Clasp for chain-type jewelry such as necklaces

Abstract

The present invention provides a fastener for a chain-type accessory that can be easily removed when necessary, while preventing the fastener from coming loose unintentionally even if a small horizontal load is applied. [Solution] A fastener for a chain-like accessory, such as a necklace, equipped with magnets 1 and 2 at both ends of a chain 3, characterized in that a convex portion 4 is formed on one of the contact surfaces of the magnets and a concave portion 5 is formed on the other contact surface of the magnet, wherein the convex portion and concave portion are located in the center of the respective contact surfaces of the magnets, and there are multiple convex portions and concave portions on each of the contact surfaces of the magnets.

Description

Technical Field

[0001] The present invention relates to a fastener for chain-shaped ornaments such as necklaces.

Background Art

[0002] Conventionally, chain-shaped ornaments such as necklaces, pendants, bracelets for wrists, and anklets for ankles have been widely popular. These chain-shaped ornaments are generally formed of a chain-shaped chain, but there are also those that substitute a chain with a string made of metal or fiber.

[0003] As a fastener for chain-shaped ornaments such as necklaces, a bolt ring is generally used. This bolt ring is composed of a ring-shaped pipe with a part cut out and an arc-shaped tongue that can move inside the pipe. The tongue is urged by a spring inside the pipe to protrude from the cut-out end of the pipe to the other end in the direction of forming a ring. However, the operation of attaching or detaching at a place that cannot be seen, such as behind the neck, while pushing in the knob of the arc-shaped tongue is very troublesome.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] In the above-mentioned conventional fastener for chain-shaped ornaments, there is a drawback that the operation is difficult. Therefore, in order to enable easy attachment and detachment operations, a fastener provided with magnets at both ends of the chain-shaped ornament has also been proposed. This magnetic fastener was attached by bringing the magnets close together from both sides, and to remove it, force was applied to both sides and pulled to detach it. However, with this magnetic fastener, the contact surfaces when fastening by bringing them together from the left and right are flat contact surfaces. Therefore, while a certain amount of force is required to remove it by pulling it from the left and right, making accidental separation unlikely, it has the drawback that if the contact points are slid horizontally, it can easily come off even with a small amount of force. As a result, a problem arose where necklaces and bracelets would fall off without the wearer noticing, even from a slight impact such as their arm getting caught on something.

[0006] This invention aims to provide a fastener for chain-type jewelry that can be easily removed when necessary, while preventing the fastener from coming loose unintentionally even if a small horizontal load is applied. [Means for solving the problem]

[0007] To solve the aforementioned problems, the invention described in claim 1 is a fastener for a chain-like accessory, such as a necklace, which has magnets at both ends of the chain, characterized in that a convex portion is formed on one of the contact surfaces of the magnets and a concave portion is formed on the contact surface of the other magnet.

[0008] Furthermore, the invention described in claim 2 is a fastener for a chain-like accessory such as a necklace, as described in claim 1, characterized in that the convex portion and the concave portion are located in the center of the respective contact surfaces of the magnet.

[0009] Furthermore, the invention described in claim 3 is a fastener for a chain-like accessory such as a necklace, as described in claim 1, characterized in that there are multiple convex and concave portions on each of the contact surfaces of the magnet. [Effects of the Invention]

[0010] The clasps for chain-like accessories such as necklaces according to claims 1 to 3 above require a certain amount of pulling force against the magnetic force of the magnets to separate the pair of magnets, so they cannot be separated by accidental force, thus preventing accidents in which the clasp falls unintentionally. Furthermore, the movement of sliding the contact surface of the magnets horizontally is completely prevented by the fitting of the recess and protrusion provided on the magnets, so the clasp will not come off even if the arm is accidentally brought into contact with a wall or obstacle, allowing for stable use of the clasp.

[0011] Furthermore, claim 2 has the effect of providing excellent stability when the magnets are joined, and when they are removed, a pulling force can be applied stably, as the convex and concave portions are located in the center of the contact surfaces of the magnets, thus enabling stable removal and attachment of the fastener.

[0012] Furthermore, claim 3 has the excellent feature that the above-mentioned effects can be further improved because there are multiple convex and concave portions on each of the contact surfaces of the magnet. [Brief explanation of the drawing]

[0013] [Figure 1] This is a plan view of the fastener according to the present invention when it is being removed. [Figure 2] This is a front view of the installation. [Figure 3] This is a perspective view of a magnet with a convex portion. [Figure 4] This is a perspective view of a magnet with the same recess. [Modes for carrying out the invention]

[0014] The following describes in detail one embodiment of the clasp for chain-type jewelry such as necklaces according to the present invention, based on the attached drawings, but the present invention is not limited to these embodiments. The magnets 1 and 2 shown in Figure 1 are attached to both ends of the chain 3. A convex portion 4 is provided on the joining surface of magnet 1, and a concave portion 5 is provided on the joining surface of magnet 2.

[0015] This convex portion 4 may be formed of the same material as the magnet or of another material. On the other hand, one concave portion 5 is formed so as to penetrate the joint surface of the magnet 2. Since the depth of the concave portion 5 is formed to a dimension that the tip of the convex portion cannot reach, when the magnets 1 and 2 are joined, a state where the joint surfaces face each other without a gap is ensured.

[0016] Next, when pulling out the convex portion 4 of the fastener from the concave portion 5, when pulling with a certain amount of force in the direction in which the joint surface of the fastener separates, the convex portion 4 is surely released from the state of being inserted into the concave portion 5, and as a result, the magnets 1 and 2 separate from each other. Therefore, both ends of the chain 3 of the chain-shaped ornament are disconnected, and the chain-shaped ornament can be easily removed from the wearing position on the neck, wrist, or ankle.

[0017] As described above, the magnets 1 and 2 of the fastener can be easily removed if necessary, and can also be easily attached, and an unintentional removal state can be surely prevented.

Industrial Applicability

[0018] The fastener of the chain-shaped ornament such as a necklace according to the present invention can be used at the site of manufacturing the chain-shaped ornament and further at the site of using the chain-shaped ornament, and its range of use is very wide.

Explanation of Signs

[0019] 1... Magnet 2... Magnet 3... Chain 4... Convex portion 5... Concave portion

Claims

1. A clasp for a chain-like accessory, such as a necklace, comprising magnets at both ends of the chain, characterized in that a convex portion is formed on one of the contact surfaces of the magnets and a concave portion is formed on the contact surface of the other magnet.

2. The fastener for a chain-like accessory such as a necklace, as described in claim 1, characterized in that the convex portion and the concave portion are located at the center of the respective contact surfaces of the magnet.

3. The fastener for a chain-like accessory such as a necklace according to claim 1, characterized in that there are multiple convex and concave portions on each of the contact surfaces of the magnet.

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