JPH02201418A - Hinge for spectacles - Google Patents

Abstract

PURPOSE:To maintain opening/closing actions stable over a long period of time without wear and to improve the durability of even the hinges made of titanium and titanium alloy which have problems with the durability of the hinges by using fine ceramics as the washer of the hinge. CONSTITUTION:The washer made of the fine ceramics formed by using a high- purity nonmetallic inorg. material as a raw material is used as the washer 1 to be used for the hinge. The fine ceramics washer 1 has 9 Mohs' hardness and the hardness highest next to the hardness of diamond. This washer has extremely high wear resistance and hardly wears when used for the hinge of ordinary spectacles. The washer is hardly attacked by acids and alkalis and is chemically stable; in addition, the electrochemical corrosion by the contact with other metals does not arise. The compatibility with the titanium and titanium alloy is particularly good and clatters are not generated even after the long-term use. The use of this washer even with the hinges consisting of hard materials, such as titanium and titanium alloy, is possible in this way. The hinge provided with the washer having the high mechanical strength and durability is obtd.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to the structure of a hinge for eyeglasses, and in particular is characterized by the material of the washer.

[Prior Art] Conventionally, washers made of a material softer than the material constituting the hinge have been used in the hinges of eyeglasses in order to smoothly open and close the glasses.

[Problem to be solved] Conventional washers like this are relatively soft,
Particularly when the hinge is made of a hard material, the wear is severe and the hinge may gradually become rattled during use. In addition, especially titanium and titanium alloys are hard materials and have rough microstructures, so they wear out rapidly. Therefore, with hinges made of titanium or titanium alloys, it is necessary to prevent the washer material from wearing out.

Furthermore, if the washer and hinge are made of different materials, electrochemical corrosion may occur due to adhesion of moisture such as sweat and contact between dissimilar metals. Resin washers do not need to be concerned about this electrochemical corrosion, but they lack mechanical strength and have durability problems.

The present invention has been made in view of the problems of the conventional technology, and its purpose is to enable use with hinges made of hard materials such as titanium and titanium alloys, and to provide electrochemical It is an object of the present invention to provide a hinge equipped with a washer that is free from corrosion and has high mechanical strength and durability.

[Means for Solving the Problems] In order to achieve the above object, a fine ceramic washer made from a high purity non-metallic inorganic material was used as a washer for the hinge of the present invention.

[Works] Cofine ceramic washers have a Mohs hardness of 9, second only to diamond in hardness, and are extremely wear resistant.
When used on regular eyeglass hinges, there is almost no wear.

In addition, it is chemically stable against acids and alkalis, and does not cause electrochemical corrosion due to contact with other metals. It has particularly good compatibility with titanium and titanium alloys, and does not wobble even after long-term use.

[Embodiment] An embodiment will be described with reference to the drawings. FIG. 1 is a top view of a hinge of an eyeglass according to an embodiment of the present invention. The hinge is the second
As shown in the figure, it is divided into two parts, and a washer 1 is fitted to the contact portion.

Figure 3 is a cross-sectional view of the hinge, with washers 2 and 3 arranged,
Rotate. The washer has a shape as shown in FIG. 4 and is made of fine ceramic material. Fine ceramic materials can be used to create parts with precise shapes and smooth surfaces.

FIGS. 5 and 6 show other embodiments of the invention using washers of other shapes. As for the shape of the washer, other suitable shapes can also be adopted.

[Effects of the Invention] Since the hinge of the present invention uses fine ceramic for the washer, stable opening and closing operations can be maintained over a long period of time without wear. Furthermore, the durability of hinges made of titanium and titanium alloys, which previously had problems due to the hardness of the material, can be expected to be significantly improved in durability.

[Brief explanation of the drawing]

Fig. 1 is a top view of a hinge according to an embodiment of the present invention, Fig. 2 is an exploded explanatory view of the hinge, Fig. 3 is a sectional view of the hinge, Fig. 4 is a perspective view of a washer made of fine ceramic, and Fig. 5 6 is a cross-sectional view of the hinge, and FIG. 6 is a perspective view of a fine ceramic washer. 1.2, 3, 4, 5, 6, 7... Fine ceramic washer Fig. 2 Fig. 3

Claims (2)

[Claims] (1) A hinge for glasses that uses a washer made of fine ceramic. (2) The hinge for eyeglasses according to claim 1, wherein the material of the hinge is titanium or a titanium alloy.