JP2022125605A - Core wire for accessory - Google Patents

Abstract

To provide a core wire for an accessory used for a bracelet or a necklace, in which butted parts on both sides of a coil body formed in a ring shape are difficult to be broken.SOLUTION: A core wire for an accessory includes a connection part formed by engaging, entangling and thereby connecting together a coil part on one side and a coil part on the other side of a coil body 2 formed by winding spirally a thin metallic wire 1, a middle core 14 inserted to the inside of the connection part, and a caulking piece 12 to be caulked in the state where the connection part is covered.SELECTED DRAWING: Figure 7

Description

TECHNICAL FIELD The present invention relates to a core wire for accessories, and more particularly, to a core wire for accessories having a structure in which abutted portions formed by abutting both ends of a coil body formed by spirally winding a wire having a small diameter are not easily broken. .

Ring-shaped bangles (bracelets) and necklaces, in which beads are threaded through a rubber core, can be easily worn around the wrist or neck without clasps. However, rubber ages and degrades after 3-4 years. When the core wire breaks due to deterioration, the decorative beads fall apart and fall off. It is desirable to form the core wire with a coil body made of metal instead of rubber to provide durability and stretchability.

As shown in Patent Literature 1, the coil body made of metal is formed into a ring shape by welding both ends of the coil body. A core wire of an accessory lacks softness if the wire rod of the coil body is thick, so a wire rod with a thin wire diameter is desired. In that case, since the area of the end surface of the welded portion is small, the joint strength cannot be maintained, and the joint may break due to expansion and contraction.

In Patent Document 2, a wire is inserted into a coil body, a crimping piece is attached to the end of one wire, one fastener is attached, and the other fastener is similarly attached to the other wire end. , the structure is shown to allow both ends to be attached and detached. Although the ends of the coiled body can be fixedly connected, preforming the coiled body into a ring is not shown.

JP-A-52-56253 JP-A-2005-224413

SUMMARY OF THE INVENTION It is an object of the present invention to provide a core wire for accessories, which is used for bracelets and necklaces and in which the butted portions of both ends of a ring-shaped coil body are not easily broken.

A core wire for an accessory according to the present invention (Example 1) is formed by meshing and entwining a coil portion on one end side and a coil portion on the other end side of a coil body formed by spirally winding a thin metal wire. It is characterized by comprising a connecting portion, a core inserted into the connecting portion, and a crimping piece that is crimped while covering the connecting portion.

A core wire for an accessory according to the present invention (Example 2) is formed by meshing and entwining a coil portion on one end side and a coil portion on the other end side of a coil body formed by spirally winding a thin metal wire. It is characterized by comprising a connecting portion, a core inserted into the connecting portion, and a spot-welded portion obtained by laser-welding a plurality of locations of a wire joining portion of the connecting portion.

The caulking is characterized in that depressions are formed in a plurality of locations in the length direction of the caulking piece toward the direction of the wire rod.

The wire is made of a nickel-titanium alloy with a wire diameter (d) of 0.13 to 0.4 mm, and the coil body has an outer diameter (Do) of 3 to 5 times the wire diameter. It is characterized by being spirally wound.

The crimping piece is characterized in that it is a cylindrical body made of metal that can be pressurized and deformed.

The crimping piece is made of metal selected from stainless steel, aluminum, aluminum alloy, magnesium, magnesium alloy, brass, copper, and copper alloy.

According to the core wire for an accessory (Embodiment 1) according to the present invention, the coil portion on one end side of the coil body and the coil portion on the other end side of the coil body are engaged and entwined, and the joint portion is inserted into the joint portion. Since the center core and the crimping piece which is crimped while covering the connecting portion are provided, both ends of the coil body can be firmly connected and are less likely to be broken. Since it is formed into a ring-shaped coil body, there is no fastener, and the coil body can be expanded and contracted, so it is convenient for bracelets and the like.

According to another core wire for accessories according to the present invention (embodiment 2), the coupling portion coupled by engaging and entangling the coil portion on one end side of the coil body and the coil portion on the other end side of the coil body, and the inside of the coupling portion and a spot welded portion laser-welded to a plurality of locations of the wire rod joining portion of the connecting portion. Since it is formed into a ring-shaped coil body, there is no fastener, and the coil body can be expanded and contracted, so it is convenient for bracelets and the like.

Since the caulking piece has a plurality of recesses extending in the direction of the wire rod, the caulking piece can firmly fix the joint so as not to come loose.

The wire is made of a nickel-titanium alloy with a wire diameter (d) of 0.13 to 0.4 mm, and the coil body is spirally formed so that the outer diameter (Do) of the coil body is 3 to 5 times the wire diameter. Since it is wound
(a) The nickel-titanium alloy has rubber-like elasticity (superelasticity), and can return to its original shape even when a large force is applied compared to a stainless steel coil.
(b) A wire rod having a wire diameter of 0.13 to 0.4 mm is used, and the outer diameter of the coil body is formed to be 3 to 5 times the wire diameter.
(c) If the diameter of the wire is 0.2 mm, and the outer diameter of the coil body is 0.8 mm, which is four times the diameter of the wire, even if the outer diameter of the decorative bead is a small sphere of about 3 to 4 mm, , through-holes can be drilled.

Since the crimping piece is a cylindrical body made of metal that can be pressurized and deformed, it can be positioned at the connecting portion by inserting it from the end of the coil body in advance.

Since the crimping piece is made of a metal selected from stainless steel, aluminum, aluminum alloy, brass, copper, and copper alloy, it can be pressurized to easily form the recess.

1 is an external view of a core wire for an accessory according to the present invention; FIG. 1 is an external view of a bracelet in which a decorative bead is inserted through a core wire for an accessory according to the present invention; FIG. (A) shows a normal state in cross section, and (B) shows a state in which the core wire for accessories is stretched for wearing. It is the figure which crimped the joint part of the both ends of the coil body with the crimping piece. (Example 1) FIG. 4 is a cross-sectional view when both ends of the coil body are butted and joined. FIG. 4 is a cross-sectional view showing that both ends of the coil body are meshed with each other; FIG. 4 is a cross-sectional view when the crimping piece is positioned outside the coupling portion; FIG. 5 is a cross-sectional view showing crimping of the crimping piece from the outside; FIG. 4 is a cross-sectional view showing that the caulking piece is dented to increase its strength; It is a perspective view of a core. It is a perspective view of a crimping piece. It is explanatory drawing in the case of joining a butt part by laser welding. (Example 2) FIG. 3 is a diagram showing the relationship between the wire diameter (d) and the outer diameter (Do) of the coil body. It is a figure which shows the relationship between an arm and a coil body. (A) is a diagram showing a cross section of an arm and a coil body, and (B) is a diagram showing a case where the coil body is pulled and expanded in diameter.

Hereinafter, the core wire for accessories according to the present invention will be described with reference to the drawings.

FIG. 1 is an external view of a core wire 100 for an accessory according to the present invention. The core wire 100 for accessories consists of the coil body 2 which wound the wire 1 spirally. Both ends of the coil body 2 are connected and fixed, and the coil body 2 is formed in a ring shape. Although the decorative beads are not shown in FIG. 1, after the decorative beads are inserted into the coil body 2, they are formed into a ring shape. Since the coil body 2 is a coil body obtained by spirally winding the metal wire 1, it can be freely stretched and bent.

The wire rod 1 has a wire diameter (d) of 0.13 to 0.4 mm and is made of a nickel-titanium alloy. The wire diameter (d) is one size smaller than the conventional one. The coil body 2 is formed by spirally winding so that the outer diameter (Do) of the coil body is 3 to 5 times the wire diameter (d). For example, the outer diameter (Do) of the coil body is 0.6 to 1.0 mm for a wire diameter (d) of 0.2 mm, and the outer diameter of the coil body is small and thin. Nickel-titanium alloys have shape-memory characteristics that restore their original shape when heat-treated, and super-elastic characteristics that restore rubber-like properties. Since it is stretched and attached to the wrist every time it is worn, it is convenient to have a restoring force. Since it is made of metal, deterioration of the core wire can be suppressed compared to rubber or the like. When the accessory core wire 100 is used as a bracelet, the nickel-titanium alloy is also excellent in corrosion resistance, so it is less susceptible to sweat.

FIG. 2 is an external view of a bracelet 200 in which a decorative bead 3 is inserted through a core wire 100 for an accessory according to the present invention. FIG. 2(A) shows a normal state in cross section, and FIG. 2(B) shows a stretched state for wearing on the arm. The diameter L1 of the bracelet is approximately 7 cm. In (B), the diameter L2 of the bracelet is doubled to about 15 cm so that the hand can be passed through. Although the decorative beads 3 are densely arranged, they may be arranged at intervals. As for the decorative beads 3, large ones and small ones may be arranged alternately. If the bracelet is to be wrapped around the wrist twice, the diameter L1 of the bracelet should be doubled to about 14 cm. For example, since the outer diameter (Do) of the coil body can be made as thin as 0.6 to 1.0 mm, the diameter of the insertion hole of the decorative bead 3 can be reduced, and a crystal ball or small bead having an outer diameter of about 3 to 5 mm can be used. be able to. A necklace can be made by further lengthening L1 to about 20 to 30 cm. In this case, the necklace does not require a clasp and is stretched and worn over the wearer's head and around the neck. Since the accessory core wire 100 does not have a fastener, it is not troublesome to connect the fastener when worn.

FIG. 3 is a view of the joint portions 8 at both ends of the coil body 2 crimped by crimping pieces 12. As shown in FIG. The portion of the coil body 2 where the crimping piece 12 is located is only slightly thickened in outer diameter. In order to freely move the decorative bead 3, it is necessary to make the through hole considering this outer diameter.

FIG. 4 is a cross-sectional view when both ends of the coil body 2 are butted and joined. One end of the coil body 2 is shown in white and the other end in gray. A core 14 is inserted into the coupling portion 8 of the coil body 2 . The crimping piece 12 is attached to the coil body 2 in advance.

FIG. 5 is a cross-sectional view showing that both ends of the coil body 2 are meshed with each other. Both ends of the coil body 2 are slid from both sides so that the center core 14 is positioned at the center of the connecting portion 8, and both ends of the coil body 2 are engaged with each other. Since both ends of the coil body 2 are entwined by meshing, they can be firmly connected. From this state, the crimping piece 12 inserted into the coil body 2 is moved to the connecting portion 8 .

FIG. 6 is a cross-sectional view when the crimping piece 12 is positioned outside the connecting portion 8. As shown in FIG. The crimping piece 12 is arranged in the center of the joint 8 . In this state, the crimping piece 12 is crimped from the outside.

FIG. 7 is a cross-sectional view showing crimping of the crimping piece 12 from the outside. A core 14 is inserted into the connecting portion 8 of the coil body 2 and crimped with a crimping piece 12 from the outside. By crimping, a strong bond can be obtained. In the example of FIG. 7, the wire rod 1 has a diameter of 0.2 mm. An outer diameter Do of the coil body 2 is 0.8 mm.

FIG. 8 is a cross-sectional view showing that the caulking piece 12 is provided with a recess 11 to increase strength. As shown in the dashed circle, the crimping piece 12 is pressurized to form a depression 11, thereby increasing the strength of the bond. A crimping piece 12 made of metal can be used.

FIG. 9 is a perspective view of the core 14. FIG. The core 14 in FIG. 8 has a diameter of 0.35 mm and a length of about 4 mm. Here, since the coil body 2 has an outer diameter of 0.8 mm and an inner diameter of 0.4 mm, the core 14 can be inserted without resistance. The outer diameter of the core 14 is not limited to this, and plural sizes are prepared according to the inner diameter of the coil body 2 .

10 is a perspective view of the crimping piece 12. FIG. The crimping piece 12 of this embodiment is a cylindrical body made of metal. Specifically, stainless steel, aluminum (pure aluminum), aluminum alloys (aluminum and copper, aluminum and magnesium alloys, aluminum and manganese alloys, etc.), brass (copper and zinc alloys), copper, copper alloys (copper and alloy of tin). For example, if the outer diameter Do of the coil body 2 is 0.8 mm, the coil body 2 can be passed through the hole of the crimping piece 12 like a thread because it is less than 1 mm.

11A and 11B are explanatory diagrams of a case where the connecting portion 8 is joined by laser welding. Since the joining force is not sufficient only by butting and welding the both ends of the coil body 2, the both ends of the coil body 2 are meshed and entwined as shown in FIG. 11(a). Sufficient strength can be obtained by meshing. If the meshed portions are laterally displaced, both ends are separated from each other, so in order to prevent lateral dislocation, a center core 14 is inserted and a spot welded portion 6 is formed by laser welding. As shown in FIG. 11(b), spot welds 6 are formed at three locations near the center of the joint 8 at intervals of about 120°. The wire rods are welded at three locations of the wire butt portions 9 where the wires are adjacent to each other.

FIG. 12 is a diagram showing the relationship between the diameter (d) of the wire 1 and the outer diameter (Do) of the coil body 2. As shown in FIG. The coil body 2 of the core wire 100 for accessories is formed by spirally winding the wire 1 . Here, the wire diameter d of the wire rod 1 was set to 0.2 mm. The outer diameter Do of the coil body is such that Do/d is 3, 4, and 5, respectively. In this case, the combinations of (d, Do) are (0.2 mm, 0.6 mm), (0.2 mm, 0.8 mm), (0.2 mm, 1.0 mm). The wire rod 1 is preferred because it is thin and can be deformed with a small force. Even if the wire diameter of the wire is slightly different, the weight does not change so much. It is easy to use because it can be extended smoothly with a small force.

Not limited to this, the wire diameter d of the wire rod 1 can also be 0.3 mm or 0.4 mm. Then the combination of (d, Do) is (0.3 mm, 0.9 mm), (0.3 mm, 1.2 mm), (0.3 mm, 1.5 mm), (0.4 mm, 1.2 mm ), (0.4 mm, 1.6 mm), (0.4 mm, 2.0 mm). The wire rod 1 may be selected from among these according to the purpose of use and the size of the decorative beads. As the wire diameter of the wire rod 1 increases, it generally becomes difficult to bend the wire rod 1 to a small value such that Do/d is 3 or 4. Further, if the average diameter of the coil body 2 is Dm, there is a relationship of Do=Dm+d, and if the coil inner diameter is Di, there is a relationship of Di=Dm−d.

FIG. 13 is a diagram showing the relationship between the wearer's arm 15 and the coil body 2. As shown in FIG. (A) is a diagram showing a cross section of the arm 15 and the coil body 2, and (B) is a diagram showing a case where the coil body 2 is pulled and expanded in diameter. As shown in FIG. 13A, for example, it is assumed that the coil body 2 having a natural length of 190 mm is attached to the arm 15 having an outer circumference of 173 mm with a slight margin. The length of the minor axis is about 45 mm. As shown in FIG. 13(B), the diameter of the coil body 2 is expanded by pulling the coil body 2 with fingers when worn on the arm. When the length of the minor axis is pulled downward to a length of 90 mm, the case of pulling to 100 mm, the case of pulling to 110 mm, and the case of pulling to 120 mm are shown. The coil body 2 has a wire diameter d of 0.2 mm and an outer diameter Do of 0.78 mm. In the experiment, none of the wearers pulled the minor axis downward by 120 mm or more. The tensile load at this time was approximately 340 g.

The core wire for accessories of the present invention is ring-shaped, has no fasteners, is thin and supple, can be stretched flexibly, is less likely to break at the butted portion, and is suitable as a core wire for accessories that can be easily worn on the hand or arm.

REFERENCE SIGNS LIST 1 wire rod 2 coil body 2a coil portion on one end side 2b coil portion on the other end side 3 decorative bead 6 spot welding portion 8 connecting portion 9 wire rod butting portion 11 recess portion 12 caulking piece 14 center core 15 arm 100 core wire for accessories 200 Bracelet d Wire diameter Do Outer diameter of coil body

A core wire for an accessory according to the present invention (Example 1) is formed by meshing and entwining a coil portion on one end side and a coil portion on the other end side of a coil body formed by spirally winding a thin metal wire. A connecting part, a core inserted into the connecting part, and a crimping piece that is crimped while covering the connecting part , wherein the crimping piece is made of a metal that can be deformed under pressure. It is a cylindrical body, and at a plurality of locations in the length direction, depressions are formed on the outside toward the direction of the wire, and protrusions are formed on the inside, and the wire has a wire diameter (d) of 0.13. It is characterized in that it is made of a nickel-titanium alloy with a thickness of up to 0.2 mm, and the coil body is spirally wound so that the outer diameter (Do) of the coil body is 3 to 4 times the wire diameter. do.

A core wire for an accessory according to the present invention (Example 2) is formed by meshing and entwining a coil portion on one end side and a coil portion on the other end side of a coil body formed by spirally winding a thin metal wire. a joint portion, a core inserted into the joint portion, and three spot welded portions laser-welded at intervals near the center of a wire joining portion of the joint portion; is made of a nickel-titanium alloy with a wire diameter (d) of 0.13 to 0.2 mm, and the coil body is spiraled so that the outer diameter (Do) of the coil body is 3 to 4 times the wire diameter It is characterized by being wound in a shape .

Claims (6)

a coupling portion coupled by meshing and entangling a coil portion on one end side and a coil portion on the other end side of a coil body formed by spirally winding a thin metal wire;
a core inserted inside the joint;
and a crimping piece that is crimped while covering the connecting portion. a coupling portion coupled by meshing and entangling a coil portion on one end side and a coil portion on the other end side of a coil body formed by spirally winding a thin metal wire;
a core inserted inside the joint;
and a spot-welded portion obtained by laser-welding a plurality of locations of the wire joining portion of the connecting portion. 2. The core wire for an accessory according to claim 1, wherein the caulking is formed at a plurality of locations in the length direction of the caulking piece with depressions directed toward the wire rod. The wire is made of a nickel-titanium alloy with a wire diameter (d) of 0.13 to 0.4 mm, and the coil body has an outer diameter (Do) of 3 to 5 times the wire diameter. 3. The core wire for accessories according to claim 1, wherein the core wire is spirally wound. The core wire for an accessory according to claim 1 or 3, wherein the crimping piece is a cylindrical body made of metal that can be deformed under pressure. 6. The core wire for an accessory according to claim 5, wherein said crimping piece is made of a metal selected from stainless steel, aluminum, aluminum alloy, magnesium, magnesium alloy, brass, copper and copper alloy.

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