JPH02299734A - Manufacture of hook type center finding - Google Patents

Abstract

PURPOSE:To simply manufacture the hook type center finding having a large degree of freedom as a product by bringing the opposed surface of a facing case formed integrally by blanking, drawing and bending to brazing joining. CONSTITUTION:With respect to a plate of a precious metallic material such as gold, platinum, etc., a facing case 12 whose expansion shape is a line symmetry, and also, which has a shape coupled by a connecting part 22 is brought to blanking by a press. Subsequently, drawing is executed by the press so that a cross-sectional shape of an area except a closing member inserting part 36 in the periphery of an assembly hole 26 becomes roughly a U-shape. Next, the facing case 12 of the expansion shape in which the cross-sectional U-shape is opposed is brought to bending by using the press in the connecting part 22, and the facing case 12 formed integrally is formed. Thereafter, the opposed surface of the facing case 12 bent and formed integrally is joined by brazing joining using a brazing filler metal, and the facing case is formed. On the other hand, a closing member 16 is formed by forming a step difference part 38 after blanking of an external form and formation of the assembly hole 26 and installing an elastic member 24. By inserting the closing member 16 into the facing case 12 formed in such a way, and fixing it with a pin 28, the hook type center finding is completed.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for manufacturing a hook-type clasp used for attaching and detaching accessories such as watches, bracelets, and nettans.

[Background of the invention]

The structure of the hook-type clasp will be explained using FIG. 5.

FIG. 5(a) shows the outer case, and FIG. 5(b) shows the closing member. The hook-shaped exterior case 12 has an accessory mounting hole 40 for attaching one end of the accessory, an opening 14 for attaching and removing the other end of the accessory, and a closing member insertion portion 66 into which the closing member 16 is inserted. Furthermore, an assembly hole 26 for assembling the outer case 12 and the closing member 16 is provided. The closing member 16 has a closing piece 18 at one end and an operating piece 20 at the other end, and an elastic member 24 that biases the opening 14 of the exterior case 12 to close with the closing piece 18 is attached to the step around the assembly hole 26. It is provided in the section 38.

FIG. 4 shows a state in which the outer case and the closing member are combined. The closing member 16 is inserted into the closing member insertion portion 66 of the outer case 12.
The outer case 12 and the closing member 16 are connected by inserting the pin 28 into the assembly hole 26 provided on both sides and applying force 7 to prevent the bottle 28 from falling. When the operating piece 20 of the closing member 16 is pressed in the direction of the arrow 60, the closing member 16 rotates around the bottle 28, and the closing piece 18 of the closing member 16 moves in the direction of the arrow 62, so that the opening 14 is closed. spread. The width of the opening 14 is utilized to attach and detach accessories.

When the pressure on the operating piece 20 is released, the closing piece 18 returns to its original state due to the action of the elastic member 24 shown in FIG. 5, thereby preventing the accessory from slipping out. When wearing the accessory, the closing piece 18 may be pressed in the direction of the arrow 62.

[Conventional technology and its issues]

The outer case of the hook-type clasp is manufactured using a casting method, particularly a lost wax casting method.

This lost wax casting method involves forming a coating layer of refractory material around a wax model model that is the same as the product to be cast, then heating the entire structure to melt only the wax model model to form a mold. It is formed by pouring molten metal into a mold. For this reason, the lost wax casting method is a manufacturing method suitable for easily manufacturing small quantities of products with complex shapes.

However, the lost wax casting method has the problem that the manufacturing process is long and that the wall thickness of the product cannot be made extremely thin in order to pour the molten metal into the entire mold without making any cavities.

It is an object of the present invention to solve the above-mentioned problems and provide a method for manufacturing a hook-type clasp using a simple manufacturing method and with a high degree of product flexibility.

[Means to solve the problem]

The outer case of the hook type clasp of the present invention is manufactured by the steps described below.

There is a punching process in which the expanded shape of the plate material is line-symmetrical and connected at the connecting part, and a drawing process in which the cross-sectional shape of the area is shaped into a U-shape (excluding the closing member insertion part where the closing member is inserted). , a bending step of bending and integrating the outer case at the connecting portion, and a joining step of brazing the opposing surfaces of the folded and integrated exterior case.

〔Example〕

The present invention will be described in detail below using the drawings.

FIGS. 1(a) to 1(C) are plan views showing the method of manufacturing a hook type clasp according to the present invention in order of steps.

First, as shown in Fig. 1 (al), plates made of precious metal materials such as gold and platinum with a thickness of 0.1 mm to 0.3 M are formed with a line-symmetrical developed shape and connected at connecting parts 22. The exterior case 12 is punched out using a press. At the same time as this punching process, an assembly hole 26 and an accessory mounting hole 40 are formed.

Next, as shown in FIG. 1(b), drawing is performed using a press so that the cross-sectional shape of the area around the assembly hole 26 excluding the closing member insertion portion 66 becomes approximately U-shaped.

Next, as shown in FIG. 1(C) 5, the unfolded outer case 12 is bent using a press at the connecting portion 22 so that the U-shaped sections face each other to form an integrated outer case 12. Thereafter, the opposing surfaces of the folded and integrated exterior case 120 are joined by brazing using collage material to form the exterior case 12.

On the other hand, the closing member 16 shown in FIG. 5(b) is formed by forming a stepped portion 38 by pressing after cutting the outer shape and forming the assembly hole 26.
The elastic member 24 is attached and formed.

The closing member 16 is attached to the outer case 12 formed in this way.
, insert the bottle 28 into the assembly hole 26', and make sure that the bottle 28 does not fall out when pulled out.The hook-type clasp as shown in FIG. 4 is completed.

In the above description, the connecting part is formed on the side facing the opening of the outer case, but as shown in FIG. Even 12 is fine.

Further, although an example has been described in which the assembly hole and the accessory mounting hole are formed simultaneously with the outer case punching process, the assembly hole and the accessory mounting hole may be formed by machining after the outer case is bent and integrated.

In addition, the closing member is shown in FIG. 2(a), which is a plan view, and in FIG.
5, instead of forming an assembly hole, an assembly bin 64 matching the diameter of the assembly hole of the outer case may be integrally formed by press working and used as the closing member 16. The closing member 16 forming the assembly bin 64 is inserted into the outer case at the same time as the outer case is bent.

〔Effect of the invention〕

As is clear from the above explanation, most of the processes for the hook type clasp according to the present invention can be performed by press working, so the manufacturing process is simple, and moreover, the hook type clasp can be formed from a plate material by press working. Therefore, there are no restrictions on wall thickness when forming by casting, and the degree of freedom in products becomes greater.

Therefore, the thickness of the hook-type clasp can be made thinner, and the weight of the clasp is lighter (combined with the fact that it can be formed by press processing),
This has the effect of making it possible to manufacture hook-type clasps at low cost.

[Brief explanation of the drawing]

FIGS. 1(a) to (C) are plan views showing the manufacturing method of a hook-type clasp according to an embodiment of the present invention in order of steps, FIG. 2 shows a closing member in an embodiment of the present invention, and FIG. a) is a plan view, FIG. 2(b) is a sectional view taken along the line A-A in FIG. 2(a),
FIG. 3 is a plan view showing a hook type clasp in another embodiment of the present invention, FIG. 4 is a perspective view showing a hook type clasp,
5(a) and 5(b) are plan views showing the hook type clasp shown in FIG. 4 in an exploded state. 12... Exterior case, 16... Closing member, 18... Closing piece, 20... Operation piece, 22... Connection portion. Figure 2 (Q) (b) Figure 3

Claims (1)

[Scope of Claims] A hook-shaped exterior case having an opening, and a closing member including a closing piece and an operation piece, the closing member being inserted into the exterior case and closing the opening of the exterior case. In the hook type clasp, which is biased by an elastic member so as to stop the outer case, the outer case is formed by a punching process in which the expanded shape of the plate material is processed into a shape that is line-symmetrical and connected at a connecting part, and a process in which the closing member is A drawing process in which the cross-sectional shape of the area excluding the insertion part of the closing member to be inserted is shaped into a U-shape, a bending process in which the area is bent and integrated at the connecting part, and a facing surface of the outer case that is bent and integrated is waxed. A method for manufacturing a hook-type clasp, comprising the step of joining.