Band attachment device and watch

Abstract

To provide a band fitting device that is excellent in adhesiveness to the arm, and can be appropriately displaced following the movement of the wrist and the arm, and to provide a watch equipped with the same.SOLUTION: A band fitting device includes: a band fitting part 8 provided with a fitting hole 8a; a soft synthetic resin buffer member 9 disposed on both sides of the band fitting part 8, which is provided with a buffer hole 12a; a band 2 disposed on both sides of the buffer member 9, which is provided with a band hole 2c; and a fastening member 10 inserted into the fitting hole 8a through the band hole 2c and the buffer hole 12a so as to be displaced at least in an inner diameter direction of the fitting hole 8a, which fits the band 2 to the band fitting part 8 together with the buffer member 9. Therefore, a wrist watch case 1 can be brought into close contact with the arm by the elasticity of the buffer member 9. By displacing the fastening member 10 in the fitting hole 8a of the band fitting part 8 by the elasticity of the buffer member 9, an end part 2a of the band 2 can be appropriately displaced following the movement of the wrist and the arm.SELECTED DRAWING: Figure 6

Description

[Technical field]

[0001] The present invention relates to a band attachment device used for bands of watches, bags, purses, clothing, etc., and to a timepiece equipped with the same. [Background technology]

[0002] For example, in the case of wristwatches, as described in Patent Document 1, a band attachment device is known in which an end of a band made of soft synthetic resin is positioned between the band attachment parts of the wristwatch case, with a reinforcing member made of a hard material interposed therebetween, and in this state, the end of the band and the reinforcing member are attached to the band attachment parts with two pin members. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2015-136547 A

[0004] This type of band attachment device has a structure in which a reinforcing member made of a hard material is placed between the band attachment parts of the watch case, and this reinforcing member is fitted into a recess provided in the end of the band, and in this state the end of the band and the reinforcing member are attached to the band attachment parts using two pin members. Summary of the Invention [Problem to be solved by the invention]

[0005] In this type of band attachment device, the ends of the band, which are made of a soft synthetic resin, are firmly fixed and attached between the band attachment parts by reinforcing members made of a hard material, so when the wrist or arm is moved, the ends of the band simply elastically deform relative to the band attachment parts, and the band attachment device cannot be sufficiently displaced to follow the movement of the wrist or arm.

[0006] The problem to be solved by this invention is to provide a band attachment device which fits well on the arm and can be displaced well to follow the movement of the wrist or arm, and a watch equipped with the same. [Means for solving the problem]

[0007] This invention includes a band attachment part having a first hole formed therein, a buffer member disposed on both sides of the band attachment part and having a second hole formed therein, a band formed of a material harder than the buffer member, disposed on both sides of the outside of the buffer member and having a third hole formed therein, and a fastening member that passes through the third hole, the second hole, and the first hole to attach the band together with the buffer member to the band attachment part. the second hole of the buffer member is formed across a side portion of the buffer member and a spacer provided on the inside of the side portion, the spacer of the buffer member is disposed inside one side of the first hole of the band attachment portion, and the fastening member is disposed inside the other side of the first hole of the band attachment portion with a gap between an inner peripheral surface of the first hole of the band attachment portion and an outer peripheral surface of the fastening member. The band attachment device is characterized by the above. Effect of the Invention

[0008] According to this invention, the band fastening device can be moved with good adhesion to the arm and can be moved in a good manner to follow the movement of the wrist or arm. [Brief description of the drawings]

[0009] [Figure 1] 1 is an enlarged perspective view showing a first embodiment in which the present invention is applied to a wristwatch. [Diagram 2] FIG. 2 is an enlarged front view of the wristwatch shown in FIG. [Diagram 3] FIG. 2 is an enlarged side view of the wristwatch shown in FIG. [Figure 4] FIG. 2 is an enlarged rear view of the wristwatch shown in FIG. [Diagram 5] 2 is an exploded, enlarged perspective view showing the main parts of the wristwatch shown in FIG. 1. [Figure 6] 2 is an enlarged cross-sectional view showing a main part of the wristwatch band fastening device shown in FIG. 1, taken along the line AA. [Figure 7] 6A, 6B, 6C, 6D, and 6E show the buffer member of the band attachment device shown in FIG. 5, in which (a) is an enlarged front view, (b) is an enlarged rear view, (c) is an enlarged front view, (d) is an enlarged side view, and (e) is an enlarged back view. [Figure 8] FIG. 11 is an enlarged cross-sectional view showing the main parts of a second embodiment in which the present invention is applied to a wristwatch. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] (First embodiment) A first embodiment in which the present invention is applied to a wristwatch will be described below with reference to Figs. 1 to 7. As shown in Figures 1 to 4, this wristwatch has a wristwatch case 1. Band attachment devices 3 for attaching a band 2 to the wristwatch case 1 are provided on the 12 o'clock and 6 o'clock sides of this wristwatch case 1. Additionally, switch sections 4 are provided on the 2 o'clock, 3 o'clock, 4 o'clock, 8 o'clock, and 10 o'clock sides of this wristwatch case 1.

[0011] In this case, the wristwatch case 1 comprises a case body 1a and first and second exterior members 1b and 1c, as shown in Fig. 5. The case body 1a is made of metal or hard synthetic resin. The first exterior member 1b is made of metal or soft synthetic resin such as urethane resin, and is disposed on the upper outer periphery of the case body 1a, covering it.

[0012] 1 to 5, the second exterior member 1c is formed of metal or soft synthetic resin such as urethane resin, similar to the first exterior member 1b. This second exterior member 1c is arranged on each of the 3 o'clock and 9 o'clock sides of the case main body 1a, covering the lower part of the first exterior member 1b, and in this state is attached to the side parts of the case main body 1a with a plurality of screws 1d, so as to press the first exterior member 1b against the side parts of the case main body 1a.

[0013] A crystal 5 is attached to the upper opening of wristwatch case 1, as shown in Figures 1, 2, and 5. A back cover 6 is attached to the bottom of wristwatch case 1, as shown in Figures 3 and 4. A pulse sensor 6a that optically measures pulse is provided protruding downwards in the center of back cover 6.

[0014] A clock module 7 is provided inside wristwatch case 1, as shown in Fig. 5. Although not shown, clock module 7 includes various parts necessary for clock functions, such as a clock movement that drives the hands, a display unit that electro-optically displays information such as the time and date, and a circuit unit that electrically drives these.

[0015] As shown in Figures 5 and 6, the band attachment device 3 comprises a band attachment portion 8 provided on the case body 1a of the watch case 1, a band 2 attached to this band attachment portion 8, a cushioning member 9 interposed between the band attachment portion 8 and the band 2, and a fastening member 10 that attaches the band 2 together with the cushioning member 9 to the band attachment portion 8.

[0016] 5 and 6, band attachment portion 8 is a protrusion provided on the side of case body 1a of watch case 1, and is formed so that its length in the width direction perpendicular to the longitudinal direction of band 2 is shorter than the length in the width direction of band 2. In addition, band attachment portion 8 is provided with attachment hole 8a penetrating band 2 in the width direction.

[0017] 6, the mounting hole 8a is configured so that the first and second shaft portions 17, 21 of the fastening member 10, which will be described later, can be inserted therein so as to be displaceable at least in the direction of the inner diameter. That is, the mounting hole 8a has an inner diameter that is sufficiently larger than the shaft diameters of the first and second shaft portions 17, 21 of the fastening member 10, for example, approximately twice the shaft diameters of the first and second shaft portions 17, 21 of the fastening member 10.

[0018] 1 to 6, band 2 is made of elastic synthetic resin such as fluororesin, urethane resin, silicone resin, etc. Band 2 is formed so that end 2a attached to band attachment part 8 of wristwatch case 1 becomes gradually thicker toward the tip side of band attachment part 8, and is formed with a generally uniform thickness except for end 2a.

[0019] 5 and 6, an end 2a of the band 2 is provided with a pair of protrusions 2b that are arranged on both sides of the band mounting portion 8 via buffer members 9. The pair of protrusions 2b are provided with band holes 2c into which first and second shaft portions 17, 21 of a fastening member 10, which will be described later, are inserted, and which correspond to the same axis as the mounting hole 8a of the band mounting portion 8. The pair of band holes 2c are formed so that their inner diameters are the same as or slightly smaller than the inner diameter of the mounting hole 8a of the band mounting portion 8.

[0020] As shown in Figs. 5 to 7, the cushioning member 9 is made of the same or softer synthetic resin as the band 2, such as a urethane resin or a silicone resin. The cushioning member 9 is made of a material softer than the band attachment portion 8. The band attachment portion 8 is made of the same metal or hard synthetic resin as the case main body 1a, and is therefore harder than the cushioning member 9 and the band 2. The cushioning member 9 includes a main body portion 11 disposed below the band attachment portion 8, and a pair of side portions 12 disposed between a pair of protruding pieces 2b provided on the end portion 2a of the band 2 and both side portions of the band attachment portion 8.

[0021] The main body 11 of the cushioning member 9 is formed in a substantially flat plate shape, as shown in Figs. 5 to 7. The end of the main body 11 on the wristwatch case 1 side is provided with a first pressing portion 11a that is disposed on the underside of the back cover 6 and presses the back cover 6 from below. The end of the main body 11 on the band 2 side is provided with a second pressing portion 11b that is disposed in a recess (not shown) between a pair of protruding pieces 2b on the end 2a of the band 2 and presses the end 2a of the band 2 from below. The second pressing portion 11b of the cushioning member 9 may be disposed in a through hole provided in the band 2 and exposed from the outside of the band 2.

[0022] As shown in Figures 5 and 7, the second pressing portion 11b is formed in a substantially triangular rod shape. The second pressing portion 11b has a plurality of notches 11c that cut into the inside of the second pressing portion 11b from the outer surface on the band 2 side. The plurality of notches 11c are formed to form a plurality of cavities in the second pressing portion 11b, thereby enhancing the cushioning properties of the second pressing portion 11b.

[0023] 5 to 7, a pair of side portions 12 of the cushioning member 9 are provided standing on both left and right sides of the main body portion 11. The pair of side portions 12 are configured to be positioned between a pair of protruding pieces 2b provided on the end portion 2a of the band 2 and both sides of the band mounting portion 8 when the first pressing portion 11a of the main body portion 11 is positioned below the band mounting portion 8.

[0024] 5 to 7, a pair of buffer holes 12a into which first and second shaft portions 17, 21 of a fastening member 10, which will be described later, are inserted are provided in the pair of side portions 12 so as to correspond coaxially to the mounting hole 8a provided in the band mounting portion 8. The pair of buffer holes 12a are formed so that their inner diameters are smaller than the inner diameter of the mounting hole 8a in the band mounting portion 8 and are substantially the same size as the respective shaft diameters of the first and second shaft portions 17, 21 of the fastening member 10.

[0025] In this case, as shown in Figures 5 to 7, a pair of cushioning spacers 13 are provided on each of the opposing surfaces of the pair of side portions 12, which are disposed in the mounting holes 8a of the band mounting portion 8. Each of the pair of cushioning spacers 13 is formed in a cylindrical shape from the same soft synthetic resin as the cushioning member 9. Each of the pair of cushioning spacers 13 is formed integrally with and coaxially corresponds to each of the cushioning holes 12a in each of the opposing surfaces of the pair of side portions 12.

[0026] 6, the inner diameter of the mounting hole 8a of the band mounting part 8 is sufficiently larger than the shaft diameters of the first and second shaft portions 17, 21 of the fastening member 10 described below, so a gap S1 is provided between the outer circumferential surfaces of the first and second shaft portions 17, 21 inserted into the mounting hole 8a and the inner circumferential surface of the mounting hole 8a. As a result, the pair of buffer spacers 13 are formed to be disposed within the mounting hole 8a of the band mounting part 8.

[0027] 6, the pair of buffer spacers 13 are provided coaxially within the mounting hole 8a with their outer diameters being the same as the inner diameter of the mounting hole 8a of the band mounting portion 8 and their inner diameters being the same as the inner diameters of the buffer holes 12a provided in the pair of side portions 12. The pair of buffer spacers 13 are also formed with their axial lengths being short, approximately 1 / 3 to 1 / 4 of the axial length of the mounting holes 8a of the band mounting portion 8.

[0028] As a result, as shown in Figure 6, when a pair of side portions 12 of a pair of buffer spacers 13 are positioned on both sides of band mounting portion 8 and inserted into mounting hole 8a of band mounting portion 8, the spacing between the inner ends of the pair of buffer spacers 13 is a wide length that is approximately 1 / 2 to 1 / 3 of the axial length of mounting hole 8a of band mounting portion 8.

[0029] 5 and 6, fastening member 10 includes first threaded portion 14 and second threaded portion 15, and is configured to be disposed within mounting hole 8a of band mounting portion 8 so as to be displaceable at least in the inner radial direction. That is, first threaded portion 14 includes first head 16, first shank 17, and female threaded portion 18, and female threaded portion 18 is provided at the end of first shank 17 located opposite first head 16.

[0030] 6, the first head 16 has an outer diameter substantially the same as the outer diameter of the band attachment part 8 corresponding to the attachment hole 8a, and is formed so as to be disposed within one of the counterbore parts 2d provided on the outer side of each of the pair of protruding pieces 2b of the band 2. The first shaft part 17 includes a first large diameter shaft part 17a and a first small diameter shaft part 17b.

[0031] 6, the first large diameter shaft portion 17a has a shaft diameter substantially equal to the inner diameter of each band hole 2c provided in the pair of protruding pieces 2b of the band 2, and an axial length substantially equal to the axial length of each band hole 2c in the pair of protruding pieces 2b. The first small diameter shaft portion 17b has a shaft diameter smaller than that of the first large diameter shaft portion 17a, and a first step portion 17c is provided at the boundary with the first large diameter shaft portion 17a.

[0032] 6, the first small diameter shaft portion 17b is formed to have approximately the same size as the inner diameters of the buffer holes 12a provided in the pair of side portions 12 of the buffer member 9 and the pair of buffer spacers 13. Furthermore, the first small diameter shaft portion 17b has an axial length extending from the outer end faces of the pair of side portions 12 to the vicinity of the middle portion of the mounting hole 8a of the band mounting portion 8.

[0033] 6, a female thread 18 is provided on the inner end of the first shaft portion 17, i.e., the inner end of the first small diameter shaft portion 17b. The female thread 18 is a screw hole, and is formed with an outer diameter equal to the shaft diameter of the first small diameter shaft portion 17b and an inner diameter smaller than the shaft diameter of the first small diameter shaft portion 17b. The female thread 18 is also formed with an axial length substantially equal to the axial length of each of the buffer holes 12a in the pair of side portions 12 of the buffer member 9.

[0034] 5 and 6, the second screw portion 15 includes a second head portion 20, a second shaft portion 21, and a male screw portion 22, with the male screw portion 22 being provided at the end of the second shaft portion 21 located opposite the second head portion 20. The second head portion 20, like the first head portion 16 of the first screw portion 14, has an outer diameter substantially the same as the outer diameter of the band attachment portion 8 corresponding to the attachment hole 8a, and is formed so as to be disposed within the other counterbore portion 2d provided on the outer side of each of the pair of protruding pieces 2b of the band 2.

[0035] 6, the second shaft portion 21 includes a second large diameter shaft portion 21a and a second small diameter shaft portion 21b, similar to the first shaft portion 17. Similar to the first large diameter shaft portion 17a, the second large diameter shaft portion 21a is formed with a shaft diameter approximately equal to the inner diameter of each band hole 2c provided in the pair of protruding pieces 2b of the band 2, and an axial length approximately equal to the axial length of each band hole 2c in the pair of protruding pieces 2b.

[0036] 6, the second small diameter shaft portion 21b is formed to have a shaft diameter smaller than that of the second large diameter shaft portion 21a, similar to the first small diameter shaft portion 17b, and a second step portion 21c is provided at the boundary with the second large diameter shaft portion 21a. In addition, the second small diameter shaft portion 21b is formed to have approximately the same size as the inner diameters of the buffer holes 12a provided in the pair of side portions 12 of the buffer member 9 and the pair of buffer spacers 13.

[0037] 6, like the first small diameter shaft portion 17b, the second small diameter shaft portion 21 has an axial length that extends from each outer end surface of the pair of side portions 12 to near the middle of the mounting hole 8a of the band mounting portion 8. A male thread portion 22 is provided on the inner end portion of the second shaft portion 21, i.e., the inner end portion of the second small diameter shaft portion 21b.

[0038] 6, the male thread portion 22 is a thread portion that screws into the female thread portion 18 of the first thread portion 14, and is formed with an outer diameter smaller than the outer diameter of the second small diameter shaft portion 21b and approximately the same as the inner diameter of the female thread portion 18. In addition, the male thread portion 22 is formed with an axial length that is approximately the same as the axial length of each of the buffer holes 12a in the pair of side portions 12 of the buffer member 9 and slightly shorter than the axial length of the female thread portion 18.

[0039] Next, the operation of this wristwatch band fastening device 3 will be described. When attaching the band 2 to the band attachment portion 8 with this band attachment device 3, first, the cushioning member 9 is attached to the band attachment portion 8. At this time, the main body portion 11 is bent so as to bend in a direction that separates the pair of cushioning spacers 13 provided on the pair of side portions 12 of the cushioning member 9. In this state, the pair of separated cushioning spacers 13 are inserted into the attachment hole 8a of the band attachment portion 8 from both sides.

[0040] Then, the main body 11 elastically returns to its original shape, and the pair of side portions 12 of the cushioning member 9 are pressed against both sides of the band attachment portion 8. This causes each of the cushioning holes 12a of the pair of side portions 12 and the pair of cushioning spacers 13 to be positioned coaxially with the attachment holes 8a of the band attachment portion 8. At this time, the main body 11 of the cushioning member 9 is positioned below the band attachment portion 8, and the first pressing portion 11a of this main body 11 is positioned on the underside of the outer periphery of the back cover 6 of the watch case 1, pressing the back cover 6 from below.

[0041] Then, the end 2a of the band 2 is attached to the band attachment part 8 with the cushioning member 9 interposed therebetween. At this time, the pair of protruding pieces 2b provided on the end 2a of the band 2 are placed on the outer surfaces of the pair of side parts 12 of the cushioning member 9, and the second pressing part 11b of the main body part 11 of the cushioning member 9 is placed in a recess (not shown) provided on the end 2a of the band 2.

[0042] As a result, the second pressing portion 11b of the main body 11 of the cushioning member 9 presses the end portion 2a of the band 2 from below. In this state, the band holes 2c provided in the pair of protruding pieces 2b of the band 2 are arranged coaxially with the cushioning holes 12a provided in the pair of side portions 12 of the cushioning member 9.

[0043] Then, the first screw portion 14 of the fastening member 10 is inserted from one of the band holes 2c provided in the pair of protrusion pieces 2b of the band 2 (the left side in Figure 6), and the second screw portion 15 of the fastening member 10 is inserted from the other of the band holes 2c provided in the pair of protrusion pieces 2b of the band 2 (the right side in Figure 6).

[0044] That is, the first screw portion 14 is inserted into one (left side in FIG. 6) band hole 2c of the pair of protruding pieces 2b of the band 2, and the first head portion 16 of the first screw portion 14 is disposed in the counterbore portion 2d of one (left side in FIG. 6) of the pair of protruding pieces 2b of the band 2. Then, the first large diameter shaft portion 17a of the first shaft portion 17 is inserted into the band hole 2c of one (left side in FIG. 6) of the pair of protruding pieces 2b of the band 2.

[0045] At this time, the first small diameter shaft portion 17b of the first shaft portion 17 is inserted into the buffer hole 12a on one (the left side in Figure 6) of the pair of side portions 12 of the buffer member 9, the buffer spacer 13 on the other (the left side in Figure 6), and the mounting hole 8a of the band mounting portion 8, and the female thread portion 18 is positioned near the middle of the mounting hole 8a of the band mounting portion 8.

[0046] Similarly, the second screw portion 15 is inserted into the other (right side in FIG. 6) band hole 2c of the pair of protruding pieces 2b of the band 2, and the second head portion 20 of the second screw portion 15 is disposed in the counterbore portion 2d of the other (right side in FIG. 6) of the pair of protruding pieces 2b of the band 2. Then, the second large diameter shaft portion 21a of the second shaft portion 21 is inserted into the other (right side in FIG. 6) band hole 2c of the pair of protruding pieces 2b of the band 2.

[0047] At this time, the second small diameter shaft portion 21b of the second shaft portion 21 is inserted into the other (right side in Figure 6) buffer hole 12a of the pair of side portions 12 of the buffer member 9, the other (right side in Figure 6) buffer spacer 13, and the mounting hole 8a of the band mounting portion 8, and the male thread portion 22 is positioned near the middle of the mounting hole 8a of the band mounting portion 8.

[0048] At this time, the male threaded portion 22 of the second threaded portion 15 is screwed into the female threaded portion 18 of the first threaded portion 14, and the first threaded portion 14 and the second threaded portion 15 are fastened together. Then, the first head portion 16 of the first threaded portion 14 and the second head portion 20 of the second threaded portion 15 elastically press the pair of protruding pieces 2b of the band 2 against the pair of side portions 12 of the buffer member 9, respectively.

[0049] Also, at this time, the first step portion 17c of the first large diameter shaft portion 17a in the first shaft portion 17 of the first screw portion 14 and the second step portion 21c of the second large diameter shaft portion 21a in the second shaft portion 21 of the second screw portion 15 elastically press the pair of side portions 12 of the buffer member 9 against both side portions of the band mounting portion 8, respectively.

[0050] As a result, the end 2a of the band 2 is attached to the band attachment part 8 via the buffer member 9 by the band attachment device 3. In this state, the first and second shaft portions 17, 21 of the fastening member 10 are disposed within the attachment hole 8a of the band attachment part 8 so as to be displaceable at least in the inner radial direction due to the elasticity of the buffer member 9.

[0051] Next, a case will be described where the wristwatch case 1, in which the end 2a of the band 2 is attached to the band attachment portion 8 by the band attachment device 3, is worn on the wrist and used. When wristwatch case 1 is attached to the wrist by band 2, wristwatch case 1 is attached in close contact with the wrist.

[0052] That is, because the end 2a of the band 2, the cushioning member 9, and the pair of cushioning spacers 13 are made of soft synthetic resin, the elasticity of the end 2a of the band 2, the cushioning member 9, and the pair of cushioning spacers 13 allows the wristwatch case 1 to be attached in close contact with the arm. In this state, the pulse sensor unit 6a provided in the center of the back cover 6 is pressed against the arm and in close contact. Therefore, when the pulse is optically measured by the pulse sensor unit 6a, the pulse can be measured accurately without being affected by external light.

[0053] Furthermore, when the arm to which watch case 1 is attached is bent or twisted, or the wrist is bent, the elasticity of end 2a of band 2, buffer member 9, and a pair of buffer spacers 13 causes fastening member 10 to elastically displace within mounting hole 8a of band mounting part 8 in three-dimensional directions: up-down, front-rear, and rear, which are the inner diameter directions, and in the diagonal directions relative to these directions. This causes end 2a of band 2 to displace in response to the movement of the arm or wrist.

[0054] In other words, the first and second shaft portions 17, 21 of the first and second threaded portions 14, 15 of the fastening member 10 are elastically held within the mounting hole 8a of the band mounting portion 8 by a pair of buffer spacers 13, with a gap S1 between the outer peripheral surfaces of the first and second shaft portions 17, 21 and the inner peripheral surface of the mounting hole 8a.

[0055] As a result, due to elastic deformation of the pair of protrusions 2b of band 2, the pair of side portions 12 of cushioning member 9, and the pair of cushioning spacers 13, the first and second shaft portions 17, 21 are displaced three-dimensionally within mounting hole 8a in the inner diameter direction, that is, in the up-down, front-rear and diagonal directions relative to these directions, in accordance with the movement of the arm or wrist.

[0056] In this case, the band 2 is formed from an elastic synthetic resin such as fluororesin, urethane resin, or silicone resin, and the cushioning member 9 and a pair of cushioning spacers 13 are formed from the same or a softer synthetic resin than the band 2, such as a urethane resin or silicone resin.

[0057] For this reason, when the first and second shaft portions 17, 21 are displaced within the mounting hole 8a in the three-dimensional directions, that is, in the up-down, front-rear and diagonal directions, which are the inner diameter directions of the mounting hole 8a, the pair of protrusion pieces 2b of the band 2, the pair of side portions 12 of the cushioning member 9, and the pair of cushioning spacers 13 elastically deform in response to the displacement of the first and second shaft portions 17, 21.

[0058] At this time, due to the multiple notches 11c provided in the second pressing portion 11b of the buffer member 9, the second pressing portion 11b easily elastically deforms in response to the displacement of the first and second shaft portions 17, 21. This makes it easier to elastically deform the end portion 2a and the pair of protruding pieces 2b of the band 2.

[0059] As a result, when the arm to which watch case 1 is attached is bent or twisted, or the wrist is bent, end 2a of band 2 can follow that movement and elastically displace in three dimensional directions, including the up-down direction, the front-back direction, and the diagonal directions relative to band attachment part 8. As a result, the movement of the arm or wrist to which watch case 1 is attached is not hindered by end 2a of band 2 and watch case 1, so the arm or wrist can be moved freely without being injured.

[0060] Thus, with this wristwatch band attachment device 3, there is provided a band attachment section 8 with attachment hole 8a, cushioning member 9 made of soft synthetic resin that is arranged on both sides of band attachment section 8 and has cushioning hole 12a arranged coaxially with attachment hole 8a, band 2 that is arranged on both sides of cushioning member 9 and has band hole 2c arranged coaxially with cushioning hole 12a, and fastening member 10 that is inserted into attachment hole 8a through band hole 2c and cushioning hole 12a so as to be displaceable at least in the inner radial direction, and attaches band 2 to band attachment section 8 together with cushioning member 9, so that it fits well against the arm and allows end 2a of band 2 to be displaced well in response to movements of the wrist and arm.

[0061] That is, in this wristwatch band attachment device 3, the cushioning member 9 interposed between the band attachment portion 8 and the end 2a of the band 2 is made of soft synthetic resin, so the elasticity of this cushioning member 9 allows the wristwatch case 1 to be attached in close contact with the arm, improving the fit. In this case, for example, the pulse sensor portion 6a provided in the center of the back cover 6 can be pressed against the arm to make it fit closely, so when the pulse sensor portion 6a optically measures the pulse, the pulse can be measured accurately without being affected by external light.

[0062] Furthermore, in the wristwatch band attachment device 3, the fastening member 10 is inserted into the attachment hole 8a of the band attachment portion 8 so that it can be displaced at least in the inner diameter direction, and therefore the elasticity of the buffer member 9 allows the fastening member 10 to be displaced within the attachment hole 8a of the band attachment portion 8 in three-dimensional directions, that is, the inner diameter direction, the up-down, front-rear directions, and each of these diagonal directions.

[0063] As a result, with this wristwatch band attachment device 3, end 2a of band 2 can be freely and satisfactorily displaced relative to band attachment part 8 in accordance with the movement of the wrist or arm. Because of this, the movement of the arm or wrist to which wristwatch case 1 is attached is not impeded by end 2a of band 2 and wristwatch case 1, so the arm or wrist can be moved freely without being injured.

[0064] In this case, in the band attachment device 3 of this wristwatch, the fastening member 9 is inserted into the attachment hole 8a with a gap S1 between its outer surface and the inner surface of the attachment hole 8a of the band attachment part 8, and this gap S1 allows the fastening member 10 to be displaced within the attachment hole 8a of the band attachment part 8 in three-dimensional directions, that is, the inner diameter direction, up and down, front and rear directions, and each of these diagonal directions, so that the end 2a of the band 2 can be freely and satisfactorily displaced relative to the band attachment part 8 in response to the movement of the wrist or arm.

[0065] Furthermore, in this wristwatch band attachment device 3, a buffer spacer 13 made of soft synthetic resin is disposed in the gap S1 between the outer circumferential surface of the fastening member 9 and the inner circumferential surface of the attachment hole 8a of the band attachment section 8, so that in the normal state, the axial center of the fastening member 9 and the axial center of the attachment hole 8a are aligned and elastically held by the buffer spacer 13. Furthermore, the elastic deformation of the buffer spacer 13 allows the fastening member 10 to be displaced within the attachment hole 8a of the band attachment section 8 in three-dimensional directions, namely, the up-down, front-rear direction, which is the inner diameter direction, and each of the diagonal directions therebetween.

[0066] Furthermore, in this wristwatch band attachment device 3, because the buffer spacer 13 is provided integrally with the buffer member 9, even if a pair of buffer spacers 13 is provided, they can be manufactured at the same time as the buffer member 9, thereby improving productivity and reducing the number of parts. Also, even though the buffer spacer 13 is provided integrally with the buffer member 9, because they are made of a soft synthetic resin, the buffer spacer 13 can be easily inserted and positioned in the attachment hole 8a of the band attachment part 8 with the buffer member 9 in a bent state.

[0067] In other words, the cushioning member 9 comprises a substantially plate-shaped main body 11 and a pair of side portions 12 erected on both the left and right sides of the main body 11, and a pair of cushioning spacers 13 are provided on the opposing surfaces of the pair of side portions 12. Therefore, by bending the main body 11 in a direction that separates the pair of cushioning spacers 13, the pair of separated cushioning spacers 13 can be easily inserted from both sides into the mounting hole 8a of the band mounting portion 8.

[0068] Furthermore, in the band attachment device 3 of this wristwatch, the band 2 is formed from a soft synthetic resin and the cushioning member 9 is formed from the same or a softer synthetic resin as the band 2, so that when the fastening member 10 is displaced within the attachment hole 8a of the band attachment section 8 in three dimensional directions, that is, in the up-down, front-rear and diagonal directions which are the inner diameter direction of the attachment hole 8a of the band attachment section 8, the end 2a of the band 2 can be elastically deformed together with the cushioning member 9, thereby allowing the fastening member 10 to be displaced well within the attachment hole 8a of the band attachment section 8.

[0069] Furthermore, in the band attachment device 3 of this wristwatch, the cushioning material 9 is provided with a plurality of cutouts 11c, thereby improving the cushioning properties of the cushioning material 9. That is, the plurality of cutouts 11c are a plurality of hollows that are provided in the main body 11 of the cushioning material 9 and bite into the second pressing portion 11b, which is formed in a substantially triangular rod shape that presses the end 2a of the band 2 from below, from the outer surface on the band 2 side toward the inside, thereby making it easier to elastically deform the second pressing portion 11b, and therefore easier to elastically deform the end 2a of the band 2.

[0070] Furthermore, in the band attachment device 3 of this wristwatch, the fastening member 10 is equipped with a first threaded portion 14 having a female threaded portion 18, and a second threaded portion 15 having a male threaded portion 22 that screws into the female threaded portion 18, so that by screwing the male threaded portion 22 of the second threaded portion 15 into the female threaded portion 18 of the first threaded portion 14 within the attachment hole 8a of the band attachment portion 8, the end 2a of the band 2 and the buffer member 9 can be pressed against both sides of the band attachment portion 8 for secure and good attachment.

[0071] In this case, the first screw portion 14 includes a first head portion 16, a first shaft portion 17, and a female thread portion 18, and the first shaft portion 17 is a first large diameter shaft. Department The second screw portion 15 has a second head 20, a second shaft portion 21, and a male screw portion 22, and the second shaft portion 21 is a second large diameter shaft Department By providing the second small diameter shaft portion 21a, the second small diameter shaft portion 21b, and the second step portion 21c, the end portion 2a of the band 2 and the buffer member 9 can be pressed against both side portions of the band attachment portion 8 reliably and satisfactorily.

[0072] In other words, when this fastening member 10 is tightened by screwing the male threaded portion 22 of the second threaded portion 15 into the female threaded portion 18 of the first threaded portion 14 within the mounting hole 8a of the band mounting portion 8, the first and second heads 16, 20 of the first and second threaded portions 14, 15 elastically press the pair of protrusions 2b at the end 2a of the band 2 against the pair of side portions 12 of the buffer member 9, respectively, and the first and second step portions 17c, 21c of the first and second shaft portions 17, 21 of the first and second threaded portions 14, 15 elastically press the pair of side portions 12 of the buffer member 9 against both side portions of the band mounting portion 8, respectively, so that the end 2a of the band 2 and the buffer member 9 can be reliably and satisfactorily attached to the band mounting portion 8.

[0073] In this case, when this fastening member 10 is tightened by screwing the male threaded portion 22 of the second threaded portion 15 into the female threaded portion 18 of the first threaded portion 14 within the mounting hole 8a of the band mounting portion 8, the tightening force can be adjusted to adjust the pressing condition in which the end 2a of the band 2 together with the buffer member 9 is pressed against both sides of the band mounting portion 8, thereby allowing the end 2a of the band 2 to be attached by being pressed against both sides of the band mounting portion 8 together with the buffer member 9 in an optimal condition.

[0074] In the above-mentioned first embodiment, the buffer spacer 13 is integrally formed with the pair of side portions 12 of the buffer member 9, but the buffer spacer 13 may be a separate member. If the buffer spacer 13 is a separate member, it may be disposed over the entire axial length of the mounting hole 8a of the band mounting portion 8. In addition, in the above-mentioned embodiment, a pair of buffer spacers 13 is provided on the opposing surfaces of the pair of side portions 12 of the buffer member 9, and the pair of buffer spacers 13 is disposed in the mounting hole 8a of the band mounting portion 8, but the present invention does not necessarily require the provision of a pair of buffer spacers 13.

[0075] Second embodiment Next, a second embodiment in which the present invention is applied to a wristwatch will be described with reference to Fig. 8. Note that the same parts as those in the first embodiment shown in Figs. 1 to 7 are denoted by the same reference numerals. As shown in Figure 8, this wristwatch band attachment device 3 does not have the pair of cushioning spacers 13 of the first embodiment, and instead has an attachment hole 25 of the band attachment portion 8 whose inner diameter gradually increases from the middle portion 25a of the attachment hole 25 toward both ends 25b of the attachment hole 25; otherwise, the structure is substantially the same as that of the first embodiment.

[0076] 8, the inner diameter of the middle portion 25a of the mounting hole 25 of the band mounting portion 8 is larger than the shaft diameter of the fastening member 10, and is, for example, the same as or slightly smaller than the inner diameter of the mounting hole 8a of the first embodiment. Also, the inner diameter of both side portions 25b of the mounting hole 25 is larger than the inner diameter of the middle portion 25a.

[0077] As a result, the mounting hole 25 has a tapered inner circumferential surface such that the inner diameter gradually increases from the middle portion 25a toward both end portions 25b, as shown in Fig. 8. Therefore, the fastening member 10 has the first and second shaft portions 17, 21 arranged with a gap S2 between the outer circumferential surfaces of the first and second shaft portions 17, 21 inserted into the mounting hole 25 and the inner circumferential surface of the mounting hole 25.

[0078] In this case, gap S2 is formed so that when the axial centers of first and second shaft portions 17, 21 inserted into mounting hole 25 are aligned with the axial center of mounting hole 25, the gap S2 is narrowest at a location located at intermediate portion 25a of mounting hole 25 and gradually widens from intermediate portion 25a toward both end portions 25b of mounting hole 25. As a result, first and second shaft portions 17, 21 of fastening member 10 are inserted into mounting hole 8a of band mounting portion 8 so as to be displaceable at least in the inner radial direction.

[0079] Next, the operation of the band fastening device 3 of the second embodiment will be described. When wristwatch case 1 is attached to the arm using band 2, as in the first embodiment, end 2a of band 2 and cushioning member 9 are made of soft synthetic resin, and the elasticity of end 2a of band 2 and cushioning member 9 allows wristwatch case 1 to be attached in a tight fit to the arm.

[0080] Furthermore, when the arm to which watch case 1 is attached is bent or twisted, or the wrist is bent, the elasticity of end 2a of band 2 and pair of side portions 12 of cushioning member 9 causes fastening member 10 to elastically displace within attachment hole 25 of band attachment portion 8 in three-dimensional directions, including the up-down, front-rear direction, which is the inner diameter direction, and the diagonal directions therebetween, due to the elasticity of end 2a of band 2 and pair of side portions 12 of cushioning member 9. This causes end 2a of band 2 to displace in response to the movement of the arm or wrist.

[0081] In other words, when the first and second shaft portions 17, 21 of the first and second threaded portions 14, 15 of the fastening member 10 are positioned within the mounting hole 25 of the band mounting portion 8, a gap S2 is formed between the outer peripheral surfaces of the first and second shaft portions 17, 21 and the inner peripheral surface of the mounting hole 25. Therefore, due to elastic deformation of the pair of protrusions 2b of the band 2 and the pair of side portions 12 of the cushioning member 9, the first and second shaft portions 17, 21 are displaced in three-dimensional directions, including the inner diameter direction within the mounting hole 25, that is, the up-down, front-rear and rear directions, and each of the diagonal directions therebetween, in accordance with movement of the arm or wrist, more than in the first embodiment.

[0082] In this case, when the first and second shaft portions 17, 21 are displaced within the mounting hole 25 in the three-dimensional directions of the inner diameter, that is, the up-down, front-rear, and each of the diagonal directions, the pair of protrusions 2b of the band 2 and the pair of side portions 12 of the cushioning member 9 elastically deform in response to the displacement of the first and second shaft portions 17, 21, as in the first embodiment.

[0083] At this time, similarly to the first embodiment, the second pressing portion 11b of the cushioning member 9 is easily elastically deformed following the displacement of the first and second shaft portions 17, 21 due to the multiple notches 11c provided in the second pressing portion 11b. This makes it easier to elastically deform the end portion 2a and the pair of protruding pieces 2b of the band 2.

[0084] As a result, when the arm to which watch case 1 is attached is bent or twisted, or the wrist is bent, just like in the first embodiment, end 2a of band 2 can be elastically displaced in three dimensional directions, including the up-down direction, the front-back direction, and the diagonal directions relative to band attachment part 8, following the movement. Therefore, the movement of the arm or wrist to which watch case 1 is attached is not impeded by end 2a of band 2 and watch case 1, so the arm or wrist can be moved freely without being injured.

[0085] Thus, according to the band attachment device 3 of the second embodiment, in addition to having the same effects as the first embodiment, the inner circumferential surface of the attachment hole 25 of the band attachment portion 8 is formed so that the inner diameter of the attachment hole 25 gradually increases from the middle portion 25a of the attachment hole 25 toward both ends 25b of the attachment hole 25, which makes it easier to displace the fastening member 10 in the three-dimensional directions, that is, the up-down and front-rear directions, which are the inner diameter directions, and the diagonal directions therebetween, than in the first embodiment. This allows the end portion 2a of the band 2 to be displaced satisfactorily in accordance with the movement of the wrist or arm.

[0086] In the above-mentioned second embodiment, the case where the inner diameter of the intermediate portion 25a of the mounting hole 25 is formed sufficiently larger than the shaft diameter of the fastening member 10 is described. However, the present invention is not limited to this, and the inner diameter of the intermediate portion 25a of the mounting hole 25 may be the same as the shaft diameter of the fastening member 10 or slightly larger than that.

[0087] In the above-mentioned first and second embodiments, the second pressing portion 11b of the cushioning member 9 is provided with a plurality of cutouts 11c to form a plurality of cavities in the second pressing portion 11b, but the present invention is not limited to this, and the cutouts 11c do not have to be a plurality, and one cavities may be formed. The cavities in the second pressing portion 11b may be formed so as not to be visible from the outside of the cushioning member 9. The second pressing portion 11b of the cushioning member 9 does not have to have the cutouts 11c.

[0088] In addition, in the first and second embodiments described above, the first and second shank portions 17, 21 of the first and second threaded portions 14, 15 in the fastening member 10 are described as having first and second large diameter shank portions 17a, 21a and first and second small diameter shank portions 17b, 21b. However, the present invention is not limited to this, and for example, the first and second shank portions may be formed with the same shank diameter.

[0089] Furthermore, in the above-described first and second embodiments, the cases have been described in which each band hole 2c formed in a pair of protruding pieces 2b of band 2 is formed larger than the buffer holes 12a formed in a pair of side portions 12 of buffer member 9. However, the present invention is not limited to this, and band holes 2c may be formed so that their inner diameters are the same as the inner diameters of buffer holes 12a.

[0090] Furthermore, in the above-mentioned first and second embodiments, the band 2 is made of soft synthetic resin, but the present invention is not limited to this, and the band may be made of metal.

[0091] Furthermore, in the first and second embodiments described above, the invention is described as being applied to a wristwatch, but the invention does not necessarily have to be applied to a wristwatch, but can also be applied to bands for bags, purses, clothing, etc.

[0092] Although several embodiments of the present invention have been described above, the present invention is not limited to these and includes the inventions described in the claims and their equivalents. The invention as set forth in the claims of this application is set forth below.

[0093] (Additional Note) The invention described in claim 1 is a band mounting device comprising: a band mounting portion having a mounting hole; a cushioning member made of soft synthetic resin arranged on both sides of the band mounting portion and having a cushioning hole formed coaxially with the mounting hole; a band arranged on both sides of the cushioning member and having a band hole formed coaxially with the cushioning hole; and a fastening member inserted into the mounting hole through the band hole and the cushioning hole so as to be displaceable at least in the inner radial direction of the mounting hole, and which attaches the band together with the cushioning member to the band mounting portion.

[0094] The invention described in claim 2 is a band mounting device described in claim 1, characterized in that the fastening member is inserted into the mounting hole with a gap between the outer peripheral surface of the fastening member and the inner peripheral surface of the mounting hole of the band mounting portion.

[0095] The invention described in claim 3 is the band attaching device described in claim 2, characterized in that a cushioning spacer made of soft synthetic resin is arranged in the gap.

[0096] The invention described in claim 4 is a band attaching device described in any one of claims 1 to 3, characterized in that the fastening member is inserted into the attachment hole of the band attaching portion without contacting the attachment hole.

[0097] The invention recited in claim 5 is the band attaching device recited in claim 3, characterized in that the buffer spacer is provided integrally with the buffer member.

[0098] The invention described in claim 6 is a band mounting device described in claim 1, characterized in that the mounting hole of the band mounting portion is formed in a shape such that the inner diameter gradually increases from the middle of the mounting hole toward both ends of the mounting hole.

[0099] The invention described in claim 7 is a band attaching device described in any one of claims 1 to 6, characterized in that the band is formed from a soft synthetic resin, and the cushioning member is formed from the same soft synthetic resin as the band or a softer softer synthetic resin.

[0100] The invention as set forth in claim 8 is the band attaching device as set forth in any one of claims 1 to 7, characterized in that a cutout portion is provided in the buffer member.

[0101] The invention recited in claim 9 is a timepiece comprising a band attachment device recited in any one of claims 1 to 8. [Explanation of symbols]

[0102] 1 watch case 2 Bands 2a end 2b Projection piece 2c Band hole 3 Band attachment device 8 Band attachment part 8a, 25 mounting holes 9. Cushioning materials 10 Fastening members 11 Main body 12 Side 12a buffer hole 13 Buffer spacer 14, 15 First and second screw parts 16, 20 1st and 2nd head 17, 21 First and second shafts 18 Female thread 22 Male thread

Claims

1. a band attachment portion having a first hole formed therein; a buffer member disposed on each side of the band attachment portion and having a second hole formed therein; a band formed of a material harder than the buffer member, disposed on both sides of the outside of the buffer member, and having a third hole formed therein; a fastening member that passes through the third hole, the second hole, and the first hole to attach the band together with the buffer member to the band attachment portion, the second hole of the buffer member is formed across a side portion of the buffer member and a spacer provided on the inside of the side portion, the spacer of the buffer member is disposed inside one side of the first hole of the band attachment portion, and the fastening member is disposed inside the other side of the first hole of the band attachment portion with a gap between an inner peripheral surface of the first hole of the band attachment portion and an outer peripheral surface of the fastening member; A band attachment device.

2. A band attachment portion having a first hole formed therein; a buffer member disposed on each side of the band attachment portion and having a second hole formed therein; a band formed of a material harder than the buffer member, disposed on both sides of the outside of the buffer member, and having a third hole formed therein; a fastening member that passes through the third hole, the second hole, and the first hole to attach the band together with the buffer member to the band attachment portion, the fastening member is inserted into the first hole with a gap between an outer circumferential surface of the fastening member and an inner circumferential surface of the first hole of the band attachment portion, A buffer spacer made of soft synthetic resin is disposed in the gap. A band attachment device.

3. In the band attachment device according to claim 1, a fastening member having a large diameter shaft portion disposed in the third hole of the band and a small diameter shaft portion disposed in the second hole of the buffer member and in the first hole of the band attachment portion; A band attachment device comprising:

4. In the band attachment device according to any one of claims 1 to 3, The band attachment device, wherein the fastening member is inserted into the first hole of the band attachment portion without contacting the first hole.

5. 3. The band attachment device according to claim 2, The buffer spacer is integrally provided with the buffer member. A band attachment device.

6. 2. The band attachment device according to claim 1, The first hole of the band attachment portion is formed in a shape in which an inner diameter gradually increases from a middle portion of the first hole toward both ends of the first hole. A band attachment device.

7. In the band attachment device according to any one of claims 1 to 6, The band is made of a soft synthetic resin, and the cushioning member is made of the same or softer synthetic resin as the band. A band attachment device.

8. In the band attachment device according to any one of claims 1 to 7, The cushioning member is provided with a notch. A band attachment device.

9. 4. The band attachment device according to claim 3, The fastening member has a first threaded portion and a second threaded portion, The first threaded portion has a female threaded portion at an inner end of the small diameter shaft portion, The second threaded portion has a male threaded portion at an end of the small diameter shaft portion, the male threaded portion being screwed into the female threaded portion. A band attachment device.

10. A band attachment device according to any one of claims 1 to 9 is provided. A watch characterized by

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