JPS60184465A - Joining method of member for spectacle frame - Google Patents

Abstract

PURPOSE:To obtain a joint part where the joining parts of metallic members for a spctacle frame to be joined to each other are securely joined over the entire part by tack-welding said members by spot welding and brazing the two tack- welded members around the spot weld. CONSTITUTION:This invention relates to a spectacle frame made of metallic Ti in which a mounting frame 3 of a pad 2 is pressed to a lens frame 1 and a joint point 4 is first tack-welded by spot welding in the stage of attaching, for example, the pad 2 to the frame 1. The frames are then brazed in the wide area around the joint spot 4 to fill the every small space 5 around the spot 4 with a brazing material 6. The production of the spectacle frame having the joint part securely joined over the entire part is thus made possible and the generation of torsion, bend, etc. is obviated.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a joining method for joining frame members such as left and right lens frames, their connecting fittings, and nose pads to each other during the manufacture of eyeglass frames.

In recent years, many frames made of metal have been used as eyeglass frames because they are highly decorative, lightweight, and strong. If titanium is used as the metal material, it can be made even lighter and stronger.

However, when forming eyeglass frames from titanium metal, it is generally very difficult to join the titanium metal materials, making it difficult to join eyeglass frame components such as lens frames, their connecting fittings, and nose pads. With this joining method, it is not possible to obtain sufficient joining strength for eyeglasses.

That is, in the case of brazing, although there is an advantage that the joint area can be increased, the joint strength cannot be increased very much, and the joint part is likely to peel off due to the action of external force. In addition, although spot welding can achieve greater joint strength than brazing, the joint area is very small and gaps are formed in most of the joints, so it is difficult to Twisting and bending are likely to occur.

The above-mentioned problems are particularly noticeable when glasses frames are made of titanium metal, but they also occur when glasses frames are made of other metal materials.

The present invention aims to provide a joining method that can easily join metal eyeglass frame members with extremely high strength, and the eyeglass frame members to be joined to each other are temporarily joined by spot welding. , the temporarily joined members are brazed around the welding points.

According to the joining method of the present invention, after the joint is temporarily joined by spot welding, the area around the welding point is brazed, so that the shortcoming of spot welding, which is the small joint area, can be avoided by brazing. On the other hand, the drawback of low joint strength is compensated for by spot welding, and the advantages of both can be combined to obtain a very high joint strength.

Hereinafter, the bonding method of the present invention will be described with respect to the case of bonding a lens frame and a nose pad as a member for an eyeglass frame.

In FIG. 1, numeral 1 indicates a lens frame for attaching a lens, and numeral 2 indicates a nose pad, both of which are made of titanium metal.

” - If the nose pad 2 can be placed on the lens frame 1, the second
As shown in the figure, when attaching the nose pad 2 (the Q frame 3 is brought into contact with the lens frame 1 and the joints are temporarily joined by spot welding. This spot welding can be performed by a well-known method such as electric resistance welding. As a result, a small gap 5 is formed around the welding point 4 in the temporarily joined joint.

Next, the temporarily joined joint is brazed over a wide area around the welding point 4. Through this brazing, the gap 5 is filled with the brazing material θ, and the entire joint is firmly joined. In other words, the necessary joint strength is mainly secured by spot welding, and since the strength due to soldering is added to this, the overall joint strength becomes very large.
The drawback of spot welding having a small joint area is compensated for by brazing, and since a sufficient joint area is ensured, twisting or bending of both members at the joint is less likely to occur.

It should be noted that the bonding method described above can also be applied to the bonding of the left and right lens frames 1 and the connecting frame 7 that connects them, the bonding of the lens frame 1 and the mounting bracket 8, etc. Needless to say, the present invention can also be effectively applied to cases where each of the above members is made of metal other than titanium.

[Brief explanation of the drawing]

FIG. 1 is a partial rear view of glasses to which the method of the present invention is applied, and FIG. 2 is an enlarged view of the main parts thereof. 1... Lens frame, 2"4% contact, 4... Welding point. Patent applicant: Shigeo Mizushima

Claims (1)

[Claims] 1. A method for joining spectacle frame members, which comprises temporarily joining the spectacle frame members to be joined to each other by spot welding, and brazing the temporarily joined members around the welding points.