Clasp for chain-type jewelry such as necklaces

Abstract

The fasteners for chain-type accessories can be easily removed when needed, and the magnetic force is not transmitted to the surrounding area on the magnetic surface where it is not originally needed. This prevents magnetic clasps from attracting each other when multiple chain-type accessories are displayed side by side on display shelves, etc., and also prevents magnetic clasps from attracting to bag fittings when a hand is placed in a bag. [Solution] A fastener for a chain-like accessory is provided with a pair of magnets 2 at the fasteners at both ends of the chain 3 of the chain-like accessory, and the surfaces other than the joining surface 2a of the magnets are surrounded by a magnetic shielding material 4. The magnetic shielding material is made of iron, permalloy, sendust, or silicon copper, and a gap 5 is interposed between the magnet and the magnetic shielding material.

Description

Technical Field

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

Background Art

[0002] Conventionally, chain-like ornaments such as necklaces, pendants worn around the neck, bracelets worn around the wrist, and anklets worn around the ankle have been widely popular. These chain-like 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-like 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 biased by a spring inside the pipe from the cut-out end of the pipe to the other end and is biased 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-described conventional fastener for chain-like 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-like ornament has 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, in this type of magnetic fastener, while it is acceptable for the contact surfaces of a pair of magnets to attract and make contact due to their mutual magnetic force, the surfaces other than these contact surfaces are also magnetic. As a result, the magnetic force of the magnets can propagate to surrounding magnetic materials, causing adverse effects on other surfaces of the magnets that do not inherently require magnetic influence, or due to the influence of the magnets themselves. As a result, when displaying chain-like jewelry on display shelves, the magnetic clasps of chain-like jewelry can attract each other when multiple pieces are displayed side-by-side. In particular, with bracelets, accidents have occurred where the magnets have attracted to the metal fittings of bags when women reach into their bags, causing the bracelets to fall off.

[0006] This invention aims to provide a fastener for chain-type accessories that prevents magnetic force from propagating to the surrounding area on the magnetic surface where magnetic force is not originally required, so that when multiple chain-type accessories are displayed side by side on a display shelf or the like, the fastener does not cause magnetic attraction problems with other chain-type accessories placed nearby, and does not cause magnetic attraction problems with bag fittings or other objects when a hand is placed in a bag. [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, characterized in that a pair of magnets are provided at the fasteners at both ends of the chain of the chain-like accessory, and the surfaces other than the joining surfaces of the magnets are surrounded by a magnetic shielding material.

[0008] Furthermore, the invention described in claim 2 is a clasp for a chain-shaped accessory such as a necklace, as described in claim 1, characterized in that the material of the magnetic shielding body is one of iron, permalloy, sendust, or silicon copper.

[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 a gap is interposed between the magnet and the magnetic shielding material. [Effects of the Invention]

[0010] The fasteners for chain-type accessories such as necklaces according to claims 1 to 3 above require a certain amount of pulling force to resist the magnetic force of the magnets in the direction of pulling the pair of magnets apart, so they cannot be pulled apart with careless force, thus preventing accidents in which the fastener falls off unintentionally. Furthermore, because the surfaces other than the contact surface of the magnets are surrounded by a magnetic shielding material, when displaying multiple chain-type accessories side by side on display shelves, the magnetic fasteners of nearby chain-type accessories will not attract each other, and the magnetic fasteners will not attract to the metal fittings of bags when you put your hand in a bag, etc.

[0011] Furthermore, claim 2 has the effect of reliably preventing adhesion problems such as the magnetic fastener attracting to the fasteners of other products or to bag hardware, by using iron, permalloy, Sendust, or silicon copper as the material of the magnetic shield.

[0012] Furthermore, claim 3 has the effect of more reliably preventing adhesion problems such as the magnetic fastener attracting to the fastener of another product or to the metal fittings of a bag, because a gap is interposed between the magnet and the magnetic shield. [Brief explanation of the drawing]

[0013] [Figure 1] This is a front 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] These are cross-sectional views along line AA in Figures 1 and 2. [Modes for carrying out the invention]

[0014] Based on the attached drawings below, one embodiment of the fastener for chain-shaped ornaments such as the necklace of the present invention will be described in detail, but the present invention is not limited to these embodiments. The magnets 1 and 2 shown in FIG. 1 are attached to both ends of the chain 3.

[0015] These magnets 1 and 2 are surrounded by a magnetic shield 4 on the surfaces other than the joint surfaces 1a and 2a. As the material of the magnetic shield 4, iron, permalloy, sendust, and silicon copper are suitable, but other materials may also be used.

[0016] The surfaces of the magnets surrounded by the magnetic shield 4 are prevented from propagating magnetic force outward from that position. Since the magnetic forces of the magnets 1 and 2 are not propagated outside the magnetic shield 4 in this way, it is possible to prevent the magnetic fastener of the chain-shaped ornament from causing adsorption troubles with the fasteners of other products, so there is no risk of hindering the display of products on display shelves, etc., and a very easy-to-handle sense of security is generated for those who perform the display work. In addition, since the adsorption trouble such that the magnetic fastener adsorbs to a bag fitting or the like is prevented, unexpected accidents such as the bracelet falling off contrary to intention can be prevented. Therefore, when disconnecting the connection at both ends of the chain 3 of the chain-shaped ornament worn on the body, it can be easily separated without any discomfort, and the chain-shaped ornament can be easily removed from the wearing position on the neck, wrist, or ankle.

[0017] Furthermore, if a gap 5 is formed between the magnets 1 and 2 and the magnetic shield 4, the propagation of magnetic force can be more reliably prevented. The interval of this gap is about 1 to 4 mm, which can prevent the propagation of magnetic force without adversely affecting the dimensions and design of the chain-shaped ornament, and can surely exhibit the effect of magnetic shielding. Note that reference numeral 6 is a decorative cover that conceals the fastener. Regarding the thickness dimension of the anti-magnet 4, according to the experiments of the inventor, if it is less than 2 mm, it may have an adverse effect on preventing the propagation of magnetic force. On the other hand, if it exceeds 5 mm, it will be an unnecessary dimension. Therefore, the range of 2 - 5 mm can prevent reliable adsorption troubles without wasting resources.

Industrial Applicability

[0018] The fastener of the chain-shaped jewelry such as the necklace of the present invention can be used at the site of manufacturing and selling chain-shaped jewelry, and further at the site of using chain-shaped jewelry, and its scope of use is very wide.

Explanation of Signs

[0019] 1 … Magnet 2 … Magnet 1a … Joint surface of the magnet 2a … Joint surface of the magnet 3 … Chain 4 … Anti-magnet 5 … Gap between the anti-magnet and the magnet 6 … Decorative cover

Claims

1. A fastener for a chain-like ornament, characterized in that a pair of magnets are provided at the fasteners at both ends of the chain, and the surfaces other than the contact surface of the magnets are enclosed with a magnetic shielding material.

2. The fastener for a chain-shaped accessory such as a necklace, as described in claim 1, is characterized in that it uses iron, permalloy, sendust, or silicon copper as the material for the magnetic shielding.

3. The fastener for a chain-like accessory such as a necklace according to claim 1, characterized in that a gap is interposed between the magnet and the magnetic shielding material.

Images