Clasp and timepiece

Abstract

To provide a clasp and a timepiece that allow an engaged portion and an engagement member can be engaged even when a lock member is moved to a position where an operation of an operation member is restricted in a state where the engagement of the clasp is released.SOLUTION: A clasp comprises: a coupling member coupled to a first band side and including an engaged portion; and a clasp body coupled to a second band side. The clasp body includes: an engagement member capable of moving to an engagement position and a release position; an operation member that moves the engagement member from the engagement position to the release position; and a lock member capable of moving to an operation restriction position and an operation permission position. The engagement member can 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. 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.SELECTED DRAWING: Figure 8

Description

[Technical Field]

[0001] The present invention relates to a clasp used for a band such as a watch band or a band for an ornament, and to a timepiece equipped with such a clasp. [Background technology]

[0002] Patent Document 1 discloses a push clasp that can restrict the push of the push button by moving a locking member, in which the engagement between the engagement part of the push button and the engagement pin on the watch face can be released by pushing the push button. By restricting the push of the push button by moving the locking member, this push clasp can prevent the clasp from being released by an unintentional push while diving, which could cause the watch to fall off. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 9-56425 Summary of the Invention [Problem to be solved by the invention]

[0004] The push clasp in Patent Document 1 has the problem that if the locking member is mistakenly moved to a position that restricts push operation while the clasp is disengaged, the engagement portion of the push button cannot be engaged with the engagement pin on the top plate, and the locking member must be operated again. [Means for solving the problem]

[0005] The clasp disclosed herein is a clasp that connects a first band and a second band, and includes a connecting member connected to the first band side and having an engaged portion, and a clasp main body connected to the second band side. The clasp main body is equipped with an engaging member that is movable to an engaging position where it can engage with the engaged portion and to a releasing position where it can disengage from the engaged portion, an operating member that moves the engaging member from the engaging position to the releasing position, and a locking member that is movable to an operation restricting position that restricts operation of the operating member and to an operation allowing position that permits operation of the operating member. When the engaging member is not engaged with the engaged portion, the engaging member can be engaged with the engaged portion without operating the operating member, and when the engaging member is engaged with the engaged portion, the engagement is released by moving the engaging member to the releasing position with the operating member, and when the locking member is moved to the operation restricting position, the operating member restricts movement of the engaging member to the releasing position.

[0006] The timepiece of the present disclosure is characterized by comprising a clasp, and the first band and the second band connected to the clasp. [Brief explanation of the drawings]

[0007] [Figure 1] FIG. 1 is a front view showing a wristwatch according to a first embodiment. [Figure 2] FIG. 2 is a perspective view showing the clasp of the first embodiment with the folding member in an open state. [Figure 3] FIG. 2 is an exploded perspective view of the clasp of the first embodiment. [Figure 4] FIG. 2 is an exploded perspective view of an engagement unit and a locking mechanism according to the first embodiment. [Figure 5] FIG. 2 is a plan view showing an operation permitted state of the clasp main body of the first embodiment. [Figure 6] FIG. 2 is a cross-sectional view showing an operation permitted state of the clasp body of the first embodiment. [Figure 7] FIG. 2 is a plan view showing a push operation state of the clasp main body of the first embodiment. [Figure 8]FIG. 2 is a plan view showing an operation-restricted state of the clasp main body of the first embodiment. [Figure 9] FIG. 2 is a cross-sectional view showing an operation-restricted state of the clasp main body of the first embodiment. [Figure 10] FIG. 10 is a cross-sectional view showing a main part of a clasp body according to a second embodiment. [Figure 11] FIG. 10 is a plan view showing the operation restricted state of the clasp main body of the second embodiment. [Figure 12] FIG. 10 is a cross-sectional view showing an operation permitted state of the clasp body of the second embodiment. [Figure 13] FIG. 10 is a cross-sectional view showing a main part of a clasp body according to a third embodiment. [Figure 14] FIG. 11 is a plan view showing the operation restricted state of the clasp main body of the third embodiment. [Figure 15] FIG. 10 is a cross-sectional view showing an operation permitted state of the clasp body of the third embodiment. [Figure 16] FIG. 10 is a cross-sectional view showing a main part of a clasp body according to a fourth embodiment. [Figure 17] FIG. 11 is a plan view showing the operation restricted state of the clasp main body of the fourth embodiment. [Figure 18] FIG. 10 is a cross-sectional view showing an operation permitted state of the clasp body of the fourth embodiment. [Figure 19] FIG. 11 is a cross-sectional view showing a state in which the operation of the clasp main body of the fifth embodiment is restricted. [Figure 20] FIG. 11 is a cross-sectional view showing an operation permitted state of the clasp body of the fifth embodiment. [Figure 21] FIG. 11 is a plan view showing a main part of a clasp body according to a fifth embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0008] [First embodiment] A first embodiment of the present disclosure will be described below with reference to the drawings. As shown in Fig. 1, a wristwatch 100 as a timepiece includes an exterior case 10, a first band 11, and a second band 12. Lugs 10A are integrally provided at the 6 o'clock and 12 o'clock positions of the exterior case 10. The first band 11 is connected to the lug 10A at the 6 o'clock position using an attachment pin, and the second band 12 is connected to the lug 10A at the 12 o'clock position using an attachment pin. The first band 11 and the second band 12 are configured by connecting a plurality of band pieces 9 with pins (not shown). The open ends of the first band 11 and the second band 12 are fastened together by a clasp 1 shown in FIGS.

[0009] FIG. 2 is a perspective view of the clasp 1 with the folding member 2 open, and FIG. 3 is an exploded perspective view of the clasp 1. As shown in FIG. In the following description, the X-axis is the axis along the longitudinal direction of the first band 11 and the second band 12. The Y-axis is the axis along the width direction of the first band 11 and the second band 12 and is perpendicular to the X-axis. The Z-axis is the axis perpendicular to the X-axis and the Y-axis. On the X-axis, the direction from the clasp body 4 toward the first band 11 is the X1 direction, and the direction from the clasp body 4 toward the second band 12 is the X2 direction. One direction of the Y-axis is the Y1 direction, and the other direction is the Y2 direction. On the Z-axis, the direction in which the clasp cover 40 moves away from the folding member 2 is the Z1 direction, and the direction in which the clasp cover 40 moves toward the folding member 2 is the Z2 direction. The Z1 direction side of the clasp body 4 may be referred to as the front side of the clasp 1, the Z2 direction side as the back side of the clasp 1, the Y1 direction side as the left side, and the Y2 direction side as the right side.

[0010] As shown in FIG. 2, the clasp 1 includes a folding member 2 and a clasp body 4. The bending member 2 includes a middle plate 20 and an outer plate 30. The middle plate 20 is an elongated member extending along the X-axis direction, which is the longitudinal direction of the first band 11, and its end on the X1 side is rotatably connected to the first band 11 by a connecting pin 13. The end on the X2 side of the middle plate 20 is rotatably connected to one end of the outer plate 30 by a connecting pin 14. The middle plate 20 is also provided with a lock pin 21 that protrudes from the front surface and serves as an engaged portion. Therefore, the middle plate 20 is a connecting member that is connected to the first band 11 and has an engaged portion. The lock pin 21 also has a shaft 22 that protrudes from the middle plate 20 and a cap 23 that is provided at the tip of the shaft 22. The outer plate 30 includes a shaft 31 that is rotatably connected to the clasp body 4, and a pair of outer plate arms 32 that extend along the X-axis direction from both ends of the shaft 31 in the Y-axis direction and are disposed on the left and right sides of the middle plate 20. As described above, the tips of the outer plate arms 32 are rotatably connected to the ends of the middle plate 20 by the connecting pins 14. Therefore, when the folding member 2 is folded, the outer plate arms 32 are disposed on the left and right sides of the middle plate 20, the front and back surfaces of the middle plate 20 and the outer plate 30 are positioned approximately on the same plane, and the lock pin 21 is configured to protrude from the surfaces of the middle plate 20 and the outer plate 30.

[0011] [Configuration of the clasp body] As shown in FIG. 3, the clasp body 4 includes a clasp cover 40, a clasp frame portion 50, a clasp connecting portion 55, an engagement unit 60, and a locking mechanism 70.

[0012] [Clasp cover configuration] As shown in Figure 3, the clasp cover 40 has a plate-shaped surface portion 41 that is curved in an arc along the X-axis direction, and a pair of side wall portions 42 that protrude from the outer edge of the surface portion 41 in the Y-axis direction when viewed from the front side to the back side. A pair of continuous protrusions 411 are formed on the surface portion 41 at a predetermined interval in the Y-axis direction along the X-axis direction, which is the longitudinal direction of the clasp cover 40. In addition, an elongated hole 412 is formed between the protrusions 411 on the surface portion 41 and along the X-axis direction.

[0013] Each side wall 42 has an elongated hole 421 formed along the X-axis direction. Each push button 64, which will be described later, is disposed in the elongated hole 421. Each side wall 42 also has through holes 422, 423 formed therein, into which screws 46 for fixing the clasp cover 40 to the clasp frame 50 are inserted.

[0014] [Configuration of the clasp frame] As shown in Fig. 3, the clasp frame portion 50 is configured with a pair of frames 51 connected to the shaft portion 31 of the outer panel 30 by connecting pins 15 (see Fig. 6). Each frame 51 is fixed to each side wall portion 42 of the clasp cover 40 by screws 46. Each frame 51 is formed with a guide groove portion 511 that allows the connecting position with the clasp connecting portion 55 to be changed in multiple stages.

[0015] [Configuration of the clasp connection part] The clasp connecting portion 55 is connected to the second band 12 and includes a retaining unit 57 that holds an engaging pin 56 that engages with the guide groove 511. The engaging pin 56 is disposed between the clasp cover 40 and the clasp frame portion 50. A built-in spring biases the retaining unit 57 toward the clasp frame portion 50 relative to the clasp cover 40, causing the engaging pin 56 to engage with the guide groove 511. By pressing the retaining unit 57 toward the clasp cover 40 from the back side, the engaging pin 56 can be moved to another guide groove 511, allowing the clasp cover 40 and the clasp frame portion 50 to slide relative to the second band 12 in multiple stages.

[0016] [Configuration of engagement unit] As shown in FIG. 4, the engagement unit 60 includes a guide frame 61, a pair of slide plates 62 serving as engagement members, a pair of coil springs 63 serving as biasing members, and a pair of push buttons 64 serving as operating members. The guide frame 61 includes 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 has an insertion hole 6111 through which the lock pin 21 is inserted. The side surface portions 612, 613 are formed to protrude from the outer edges in the X1 and X2 directions of the bottom surface portion 611 toward the surface side. The distance between the side surface portions 612, 613 in the X axis direction is dimensioned to match the width dimension of the slide plate 62. A rectangular recessed groove 6121 is formed in the center position in the Y axis direction of the side surface portion 612, in which a locking member 71, which will be described later, is disposed. The guide portions 614 protrude from the side surface portion 612 in the X2 direction, and are formed as a pair on each side of the recessed groove 6121. The guide portions 614 are formed in a substantially quarter-circle shape in plan view, and are shaped to fit the locking member 71. The guide portion 615 protrudes in the X1 direction from the side surface portion 613 and is formed continuously along the Y axis. Therefore, the length dimension of the guide portion 615 in the Y axis direction is set to a length dimension that reaches from one guide portion 614 to the other guide portion 614. The bottom surface portion 611 and the guide portions 614, 615 are spaced apart 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, 615, the slide plates 62 are arranged to be movable only in the Y-axis direction. The distance between guide portion 614 and guide portion 615 in the X-axis direction is set to a dimension that allows lock member 71, which will be described later, to move between the operation restricting position and the operation permitting position.

[0017] [Slide plate configuration] 4, each slide plate 62 includes a main body portion 620, an engaging portion 621, and a connecting portion 622 that connects the main body portion 620 and the engaging portion 621. The engaging portion 621 of one slide plate 62 is disposed between the engaging portion 621 of the other slide plate 62 and the main body portion 620. Similarly, the engaging portion 621 of the other slide plate 62 is disposed between the engaging portion 621 of the one slide plate 62 and the main body portion 620. For this reason, the engaging portions 621 are disposed opposite each other, and when the slide plates 62 move closer to each other, the engaging portions 621 move in directions separating them, and when the slide plates 62 move in directions separating them, the engaging portions 621 move in directions approaching each other. For this reason, the pair of slide plates 62, which are engaging members, are configured to be movable between an engaging position where the pair of engaging portions 621 approach each other and can engage with the lock pin 21, which is the engaged portion, and a releasing position where the pair of engaging portions 621 move away from each other and can release the engagement with the lock pin 21, which is the engaged portion. 5, a first groove 623 that holds the locking member 71 in the operation restricted position and a second groove 624 that holds the locking member 71 in the operation permitted position are formed on the end surface in the Y-axis direction of the main body 620. The first groove 623 and the second groove 624 are partitioned by a protrusion 625. 6, inclined surfaces 626 are formed on the opposing surfaces of the engaging portions 621, which are inclined in directions that move away from each other as they move from the front surface side to the back surface side. The inclined surfaces 626 are formed continuously from the middle position in the Z-axis direction of the opposing surfaces of the engaging portions 621 to the lower ends in the Z2 direction. Therefore, each engaging portion 621 has a claw shape in which the thickness dimension in the Z-axis direction decreases as it moves toward the opposing engaging portion 621.

[0018] As shown in Fig. 4, the coil spring 63, which is a biasing member, is disposed between the main body portion 620 and the connecting portion 622, and biases the pair of slide plates 62 in directions separating them from each other in the Y-axis direction. When the slide plates 62 move in directions separating them from each other, the engagement portions 621 move in directions approaching each other. At this time, if the shaft portion 22 of the lock pin 21 is disposed between the engagement portions 621, the distance between the engagement portions 621 becomes smaller than the umbrella portion 23, preventing them from coming off, and therefore each engagement portion 621 is capable of engaging with the lock pin 21, which is the engaged portion.

[0019] The pair of push buttons 64 are operating members that move the pair of slide plates 62, which are engaging members, from an engaged position to a released position. The push button 64 includes a button body 641 and a flange 642 formed on the end surface of the button body 641. The button body 641 is inserted into the elongated hole 421 in the side wall portion 42 from the inside of the clasp cover 40, and the flange 642 is engaged with the side wall portion 42, preventing the push button 64 from slipping outward. In addition, a storage groove 643 is formed along the Z-axis direction on the end surface of the button body 641 on which the flange 642 is formed. The storage groove 643 is formed in a position facing the second recessed groove portion 624 of the slide plate 62 in the Y-axis direction. The end face of each push button 64, on which the flange portion 642 is formed, abuts against the slide plate 62, and the slide plates 62 are urged in a direction away from each other by the coil spring 63, so that each push button 64 is also urged in a direction away from each other in the Y-axis direction, with the flange portion 642 abutting against the inner surface of the side wall portion 42 and the button body 641 protruding outside the side wall portion 42 from the elongated hole 421. Furthermore, when the button bodies 641 of the push buttons 64 are pressed by the user and move closer to each other, the slide plates 62 move closer to each other in the Y-axis direction, and the engagement portions 621 move away from each other. At this time, if the engagement portions 621 are engaged with the lock pin 21, the distance between the engagement portions 621 becomes larger than the diameter of the umbrella portion 23 of the lock pin 21, and the engagement with the lock pin 21 can be released. Furthermore, since an inclined surface 626 is formed on the engaging portion 621 of the slide plate 62, when the umbrella portion 23 of the lock pin 21 abuts against the inclined surface 626 from the back side of the engaging portion 621, the umbrella portion 23 pushes the inclined surface 626 outward. As a result, the slide plates 62 move in directions toward each other against the biasing force of the coil spring 63, and the engaging portions 621 move in directions away from each other. Then, when the umbrella portion 23 overcomes the engaging portion 621, the slide plates 62 are biased by the coil spring 63 in directions away from each other, and the engaging portions 621 move toward each other and engage with the shaft portion 22 of the lock pin 21.

[0020] [Locking mechanism configuration] The locking mechanism 70 switches between an operation restricted state that restricts the pushing operation of the push button 64, which is an operating member, and an operation permitted state that permits the pushing operation. As shown in Figure 4, the locking mechanism 70 includes a locking member 71, a movement operating member 72 that moves the locking member 71, and a fixing screw 73 that fixes the movement operating member 72 to the locking member 71.

[0021] The locking member 71 includes 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 the Y1 direction and the Y2 direction, respectively, and a pair of round-shaft-shaped restricting portions 713 protruding in the Z2 direction from the tip of each extension portion 712. Therefore, when the main body portion 711 and the extension portions 712 are disposed on the front surface side of the slide plate 62, i.e., on the Z1 direction side, the restricting portions 713 protruding in the Z2 direction further than the main body portion 711 and the extension portions 712 are able to engage with the first recessed groove portion 623 and the second recessed groove portion 624. A through-hole 714 penetrating in the Z-axis direction and a groove 715 opening on the X2-direction side are formed in the main body 711. The formation of the groove 715 prevents the locking member 71 from interfering with the umbrella portion 23 of the lock pin 21.

[0022] The movable operating member 72 comprises an operating plate 721 that is arranged between the protrusion portions 411 of the clasp cover 40 and that is slid by the user in the X-axis direction, and a fixed shaft portion 722 that protrudes from the underside of the operating plate 721 and is inserted into the elongated hole 412 of the clasp cover 40 and the through hole 714 of the locking member 71. A logo display section 7211 that displays a logo is provided on the operation panel 721. The logo displayed on the logo display section 7211 includes at least one of letters, numbers, symbols, and figures, and represents the brand or manufacturer of the watch.

[0023] As shown in Fig. 6, two protrusions 723 are formed on the underside of the operation plate 721 along the X-axis direction. These protrusions 723 reduce the contact area between the operation plate 721 and the surface portion 41, allowing the operation plate 721 to slide smoothly. However, contact between the protrusions 723 and the surface portion 41 may scratch the surface portion 41. For this reason, in this embodiment, the length of the protrusions 723 in the X-axis direction is made shorter than that of the operation plate 721, so that the area where the protrusions 723 come into contact with the surface portion 41 when the operation plate 721 slides is always covered by the operation plate 721. Therefore, even if the surface portion 41 is scratched, the scratch will not be exposed on the surface side of the clasp body 4. The fixing screw 73 is threaded onto a fixed shaft portion 722 inserted into the through-hole 714 with the locking member 71 sandwiched therebetween, and fixes the movement operation member 72 to the locking member 71. Therefore, the locking member 71 and the movement operation member 72 move together in the X-axis direction. As shown in Figure 6, a recess 716 is formed on the back surface of the locking member 71 to accommodate the head of the fixing screw 73. When the movement operation member 72 is slid to move the lock member 71 in the X-axis direction and the restriction portion 713 moves between the first groove portion 623 and the second groove portion 624, the restriction portion 713 presses the protrusion 625 to move the slide plates 62 in directions toward each other, allowing the restriction portion 713 to move over the protrusion 625. When the restriction portion 713 moves over the protrusion 625 and into the first groove portion 623 or the second groove portion 624, the slide plates 62 move in directions away from each other due to the biasing force of the coil spring 63, and the first groove portion 623 or the second groove portion 624 abuts against the restriction portion 713. Therefore, when the user slides the movement operation member 72, a clicking sensation is transmitted when the restriction portion 713 moves over the protrusion 625, and the user can recognize that the lock member 71 has been moved to the operation restricted position or the operation permitted position. Furthermore, because the slide plate 62 is biased by the coil spring 63 in directions separating from each other, the first groove portion 623 or the second groove portion 624 of the slide plate 62 is pressed against the restricting portion 713 of the locking member 71. Therefore, unless the user operates the sliding movement operation member 72, the locking member 71 is maintained in either the operation restricting position where the restricting portion 713 is arranged in the first groove portion 623 or the operation allowing position where the restricting portion 713 is arranged in the second groove portion 624. In other words, the restricting portion 713 of the locking member 71 is engaged with the first groove portion 623, thereby holding the locking member 71 in the operation restricting position. Therefore, the restricting portion 713 constitutes a positioning portion, and the first groove portion 623 constitutes a holding portion.

[0024] Next, the operation permitted state and operation restricted state of the push button 64 by the lock mechanism 70 will be described with reference to FIGS. [Operation Permission Status] The operation permitted state is a state in which the moving operation member 72 is moved in the X1 direction. In the operation permitted state, as shown in FIGS. 5 and 6, the locking member 71 is moved in the X1 direction, and the restricting portion 713 is positioned in the second recessed groove portion 624 of the slide plate 62. Even in the operation permitted state shown in FIG. 5, the slide plates 62 are biased by the coil springs 63 in directions away from each other, and the engagement portions 621 are moved in directions toward each other and engaged with the lock pins 21. In addition, the slide plates 62 are in contact with the push buttons 64, and the push buttons 64 are biased to a state in which the flange portions 642 are in contact with the side wall portions 42.

[0025] In the operation permitted state, the restricting portion 713 is positioned opposite the storage groove 643 of the push button 64. Therefore, as shown in FIG. 7 , when a user pushes the push button 64, the restricting portion 713 is stored in the storage groove 643, allowing the push button 64 to be pressed in. As a result, the pair of slide plates 62 move toward each other to the release position. As a result, the distance between the engagement portions 621 becomes larger than the umbrella portion 23 of the lock pin 21, allowing the slide plates 62 to be released from their engagement with the lock pin 21. Note that in this embodiment, the release position of the slide plate 62 is a position where one engagement portion 621 abuts against the other main body portion 620, and the restricting portion 713 abuts against the bottom of the storage groove 643. Therefore, the user can reliably move the slide plate 62 to the release position by pushing the push button 64 until it can no longer move.

[0026] [Operation restriction status] The state in which the moving operation member 72 is moved in the X2 direction is the operation restricted state. In the operation restricted state, as shown in Figures 8 and 9, the locking member 71 is moved in the X2 direction, and the restricting portion 713 is held in the first recessed groove portion 623 of the slide plate 62. Even in the operation restricted state shown in Figure 8, the slide plates 62 are biased by the coil springs 63 in directions moving away from each other, and the engaging portions 621 are moved in directions moving toward each other and engaged with the lock pins 21.

[0027] In the operation restricted state, the restricting portion 713 is positioned so as not to face the storage groove 643 of the push button 64, and therefore, even if the user performs a push operation to press the push button 64, the push button 64 abuts against the restricting portion 713 and is restricted from moving. As a result, the operation of the push button 64 is restricted, the slide plate 62 is maintained in a spaced-apart state by the coil spring 63, and the engagement state between the lock pin 21 and the engagement portion 621 is also maintained.

[0028] Next, a method for wearing the wristwatch 100 on the user's wrist will be described. In the operation restricted state shown in FIG. 8, the locking member 71 restricts the push operation of the push button 64, but does not restrict the pair of slide plates 62 from moving in the direction toward each other. Therefore, as shown in Figure 2, when the middle plate 20 and outer plate 30 of the bending member 2 are open and the locking member 71 is in the operation permitting position, i.e., the restricting portion 713 is positioned in the second groove portion 624, not only when the locking member 71 is in the operation restricting position, i.e., the restricting portion 713 is positioned in the first groove portion 623, by closing the middle plate 20 and outer plate 30 and pressing the sliding plate 62 of the clasp body 4 against the locking pin 21, the sliding plate 62 can engage with the locking pin 21 and the wristwatch 100 can be fastened without having to push the push button 64. That is, the upper end of the lock pin 21 is formed as a truncated cone-shaped umbrella portion 23, and the diameter of the upper base of the umbrella portion 23 is smaller than the diameter of the lower base of the umbrella portion 23. Furthermore, the lower sides of the opposing surfaces of the pair of engaging portions 621 are formed as inclined surfaces 626 that are inclined in directions away from each other. The dimension between the lower ends of each inclined surface 626 is larger than the diameter of the upper base 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 base of the umbrella portion 23. Therefore, when the bending member 2 is closed and the umbrella portion 23 is inserted between the engaging portions 621, the side surfaces of the umbrella portion 23 abut against the inclined surfaces 626, pushing the pair of engaging portions 621, i.e., the pair of slide plates 62, apart against the biasing force of the coil spring 63. Therefore, the side surface of the umbrella portion 23 of the lock pin 21, which is the engaged portion, and the inclined surface 626 of the slide plate 62, which is the engaging member, are guide surfaces that move the slide plate 62 from the engaged position to the released position against the biasing force of the coil spring 63 when the engaging portion 621 of the slide plate 62 is abutted against the lock pin 21. Furthermore, when clasp body 4 is pushed toward middle plate 20, umbrella portions 23 of lock pin 21 disengage from the opposing surfaces of engagement portions 621, and shank 22 is positioned between engagement portions 621. As a result, engagement portions 621, which had been pushed apart by umbrella portions 23, move toward each other due to the biasing force of coil spring 63. As a result, each engagement portion 621 abuts and engages with shank 22 of lock pin 21. In this way, wristwatch 100 can be worn on the wrist.

[0029] Next, we will explain how to lock wristwatch 100 to prevent it from coming off the wrist when diving, etc. If locking member 71 is in the operation permitted position when wristwatch 100 is worn on the wrist, simply move movement operating member 72 in the X2 direction to the operation restricted position where restricting portion 713 of locking member 71 is held in first groove portion 623. If locking member 71 is already in the operation restricted position when wristwatch 100 is worn on the wrist, then simply maintain that state. When the locking member 71 is in the operation restriction position, even if an unintended external force is applied to the push button 64, the restriction part 713 of the locking member 71 restricts the push button 64 from being pressed in, thereby preventing the engagement between the locking pin 21 and the slide plate 62 from being released.

[0030] Next, how to remove the wristwatch 100 from the wrist will be described. When removing wristwatch 100, if locking member 71 is in the operation restricted position, moving operating member 72 is moved in the X1 direction to move locking member 71 to the operation permitted position. This allows restricting portion 713 of locking member 71 to move into second groove portion 624, enabling push button 64 to be operated. Then, with locking member 71 in the operation permission position, push buttons 64 are pressed to move engagement portions 621 away from each other, disengaging locking pin 21 from slide plate 62, and opening folded middle plate 20 and outer plate 30. This causes umbrella portion 23 of locking pin 21 to pass between engagement portions 621 and be pulled out of insertion hole 6111 of guide frame 61. In this way, wristwatch 100 can be removed from the wrist.

[0031] [Effects of the first embodiment] According to the clasp 1 of the first embodiment, by moving the locking member 71 to the operation restricting position, the pushing operation of the push button 64 is restricted and the sliding plate 62 cannot be moved to the release position, so that even if an unintended external force is applied to the push button 64, the engagement between the sliding plate 62 and the locking pin 21 can be maintained. Therefore, by moving the locking member 71 to the operation restricting position, it is possible to reliably prevent the clasp 1 from coming off while diving, for example. Furthermore, because the sliding plate 62 and the push button 64 are constructed separately and the locking member 71 is structured to restrict only the pushing operation of the push button 64, when the sliding plate 62 is not engaged with the locking pin 21, the sliding plate 62 can be engaged with the locking pin 21 without operating the push button 64. Therefore, even if the locking member 71 is mistakenly moved to the operation restricting position when the clasp 1 is open, that is, when the folding member 2 is open and the sliding plate 62 is not engaged with the locking pin 21, the sliding plate 62 can be moved to engage with the locking pin 21. Therefore, the clasp 1 will not become unable to close or will not be damaged by trying to close it forcibly, and wristwatch 100 with clasp 1 can be worn securely on the wrist.

[0032] With locking member 71 in the operation permitted position, clasp 1 can be opened by operating push button 64. Therefore, in everyday use, there is no reduction in operability when putting on or taking off wristwatch 100, and it can be used in the same way as a regular clasp that does not have locking mechanism 70.

[0033] Because the slide plate 62 is brought into contact with the push button 64 by the coil spring 63, there is no need to provide a separate spring to bias the push button 64, which is separate from the slide plate 62, which reduces the number of parts and reduces costs. Furthermore, because the pushing operation of the push button 64 can be restricted simply by arranging the restricting portion 713 of the locking member 71 between the slide plate 62 and the push button 64, there is no need to employ a complex structure, which also reduces costs. Furthermore, when restricting portion 713 of locking member 71 is placed in first groove portion 623 or second groove portion 624, sliding plate 62 is urged toward restricting portion 713 by coil spring 63, so first groove portion 623 or second groove portion 624 can be brought into contact with restricting portion 713. As a result, restricting portion 713 can be securely held in first groove portion 623 or second groove portion 624, and locking member 71 can be held in the operation restricting position or the operation permitting position even if the arm wearing wristwatch 100 moves. Furthermore, when the movement operation member 72 is operated to move the restricting portion 713 of the locking member 71 between the first groove portion 623 and the second groove portion 624, the restricting portion 713 abuts against the protrusion 625 and pushes the sliding plate 62 against the biasing force of the coil spring 63. This creates resistance when the movement operation member 72 is operated. After the locking member 71 is slid, the restricting portion 713 abuts against the first groove portion 623 or the second groove portion 624, eliminating the resistance during sliding, thereby fixing the position of the sliding plate 62 and providing a clicking sensation during operation. Furthermore, because these functions utilize the biasing force of the coil spring 63, the resistance during sliding movement is small, preventing a decrease in the operability of the movement operation member 72 and increasing the durability of the locking member 71 when it is repeatedly moved.

[0034] The locking member 71 is disposed between the surface portion 41 of the clasp cover 40 and the engaging unit 60, and the locking member 71 and the engaging unit 60 are disposed so as to overlap in the Z-axis direction. This allows the length dimension of the clasp body 4 in the X-axis direction to be shorter than when the locking member is disposed to the side of the engaging unit 60, i.e., in the X-axis direction. Furthermore, the groove 715 formed in the locking member 71 prevents interference with the lock pin 21, eliminating the need to displace the locking member 71 in the X-axis direction relative to the lock pin 21, which also allows the length dimension of the clasp body 4 in the X-axis direction to be shorter. Furthermore, the height position of the locking member 71 in the Z-axis direction does not need to be higher than the umbrella portion 23 of the lock pin 21, allowing the thickness dimension of the clasp body 4 to be smaller.

[0035] Because the locking member 71 and the movement operating member 72 are connected by the fixing screw 73 via the elongated hole 412 in the clasp cover 40, the width dimension of the movement operating member 72 in the Y-axis direction can be made smaller than that of the locking member 71, and the movement operating member 72 can be positioned in the center of the width direction on the surface portion 41 of the clasp cover 40, hiding the elongated hole 412. This improves the appearance of the clasp 1. The movement operation member 72 is provided with a logo display portion 7211, which allows the logo of the brand or manufacturer to be displayed, emphasizing the brand name or manufacturer name and further improving the appearance of the clasp 1. Furthermore, the movement operation member 72 is connected to the locking member 71 with a fixing screw 73, which allows the movement operation member 72 to be replaced, facilitating maintenance if the movement operation member 72 is damaged. Furthermore, the material of the movement operation member 72 can be made different from that of the locking member 71, allowing for customization using different materials.

[0036] [Second embodiment] A clasp 1B of the second embodiment will be described with reference to Figures 10, 11, and 12. In the second embodiment and the following embodiments, components that are the same as or similar to those of the first embodiment will be designated by the same reference numerals, and descriptions thereof will be simplified or omitted. The clasp 1B includes a clasp cover 40B, an engagement unit 60, and a locking mechanism 70B. A flat rectangular opening 412B is formed in the clasp cover 40B. The engagement unit 60 has the same configuration as in the first embodiment and includes a guide frame 61, a slide plate 62, a coil spring 63, and a push button 64. The locking mechanism 70B includes a locking member 71B. The locking member 71B includes a rectangular plate-shaped main body 711B, a pair of restricting portions 713B protruding from the underside of the main body 711B, and an operating lever portion 717B protruding from the front surface of the main body 711B. The locking member 71B can be formed, for example, by injection molding made of synthetic resin. The operating lever portion 717B protrudes from the main body portion 711B to the front surface side, and is inserted into an opening 412B formed in the clasp cover 40B, protruding from the front surface side of the clasp cover 40B. 11 and 12, in order to make the slide plate 62 and the push button 64 easier to see, some components such as the lock mechanism 70B, the coil spring 63, the lock pin 21, and the opening 412B are shown by various dotted lines.

[0037] In the clasp 1B of the second embodiment, by sliding the operating lever 717B in the X-axis direction within the opening 412B, the restricting portion 713B of the locking member 71B can be moved from one of the first groove 623, which is the operation restricting position, to the second groove 624, which is the operation permitting position. By positioning the restricting portion 713B in the first groove 623, the pushing operation of the push button 64 can be restricted. By positioning the restricting portion 713B in the second groove 624, the pushing operation of the push button 64 can be permitted. Therefore, in the clasp 1B of the second embodiment, by moving the locking member 71B to the operation restricting position, the engagement between the lock pin 21 and the sliding plate 62 can be maintained even if the push button 64 is unintentionally pressed while diving, etc., thereby achieving the same effect as the clasp 1 of the first embodiment. Furthermore, since the locking member 71B, which includes the main body portion 711B, the restricting portion 713B, and the operating lever portion 717B, can be manufactured by integral molding, assembly workability can be improved compared to the locking mechanism 70 in which the locking member 71 and the moving operating member 72 are assembled with the fixing screw 73.

[0038] [Third embodiment] A clasp 1C of the third embodiment will be described with reference to FIGS. The clasp 1C includes a clasp cover 40C, an engagement unit 60C, and a locking mechanism 70C. An open groove 412C is formed on the side surface of the clasp cover 40C facing in the X1 direction. The engagement unit 60C includes a guide frame 61, a slide plate 62C, a coil spring 63, and a push button 64C. The slide plate 62C is formed with a first recessed groove portion 623C and a protrusion 625C. The push button 64C has a storage groove 643C formed on the X1 direction side from a position facing the apex of the protrusion 625C. The locking mechanism 70C includes a locking member 71C. The locking member 71C includes a rectangular plate-shaped main body 711C, a pair of extensions 712C extending from the main body 711C, and an operating lever 717C protruding from a short portion of the main body 711C in the X1 direction toward the front surface. The main body 711C is disposed in an opening groove 412C of the clasp cover 40C, and the operating lever 717C is disposed at a position protruding from the side surface of the clasp cover 40C in the X1 direction. The locking member 71C can be formed, for example, by an injection molding made of synthetic resin. A recess 7121 is formed on the inner surface of each extension 712C, and the portion distal to the recess 7121 constitutes a restricting portion 713C.

[0039] In the clasp 1C of the third embodiment, sliding the operating lever 717B protruding from the clasp cover 40C in the X-axis direction switches between an operation restricted state in which the restricting portion 713C of the locking member 71C is positioned in the first recessed groove 623C as shown in FIG. 14 and an operation permitted state in which the restricting portion 713C of the locking member 71C is positioned further toward the X1 direction than the protrusion 625C as shown in FIG. 15. To switch from the operation permitted state to the operation permitted state, the user must slide the operating lever 717C in the X2 direction so that the restricting portion 713C clears the protrusion 625C. Therefore, the operation permitted state cannot be switched to the operation restricted state without the user operating the operating lever 717C. In the operation restricted state, the protrusion 625C fits into the recess 7121, so the locking member 71C is held in the operation restricted position. Therefore, the operation can be switched from the operation restricted state to the operation permitted state only when the user slides the operation lever portion 717C in the X1 direction and the restricting portion 713C passes over the protrusion 625C. In the operation restricted state, as shown in Fig. 14, the restricting portion 713C is held in the first recessed groove portion 623C and abuts against the push button 64C, thereby restricting the push operation of the push button 64C. In the operation permitted state, as shown in Fig. 15, the restricting portion 713C is positioned opposite the storage groove 643C, thereby permitting the push operation of the push button 64C. Therefore, in the clasp 1C of the third embodiment, by moving the locking member 71C to the operation restriction position, even if the push button 64C is unintentionally pressed while diving, for example, the locking pin 21 and the slide plate 62C can be maintained in an engaged state, thereby achieving the same effect as the clasp 1 of the first embodiment. Furthermore, the locking member 71C is disposed on the X1 direction side of the slide plate 62C and is not disposed on the surface side of the slide plate 62C, so that the thickness of the clasp 1C can be made thin.

[0040] [Fourth embodiment] A clasp 1D of the fourth embodiment will be described with reference to FIGS. The clasp 1D includes a clasp cover 40D, an engagement unit 60C, and a locking mechanism 70D. An opening 412D is formed in the surface of the clasp cover 40D. The engagement unit 60C has the same configuration as that of the third embodiment, and therefore the same reference numerals are used and the description thereof will be omitted. The locking mechanism 70D includes a locking member 71D and a movement operating member 72D. The locking member 71D includes a rod-shaped main body 711D, a pair of extensions 712D extending from the main body 711D, and a connecting member 718D extending in the X1 direction from the main body 711D. The movement operating member 72D is disposed on the front side of the clasp cover 40D and is fixed to the connecting member 718D with a pin or screw through an opening 412D. A recess 7121 is formed on the inner surface of each extension portion 712D, and the portion on the tip side of this recess 7121 serves as a restriction portion 713D.

[0041] In the clasp 1D of the fourth embodiment, as in the third embodiment, by sliding the moving operating member 72D provided on the front side of the clasp cover 40C in the X-axis direction, it is possible to switch between an operation restricted state in which the restricting portion 713D of the locking member 71D is positioned in the first groove portion 623C as shown in FIG. 17 and an operation permitted state in which the restricting portion 713D of the locking member 71D is positioned further toward the X1 direction than the protrusion 625C as shown in FIG. 18. In the operation restricted state, as shown in Fig. 17, the restricting portion 713D is held in the first recessed groove portion 623C and abuts against the push button 64C, thereby restricting the push operation of the push button 64C. In the operation permitted state, as shown in Fig. 18, the restricting portion 713D is positioned opposite the storage groove 643C, thereby permitting the push operation of the push button 64C. Therefore, in the clasp 1D of the fourth embodiment, by moving the locking member 71D to the operation restriction position, the engagement between the locking pin 21 and the sliding plate 62C can be maintained even if the push button 64C is unintentionally pressed while diving, etc., and the same effect as the clasp 1 of the first embodiment can be achieved. In addition, the locking member 71D is located on the X1 direction side of the sliding plate 62C, and is not overlapped on the front side of the sliding plate 62C, which allows the thickness of the clasp 1D to be thin. Furthermore, the moving operation member 72D allows a logo to be displayed in the same way as the moving operation member 72.

[0042] [Fifth embodiment] A clasp 1E of the fifth embodiment will be described with reference to FIGS. The clasp 1E includes a clasp cover 40E, an engagement unit 60E, and a locking mechanism 70E. Two through holes 412E are formed in the surface of the clasp cover 40E. The engagement unit 60E includes a guide frame 61, a slide plate 62E, a coil spring 63, and a push button 64E. A first recessed groove portion 623E is formed on the surface of the slide plate 62E facing the push button 64E. The locking mechanism 70E includes a locking member 71E. The locking member 71E includes a rectangular plate-shaped main body 711E and a pair of restricting portions 713E protruding from the underside of the main body 711E. The main body 711E of the locking member 71E is disposed on the front surface side of the clasp cover 40E and also serves as a movement operating member. The pair of restricting portions 713E of the locking member 71E are formed in a round shaft shape and are inserted into the through-holes 412E of the clasp cover 40E.

[0043] In the clasp 1E of the fifth embodiment, by moving the main body 711E arranged on the surface of the clasp cover 40E in the Z-axis direction, it is possible to switch between an operation restricted state in which the restricting portion 713E of the locking member 71E is positioned inside the clasp cover 40E and placed in the first groove portion 623E, as shown in FIG. 19, and an operation permitted state in which the restricting portion 713E of the locking member 71E is pulled up from the inside of the clasp cover 40E and not placed in the first groove portion 623E, as shown in FIG. 20. In the operation restricted state, as shown in Fig. 19, restricting portion 713E is disposed in first groove portion 623E and abuts against push button 64E, thereby restricting the push operation of push button 64E. In the operation permitted state, as shown in Fig. 20, restricting portion 713E is pulled up from first groove portion 623E to a position where it does not face push button 64E, thereby permitting the push operation of push button 64E. Therefore, in the clasp 1E of the fifth embodiment, by moving the locking member 71E to the operation restriction position, even if the push button 64E is unintentionally pressed while diving, for example, the engagement between the locking pin 21 and the sliding plate 62E can be maintained, thereby achieving the same effect as the clasp 1 of the first embodiment. Furthermore, locking member 71E has a simple shape composed of only main body portion 711E and restricting portion 713E, and push button 64E has a simple shape without a storage groove, so that the manufacturing costs of each can be reduced.

[0044] [Variations] The present disclosure is not limited to the above-described embodiments, and includes modifications, improvements, etc. within the scope of achieving the object of the present disclosure. The configurations of the engaging member and the engaged portion are not limited to those of the above-described embodiments. For example, a configuration in which the engaging member moves in the X-axis direction to engage with the engaged portion may be adopted. That is, the engaged portion may be formed by forming a claw portion protruding in the X2 direction or an engaging groove opening in the X2 direction on the middle plate 20. Alternatively, an engaging member may be provided that is biased in the X1 direction and abuts against the push button at a sloped surface, so that it moves in the X2 direction when the push button is pressed. Even with this configuration, the same effects as those of the above-described embodiments can be achieved by providing a locking member that can restrict the push button from being pressed. Furthermore, the operating member is not limited to a pair of push buttons, but may be a single button, a lever, a rotating knob, etc., as long as it can move an engaging member such as the slide plate 62 by an operation such as pushing, sliding, or rotating. The biasing means is not limited to the coil spring 63 separate 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 engaging member such as the slide plate 62, so that the engaging member also serves as the biasing member.

[0045] In the first embodiment, the first groove 623 and the second groove 624 are formed in the slide plate 62, but the first groove and the second groove may be formed in the push button 64. In this case, the dimension of the second groove in the Y-axis direction may be made longer than the first groove 623 so that it also serves as a storage groove. In other embodiments, the first groove and the second groove may be formed on the button side. Furthermore, the configuration for holding the locking member at the operation restricted position or the operation permitted position is not limited to the configuration in which the restricting portion that restricts the movement of the push button is engaged with the first groove portion or the second groove portion. For example, a configuration in which an elastically deformable convex portion is formed on the guide frame that guides the locking member in the sliding direction, and a concave portion is formed on the locking member, may be used to hold the locking member at the operation restricted position or the operation permitted position. Furthermore, the locking member 71 and the moving operation member 72 are not limited to being connected by the fixing screw 73, but may be connected by adhesive, welding, etc. In other words, the locking mechanism is not limited to the configurations of the above-described embodiments, and may be any mechanism that can switch between restricting and permitting the operation of an operation member such as the push button 64. The clasp 1 can be used not only for watch bands, but also for bands for accessories such as bracelets and necklaces.

[0046] Summary of this disclosure The clasp disclosed herein is a clasp that connects a first band and a second band, and includes a connecting member connected to the first band side and having an engaged portion, and a clasp main body connected to the second band side. The clasp main body is equipped with an engaging member that is movable to an engaging position where it can engage with the engaged portion and to a releasing position where it can disengage from the engaged portion, an operating member that moves the engaging member from the engaging position to the releasing position, and a locking member that is movable to an operation restricting position that restricts operation of the operating member and to an operation allowing position that permits operation of the operating member. When the engaging member is not engaged with the engaged portion, the engaging member can be engaged with the engaged portion without operating the operating member, and when the engaging member is engaged with the engaged portion, the engagement is released by moving the engaging member to the releasing position with the operating member, and when the locking member is moved to the operation restricting position, the operating member restricts movement of the engaging member to the releasing position. According to the present disclosure, by moving the locking member to the operation restricted position, the engagement member is restricted from moving to the release position, and the engagement state between the engaging member and the engaged portion can be maintained even if an unintended external force is applied to the operating member. Therefore, by moving the locking member to the operation restricted position, it is possible to prevent the clasp from coming off while diving, etc. In addition, the engaging member and operating member are separate, and the locking member restricts only the operation of the operating member. When the engaging member is not engaged with the engaged portion, the engaging member can be engaged with the engaged portion without operating the operating member. Therefore, even if the locking member is mistakenly moved to the operation restriction position when the clasp is disengaged, i.e., when the engaging member is not engaged with the engaged portion, the engaging member can still be engaged with the engaged portion. This prevents the clasp from failing to close or from being damaged by trying to force the clasp to close.

[0047] In the clasp disclosed herein, the clasp body preferably includes a biasing member that biases the engaging member toward the engaging position, and at least one of the engaged portion and the engaging member preferably has a guide surface that moves the engaging member from the engaging position to the releasing position against the biasing force of the biasing member when the engaging member is brought into contact with the engaged portion. In the present disclosure, when the engaging member is brought into contact with the engaged portion, the engaging member can be moved from the engaged position to the released position against the biasing force of the biasing member, so that when the clasp is in an open state, the clasp can be easily closed simply by bringing the connecting member and the clasp body into contact with each other.

[0048] In the clasp disclosed herein, it is preferable that the locking member has a positioning portion, the engaging member has a retaining portion with which the positioning portion is engaged, and the locking member is retained in the operation restricting position by the positioning portion engaging with the retaining portion. In the present disclosure, the positioning portion of the locking member engages with the holding portion of the engagement member to hold the locking member in the operation restricted position. This prevents the locking member from moving to the operation permitted position without user operation, ensuring that the operation restricted state is maintained. Furthermore, when the locking member is moved to the operation restricted position, the positioning portion engages with the holding portion, so the user feels a click and can easily recognize that the locking member has moved to the operation restricted position.

[0049] In the clasp of the present disclosure, it is preferable that the locking member has a movement operating member that is operated by the user, and that the movement operating member has a logo display portion on which a logo is displayed. In the present disclosure, a logo can be displayed on the movement operation member of the locking member that is operated by the user, thereby enhancing brand power, etc.

[0050] In the clasp of the present disclosure, it is preferable that the locking member be moved in a connecting direction in which the clasp body and the first band are connected. In the present disclosure, the locking member slides in the direction of connection between the clasp body and the first band, i.e., in the longitudinal direction of the first band and the second band, so that the locking member can be easily moved to both the operation restricting position and the operation permitting position.

[0051] In the clasp disclosed herein, the engaging member is composed of a pair of slide plates arranged with the engaged portion sandwiched between them, the operating member is composed of a pair of push buttons abutting against the slide plates, the slide plates each having a main body abutting against the push buttons, engaging portions arranged with the engaged portion sandwiched between them, and a connecting portion connecting the main body and the engaging portions, the engaging portion of one slide plate being disposed between the main body and the engaging portion of the other slide plate, and a coil spring being disposed between the pair of slide plates for biasing the slide plates in a direction separating them from each other to bring the engaging portions closer to each other, and it is preferable that the locking member has a restricting portion disposed between the main body of the slide plate and the push button to restrict pushing of the push button when moved to the operation restricting position. In the present disclosure, a coil spring biases a pair of slide plates in a direction separating them from each other, and because the main body of the slide plate abuts against a pair of push buttons, the pair of push buttons can also be biased away from each other by the coil spring. This eliminates the need for a separate spring or the like to bias the push buttons outward, reducing the number of parts. Furthermore, by providing a restricting portion disposed between the slide plate and the push buttons, the locking member can restrict the pushing operation of the push buttons, simplifying the structure of the locking member and reducing costs.

[0052] In the clasp of the present disclosure, it is preferable that the main body portion of the slide plate has a first groove portion that holds the regulating portion in the operation restricting position and a second groove portion that holds the regulating portion in the operation permitting position, and that the push button has a storage groove formed at a position facing the second groove portion in which the regulating portion is stored when the push button is pressed with the regulating portion positioned in the second groove portion. In the present disclosure, the slide plate is biased toward the push button and the restricting portion of the locking member by a coil spring, so the biasing force of the coil spring can press the first groove portion or the second groove portion against the restricting portion. Therefore, the biasing force of the coil spring can be used to hold the position of the restricting portion, i.e., the locking member, in the operation-permitting position or the operation-restricting position. Furthermore, when the locking member is moved to move the restricting portion between the first groove portion and the second groove portion, the restricting portion pushes the slide plate against the biasing force of the coil spring until the restricting portion disengages from one groove portion and is retained in the other groove portion. This allows a clicking sensation to be felt when moving the locking member. Because the functions of holding the position of the restricting portion and providing a clicking sensation when moving the locking member can be achieved by the coil spring and each groove portion, a simple structure can be achieved, without compromising operability, and durability can be increased.

[0053] The timepiece of the present disclosure is characterized by comprising the clasp described above, and the first band and the second band connected to the clasp. In the timepiece of the present disclosure, even if the locking member is mistakenly moved to the operation restricted position, the engaging member can still engage with the engaged portion. Therefore, a timepiece with a clasp of the present disclosure can be worn securely on the wrist. [Explanation of symbols]

[0054] 1...clasp, 1B...clasp, 1C...clasp, 1D...clasp, 1E...clasp, 2...folding member, 4...clasp body, 10...exterior case, 11...first band, 12...second band, 20...middle plate, 21...lock pin, 22...shaft portion, 23...umbrella portion, 30...outer plate, 40...clasp cover, 40B...clasp cover, 40C...clasp cover, 40D...clasp cover, 40E...clasp cover, 41...surface portion, 42...side Wall portion, 50...clasp frame portion, 55...clasp connecting portion, 61...guide frame, 62...slide plate, 62C...slide plate, 62E...slide plate, 63...coil spring, 64...push button, 64C...push button, 64E...push button, 70...locking mechanism, 70B...locking mechanism, 70C...locking mechanism, 70D...locking mechanism, 70E...locking mechanism, 71...locking member, 71B ...locking member, 71C...locking member, 71D...locking member, 71E...locking member, 72...movement operation member, 72D...movement operation member, 100...wristwatch, 620...main body, 621...engagement portion, 622...connecting portion, 623...first groove portion, 623C...first groove portion, 623E...first groove portion, 624...second groove portion, 625...protrusion, 625C...protrusion, 643...storage groove, 643C...storage groove, 711...main body portion, 711B...main body portion, 711C...main body portion, 711D...main body portion, 711E...main body portion, 712...extension portion, 712C...extension portion, 712D...extension portion, 713...regulation portion, 713B...regulation portion, 713C...regulation portion, 713D...regulation portion, 713E...regulation portion, 715...groove portion, 717B...operation lever portion, 717C...operation lever portion, 718D...connection portion, 7211...logo display portion.

Claims

1. A clasp connecting the first band and the second band, a connecting member connected to the first band side and having an engaged portion; a clasp body connected to the second band side, The clasp body is an engaging member that is movable to an engaging position where it can engage with the engaged portion and a releasing position where it can release the engagement with the engaged portion; an operating member that moves the engaging member from the engaging position to the releasing position; a locking member that is movable between an operation restricting position that restricts operation of the operating member and an operation permitting position that permits operation of the operating member, When the engaging member is not engaged with the engaged portion, the engaging member can be engaged with the engaged portion without operating the operating member, When the engaging member is engaged with the engaged portion, the engagement is released by moving the engaging member to the release position with the operating member, When the locking member is moved to the operation restricted position, the operation member restricts the engagement member from being moved to the release position. A clasp characterized by its shape.

2. The buckle according to claim 1, The clasp body is a biasing member that biases the engaging member toward the engaging position, At least one of the engaged portion and the engaging member has a guide surface that moves the engaging member from the engaged position to the released position against the biasing force of the biasing member when the engaging member is brought into contact with the engaged portion. A clasp characterized by its shape.

3. The buckle according to claim 1, The locking member has a positioning portion, the engaging member has a holding portion with which the positioning portion is engaged, The locking member is held in the operation restricting position by the positioning portion being engaged with the holding portion. A clasp characterized by its shape.

4. The buckle according to claim 1, the locking member has a movement operating member that is operated by a user, The moving operation member has a logo display section on which a logo is displayed. A clasp characterized by its shape.

5. The buckle according to claim 1, The locking member is moved in a connecting direction in which the clasp body and the first band are connected. A clasp characterized by its shape.

6. The buckle according to claim 1, The engaging member is composed of a pair of slide plates arranged with the engaged portion sandwiched therebetween, the operating member is composed of a pair of push buttons that come into contact with the slide plate, the slide plate includes a main body portion that contacts the push button, an engaging portion that is disposed across the engaged portion, and a connecting portion that connects the main body portion and the engaging portion; the engaging portion of one of the slide plates is disposed between the main body portion and the engaging portion of the other of the slide plates, A coil spring is disposed between the pair of slide plates to bias the slide plates in a direction separating them from each other and bring the engagement portions closer to each other, The locking member has a restricting portion that is disposed between the main body of the slide plate and the push button when the locking member is moved to the operation restricting position and restricts the pushing operation of the push button. A clasp characterized by its shape.

7. The buckle according to claim 6, the main body portion of the slide plate has a first groove portion that holds the restricting portion at the operation restricting position and a second groove portion that holds the restricting portion at the operation permitting position, The push button has a receiving groove formed at a position facing the second groove portion, into which the restricting portion is received when the push button is pressed with the restricting portion disposed in the second groove portion. A clasp characterized by its shape.

8. The clasp according to any one of claims 1 to 7, A timepiece comprising the first band and the second band connected to the clasp.

Images