Connecting member, band, and timepiece

Abstract

To provide a connecting member capable of preventing corrosion by enhancing corrosion resistance, a band equipped with the same, and a timepiece equipped with the band.SOLUTION: This device is provided with a cylindrical member 15, a connecting pin 16 being a connecting part inserted into at least one end part of the cylindrical member 15, and a spring member 17 arranged in the cylindrical member 15 and energizing the connecting pin 16 toward the outside of the cylindrical member 15, and the spring member 17 is formed of a corrosion resistant material. Therefore, corrosion resistance of the spring member 17 can be enhanced and, as a result, corrosion of the spring member 17 can be favorably prevented.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present invention relates to a connecting member used in wristwatches, clothing, bags, purses, etc., a band equipped with the same, and a timepiece equipped with the band. [Background technology]

[0002] For example, in the case of a wristwatch, as described in Patent Document 1, a wristwatch is known in which the band is attached to band attachment portions provided on the 12 o'clock and 6 o'clock sides of the watch case using connecting members called spring bars. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 2019-60844

[0004] The connecting members used in such wristwatches are configured so that connecting pins are inserted into both ends of the pipe section and a coiled spring member is placed inside the pipe section, and the spring force of this spring member urges the connecting pin toward the outside of the pipe section. The spring member of such connecting members is made of a non-magnetic cobalt-nickel alloy so as not to affect the magnetic sensor built into the wristwatch. Summary of the Invention [Problem to be solved by the invention]

[0005] However, the spring components of the connecting parts used in such watches are made of a non-magnetic material, a cobalt-nickel alloy, which poses a problem in that the spring components are susceptible to corrosion by seawater when the watch is used underwater.

[0006] The problem to be solved by this invention is to provide a connecting member that has improved corrosion resistance and can prevent corrosion, a band equipped with the same, and a timepiece equipped with the band. [Means for solving the problem]

[0007] The present invention provides a connecting member comprising a tubular member, a connecting portion inserted into at least one end of the tubular member, and a spring member disposed within the tubular member and biasing the connecting portion toward the outside of the tubular member, wherein the spring member is formed from a corrosion-resistant material. [Effects of the Invention]

[0008] According to this invention, the corrosion resistance of the spring member can be improved, and thus the corrosion of the spring member can be effectively prevented. [Brief explanation of the drawings]

[0009] [Figure 1] 1 is a perspective view showing a first embodiment of a wristwatch to which the present invention is applied. [Figure 2] FIG. 2 is an enlarged front view showing the first band body on the 12 o'clock side of the wristwatch shown in FIG. [Figure 3] 3 is an enlarged cross-sectional view of the connecting member attached to the first band body shown in FIG. 2, taken along the line AA. [Figure 4] FIG. 10 is an enlarged cross-sectional view of a connecting member attached to a first band body in a second embodiment of a wristwatch to which the present invention is applied. [Figure 5] FIG. 10 is a perspective view showing a modified example of a wristwatch to which the present invention is applied. DETAILED DESCRIPTION OF THE INVENTION

[0010] (First embodiment) A first embodiment of a wristwatch to which the present invention is applied will now be described with reference to FIGS. As shown in Figure 1, this wristwatch has a wristwatch case 1. Switch units 2 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] As shown in Figure 1, band attachment sections 4 to which band 3 is attached are provided at the 12 o'clock and 6 o'clock positions of this wristwatch case 1. In this case, band 3 comprises a first band main body 5 attached to band attachment section 4 on the 12 o'clock side, and a second band main body 6 attached to band attachment section 4 on the 6 o'clock side. Each of these first band main body 5 and second band main body 6 is made of synthetic leather or synthetic resin such as urethane resin.

[0012] 1, an attachment protrusion 4a is provided in the middle of the 12 o'clock side band attachment part 4 in the short direction perpendicular to the longitudinal direction of the first band main body 5. The length of this 12 o'clock side attachment protrusion 4a that protrudes from the watch case 1 is longer than the length of each attachment side part 4b located on both sides of the first band main body 5 in the short direction.

[0013] 1, an attachment protrusion 4a is provided in the middle of the band attachment part 4 on the 6 o'clock side in the short direction perpendicular to the longitudinal direction of the second band main body 6. The length of this attachment protrusion 4a on the 6 o'clock side that protrudes from the watch case 1 is longer than the length of each attachment side part 4b located on both sides of the second band main body 6 in the short direction.

[0014] 1 and 2, one end 5a of the first band main body 5 on the 12 o'clock side, that is, the end 5a of the first band main body 5 that is attached to the 12 o'clock side band attachment portion 4, is provided with an attachment recess 7 into which the attachment protrusion 4a of the 12 o'clock side band attachment portion 4 is inserted. As a result, the 12 o'clock side first band main body 5 is attached to the band attachment portion 4 with screw members 9 in a state where the attachment protrusion 4a of the band attachment portion 4 is inserted and positioned in the attachment recess 7 of the one end 5a. In other words, the 12 o'clock side first band main body 5 has band side portions 7a located on both sides of the attachment recess 7 attached to the attachment protrusions 4a of the 12 o'clock side band attachment portion 4 with the screw members 9.

[0015] Similarly, one end 6a of the second band main body 6 on the 6 o'clock side, that is, the end 6a of the second band main body 6 that is attached to the 6 o'clock side band attachment part 4, is provided with an attachment recess 8 into which the attachment protrusion 4a of the 6 o'clock side band attachment part 4 is inserted and positioned, as shown in Fig. 1. As a result, the second band main body 6 on the 6 o'clock side is attached to the band attachment part 4 with screw members 9, with the attachment protrusion 4a of the band attachment part 4 inserted and positioned in the attachment recess 8 of the one end 6a. In other words, the second band main body 6 on the 6 o'clock side has each band side portion 8a located on both sides of the attachment recess 8 attached to the attachment protrusion 4a of the 6 o'clock side band attachment part 4 with the screw members 9.

[0016] In this case, although not shown, the screw member 9 has a first screw portion having a male screw portion and a second screw portion having a female screw portion that screws into the male screw portion. As a result, the screw member 9 on the 12 o'clock side is configured so that the first screw portion is inserted into the mounting protrusion 4a of the 12 o'clock side band mounting portion 4 from one of the band side portions 7a on both sides of the mounting recess 7 of the first band main body 5 on the 12 o'clock side, and the second screw portion is inserted into the mounting protrusion 4a of the 12 o'clock side band mounting portion 4 from the other of the band side portions 7a on both sides of the mounting recess 7 of the first band main body 5 on the 12 o'clock side.

[0017] 1, this 12 o'clock side screw member 9 is configured so that the male thread portion of the first thread portion and the female thread portion of the second thread portion are inserted into the attachment protrusion 4a of the 12 o'clock side band attachment portion 4, and the male thread portion of the first thread portion is screwed into the female thread portion of the second thread portion. In this way, the 12 o'clock side screw member 9 attaches the band side portions 7a located on both sides of the attachment recess 7 of the 12 o'clock side first band main body 5 to the attachment protrusion 4a of the 12 o'clock side band attachment portion 4 of the watch case 1.

[0018] Similarly, as shown in FIG. 1, the screw member 9 on the 6 o'clock side is configured so that the first screw portion is inserted into the mounting protrusion 4a of the band mounting part 4 on the 6 o'clock side from one of the band side portions 8a on both sides of the mounting recess 8 of the second band main body 6 on the 6 o'clock side, and the second screw portion is inserted into the mounting protrusion 4a of the band mounting part 4 on the 6 o'clock side from the other of the band side portions 8a on both sides of the mounting recess 8 of the second band main body 6 on the 6 o'clock side.

[0019] 1, this 6 o'clock side screw member 9 is configured so that the male thread portion of the first thread portion screws into the female thread portion of the second thread portion when the male thread portion of the first thread portion and the female thread portion of the second thread portion are inserted into the attachment protrusion 4a of the 6 o'clock side band attachment portion 4. In this way, the 6 o'clock side screw member 9 attaches the band side portions 8a located on both sides of the attachment recess 8 of the 6 o'clock side second band main body 6 to the attachment protrusion 4a of the 6 o'clock side band attachment portion 4 of the watch case 1.

[0020] 1 and 2, a buckle 10 and a keeper ring 11 are attached to the other end 5b of the first band body 5 on the 12 o'clock side, that is, the other end 5b located opposite the one end 5a of the first band body 5 on the 12 o'clock side where the mounting recess 7 is provided. The buckle 10 is a metal fitting that connects the other end 5b of the first band body 5 on the 12 o'clock side with the other end 6b of the second band body 6 on the 6 o'clock side.

[0021] That is, as shown in Figure 2, this buckle 10 comprises a buckle body 13 attached to the other end 5b of the first band body 5 on the 12 o'clock side by a connecting member 12 called a spring rod, and a locking pin 14 attached to the connecting member 12. The buckle body 13 is a metal fitting into which the other end 6b of the second band body 6 on the 6 o'clock side is inserted so that it overlaps with the other end 5b of the first band body 5 on the 12 o'clock side. This buckle body 13 is formed by bending both sides of a rod-shaped member in the same direction into a U-shape, and comprises a lock body portion 13a and lock side portions 13b on both sides of the lock body portion 13a.

[0022] 2 and 3, this buckle body 13 is configured so that each lock side portion 13b on both sides is attached to both ends in the short direction of the other end portion 5b of the first band body 5 on the 12 o'clock side by the connecting member 12. In other words, this buckle body 13 is configured so that each lock side portion 13b on both sides is disposed at the other end portion 5b of the first band body 5. In this case, each lock side portion 13b on both sides of the buckle body 13 is provided with a lock mounting hole 13c into which the pin portion 16b and connecting protrusion portion 18 of a connecting pin 16 (described later) of the connecting member 12 are inserted.

[0023] As a result, as shown in Figures 2 and 3, the buckle body 13 is configured so that, with each lock side portion 13b on both sides positioned at the other end 5b of the first band body 5 on the 12 o'clock side, the pin portion 16b and connecting protrusion portion 18 of the connecting pin 16 of the connecting member 12 attached to the other end 5b of the first band body 5 are inserted into each lock mounting hole 13c provided on each lock side portion 13b on both sides of the buckle body 13, and attached to the other end 5b of the first band body 5.

[0024] As shown in Fig. 2, the locking pin 14 consists of two pin lock portions 14a connected in a roughly H-shape by connecting pieces 14b. These two pin lock portions 14a are configured to be inserted into any two of the band holes 6c in the short direction of the second band main body 6 out of the multiple band holes 6c provided in two rows in the second band main body 6 on the 6 o'clock side of the watch case 1, as shown in Figs.

[0025] 2 and 3, the locking pin 14 is configured so that, with each tip 14c, which is one end of each of the two pin locking portions 14a, and each lock mounting ring 14d provided at the other end of the two pin locking portions 14a opposite to each other, attached to a tubular member 15 (described later) of the connecting member 12, each tip 14c of the two pin locking portions 14a abuts against and is locked to the lock main body 13a of the buckle main body 13. In this case, the lock mounting ring 14d at the other end of the pin locking portion 14a is formed in a ring shape into which the tubular member 15 of the connecting member 12 is inserted, as shown in FIG.

[0026] As a result, as shown in Figures 1 and 2, when the other end 6b of the second band body 6 on the 6 o'clock side of the watch case 1 is inserted into the frame-shaped buckle body 13, and in this state the two pin lock portions 14a of the locking pin 14 are inserted into any two of the band holes 6c in the short direction of the second band body 6 out of the multiple band holes 6c provided in the second band body 6 on the 6 o'clock side, the buckle 10 is configured to overlap and connect the other end 5b side of the first band body 5 on the 12 o'clock side of the watch case 1 and the other end 6b side of the second band body 6 on the 6 o'clock side.

[0027] 2, the free ring 11 prevents play such as wobbling of the other end 6b of the second band main body 6 on the 6 o'clock side of the watch case 1, and is attached to the first band main body 5 on the 12 o'clock side so that it can move along its longitudinal direction. This free ring 11 is configured so that the other end 6b of the second band main body 6 on the 6 o'clock side can be inserted into it when the other end 6b of the second band main body 6 on the 6 o'clock side of the watch case 1 is attached by the buckle 10 so that it overlaps with the other end 5b of the first band main body 5 on the 12 o'clock side.

[0028] 3, the connecting member 12 includes a cylindrical member 15 attached to the other end 5b of the first band main body 5 on the 12 o'clock side along the short direction of the first band main body 5, a connecting pin 16 which is a connecting part inserted into one end of the cylindrical member 15, and a spring member 17 which is disposed inside the cylindrical member 15 and biases the connecting pin 16 toward the outside of the cylindrical member 15. The cylindrical member 15 is attached by being inserted into a cylindrical mounting hole 5c which is provided on the other end 5b of the first band main body 5 along the short direction of the first band main body 5.

[0029] As shown in Fig. 3, the cylindrical member 15 includes a round-bar-shaped cylindrical main body 15a. An accommodating hole 15b for accommodating the connecting pin 16 and the spring member 17 is provided along the axial direction at one end of the cylindrical main body 15a. That is, the accommodating hole 15b is provided from one end of the cylindrical main body 15a to the middle in the axial direction. As a result, the accommodating hole 15b is formed with a length approximately half the axial length of the cylindrical main body 15a. Furthermore, a pin-shaped connecting protrusion 18 is integrally provided at the other end of the cylindrical main body 15a.

[0030] 3, connecting pin 16 includes a slide portion 16a that is slidably inserted into accommodation hole 15b of tube main body 15a of tubular member 15, and a pin portion 16b that is provided at one end of slide portion 16a and protrudes so as to be able to appear and disappear outside tube main body 15a. Slide portion 16a is formed so that its outer diameter is approximately the same as the inner diameter of accommodation hole 15b, and its axial length is slightly shorter than the length of the inner diameter of accommodation hole 15b.

[0031] 3, pin portion 16b has an outer diameter that is approximately half the outer diameter of cylindrical member 15, an axial length that is longer than the axial length of slide portion 16a, and is formed to have a length that is approximately the same as the outer diameter of cylindrical member 15. In this case, a ring-shaped retaining portion 15c is provided by crimping at one end of cylindrical main body portion 15a, i.e., at the end of cylindrical main body portion 15a that is located on the open side of accommodation hole 15b, facing the inside of accommodation hole 15b.

[0032] As a result, as shown in Figure 3, when the pin portion 16b is pushed out toward the outside of the tube main body portion 15a through the ring-shaped anti-pullout portion 15c by the spring force of the spring member 17, the outer surface of the slide portion 16a abuts against the inner surface of the anti-pullout portion 15c, preventing the slide portion 16a from slipping out of the accommodating hole 15b of the tube main body portion 15a.

[0033] 3, the pin-shaped connecting protrusion 18 of the tube main body 15a is formed so that its outer diameter is the same as the outer diameter of the pin portion 16b of the connecting pin 16. The axial length of the pin-shaped connecting protrusion 18 is formed so that it is the same as the axial length of the pin portion 16b of the connecting pin 16 that protrudes from the tube main body 15a.

[0034] In this case, as shown in Figure 3, a mark 19 for identifying the pin-shaped connecting protrusion 18 is provided on the outer peripheral surface of the other end of the tube main body 15a. This mark 19 is a V-shaped groove that is provided in a ring shape along the outer periphery of the tube main body 15a. Furthermore, this mark 19 is hidden so as not to be seen from the outside when the buckle main body 13 is attached to the other end 5b of the first band main body 5 by the tubular member 15 with the tube main body 15a inserted into the tube attachment hole 5c provided in the other end 5b of the first band main body 5.

[0035] 3, spring member 17 is a coil spring, and its outer diameter is formed to be approximately the same as the inner diameter of accommodation hole 15b provided in tube main body portion 15a of tubular member 15. Furthermore, this spring member 17 is formed so that its axial length in a free state is the same as or longer than the axial length of accommodation hole 15b. As a result, spring member 17 is disposed in accommodation hole 15b in a compressed state, and in this state, the spring force of spring member 17 urges slide portion 16a of connecting pin 16 toward the outside of tube main body portion 15a, pushing pin portion 16b out of tube main body portion 15a.

[0036] In this case, the spring member 17 is formed from a corrosion-resistant material. That is, the spring member 17 is formed from a titanium alloy having spring properties, that is, a β-titanium alloy having a body-centered cubic crystalline structure called the β-phase. This β-titanium alloy is the strongest of all titanium alloys, has excellent corrosion resistance, and is also easy to process. In this case, a titanium oxide coating is formed on the surface of the material, and the strength of this titanium oxide coating provides excellent corrosion resistance.

[0037] The cylindrical member 15, which has the connecting protrusion 18 on the cylindrical main body 15a, and the connecting pin 16 are made of a high-strength titanium alloy. Specifically, the cylindrical member 15 and the connecting pin 16 are made of an α-β titanium alloy (JIS type 60) containing aluminum (Al) and vanadium (V) in a ratio of approximately 6:4. This α-β titanium alloy is a 64 titanium alloy, a two-phase system that possesses the properties of both α and β titanium alloys, and is particularly well-balanced in terms of ductility and strength. In this case, the α-titanium alloy is a titanium alloy with a hexagonal close-packed crystalline structure known as the α phase.

[0038] Next, let's look at the mechanical and physical properties of titanium. First, in order from greatest to least, the tensile strength (MPa) is as follows: α-β titanium alloy (64 titanium alloy, JIS Class 60) ≧ 895, β titanium alloy ≧ 800, and pure titanium (JIS Class 2) ≧ 340. Next, the yield strength (MPa) is as follows: α-β titanium alloy (64 titanium alloy, JIS Class 60) ≧ 828, β titanium alloy ≧ 690, and pure titanium (JIS Class 2) ≧ 210. Next, the hardness (Hv) is as follows: α-β titanium alloy (64 titanium alloy, JIS Class 60) ≧ 320, β titanium alloy ≧ 270, and pure titanium (JIS Class 2) ≧ 130.

[0039] Thus, the tensile strength (MPa), yield strength (MPa), and hardness (Hv) of the α-β titanium alloy (64 titanium alloy), β titanium alloy, and pure titanium are listed in descending order. Therefore, when the 64 titanium alloy is used for the connecting pin 16 and the tubular member 15, and the β titanium alloy is used for the spring member 17, the tensile strength (MPa), yield strength (MPa), and hardness (Hv) of the connecting pin 16 and the tubular member 15 are the same, but the hardness (Hv) of the spring member 17 is smaller.

[0040] Next, in descending order of thermal conductivity [W / (m·K)], pure titanium (JIS Class 2) is 17.0, beta titanium alloy is 8.1, and alpha-beta titanium alloy (64 titanium alloy, JIS Class 60) is 7.5. Next, in descending order of elongation (%), pure titanium (JIS Class 2) ≥ 23, beta titanium alloy ≥ 12, and alpha-beta titanium alloy (64 titanium alloy, JIS Class 60) ≥ 10.

[0041] Thus, the thermal conductivity [W / (m K)] and elongation (%) of the materials, in descending order, are pure titanium, β titanium alloy, and α-β titanium alloy (64 titanium alloy). Therefore, when a β titanium alloy is used as spring material 17 and a 64 titanium alloy is used as connecting pin 16 and tubular member 15, the thermal conductivity [W / (m K)] and elongation (%) of spring material 17 are greater, while those of connecting pin 16 and tubular member 15 are the same.

[0042] Next, a description will be given of how to attach the band 3 to such a wristwatch case 1. In this case, first, the idle ring 11 is inserted into the other end 5b of the first band main body 5 on the 12 o'clock side, and the buckle 10 is attached to the other end 5b of the first band main body 5 with the connecting member 12. At this time, the connecting member 12 is assembled in advance. When assembling this connecting member 12, first, the coil-shaped spring member 17 is placed in the receiving hole 15b provided on one end side of the tube main body portion 15a.

[0043] Then, while compressing the spring member 17, the sliding portion 16a of the connecting pin 16 is inserted into the accommodation hole 15b of the tube main body portion 15a. In this state, one end of the tube main body portion 15a located on the open side of the accommodation hole 15b is crimped to provide a ring-shaped retaining portion 15c at one end of the tube main body portion 15a. As a result, the spring force of the spring member 17 presses the sliding portion 16a of the connecting pin 16 against the retaining portion 15c, and the pin portion 16b of the connecting pin 16 is pushed out from one end of the tube main body portion 15a. In this state, the connecting member 12 is assembled.

[0044] The buckle 10 is attached to the other end 5b of the first band body 5 on the 12 o'clock side using the connecting member 12 assembled in this manner. At this time, the connecting member 12 is attached to the tube mounting hole 5c provided in the other end 5b of the first band body 5 on the 12 o'clock side along the short direction of the first band body 5, and the locking pin 14 of the buckle 10 is attached to this connecting member 12. In this case, as shown in Figure 3, the ring-shaped lock mounting loop portions 14d provided on the two pin lock portions 14a of the locking pin 14 are positioned in advance in the notches 5d provided across the tube mounting hole 5c in the other end 5b of the first band body 5 on the 12 o'clock side.

[0045] In this state, the tube main body portion 15a of the connecting member 12 is inserted into the tube mounting hole 5c provided in the other end portion 5b of the first band main body 5 on the 12 o'clock side. At this time, the tube main body portion 15a is inserted into each lock mounting ring portion 14d of the two pin lock portions 14a of the locking pin 14 located in the cutout portion 5d of the other end portion 5b of the first band main body 5 on the 12 o'clock side. As a result, the tubular member 15 is inserted into the tube mounting hole 5c provided in the other end portion 5b of the first band main body 5 on the 12 o'clock side, and the locking pin 14 is rotatably attached to the tube main body portion 15a of the tubular member 15.

[0046] At this time, the pin portion 16b of the connecting pin 16 protruding from one end of the tube main body portion 15a of the cylindrical member 15 is positioned so as to protrude from one side of the tube mounting hole 5c provided in the other end portion 5b of the first band main body 5 on the 12 o'clock side. At the same time, the pin-shaped connecting protrusion portion 18 provided in the other end portion of the tube main body portion 15a of the cylindrical member 15 is positioned so as to protrude from the other side of the tube mounting hole 5c provided in the other end portion 5b of the first band main body 5 on the 12 o'clock side.

[0047] In this state, the buckle body 13 of the buckle 10 is attached to the other end 5b of the first band body 5 on the 12 o'clock side. To do this, first, as shown in Figure 3, the connecting protrusion 18 on the other end of the tube body 15a protruding from the other tube mounting hole 5c on the other end 5b of the first band body 5 on the 12 o'clock side is inserted into the lock mounting hole 13c provided on one of the lock side portions 13b on both sides of the buckle body 13.

[0048] In this state, the pin portion 16b of the connecting pin 16 of the connecting member 12 protruding from one side of the tube mounting hole 5c of the other end portion 5b of the first band body 5 on the 12 o'clock side is pushed into the receiving hole 15b of the tube body portion 15a against the spring force of the spring member 17. Then, of the lock side portions 13b on both sides of the buckle body 13, the pin portion 16b of the connecting pin 16 of the connecting member 12 pushed into the receiving hole 15b of the tube body portion 15a is aligned with the lock mounting hole 13c provided in the other lock side portion 13b.

[0049] Then, the pin portion 16b of the connecting pin 16 of the connecting member 12 is pushed outward from the accommodation hole 15b of the cylindrical main body 15a by the spring force of the spring member 17. As a result, the pushed-out pin portion 16b of the connecting pin 16 is inserted into the lock mounting hole 13c provided in the other of the lock side portions 13b on both sides of the buckle main body 13, as shown in Figure 3.

[0050] 3, the pin-shaped connecting protrusion 18 of the connecting member 12 is inserted into the lock mounting hole 13c of one lock side portion 13b of the buckle body 13, and the pin portion 16b of the connecting pin 16 of the connecting member 12 is inserted into the lock mounting hole 13c of the other lock side portion 13b of the buckle body 13. As a result, the buckle body 13 is attached to the other end portion 5b of the first band body 5 on the 12 o'clock side by the connecting member 12.

[0051] Then, the 12 o'clock side first band main body 5, to which the buckle 10 and keeper ring 11 are attached, is attached to the 12 o'clock side band attachment portion 4 of the watch case 1. At this time, the attachment recess 7 provided on one end 5a of the 12 o'clock side first band main body 5 is aligned with the attachment protrusion 4a of the 12 o'clock side band attachment portion 4, and the attachment protrusion 4a of the 12 o'clock side band attachment portion 4 is positioned in the attachment recess 7 of the first band main body 5. In this state, the first band main body 5 is attached to the 12 o'clock side band attachment portion 4 with the screw member 9.

[0052] At this time, the first screw portion of the screw member 9 on the 12 o'clock side is inserted into the mounting protrusion 4a of the band mounting portion 4 on the 12 o'clock side from one of the band side portions 7a on both sides of the mounting recess 7 of the first band main body 5, and the second screw portion is inserted into the mounting protrusion 4a of the band mounting portion 4 on the 12 o'clock side from the other of the band side portions 7a on both sides of the mounting recess 7 of the first band main body 5 on the 12 o'clock side.

[0053] Then, with the male threaded portion of the first threaded portion and the female threaded portion of the second threaded portion of the 12 o'clock side screw member 9 inserted into the mounting protrusion 4a of the 12 o'clock side band mounting portion 4, the male threaded portion of the first threaded portion is screwed into the female threaded portion of the second threaded portion. As a result, the band side portions 7a located on both sides of the mounting recess 7 of the 12 o'clock side first band main body 5 are attached to the mounting protrusion 4a of the 12 o'clock side band mounting portion 4 of the watch case 1 by the 12 o'clock side screw member 9.

[0054] Similarly, the 6 o'clock side second band main body 6 is attached to the 6 o'clock side band attachment part 4 of the watch case 1. At this time, two rows of band holes 6c into which the tip ends 14c of the two pin locking parts 14a of the locking pins 14 of the buckle 10 are inserted are formed in advance in the 6 o'clock side second band main body 6 along the longitudinal direction of the second band main body 6. Then, the attachment recess 8 formed in one end part 6a of the 6 o'clock side second band main body 6 is aligned with the attachment protrusion 4a of the 6 o'clock side band attachment part 4.

[0055] In this state, the attachment protrusion 4a of the 6 o'clock side band attachment portion 4 is placed in the attachment recess 8 of the 6 o'clock side second band main body 6. Then, the 6 o'clock side second band main body 6 is attached to the 6 o'clock side band attachment portion 4 with the screw member 9. At this time, the first threaded portion of the 6 o'clock side screw member 9 is inserted from one of the band side portions 8a on both sides of the attachment recess 8 of the 6 o'clock side second band main body 6 into the attachment protrusion 4a of the 6 o'clock side band attachment portion 4, and the second threaded portion is inserted from the other of the band side portions 8a on both sides of the attachment recess 8 of the 6 o'clock side second band main body 6 into the attachment protrusion 4a of the 6 o'clock side band attachment portion 4.

[0056] Then, with the male threaded portion of the first threaded portion and the female threaded portion of the second threaded portion of the 6 o'clock side screw member 9 inserted into the mounting protrusion 4a of the 6 o'clock side band mounting portion 4, the male threaded portion of the first threaded portion is screwed into the female threaded portion of the second threaded portion. As a result, the band side portions 8a located on both sides of the mounting recess 8 of the 6 o'clock side second band main body 6 are attached to the mounting protrusion 4a of the 6 o'clock side band mounting portion 4 of the watch case 1 by the 6 o'clock side screw member 9.

[0057] Next, how to use such a wristwatch will be described. In this case, first, the watch case 1 is attached to the wrist by the band 3. At this time, with the watch case 1 placed on the wrist, the other end 6b of the second band body 6 on the 6 o'clock side is inserted into the frame of the buckle body 13 of the buckle 10 attached to the other end 5b of the first band body 5 on the 12 o'clock side, and the other end 6b of the second band body 6 on the 6 o'clock side is overlapped with the other end 5b of the first band body 5 on the 12 o'clock side.

[0058] In this state, the other end 6b of the second band main body 6 on the 6 o'clock side is pulled toward the 12 o'clock side of the watch case 1, and the watch case 1 is fitted tightly to the wrist. Then, the tip ends 14c of the two pin lock portions 14a of the locking pin 14 of the buckle 10 provided at the other end 5b of the first band main body 5 on the 12 o'clock side are inserted into any two of the band holes 6c in the short direction of the second band main body 6 out of the multiple band holes 6c provided in the second band main body 6 on the 6 o'clock side inserted into the frame-like shape of the buckle main body 13.

[0059] Then, with the other end 6b of the second band body 6 on the 6 o'clock side overlapping the other end 5b of the first band body 5 on the 12 o'clock side, the tips 14c of the two pin lock portions 14a of the locking pin 14 of the buckle 10 are pressed against the lock body portion 13a of the buckle body 13. This connects the other end 6b of the second band body 6 on the 6 o'clock side to the other end 5b of the first band body 5 on the 12 o'clock side. In this state, the other end 6b of the second band body 6 on the 6 o'clock side is inserted into the circumferential loop 11 provided on the first band body 5 on the 12 o'clock side to prevent play such as wobbling of the other end 6b of the second band body 6 on the 6 o'clock side. This allows the watch case 1 to be attached to the wrist by the band 3.

[0060] This type of wristwatch can be used effectively even when worn on the wrist and diving underwater. In other words, because the spring member 17 of the connecting member 12 that attaches the buckle 10 to the other end 5b of the first band main body 5 on the 12 o'clock side of this wristwatch is made of a corrosion-resistant material, the corrosion resistance of the spring member 17 is high and it can be effectively prevented from corroding due to seawater, etc.

[0061] In this case, the spring member 17 is formed from a titanium alloy with spring properties, i.e., a β-titanium alloy with a body-centered cubic crystalline structure called the β-phase, which gives it the highest strength among titanium alloys, enhanced corrosion resistance, and excellent workability. In this case, a titanium oxide coating is formed on the surface of the titanium material, and the strength of this titanium oxide coating gives it excellent corrosion resistance.

[0062] Furthermore, in this connecting member 12, the tubular member 15 having the connecting protrusions 18 provided on the tubular main body 15a and the connecting pin 16 are made of a high-strength titanium alloy, so that the strength and corrosion resistance are enhanced. That is, the tubular member 15 and the connecting pin 16 are made of an α-β titanium alloy (64 titanium alloy) containing aluminum (AI) and vanadium (V) in a ratio of approximately 6:4, so that the strength and corrosion resistance are further enhanced.

[0063] Thus, the connecting member 12 of this wristwatch comprises a tubular member 15, a connecting pin 16 which is a connecting part that is inserted into at least one end of the tubular member 15, and a spring member 17 which is arranged inside the tubular member 15 and urges the connecting pin 16 towards the outside of the tubular member 15; and because the spring member 17 is made of a corrosion-resistant material, the corrosion resistance of the spring member 17 can be increased, thereby reliably and effectively preventing corrosion of the spring member 17.

[0064] That is, in connecting member 12 of this wristwatch, spring member 17 is formed from a titanium alloy that has spring properties, which reliably imparts spring properties to spring member 17, and because spring member 17 is formed from a titanium alloy, it is possible to reliably increase the corrosion resistance of spring member 17 and reliably prevent corrosion of spring member 17. In this case, titanium has a titanium oxide coating formed on the surface of the material, and because this titanium oxide coating is strong, it is able to exhibit excellent corrosion resistance.

[0065] Furthermore, in the connecting member 12 of this wristwatch, the spring member 17 is formed from a titanium alloy with a body-centered cubic crystalline structure, which further enhances the corrosion resistance of the spring member 17 and also provides excellent workability, allowing the spring member 17 to be manufactured easily and satisfactorily.

[0066] Furthermore, in the connecting member 12 of this wristwatch, a connecting pin 16 is inserted into one end of the tubular member 15, and a connecting protrusion 18 is provided at the other end of the tubular member 15. As a result, all that is required is to provide a receiving hole 15b at one end of the tubular member 15 and insert the connecting pin 16 and spring member 17 into this receiving hole 15b. This results in a simple structure, a small number of parts, and easy manufacturing, and also simplifies the assembly process as all that needs to be done is to operate the connecting pin 16 at one end.

[0067] In this case, connecting member 12 of this wristwatch is provided with a mark 19 on the other end side of tubular member 15 to identify connecting protrusion 18, so that even if pin portion 16b of connecting pin 16 on the movable side and connecting protrusion 18 on the fixed side have the same shape, it is easy to tell which is the fixed side by mark 19, improving attachment workability. Also, this mark 19 can be hidden so that it cannot be seen from the outside when tubular member 15 is inserted into tube attachment hole 5c provided on the other end 5b of first band main body 5, resulting in a more appealing design.

[0068] Furthermore, in the connecting member 12 of this wristwatch, the tubular member 15 having the connecting protrusion 18 on the tube main body 15a and the connecting pin 16 are formed from a high-strength titanium alloy, which not only improves corrosion resistance but also increases the strength between the tubular member 15 and the connecting pin 16, ensuring the strength between the tubular member 15 and the connecting pin 16.

[0069] In this case, in the connecting member 12 of this wristwatch, the tubular member 15 having the connecting protrusion 18 provided on the main tube portion 15a and the connecting pin 16 are formed from an alpha-beta titanium alloy (64 titanium alloy) containing aluminum and vanadium in a ratio of approximately 6:4, so that it has the properties of both alpha and beta titanium alloys, and in particular can combine ductility and strength in a balanced manner, thereby further increasing strength and corrosion resistance.

[0070] (Second embodiment) Next, a second embodiment of a wristwatch to which the present invention is applied will be explained with reference to Fig. 4. Note that the same parts as those in the first embodiment shown in Figs. 1 to 3 will be given the same reference numerals. This wristwatch has a different structure from the connecting member 12 of the first embodiment in that the connecting member 20 attached to the other end 5b of the first band main body 5 on the 12 o'clock side is different from the connecting member 12 of the first embodiment, but otherwise has almost the same structure as the first embodiment.

[0071] That is, as shown in FIG. 4, the connecting member 20 comprises a tubular member 21 formed in a pipe shape, connecting pins 16 which are connecting parts inserted into both end portions of the tubular member 21, and spring members 22 which are arranged inside the tubular member 21 and urge the connecting pins 16 at both end portions outward from both sides of the tubular member 21.

[0072] 4, the tubular member includes a cylindrically formed tube main body portion 21a, and both ends of this tube main body portion 21a are provided with stopper portions 21b, similar to the first embodiment. As a result, even if the spring force of the spring member 22 arranged inside the tube main body portion 21a urges the connecting pins 16 inserted into both ends of the tube main body portion 21a in a direction to push them outward, the stopper portions 21b provided at both ends of the tube main body portion 21a prevent the connecting pins 16 from coming out of the both ends of the tube main body portion 21a.

[0073] 4, the spring member 22 is formed so that its outer diameter is approximately the same as the inner diameter of the tube main body 21a. Furthermore, the spring member 22 is formed so that, in a free state, its axial length is the same as or longer than the axial length of the tube main body 21a. As a result, the spring member 22 is arranged in a compressed state when placed inside the tube main body 21a, and the spring force of the spring member 22 urges the connecting pins 16 on both sides in a direction that pushes them outward.

[0074] Meanwhile, the spring member 22 of the connecting member 20 is formed of a corrosion-resistant material, as in the first embodiment. That is, the spring member 22 is formed of a titanium alloy having spring properties, that is, a β-titanium alloy having a body-centered cubic crystalline structure called the β-phase. As a result, the spring member 22 has the highest strength among titanium alloys, has enhanced corrosion resistance, and is also excellent in processability. In this case, too, a titanium oxide coating is formed on the surface of the material, and the strength of this titanium oxide coating provides excellent corrosion resistance.

[0075] Furthermore, as in the first embodiment, the connecting pin 16 is made of a high-strength titanium alloy, which provides high strength and enhanced corrosion resistance. That is, the connecting pin 16 is made of an α-β titanium alloy (64 titanium alloy) containing aluminum (AI) and vanadium (V) in a ratio of approximately 6:4, which provides the properties of both α-titanium alloys and β-titanium alloys, with a particularly well-balanced combination of ductility and strength, further enhancing strength and corrosion resistance.

[0076] On the other hand, the cylindrical member 21 is made of high-purity titanium, i.e., pure titanium (JIS Class 2). This pure titanium is a single α-phase, and the crystalline structure called the α-phase is a close-packed hexagonal structure. The cylindrical member 21 made of such pure titanium is inexpensive, has high strength, and has improved corrosion resistance.

[0077] Therefore, when 64 titanium alloy is used for the connecting pin 16, β titanium alloy is used for the spring member 22, and pure titanium is used for the tubular member 21, the tensile strength (MPa), proof stress (MPa), and hardness (Hv) are greatest in the connecting pin 16, spring member 22, and tubular member 21, respectively. Also, the thermal conductivity [W / (m·K)] and elongation (%) are greatest in the tubular member 21, spring member 22, and connecting pin 16, respectively.

[0078] Next, a description will be given of how to attach the band 3 to such a wristwatch case 1. In this case, as in the first embodiment, the idle ring 11 is inserted into the other end 5b of the first band main body 5 on the 12 o'clock side, and the buckle 10 is attached to the other end 5b of the first band main body 5 with the connecting member 20. At this time, the connecting member 20 is assembled in advance. When assembling this connecting member 20, first, the coil-shaped spring member 22 is placed inside the tube main body portion 21a of the tubular member 21.

[0079] Then, while compressing the spring member 22, the slide portions 16a of the two connecting pins 16 are inserted into both end portions of the tube main body portion 21a. In this state, the open end portions of the tube main body portion 21a are crimped to provide ring-shaped retaining portions 21b at both end portions of the tube main body portion 21a. As a result, the slide portions 16a of the two connecting pins 16 are pressed against the retaining portions 21b at both end portions of the tube main body portion 21a by the spring force of the spring member 22, and the pin portions 16b of each connecting pin 16 are pushed out from both end portions of the tube main body portion 21a. In this state, the connecting member 20 is assembled.

[0080] The buckle 10 is attached to the other end 5b of the first band body 5 on the 12 o'clock side using the connecting member 20 assembled in this manner. At this time, as in the first embodiment, the connecting member 20 is attached to the tube mounting hole 5c provided in the other end 5b of the first band body 5 on the 12 o'clock side along the short direction of the first band body 5, and the locking pin 14 of the buckle 10 is attached to this connecting member 20. In this case as well, the ring-shaped lock mounting loop portions 14d provided on the two pin lock portions 14a of the locking pin 14 are each positioned in a notch portion 5d provided in advance across the tube mounting hole 5c in the other end 5b of the first band body 5 on the 12 o'clock side.

[0081] In this state, as in the first embodiment, the tube main body portion 21a of the connecting member 20 is inserted into the tube mounting hole 5c provided in the other end portion 5b of the first band main body 5 on the 12 o'clock side. At this time, the tube main body portion 21a is inserted into each of the lock mounting ring portions 14d of the two pin lock portions 14a of the locking pin 14. As a result, the tubular member 21 is inserted into the tube mounting hole 5c provided in the other end portion 5b of the first band main body 5 on the 12 o'clock side, and the locking pin 14 is rotatably attached to the tube main body portion 21a of the tubular member 21.

[0082] At this time, the pin portions 16b of each connecting pin 16 protruding from both ends of the tube main body portion 21a are positioned so as to protrude from both sides of the tube mounting hole 5c provided in the other end portion 5b of the first band main body 5 on the 12 o'clock side. In this state, the buckle main body 13 of the buckle 10 is attached to the other end portion 5b of the first band main body 5 on the 12 o'clock side. At this time, the pin portions 16b of each connecting pin 16 of the connecting member 20 protruding from both sides of the tube mounting hole 5c in the other end portion 5b of the first band main body 5 on the 12 o'clock side are pushed into the tube main body portion 21a against the spring force of the spring member 22.

[0083] In this state, the pin portions 16b of the connecting pins 16 of the connecting member 20 pushed into the cylindrical main body 21a are aligned with the lock mounting holes 13c provided in the lock side portions 13b on both sides of the buckle body 13. Then, the pin portions 16b of the connecting pins 16 of the connecting member 20 are pushed outward from the cylindrical main body 21a by the spring force of the spring member 22. As a result, the pin portions 16b of the pushed-out connecting pins 16 are inserted into the lock mounting holes 13c provided in the lock side portions 13b on both sides of the buckle body 13.

[0084] Therefore, the buckle body 13 is attached to the other end 5b of the first band body 5 on the 12 o'clock side by the connecting pins 16 of the connecting member 20. Then, the 12 o'clock side first band body 5 with the buckle 10 and keeper ring 11 attached is attached to the band attachment portion 4 on the 12 o'clock side of the watch case 1, just like in the first embodiment. Similarly, the 6 o'clock side band body 6 is attached to the band attachment portion 4 on the 6 o'clock side of the watch case 1, just like in the first embodiment. A watch with the band 3 attached to the watch case 1 in this way can be used just like in the first embodiment.

[0085] Thus, the connecting member 20 of this wristwatch comprises a tubular member 21, connecting pins 16 which are connecting parts inserted into both ends of the tubular member 21, and a spring member 22 which is arranged inside the tubular member 21 and urges each connecting pin 16 at both ends towards the outside of the tubular member 21; and because the spring member 22 is made of a corrosion-resistant material, as in the first embodiment, the corrosion resistance of the spring member 22 can be increased and corrosion of the spring member 22 can be effectively prevented.

[0086] That is to say, in the connecting member 20 of this wristwatch, the spring member 22 is formed from a titanium alloy which has spring properties, so similar to the first embodiment, it is possible to reliably impart spring properties to the spring member 22, and because the spring member 22 is formed from a titanium alloy, it is possible to reliably increase the corrosion resistance of the spring member 22 and reliably prevent corrosion of the spring member 22. In this case too, titanium has a titanium oxide coating formed on the surface of the material, and because this titanium oxide coating is strong, it is able to exhibit excellent corrosion resistance.

[0087] Furthermore, in connecting member 20 of this wristwatch, spring member 22 is formed from a titanium alloy with a body-centered cubic crystalline structure, which, like in the first embodiment, further enhances the corrosion resistance of spring member 22 and provides excellent workability, making it easy to manufacture spring member 22. In this case, spring member 22 is formed with an axial length that is the same as or longer than the axial length of tubular member 21, making it easier to design and manufacture than when the axial length is shorter.

[0088] Furthermore, in the connecting member 20 of this wristwatch, connecting pins 16 are inserted into both ends of the tubular member 21, which allows the components of each connecting pin 16 inserted into both ends of the tubular member 21 to be standardized, thereby simplifying the structure and the assembly work.

[0089] Furthermore, in the connecting member 20 of this wristwatch, the tubular member 21 is formed from high-purity titanium, i.e., pure titanium, which allows for high strength and enhanced corrosion resistance. That is, the tubular member 21 is made of high-purity titanium, i.e., a single α-phase, and is formed from pure titanium with a hexagonal close-packed crystal structure known as the α-phase, which makes the tubular member 21 inexpensive, strong, and highly corrosion-resistant.

[0090] Furthermore, in the connecting member 20 of this wristwatch, the connecting pin 16 is formed from a high-strength titanium alloy, which not only improves corrosion resistance as in the first embodiment, but also increases the strength of the connecting pin 16, thereby ensuring the strength of the connecting pin 16.

[0091] In this case, too, in the connecting member 20 of this wristwatch, the connecting pin 16 is formed from an alpha-beta titanium alloy (64 titanium alloy) containing aluminum and vanadium in a ratio of approximately 6:4, so as in the first embodiment, it has the properties of both alpha titanium alloy and beta titanium alloy, and in particular, it is possible to combine ductility and strength in a balanced manner, which allows for even greater strength and corrosion resistance.

[0092] In the first and second embodiments described above, the buckle 10 is attached to the other end 5b of the first band main body 5 on the 12 o'clock side by the connecting members 12, 20, but the present invention is not limited to this, and the connecting member 12 of the first embodiment or the connecting member 20 of the second embodiment may be used in place of the 12 o'clock side screw member 9 that attaches the 12 o'clock side first band main body 5 to the 12 o'clock side band attachment portion 4 of the watch case 1, or the 6 o'clock side screw member 9 that attaches the 6 o'clock side second band main body 6 to the 6 o'clock side band attachment portion 4 of the watch case 1.

[0093] Furthermore, in the first and second embodiments described above, the first band body 5 and the second band body 6 are described as being formed from synthetic leather or synthetic resin such as urethane resin, but the present invention is not limited to this, and the band 24 may also be one in which the first band body 25 and the second band body 26 are formed from metal, as in the modified example shown in FIG. 5.

[0094] 5, the first band body 25 and the second band body 26 have a structure in which a plurality of metal band links 27 are sequentially connected by the connecting member 12 of the first embodiment or the connecting member 20 of the second embodiment. In this modification, too, the connecting fitting 28 that connects the end of the first band body 25 and the end of the second band body 26 may be attached to the first band body 25 and the second band body 26 by the connecting member 12 of the first embodiment or the connecting member 20 of the second embodiment.

[0095] Also, in this modified example, the connecting member 12 of the first embodiment or the connecting member 20 of the second embodiment may be used in place of the 12 o'clock side screw member 9 that attaches the first band body 25 on the 12 o'clock side to the band attachment portion 4 on the 12 o'clock side of the watch case 1, or the 6 o'clock side screw member 9 that attaches the second band body 26 on the 6 o'clock side to the band attachment portion 4 on the 6 o'clock side of the watch case 1.

[0096] Furthermore, in the first and second embodiments described above, the locking pin 14 of the buckle 10 has two pin lock portions 14a, and the second band body 6 has two rows of band holes 6c into which the two pin lock portions 14a are inserted, arranged along the longitudinal direction. However, the present invention is not limited to this, and may have a structure in which, for example, the locking pin of the buckle 10 has one pin lock portion, and the second band body 6 has one row of band holes 6c into which the one pin lock portion is inserted, arranged along the longitudinal direction.

[0097] Furthermore, in the above-described first and second embodiments, the outer shape of the tubular member 15 in the first embodiment or the outer shape of the tubular member 21 in the second embodiment is described as being circular, but in this invention, the outer shape does not necessarily have to be circular, and may be formed into a polygonal shape such as a square, pentagon, or hexagon.

[0098] Furthermore, in the first and second embodiments described above, the spring members 17, 22 are described as being formed from a β-titanium alloy, but the present invention is not limited to this, and any material with excellent corrosion resistance may be used, such as gold, platinum, or chromium.

[0099] Furthermore, while the first and second embodiments and their variations described above are applied to wristwatches, the present invention does not necessarily have to be applied to wristwatches, but can also be applied to bands used on clothing, bags, purses, etc. [Explanation of symbols]

[0100] 1 watch case 2 Switch section 3, 24 band 4 Band attachment part 4a Mounting protrusion 4b Mounting side 5, 25 First band body 5a, 6a One end 5b, 6b other end 5c Cylinder mounting hole 5d Notch 6, 26 Second band body 6c Band hole 7, 8 Mounting recess 7a, 8a Band side 9 Screw members 10 Buckle 11. Free Ring 12, 20 Connecting member 13 Buckle body 13a Lock body 13b Lock side 13c Lock mounting hole 14 Locking pin 14a Pin lock 14b Connecting piece 14c Tip 14d Lock mounting ring 15, 21 Cylindrical member 15a, 21a Cylinder body 15b Storage hole 15c, 21b retaining part 16 connecting pin 16a Slide section 16b Pin section 17, 22 Spring members 18 Connecting protrusion 19 Landmark 27 Band piece 28 Connecting fittings

Claims

1. A cylindrical member and A connecting portion inserted into at least one end of the cylindrical member, A spring member disposed within the cylindrical member and biasing the connecting portion toward the outside of the cylindrical member, Equipped with, The cylindrical member and the connecting portion are made of titanium. The spring member is characterized in that it has spring properties, is made of a different type of titanium material than the titanium material forming the cylindrical member and the connecting portion, and has a titanium oxide coating formed on its surface.

2. In the connecting member according to claim 1, A connecting member characterized in that at least one of the tensile strength, yield strength, and hardness is the same for the connecting portion and the cylindrical member, and the spring member is smaller than or larger than the connecting portion and the cylindrical member, in the order of the connecting portion, the spring member, and the cylindrical member.

3. In the connecting member according to claim 1, At least one of the thermal conductivity and elongation is the same for the connecting portion and the cylindrical member, and the spring member is larger than the connecting portion and the cylindrical member, or the order from largest to smallest is the cylindrical member, the spring member, and the connecting portion. A connecting member characterized by the following features.

4. In the connecting member according to claim 1, The spring member is a connecting member characterized by being formed of a titanium alloy having a body-centered cubic crystal structure.

5. In the connecting member according to claim 1, The connecting portion is inserted into one end of the cylindrical member. A connecting projection is provided at the other end of the cylindrical member. A connecting member characterized by the following features.

6. In the connecting member according to claim 5, A mark for identifying the connecting projection is provided on the other end of the cylindrical member. A connecting member characterized by the following features.

7. In the connecting member according to claim 6, The connecting member is characterized in that the marker is positioned so as not to be visible from the outside when the cylindrical member is inserted into the member covering the cylindrical member.

8. In the connecting member according to Claim 1, The spring member is formed with an axial length that is the same as, or longer than, the axial length of the cylindrical member. A connecting member characterized by the following features.

9. In the connecting member according to claim 1, The connecting portion is inserted into both ends of the cylindrical member. A connecting member characterized by the following features.

10. A band characterized by comprising the connecting member described in claim 1.

11. In the band described in Claim 10, The connecting portion is inserted into one end of the cylindrical member. The other end of the cylindrical member is provided with a connecting projection and a mark to identify the connecting projection. The band is characterized in that the marker is positioned so as not to be visible from the outside when the cylindrical member is inserted into the main body of the band.

12. A watch characterized by comprising a band as described in claim 10 or 11.

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