Band adjustment mechanism, clasp, band and watch

Abstract

To provide a band adjusting mechanism which has a simple configuration and can be operated intuitively, and which can improve the durability of parts related to length adjustment as compared with conventional techniques.SOLUTION: A band adjusting mechanism 1 has an upper case 11, a slider 4, an engaging pipe 2, an anchor 3, convex portions 32, 33, and a first fixing portion 43. The slider 4 slides with respect to the upper box 11. The engagement pipe 2 is fixed to the upper box 11. The anchor 3 is connected to the upper case 11 so as to be openable and closable, and opens and closes between an open state that allows the slider 4 to slide and a closed state that restricts the slide. The convex portions 32, 33 protrude from the anchor 3 toward the slider 4 and restrict the slider 4 from sliding when the anchor 3 is in the closed state. The first fixing portion 43 protrudes from the slider 4 toward the anchor 3 and restricts sliding of the slider 4 by engaging with the convex portions 32, 33.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present invention relates to a band adjustment mechanism, a clasp, a band, and a watch. [Background technology]

[0002] 2. Description of the Related Art Various mechanisms have been proposed for adjusting the length of a wristwatch band, such as those provided on a clasp.

[0003] For example, Patent Document 1 discloses a band adjustment mechanism that includes a clasp cover, a sliding member that changes the length between the first band and the second band by sliding relative to the clasp cover, a restricting portion that engages with a groove formed in the sliding member to restrict the sliding, an operating portion that is operated to release the restriction imposed by the restricting portion, and a locking mechanism that covers the operating portion. According to the technology described in Patent Document 1, the operating portion for sliding the sliding member is covered by the clasp cover when the clasp is locked. This is said to prevent malfunctions such as accidentally changing the length of the band when unlocking the clasp. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Publication No. 2020-99573 Summary of the Invention [Problem to be solved by the invention]

[0005] In the technology described in Patent Document 1, the restricting portion is constantly biased toward the sliding member by a spring, thereby engaging with the sliding member. However, when a spring is used to restrict the sliding movement, there is a risk that the operability of length adjustment may be reduced due to, for example, spring wear or deterioration. In particular, when applied to small parts such as a watch clasp, the spring size is inevitably small, making it prone to deterioration and wear, leaving durability issues unresolved. In addition, it is necessary to push the restricting portion to release its engagement with the sliding member while sliding the sliding member. This can easily lead to a complex configuration, which can make operation difficult.

[0006] Therefore, the present invention aims to provide a band adjustment mechanism that has a simple configuration and allows intuitive operation, and that can improve the durability of parts related to length adjustment compared to conventional technology, as well as a clasp equipped with the same, a band equipped with this clasp, and a watch equipped with this band. [Means for solving the problem]

[0007] In order to solve the above problem, one embodiment of the band adjustment mechanism of the present invention includes an upper box connected to a first band, and a second band connected to the upper box. Along the longitudinal direction of the upper box The anchor comprises a sliding slider, an engaging pipe provided on the upper box and extending in a direction intersecting the sliding direction of the slider, an anchor connected to the upper box via a shaft portion so as to be able to open and close, and which opens and closes between an open state which allows the slider to slide and a closed state which restricts the sliding of the slider, and which has an engaging portion which engages with the engaging pipe in the closed state, at least one convex portion which protrudes from the anchor toward the slider, forms at least two or more recesses on the surface of the anchor, and restricts the sliding of the slider when the anchor is in the closed state, and a first fixing portion which protrudes from the slider toward the anchor and restricts the sliding of the slider by engaging with the convex portion.

[0008] With this configuration, the length between the first and second bands can be adjusted by opening the anchor and then sliding the slider. In this way, the band length can be adjusted with two simple operations: opening the anchor and sliding the slider. This allows for a simple configuration and intuitive operation for the user. It also reduces the number of parts and cuts costs. Furthermore, by using a slider to adjust the length, the overall device can be made thinner while maintaining its strength. The protrusion forms two or more recesses on the surface of the anchor, and the first fixing part of the slider fits into one of the recesses and engages with the protrusion. By selecting the recess into which the first fixing part fits, the length of the band can be adjusted to the user's desired length, thereby improving user operability. Furthermore, by engaging the anchor's engagement portion with the engagement pipe of the upper box, the anchor can be closed, disabling the slider. This prevents malfunctions, such as accidentally operating the slider when, for example, attaching or detaching the band from the user's body. Because the anchor covers the slider in the closed state, it protects the slider from external impacts when not adjusting. This improves the durability of the band adjustment mechanism. Furthermore, the anchor is configured to be rotatable to the upper box via the shaft and is closed by engaging the engagement portion. In other words, no spring or other device is used to open or close the anchor. Therefore, compared to conventional technologies that use springs or other devices to open or close the anchor to restrict sliding, this technology prevents malfunctions and reduced durability due to spring deterioration. Furthermore, it allows for a simpler configuration than using a spring. Therefore, it is possible to provide a band adjustment mechanism that has a simple configuration, allows intuitive operation, and can improve the durability of parts related to length adjustment compared to conventional techniques.

[0009] In addition, in the band adjustment mechanism, the engagement pipe rotates around an axis along a direction intersecting the sliding direction of the slider.

[0010] With this configuration, the engagement pipe is rotatable, so the anchor's engagement portion can be engaged with and disengaged from the engagement pipe with less force. Furthermore, a clicking sensation can be provided when the engagement portion and engagement pipe engage. This improves the ease of adjustment. Furthermore, because the engagement pipe is rotatable, wear caused by friction between the engagement portion and engagement pipe can be reduced. This improves the durability of the engagement pipe and anchor. Furthermore, because the anchor is locked with an axis and an engagement pipe that rotates around the axis, the anchor can be configured with relatively large parts compared to conventional technologies that use springs or the like to lock the anchor. This improves the maintainability of the band adjustment mechanism.

[0011] In addition, the band adjustment mechanism has a pressing portion that moves the slider in the sliding direction away from the first band as the anchor rotates from the closed state to the open state, and the slider has an abutment portion that abuts against the pressing portion of the anchor.

[0012] With this configuration, when the anchor is rotated from the closed state to the open state, the pressing portion of the anchor abuts against the abutting portion of the slider, causing the slider to slide in a predetermined direction. This allows the anchor to open and close and the slider to slide simultaneously. In other words, adjustment can be made with a single touch. This eliminates the user's effort in adjusting the length of the band and further improves the operability of the band adjustment mechanism.

[0013] In addition, the band adjustment mechanism further includes a second fixing portion that is arranged in a direction away from the first band in the sliding direction relative to the first fixing portion and that restricts the sliding of the slider with a force weaker than that of the first fixing portion.

[0014] With this configuration, the second fixing portion restricts the sliding movement of the slider with a force weaker than that of the first fixing portion. A force weaker than that of the first fixing portion means, for example, that the slider is still slidable, but that applies a weight at a predetermined timing during the sliding operation compared to when the slider is slid without load. This allows, for example, a clicking sensation to be imparted depending on the sliding position, and the length to be adjusted in stages. This further improves user operability.

[0015] In addition, the second fixing portion of the band adjustment mechanism includes a plurality of holes provided on the side surface of the upper box, and a lateral protrusion provided on the slider that is biased toward the side surface and engages with the holes.

[0016] According to this configuration, the lateral protrusions of the slider engage with multiple holes provided on the side of the upper box. Because the lateral protrusions are biased toward the side, when the lateral protrusions are positioned between the multiple holes, they are pressed toward the side opposite the side, facilitating sliding. On the other hand, when the lateral protrusions are positioned so as to overlap with the holes, they engage with the holes and restrict sliding with a weak force. This provides a clicking sensation when the slider slides, and allows the length to be adjusted in stages.

[0017] One embodiment of the clasp of the present invention is a clasp for a watch that is provided with the above-described band adjustment mechanism.

[0018] This configuration offers particularly significant benefits when applied to a watch clasp. Because the length adjustment mechanism is simple and made up of few components, it can provide length adjustment functionality without compromising the appearance or design, even when applied to a small (thin) part like a watch clasp. Furthermore, even when the clasp has functions other than length adjustment, such as opening and closing the clasp, the user can intuitively operate it. Furthermore, even when the clasp is subjected to vibrations or impacts, it offers improved operability and durability compared to conventional technologies. Therefore, it is possible to provide a clasp equipped with a band adjustment mechanism that has a simple configuration and allows intuitive operation, and can improve the durability of parts related to length adjustment compared to conventional technology.

[0019] In addition, the clasp and the anchor can be opened and closed independently of the opening and closing of the clasp when the clasp is in an open state.

[0020] With this configuration, the opening and closing of the anchor and the opening and closing of the clasp are independent. This prevents the adjustment mechanism from being unintentionally operated when the clasp is opened or closed, compared to conventional technology in which the clasp rail also serves as a locking mechanism for the slider. This reduces malfunction of the adjustment mechanism.

[0021] A band according to one embodiment of the present invention includes the above-described clasp for a watch.

[0022] This configuration allows for a band with a clasp equipped with a band adjustment mechanism that has a simple configuration and allows for intuitive operation, and can improve the durability of parts related to length adjustment compared to conventional technology.

[0023] A timepiece according to one embodiment of the present invention comprises a timepiece body and the above-described band connected to the timepiece body.

[0024] This configuration allows for a watch to be provided with a band having a clasp equipped with a band adjustment mechanism that has a simple configuration and allows for intuitive operation, and can improve the durability of parts related to length adjustment compared to conventional technology. [Effects of the Invention]

[0025] According to the present invention, it is possible to provide a band adjustment mechanism that has a simple configuration and allows intuitive operation, and that can improve the durability of parts related to length adjustment compared to conventional technology, as well as a clasp equipped with the same, a band equipped with this clasp, and a watch equipped with this band. [Brief explanation of the drawings]

[0026] [Figure 1] FIG. 1 is a top view showing an example of a timepiece according to a first embodiment. [Figure 2] FIG. 2 is a side view of the clasp according to the first embodiment. [Figure 3] FIG. 2 is an enlarged side view of the upper box portion of the clasp according to the first embodiment. [Figure 4] FIG. 2 is a side cross-sectional view of the band adjustment mechanism according to the first embodiment, showing the clasp in a closed state. [Figure 5] FIG. 2 is a side cross-sectional view of the band adjustment mechanism showing the clasp and anchor in the open state according to the first embodiment. [Figure 6] FIG. 4 is a side cross-sectional view of the band adjustment mechanism showing a state during sliding of the slider according to the first embodiment. [Figure 7] FIG. 10 is a side cross-sectional view of the band adjustment mechanism showing the anchor according to the first embodiment in a re-closed state. [Figure 8] FIG. 10 is a side view of a clasp according to a second embodiment. [Figure 9] FIG. 10 is a side cross-sectional view of the band adjustment mechanism according to the second embodiment, showing the clasp in a closed state. [Figure 10] FIG. 10 is a side cross-sectional view of the band adjustment mechanism according to the second embodiment, showing the clasp and anchor in an open state. [Figure 11] FIG. 11 is a side cross-sectional view of the band adjustment mechanism according to the second embodiment, showing a state in which the anchor has been further tilted and the slider has been slid. [Figure 12] FIG. 10 is a cross-sectional side view of the band adjustment mechanism showing the anchor according to the second embodiment in a re-closed state. [Figure 13] FIG. 10 is a perspective view showing the back surface of the anchor according to the second embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0027] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. In the following description, components having the same or similar functions will be assigned the same reference numerals. Duplicate descriptions of these components may be omitted. In the following description, the side that faces the user's wrist when the wristwatch is worn may be referred to as the back side, and the opposite side may be referred to as the front side.

[0028] (First embodiment) (Watches and bands) Fig. 1 is a top view showing an example of a timepiece according to the first embodiment. The timepiece shown in Fig. 1 is a wristwatch 100a, and includes a watch body 10a, and a first band 14 and a second band 15, which are wristwatch bands. The watch body 10a is configured, for example, by housing the dial, hands, and movement that controls the movement of the hands inside a watch case. The watch case is configured, for example, by a metal frame (body), a crystal glass made of a transparent material such as glass or plastic, and a metal back cover. The first band 14 and the second band 15 are each formed by connecting, for example, multiple metal links. The first band 14 and the second band 15 are each connected to the watch body 10a with spring bars or the like. Note that only a portion of the first band 14 and the second band 15 is shown in FIG. 1.

[0029] (Nakatome) FIG. 2 is a side view of the clasp 10 according to the first embodiment. Clasp 10 is, for example, a clasp 10 for wristwatch 100a shown in Fig. 1. Clasp 10 is provided on the end of first band 14 and second band 15 opposite watch body 10a, and connects first band 14 and second band 15. Clasp 10 has a rail 12, an upper box 11, a clasp opening / closing mechanism 13, and a band adjustment mechanism 1.

[0030] Rail 12 comprises an inner rail 19, one end of which is connected to first band 14, and an outer rail 18, the other end of which is connected to inner rail 19 via hinge 19a. Inner rail 19 and outer rail 18 are strip-shaped members of approximately the same length. When wristwatch 100a is worn, inner rail 19 and outer rail 18 overlap each other and are each curved in an arc-like shape when viewed from the side so as to fit the user's wrist. The state in which inner rail 19 and outer rail 18 overlap refers to the state in which the main surface, which is the outer peripheral surface of arc-shaped inner rail 19, and the back surface, which is the inner peripheral surface of arc-shaped outer rail 18, overlap each other.

[0031] The first band 14 is rotatably connected to one end of the inner rail 19. A hinge 19a for connecting the outer rail 18 is provided at the other end of the inner rail 19. The inner rail 19 has a lock pin 21 provided to stand on one of its main surfaces. The lock pin 21 has a cylindrical stem 21a and a hemispherical portion 21b provided at the tip of the stem 21a. The hemispherical portion 21b is formed in a hemispherical shape with a larger diameter than the stem 21a. The hemispherical portion 21b is arranged so that its diameter decreases toward the tip of the lock pin 21. The lock pin 21 constitutes part of the clasp opening / closing mechanism 13, which will be described in detail later.

[0032] The outer rail 18 is rotatably connected to the other end of the inner rail 19 via a hinge 19a provided at the other end of the inner rail 19. Furthermore, the outer rail 18 is connected to the upper box 11 via a hinge 18a at the other end opposite the one end to which the inner rail 19 is connected. A through-hole (not shown) is formed in the outer rail 18, through which a lock pin 21 passes when the inner rail 19 and the outer rail 18 are overlapped.

[0033] The upper box 11 is rotatably connected to the other end of the outer rail 18 via a hinge 18a provided at the other end of the outer rail 18. In other words, the first band 14 is connected to a first end 26 (see FIG. 3) of the upper box 11 via the rail 12. When viewed from the side, the upper box 11 is formed in an arc shape with the same curvature as the inner rail 19 and outer rail 18. The upper box 11 is formed in a box shape that opens toward the back side (the side that faces the wrist when the wristwatch 100a is worn). Specifically, the upper box 11 has a curved, rectangular plate-shaped surface portion 23 and a pair of side walls, a first side wall 24 and a second side wall 25 (see FIG. 3), provided at both ends along the longitudinal direction of the surface portion 23 and facing each other in parallel. The upper box 11 covers the inner rail 19 and outer rail 18, which overlap each other. In this embodiment, the upper box 11 is a part of the components of the band adjustment mechanism 1, which will be described in detail later.

[0034] The clasp opening / closing mechanism 13 opens and closes the clasp 10 between a closed state in which the inner rail 19, the outer rail 18, and the top box 11 are overlapped, and an open state in which the inner rail 19, the outer rail 18, and the top box 11 are no longer overlapped. The clasp opening / closing mechanism 13 has a button unit 51 provided on the top box 11 and the above-mentioned lock pin 21 provided on the inner rail 19.

[0035] FIG. 3 is an enlarged side view of the upper box 11 portion of the clasp 10 according to the first embodiment. 3, the button unit 51 is provided in the longitudinal direction of the upper box 11 near the end (first end 26) to which the inner rail 19 is connected. The button unit 51 has a pair of button members 52, a pair of springs (not shown), and a retaining member 54. The button unit 51 is provided inside the upper box 11 except for a portion of each of the pair of button members 52.

[0036] The pair of button members 52 are formed to protrude outward in the width direction from each of the first side wall 24 and the second side wall 25 of the upper box 11. A portion of the pair of button members 52 is housed inside the upper box 11. A pair of springs (not shown) are in contact with a portion of the button member 52 that is housed inside the upper box 11. The pair of springs bias the button member 52 so that the button member 52 protrudes toward the outside of the upper box 11.

[0037] The retaining member 54 is provided inside the upper box 11. The retaining member 54 has an insertion hole 55 into which the lock pin 21 is inserted when the clasp 10 is closed. The insertion hole 55 is formed between a pair of gripping portions (not shown) that open and close to or move away from each other. In other words, the inner diameter of the insertion hole 55 changes as the distance between the pair of gripping portions changes. The pair of gripping portions are constantly biased by a spring (not shown) to move toward each other.

[0038] The pair of gripping portions are also connected to button member 52. For example, when a user presses button member 52 inward with their fingers, the pair of gripping portions move away from each other. On the other hand, when the user releases their hands from button member 52, the spring force causes the pair of gripping portions to move closer to each other. Therefore, by operating button member 52, the inner diameter of insertion hole 55 can be changed. As a result, when the user overlaps rail 12 and upper box 11, hemispherical portion 21b of lock pin 21 is locked into insertion hole 55 of retaining member 54, closing clasp 10. Meanwhile, with lock pin 21 locked, the user can press button member 52 to remove lock pin 21 from insertion hole 55, thereby opening clasp 10.

[0039] (Band adjustment mechanism) Band adjustment mechanism 1 is a mechanism for adjusting the length of the band if, for example, the hand swells and the band feels too tight or too loose. Band adjustment mechanism 1 is located on the second end 27 side of upper box 11 in the longitudinal direction, opposite first end 26 to which inner rail 19 is connected. Band adjustment mechanism 1 comprises upper box 11, which is also a component of clasp 10 described above, engagement pipe 2, slider 4, and anchor 3, which covers slider 4 from the back side (the side facing the arm when the watch is worn).

[0040] FIG. 4 is a side cross-sectional view of the band adjustment mechanism 1 showing the clasp 10 according to the first embodiment in a closed state. As shown in Figures 3 and 4, the engagement pipe 2 is provided inside the upper box 11, in the center in the longitudinal direction. The engagement pipe 2 is formed in an annular shape. The engagement pipe 2 extends along the width direction of the upper box 11, which is perpendicular to the longitudinal direction. The engagement pipe 2 is rotatable around an axis C2 extending along the width direction of the upper box 11. Both ends of the axis C2 are fixed to the first side wall 24 and the second side wall 25 of the upper box 11, respectively.

[0041] The slider 4 is housed inside the upper box 11 and slides in one direction relative to the upper box 11. Specifically, the sliding direction of the slider 4 coincides with the longitudinal direction of the upper box 11. In the following description, the direction of the sliding of the slider 4 toward the first end 26 of the upper box 11 may be referred to as a first direction D1, and the opposite direction may be referred to as a second direction D2. Furthermore, the directions that intersect with the sliding direction and the front-to-back direction may be referred to as width directions. The slider 4 has a slider body 41 , a first fixing portion 43 , and a standing wall 45 .

[0042] The slider body 41 is formed in a plate shape that fits along the surface portion 23 of the upper box 11. When viewed from the side, the slider body 41 is formed in an arc shape with the same curvature as the surface portion 23 of the upper box 11. Therefore, the slider body 41 can slide inside the upper box 11 along the longitudinal direction of the upper box 11. A shaft C3 for attaching the anchor 3 is provided on the back side of the slider body 41. The slider body 41 is sandwiched between the surface portion 23 of the upper box 11 and the shaft C3 (and the anchor 3) in the thickness direction (front-rear direction), thereby preventing the slider body 41 from coming off the upper box 11. If the friction between the slider body 41 and the surface 23 of the upper box 11 is large, the slider body 41 or the surface 23 of the upper box 11 may be provided with irregularities.

[0043] The first fixing portion 43 is a protrusion that protrudes from the slider body 41 toward the back side (the anchor 3 side). The first fixing portion 43 is integrally formed with the slider body 41. The first fixing portion 43 may be formed as a separate part from the slider body 41. The first fixing portion 43 is formed to extend across the entire width of the slider body 41. The first fixing portion 43 is provided at a position a predetermined distance from the end of the slider body 41 on the first direction D1 side in the sliding direction. A portion of the slider body 41 that is located closer to the first direction D1 than the first fixing portion 43 forms an extension portion 42. As shown in FIG. 3 , the extension portion 42 is inserted between the engagement pipe 2 and the surface portion 23 of the upper box 11 when the slider body 41 is located closest to the first direction D1 side.

[0044] The first fixing portion 43 restricts the sliding of the slider 4 by engaging with a protrusion provided on the anchor 3. In other words, when the first fixing portion 43 engages with the protrusion of the anchor 3, the slider 4 cannot slide. When the engagement between the first fixing portion 43 and the protrusion of the anchor 3 is released, the slider 4 becomes slidable.

[0045] The standing wall 45 stands upright from the slider body 41 towards the back side (the anchor 3 side). The standing wall 45 is integrally formed with the slider body 41. The standing wall 45 is formed so as to extend across the entire width direction of the slider body 41. The standing wall 45 is provided at the end of the slider body 41 on the second direction D2 side in the sliding direction. The standing wall 45 is formed higher than the first fixing portion 43 in the thickness direction of the slider 4.

[0046] A second band 15 is connected to the surface of the standing wall 45 on the second direction D2 side via a joint fixing portion 47. Note that in the figure, the second band 15 is simply shown as a single metal piece 15, but the actual second band 15 is formed of a plurality of metal pieces 15, as partially shown in FIG. 1. Of the plurality of pieces, the piece 15 connected to the joint fixing portion 47 is provided with, for example, a fitting portion 16 for connecting to the joint fixing portion 47. By providing the fitting portion 16 directly on the piece 15, a decrease in comfort when worn on the arm is suppressed even when the adjustment length using the band adjustment mechanism 1 is long.

[0047] As shown in FIG. 1 , a plurality of holes 28 are formed in the first side wall 24 and the second side wall 25 of the upper box 11. The holes 28 penetrate the first side wall 24 and the second side wall 25 in the width direction of the upper box 11. These holes 28 are holes for visually checking the position of the slider 4 when the slider 4 is slid. Through the holes 28, it is possible to visually check, for example, that the first fixing portion 43 or the standing wall 45 of the slider 4 passes when the slider 4 is slid. This allows the user to visually check the position of the slider 4 housed within the upper box 11 and easily determine the position of the slider 4.

[0048] The anchor 3 is connected to the upper box 11 via the shaft 34 so as to be able to open and close. The anchor 3 opens and closes between an open state that allows the slider 4 to slide and a closed state that restricts the slider 4 from sliding (see FIGS. 4 and 5). The anchor 3 can be operated when the clasp 10 is in the open state by the clasp opening and closing mechanism 13. When the clasp 10 is in the open state, the anchor 3 can be opened and closed independently of the opening and closing of the clasp 10. The anchor 3 has a lid portion 31, protrusions 32 and 33, and an engagement portion .

[0049] The lid portion 31 is provided on the rear side of the engaging pipe 2 and the slider 4. The lid portion 31 is formed in a plate shape that covers the engaging pipe 2 and the slider 4 from the rear side in the closed state. When viewed from the side, the lid portion 31 is formed in an arc shape with the same curvature as the upper box 11. The shaft portion 34 of the lid portion 31, which is located on the second direction D2 side, is attached so as to be rotatable around an axis C3 extending along the width direction of the upper box 11. Both ends of the axis C3 are fixed to the first side wall 24 and the second side wall 25 of the upper box 11, respectively. The axis C3 of the anchor 3 is provided on the second direction D2 side of the sliding direction of the axis C2 of the engaging pipe 2.

[0050] The protrusions 32, 33 protrude from the anchor 3 toward the slider 4 when the anchor 3 is in a closed state. In this embodiment, a total of two protrusions 32, 33 are provided: a first protrusion 32 and a second protrusion 33. The first protrusion 32 and the second protrusion 33 are integrally formed with the lid portion 31. The first protrusion 32 and the second protrusion 33 are formed so as to extend across the entire width of the anchor 3. When the anchor 3 is in a closed state, each of the protrusions 32, 33 restricts the sliding of the slider 4.

[0051] Each of the protrusions 32, 33 is provided in the center in the sliding direction of the slider 4 when the anchor 3 is in the closed state. The first protrusion 32 and the second protrusion 33 are provided spaced apart from each other in the sliding direction. The second protrusion 33 is provided closer to the axis C3 than the first protrusion 32. Each of the protrusions 32, 33 forms at least two or more recesses on the surface of the anchor 3. In this embodiment, the first protrusion 32 and the second protrusion 33 are formed on the lid portion 31, thereby forming three recesses: a first recess 36, a second recess 37, and a third recess 38.

[0052] The first recess 36 is provided farther from the axis C3 than the first protrusion 32. When the anchor 3 is in the closed state, the surface of the first protrusion 32 facing the first direction D1 forms part of the first recess 36. A step 71 that is recessed even deeper than the first recess 36 is provided further toward the first direction D1 than the first recess 36. When the anchor 3 is in the closed state, the engaging pipe 2 fits into the step 71. When viewed from the side, the first recess 36 is formed larger than the first fixing portion 43 of the slider 4. When the first fixing portion 43 of the slider 4 fits into the first recess 36, the first fixing portion 43 is locked from both sides in the sliding direction by the engaging pipe 2 and the first protrusion 32. This restricts sliding of the slider 4.

[0053] The second recess 37 is provided between the first protrusion 32 and the second protrusion 33. When the anchor 3 is in a closed state, the surface of the first protrusion 32 facing the second direction D2 and the surface of the second protrusion 33 facing the first direction D1 form part of the second recess 37. When viewed from the side, the second recess 37 is formed larger than the first fixing portion 43 of the slider 4. When the first fixing portion 43 of the slider 4 fits into the second recess 37, the first fixing portion 43 is locked by the first protrusion 32 and the second protrusion 33 from both sides in the sliding direction. This restricts sliding of the slider 4.

[0054] The third recess 38 is provided between the second protrusion 33 and the shaft 34 of the anchor 3, which is formed around the axis C3. When the anchor 3 is in a closed state, the surface of the second protrusion 33 facing the second direction D2 and the surface of the shaft 34 facing the first direction D1 form part of the third recess 38. When viewed from the side, the third recess 38 is larger than the first fixing portion 43 of the slider 4. When the first fixing portion 43 of the slider 4 fits into the third recess 38, the first fixing portion 43 is locked by the second protrusion 33 and the shaft 34 from both sides in the sliding direction. This restricts sliding of the slider 4. Furthermore, by locking the first fixing portion 43, the shaft 34 prevents the slider 4 from separating from the upper box 11 in the second direction D2.

[0055] The engagement portion 35 engages with the engagement pipe 2 when the anchor 3 is in a closed state. In this embodiment, the engagement portion 35 has an extension portion 61 that protrudes from the lid portion 31 toward the slider 4, and a claw portion 62 provided at the tip of the extension portion 61. The claw portion 62 climbs over the engagement pipe 2 and engages with the engagement pipe 2, thereby maintaining the anchor 3 in a closed state. When the anchor 3 is in a closed state, a hook portion 63 is provided on the lid portion 31 on the first direction D1 side of the engagement portion 35. The user opens the anchor 3 by hooking a finger or the like on the hook portion 63 and pulling up the lid portion 31.

[0056] Next, a method for adjusting the length of the band using the above-described band adjustment mechanism 1 will be described in detail. Fig. 5 is a side cross-sectional view of the band adjustment mechanism 1 according to the first embodiment, showing the clasp 10 and anchor 3 in an open state. Fig. 6 is a side cross-sectional view of the band adjustment mechanism 1 according to the first embodiment, showing the slider 4 in the middle of sliding. Fig. 7 is a side cross-sectional view of the band adjustment mechanism 1 according to the first embodiment, showing the anchor 3 in a closed state again.

[0057] As shown in Fig. 4, before the length is adjusted and while the wristwatch 100a is worn on the user's wrist, the anchor 3 and clasp 10 are closed. In the example shown in Fig. 4, the slider 4 is in the initial position P0 at this time. In the initial position P0, the first fixing portion 43 of the slider 4 is inserted into the first recess 36 and engaged with the engaging pipe 2 and the first protrusion 32. This restricts the slider 4 from sliding.

[0058] To adjust the length, first, as shown in Figure 5, the user operates button unit 51 of clasp opening / closing mechanism 13 to open clasp 10. Opening clasp 10 exposes anchor 3 so that it can be operated. The user then places their finger on hook portion 63 of anchor 3 to transition anchor 3 from the closed state to the open state, thereby opening anchor 3.

[0059] Next, as shown in Fig. 6, the user slides the second band 15 along the second sliding direction D2. That is, the user pulls out the second band 15 from the upper box 11. At this time, the user determines the position of the slider 4 while visually checking the slider 4 through, for example, a plurality of holes 28 (see Fig. 2) formed in the side wall of the upper box 11.

[0060] As shown in Figure 7, after sliding the slider 4, the user again rotates the anchor 3 around the axis C3 to transition the anchor 3 from the open state to the closed state. More specifically, the user closes the anchor 3 by pushing the anchor 3 toward the upper box 11 until the engagement portion 35 of the anchor 3 engages with the engagement pipe 2. At this time, the slider 4 is operated to be positioned at the first position P1. At the first position P1, the first fixing portion 43 of the slider 4 is inserted into the second recess 37 and engages with the first protrusion 32 and the second protrusion 33.

[0061] By performing the above operations, slider 4 is moved from initial position P0 to first position P1, completing the adjustment for lengthening the band. When wearing wristwatch 100a, clasp 10 may then be closed.

[0062] In the above example, the procedure for lengthening the length of the band has been described in which the position into which the first fixing portion 43 of the slider 4 is inserted is moved from the first recess 36 to the second recess 37. However, for example, it may be moved from the first recess 36 to the third recess 38. Similarly, it may be moved from the second recess 37 to the third recess 38. Furthermore, if it is desired to shorten the band, the slider 4 may be slid in the first direction D1 after opening the anchor 3 in the above procedure.

[0063] (Action, effect) Next, the operation and effect of the band adjustment mechanism 1 and the clasp 10 will be described. According to the band adjustment mechanism 1 of this embodiment, the length between the first band 14 and the second band 15 can be adjusted by opening the anchor 3 and then sliding the slider 4. In this way, the band length can be adjusted by two simple operations: opening the anchor 3 and sliding the slider 4. This allows for a simple configuration and intuitive operation for the user. It also reduces the number of parts and cuts costs. Furthermore, by using the slider 4 to adjust the length, the overall device can be made thinner while maintaining its strength. The protrusions 32 and 33 form two or more recesses 36, 37, and 38 on the surface of the anchor 3, and the first fixing portion 43 of the slider 4 fits into one of the recesses 36, 37, and 38 to engage with the protrusions 32 and 33. By selecting a location from the multiple recesses 36, 37, and 38 into which the first fixing portion 43 fits, the length of the band can be adjusted to the user's desired length, thereby improving user operability. Furthermore, by engaging the engagement portion 35 of the anchor 3 with the engagement pipe 2 of the upper box 11, the anchor 3 can be closed, disabling the slider 4. This prevents malfunctions, such as accidentally operating the slider 4 when, for example, attaching or detaching the band from the user's body. Because the anchor 3 covers the slider 4 in the closed state, it protects the slider 4 from external impacts when not adjusting. This improves the durability of the band adjustment mechanism 1. Furthermore, the anchor 3 is configured to be rotatable with respect to the upper box 11 via the shaft portion 34 and is configured to be closed by engaging the engagement portion 35. In other words, no spring or other device is used to open or close the anchor 3. Therefore, compared to conventional technologies that use springs or other devices to open or close the anchor 3 to restrict sliding, this technology prevents malfunctions and reduced durability due to spring deterioration. Furthermore, it can be configured more simply than when using a spring. Therefore, it is possible to provide a band adjustment mechanism 1 that has a simple configuration, allows intuitive operation, and can improve the durability of parts involved in length adjustment compared to conventional techniques.

[0064] Because the engagement pipe 2 is rotatable, less force is required to engage and disengage the engagement portion 35 of the anchor 3 with the engagement pipe 2. A clicking sensation can also be provided when the engagement portion 35 and the engagement pipe 2 engage. This improves the ease of adjustment. Furthermore, because the engagement pipe 2 is rotatable, wear caused by friction between the engagement portion 35 and the engagement pipe 2 can be reduced. This improves the durability of the engagement pipe 2 and the anchor 3. Furthermore, because the anchor 3 is locked by the axis C2 and the engagement pipe 2 that rotates around the axis, the anchor 3 can be locked using relatively large parts compared to conventional techniques that use a spring or the like to lock the anchor 3. This improves the maintainability of the band adjustment mechanism 1.

[0065] The clasp 10 of this embodiment can achieve particularly remarkable effects when applied to the clasp 10 of a watch. Specifically, because the length adjustment mechanism is simple and formed with few components, it can provide a length adjustment function without compromising the appearance or design, even when applied to a small (thin) component such as the clasp 10 of a watch. Furthermore, even when the clasp 10 has functions other than the length adjustment function, such as opening and closing the clasp 10, the user can intuitively operate it. Furthermore, even when the clasp 10 is subjected to vibrations, impacts, etc., it can provide improved operability and durability compared to conventional techniques. Therefore, it is possible to provide a clasp 10 equipped with a band adjustment mechanism 1 that has a simple configuration, allows intuitive operation, and improves the durability of the parts involved in length adjustment compared to conventional techniques. Furthermore, it is possible to provide a band and a watch equipped with such a clasp 10.

[0066] The opening and closing of the anchor 3 is independent of the opening and closing of the clasp 10. This prevents the adjustment mechanism from being unintentionally operated when the clasp 10 is opened or closed, compared to conventional technology in which the rail 12 of the clasp 10 also serves as a locking mechanism for the slider 4. This prevents the adjustment mechanism from malfunctioning.

[0067] (Second embodiment) Next, a second embodiment of the present invention will be described. Fig. 8 is a side view of clasp 210 according to the second embodiment. Fig. 9 is a side cross-sectional view of band adjustment mechanism 201 showing clasp 210 according to the second embodiment in a closed state. Fig. 10 is a side cross-sectional view of band adjustment mechanism 201 showing clasp 210 and anchor 203 according to the second embodiment in an open state. Fig. 11 is a side cross-sectional view of band adjustment mechanism 201 showing anchor 203 according to the second embodiment in a further tilted state and slider 4 in a slid state. Fig. 12 is a side cross-sectional view of band adjustment mechanism 201 showing anchor 203 according to the second embodiment in a re-closed state. Fig. 13 is a perspective view showing the back surface of anchor 203 according to the second embodiment. The second embodiment differs from the first embodiment described above in that the operation of opening the anchor 203 and the operation of sliding the slider 4 are performed simultaneously.

[0068] 8 and 9, in the band adjustment mechanism 201 of the second embodiment, the anchor 203 has a lid portion 31, a single protrusion 233, an engagement portion 235, and a pressing portion 238. The protrusion 233 is provided in the center in the sliding direction of the slider 4 when the anchor 203 is in the closed state. By forming the single protrusion 233 on the lid portion 31, two recesses, a first recess 236 and a second recess 237, are provided on the surface of the anchor 203.

[0069] The first recess 236 is provided farther from the shaft 34 than the protrusion 233. The engaging pipe 2 fits into the first recess 236 when the anchor 203 is in a closed state. When the first fixing portion 43 of the slider 4 fits into the first recess 236, the first fixing portion 43 is locked by the engaging pipe 2 and the protrusion 233 from both sides in the sliding direction. This restricts the sliding of the slider 4. The second recess 237 is provided between the protrusion 233 and the shaft 34. When the first fixing portion 43 of the slider 4 enters the second recess 237, the first fixing portion 43 is locked from both sides in the sliding direction by the protrusion 233 and the shaft 34. This restricts the sliding of the slider 4.

[0070] The engaging portion 235 engages with the engaging pipe 2 when the anchor 203 is in the closed state. As shown in FIG. 13 , in this embodiment, the engaging portion 235 has a stem portion 235a that protrudes from the lid portion 31 toward the slider 4, and an umbrella portion 235b that is provided at the tip of the stem portion 235a. The umbrella portion 235b is formed in a truncated cone shape whose outer diameter decreases toward the tip. The umbrella portion 235b climbs over the engaging pipe 2 and engages with the engaging pipe 2, thereby maintaining the anchor 203 in the closed state. The engaging portion 235 is attached to the lid portion 31 by, for example, crimping.

[0071] 9, the pressing portion 238 is provided at the end of the lid portion 31 on the shaft portion 34 side in the longitudinal direction. The pressing portion 238 is provided on the back surface of the lid portion 31 when the anchor 203 is in the closed state. As the anchor 203 rotates from the closed state to the open state, the pressing portion 238 presses the slider 4 in the second direction D2 of the sliding direction, causing the slider 4 to slide in the second direction D2 (see also FIGS. 10 and 11).

[0072] The slider 4 of the second embodiment has an abutment portion 248 that abuts against the pressing portion 238 of the anchor 203. The configuration of the slider 4 of the second embodiment is the same as the configuration of the slider 4 of the first embodiment. However, in the second embodiment, the standing wall 45 functions as the abutment portion 248. 11, the pressing portion 238 of the anchor 203 in the open state abuts against the abutment portion 248 (standing wall 45), and the force from the anchor 203 is input to the slider 4 via the abutment portion 248. When pressed by the anchor 203, the slider 4 slides in the second direction D2.

[0073] As shown in FIGS. 8 and 9, the band adjustment mechanism 201 of this embodiment further includes a second fixing portion 272. The second fixing portion 272 is located closer to the second direction D2 in the sliding direction than the first fixing portion 43 of the slider 4. The second fixing portion 272 restricts the sliding of the slider 4 with a force weaker than that of the first fixing portion 43. A force weaker than that of the first fixing portion 43 means, for example, that the slider 4 is slidable, but that the force imparts weight at a predetermined timing during the sliding operation, compared to when the slider 4 is slid without load as in the first embodiment. Specifically, the second fixing portion 272 has a plurality of holes 274 (see FIG. 8) formed on the side surface of the upper box 11 and a lateral protrusion 275 (see FIG. 9) formed on the slider 4.

[0074] 8, a plurality of holes 274 are provided in the first side wall 24 and the second side wall 25 of the upper box 11. In this embodiment, two holes 274 are provided in each side wall. The plurality of holes 274 penetrate the first side wall 24 and the second side wall 25 along the width direction of the upper box 11. The plurality of holes 274 are provided on the second direction D2 side of the axis C2 of the engaging pipe 2 and the axis C3 of the anchor 203 in the sliding direction.

[0075] As shown in FIG. 9, the lateral protrusions 275 are provided on the side surfaces of the slider 4. The lateral protrusions 275 are biased from the side surfaces of the slider 4 toward each side wall of the upper box 11 and are engageable with the multiple holes 274. Specifically, when the first fixing portion 43 of the slider 4 is inserted into the first recess 236 (initial state P10 shown in FIG. 9), the lateral protrusions 275 engage with the hole 274a of the two holes 274 that is closer to the first direction D1 in the sliding direction. When the first fixing portion 43 of the slider 4 is inserted into the second recess 237 (engaged state P12 shown in FIG. 12), the lateral protrusions 275 engage with the hole 274b of the two holes 274 that is closer to the second direction D2 in the sliding direction.

[0076] Next, a method for adjusting the length of the band using the band adjustment mechanism 201 of the second embodiment will be described in detail with reference to FIGS.

[0077] As shown in Fig. 9, before the length is adjusted and while the wristwatch 100a is worn on the user's wrist, the anchor 203 and clasp 210 are closed. In the example shown in Fig. 9, the slider 4 is in the initial position P10 at this time. At the initial position P0, the first fixing portion 43 of the slider 4 is inserted into the first recess 236 and engages with the engaging pipe 2 and the protrusion 233. This restricts the slider 4 from sliding.

[0078] To adjust the length, first, as shown in FIG. 10 , button unit 51 of clasp opening / closing mechanism 13 is operated to open clasp 210. Opening clasp 210 exposes anchor 203 so that it can be operated. The user then places their finger on anchor 203 to transition anchor 203 from the closed state to the open state. When anchor 203 is rotated approximately 90° from the closed state, pressing portion 238 of anchor 203 comes into contact with contact portion 248 of slider 4.

[0079] Next, as shown in Fig. 11, the user further rotates the anchor 203 toward the second direction D2 from the state in which it is rotated approximately 90° shown in Fig. 10. At this time, the abutting portion 248 of the slider 4 receives a force from the pressing portion 238 toward the second direction D2. As a result, the slider 4 slides in the second direction D2 as the anchor 203 opens. In other words, when the user performs an action to open the anchor 203, the action of opening the anchor 203 and the action of sliding the slider 4 in the second direction D2 are performed simultaneously. At this time, the lateral protrusion 275 of the second fixing portion 272 disengages from the hole 274a (see FIG. 8) on the first direction D1 side and engages with the hole 274b (see FIG. 8) on the second direction D2 side. The lateral protrusion 275 engages with the hole 274b on the second direction D2 side, thereby positioning the slider 4 in the sliding direction. In addition, the user can confirm that the positioning of the slider 4 has been completed by hearing a click or the like when the lateral protrusion 275 engages with the hole 274b on the second direction D2 side.

[0080] As shown in Figure 12, after the slider 4 has slid, the user again rotates the anchor 203 around the axis C3 to transition the anchor 203 from the open state to the closed state. More specifically, the user closes the anchor 203 by pushing the anchor 203 toward the upper box 11 until the engagement portion 235 of the anchor 203 engages with the engagement pipe 2. At this time, the slider 4 is located at the engagement position P12. At the engagement position P12, the first fixing portion 43 of the slider 4 is inserted into the second recess 237 and engages with the protrusion 233 and the shaft portion 34.

[0081] By performing the above operations, the slider 4 is moved from the initial position P10 to the engagement position P12, and the adjustment for lengthening the band is completed. When wearing the wristwatch 100a, the clasp 210 can then be further closed.

[0082] In the above example, the procedure for lengthening the band by moving the slider 4 in the second direction D2 has been described. However, the length of the band may also be shortened by moving the slider 4 in the first direction D1, for example. When moving the slider 4 in the first direction D1, the length of the band can be shortened by manually pushing the second band 15 toward the upper box 11 along the first direction D1 after opening the anchor 203 as shown in FIG. 10. In addition, in the second embodiment described above, the anchor 203 is configured to have one protrusion 233, but it may have multiple protrusions as in the first embodiment.

[0083] According to the band adjustment mechanism 201 of the second embodiment, the anchor 203 has a pressing portion 238, and the slider 4 has an abutting portion 248. When the anchor 203 is rotated from the closed state to the open state, the pressing portion 238 of the anchor 203 abuts against the abutting portion 248 of the slider 4, causing the slider 4 to slide in a predetermined direction. This allows the opening and closing operation of the anchor 203 and the sliding operation of the slider 4 to be performed simultaneously. In other words, adjustment can be performed with a single touch. This eliminates the user's effort in adjusting the length of the band, further improving the operability of the band adjustment mechanism 201.

[0084] The band adjustment mechanism 201 has a second fixing portion 272. The second fixing portion 272 restricts the sliding movement of the slider 4 with a force weaker than that of the first fixing portion 43. A force weaker than that of the first fixing portion 43 means, for example, that the slider 4 is still slidable, but that applies a weight at a predetermined timing during the sliding operation compared to when the slider 4 is slid without load. This allows, for example, a clicking sensation to be imparted depending on the sliding position, and the length to be adjusted in stages. This further improves user operability.

[0085] The second fixing portion 272 includes a plurality of holes 274 and a lateral protrusion 275. The lateral protrusion 275 of the slider 4 engages with the plurality of holes 274 provided on the side surface of the upper box 11. The lateral protrusion 275 is biased toward the side surface, so when the lateral protrusion 275 is positioned between the plurality of holes 274, it is pressed toward the side opposite the side surface, facilitating the sliding movement. On the other hand, when the lateral protrusion 275 is positioned so as to overlap with the hole 274, the lateral protrusion 275 engages with the hole 274, and the sliding movement is restricted by a weak force. This provides a clicking sensation when the slider 4 slides, and the length can be adjusted in stages.

[0086] The technical scope of the present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the spirit of the present invention. For example, in the second embodiment described above, the pressing portion 238 of the anchor 203 may be configured to press the slider 4 in a direction that shortens the length of the band, for example.

[0087] In the first embodiment, the anchor 3 may have one or three or more protrusions. In the second embodiment, the anchor 203 may have two or more protrusions.

[0088] The length adjustment mechanism may be provided somewhere other than the clasp 10, 210 of a wristwatch. For example, it may be provided at the connection between the watch body and the band of the wristwatch. It may also be provided on devices other than wristwatches that are worn (wrapped) around the body.

[0089] In addition, within the scope of the spirit of the present invention, the components in the above-described embodiments may be replaced with well-known components as appropriate, and the above-described embodiments may be combined as appropriate. [Explanation of symbols]

[0090] 1,201 Band adjustment mechanism 2 Engagement pipe 3,203 anchor 4 Slider 10,210 Nakatome 10a Watch body 11 Upper box 14 First Band 15 Second band (piece) 32 First convex part (convex part) 33 Second convex part (convex part) 34 Shaft 35,235 Engagement part 36,236 First recess (recess) 37,237 Second recess (recess) 38 Third recess (recess) 43 First fixed part 100a watch 233 Convex 238 Pressing section 248 Contact part 272 Second fixed part 274 (multiple) holes 275 Lateral process C2 (Connecting pipe) shaft

Claims

1. an upper box connected to the first band; a slider connected to the second band and sliding relative to the upper box along the longitudinal direction of the upper box; an engagement pipe provided on the upper box and extending in a direction intersecting the sliding direction of the slider; an anchor that is openably and closably connected to the upper box via a shaft portion, that opens and closes between an open state that allows the slider to slide and a closed state that restricts the slider to slide, and that has an engagement portion that engages with the engagement pipe in the closed state; at least one protrusion that protrudes from the anchor toward the slider, forms at least two recesses on a surface of the anchor, and restricts sliding of the slider when the anchor is in the closed state; a first fixing portion that protrudes from the slider toward the anchor and engages with the protrusion to restrict sliding of the slider; Equipped with a band adjustment mechanism.

2. The band adjustment mechanism according to claim 1 , wherein the engaging pipe rotates about an axis extending in a direction intersecting the sliding direction of the slider.

3. the anchor has a pressing portion that moves the slider in the sliding direction away from the first band as the slider rotates from the closed state to the open state, 3. The band adjustment mechanism according to claim 1, wherein the slider has an abutment portion that abuts against the pressing portion of the anchor.

4. The band adjustment mechanism according to claim 3, further comprising a second fixing portion that is disposed in a direction away from the first band in the sliding direction relative to the first fixing portion and that restricts the sliding of the slider with a force weaker than that of the first fixing portion.

5. The band adjustment mechanism according to claim 4, wherein the second fixing portion includes a plurality of holes formed in a side surface of the upper box, and a lateral protrusion formed on the slider, biased toward the side surface, and engaging with the holes.

6. A clasp for a watch, which is provided with the band adjustment mechanism according to any one of claims 1 to 4.

7. 7. The clasp according to claim 6, wherein the anchor can be opened and closed independently of the opening and closing of the clasp when the clasp is in an open state.

8. A band equipped with the clasp according to claim 6 or 7.

9. The watch body and The band according to claim 8 connected to the watch body; A watch equipped with.

Images