JPH0736122U - Lens stop mechanism for rimless glasses - Google Patents

Abstract

(57) [Abstract] [Purpose] The rimless eyeglass fixing mechanism according to the present invention uniformly applies the propulsive pressure of the nut on the rear surface of the lens, avoids the deformation of the lens surface and the screw due to uneven pressure unevenness, and further Its purpose is to ensure safety in the cut-off part of the screw. [Structure] An end surface of a nut on the lens side has an expanded portion that is hung with an inclined surface that converges downward, and the inner surface has a predetermined radius so as to slide into the inclined surface of the expanded portion.
A ring-shaped metal washer formed in a shape is placed on a resin washer, and a screw that presses the resin washer and the metal washer through the screw hole formed in the lens is screwed with the nut. Is. Further, the nut has a screw hole that penetrates to the uppermost part of the nut, and the head of the screw protruding from the screw hole is formed on the R surface.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a lens fixing mechanism for rimless spectacles, and more particularly to a lens fixing mechanism for rimless spectacles, which securely fixes a lens and a spectacle arm and has high safety even when worn.

[0002]

[Prior art and its problems]

 Conventional general spectacles consist of a rim frame front part that surrounds the left and right lens rims, and spectacle arms (temple and tip cell) that can be pivotally folded to the side edges of the left and right rim frames. Many of these spectacles have the same fashion as earrings worn on the ears in recent years.In particular, rimless spectacles emphasize not only the original function of spectacles but also the lighter weight and natural facial features. , The demand is increasing.

However, the rimless spectacles have a smaller number of parts than the spectacles with the frame because there are no frames, and therefore a stop mechanism for directly fixing the spectacle arm and the lens is required. For example, FIG. 3 illustrates a general stop mechanism for fixing either one of the left and right lenses and the spectacle arm.

In general, a prescription lens of spectacles has a lens surface formed so that its front surface and rear surface have different radii of curvature, and in most cases, the screw insertion hole is oriented in a direction orthogonal to the tangential direction C of the lens front surface. It has been opened. For this reason, the tangential direction A, in which the nut screwed into the screw is parallel to the surface facing the lens rear surface, is substantially parallel to C, while the line B parallel to the tangent line to the rear surface of the lens itself is Neither is parallel. Only three lines are parallel for a non-powered lens. For this reason, if the lens lock nut is tightened on a prescription lens, excessive force is applied to both sides of the lens and the screw, and there is a risk of damage.

FIG. 4 is a more detailed description of the fixing state of the conventional rimless spectacles by the lens stopping mechanism as described above.

The conventional rimless spectacles have a bridge connecting the left and right lenses 41, and a metal fitting for attaching a temple that extends from one end of each lens and is worn on the ear. In order to fix these bridges and metal fittings to the lens, a screw hole 42 that penetrates near one end of each lens, a lens fixing screw 43 that is inserted into this hole 42, and a lock nut (for example, a hexagon nut) 44 and a resin washer 45 that is elastically pressed into the gap between the rear surface of the lens 41 and the nut 44.

In this case, as shown in FIG. 4, in the normal prescription lens 41, the rear surface of the lens and the insertion direction of the lens fixing screw 43 are made orthogonal to each other by the curvature surface on the rear surface of the lens as described in FIG. The lens compression surface of the screw nut 44 is no longer parallel to the lens rear surface. Therefore, the rear surface of the lens and one end of the resin washer 45 are in contact with each other at the contact point A. On the other hand, point B, which is the other side of the resin washer 45, has a gap with the rear surface of the lens. When the screw nut 44 is tightened in this state, pressure is applied to the contact A, but at the point B on the opposite side, the distance between the rear surface of the lens and the resin washer is originally large, so pressure is applied to the lens surface. If this is not done and the nut is tightened as it is, pressure will be applied to the contact A and the screw, and there is a risk of damage to both the lens and the screw. In addition, when the nut is tightened, an unnecessary part of the screw remains on the upper part of the nut (the side facing the eyes and face), and when this is cut off, the protruding part (burr) is likely to remain, which poses a danger to the eyes and face. is there.

In order to avoid such a risk of burr, as shown in FIG. 5, a lens stopper bag nut is used to cover the tip portion of the screw, which is a necessary portion of the screw by tightening the nut, and the lens is attached. The description of the case of fixing is described below. The cap nut 51 is a nut having the shape shown in FIG. 4, and is intended to improve safety by covering the protruding portion after cutting off unnecessary portions of the screw.

Even when the cap nut 51 is used, a strong pressure is applied to the contact point A, which pulls the screw and causes a bending force, as in the case of FIG. .

In addition, when using such a cap nut, the screw is cut off to an optimum length in advance and then the nut is mounted, but a length must be left so that the screw thread of both the screw and the nut are sufficiently engaged with each other. I have to. If the cut-off is too long, the nut pressure cannot be applied to the rear surface of the lens, and if it is too short, the distance between the thread inside the nut and the screw body will be shortened, and the nut will fall out easily.

Lens lock nuts for rimless spectacles are roughly divided into the above two types, but in both cases, uneven pressure on the rear surface of the lens and a solution for safety at the cut-off portion of the face-facing lens There is a problem in.

[0012]

[Means and Actions for Solving the Problems]

 The present invention has been made in view of the above, and in order to securely fix the lens by the locking mechanism of the rimless glasses and to further secure the safety in view of the characteristics of the glasses to be worn on the face, the lens of the nut is used. The side end face has an expanded portion that hangs down with an inclined surface that converges downward, and the inner surface has a ring shape that is formed into a predetermined R shape so as to slide into the inclined surface of the expanded portion. A metal washer is placed on the resin washer, and a screw for pressing the resin washer and the metal washer through the screw hole formed in the lens is screwed with the nut. Further, the nut has a screw hole penetrating to the uppermost part of the nut, and the head of the screw protruding from the screw hole is formed on the R surface. By such means, the rimless eyeglass fixing mechanism according to the present invention can apply the driving force of the nut on the rear surface of the lens uniformly, and can avoid the conventional deformation of the lens surface and the screw due to uneven pressure distribution. In addition, it is possible to ensure safety at the cut-off portion of the screw on the face.

[0013]

【Example】

 Hereinafter, an embodiment of the present invention will be described in detail.

The rimless spectacle lens stopping mechanism according to the present invention will be apparent from the following description, but the description overlapping with the above-mentioned drawings will be omitted.

Rimless spectacles connect both lenses to the left and right lenses that are processed into a predetermined spherical surface according to the front and back focal powers by omitting the metallic rim frame that surrounds the periphery of commonly used lenses. It consists of a bridge member and a temple that extends from one end of the lens or an aspherical surface and is applied to the ear. The feature of the present invention is in how to attach both the bridge bracket and the temple.

FIG. 1 shows an embodiment of the present invention, for example, showing a fixed state of the portion of the metal fitting, which is curved to have a predetermined curvature in accordance with the focus power of a person who uses spectacles. Lens 11 and a screw hole 12 penetrating near one end of each lens for fixing the lens and metal fitting with a metal fitting (not shown) sandwiched in the direction opposite to the face (downward in the figure). A lens fixing screw 13 to be inserted into the hole 12, a screw fixing nut (for example, a hexagon nut) 14, and a resin washer 15 elastically pressed into a gap between the rear surface of the lens 11 and the nut 14 are provided. There is. This structure is similar to that of the conventional screwing mechanism shown in FIGS. 4 and 5, but the present invention has a unique structure in the following points, and the structure solves the above-mentioned problems. .

That is, according to the present invention, by disposing the nut 14 having a new shape different from the conventional nut and the metal washer 16 that slidably contacts the nut, the rimless that is more securely fixed and has high safety. It is to provide eyeglasses.

As shown in FIG. 1, the end surface of the nut 14 on the lens side has an expanded portion 17 that is expanded with an inclined surface that converges downward. On the other hand, a ring-shaped metal washer 16 whose inner surface is processed into a predetermined R shape 18 is placed on the resin washer 15 so as to slide into the R surface of the expanded portion 17. Therefore, the rounded surface 18 of the nut lower portion 14 comes into contact with the R surface 18 of the metal washer 16 over the entire circumference including the contacts A and B, and the pressure due to the nut tightening is evenly distributed to the resin washer and the lens rear surface. Tell. This avoids uneven pressure bias on the lens neck caused by conventional nuts.

Further, the nut 14 according to the present invention has a screw hole 19 cut to the uppermost part of the nut and has an opening 20. The screw 13 is cut off after it has been pulled over the nut 14. Therefore, with conventional cap nuts, the depth of the screw holes drilled in the inner surface of the cap nut and the adjustment of cutting off the lens fixing screw length that matches the hole depth of this screw to an appropriate screw length are possible. It was complicated, but with the nut 14 according to the present invention, it is only necessary to cut off the unnecessary protruding portion 21 of the screw after mounting the nut, the screw can be easily adjusted to the optimum length, and the screw on both the screw body and inside the nut can be easily adjusted. Since the distance between the mountains is long, it is difficult for the nut to fall out.

However, just by cutting off, as in the conventional case, the thread cut-off end has a sharp protrusion, so that the tool (file) 22 as shown in FIG. By rolling, a safe surface similar to a cap nut can be obtained.

[0021]

[Effect of device]

 As described above, according to the present invention, the end surface of the nut on the lens side has the expanded portion expanded with the inclined surface that converges downward, and the R surface of the expanded portion is opposed. A ring-shaped metal washer whose inner surface is machined into a predetermined R shape so as to slip in smoothly is placed on the resin washer. Therefore, the R surface of the lower part of the nut contacts the R surface of the metal washer over the entire circumference to uniformly transmit the pressure due to the nut tightening to the resin washer and the rear surface of the lens. Therefore, it is possible to avoid uneven pressure unevenness on the lens and screw caused by the conventional nut. Furthermore, the nut according to the present invention has a threaded hole up to the top of the nut and is penetrated so as to have an opening. Therefore, the screw is cut off after it has been removed to the top of the nut, and unnecessary protrusions of the screw are cut off after mounting the nut, so that the screw can be easily adjusted to the optimum length, and the screw on both the screw body and inside the nut can be easily adjusted. Since the distance between the mountains is long, it is difficult for the nut to fall out.

As described above, since the unnecessary protruding portion can be easily leveled and rolled, safety can be ensured.

[Brief description of drawings]

FIG. 1 is an explanatory view showing a lens stop mechanism and a mounted state according to the present invention.

FIG. 2 is an explanatory view showing a tool for leveling a screw protrusion according to the present invention and its application state.

FIG. 3 is an explanatory view showing a screw insertion direction of general eyeglasses and directions of respective control surfaces.

FIG. 4 is an explanatory diagram showing a lens fixing state when a conventional nut is used.

FIG. 5 is an explanatory diagram showing a fixed state of a lens when a conventional cap nut is used.

[Explanation of symbols]

 11 Lens 12 Screw Hole 13 Lens Fixing Screw 14 Nut 15 Resin Washer 16 Metal Washer 17 Expanded Part 18 R Surface 19 Screw Hole 20 Opening 21 Projection 22 Tool

Claims (2)

[Scope of utility model registration request] 1. A lens-side end surface of a nut has an expanded portion that is hung with an inclined surface that converges downward, and the inner surface has a predetermined radius R so that it can slide into the inclined surface of the expanded portion. A ring-shaped metal washer that is formed in a shape is placed on the resin washer, and a screw that presses the resin washer and the metal washer through the screw hole formed in the lens is screwed with the nut. A lens stop mechanism for rimless eyeglasses. 2. The lens fixing mechanism for rimless spectacles according to claim 1, wherein the nut has a screw hole penetrating to the uppermost part of the nut, and the head of the screw protruding from the screw hole is formed on the R surface.