CLASP AND TIMEPIECE

Description

CROSS-REFERENCE TO RELATED APPLICATIONS

The present application is based on, and claims priority from JP Application Serial Number 2024-093551, filed Jun. 10, 2024 the disclosure of which is hereby incorporated by reference herein in its entirety.

BACKGROUND OF THE INVENTION

1. Technical Field

The present disclosure relates to a clasp used as a band such as a timepiece band or a decorative tool band, and a timepiece including the clasp.

2. Related Art

JP-A-9-56425 discloses a push clasp in which a push operation of a push button can release an engagement between an engagement portion of the push button and an engagement pin of a front panel, and the push operation of the push button can be restricted by moving a lock member. In the push clasp, the lock member is moved to restrict the push operation of the push button, so that it is possible to prevent the engagement of the clasp from being released by an unintended push operation during the diving of a diver and a wristwatch from being dropped.

In the push clasp of JP-A-9-56425, when the lock member is erroneously moved to a position where the push operation is restricted in a state where the engagement of the clasp is released, the engagement portion of the push button and the engagement pin of the front panel cannot be engaged with each other, and there is a problem that the lock member needs to be operated again.

SUMMARY OF THE INVENTION

According to an aspect of the present disclosure, there is provided a clasp that couples a first band and a second band, the clasp including a coupling member coupled to a first band side and including an engaged portion, and a clasp main body coupled to a second band side, in which the clasp main body includes an engagement member configured to move to an engagement position where the engagement member is configured to engage with the engaged portion and a release position where the engagement member is configured to release an engagement with the engaged portion, an operation member that moves the engagement member from the engagement position to the release position, and a lock member configured to move to an operation restriction position where an operation of the operation member is restricted and an operation permission position where the operation of the operation member is permitted, the engagement member is configured to be engaged with the engaged portion without operating the operation member in a state where the engagement member is not engaged with the engaged portion, and the engagement is released by moving the engagement member to the release position by the operation member in a state where the engagement member is engaged with the engaged portion, and when the lock member is moved to the operation restriction position, the engagement member is restricted from being moved to the release position by the operation member.

The timepiece of the present disclosure includes a clasp, the first band, and the second band coupled to the clasp.

BRIEF DESCRIPTION OF DRAWINGS

FIG. 1 is a front view illustrating a wristwatch according to a first embodiment.

FIG. 2 is a perspective view illustrating a clasp in an open state of a middle fold member according to the first embodiment.

FIG. 3 is an exploded perspective view of the clasp according to the first embodiment.

FIG. 4 is an exploded perspective view of an engagement unit and a lock mechanism according to the first embodiment.

FIG. 5 is a plan view illustrating an operation permission state of a clasp main body according to the first embodiment.

FIG. 6 is a cross-sectional view illustrating the operation permission state of the clasp main body according to the first embodiment.

FIG. 7 is a plan view illustrating a push operation state of the clasp main body according to the first embodiment.

FIG. 8 is a plan view illustrating an operation restriction state of the clasp main body according to the first embodiment.

FIG. 9 is a cross-sectional view illustrating the operation restriction state of the clasp main body according to the first embodiment.

FIG. 10 is a cross-sectional view illustrating a main part of a clasp main body according to a second embodiment.

FIG. 11 is a plan view illustrating an operation restriction state of the clasp main body according to the second embodiment.

FIG. 12 is a cross-sectional view illustrating an operation permission state of the clasp main body according to the second embodiment.

FIG. 13 is a cross-sectional view illustrating a main part of a clasp main body according to a third embodiment.

FIG. 14 is a plan view illustrating an operation restriction state of the clasp main body according to the third embodiment.

FIG. 15 is a cross-sectional view illustrating an operation permission state of the clasp main body according to the third embodiment.

FIG. 16 is a cross-sectional view illustrating a main part of a clasp main body according to a fourth embodiment.

FIG. 17 is a plan view illustrating an operation restriction state of the clasp main body according to the fourth embodiment.

FIG. 18 is a cross-sectional view illustrating an operation permission state of the clasp main body according to the fourth embodiment.

FIG. 19 is a cross-sectional view illustrating an operation restriction state of a clasp main body according to a fifth embodiment.

FIG. 20 is a cross-sectional view illustrating an operation permission state of the clasp main body according to the fifth embodiment.

FIG. 21 is a plan view illustrating a main part of the clasp main body according to the fifth embodiment.

DETAILED DESCRIPTION OF THE INVENTION

First Embodiment

Hereinafter, a first embodiment of the present disclosure will be described with reference to the drawings. As illustrated in FIG. 1, a wristwatch 100 as a timepiece is provided with an exterior case 10, a first band 11, and a second band 12. Each of bows 10A is integrally provided in the six o'clock direction and the twelve o'clock direction of the exterior case 10. The first band 11 is coupled to the bow 10A in the six o'clock direction using a coupling pin, and the second band 12 is coupled to the bow 10A in the twelve o'clock direction using a coupling pin. The first band 11 and the second band 12 are constituted by coupling the plurality of band blocks 9 with pins (not illustrated). Open end portions of the first band 11 and the second band 12 are fastened to each other by a clasp 1 illustrated in FIGS. 2 to 4.

FIG. 2 is a perspective view of the clasp 1 in an open state of a middle fold member 2, and FIG. 3 is an exploded perspective view of the clasp 1. In the following description, the X axis is an axis along the longitudinal direction of the first band 11 and the second band 12. The Y axis is an axis along the width direction of the first band 11 and the second band 12, and is orthogonal to the X axis. The Z axis is an axis orthogonal to the X axis and the Y axis. On the X axis, the direction from the clasp main body 4 to the first band 11 is referred to as an X1 direction, and the direction from the clasp main body 4 to the second band 12 is referred to as an X2 direction. One direction of the Y axis is referred to as a Y1 direction, and the other direction is referred to as a Y2 direction. On the Z axis, the direction in which the clasp cover 40 is separated from the middle fold member 2 is referred to as a Z1 direction, and the direction in which the clasp cover 40 approaches the middle fold member 2 is referred to as a Z2 direction. In addition, the Z1 direction side of the clasp main body 4 may be expressed as the front surface side of the clasp 1, the Z2 direction side may be expressed as the rear surface side of the clasp 1, the Y1 direction side may be expressed as the left side, and the Y2 direction side may be expressed as the right side.

As illustrated in FIG. 2, the clasp 1 is provided with a middle fold member 2 and a clasp main body 4. The middle fold member 2 is provided with a middle plate 20 and an outer plate 30. The middle plate 20 is a member elongated along the X axis direction, which is the longitudinal direction of the first band 11, and an end portion on the X1 direction side is rotatably coupled to the first band 11 by a coupling pin 13. An end portion of the middle plate 20 on the X2 direction side is rotatably coupled to one end portion of the outer plate 30 by a coupling pin 14. In addition, the middle plate 20 is provided with a lock pin 21 as an engaged portion that protrudes to the front surface side. Therefore, the middle plate 20 is a coupling member coupled to the first band 11 side and has an engaged portion. In addition, the lock pin 21 is provided with a shaft portion 22 protruding from the middle plate 20 and an umbrella portion 23 provided at a tip end of the shaft portion 22. The outer plate 30 is provided with a shaft portion 31 rotatably coupled to the clasp main body 4, and a pair of outer plate arms 32 extending from both ends of the shaft portion 31 in the Y axis direction along the X axis direction and disposed on both left and right sides of the middle plate 20. As described above, a tip end of the outer plate arm 32 is rotatably coupled to the end portion of the middle plate 20 by the coupling pin 14. Therefore, when the middle fold member 2 is folded, the outer plate arm 32 is disposed on both left and right sides of the middle plate 20, each of the front surface and the rear surface of the middle plate 20 and the outer plate 30 is positioned on substantially the same plane, and the lock pin 21 is constituted to protrude from the front surface of the middle plate 20 and the outer plate 30.

Configuration of Clasp Main Body

As illustrated in FIG. 3, the clasp main body 4 is provided with a clasp cover 40, a clasp frame portion 50, a clasp coupling portion 55, an engagement unit 60, and a lock mechanism 70.

Configuration of Clasp Cover

As illustrated in FIG. 3, the clasp cover 40 is provided with a plate-shaped front surface portion 41 curved in an arc shape along the X axis direction, and a pair of side wall portions 42 protruding from an outer edge in the Y axis direction when viewed from the front surface side of the front surface portion 41 to the rear surface side. On the front surface portion 41, a pair of protrusion portions 411 continuous along the X axis direction, which is the longitudinal direction of the clasp cover 40, is formed at a predetermined interval in the Y axis direction. In addition, an elongated hole 412 along the X axis direction is formed between the protrusion portions 411 of the front surface portion 41.

Each of the side wall portions 42 is provided with the elongated hole 421 along the X axis direction. Each push button 64, which will be described later, is disposed in the elongated hole 421. In addition, the pair of side wall portions 42 is formed with through-holes 422 and 423 into which screws 46 for fixing the clasp cover 40 to the clasp frame portion 50 are inserted.

Configuration of Clasp Frame Portion

As illustrated in FIG. 3, the clasp frame portion 50 is provided with a pair of frames 51 coupled to the shaft portion 31 of the outer plate 30 by a coupling pin 15 (refer to FIG. 6). Each of the frames 51 is fixed to each side wall portion 42 of the clasp cover 40 with a screw 46. Each of the frames 51 is formed with a guide groove portion 511 in which a coupling position with the clasp coupling portion 55 can be changed in a plurality of stages.

Configuration of Clasp Coupling Portion

The clasp coupling portion 55 is coupled to the second band 12 and is provided with a holding unit 57 that holds an engagement pin 56 engaged with the guide groove portion 511. The engagement pin 56 is disposed between the clasp cover 40 and the clasp frame portion 50. The holding unit 57 is biased to the clasp frame portion 50 side with respect to the clasp cover 40 by a built-in spring, and engages the engagement pin 56 with the guide groove portion 511. By pushing the holding unit 57 from the rear surface side toward the clasp cover 40 side, the engagement pin 56 can be moved to the other guide groove portion 511, and thus the clasp cover 40 and the clasp frame portion 50 can be slid with respect to the second band 12 in a plurality of stages.

Configuration of Engagement Unit

As illustrated in FIG. 4, the engagement unit 60 is provided with a guide frame 61, a pair of slide plates 62 as engagement members, a pair of coil springs 63 as biasing members, and a pair of push buttons 64 as operation members. The guide frame 61 is provided with a bottom surface portion 611, side surface portions 612 and 613, and guide portions 614 and 615. The bottom surface portion 611 is formed in a rectangular plate shape, and an insertion hole 6111 into which the lock pin 21 is inserted is formed. The side surface portions 612 and 613 are formed to protrude from the outer edge of the bottom surface portion 611 in the X1 direction and the X2 direction toward the front surface side. The interval between the side surface portions 612 and 613 in the X axis direction is a dimension that matches the width dimension of the slide plate 62. A rectangular recessed groove 6121 in which a lock member 71 described later is disposed is formed at the central position of the side surface portion 612 in the Y axis direction. The guide portions 614 are projected from the side surface portion 612 in the X2 direction, and a pair of the guide portions 614 is formed in the left and right sides sandwiching the recessed groove 6121. The guide portion 614 is formed in a substantially ¼ circular shape in a plan view, and has a shape along the lock member 71. The guide portion 615 is projected from the side surface portion 613 in the X1 direction and is continuously formed along the Y axis direction. Therefore, the length dimension of the guide portion 615 in the Y axis direction is set to a length dimension reaching from one guide portion 614 to the other guide portion 614. The bottom surface portion 611 and the guide portions 614 and 615 are separated from each other in the Z axis direction. Therefore, when the pair of slide plates 62 is inserted between the bottom surface portion 611 and the guide portions 614 and 615, the slide plates 62 are disposed to be movable only in the Y axis direction. In addition, the interval between the guide portion 614 and the guide portion 615 in the X axis direction is set to a dimension in which the lock member 71, which will be described later, can be moved to an operation restriction position and an operation permission position.

Configuration of Slide Plate

As illustrated in FIG. 4, each slide plate 62 is provided with a main body portion 620, an engagement portion 621, and a coupling portion 622 that couples the main body portion 620 and the engagement portion 621. The engagement portion 621 of one slide plate 62 is disposed between the engagement portion 621 of the other slide plate 62 and the main body portion 620. Similarly, the engagement portion 621 of the other slide plate 62 is disposed between the engagement portion 621 of one slide plate 62 and the main body portion 620. Therefore, when each of the engagement portions 621 is disposed to face each other, and each of the slide plates 62 approaches each other, each of the engagement portions 621 moves in a direction in which the engagement portions 621 are separated, and when each of the slide plates 62 moves in a direction in which the slide plates 62 are separated, each of the engagement portions 621 moves in a direction in which the engagement portions 621 approach each other. Therefore, the pair of slide plates 62 as the engagement members can be moved between an engagement position where the pair of engagement portions 621 is close to each other and can be engaged with the lock pin 21 as an engaged portion, and a release position where the pair of engagement portions 621 is separated from each other and the engagement with the lock pin 21 as an engaged portion can be released. As illustrated in FIG. 5, a first recessed groove portion 623 that holds the lock member 71 at the operation restriction position and a second recessed groove portion 624 that holds the lock member 71 at the operation permission position are formed in the end surface of the main body portion 620 in the Y axis direction. The first recessed groove portion 623 and the second recessed groove portion 624 are partitioned by a protrusion 625. As illustrated in FIG. 6, on the facing surfaces of the engagement portions 621 facing each other, inclined surfaces 626 inclined in a direction away from each other from the front surface side toward the rear surface side are formed. The inclined surface 626 is continuously formed from the intermediate position on the facing surface of the engagement portion 621 in the Z axis direction to the lower end in the Z2 direction. Therefore, each engagement portion 621 has a claw shape in which the thickness dimension in the Z axis direction is reduced toward the engagement portion 621 facing each other.

As illustrated in FIG. 4, the coil spring 63 as a biasing member is disposed between the main body portion 620 and the coupling portion 622, and biases the pair of slide plates 62 in a direction in which the slide plates 62 are separated from each other in the Y axis direction. When each slide plate 62 moves in a direction in which the slide plates 62 are separated from each other, each engagement portion 621 moves in a direction in which the engagement portions 621 approach each other. At this time, when the shaft portion 22 of the lock pin 21 is disposed between the engagement portions 621, the interval between the engagement portions 621 is smaller than that of the umbrella portion 23 and is prevented from falling out, and thus, each engagement portion 621 can be engaged with the lock pin 21 as an engaged portion.

The pair of push buttons 64 is an operation member that moves each of the pair of slide plates 62 as an engagement member from the engagement position to the release position. The push button 64 is provided with a button main body 641 and a flange portion 642 formed in an end surface of the button main body 641. The button main body 641 is inserted into the elongated hole 421 of the side wall portion 42 from the inside of the clasp cover 40, and the flange portion 642 is locked to the side wall portion 42, so that the push button 64 is prevented from falling out to the outside. In addition, a storage groove 643 is formed along the Z axis direction on the end surface of the button main body 641 in which the flange portion 642 is formed. The storage groove 643 is formed at a position facing the second recessed groove portion 624 of the slide plate 62 in the Y axis direction. In each push button 64, the end surface on which the flange portion 642 is formed abuts on the slide plate 62, and the slide plate 62 is biased in a direction in which the slide plate 62 is separated from each other by the coil spring 63. Therefore, each push button 64 is also biased in a direction in which the push buttons 64 are separated from each other in the Y axis direction, the flange portion 642 abuts on the inner surface of the side wall portion 42, and the button main body 641 protrudes from the elongated hole 421 to the outside of the side wall portion 42. In addition, when the button main body 641 of the push button 64 is pressed by the user and approaches each other, each slide plate 62 moves in a direction in which the slide plates 62 approach each other in the Y axis direction, and each engagement portion 621 moves in a direction in which the engagement portions 621 are away from each other. At this time, when each engagement portion 621 is engaged with the lock pin 21, the interval between the engagement portions 621 is larger than the diameter of the umbrella portion 23 of the lock pin 21, and the engagement portion 621 can be released from the lock pin 21. Furthermore, since the inclined surface 626 is formed in the engagement portion 621 of the slide plate 62, when the umbrella portion 23 of the lock pin 21 abuts on the inclined surface 626 from the rear surface side of the engagement portion 621, the inclined surface 626 is pushed to the outside by the umbrella portion 23. Therefore, the slide plate 62 moves in a direction in which the slide plates 62 approach each other against the biasing force of the coil spring 63, and the engagement portions 621 move in a direction in which the engagement portions 621 are separated from each other. When the umbrella portion 23 passes over the engagement portion 621, the slide plate 62 is biased in a direction away from each other by the coil spring 63, the engagement portions 621 approach each other, and are engaged with the shaft portion 22 of the lock pin 21.

Configuration of Lock Mechanism

The lock mechanism 70 is set to switch between an operation restriction state in which the push operation of the push button 64 as an operation member is restricted and an operation permission state in which the push operation is permitted. As illustrated in FIG. 4, the lock mechanism 70 is provided with a lock member 71, a movement operation member 72 that moves the lock member 71, and a fixing screw 73 that fixes the movement operation member 72 to the lock member 71.

The lock member 71 is provided with a main body portion 711 disposed in the recessed groove 6121 of the guide frame 61, a pair of extension portions 712 extending from the main body portion 711 in each of the Y1 direction and the Y2 direction, and a pair of restriction portions 713 having a round shaft shape protruding from the tip end of each extension portion 712 in the Z2 direction. Therefore, when the main body portion 711 and the extension portion 712 are disposed on the front surface side of the slide plate 62, that is, on the Z1 direction side, the restriction portion 713 protruding on the Z2 direction side from the main body portion 711 and the extension portion 712 can be engaged with the first recessed groove portion 623 and the second recessed groove portion 624. The main body portion 711 is formed with a through-hole 714 penetrating in the Z axis direction and a groove portion 715 opened on the X2 direction side. By forming the groove portion 715, it is possible to prevent the lock member 71 from interfering with the umbrella portion 23 of the lock pin 21.

The movement operation member 72 is provided with an operation panel 721 disposed between the protrusion portions 411 of the clasp cover 40 and slide-operated by the user in the X axis direction, and a fixing shaft portion 722 projecting from the lower surface of the operation panel 721 and inserted into the elongated hole 412 of the clasp cover 40 and the through-hole 714 of the lock member 71. The operation panel 721 is provided with a logo display portion 7211 on which a logo is displayed. The logo displayed on the logo display portion 7211 includes at least one of a character, a number, a symbol, and a figure, and represents a brand or a manufacturer of the timepiece.

As illustrated in FIG. 6, two protrusion portions 723 are formed in the lower surface of the operation panel 721 along the X axis direction. The contact area between the operation panel 721 and the front surface portion 41 can be reduced by the protrusion portion 723, and the operation panel 721 can be smoothly slid and moved. There is a possibility that the front surface portion 41 may be scratched by the contact of the protrusion portion 723 with the front surface portion 41. Therefore, in the present embodiment, the length dimension of the protrusion portion 723 in the X axis direction is shorter than that of the operation panel 721, and the protrusion portion 723 is always covered with the operation panel 721 in the range where the protrusion portion 723 comes into contact with the front surface portion 41 when the operation panel 721 slides. Therefore, even when the front surface portion 41 is damaged, the scratch is not exposed on the front surface side of the clasp main body 4. The fixing screw 73 is screwed into the fixing shaft portion 722 inserted through the through-hole 714 sandwiching the lock member 71, and fixes the movement operation member 72 to the lock member 71. Therefore, the lock member 71 and the movement operation member 72 are integrally moved in the X axis direction. As illustrated in FIG. 6, a recessed portion 716 in which a head portion of the fixing screw 73 is stored is formed in the rear surface of the lock member 71. When the lock member 71 is moved in the X axis direction by sliding the movement operation member 72, and the restriction portion 713 moves between the first recessed groove portion 623 and the second recessed groove portion 624, the restriction portion 713 is configured to push the protrusion 625 and move the slide plate 62 in the direction in which the slide plates 62 approach each other, so that the restriction portion 713 can be moved over the protrusion 625. When the restriction portion 713 moves to the first recessed groove portion 623 or the second recessed groove portion 624 over the protrusion 625, the slide plate 62 moves in a direction in which the slide plate 62 is separated from each other by the biasing force of the coil spring 63, and the first recessed groove portion 623 or the second recessed groove portion 624 abuts on the restriction portion 713. Therefore, when the user slides the movement operation member 72, the click feeling is transmitted when the restriction portion 713 passes over the protrusion 625, and the user can recognize that the lock member 71 is moved to the operation restriction position or the operation permission position.

In addition, since the slide plate 62 is biased in a direction in which the slide plates 62 are separated from each other by the coil spring 63, the first recessed groove portion 623 or the second recessed groove portion 624 of the slide plate 62 is pressed against the restriction portion 713 of the lock member 71. Therefore, the lock member 71 is maintained in one state of an operation restriction position where the restriction portion 713 is disposed in the first recessed groove portion 623 or an operation permission position where the restriction portion 713 is disposed in the second recessed groove portion 624, unless the user slides the movement operation member 72. That is, the restriction portion 713 of the lock member 71 is engaged with the first recessed groove portion 623, and thus the lock member 71 is held at the operation restriction position. Therefore, a positioning portion is configured with the restriction portion 713, and a holding portion is configured with the first recessed groove portion 623.

Next, an operation permission state and an operation restriction state of the push button 64 by the lock mechanism 70 will be described with reference to FIGS. 5 to 9.

Operation Permission State

A state in which the movement operation member 72 is moved to the X1 direction side is an operation permission state. In the operation permission state, as illustrated in FIGS. 5 and 6, the lock member 71 is moved to the X1 direction side, and the restriction portion 713 is positioned in the second recessed groove portion 624 of the slide plate 62. Even in the operation permission state illustrated in FIG. 5, each slide plate 62 is biased in a direction in which the slide plates 62 are separated from each other by the coil spring 63, and each engagement portion 621 is moved in a direction in which the engagement portions 621 approach each other and is engaged with the lock pin 21. In addition, the slide plate 62 abuts on the push button 64, and the push button 64 is biased to a state where the flange portion 642 abuts on the side wall portion 42.

In the operation permission state, the restriction portion 713 is disposed at a position facing the storage groove 643 of the push button 64. Therefore, as illustrated in FIG. 7, when the user performs a push operation of the push button 64, the restriction portion 713 is stored in the storage groove 643, and the push button 64 can be pushed. As a result, the pair of slide plates 62 moves in the direction of approaching each other and moves to the release position. Therefore, the interval between the engagement portions 621 is larger than the umbrella portion 23 of the lock pin 21, and the engagement state with the lock pin 21 can be released. In the present embodiment, the release position of the slide plate 62 is a position where one engagement portion 621 abuts on the other main body portion 620, and is a position where the restriction portion 713 abuts on the bottom portion of the storage groove 643. Therefore, the user can reliably move the slide plate 62 to the release position by pressing the push button 64 until the push button 64 cannot be moved.

Operation Restriction State

A state in which the movement operation member 72 is moved to the X2 direction side is the operation restriction state. In the operation restriction state, as illustrated in FIGS. 8 and 9, the lock member 71 is moved to the X2 direction side, and the restriction portion 713 is held at the first recessed groove portion 623 of the slide plate 62. Even in the operation restriction state illustrated in FIG. 8, each slide plate 62 is biased in a direction in which the slide plates 62 are separated from each other by the coil spring 63, and each engagement portion 621 is moved in a direction in which the engagement portions 621 approach each other and is engaged with the lock pin 21.

In the operation restriction state, the restriction portion 713 is disposed at a position that does not face the storage groove 643 of the push button 64. Therefore, even when the user performs a push operation of pushing the push button 64, since the push button 64 abuts on the restriction portion 713, the movement of the push button 64 is restricted. Therefore, the operation of the push button 64 is restricted, the slide plate 62 is maintained in a separated state by the coil spring 63, and the engagement state between the lock pin 21 and the engagement portion 621 is also maintained.

Next, a method of wearing the wristwatch 100 on the wrist of the user will be described. In the operation restriction state illustrated in FIG. 8, the lock member 71 restricts the push operation of the push button 64, but does not restrict the movement of the pair of slide plates 62 in the direction of approaching each other. Therefore, as illustrated in FIG. 2, in a state where the middle plate 20 and the outer plate 30 of the middle fold member 2 are open, not only when the lock member 71 is at the operation permission position, that is, the restriction portion 713 is positioned in the second recessed groove portion 624, but also when the lock member 71 is at the operation restriction position, that is, the restriction portion 713 is positioned in the first recessed groove portion 623, the middle plate 20 and the outer plate 30 are closed and the slide plate 62 of the clasp main body 4 is pressed against the lock pin 21. Therefore, the wristwatch 100 can be worn by engaging the slide plate 62 with the lock pin 21 without performing the push operation of the push button 64. That is, the upper end of the lock pin 21 is a conical trapezoidal umbrella portion 23, and the diameter of an upper bottom of the umbrella portion 23 is smaller than the diameter of a lower bottom of the umbrella portion 23. In addition, the lower side of the facing surfaces of the pair of engagement portions 621 is an inclined surface 626 inclined in a direction away from each other. The dimension between the lower ends of each inclined surface 626 is larger than the diameter of the upper bottom of the umbrella portion 23, and the dimension between the upper ends of each inclined surface 626 is smaller than the diameter of the lower bottom of the umbrella portion 23. Therefore, when the middle fold member 2 is closed and the umbrella portion 23 is inserted between the engagement portions 621, the side surface of the umbrella portion 23 abuts on the inclined surface 626, and the pair of engagement portions 621, that is, the pair of slide plates 62 is pushed outward against the biasing force of the coil spring 63. Therefore, the side surface of the umbrella portion 23 of the lock pin 21 as the engaged portion and the inclined surface 626 of the slide plate 62 as the engagement member are guide surfaces that move the slide plate 62 from the engagement position to the release position against the biasing force of the coil spring 63 when the engagement portion 621 of the slide plate 62 abuts on the lock pin 21. Furthermore, when the clasp main body 4 is pushed toward the middle plate 20 side, the umbrella portion 23 of the lock pin 21 is removed from the facing surface of the engagement portion 621, and the shaft portion 22 is disposed between the engagement portions 621. Therefore, the engagement portion 621 which is pushed by the umbrella portion 23 moves in the direction in which the engagement portions 621 approach each other by the biasing force of the coil spring 63. As a result, each engagement portion 621 abuts on and engages with the shaft portion 22 of the lock pin 21. In this manner, the wristwatch 100 can be worn on the wrist.

Next, a method of locking the wristwatch 100 so that the wristwatch 100 is not removed from the wrist by diving or the like will be described. When the wristwatch 100 is worn on the wrist and in a case in which the lock member 71 is at the operation permission position, the movement operation member 72 may be moved to the X2 direction side, and may be moved to the operation restriction position where the restriction portion 713 of the lock member 71 is held at the first recessed groove portion 623. In addition, when the wristwatch 100 is worn on the wrist, the state may be maintained when the lock member 71 is already at the operation restriction position. When the lock member 71 is at the operation restriction position, even in a case in which an unintended external force is applied to the push button 64, the push button 64 is restricted from being pushed by the restriction portion 713 of the lock member 71, and it is possible to prevent the engagement between the lock pin 21 and the slide plate 62 from being released.

Next, a method of removing the wristwatch 100 from the wrist will be described. When the wristwatch 100 is removed, in a case in which the lock member 71 is at the operation restriction position, the movement operation member 72 is moved to the X1 direction side to move the lock member 71 to the operation permission position. As a result, the restriction portion 713 of the lock member 71 can move to the second recessed groove portion 624, and the push button 64 is in an operable state. In a state where the lock member 71 is at the operation permission position, each of the push buttons 64 is pressed to move the engagement portion 621 in a direction away from each other, and the middle plate 20 and the outer plate 30 that are folded are opened in a state where the engagement between the lock pin 21 and the slide plate 62 is released. As a result, the umbrella portion 23 of the lock pin 21 passes through a space between the engagement portions 621 and is pulled out from an insertion hole 6111 of the guide frame 61. In this manner, the wristwatch 100 can be removed from the wrist.

Effects of First Embodiment

According to the clasp 1 of the first embodiment, the push operation of the push button 64 is restricted by moving the lock member 71 to the operation restriction position, and the slide plate 62 cannot be moved to the release position. Therefore, even when an unintended external force is applied to the push button 64, the engagement between the slide plate 62 and the lock pin 21 can be maintained. Therefore, by moving the lock member 71 to the operation restriction position, it is possible to reliably prevent the clasp 1 from being removed during the diving or the like. In addition, since the slide plate 62 and the push button 64 are configured separately and the lock member 71 has a structure that restricts only the push operation of the push button 64, the slide plate 62 can be engaged with the lock pin 21 without operating the push button 64 in a state where the slide plate 62 is not engaged with the lock pin 21. Therefore, even when the lock member 71 is erroneously moved to the operation restriction position at the time of opening the clasp 1, that is, in a state where the slide plate 62 is not engaged with the lock pin 21 by opening the middle fold member 2, the slide plate 62 can be moved to be engaged with the lock pin 21. Therefore, the arm can be reliably worn with the wristwatch 100 having the clasp 1 without the clasp 1 in a state of not being closed or being damaged by forcibly closing the clasp 1.

In a state where the lock member 71 is moved to the operation permission position, the clasp 1 can be opened by operating the push button 64. Therefore, in daily use, the operability when wearing or removing the wristwatch 100 does not deteriorate, and the wristwatch 100 can be used in the same operation as a normal clasp not provided with the lock mechanism 70.

Since the slide plate 62 abuts on the push button 64 by the coil spring 63, it is not necessary to separately provide a spring that biases the push button 64, which is separate from the slide plate 62, and the number of components can be reduced accordingly, and the cost can be reduced. Furthermore, since the push operation of the push button 64 can be restricted only by disposing the restriction portion 713 of the lock member 71 between the slide plate 62 and the push button 64, it is not necessary to adopt a complicated structure, and the cost can be reduced in this respect. In addition, when the restriction portion 713 of the lock member 71 is disposed in the first recessed groove portion 623 or the second recessed groove portion 624, since the slide plate 62 is biased to the restriction portion 713 side by the coil spring 63, the first recessed groove portion 623 or the second recessed groove portion 624 can abut on the restriction portion 713. Therefore, the restriction portion 713 can be reliably held at the first recessed groove portion 623 or the second recessed groove portion 624, and even when the arm to which the wristwatch 100 is worn moves, the lock member 71 can be held at the operation restriction position or the operation permission position. Furthermore, when the movement operation member 72 is operated to move the restriction portion 713 of the lock member 71 between the first recessed groove portion 623 and the second recessed groove portion 624, the restriction portion 713 abuts on the protrusion 625 and pushes the slide plate 62 against the biasing force of the coil spring 63. Therefore, resistance occurs when the movement operation member 72 is operated. After the lock member 71 is slid, the first recessed groove portion 623 or the second recessed groove portion 624 abuts on the restriction portion 713, and the resistance at the time of sliding is also eliminated. Therefore, the position of the slide plate 62 can be fixed, and a click feeling at the time of operation can be obtained. In addition, since these functions use the biasing force of the coil spring 63, the resistance force during the sliding movement can also be reduced, the operability of the movement operation member 72 does not deteriorate, and the durability when the lock member 71 is repeatedly moved can also be improved.

The lock member 71 is disposed between the front surface portion 41 of the clasp cover 40 and the engagement unit 60, and the lock member 71 and the engagement unit 60 are disposed to be overlapped in the Z axis direction. Therefore, the length dimension of the clasp main body 4 in the X axis direction can be shortened as compared with a case where the lock member is disposed on the side of the engagement unit 60, that is, in the X axis direction. In addition, since the groove portion 715 is formed in the lock member 71 to prevent interference with the lock pin 21, it is not necessary to dispose the lock member 71 to be shifted in the X axis direction with respect to the lock pin 21, and the length dimension of the clasp main body 4 in the X axis direction can be shortened in this respect. In addition, since it is not necessary to set the height position of the lock member 71 in the Z axis direction to be higher than that of the umbrella portion 23 of the lock pin 21, the thickness dimension of the clasp main body 4 can also be reduced.

The lock member 71 and the movement operation member 72 are coupled to each other with the fixing screw 73 via the elongated hole 412 of the clasp cover 40. Therefore, the width dimension of the movement operation member 72 in the Y axis direction can be shorter than that of the lock member 71, the movement operation member 72 can be disposed at the center in the width direction on the front surface portion 41 of the clasp cover 40, and the elongated hole 412 can be hidden. Therefore, the appearance of the clasp 1 can be improved. Since the logo display portion 7211 is provided on the movement operation member 72, the logo such as the brand or the manufacturer can be displayed, the brand name or the manufacturer name can be emphasized, and the appearance of the clasp 1 can be further improved. In addition, since the movement operation member 72 is coupled to the lock member 71 with the fixing screw 73, the movement operation member 72 can be replaced, and the maintenance can be easily performed when the movement operation member 72 is scratched or the like. Furthermore, the material of the movement operation member 72 can be different from that of the lock member 71, and customization using different materials can be realized.

Second Embodiment

A clasp 1B of a second embodiment will be described with reference to FIGS. 10, 11, and 12. In each of the second embodiment and the following embodiments, the same reference numerals are given to the same or corresponding components as those of the first embodiment, and the description thereof will be simplified or omitted. The clasp 1B is provided with a clasp cover 40B, an engagement unit 60, and a lock mechanism 70B. The clasp cover 40B is formed with a flat rectangular opening 412B. The engagement unit 60 has the same configuration as that of the first embodiment, and is provided with the guide frame 61, the slide plate 62, the coil spring 63, and the push button 64. The lock mechanism 70B is provided with a lock member 71B. The lock member 71B is provided with a rectangular plate-shaped main body portion 711B, a pair of restriction portions 713B protruding from the lower surface of the main body portion 711B, and an operation lever portion 717B protruding from the main body portion 711B to the front surface side. For example, the lock member 71B can be formed of an injection molded product made of synthetic resin. The operation lever portion 717B protrudes from the main body portion 711B to the front surface side, and is inserted into the opening 412B formed in the clasp cover 40B to protrude to the front surface side of the clasp cover 40B. In FIGS. 11 and 12, in order to make the slide plate 62 and the push button 64 easy to see, a part of the components such as the lock mechanism 70B, the coil spring 63, the lock pin 21, and the opening 412B are illustrated by various dotted lines.

Also in the clasp 1B of the second embodiment, the operation lever portion 717B is slid and moved in the X axis direction in the opening 412B. Therefore, the restriction portion 713B of the lock member 71B can be moved from one to the other of the first recessed groove portion 623, which is the operation restriction position, and the second recessed groove portion 624, which is the operation permission position. By positioning the restriction portion 713B in the first recessed groove portion 623, the push operation of the push button 64 can be restricted. By positioning the restriction portion 713B in the second recessed groove portion 624, the push operation of the push button 64 can be permitted. Therefore, also in the clasp 1B of the second embodiment, by moving the lock member 71B to the operation restriction position, even when the push button 64 is unintentionally pressed during the diving or the like, the engagement state between the lock pin 21 and the slide plate 62 can be maintained, and the same effect as that of the clasp 1 of the first embodiment can be obtained. In addition, since the lock member 71B provided with the main body portion 711B, the restriction portion 713B, and the operation lever portion 717B can be manufactured by integral molding, the workability of the assembly can be improved as compared with the lock mechanism 70 in which the lock member 71 and the movement operation member 72 are assembled with the fixing screw 73.

Third Embodiment

A clasp 1C of the third embodiment will be described with reference to FIGS. 13, 14, and 15. The clasp 1C is provided with a clasp cover 40C, an engagement unit 60C, and a lock mechanism 70C. An opening groove 412C is formed in the side surface of the clasp cover 40C on the X1 direction side. The engagement unit 60C is provided with the guide frame 61, the slide plate 62C, the coil spring 63, and the push button 64C. The first recessed groove portion 623C and a protrusion 625C are formed in the slide plate 62C. The push button 64C is formed with a storage groove 643C on the X1 direction side from a position facing the apex of the protrusion 625C. The lock mechanism 70C is provided with a lock member 71C. The lock member 71C is provided with a rectangular plate-shaped main body portion 711C, a pair of extension portions 712C extending from the main body portion 711C, and an operation lever portion 717C protruding from a short portion of the main body portion 711C in the X1 direction toward the front surface side. The main body portion 711C is disposed in the opening groove 412C of the clasp cover 40C, and the operation lever portion 717C is disposed at a position protruding from the side surface of the clasp cover 40C on the X1 direction side. For example, the lock member 71C can be formed of an injection molded product made of synthetic resin. A recessed portion 7121 is formed in the inner side surface of each extension portion 712C, and a tip end side of the recessed portion 7121 serves as a restriction portion 713C.

In the clasp 1C of the third embodiment, the operation lever portion 717C protruding from the clasp cover 40C is slid and moved in the X axis direction. Therefore, the operation restriction state in which the restriction portion 713C of the lock member 71C is disposed in the first recessed groove portion 623C as illustrated in FIG. 14 and the operation permission state in which the restriction portion 713C of the lock member 71C is disposed on the X1 direction side of the protrusion 625C as illustrated in FIG. 15 can be switched. In order to switch from the operation permission state to the operation restriction state, it is necessary for the user to slide the operation lever portion 717C in the X2 direction so that the restriction portion 713C passes over the protrusion 625C. Therefore, the user does not switch from the operation permission state to the operation restriction state without operating the operation lever portion 717C. In addition, in the operation restriction state, the protrusion 625C is fitted in the recessed portion 7121, and thus the lock member 71C is held at the operation restriction position. Therefore, the user can switch the operation restriction state to the operation permission state only when the user slides the operation lever portion 717C in the X1 direction and the restriction portion 713C passes over the protrusion 625C. In the operation restriction state, as illustrated in FIG. 14, the restriction portion 713C is held at the first recessed groove portion 623C and abuts on the push button 64C, and thus, the push operation of the push button 64C can be restricted. In the operation permission state, as illustrated in FIG. 15, the restriction portion 713C is disposed at a position facing the storage groove 643C, and thus, the push operation of the push button 64C can be permitted. Therefore, also in the clasp 1C of the third embodiment, by moving the lock member 71C to the operation restriction position, even when the push button 64C is unintentionally pressed during the diving or the like, the engagement state between the lock pin 21 and the slide plate 62C can be maintained, and the same effect as that of the clasp 1 of the first embodiment can be obtained. In addition, since the lock member 71C is disposed on the X1 direction side of the slide plate 62C and is not disposed to overlap the slide plate 62C on the front surface side, the thickness dimension of the clasp 1C can be reduced.

Fourth Embodiment

A clasp 1D of a fourth embodiment will be described with reference to FIGS. 16, 17, and 18. The clasp 1D is provided with a clasp cover 40D, an engagement unit 60C, and a lock mechanism 70D. An opening 412D is formed in the front surface of the clasp cover 40D. Since the engagement unit 60C has the same configuration as that of the third embodiment, the description thereof will be omitted with the same reference numerals. The lock mechanism 70D is provided with a lock member 71D and a movement operation member 72D. The lock member 71D is provided with a rod-shaped main body portion 711D, a pair of extension portions 712D extending from the main body portion 711D, and a coupling portion 718D extending from the main body portion 711D in the X1 direction. The movement operation member 72D is disposed on the front surface side of the clasp cover 40D, and is fixed to the coupling portion 718D with a pin or a screw through the opening 412D. A recessed portion 7121 is formed in the inner side surface of each extension portion 712D, and a tip end side of the recessed portion 7121 serves as a restriction portion 713D.

Also in the clasp 1D of the fourth embodiment, similar to the third embodiment, the movement operation member 72D provided on the front surface side of the clasp cover 40D is slid and moved in the X axis direction. Therefore, the operation restriction state in which the restriction portion 713D of the lock member 71D is disposed in the first recessed groove portion 623C as illustrated in FIG. 17 and the operation permission state in which the restriction portion 713D of the lock member 71D is disposed on the X1 direction side of the protrusion 625C as illustrated in FIG. 18 can be switched. In the operation restriction state, as illustrated in FIG. 17, the restriction portion 713D is held at the first recessed groove portion 623C and abuts on the push button 64C, and thus, the push operation of the push button 64C can be restricted. In the operation permission state, as illustrated in FIG. 18, the restriction portion 713D is disposed at a position facing the storage groove 643C, and thus, the push operation of the push button 64C can be permitted. Therefore, also in the clasp 1D of the fourth embodiment, by moving the lock member 71D to the operation restriction position, even when the push button 64C is unintentionally pressed during the diving or the like, the engagement state between the lock pin 21 and the slide plate 62C can be maintained, and the same effect as that of the clasp 1 of the first embodiment can be obtained. In addition, since the lock member 71D is disposed on the X1 direction side of the slide plate 62C and is not disposed to overlap the slide plate 62C on the front surface side, the thickness dimension of the clasp 1D can be reduced. Furthermore, since the movement operation member 72D is provided, the logo can be displayed similarly to the movement operation member 72.

Fifth Embodiment

A clasp 1E of the fifth embodiment will be described with reference to FIGS. 19, 20, and 21. The clasp 1E is provided with a clasp cover 40E, an engagement unit 60E, and a lock mechanism 70E. Two through-holes 412E are formed in the front surface of the clasp cover 40E. The engagement unit 60E is provided with the guide frame 61, a slide plate 62E, the coil spring 63, and a push button 64E. Here, the first recessed groove portion 623E is formed in the surface of the slide plate 62E facing the push button 64E. The lock mechanism 70E is provided with a lock member 71E. The lock member 71E is provided with a rectangular plate-shaped main body portion 711E and a pair of restriction portions 713E protruding from the lower surface of the main body portion 711E. The main body portion 711E of the lock member 71E is disposed on the front surface side of the clasp cover 40E and serves as a movement operation member. In addition, the pair of restriction portions 713E of the lock member 71E is formed in a round shaft shape and is inserted into the through-holes 412E of the clasp cover 40E.

In the clasp 1E of the fifth embodiment, the main body portion 711E disposed on the front surface of the clasp cover 40E is moved in the Z axis direction. Therefore, the operation restriction state in which the restriction portion 713E of the lock member 71E is positioned in the clasp cover 40E and is disposed in the first recessed groove portion 623E, as illustrated in FIG. 19 and the operation permission state in which the restriction portion 713E of the lock member 71E is pulled up from the inside of the clasp cover 40E and is not disposed in the first recessed groove portion 623E, as illustrated in FIG. 20 can be switched. In the operation restriction state, as illustrated in FIG. 19, the restriction portion 713E is disposed in the first recessed groove portion 623E and abuts on the push button 64E, and thus, the push operation of the push button 64E can be restricted. In the operation permission state, as illustrated in FIG. 20, the restriction portion 713E is pulled up from the first recessed groove portion 623E to a position not facing the push button 64E, and thus, the push operation of the push button 64E can be permitted. Therefore, also in the clasp 1E of the fifth embodiment, by moving the lock member 71E to the operation restriction position, even when the push button 64E is unintentionally pressed during the diving or the like, the engagement state between the lock pin 21 and the slide plate 62E can be maintained, and the same effect as that of the clasp 1 of the first embodiment can be obtained. In addition, the lock member 71E has a simple shape including only the main body portion 711E and the restriction portion 713E, and the push button 64E has a simple shape without a storage groove, and thus the manufacturing cost of each of the components can be reduced.

Modification Example

The present disclosure is not limited to the above-described embodiments, and modifications, improvements, and the like within the scope of achieving the object of the present disclosure are included in the present disclosure. The configurations of the engagement member and the engaged portion are not limited to the configurations of the embodiments. For example, a configuration may be adopted in which an engagement member moves in the X axis direction and engages with an engaged portion. That is, the engaged portion is constituted by forming a claw portion protruding in the X2 direction and an engagement groove opened in the X2 direction on a middle plate 20. In addition, the engagement member is provided which is biased on the X1 direction side and abuts on a push button on the inclined surface to move on the X2 direction side when the push button is pressed. Even in such a configuration, the same effect as that of each of the embodiments can be obtained by providing the lock member that can restrict the push operation of the push button. In addition, the operation member is not limited to the pair of push buttons, and may be one button, may be only a lever, a rotary knob, or the like, and may be a member that can move an engagement member such as a slide plate 62 by an operation such as a push operation, a slide operation, or a rotation operation. A biasing unit is not limited to the coil spring 63 separated from the slide plate 62, and various spring members such as a torsion spring can be used. Furthermore, a spring portion may be formed integrally with an engagement member such as the slide plate 62 and the engagement member also may be served as a biasing member.

In the first embodiment, the first recessed groove portion 623 and the second recessed groove portion 624 are formed in the slide plate 62, but the first recessed groove portion and the second recessed groove portion may be formed in the push button 64. In this case, a configuration may be adopted in which the dimension of the second recessed groove portion in the Y axis direction is longer than that of the first recessed groove portion 623 and the second recessed groove portion also serves as the storage groove. In another embodiment, a first recessed groove portion or a second recessed groove portion may be formed in the button side. In addition, the configuration in which the lock member is held at the operation restriction position or the operation permission position is not limited to the configuration in which the restriction portion that restricts the movement of the push button is engaged with the first recessed groove portion or the second recessed groove portion. For example, the lock member may be configured to be held at the operation restriction position or the operation permission position by forming a projection portion that is elastically deformable in a guide frame that guides the lock member in the sliding direction and forming a recessed portion on the lock member side. In addition, the lock member 71 and the movement operation member 72 are not limited to being coupled to each other with the fixing screw 73, and may be coupled to each other by bonding, welding, or the like. That is, the lock mechanism is not limited to the configuration of the above-described embodiments, and may be a member that can switch between the restriction and the permission of the operation of the operation member such as the push button 64. The clasp 1 is not limited to the timepiece band, and can also be used as a band for an ornament such as a bracelet or a necklace.

Summary of Present Disclosure

The present disclosure provides a clasp that couples a first band and a second band, the clasp including a coupling member coupled to a first band side and including an engaged portion, and a clasp main body coupled to a second band side, in which the clasp main body includes an engagement member configured to move to an engagement position where the engagement member is configured to engage with the engaged portion and a release position where the engagement member is configured to release an engagement with the engaged portion, an operation member that moves the engagement member from the engagement position to the release position, and a lock member configured to move to an operation restriction position where an operation of the operation member is restricted and an operation permission position where the operation of the operation member is permitted, regardless of whether the lock member is in the operation restriction position or the operation permission position, the engagement member is configured to be engaged with the engaged portion without operating the operation member in a state where the engagement member is not engaged with the engaged portion, and the engagement is released by moving the engagement member to the release position by the operation member in a state where the engagement member is engaged with the engaged portion, and when the lock member is moved to the operation restriction position, the engagement member is restricted from being moved to the release position by the operation member. According to the present disclosure, by moving the lock member to the operation restriction position, the movement of the engagement member to the release position is restricted, and the engagement state between the engagement member and the engaged portion can be maintained even when an unintended external force is applied to the operation member. Therefore, by moving the lock member to the operation restriction position, it is possible to prevent the clasp from being removed during the diving or the like. In addition, in a state where the engagement member and the operation member are separate, the lock member only restricts the operation of the operation member, and the engagement member is not engaged with the engaged portion, the engagement member can be engaged with the engaged portion without operating the operation member. Therefore, even when the lock member is erroneously moved to the operation restriction position in a state where the engagement of the clasp is released, that is, in a state where the engagement member is not engaged with the engaged portion, the engagement member can be engaged with the engaged portion. Therefore, it is possible to prevent the state in which the clasp does not close or the clasp from being damaged when trying to forcibly close the clasp.

In the present disclosure, the clasp main body may include a biasing member that biases the engagement member to an engagement position side, and at least one of the engaged portion and the engagement member may have a guide surface that moves the engagement member from the engagement position to the release position against a biasing force of the biasing member when the engagement member abuts on the engaged portion. In the present disclosure, when the engagement member abuts on the engaged portion, the engagement member can be moved from the engagement position to the release position against the biasing force of the biasing member. Therefore, from the state where the clasp is opened, the clasp can be easily closed only by abutting the coupling member and the clasp main body on each other.

In the clasp of the present disclosure, the lock member may include a positioning portion, the engagement member may include a holding portion with which the positioning portion is engaged, and the lock member may be held at the operation restriction position by the positioning portion being engaged with the holding portion. In the present disclosure, the positioning portion of the lock member is engaged with the holding portion of the engagement member, and thus the lock member can be held at the operation restriction position. Therefore, it is possible to prevent the lock member from moving to the operation permission position without operating by the user, and it is possible to reliably maintain the operation restriction state. In addition, when the lock member is moved to the operation restriction position, the positioning portion is engaged with the holding portion, and thus the user receives a click feeling, and can easily recognize that the lock member is moved to the operation restriction position.

In the clasp of the present disclosure, the lock member may include a movement operation member operated by a user, and the movement operation member may include a logo display portion on which a logo is displayed. In the present disclosure, the logo can be displayed on the movement operation member operated by the user in the lock member, and thus the brand power and the like can be enhanced.

In the clasp of the present disclosure, the lock member may be moved in a coupling direction in which the clasp main body and the first band are coupled. In the present disclosure, the lock member is slid and moved in the coupling direction of the clasp main body and the first band, that is, in the longitudinal direction of the first band and the second band. Therefore, the lock member can be easily moved to both the operation restriction position and the operation permission position.

In the clasp of the present disclosure, the engagement member may include a pair of slide plates disposed to sandwich the engaged portion, the operation member may include a pair of push buttons that abuts on the slide plates, the slide plate may include a main body portion that abuts on the push button, an engagement portion disposed to sandwich the engaged portion, and a coupling portion that couples the main body portion and the engagement portion, the engagement portion of one slide plate may be disposed between the main body portion and the engagement portion of another slide plate, a coil spring that biases the slide plates in a direction in which the slide plates are separated from each other and brings the engagement portions closer to each other may be disposed between the pair of slide plates, and the lock member may include a restriction portion disposed between the main body portion of the slide plate and the push button to restrict a push operation of the push button when the lock member moves to the operation restriction position. In the present disclosure, the pair of slide plates is biased in a direction in which the pair of slide plates is separated from each other by the coil spring, and the main body portion of the slide plate abuts on the pair of push buttons. Therefore, the pair of push buttons can also be biased in a direction in which the pair of push buttons is separated from each other by the coil spring. Therefore, it is not necessary to separately provide a spring or the like for biasing the push button to the outside, and the number of components can be reduced. In addition, since the lock member can restrict the push operation of the push button by providing the restriction portion disposed between the slide plate and the push button, the structure of the lock member can be simplified and the cost can be reduced.

In the clasp of the present disclosure, the main body portion of the slide plate may include a first recessed groove portion that holds the restriction portion at the operation restriction position and a second recessed groove portion that holds the restriction portion at the operation permission position, and in the push button, a storage groove in which the restriction portion is stored may be formed at a position facing the second recessed groove portion when the push button is pushed in a state where the restriction portion is disposed in the second recessed groove portion. In the present disclosure, since the slide plate is biased by the coil spring to the restriction portion side of the push button and the lock member, the first recessed groove portion or the second recessed groove portion can be pressed against the restriction portion by the biasing force of the coil spring. Therefore, the position of the restriction portion, that is, the lock member can be held at the operation permission position or the operation restriction position by using the biasing force of the coil spring. In addition, when the lock member is moved to move the restriction portion between the first recessed groove portion and the second recessed groove portion, the slide plate is pushed by the restriction portion against the biasing force of the coil spring until the restriction portion is removed from one of the recessed groove portions and is held at the other recessed groove portion. As a result, a click feeling can be obtained in the movement operation of the lock member. Since the functions of holding the positions of the restriction portions and generating a click feeling in the movement operation can be realized by the coil spring and each of the recessed groove portions, the functions can be realized with a simple structure, and the durability can be improved without reducing the operability.

A timepiece of the present disclosure includes the above-described clasp, the first band, and the second band that are coupled to the clasp. In the timepiece of the present disclosure, even when the lock member is erroneously moved to the operation restriction position, the engagement member can be engaged with the engaged portion. Therefore, the timepiece having the clasp of the present disclosure can be reliably worn on the arm.