JPS5843868Y2 - Binding device for jewelry - Google Patents

Description

[Detailed description of the invention] The present invention is a new and improved device for connecting accessories such as necklaces, bracelets, and pendants, which utilizes the attractive force of permanent magnets, and which is particularly easy to attach and detach, and which provides high bonding strength. This invention relates to a coupling device.

Conventionally, many devices using permanent magnets have been known as binding devices for jewelry, but these conventionally known binding devices generally consist of two identical permanent magnets or a permanent magnet and an attraction piece facing each other. It was designed to be placed and integrated by adsorption.

However, in such conventional coupling devices,
Since the leakage magnetic flux of the magnetic circuit is relatively large, the bonding force is weak, and the permanent magnet is subjected to a demagnetizing effect due to repeated attachment and detachment, which causes the bonding force to gradually decrease.

To improve this drawback, a relatively large permanent magnet is required, but in this case the binding device becomes large, making it difficult to suit the design as a binding device for jewelry, and it also This gives the impression of a foreign body, making it impractical.

In view of the problems with the conventional products, the present invention provides a new and improved accessory binding device that is small and non-bulky and provides sufficient binding force.
This consists of a bottomed cylindrical body with a permanent magnet piece fixed to the bottom and a rod-shaped attraction piece that is removably inserted into the cylindrical body. A locking ring for chain connection is provided, and a slit opening toward the open end is provided in the body portion on the opposite side of the locking ring, and a locking ring for chain connection is provided on a part of the outer surface of the adsorption piece that protrudes from the slit. This is what happens.

Hereinafter, the coupling device of the present invention will be described in detail with reference to the accompanying drawings.

FIGS. 1 and 2 show a typical embodiment of the device of the present invention. It is composed of a rod-shaped attraction piece 2 made of a ferromagnetic material such as iron.

A permanent magnet piece 3 is fixed to the bottom of the bottomed cylindrical body 1, and a locking ring 4 for connecting an accessory chain (not shown) is provided on a part of the outer surface of the body. Furthermore, a slit 5 is provided on the opposite side of the locking ring.

On the other hand, the rod-shaped suction piece 2 is provided with a locking ring 6 that corresponds to and has the same shape as the locking ring 4, and this locking ring 6 has a slit when the suction piece 2 is inserted into the cylindrical body 1. It is designed to protrude from 5.

To use the coupling device of the present invention having the above structure, it is only necessary to insert the rod-shaped attraction piece 2 into the inside of the cylindrical body 1 and bring the attraction piece 2 into contact with the permanent magnet piece.

Therefore, when the coupling device of the present invention is incorporated into an accessory and actually used, the tension acting on the coupling device through the chains connected to the two retaining rings 4 and 6 is in the direction of the arrow W shown in the drawing. Since it does not act in any direction to separate the permanent magnet piece 3 and the attraction piece 2, a strong bonding force that is completely unrelated to the bonding force due to the permanent magnet piece 3 can be obtained.

As the permanent magnet used in the present invention, it is of course possible to use alnico magnets and ferrite magnets that are used in conventional products of this type, but in the present invention, for example, rare earth cobalt-based permanent magnets may be used. This rare earth cobalt based magnet has high coercive force, high residual magnetic flux density, and high energy product, so the coupling device can be made smaller, lighter, and more decorative.

For example, the maximum energy product (BH) m of an alnico magnet
ax is about 5MGOe, whereas Sm (Co, Cu, Fe), which is one of the rare earth cobalt-based permanent magnets,
5 has an energy product of about 25 MGOe(7), so if the same bonding force is to be obtained, the size of the magnet can be made smaller than that of an alnico magnet by about 2.about.÷.

As explained above, although the binding device of the present invention uses a permanent magnet, the tension that acts on the binding device through the chain of the accessory during use has no relation to the attractive force of the permanent magnet. Since a high mechanical bonding force can be obtained, and in addition, this coupling device is easy to attach and detach, and is compact, it has great practical value as a coupling device for jewelry.

[Brief explanation of the drawing]

The drawings illustrate typical embodiments of the accessory binding device of the present invention, in which FIG. 1 is a sectional view taken along the line I-I in FIG. 2, and FIG. 2 is a sectional view taken along the line II--II in FIG. FIG. 1...Bottomed cylindrical body, 2...Adsorption piece, 3
...Permanent magnet, 4... Ring ring, 5...
...slit, 6... ring.

Claims (1)

[Scope of utility model registration request] It consists of a bottomed cylindrical body with a permanent magnet piece fixed to the bottom and a rod-shaped adsorption piece that is detachably inserted into the cylindrical body, and is chained to a part of the outer surface of the body of the cylindrical body. An accessory is provided with a locking ring and a slit opening toward the open end on the opposite side of the body, and a chain connecting ring is provided on a part of the outer surface of the suction piece and protrudes from the slit. Coupling device for.