JP3993589B2 - Magnetic clasps in jewelry - Google Patents

Description

  The present invention relates to a magnetic clasp using magnetic pairs that can be magnetically attracted to each other and used for connecting members in jewelry.

  For example, the clasp used in necklaces has a structure that pulls, hook-type clasp, center-folded clasp, plug-in type clasp, etc., and opens and closes a part and hooks it onto the mating bracket and keeps it closed by the spring force. Things are common. However, the conventional one has a manufacturing problem that it is difficult to obtain accuracy in terms of structure, and there is a problem that when a strong force is applied, a problem such as breakage or poor movement easily occurs. In addition, the operability is not very good because the opening / closing operation for hooking a small lever with a nail is performed on the back side of the neck.

  Therefore, for example, Japanese Patent Application Laid-Open No. 2003-61717 has been proposed as a connection fitting using a magnet. However, the structure in which the magnetic pairs are abutted as in the invention of the same issue is effective for the force F1 that is pulled away in the direction opposite to the magnetic adsorption direction as shown in FIG. 4, but as shown in the lower part of FIG. The force F2 that pulls away in the tilt direction rotates around the point O, so that it is less effective and easily deviates. In FIG. 4, the magnets are indicated by symbols M and M ′, the case is indicated by symbols C and C ′, and the connecting ends are indicated by symbols D and D ′. On the other hand, in Japanese Patent Application Laid-Open No. 2000-325117, a locking protrusion and a hole for fitting it are provided in a magnetic pair that is magnetically attracted to prevent lateral displacement from the attracting surface. The problem due to the force F2 in the tilt direction shown below cannot be prevented.

JP 2003-61717 A JP 2000-325117 A

The present invention has been made paying attention to the above points, and an object of the present invention is to provide a magnetic clasp in jewelry that can easily and reliably perform a detaching operation. Another object of the present invention is to provide a magnetic clasp in a jewelry that cannot be removed unless it is pulled with an appropriate force.

In order to solve the above-described problems, the present invention provides an opening serving as a separation end of a pair of separable connection cases for a magnetic clasp using magnetic pairs that can be magnetically attracted to each other and used for connecting members in jewelry. In addition, a pair of magnetic pieces constituting a magnetic pair are attached to each other so that the pair of connection cases can be connected by the magnetic force of the magnetic pair on the opening side, and can be separated only when the pair of connection cases are pulled apart left and right. a yoke and provided on the outside of the connection case, to set the magnetic attraction to that so as not to separate working force of the inclined direction to the magnetic pair, connecting the case and the clearance fit the form of loose fit to the yoke This is a measure taken.

  The magnetic clasp in the jewelry of the present invention uses a magnetic pair to connect the members and members, or the components and components, and other members that repeat attachment and detachment in the jewelry. In common with conventional magnetic clasps. The magnetic pair in the present invention is a pair of combinations that can be coupled by magnetic force, and includes a combination of so-called permanent magnets or a combination of a permanent magnet and a ferromagnetic material.

  The magnetic pair in the present invention is composed of a pair of separable connection cases and a pair of magnetic pieces respectively attached to an opening which is a separation end of the connection case, and the pair of connection cases is on the side of each opening. Can be connected by magnetic force. A yoke is provided outside the pair of connection cases so as to be separable only when the pair of connection cases are separated from each other to the left and right, and otherwise the separation is prevented.

  That is, a gap between the connection case and the yoke is provided to a minimum so that an external force in the tilt direction does not act on the magnetically attracted magnetic pair. Since the yoke surrounds the outside of the connection case with a gap necessary for connection and separation, even if the magnetic pair is separated, the separation is prevented until the magnetic attractive force of the magnetic pair is exceeded.

  Therefore, the connection case and the yoke have a close relationship in form. When the connection case is a capsule type, it is desirable that the yoke is a cylindrical type into which the capsule can be inserted. One of the connection cases and the yoke are fixed by appropriate means such as brazing or caulking, for example. Further, the yoke is formed using a ferromagnetic material or a magnetic metal, thereby forming a magnetic circuit between the magnetic pair and further improving the effect of magnetic attraction.

  Since the present invention is configured and operates as described above, it can be connected and separated by magnetic force by contacting and separating the magnet pieces constituting the magnetic pair. It is not necessary to operate the lever with the tip of the toe, so the operability is good, and those in the connected state can be removed by pulling with moderate force, but it will not come off even with the weight of jewelry So easy to handle.

  Hereinafter, the magnetic clasp of the jewelry according to the present invention will be described in more detail with reference to the illustrated embodiment. The jewelry 10 is in the shape of a necklace as illustrated in FIG. 3, and the magnetic clasp 12 of the present invention is applied to connect the end portions of the jewelry member 11 into an annular shape.

  FIG. 1 shows an embodiment of a magnetic clasp 12 according to the present invention, in which a magnetically attractable magnetic pair is composed of a pair of magnetic pieces 13 and 14 made of magnets. The magnetic pieces 13 and 14 are fixed so that they do not come out and do not move to the back by being fitted into a pair of connection cases 15 and 16 and crimping the edges of the openings 17 and 18. ing.

  The illustrated magnetic pieces 13 and 14 have a short cylindrical shape, and the connection cases 15 and 16 for containing the magnetic pieces 13 and 16 have a cylindrical shape with one end opened and the other end closed, and the magnetic pieces 13 and 14 are accommodated in the connection cases 15 and 16. It has a shape structure that fits snugly and is fixed in place by caulking processes 17 and 18. The connection cases 15 and 16 may be made of any material, but the illustrated case is made of a metal material that does not have ferromagnetism and is plastically processed. The magnetic pieces 13 and 14 may be attached to the connection cases 15 and 16 by adhesion, or the connection cases 15 and 16 may be formed of a ferromagnetic metal.

  A yoke 19 is provided outside the connection cases 15 and 16. The yoke 19 is formed of a part formed in a cylindrical shape so that one end which is a separation end of the connection cases 15 and 16 is accommodated therein, and in the case of the embodiment, one connection case (right case 16 in the example). And the other connection case 15 is received in the end opening 21. The method of inserting the other connection case 15 into the yoke 19 attached to one connection case 16 takes a fitting form of clearance fit with a gap (gap) between them, but the degree of the gap is easy to insert. Because the other connection case does not incline with respect to the yoke when it is pulled apart to the left and right, it is always held with the magnetic attraction force set, and it is a fitting that is difficult to come off accidentally ing.

  The yoke 19 can be formed using the same metal material as the connection cases 15 and 16 and is used for mechanical fitting with the other connection case 15. However, the yoke 19 can be used as a member constituting a magnetic circuit. In this case, the yoke 19 is formed using a ferromagnetic material. Thereby, not only the magnetic pieces 15 and 16 but also the magnetic attraction action via the yoke 19 can be obtained, so that the magnetic force can be effectively used.

  In the figure, reference numerals 21 and 22 denote coupling means for the clasp 12 and the body member 11 according to the present invention, which are illustrated as ring-shaped members. However, the present invention is not limited to this, and all known methods such as a method of connecting at the shaft head 24 of the coupling shaft 23 as shown in FIG.

  In order to magnetically attract and connect the magnetic clasp 12 of the present invention having such a configuration by the magnetic pieces 13, 14, the other magnetic piece 13 is placed in the yoke 19 attached to the one magnetic piece 14 side. And the magnetic pieces 13 and 14 may be brought into contact with each other (FIG. 1). From this state, the connection cases 15 and 16 can be separated by pulling them left and right.

The center sectional view showing one example of the magnetic clasp in the jewelry concerning the present invention. The center sectional view which shows the separation state of a clasp same as the above. The perspective view which shows the example which applied this invention to jewelry. The center sectional view which shows the combined state and isolation | separation state of the conventional magnetic clasp.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Jewelery 11 Jewelery member 12 Magnetic clasp 13, 14 Magnetic piece 15, 16 Connection case 17, 18 Caulking 19 York

Claims (2)

A pair of magnets constituting a magnetic pair in an opening serving as a separation end of a pair of separable connection cases, which are magnetic clasps using magnetic pairs that can be magnetically attracted to each other and used for connecting members in jewelry. Each piece is attached, and a pair of connection cases can be connected by the magnetic force of the magnetic pair at the opening side, and a yoke that can be separated only when the pair of connection cases are pulled apart left and right is provided outside the connection case Magnetic clasps in jewelry that feature a clearance fit between the connection case and the yoke so that an external force in the tilting direction does not act on the magnetically attracted magnetic pair. . 2. The magnetic clasp according to claim 1 , wherein a magnetic circuit that passes through the yoke is formed together with the magnetic piece by forming the yoke using a ferromagnetic material .

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