JP2019132883A - Metal hinge and spectacle frame including the same - Google Patents

Abstract

To provide a metal hinge capable of making all constituted components from titanium, having a struggle maintained over a long term and having excellent corrosion resistance and physiological suitability, and a spectacle frame using the same.SOLUTION: The metal hinge including a pair of coupling members consisting of a titanium based material rotatably and pivotally supports the coupling members to each other. Slide facing surfaces sliding to each other when rotating the coupling members are formed of the titanium based material, and a slide contact layer 3a including a graphitic material is formed on at least one surface.SELECTED DRAWING: Figure 2

Description

The present invention relates to a metal hinge and a spectacle frame provided with the same, and more particularly to improvement of the opening characteristic (sliding characteristic) and seizure resistance of the hinge.

The glasses are equipped with hinges for opening and closing the temples. Hinges used to be independent parts in many cases, but now, for the purpose of improving the design, the hinge mechanism is applied to temples and fronts to integrate them with them. Yes.

As for the hinge, when the temple is opened and closed, the constituent parts slide. A typical hinge includes a top, a top, and a washer. In this case, the opposing surfaces of the top and the washer slide. Here, “unlike smoothness in the lubrication state, the hinge has a certain amount of frictional force when the temple is opened and closed, and on the other hand, the slidability is not too stiff” as “Agaki” (JISB7283: 1997 This method is called a repeated durability test method (discontinued on September 20, 2008), and there is a need in the market for a hinge that maintains its finish over a long period of use. Further, the hinge performance is also required to have excellent corrosion resistance and physiological compatibility in a general human use environment.

Furthermore, in the market, there is always a need for a titanium spectacle frame made of titanium, which is a material having excellent corrosion resistance and physiological compatibility. When it is moved, the surface oxide film is worn and the active surface is exposed and seizure occurs, so that the hinge does not fulfill its function.

Therefore, in the past, titanium eyeglass frames have been dealt with by interposing a material such as white or polyacetal on the sliding counterpart opposite to titanium in order to prevent seizure of the hinge and to keep the punching.

Similarly, Patent Documents 1 to 3 have been proposed for the purpose of maintaining the postcard. Patent Document 1 proposes a washer made of phosphor bronze. Patent Document 2 proposes a washer formed by compressing and baking polyimide resin powder. Patent Document 3 proposes a conductive washer formed by molding a fluororesin material having conductivity.

As described above, even in the product described as a titanium eyeglass frame, in order to prevent the seizure of the hinge, the actual condition is that a material other than the above-mentioned titanium is actually used for a part such as a washer. .

JP 2005-17363 A JP-A-6-59219 Japanese Utility Model Publication No. 7-34429

As mentioned above, regarding hinges for titanium eyeglass frames, the market requires that all the components are made of titanium, that the finish is maintained over a long period of time, and that it has excellent corrosion resistance and physiological compatibility. It has been.

If the sliding counterpart facing titanium is made of white or polyacetal, these materials are softer and less active than titanium, so there is almost no wear on titanium and almost no seizure occurs. Is maintained. However, on the contrary, since these materials are greatly worn, the long-term firing is not maintained. Furthermore, since the whites contain copper and nickel, the corrosion resistance and the physiological compatibility are inferior to titanium.

Moreover, since the material shown by patent document 1 is phosphor bronze and contains copper, the said corrosion resistance will be inferior. Moreover, since the material shown in Patent Document 2 is a polyimide resin, it is considered to be excellent in the corrosion resistance and the physiological compatibility, but because it is softer than titanium, for the same reason as described above. Long-term struggle will not be maintained. The material disclosed in Patent Document 3 is a fluororesin, so it is considered to be excellent in the corrosion resistance. However, since it is softer than titanium, the long-term finish is maintained for the same reason as described above. It will not be done.

As described above, the present situation is that there is no effective way to deal with the above-described requirement for the hinge of the titanium eyeglass frame.

In view of the above, the present invention is a metal hinge having excellent corrosion resistance and physiological compatibility, in which all components can be made of titanium, and the finish is maintained over a long period of time. An object is to provide a spectacle frame using the.

In order to achieve the above object, the present invention has the following features.
(1) A metal hinge having a pair of connecting members made of a titanium-based material and pivotally supporting the connecting members so that they can rotate with respect to each other, and sliding surfaces facing each other when the connecting members are rotated. Is a metal hinge formed of a titanium-based material and having a sliding contact layer having a graphite-like substance on at least one surface.

(2) A first frame portion is formed on one side of the connecting member and a pair of second frame portions are formed on the other side, and the sliding facing surface has the first frame portion as the first frame portion. The metal hinge as set forth in (1), which is a surface which is fitted between the two frame portions and comes into contact with each other.

(3) The sliding layer is a graphite having two peaks between wave numbers 1200 cm −1 and 1800 cm −1 in a Raman spectrum obtained by Raman spectroscopic analysis using an argon laser having a wavelength of 514.5 nm as an excitation source. Metal hinges as described in (1) or (2) which have a state substance.

(4) The metal according to any one of (1) to (3), wherein the sliding contact layer has a graphite-like substance generated by carburizing a titanium material on at least one surface of the sliding facing surface. A hinge.

(5) The sliding contact layer has a graphite-like substance generated by coating at least one surface of the sliding facing surface with titanium carbide or titanium carbonitride and sliding the surface with another surface. The metal hinge according to any one of (1) to (3).

(6) The sliding contact layer has a graphite-like substance in which a material mainly composed of carbon is physically attached to at least one surface of the sliding facing surface. The metal hinge described.

(7) An eyeglass frame provided with the metal hinge according to any one of (1) to (6).

According to the present invention, since the sliding contact layer having the graphite-like substance is formed on at least one surface of the sliding facing surface, even if all the components are made of titanium, it is baked for a long time (good sliding characteristics) ) Are maintained and have excellent corrosion resistance and physiological compatibility.

It is a disassembled perspective view regarding the hinge for eyeglass frames. It is a partially expanded sectional view regarding a hinge. It is a schematic diagram for demonstrating the method of the hinge front test of Example 1 and 2 of this invention. It is a front test result figure obtained by Example 1 of this invention. It is a front test result figure obtained by Example 2 of this invention.

Hereinafter, embodiments of the present invention will be described with reference to FIGS. 1 and 2.

FIG. 1 is an exploded perspective view of a hinge for a spectacle frame, and FIG. 2 is a partially enlarged sectional view of the hinge. The hinge 5 includes a one-piece top 1 and two-piece top 2 that are connecting members, and the one-piece top 1 is fitted with washers 3 on both sides of the first top portion 1a to form a pair of two-top pieces 2. The first piece 1 and the two pieces 2 are rotatably connected to each other by a set screw 4.

In this example, the single top 1, the top 2 and the washer 3 are made of a titanium-based material. Here, examples of the titanium-based material include titanium metal and titanium alloy.

The abutting surfaces of the washer 3 and the second piece portions 2a and 2b facing each other are slidable facing surfaces, and the sliding facing surfaces slide when the single top 1 and the double top 2 rotate relative to each other. Get in touch. As shown in FIG. 2, a sliding contact layer 3 a having a graphite-like substance is formed on the sliding facing surface of the washer 3.

Here, the graphite-like substance is a substance having two peaks between wave numbers 1200 cm −1 to 1800 cm −1 in a Raman spectrum obtained by Raman spectroscopic analysis using an argon laser having a wavelength of 514.5 nm as an excitation source. It is. One of the two peaks has a peak position between wave numbers 1200 cm-1 and 1500 cm-1, and the other has a wave position between wave numbers 1500 cm-1 and 1800 cm-1. Graphite-like that shows a Raman spectrum in which a peak existing between wave numbers 1200 cm −1 to 1500 cm −1 is peak-fit with a Gaussian function and the half-width of the peak-fitted Gaussian function is larger than that of pure graphite (23 cm −1). Since the material has better sliding characteristics than pure graphite, the wear of the sliding facing surface is less likely to progress beyond a predetermined amount, and it has excellent sliding characteristics, so that the agitation is maintained over a long period of time. Will be a hinge.

The sliding contact layer can be formed into a layer by generating a graphitic substance by carburizing the surface of the sliding facing surface. When the carburizing treatment is performed by a general method, no graphite-like substance is generated on the surface. However, when this is performed under an excessive carburizing condition, the graphite-like substance is reliably generated on the surface. Moreover, since the amount of the graphite-like substance changes depending on the degree of overcarburization, conditions may be set as appropriate.

Further, the sliding contact layer covers the surface of the sliding facing surface with titanium carbide or titanium carbonitride, and further slides the surface of titanium carbide or titanium carbonitride against another surface to slide the graphite-like substance. It can also be formed into a layer. Titanium carbide or titanium carbonitride does not produce a graphitic substance on the surface as it is coated. Moreover, since titanium carbide and titanium carbonitride are hard, if they slide while covered, there is a possibility that the sliding surface will be damaged and worn greatly. However, when the surface is slid with another surface after being coated with titanium carbide or titanium carbonitride, a graphite-like substance is generated on the sliding facing surface due to frictional heat. Since the amount of the graphite-like substance generated varies depending on the sliding surface pressure and sliding time, necessary conditions may be set as appropriate.

The sliding contact layer can be formed by physical means such as rubbing a material mainly composed of graphite on the sliding facing surface. This method is preferable without requiring a special apparatus, but other methods such as vapor deposition may be used as long as a graphite-like substance can be formed.

In this example, the sliding contact layer 3a is formed on the sliding facing surface that contacts the second piece portions 2a and 2b of the washer 3. However, the sliding contact layer 3a is also formed on the sliding facing surface of the second piece portions 2a and 2b. A contact layer may be formed, or a sliding contact layer may be formed only on the sliding facing surface of the second frame portion. Further, the first frame portion 1a and the second frame portions 2a and 2b can be configured to directly contact each other without attaching the washer 3, and in this case, at least one of the surfaces on which both the frame portions contact each other is possible. A sliding contact layer having a graphite-like substance may be formed on the sliding facing surface.

Further, the sliding facing surface may be a different combination such that one is carburized and the other is titanium carbide coating, and a sliding contact layer having a graphitic substance is formed on at least one surface of the sliding facing surface. That's fine.

The hinge 5 for the spectacle frame is required to maintain the finish over a long period of use. FIG. 3 shows a method of a front test of hinge 5 which is an embodiment of the present invention. First, the finish test piece 6 will be described. The final test piece 6 is manufactured by brazing the open / close titanium plate 7 and the fixing titanium plate 8 to the bottom surfaces of the single top 1 and the double top 2 of the hinge 5, respectively. In an actual eyeglass product, when the hinge 5 is opened so that the angle formed by the opening / closing titanium plate 7 and the fixing titanium plate 8 is 180 °, the opening / closing titanium plate 7 and the fixing titanium plate 8 come into contact with each other. It is often brazed, and this is a cause of loosening of the set screw 4. If the set screw 4 is loosened, the finish will not be maintained. In this embodiment, since only the effect of the sliding facing surface is desired to be measured, brazing is performed so that the opening / closing titanium plate 7 and the fixing titanium plate 8 do not contact each other as shown in FIG. Further, in order to completely suppress the loosening of the set screw 4, the set screw 4 of the hinge 5 is tightened with an arbitrary torque, and then fixed with a cis lock nut (manufactured by Tega Seiko Co., Ltd.) from the outside of the two-piece top 2.

Next, an opening / closing operation method for the manufactured awning test piece 6 will be described. An explanatory view of the opening / closing operation is shown in FIG. The opening / closing operation is performed using an apparatus conforming to the JISB7283: 1997 glasses frame repeated durability test method (discontinued on September 20, 2008). First, the angle formed between the opening / closing titanium plate 7 and the fixing titanium plate 8 of the awning test piece 6 is set to 180 °, and the fixing titanium plate 8 is fixed to the apparatus. Thereafter, two cylindrical pins 9 are arranged at a distance of 80 mm from the center of the rotation axis of the hinge 5 so that the opening / closing titanium plate 7 is sandwiched between the pins 9. Next, the pin 9 is moved about the rotation axis until the angle between the opening and closing titanium plate 7 and the fixing titanium plate 8 is 100 ° in the closing direction, and then the opening and closing titanium plate 7 and the fixing titanium plate are moved. The pin 9 is moved until the angle formed by 8 returns to the original 180 °. The opening and closing speed is arbitrary. This opening / closing operation is performed an arbitrary number of times.

Next, a method for measuring a bending moment after the opening / closing operation is performed will be described. An explanatory view of the method of measuring the bending moment is shown in FIG. After performing the opening / closing operation under arbitrary conditions, the two pins 9 are removed, and the opening / closing titanium plate 7 is moved so that the angle formed by the opening / closing titanium plate 7 and the fixing titanium plate 8 is 160 ° in the closing direction. move. Thereafter, the force gauge 10 having a hemispherical shape with a radius of 4 mm is perpendicular to the opening / closing titanium plate 7 at a position 40 mm from the rotating shaft of the opening / closing titanium plate 7 toward the opening / closing titanium plate 7. To place. Thereafter, the force gauge 10 is continuously moved in a direction in which the tip thereof contacts the opening / closing titanium plate 7, and stopped after moving at an arbitrary speed by 3 mm after contacting the opening / closing titanium plate 7. Then, the maximum load applied to the force gauge 10 during this movement is measured. A bending moment is obtained by the product of the maximum load and the distance (40 mm) from the rotating shaft to the tip of the force gauge 10. As long as the value of the bending moment exceeds 0.01 N · m, it is considered that the JIS and the eyeglass frame industry maintain the pre-treatment.

Hereinafter, typical examples of the present invention will be described. The example shows two examples of an example (Example 1) in which the sliding contact layer having the graphite-like substance exists only on one surface of the sliding facing surface and an example (Example 2) in which the sliding layer exists on both surfaces. Example 1 is the most severe example for the finish test among the combinations of the sliding facing surfaces, but a sufficient effect can be obtained as described later. Therefore, it is clear that the same effects can be obtained in combinations of sliding facing surfaces other than Example 1.

Using the hinge 5 (manufactured by Tega Seiko Co., Ltd.) having the structure shown in FIG. 1, the surface layer of the sliding facing surface of the washer 3 with the two tops 2 was carburized. The Raman spectrum obtained by performing Raman spectroscopic analysis of the carburized facing surface using an argon laser with a wavelength of 514.5 nm as an excitation source has two peaks between wave numbers 1200 cm-1 and 1800 cm-1. When a peak existing between wave numbers 1200 cm-1 and 1500 cm-1 is peak-fitted with a Gaussian function, it is confirmed that a graphite-like substance having a half-value width of 55.731 cm-1 at the peak-fitted Gaussian function is confirmed. It can be seen that a sliding contact layer having a graphite-like substance was formed.

Next, the opening / closing titanium plate 7 and the fixing titanium plate 8 are brazed to the hinge 5, and the set screw 4 is tightened with a tightening torque of 20 cN · m using a torque driver (manufactured by Tohnichi Corporation). It fixed with the cis lock nut from the outer side of the 2 tops 2. Thereafter, the fixing titanium plate 8 was fixed to the apparatus, and the opening / closing operation of FIG. 3A was performed 100 times under the condition of an opening / closing frequency of 0.5 Hz. Then, after another set of tightening of the set screw, fixing of the cis-lock nut and opening / closing operation was performed under the same conditions as above, the set screw was tightened and fixed to the cis-lock nut again under the same conditions as above, and the test specimen 6 was prepared.

Next, a post test was performed using the post test piece 6 by the method shown in FIG. The opening / closing operation of FIG. 3 (a) is performed under the condition of an opening / closing frequency of 0.5Hz, and the bending moment measurement of FIG. 3 (b) is performed under the condition of a moving speed of a force gauge (manufactured by Imada Co., Ltd.) of 0.5mm / s. went. The measurement of the bending moment was performed every 100 times of opening and closing, and after a total of 1000 times, it was performed every 500 times of opening and closing. The test was conducted until a bending moment of 0.01 N · m or less, at which it was judged that the aki and the eyeglass frame industry could not maintain the brazing, was conducted.

In addition, for comparison, a brushing test was performed under the same conditions for a case where the washer 3 was not carburized and the sliding facing surfaces were made of titanium and a case where the washer 3 was made white.

FIG. 4 shows the results of the post test. The sliding facing surfaces made of titanium are not shown in the figure because the brazing of the fixing titanium plate 8 and the two tops 2 peeled off during the initial opening and closing operation 100 times and could not be measured. This is considered to be because a large amount of wear powder was generated and seized on the sliding facing surface by opening and closing. The difference in the value of the bending moment before the opening / closing operation (opening / closing operation 0 times) is due to the dimensional accuracy of each part of the hinge 5 and the change in surface properties due to the carburizing process. From this result, it was found that the present invention can maintain the firing for a long period of time much more stably than the conventional one.

Using the hinge 5 having the same configuration as in Example 1, the opposing surfaces of the two pieces 2 and the washer 3 were each coated with titanium carbide, and the opposing surfaces were slid. As a representative, the Raman spectrum obtained by performing the same Raman spectroscopic analysis as in Example 1 on the facing surface of the washer 3 after sliding has two peaks between wave numbers 1200 cm −1 to 1800 cm −1. When a peak existing between wave numbers 1200 cm −1 and 1500 cm −1 is peak-fitted with a Gaussian function, the presence of a graphite-like substance whose half-width of the peak-fitted Gaussian function is 257.654 cm −1 It was confirmed that a sliding contact layer having a graphite-like substance was formed.

Next, a test piece 6 was manufactured under the same procedure and conditions as in Example 1, and the test of FIG. 3 was performed. FIG. 5 shows the result. From this result, it was found that the present invention can maintain the firing for a long period of time much more stably than the conventional one.

DESCRIPTION OF SYMBOLS 1 1 piece top 1a 1 piece top 1 top piece 2 2 pieces top 2a 2 pieces top 2 pieces 2b 2 pieces top 2 pieces 3 Washer 3a Sliding contact layer 4 which has graphite-like substance 4 set screw 5 Hinge 6 Finishing test piece 7 Titanium plate for opening and closing 8 Titanium plate for fixing 9 Pin 10 Force gauge

Claims (7)

A metal hinge having a pair of connecting members made of a titanium-based material and pivotally supporting the connecting members so that the connecting members can rotate with each other. A metal hinge formed of a base material and having a sliding contact layer having a graphite-like substance on at least one surface. A first frame portion is formed on one side of the connecting member and a pair of second frame portions are formed on the other side, and the sliding facing surface includes the first frame portion and the second frame portion. The metal hinge according to claim 1, which is a surface which is fitted between and abuts against each other. The sliding contact layer is made of a graphite-like substance having two peaks between wave numbers 1200 cm-1 and 1800 cm-1 in a Raman spectrum obtained by Raman spectroscopy using an argon laser having a wavelength of 514.5 nm as an excitation source. The metal hinge according to claim 1 or 2. The metal sliding hinge according to any one of claims 1 to 3, wherein the sliding contact layer includes a graphite-like substance generated by carburizing a titanium material on at least one surface of the sliding facing surface. The said sliding contact layer has the graphite-like substance produced | generated by coat | covering at least one surface of the said sliding opposing surface with titanium carbide or a titanium carbonitride, and sliding the surface with another surface. To 3. The metal hinge according to any one of items 1 to 3. 4. The metal binding according to claim 1, wherein the sliding contact layer has a graphite-like substance in which a material mainly composed of carbon is physically attached to at least one surface of the sliding facing surface. No. An eyeglass frame provided with the metal hinge according to claim 1.