japanese Patent Application Laid-Open No. 2015-14673 is a rim to which a lens of a spectacle is fitted, and in order to prevent the lens from cracking or chipping, a partial stress is not applied to the outer periphery of the lens. It is the form of a rim.
In other words, a notch is formed on the surface of the rim to reduce the bending rigidity of the rim and suppress excessive stress acting on the lens. Further, a plurality of small notches are formed on the front side and the back side over the entire circumference of the rim, and the positions of the front side notch and the back side notch are shifted.

The “rim structure of spectacles” according to Japanese Patent Laid-Open No. 2001-330802 is a rim for fitting spectacle lenses, and the lens fitted on the rim is subjected to partial high stress without providing a rim lock as in the prior art. The rim structure does not cause lens breakage.
That is, the rim includes a rim main body and an auxiliary rim, and the lens can be mounted by sandwiching the outer periphery of the lens between the rim main body and the auxiliary rim.
“Rim form of glasses” according to Japanese Patent Application Laid-Open No. 2015-14673 “Glass rim structure” according to Japanese Patent Laid-Open No. 2001-330802

  As described above, when the lens is fitted to the ring-shaped rim, a local stress acts on the lens due to an error in the shape and size of both. In order to solve this problem, various techniques are conventionally known. The problem to be solved by the present invention is also this problem, and provides a rim of a spectacle frame that can suppress lens breakage by a method different from the conventional means.

The rim of the eyeglass frame according to the present invention has a shape in which the rim side can be slightly deformed by fitting a lens. That is, it has a cross-sectional shape in which a concave groove is provided on the inner peripheral side so that a convex portion on the outer periphery of the lens fits in the same manner as a conventional rim, and an outer peripheral groove is provided on the outer peripheral side.
Accordingly, the cross section of the rim is formed such that grooves are formed on both the inner peripheral side and the outer peripheral side, and the rigidity about the neutral axis of the rim is reduced.

Here, the cross-sectional shape of the concave groove into which the convex portion of the lens fits is generally a V-shaped cross section having inclined surfaces on both sides, and the cross-sectional shape of the groove formed on the outer peripheral side is not particularly limited, It is configured as a groove having a constant cross section that is continuous in the direction.
A groove bottom provided on the outer periphery is a flat surface, a pattern may be formed on the flat groove bottom, and a colorful resin may be poured to provide a resin layer.

  In the rim according to the present invention, a concave groove is provided along an inner peripheral surface thereof, and a convex portion on the outer periphery of the lens can be fitted into the concave groove. Grooves are also provided along the outer periphery of the rim. For this reason, the rim cross section has a shape in which the central portion is depressed on the inner peripheral side and the outer peripheral side, and the bending rigidity about the neutral axis is small. Therefore, even if there are some errors in the shape of the rim and the outer periphery of the lens, the rim is deformed to fit into the outer periphery of the lens, and the generation of locally unreasonable stress can be alleviated. Therefore, there is an effect of suppressing chipping and cracking on the outer periphery of the lens.

On the other hand, the groove provided along the outer periphery of the rim brings about a design effect at the front portion of the spectacle frame, resulting in an unprecedented design. In particular, a pattern can be formed on the bottom of the outer peripheral groove, and a resin layer can be provided by pouring a colorful resin in the groove, thereby forming a spectacle frame having a colorful appearance at the front portion.
By providing a groove on the outer periphery of the rim, the rim becomes lighter. When wearing glasses, the surface pressure acting on the nose pad is lowered to support the front portion, and fatigue is reduced even when worn for a long time.

The Example which shows the rim wire which comprises the rim | limb concerning this invention. Enlarged view of the rim line. The lens outer peripheral part cross-sectional enlarged view. The example of the pattern formed in the rim outer periphery groove | channel. General metal eyeglass frame. The cross-sectional enlarged view in which the lens is fitted in the concave groove on the inner periphery of the rim.

  The rim according to the present invention is a member to which a lens can be fitted in the same manner as the front part of a conventional general spectacle frame, and the rim has various shapes and is circular or substantially elliptical. Or can be configured as a generally square with rounded corners. Further, there is a case in which a high rim yarn such as a water yarn is combined to form a half rim type that holds the lens.

  FIG. 1 shows a rim wire 1 used when a ring-shaped rim is formed to fit a lens, and the rim wire 1 is a thin wire having a constant cross section. The rim wire 1 constituting the rim of the present invention has an inner circumferential groove 2 on the lower side and an outer circumferential groove 3 on the upper side. The outer periphery of the lens is fitted. The upper outer peripheral groove 3 is formed along the outer periphery when it forms a rim.

The rim wire 1 is bent into a ring shape so that a lens can be fitted therein. The rim wire 1 having the inner circumferential groove 2 and the outer circumferential groove 3 is drawn by a mold. The rim wire 1 drawn into a predetermined cross section is wound around a mold and formed into a ring-shaped rim, but the rim is not formed on the same plane but has a three-dimensionally curved shape. .
That is, the outer periphery of the lens is not the same plane, and if the lens is placed on the table surface, the entire outer periphery does not contact the table surface, and there are portions where there are gaps between the table surface.

The lens is cut into an oval or other non-circular shape using a circular bead that is curved with a constant curvature. Therefore, the outer shape is curved into a three-dimensional shape without being in the same plane. Of course, in the case of a circular lens, the outer periphery is on the same surface, and the entire periphery is in contact with the table without any gaps.
Therefore, the rim is bent and molded into the same shape as the outer periphery of the lens curved in a three-dimensional shape. For this purpose, the rim wire 1 is wound around a predetermined mold, and the mold is manufactured in consideration of springback (elastic recovery) when it is removed from the mold.

  As described above, even if the rim is formed in consideration of the spring back, it is impossible to manufacture a rim that completely matches the outer periphery of the lens. That is, a slight error occurs between the lens outer periphery and the rim. For this reason, when the lens outer periphery fits into the inner peripheral concave groove 2 of the rim, a high contact stress is partially generated on the lens outer periphery.

  The lens in recent years is not a glass lens as in the past, but a plastic lens is the mainstream, and some deformation is allowed, but the outer periphery of the lens is affected by partial high stress generated by fitting to the rim. Chipping or lens cracking occurs. However, as shown in FIG. 1, the rim of the present invention uses a rim wire 1 in which a groove 3 is formed on the outer periphery.

  The outer circumferential groove 3 is continuous over the entire circumference of the rim, so that the moment of inertia of the cross section of the rim line is reduced, and the rim side is caused by partial concentrated stress based on a dimensional error generated between the rim and the outer circumference of the lens. Bring about the deformation. That is, the concentration of stress on the outer periphery of the lens is reduced so as not to deform only the outer periphery of the lens.

FIG. 2 shows an enlarged view of the rim line 1. The inner circumferential groove 2 provided on the inner circumferential side has inner circumferential surfaces 4 and 4 inclined in an inverted V shape, and the intersection angle θ between both inner circumferential surfaces 4 and 4 is bent to form a rim. The crossing angle θ changes.
FIG. 3 is an enlarged view showing a cross section of the outer peripheral portion of the lens 5, and a convex portion 6 is formed on the outer peripheral portion of the lens. Since the lens is cut into a predetermined shape, its dimensional error is extremely small.

On the other hand, when the rim wire 1 shown in FIG. 1 is bent into a ring shape, it is not easy to match the outer periphery of the lens. The material of the rim wire 1 is not uniform, and a part of the bent rim is returned and deformed by the spring back.
Further, the crossing angle θ of the inner peripheral surfaces 4 and 4 also changes at the time of bending the rim. For this reason, the lens 5 is partially fitted between the inner peripheral surfaces 4 and 4 and the lens convex portion 6 by being fitted to the rim. High surface pressure is generated.

In the rim of the present invention in which the outer peripheral groove 3 is formed, if the bending rigidity with respect to the neutral surface is lowered and the convex portion 6 of the lens 5 is fitted and a high surface pressure acts on the inner peripheral surfaces 4, 4, The cross section of the rim is deformed so that the crossing angle θ can be enlarged.
Therefore, the outer circumferential groove 3 is shaped so that the edges 7 are left on both sides of the outer circumference of the rim so that the thickness of the rim cross section at the top 8 of the inner circumferential concave groove 2 is reduced.

On the other hand, patterns 10, 10,... Are formed on the groove bottom 9 of the outer circumferential groove 3. FIG. 4 shows a plan view of the rim line 1, and a certain pattern 10, 10,... Is repeatedly formed continuously. In the present invention, the specific pattern form formed on the groove bottom 9 is not limited, and the means for forming the patterns 10, 10,.
In addition, a colorful resin can be poured into the outer peripheral groove 3 to form a resin layer, thereby forming a spectacle frame having a front portion with a design that does not exist in the past.

DESCRIPTION OF SYMBOLS 1 Rim wire 2 Inner peripheral groove 3 Outer peripheral groove 4 Inner peripheral surface 5 Lens 6 Convex part 7 Edge 8 Top part 9 Groove bottom
10 patterns

Claims (3)

In the rim constituting the front portion of the spectacle frame, the rim is formed continuously with an inner circumferential groove that fits a convex portion provided on the outer periphery of the lens, and a groove is also continuously formed on the outer circumference, and is fitted into the groove. An eyeglass frame rim characterized by relieving partial stress concentration on the outer periphery of the lens. The spectacle frame rim according to claim 1, wherein a pattern is formed on the bottom of the outer peripheral groove. The eyeglass frame rim according to claim 1, wherein a resin layer is formed by pouring resin into the outer circumferential groove.

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