JP3221218B2 - Pure gold ornament clasp - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to various fasteners for pure gold ornaments, such as a stopper for a pure gold necklace or a bracelet, and a stopper pin for a pure gold brooch.

[0002]

2. Description of the Related Art Conventionally, to manufacture gold ornaments such as necklaces, bracelets, brooches, etc., it is necessary to add Ag, C
K containing 25 to 40% of u, Ni, Pd, Zn, etc.
A 14 gold alloy or a K18 gold alloy is used. But,
In recent years, necklaces, bracelets, and brooches made of pure gold have been marketed as pure gold ornaments.

[0003]

However, various fasteners such as a stopper for connecting a necklace or a bracelet of these pure gold ornaments or a pin for fastening a broach to clothes have a purity of 99% by weight or more than usual. Since pure metal has insufficient spring property, only the metal fittings must be made of another metal or alloy having excellent spring property. However, the purchasers who purchase and sell the ornaments sold as pure gold ornaments are all 9 including the fasteners of the ornaments.
Misunderstood that it is made of pure gold having a purity of 9% by weight or more, so it must be explained at the time of sale that only the fasteners are made of other metals or alloys. There was also a risk of being displayed.

[0004]

Means for Solving the Problems Accordingly, the present inventors have:
From this point of view, as a result of researching to use pure gold also for the stoppers, pure gold having a purity of 99% by weight or more was made to contain 200 to 2000 ppm of Ca as a percentage of the whole, and further, 10 to 10 parts by weight of Mg. It has been found that pure gold having a composition containing 1000 ppm has remarkably improved spring properties and can be sufficiently used as a stopper.

The present invention has been made on the basis of this finding, and it has been proposed that pure gold having a purity of 99% by weight or more contains 200 to 2,000 pp of Ca in total.
m and Mg: a fitting for a pure gold decorative article having a composition containing 10 to 1000 ppm.

In the metal fittings of the present invention, the purity of the pure gold is set to 99% by weight or more. If the purity is less than 99% by weight, the golden tone of the pure gold is impaired and the sense of quality is high. Is lost. Further, if the content of Ca is less than 200 ppm in the whole, pure gold is not sufficiently cured, so that the spring property required as a stopper is not obtained. On the other hand, if the content exceeds 2000 ppm, the color tone becomes slightly cloudy. This is not preferable because further improvement of the spring property cannot be obtained. Therefore, the content of Ca is 200 ppm to 2000 p
pm. A more preferred range is 800 to 1800
ppm, and an even more preferred range is 1000 to 1000 ppm.
1600 ppm.

The reason why the content of Mg is limited to 10 to 1000 ppm in the whole is that if the content of Mg is less than 10 ppm, the desired spring property cannot be obtained. The color tone deteriorates,
It is not preferable because further spring property cannot be obtained. Therefore, the content of Mg is set to 10 ppm to 1000 ppm. A more preferred range is 100-500 ppm,
An even more preferred range is from 200 to 300 ppm.

[0008]

EXAMPLES Pure gold having the purity shown in Table 1 was melted by a normal vacuum melting furnace, and a small amount of Ca and Mg components were added to the pure gold in a ratio shown in Table 1 in a proportion of the total, thereby obtaining The obtained pure gold melt was cast to produce an ingot having dimensions of width: 65 mm, length: 150 mm, and thickness: 18 mm. These pure gold ingots are cold-rolled to a thickness of 0.5 mm, and cut into thin plates having a width of 10 mm and a length of 150 mm. A pure gold member was produced. Spring limit values (Kb values) of these metal fittings 1 to 14 of the present invention, comparative metal fittings 1 and 2 and conventional pure metal were repeatedly measured by a bending tester, and the results are shown in Table 1.

[0009]

[Table 1]

From the results shown in Table 1, it can be seen that all of the metal fittings 1 to 14 of the present invention have a much higher spring limit value than the conventional pure metal member, and thus can be sufficiently used as a stopper. However, the comparative metal member 1 containing Ca and Mg less than the scope of the present invention does not have sufficient resilience, while the comparative metal member 2 containing Ca or Mg beyond the scope of the present invention is It can also be seen that the luster of the pure gold is lost, which is not desirable.

[0011]

As described above, the fastener of the present invention
When used as a fastener for a pure gold decorative article, it is possible to provide an all-pure gold decorative article that has never been seen before, thereby facilitating purchasing and providing an excellent effect on the decorative industry.

Continuation of the front page (56) References JP-A-7-70671 (JP, A) JP-A-7-242961 (JP, A) JP-A-7-242962 (JP, A) JP-A-7-242963 (JP) , A) Hikaru Hei 3-33511 (JP, U) (58) Field surveyed (Int. Cl. ⁷ , DB name) C22C 5/02 A44C 27/00

Claims (1)

(57) [Claims] 1. A stopper for a pure gold decorative article, characterized by having a composition containing 200 to 2000 ppm of Ca and 10 to 1000 ppm of Mg in a proportion of the total to pure gold having a purity of 99% by weight or more. .