JPS6365803A - Production of accessories - Google Patents

Abstract

(57) [Abstract] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a method for producing chain-shaped accessories such as necklaces and bracelets, and more specifically, a method for producing two-color inverted accessories whose upper and lower surfaces have different colors. Regarding.

[Background of the invention]

It is known that some precious metal accessories are made by combining metals of different colors to enhance the decorative effect. White types include platinum alloys and white gold, and gold types include pink, yellow, and gold alloys such as IJ7.

These multi-colored accessory parts are assembled together,
Alternatively, accessories made by joining raw materials to make a composite material and using this to create accessories are popular and are called two-tone or combination.

Among two-tone jewelry, jewelry with different colors on the top and bottom surfaces can be used in two rows depending on your preference, so it is called a two-color inversion type or reversible, and it has a particularly high commercial value.

[Prior art and problems]

Conventional two-color reversal jewelry is known to be made by stacking plate-shaped jewelry parts of different colors one above the other.
There are restrictions on the shape, and most of them are hollow (poor sense of mass).Also, attempts have been made to make two-color reversal type jewelry using composite wire or composite plate materials, which are composites of different colored alloys by pressure welding. However, there are restrictions in the molding process, and it is extremely difficult to match the colors on the top and bottom of accessories with complex shapes, which often result in accessories with a mottled pattern.

[Object and structure of the invention]

Therefore, an object of the present invention is to provide a method for manufacturing a two-color reversal type accessory in which metals of different colors are accurately exposed on the upper and lower surfaces of a chain-shaped accessory with a complex shape. A half-shell, which will become the upper surface of the annular piece, is formed by press working from a metal plate having a first color, and with this half-shell inserted into a mold, a second color, which will become the lower surface of the annular piece, is formed using the lost wax method. By casting the metal having the half-shell, two-color inverted annular pieces are formed, and the upper and lower surfaces of a large number of annular pieces are regularly arranged and connected in a chain.

Hereinafter, embodiments will be described with reference to the drawings.

〔Example〕

FIG. 3 shows a Kihei chain, which is the most common chain-shaped accessory, with FIG. 3(a) being a plan view and FIG. 3(b) being a side view. The Kihei Chain is made up of ring-shaped pieces 10 connected in a chain, but each piece is twisted in order to arrange the chains in a flat manner, and when viewed from the side, it has an approximately figure-eight shape. Although FIG. 3 is a simplified drawing for convenience of drawing, it is actually composed of complex curves.

FIG. 1 shows an annular piece constituting a two-color inverted Kihei chain produced by the method of the present invention, with FIG. 1(a) being a side view and FIG. 1(b) being a sectional view of the main part.

The upper surface portion 21 of the annular piece 20 is made of a platinum alloy, and the lower surface portion 22 is made of a gold alloy.

Such a two-color inverted annular piece 20 is created as follows.

First, using a press mold made after the original model of the circular piece,
A half shell 26 as shown in FIG. 2 is produced by pressing a platinum plate. Figure 2 shows the half shell that forms the upper surface of the circular piece.
FIG. 5(a) is a side view, and FIG. 1(b) is a sectional view of the main part.

When this half-shell 26 is inserted into the mold and a gold alloy is cast by the lost wax method on the part that will become the lower surface of the annular piece, platinum will be exposed on the upper surface 21 and the lower surface 22 will be exposed as shown in FIG. A two-color inverted circular piece with gold exposed is obtained.

Here, the lost wax method will be briefly explained.

First, liquid rubber is injected around the mold, and after the rubber hardens, it is cut into two and the mold is removed.

Next, a press-molded half-shell is inserted into the rubber mold, wax is injected into the remaining space, solidified, and then removed. Plaster is poured around the wax mold in which the half-shell and wax obtained in this way are integrated, and after it solidifies, it is heated and the wax flows out, and the half-shell is inserted into the plaster mold. In this state, a space corresponding to the lower surface portion is formed. When molten gold alloy is cast into this space by centrifugal casting, an inverted dichroic annular piece is completed, in which the half-shell serving as the upper surface and the lower surface are integrated.

Figure 4 shows the Kaku Kihei chain, which is a modification of the Kihei chain, and the same figure (a
) is a plan view, and (b) is a side view.

The Kaku Kihei chain is made up of square ring pieces 60 connected in a chain, and has an angular figure 8 shape when viewed from the side.

FIG. 5 shows square annular pieces constituting a two-color inverted square Kihei chain in another embodiment produced by the method of the present invention,
FIG. 5(a) is a side view seen from the width direction, and FIG. 6(b) is a side view seen from the longitudinal direction.

The upper surface portion 31 of the square annular piece 30 is a half shell made of a platinum alloy formed by press working, and the lower surface portion 62 is made of a gold alloy cast by a lost wax method.

FIG. 6 shows a half shell constituting the upper surface part 31 of a square annular piece 60 made by pressing a platinum plate, and FIG.
is a width direction side view, and the same figure (b) is a longitudinal direction side view.

Such a shape is optimal for press working, and it is easy to make the platinum plate used relatively thin.

In the above embodiments, the half shell is made of a platinum plate and a gold alloy is cast therein, but it is also possible to use white gold, which is a white gold alloy, instead of the platinum plate. In any case, it is preferable to construct the half-shells from a metal with a high melting point and to cast a metal with a relatively low melting point; if this is reversed, the half-shells will melt, resulting in poor casting.

When connecting annular pieces in a chain, it is necessary to put a hole in a part of the pieces and solder them after they are connected. In this case, it is possible to cast a finish that has notches in advance, but
The finish is better if processed with a slit cutter after casting.

Also, when connecting pieces in a chain, if the top and bottom corners have the same color, it will be completely reversible, but it is also possible to reverse every few pieces or combine them with pieces of a single color to create a combination. You can also do it.

Furthermore, it is not necessary to divide the volume of the piece into two halves using two-colored metals, and especially when the half shell is made of platinum, the thickness of the piece should be approximately one-fifth of the total thickness of the piece. This is preferable in terms of appearance, decoration, etc. Particularly when a thin plate is used, it is also possible to cant a part of the surface of the half shell to expose two parts of the lower surface to enhance the decorative effect.

〔Effect of the invention〕

t According to the method of the present invention, it is possible to mass-produce accessories with two-color inversion even in scale-shaped accessories with complicated shapes.
It is extremely effective in enhancing the decorative effect.
It is.

[Brief explanation of drawings]

FIGS. 1(a) and (b) are a side view and a sectional view of a main part of an annular piece in an embodiment of the present invention, and FIGS. 2(a) and [
(b) is a side view and main part sectional view of the half shell in Figure 1, Figures 3 (a) and (b) are a plan view and side view of a general Kihei chain, Figure 4 fa) and Tb ) are a plan view and a side view of a general square Kihei chain, FIGS. 5(a) and (b) are side views of a square annular piece in another embodiment of the present invention, and FIGS. It is a side view of the half-shell in Fig. 5. 20... Annular piece, 26. 66... Half shell, 60... Square annular piece. Figure (a) (b) Figure 3 (a) Figure 4 Figure 5 (a) (b)

Claims (2)

[Claims] (1) Form a half-shell that will become the upper surface of the annular piece by press working from a metal plate having a first color, and with this half-shell inserted into the mold, use the lost wax method to form a second half-shell that will become the lower surface of the annular piece. A metal having a color of is cast to be integrated with the half-shell to form a two-color inverted annular piece, and the upper and lower surfaces of a large number of annular pieces are regularly arranged and connected in a chain. A method for manufacturing accessories. (2) The method for manufacturing an accessory according to claim 1, wherein the metal having the first color is a platinum alloy, and the metal having the second color is a gold alloy.