JPS5923538Y2 - Jewelry binding device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a new and improved binding device for jewelry such as necklaces, bracelets, pendants, etc. that utilizes the attractive force of permanent magnets.

Conventionally, there have been many known coupling devices for jewelry that utilize permanent magnets, but these conventionally known coupling devices generally consist of two circular permanent magnets that are arranged facing each other so that the magnets attract each other. It was a structural thing.

However, in such conventional coupling devices,
Since there is a relatively large amount of leakage magnetic flux between the magnets, the bonding force between them is weak, and the permanent magnets are subjected to a demagnetizing effect due to repeated attachment and detachment, resulting in a disadvantage that the bonding force gradually decreases.

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.

The present invention addresses the problems with the conventional products and provides a new and improved binding device for jewelry that is small and compact and has sufficient binding force. At the bottom of the open bottomed cylindrical body, a magnetic attraction element consisting of a single permanent magnet and a pair of magnetic yoke pieces, each of which attracts and holds the magnetic yoke pieces on both end faces of the magnet in the direction of the magnetization axis, The magnetization axis is fixedly arranged to match the radial direction of the cylindrical body, and the bridge is in contact between the end faces of the pair of magnetic yokes in the open side space of the bottomed cylindrical body to form a closed magnetic circuit. It is made by detachably inserting a magnetic attraction element.

The apparatus of the present invention will be described in detail below with reference to the accompanying drawings.

1 and 2 both illustrate typical embodiments of the present invention, in which these coupling devices are made of a bottomed cylindrical material made of a non-magnetic material such as precious metal, aluminum or plastic material. It consists of a body 1, a magnetic attraction element 2 fixedly arranged at the bottom of the cylindrical body, and a magnetic attraction element 3 made of, for example, iron and detachably inserted into the interior of the cylindrical body 1 from the open end. The cylindrical body 1 and the magnetic attraction element 3 are each provided with rings 4 and 5 for connecting a necklace or the like in an annular manner.

The magnetic attraction element 2 in FIG. 1 is fixed to the bottom of the bottomed cylindrical body 1 with an adhesive or the like, and the magnetic attraction element 2 in FIG. It is fixedly disposed within the cylindrical body by engaging and screwing the plug body 1b as the bottom part.

The magnetic attraction element 2 in the device of the present invention includes a permanent magnet 21 and a pair of magnetic yoke pieces 22 made of a ferromagnetic material such as iron, which are arranged in contact with both end faces of the permanent magnet 21 in the magnetization axis direction (see arrow).
22, and when the magnetic adsorption element 3 is brought into contact between the end faces of these magnetic yoke pieces in a bridge state, the permanent magnet 21
, a closed magnetic circuit (dotted line loop) is constructed between the two yoke pieces 22, 22 and the magnetic attraction element 3.

In general, alnico magnets and ferrite magnets are commonly used as permanent magnets in conventional products of this type.
In the present invention, it is desirable to use, for example, a rare earth cobalt permanent magnet, which has high coercive force, high residual magnetic flux density, and high energy product, making the coupling device smaller, lighter, and more decorative. It can be made into

For example, the maximum energy product (BH) m of an alnico magnet
ax is about 6MGOe, 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, 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.

As explained above, in the coupling device of the present invention, a permanent magnet is placed between a pair of magnetic yokes, and a magnetic adsorption element is brought into contact between the end faces of these yokes to form a closed magnetic circuit between them. Because of this, there is almost no leakage magnetic flux during coupling, and the attractive force of the magnet can be used almost completely, so it can be made compact and yet have a strong coupling force. Because it is structured to be inserted into the open side space of the bottom cylindrical body, the magnetic attraction element moves only in the axial direction of the cylindrical body, and the attraction force of the magnet can always be used almost completely to improve the connection. is held securely, and therefore has great practical value as a binding device for jewelry.

[Brief explanation of the drawing]

1 and 2 are cross-sectional views each showing a typical embodiment of the coupling device of the present invention. DESCRIPTION OF SYMBOLS 1...Bottomed cylindrical body, 2...Magnetic attraction element, 21...Permanent magnet, 22...Yoke piece, 3...・Magnetic adsorption element, 4°5...
・Anchoring ring.

Claims (1)

[Scope of utility model registration request] At the bottom of the bottomed cylindrical body with one end open, there is a magnetic attraction element consisting of a single permanent magnet and a pair of magnetic yoke pieces, each of which attracts and holds the magnetic yoke pieces on both end faces of the magnet in the direction of the magnetization axis. , the magnetization axis is fixedly arranged to coincide with the radial direction of the cylindrical body, and the bridge contacts between the end faces of the pair of magnetic yokes in the open side space of the bottomed cylindrical body to form a closed magnetic circuit. A coupling device for accessories, which is formed by detachably inserting the magnetic adsorption elements.