JP3045416U - Metal eyeglass front parts - Google Patents

Abstract

(57) [Summary] [Objective] To provide a spectacle frame excellent in strength. [Constitution] A metal plate is punched out by press working and appropriately cut to obtain a front having a rim and a bridge integrated and having a certain metal crystal orientation. [Effect] There is no brazing between the bridge and the rim, there is no strength deterioration due to heat history, and the material strength is improved especially in the direction where force is applied due to crystal orientation.

Description

[Detailed description of the invention]

[0001]

[Industrial applications]

 The present invention relates to an improvement in a front part of an eyeglass frame.

[0002]

[Prior art]

 From ancient times, metal spectacle frames have been made by brazing. Although this is a traditional manufacturing method, there are problems such as a decrease in strength due to the heat history of the metal and suitability for brazing. For example, even if brazing stainless steel, stable bonding strength cannot be obtained stably, and aluminum alloys and magnesium alloys cannot be brazed with different kinds, and the bonding strength is low even with the same kind of metal. Conversely, nickel silver used frequently for eyeglass frames has high brazing strength, but may become dull when heated by brazing.

[0003] On the other hand, attempts have been made to make a spectacle frame with a small brazing. For example, an extruded material having the cross-sectional shape of the front part of eyeglasses is made, sliced and used as front parts. The brazing between the bridge and the rim can be omitted, for example, aluminum alloy can be used for the material. However, expensive special dies are required due to the extrusion of the special structure, and if they are not mass-produced, they cannot compete with the conventional eyeglass frames at a price. Nevertheless, the number of eyeglass frames cannot be sold in a functional-only fashion, so if you change the design every season in accordance with the trend, you will have to change the dice each time, and you will have to spend a lot of money. In addition, since the sales vary greatly depending on whether or not the design is appropriate, if eyeglass frames of various designs are available to avoid risks, it will be too costly. After all, the method of using the extruded material was not practical and was difficult to put into practical use. Since extrudability makes it impossible to use materials other than aluminum alloys, there is also the problem of contact resistance when plating precious metals.

[0004] Conversely, elimination of the brazed portion by casting has been put to practical use. Usually, the front part is integrally cast by die casting to reduce the brazing part. However, slender eyeglass frames are difficult to manufacture due to the problem of hot water, and are not suitable for recent trends. In the case of spectacle frames, large deflection is required in actual use, so even a small casting defect can lead to destruction. There is also a problem that the die-casting type is more expensive than a conventional type for manufacturing eyeglass frames.

[0005]

[Issues to be solved by the invention]

 The present invention has been made in view of the above-described problems, and has as its technical task to realize a spectacle frame with a low mold cost and a sufficient strength even in a slender shape while reducing brazing.

[0006]

[Means for Solving the Problems]

 In the following, the means adopted to solve the above problems in the present invention will be described. In the metal press working, the crystal structure is rubbed, and at least a part of the rubbing direction is directed to the outside of the part, while the cutting process is performed. A bevel groove is formed in the bridge, and the bridge and the rim are integrated.

In the present invention, the direction of the metal crystal of the part is given by pressing. Specifically, the crystal is crushed outward for a long time. Destruction of the front of the glasses is often due to repeated bending forces on the curved front surface. However, if the long crushing direction of the crystal aligns outward, the strength increases in the direction that resists the bending force of the front. For this reason, it is possible to obtain a part stronger than before, and withstand a thinner shape. It is common practice to use a bevel groove to fix the lens, but in order to machine the bevel groove with a general cutting machine, it is necessary to design the part thick so that it can be easily fixed. On the other hand, in the present invention, burrs are inevitably formed on the outer edge of the component by performing the processing of crushing the crystal outward. Thanks to the extension of burrs, even when the final part is slender, when machining the bevel groove, the object to be processed is thicker than the final part, making it easier to fix. Naturally, this burr is removed after cutting the bevel groove and does not get in the way.

[0008]

Hereinafter, the present invention will be described based on embodiments.

[0009] The white sheet material is punched and pressed to obtain parts, and an intermediate product having a substantially front outer shape is obtained. In practice, the intermediate product is slightly larger than the front configuration consisting of left and right rims and bridges. This intermediate product is further press-worked, rounded to the outer edge to project burrs outward, and the whole is curved to provide a front curve and a lens curve. As a result of this pressing, the crystal structure extends long in the direction of rubs and burrs (that is, outward). After that, punching and pressing are performed again, and the right and left rim-equivalent portions are opened in the form of lenses to obtain a front original shape.

[0010] After fixing the burr of the front original shape with a plate retainer, the inner periphery of the rim-equivalent portion RR is cut to form a bevel groove. Further, the inner periphery of the portion where the bevel groove is formed is chucked, and burrs on the outer periphery of the rim-equivalent portion RR and the bridge-equivalent portion B are cut off to obtain the front part 1.

[0011] A split-type yoke is brazed to both ends of the front part 1, and the vicinity of both ends of the front part 1 is cut up and down together with the yoke. Also, braze the pad feet. After that, the upper and lower cut ends are screwed and barrel polished.

[0012] Thereafter, the temple is pivoted on the yolo, barrel polishing is performed again, electrolytic polishing, decorative plating is performed, a modern, pad is attached, and the temple is bent to finish the spectacle frame.

[0013]

[Effect of the invention]

 As described above, the front part of the present invention improves the strength by using the directionality of the metal crystal by press working, and enables the part to be slim. Also, by giving the crystal directionality, the burrs extended at the same time, and even in the slim case, the parts could be fixed when cutting the bevel groove. As described above, the front part of the present invention achieves a combined effect different from that of the conventional one-piece front, and has high industrial utility value.

[Brief description of the drawings]

FIG. 1 is a front view of an embodiment front part.

FIG. 2 is a plan view of an example front component.

[Explanation of symbols]

 1 Front parts R rim B bridge

Claims (1)

[Utility model registration claims] 1. A metal forged spectacle part, wherein a left and right rim and a bridge are integrally connected and have a rub of a crystal structure by press working, and at least a part of the direction of the rub is one in the outer edge direction of the part. On the other hand, a metal spectacle front part characterized by being provided with a bevel groove formed by cutting inside the left and right rims.