JP2010005259A - Fastener for personal ornaments - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a fastener for personal ornaments which facilitates the insertion and extraction of a male member into and from a female member, unerringly holds the members in a connected condition, hardly undergoes a secular change, and has sufficient durability. <P>SOLUTION: The fastener for personal ornaments has a columnar male metallic part 10 and a cylindrical female metallic part 20 into which the female metallic part is fitted. The male metallic part 10 has a cylindrical through-hole 13 intersecting a fitting direction at right angles and a slit 14 leading to the cylindrical through-hole 13 from the chip face. The female metallic part is provided with a lever 40 which rotatably supports a rod 30 capable of being rotatably fitted into the cylindrical through-hole 13 and forming its part engaging with the cylindrical through-hole 13 into a flat chamfered portion 31 having a thickness which enables passage through the slit 14 and is fastened to one end or both ends of the rod 30 outside the female metal part 20. When the lever 40 is rotated in one direction, the chamfered portion 31 of the rod 30 gets parallel with the slit 14. When the lever is rotated in the opposite direction, the chamfered portion 31 inclines to or intersects the slit 14 at right angles. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  This invention is a bracelet accessory that is formed by connecting a number of jewels such as pearls, jade and jewels and connecting them, or a chain accessory such as gold, silver or platinum, such as a necklace or a bracelet. The present invention relates to a fastener for jewelry that connects both ends thereof to make it endless.

In general, bracelet or chain accessories such as necklaces and bracelets are attached endlessly to the neck or arm, but they must be connected or separated at each end of the attachment. Various fasteners or couplings are used to make it easy and reliable.
Most of them are of the pin insertion / removal type, which is a combination of a female member having an insertion hole and a male member having a protrusion that can be inserted into and removed from the insertion hole. This type has the advantage that the operation for connection is easy and the overall size can be made relatively small even in the connected state.

Therefore, the present inventor has previously proposed a connector described in Patent Document 1. The connector includes a female (female) type member provided with an insertion hole and a male (male) type member provided with a projection that can be inserted into and removed from the insertion hole.
The female member includes a pair of retaining locking pieces biased in a direction approaching each other at positions symmetrical to the central axis of the insertion hole, and the pair of retaining locking pieces around the central axis. And a pair of insertion blocking pieces biased in a direction approaching each other at positions orthogonal to each other.

  On the other hand, the protruding portion of the male member has at least a predetermined length portion on the distal end side tapered in the distal direction, and is inserted around the insertion axis of the female member around the central axis in the insertion direction. A pair of retainer locking portions by steps or depressions that can be rotated and can be engaged with each retaining latch piece of the female member at positions symmetrical to the central axis on the outer peripheral surface, and around the central axis And a pair of contact portions formed by steps on which the respective insertion-preventing pieces of the female-type member can come into contact with each other, and the above-mentioned pair of retaining portions on the outer peripheral surface. A portion excluding the locking portion and the pair of contact portions is formed on a smooth surface.

  Thereby, the male member and the female member are securely connected by inserting the protruding portion of the male member into the insertion hole portion of the female member and engaging the retaining latching portion with the retaining latching piece. Can be linked. At that time, if the projection is inserted into the insertion hole around the central axis in the insertion direction so that the angular positions of the retaining latch and the retaining latch are aligned, the retaining latch and retaining Although it can be connected so that it can not be pulled by engaging the locking piece, even if it is inserted into the insertion hole with the angular position of the locking stopper and the locking stopper shifted 90 degrees, The abutting part abuts against the insertion preventing piece and cannot be completely inserted and cannot be connected.

Therefore, when the male member is inserted into the female member, the connecting operation by insertion is possible only when the male member is at a predetermined relative angular position where the male member can be connected. There is almost no fear of it.
JP 2005-32907 A

However, in this connector, since the retaining latch piece and the insertion preventing piece by the leaf spring are provided in the female member, if the biasing force is too strong, the male member and the female member are inserted and removed. If operation becomes difficult and the urging force is too weak, the connection holding force between the male member and the female member is reduced, and there is a possibility that even a small force may come off, so adjustment of the urging force is difficult. There was a problem.
In addition, since extremely small leaf springs are used, there are problems with aging and member durability.

  The present invention has been made to solve such a problem. The male member and the female member can be easily inserted into and removed from each other, can be securely held in a connected state, and hardly change over time. The object is to provide a fastener for jewelry that is sufficiently durable.

  In order to achieve the above object, a fastener for jewelry according to the present invention includes a male metal fitting made of a columnar block and a cylindrical female metal fitting into which the male metal fitting is fitted, and the male metal fitting includes a female fitting. A cylindrical through hole whose axis is perpendicular to the fitting direction to the mold fitting, and a slit having a width smaller than the diameter of the cylindrical through hole from the tip end surface in the fitting direction to the female fitting to the cylindrical through hole And form.

A cylindrical rod that is rotatably fitted in the cylindrical through-hole, and a portion that fits into the cylindrical through-hole is chamfered into a flat plate having a thickness slightly smaller than the width of the slit. A rod having a take-up portion is rotatably supported on the female metal fitting, and a lever that is fixed to one end or both ends of the rod outside the female metal fitting is provided.
Then, when the lever is rotated in a direction in which the free end portion is separated from the female metal fitting, the chamfered portion of the rod is in a state parallel to the slit, and the free end portion of the lever is the female metal fitting. The chamfered portion of the rod is inclined or orthogonal to the slit when the rod is rotated in a direction approaching.

The female metal fitting has a rectangular tube shape, and the male metal fitting can be fitted into the rectangular tube-shaped female metal fitting, and a prismatic protrusion having a cylindrical through hole and a slit, and a rear end portion thereof. It is good to make it consist of the prismatic base part of the same thickness as the external dimension of the said female metal fitting provided in the.
In the vicinity of the free end of the female metal fitting and the lever, the lever is engaged with each other when the lever is rotated to its rotational end position in a direction in which the free end approaches the female metal fitting. It is desirable to provide means for locking the lever.

  The fastener for jewelry according to the present invention also includes a male fitting having a shape obtained by cutting a metal member having an outer peripheral surface in the shape of an ellipse rotated about a major axis into two parts by cutting in a direction perpendicular to the major axis. A female metal fitting, and a split surface of the male metal fitting is provided with a prismatic protrusion protruding along the major axis direction of the ellipse, and the prismatic protrusion of the female metal fitting is provided on the split surface of the female metal fitting. You may comprise and provide the square hole which inserts.

In this case, the protrusion has a cylindrical through hole whose axis is a direction orthogonal to the direction in which the female fitting is inserted into the square hole, and the cylindrical through hole from the front end surface in the direction of insertion into the square hole. A cylindrical rod that is formed into a slit having a width smaller than the diameter of the cylindrical through-hole and is rotatably fitted in the cylindrical through-hole, and the portion that fits into the cylindrical through-hole A rod having a chamfered portion formed by chamfering into a flat plate having a thickness slightly smaller than the width of the slit is rotatably supported by the female metal fitting, and the rod of the rod is provided outside the female metal fitting. A lever that is fixed to one end or both ends is provided.
When the lever is rotated in one direction, the chamfered portion of the rod is in parallel with the slit, and when the lever is rotated in the opposite direction, the chamfered portion of the rod is the slit. Inclined or perpendicular to the angle.

  In any of the above fasteners for jewelry, it is preferable that the male metal fitting, the female metal fitting, and the lever are all made of gold, platinum, silver, or an alloy containing any of them.

The fastener for jewelry according to the present invention has the above-described configuration, and in a bracelet or chain accessory such as a necklace or a bracelet, a male metal fitting is attached to one of both ends, and a female metal fitting is attached to the other. By fitting the male fitting into the female fitting and rotating the lever by a predetermined angle, the female fitting is prevented from coming off from the male fitting, so that both can be securely connected and an endless accessory can be formed. . After that, there is no fear of leaving carelessly.
If the lever is rotated by a predetermined angle in the reverse direction from the connected state, the male metal fitting can be easily pulled out from the female metal fitting, and both can be easily detached. Moreover, the structure is simple and the manufacture is easy. Moreover, since no spring is used, there is almost no secular change, and there is sufficient durability.

Preferred embodiments of the present invention will be specifically described below with reference to the drawings.
First, an outline of one embodiment of a fastener for jewelry according to the present invention will be described with reference to FIGS. FIG. 1 is a front view showing a process of fitting and connecting a male fitting of a fastener for a jewelry accessory to a female fitting, with only the female fitting made in a longitudinal section, and a lever shown in phantom lines, A state in which the male metal fitting is partially inserted into the female metal fitting, (b) is a state in which the male metal fitting is completely inserted into the female metal fitting, and (c) is a male metal fitting by rotating the lever. And the state where the female metal fittings are connected.
FIG. 2 is a front view showing a state where the male fitting and female fitting of the fastener for jewelry are separated, and FIG. 3 is a front view showing a state where the male fitting and the female fitting are connected.

The fastener for jewelry 1 includes a male metal fitting 10 made of a columnar block and a cylindrical female metal fitting 20 into which the male metal fitting 10 is fitted. In this embodiment, the female metal fitting 20 has a square cylindrical shape with one end opened and the other end closed, and the male metal fitting 10 has a rectangular columnar projection that can be inserted into the female metal fitting 20 from the opening. 11 and a prismatic base 12 having the same thickness as the external dimensions of the female metal fitting 10 provided integrally at the rear end thereof.
The protrusion 11 has a cylindrical through-hole 13 whose axis is perpendicular to the fitting direction into the female fitting, and a slit 14 leading from the distal end surface in the fitting direction to the female fitting 10 to the cylindrical through-hole 13. And form. The width of the slit is smaller than the diameter of the cylindrical through hole.

In the female metal fitting 20, a cylindrical rod 30 that is rotatably fitted in the cylindrical through hole 13 of the protruding portion 11 is rotatably supported through a peripheral wall 21 that is opposed to the female rod 20. The portion of the rod 30 that fits into the cylindrical through-hole 13 (shown in FIG. 1 with the cross-section being hatched) is formed as a flat chamfered portion 31 having a thickness slightly smaller than the width of the slit 14. Yes.
And as shown with a virtual line, the lever 40 which adheres to the one end part or both ends of the rod 30 in the outer side of the female metal fitting 20 is provided.

In the state where the lever 40 is rotated in the direction indicated by the arrow A in which the free end 41 serving as the operation portion is separated from the female metal fitting 20 as shown in FIGS. 31 becomes parallel to the slit 14.
When the male fitting 10 and the female fitting 20 of the fastener 1 for jewelry are connected, the protruding portion 11 of the male fitting 10 is moved from the separated state shown in FIG. 2 to the female as shown in FIG. When fitted into the mold 20, the chamfered portion 31 of the rod 30 passes through the slit 14 of the projection 11, and finally the chamfered portion 31 is cylindrical through-hole 13 as shown in FIG. Mates inside.

Therefore, the lever 40 is rotated in the direction indicated by the arrow B in which the free end 41 approaches the female fitting 20, and the free end 41 is moved to the outer peripheral surface of the female fitting 20 as shown in FIG. When the contact is made, the chamfered portion 31 of the rod 30 is inclined with respect to the slit 14.
As a result, even if a force for pulling out the male metal fitting 10 from the female metal fitting 20 is applied, the rod 30 cannot come out of the cylindrical through hole 13 into the slit 14. The connected state is reliably maintained.

  The inclination angle of the chamfered portion 31 of the rod 30 at this time, that is, the rotation angle of the rod 30 is an appropriate angle from about 20 ° to 90 ° (orthogonal state). The larger the inclination angle, the higher the retaining function. In the illustrated example, it is about 30 °.

  Further, in this embodiment, the base portion of the lever 40 is bifurcated, and is fixed to both ends of the rod 30 on both sides of the opposing peripheral wall 21 of the female metal fitting 20, and is integrated on the free end 41 side serving as the operation portion. ing. A locking piece 42 is provided in the vicinity of the free end 41, and when the lever 30 is rotated and pressed in the direction in which the free end 41 approaches the female metal fitting 20, the locking is performed. The piece 42 fits into the locking hole 22 formed in the peripheral wall 21 of the female metal fitting 20 and engages with the peripheral wall 21 near the inner periphery of the locking hole 22 so that the lever 30 does not rotate unintentionally. Lock it. In other words, the locking piece 42 and the locking hole 22 constitute a locking means. In this way, the connected state of the male metal fitting 10 and the female metal fitting 20 can be more reliably maintained.

  When releasing the connected state of the male fitting 10 and the female fitting 20 of the fastener 1 for jewelry, the free end 41 of the lever 40 is moved upward from the connected state shown in FIGS. Pulling the locking piece 42 from the locking hole 22 to release the lock, and when the lever 40 is rotated in the direction of arrow A to the right-handed end shown in FIG. 1B, the surface of the rod 30 fixed to it. The taking part 31 is parallel to the slit 14. Therefore, when a force is applied in the direction in which the male metal fitting 10 is pulled out from the female metal fitting 20, the male metal fitting 10 can be pulled out from the female metal fitting 20 through the state shown in FIG. 1A, as shown in FIG. Can be separated.

  Although not shown in FIG. 1, as shown in FIGS. 2 and 3, the rear end surface 12 a of the base 12 of the male metal fitting 10 and the rear end surface 20 a of the female metal fitting 20 each have a large number of pearls and jewels. Semi-ring-shaped engaging portions 15 and 25 are provided for engaging the wires and strings connected through penetrating gemstones or the like, or both ends of the chain accessory. Therefore, if both ends of a chain-like or chain-like accessory such as a necklace or a bracelet are respectively attached to the engaging portions 15 and 25, the male metal fitting 10 and the female metal fitting 20 of the attachment fastener 1 are provided. By connecting the necklace and the bracelet, the necklace and the bracelet can be formed in an endless shape in a state of being worn on the neck and the arm.

  In the connected state shown in FIG. 3, the jewelry accessory 1 is good in appearance because the jewelry accessory 1 as a whole is like a small square columnar accessory. In the figure, the dimensions are greatly enlarged, but the actual dimensions are as small as about 6 mm square on the outer circumference and about 20 mm in the total length in the connected state.

  The male metal fitting 10, the female metal fitting 20, the lever 40, and preferably the rod 30 are also preferably made of a metal material that does not adversely affect humans, such as gold, platinum, Silver, a gold alloy, a silver alloy, or the like has good workability and can match a jewel, and can maintain a high-class feeling of the accessory. In particular, white gold, which is 18 gold or a gold alloy, is optimal.

Next, the details of the protrusion 11 of the male metal fitting 10 and the rod 30 rotatably supported by the female metal fitting 20 in the fastener 1 for jewelry of this embodiment will be described with reference to FIGS.
4 is a perspective view showing the protrusion 11 and the rod 30, FIG. 5 is a front view of the protrusion 11, FIG. 6 is a front view of the rod 30, and FIG. 7 is a cross-sectional view taken along line YY in FIG. .

  As shown in FIGS. 4 and 5, a direction perpendicular to the fitting direction into the female metal fitting is formed through the space between the opposed side surfaces closer to the tip end portion 11 a than the center in the longitudinal direction of the rectangular columnar projection 11. A cylindrical through-hole 13 having a diameter R1 as an axis is formed. And the slit 14 which leads to the cylindrical through-hole 13 from the front end surface 11a of the insertion direction to the female metal fitting 10 is formed. The width of the slit 14, that is, the distance d between the two parallel opposing surfaces forming the slit 14 is smaller than the diameter R 1 of the cylindrical through hole. For example, d = R1 · 3/5.

  On the other hand, as shown in FIGS. 4, 6 and 7, the rod 30 has a columnar shape having a diameter R2 slightly smaller than the diameter R1 of the cylindrical through hole, and the width of the protrusion 11 ( The length of one side of the quadrangular column is chamfered from both the upper and lower sides in the radial direction and a flat chamfered portion 31 having a thickness e slightly smaller than the width d of the slit 14 is formed. Forming. Both end portions 32 and 32 are rotatably supported by the opposing peripheral walls 21 of the female metal fitting 20.

  In this embodiment, the male metal fitting 10 including the protrusion 11 is formed into a regular quadrangular columnar shape, and the female metal fitting 20 is formed into a regular square cylinder, and the axial direction of the cylindrical through-hole 13 of the protrusion 11 and the rod 30 is set when fitted. Although it is easy to match, it is not limited to this. For example, the male metal fitting 10 including the protrusion 11 is changed to a long rectangular column, a hexagonal column, an octagonal column, a cylinder, an elliptical column, other deformed columns, etc. An octagonal cylinder, a cylinder, an elliptical cylinder, other modified cylinders, and the like may be used. Further, the base 12 of the male metal fitting 10 and the outer peripheral surface of the female metal fitting 20 may be decorated.

Next, another embodiment of the fastener for jewelry according to the present invention will be described with reference to FIGS.
FIG. 8 is a front view showing a state where the male fitting and female fitting of the fastener for jewelry are separated, and FIG. 9 is a front view showing a state where the male fitting and female fitting are connected.

This accessory fastener 2 is obtained by cutting a metal member having an outer peripheral surface in a shape obtained by rotating an ellipse around a long axis (indicated by a dashed line 3 in FIG. 8) in a direction perpendicular to the long axis 3. The male metal fitting 50 and the female metal fitting 60 of the shape divided into two are provided.
The split surface 50a of the male metal fitting 50 is provided with a prismatic protrusion 51 protruding along the long axis direction of the ellipse, and the prismatic protrusion 51 is fitted into the split surface 60a of the female metal fitting 60. A square hole 61 is provided.

Further, similar to the above-described embodiment, the projecting portion 51 has a cylindrical through hole 53 whose axis is perpendicular to the direction in which the female metal fitting 60 is inserted into the square hole 61, and the direction in which the female fitting 60 is inserted into the square hole 61. A slit 54 having a width smaller than the diameter of the cylindrical through-hole 53 is formed through the cylindrical through-hole 53 from the front end surface thereof.
Further, when the projection 51 of the male metal fitting 50 is fitted into the square hole 61 of the female metal fitting 60, the cylindrical rod 70 that is rotatably fitted into the cylindrical through hole 53 is rotated. I support it as possible.

The rod 70 is chamfered into a flat plate shape having a thickness slightly smaller than the width of the slit 54 to form a chamfered portion. At least one of both ends of the rod 70 penetrates the female metal fitting 60, and a lever 80 is fixed to one end or both ends of the rod 70 outside the female metal fitting 60.
The lever 80 is formed in an inverted U shape or a ring shape along the outer surface of the female metal fitting 60, and the upper free end 81 in FIG. 8 and FIG. The surface of the free end portion 81 may be subjected to anti-slip processing using fine irregularities.

  When the lever 80 is rotated to the rotation end in the direction of arrow C in FIG. 8, the chamfered portion 71 of the rod 70 is in a state parallel to the slit 54. In this state, when the protrusion 51 of the male metal fitting 50 is fitted into the square hole 61 of the female metal fitting 60, the chamfered portion 71 of the rod 70 is fitted into the slit 54 as in the above-described embodiment. Further, when the split surface 50 a of the male metal fitting 50 and the split surface 60 a of the female metal fitting 60 are pushed in, the chamfered portion 71 of the rod 70 is fitted into the cylindrical through hole 53 of the protrusion 51.

In this state, as shown in FIG. 9, when the lever 80 is rotated to the rotation end in the arrow D direction opposite to the arrow C direction, the chamfered portion 71 of the rod 70 fixed to the lever 80 is slit. It is in a state of being inclined or orthogonal to 54. As a result, even if a force for pulling the male metal fitting 50 from the female metal fitting 60 is applied, the rod 70 cannot come out from the cylindrical through hole 53 into the slit 54, so that the male metal fitting 50 and the female metal fitting 60 can be removed. The connected state is reliably maintained.
The inclination angle at this time is the same as that described in the previous embodiment.
Also in this embodiment, it is preferable to provide means for locking the lever 80 in the state shown in FIG.

  Semi-ring-shaped engaging portions 55 and 65 are also provided at the rear end portion of the male metal fitting 50 and the rear end portion of the female metal fitting 60, respectively. If both ends of the jewelry are engaged, the male metal fitting 50 and the female metal fitting 60 of the jewelry accessory 2 are connected to form an endless shape with the necklace or bracelet attached to the neck or arm. be able to.

In the connected state shown in FIG. 9, the jewelry accessory 2 has a better appearance because the jewelry accessory 2 as a whole is like one small oval accessory. Although these figures also show the dimensions greatly enlarged, the actual dimensions are small with a minor axis of about 10 mm and a major axis of about 20 mm.
The outer shape can be made into an oval or oval shape, and the shape of the projection and the square hole can be variously changed in the same manner as the shape of the projection and the square tube described in the above embodiments.
The materials of the male metal fitting 50 and the female metal fitting 60 and the lever 80 and the rod 70 are the same as those in the above-described embodiment.

The jewelry fastener according to the present invention can basically be composed of the above-described male metal fitting, female metal fitting, rod and lever, and each shape is relatively simple, so that the structure is simple and manufactured. Easy. Moreover, since no spring is used, there is almost no secular change, and there is sufficient durability.
The preferred embodiment of the present invention has been described above. However, the present invention is not limited to this, and the material, shape, dimensions, and the like can be variously changed according to the application, the design of the accessory to be used, and the like. Of course.

  This invention is a bracelet accessory that is formed by connecting a number of jewels such as pearls, agates, and jewels and connecting them, or a chain accessory such as gold, silver, bratina, etc., such as a necklace or a bracelet. This accessory is suitable as a fastener for connecting both ends thereof to endless shape.

FIG. 4 is a front view of a process of fitting and connecting a male fitting of an embodiment of a jewelry fastener according to the present invention into a female fitting, with only the female fitting being a longitudinal section, and a lever being a phantom line. It is a front view which shows the state which isolate | separated the male metal fitting and female metal fitting of the fastener for the jewelry similarly. It is a front view which shows the state which connected the male type metal fitting and the female metal fitting. It is a front view which shows the state which similarly connected the male metal fitting and female metal fitting of the fastener for jewelry. It is a perspective view which shows the rod supported by the projection part of a male metal fitting, and a male metal fitting. It is a front view of a projection part. It is a front view of a rod. It is sectional drawing which follows the YY line | wire of FIG. It is a front view which shows the state which isolate | separated the male metal fitting and female metal fitting of one Example of the accessory fastener by this invention. It is a front view which shows the state which connected the male metal fitting and the female metal fitting. It is a front view which shows the state which similarly connected the male metal fitting and female metal fitting of the fastener for jewelry.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1, 2: Trinkets 10: Male metal fitting 11: Protrusion part 12: Base part 12a: Rear end surface 13 of base 12: Cylindrical through-hole 14: Slit 15: Engagement part 20: Female metal fitting 20a: Female metal fitting Rear end surface 21: peripheral wall 22: locking hole 25: engaging portion 30: rod 31: chamfered portion
40: Lever 42: Free end part (operation part) 22: Locking piece 50: Male metal fitting 50a: Split surface of male metal fitting 51: Projection
53: Cylindrical through-hole 54: Slit 55: Engaging portion 60: Female metal fitting 60a: Dividing surface of female metal fitting 61: Square hole
65: engaging part 70: rod 71: chamfering part 80: lever 81: free end part (operation part)

Claims (5)

A male metal fitting comprising a columnar block and a cylindrical female metal fitting for fitting the male metal fitting;
The male fitting is connected to a cylindrical through hole whose axis is perpendicular to the fitting direction into the female fitting, and from the front end surface in the fitting direction to the female fitting to the cylindrical through hole, Forming a slit with a width smaller than the diameter of the cylindrical through-hole,
A cylindrical rod that is rotatably fitted in the cylindrical through hole, and a portion that fits into the cylindrical through hole is chamfered into a flat plate having a thickness slightly smaller than the width of the slit, and a chamfered portion. The rod formed is provided to be rotatably supported by the female metal fitting,
Provide a lever that is fixed to one end or both ends of the rod outside the female metal fitting,
When the lever is rotated in a direction in which the free end of the lever moves away from the female metal fitting, the chamfered portion of the rod is in a state parallel to the slit, and the free end of the lever is A fastener for jewelry, wherein the chamfered portion of the rod is inclined or perpendicular to the slit when the rod is rotated in a direction approaching the metal mold.   The female metal fitting has a rectangular tube shape, the male metal fitting can be fitted into the rectangular tube-shaped female metal fitting, and a prismatic protrusion having the cylindrical through hole and the slit and its rear end The fastener for jewelry as set forth in claim 1, comprising: a prismatic base portion having the same thickness as the outer dimension of the female metal fitting provided in a portion.   Near the free end of the female metal fitting and the lever, the lever engages with each other when the free end of the lever is rotated to its rotational end position in a direction approaching the female metal fitting. The fastener for jewelry as claimed in any one of claims 1 to 3, further comprising means for locking the lever. A metal member having an outer peripheral surface of a shape obtained by rotating an ellipse around the major axis is cut into a direction orthogonal to the major axis and divided into two parts, a male metal fitting and a female metal fitting,
The split surface of the male metal fitting is provided with a prismatic protrusion protruding along the long axis direction of the ellipse, and the square hole for fitting the prismatic protrusion is provided on the split surface of the female metal fitting. ,
The projecting portion communicates with the cylindrical through-hole from a cylindrical through-hole whose axis is a direction orthogonal to the fitting direction into the square hole of the female metal fitting, and a tip end surface in the fitting direction into the square hole, Forming a slit having a width smaller than the diameter of the cylindrical through-hole,
A cylindrical rod that is rotatably fitted in the cylindrical through hole, and a portion that fits into the cylindrical through hole is chamfered into a flat plate having a thickness slightly smaller than the width of the slit, and a chamfered portion. The rod formed is provided to be rotatably supported by the female metal fitting,
Provide a lever that is fixed to one end or both ends of the rod outside the female metal fitting,
When the lever is rotated in one direction, the chamfered portion of the rod is in parallel with the slit, and when the lever is rotated in the opposite direction, the chamfered portion of the rod is in the slit. A fastener for jewelry, characterized in that it is inclined or perpendicular to the surface. 5. The male metal fitting, the female metal fitting, and the lever are all formed of gold, platinum, silver, or an alloy containing any of them. The fastener for jewelry described in 1.

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