JP7660498B2 - Pins for watch parts, watch bands and watches - Google Patents

Description

The present invention relates to pins for watch components, watch bands, and watches.

A wristwatch band is known in which the inner link and the outer link are connected by a pin. In such bands, the inner link and the outer link are connected by passing the pin through a through hole formed in the inner link and fitting both ends of the pin into an insertion hole formed in the outer link. Conventionally, to make it easier to insert the pin into the insertion hole of the outer link, the end of the pin is processed into a knurled shape with multiple grooves extending in the longitudinal direction.

Patent document 1 also describes providing a notch extending in the longitudinal direction at the end of the pin, instead of processing the end of the pin into a knurled shape.

Registered Utility Model No. 3058276

When using a pin with a groove or notch formed in the longitudinal direction as described above, a gap is created between the inner circumference of the insertion hole of the outer link and the outer circumference of the pin at the position of the groove or notch, reducing the contact area between the pin and the outer link. As a result, when an external force is applied to the pin, such as rotating the pin or pulling it out of the outer link, the pin may loosen or come off.

The present invention has been made to solve the above-mentioned problems, and aims to provide a pin for a watch component, a watch band, and a watch that can improve resistance to external forces.

The pin according to the present invention is a pin for connecting watch parts, and is characterized by having a columnar body and a fitting portion formed at the end of the body, and the fitting portion has a barb structure formed around its entire circumference that protrudes toward the center in the axial direction of the body.

In addition, in the pin according to the present invention, it is preferable that the length of the fitting portion in the axial direction is at least one time and at most two times the outer diameter of the body portion.

In addition, in the pin according to the present invention, it is preferable that the mating portion is formed with a barb structure having 3 to 5 barbs.

In addition, in the pin according to the present invention, the barb structure is formed by a tapered surface whose outer diameter decreases as it moves away from the body, and a connecting surface that connects the tapered surfaces, and the angle of the connecting surface with respect to the axial direction is preferably 85 degrees or more and 95 degrees or less.

In addition, in the pin according to the present invention, the barb structure is formed by a tapered surface whose outer diameter decreases as it moves away from the body, and a connecting surface that connects the tapered surfaces, and it is preferable that the gradient of the tapered surface relative to the axial direction is 5 degrees or more and 15 degrees or less.

In addition, in the pin according to the present invention, it is preferable that the body portion and the fitting portion have a circular cross-sectional shape.

The band according to the present invention is a band for a watch, and is characterized by having the pin according to the present invention, an inner link having a through hole through which the body of the pin is inserted, and an outer link having an insertion hole into which the fitting part of the pin is inserted and into which the pin fits, and in which the fitting part and a part of the body are inserted.

In addition, in the band according to the present invention, it is preferable that the depth of the insertion hole is equal to or less than the length of the fitting portion in the axial direction plus the outer diameter of the body portion.

The watch according to the present invention is characterized by having the band according to the present invention.

The pin for a watch component, the watch band, and the watch according to the present invention make it possible to improve resistance to external forces.

FIG. FIG. FIG. 4 is a cross-sectional view of the pin 4 in a state where it is fitted into the outer piece 32. FIG. 4 is a cross-sectional view of the pin 4 in a state where it is fitted into the outer piece 32. FIG. 2 is a cross-sectional view of the crown 21. FIG.

Various embodiments of the present invention will be described below with reference to the drawings. Please note that the technical scope of the present invention is not limited to these embodiments, but extends to the inventions described in the claims and their equivalents.

Figure 1 is a perspective view of a watch 1 according to an embodiment. The watch 1 has a watch body 2, a pair of bands 3, etc. The watch body 2 is a mechanical watch, a quartz analog watch, a digital watch, etc., with a time display function. A crown 21 for adjusting the time is arranged on the side of the watch body 2. The pair of bands 3 are connected to one end (the 12 o'clock side) and the other end (the 6 o'clock side) of the watch body 2, respectively, and are connected to each other by a clasp (not shown). The band 3 has a number of inner links 31 arranged along the extension direction of the band 3, and a number of outer links 32 arranged on both sides of the inner links 31 along the extension direction. The inner links 31 and the outer links 32 are made of a metal such as stainless steel or titanium. The crown 21, the inner links 31, and the outer links 32 are examples of watch parts.

Figure 2 is an exploded perspective view of the band 3. Between a pair of side surfaces of the inner link 31 facing the outer link 32, a circular first through hole 311a, a second through hole 311b, and a third through hole 311c (hereinafter, sometimes collectively referred to as through holes 311) are formed in this order. On the side surface of the outer link 32 facing the inner link 31, a circular first insertion hole 321a, a second insertion hole 321b, and a third insertion hole 321c (hereinafter, sometimes collectively referred to as insertion holes 321) are formed in this order.

The outer link 32 is arranged so that the first insertion hole 321a, the second insertion hole 321b, and the third insertion hole 321c face the third through hole 311c, the first through hole 311a, and the second through hole 311b of one of the inner links 31, respectively. This allows the inner link 31 and the outer link 32 to be arranged in a staggered manner in the extension direction of the band 3.

The inner link 31 and the outer link 32 are connected by a pin 4. The pin 4 is made of a metal such as stainless steel or titanium that has a hardness similar to or greater than that of the outer link 32, and has a cylindrical body 41 and fitting portions 42 formed at both ends of the body 41. The inner diameter of each through hole 311 of the inner link 31 is made larger than the outer diameter of the body of the pin 4. The body 41 of the pin 4 is inserted into each through hole 311 of the inner link 31 so that the fitting portions 42 of the pin 4 protrude from both ends.

Each insertion hole 321 of the outer link 32 is formed so that its inner diameter is smaller than the outer diameter of the body 41 of the pin 4 and the maximum outer diameter of the fitting portion 42. The fitting portions 42 of the pin 4 protruding from both ends of the inner link 31 are press-fitted into each insertion hole 321 of the outer link 32, and the pin 4 fits into the insertion hole 321. This joins the inner link 31 and the outer link 32.

Because there is a gap between the inner peripheral surface of the through hole 311 of the inner link 31 and the outer peripheral surface of the body 41 of the pin 4, the inner link 31 can rotate relative to the pin 4. Therefore, the inner link 31 can rotate relative to the outer link 32 with the pin 4 inserted through the third through hole 311c as the rotation axis. This allows the band 3 to bend.

Figure 3 is a plan view of the pin 4, and Figures 4 and 5 are cross-sectional views of the pin 4 when fitted into the outer block 32. Figure 4 is a cross-sectional view taken along the line IV-IV in Figure 3, and Figure 5 is a cross-sectional view taken along the line V-V in Figure 3. In Figure 5, the inner peripheral surface of the insertion hole 321 is shown by a dotted line.

The fitting portion 42 has a shape in which multiple truncated cones are stacked so as to be coaxial with the axis R of the body portion 41. That is, the fitting portion 42 is formed with a barb structure 421 that protrudes toward the body portion 41. Also, as shown in FIG. 5, the inner diameter of the insertion hole 321 is larger than the minimum value of the outer diameter of the fitting portion 42 (i.e., the diameter of the upper base surface of the truncated cone) and smaller than the maximum value (i.e., the diameter of the lower base surface of the truncated cone). As a result, when the fitting portion 42 is pressed into the insertion hole 321, the barb structure 421 bites into the inner peripheral surface of the insertion hole 321, and the fitting portion 42 and the insertion hole 321 fit together.

The fitting portion 42 is symmetrical about the axis R, and the barb structure 421 is formed around the entire outer periphery of the fitting portion 42. This gives the pin 4 high resistance to external forces that rotate it around its axis, and high corrosion resistance.

That is, as shown in FIG. 5, the barb structure 421 is formed around the entire circumference of the fitting portion 42, so that the barb structure 421 is evenly embedded around the entire circumference of the inner surface of the insertion hole 321. Since the barb structure 421 protruding toward the body portion 41 is held by the inner surface of the insertion hole 321 around the entire circumference, the pin 4 has a particularly high resistance to an external force in a direction to pull the pin 4 out of the insertion hole 321. In addition, since a strong frictional force is generated between the fitting portion 42 and the insertion hole 321, the pin 4 also has a high resistance to an external force in a direction to rotate the pin 4 around the axis. In addition, since the barb structure 421 contacts the inner surface of the insertion hole 321 around the entire circumference, the inside of the insertion hole 321 is sealed, reducing the risk of corrosion due to the intrusion of liquids, etc.

In the example shown in Figures 3 and 4, three barb structures 421 are formed in the fitting portion 42. It is preferable that multiple barb structures 421 are formed in the fitting portion 42, and more preferably, three to five barb structures 421 are formed. By forming three or more barb structures 421 in the fitting portion 42, the multiple barb structures 421 bite into the inner circumferential surface and are each held in the insertion hole 321, so that the pin 4 has higher resistance to external forces. In addition, by having five or fewer barb structures 421, the thickness of each barb structure 421 in the axial direction is prevented from becoming thin, and the barb structures 421 are less likely to deform, so that the pin 4 has higher resistance to external forces.

The barb structure 421 is formed by a tapered surface 422 having a gradient such that the outer diameter decreases as it moves away from the body 41, and a connecting surface 423 that connects the multiple tapered surfaces 422. The fitting portion 42 has a tapered surface 422, so that the pin 4 has high resistance to external forces. That is, when the fitting portion 42 is pressed into the insertion hole 321, the tapered surface 422 comes into contact with the inner surface of the insertion hole 321 and functions as a guide that aligns the axis of the fitting portion 42 with the center of the insertion hole 321. By aligning the axis of the fitting portion 42 with the center of the insertion hole 321, the fitting portion 42 is easily fitted evenly around the entire circumference of the inner surface of the insertion hole 321, so that the pin 4 has high resistance to external forces in all directions.

The tapered surface 422 corresponds to the side surface of a truncated cone, and is therefore axially symmetrical with respect to the axis R. This gives the pin 4 a higher resistance to external forces. That is, if the fitting portion of the pin has a shape that is not axially symmetrical, such as a knurled shape, when the fitting portion is pressed into the insertion hole 321, the contact area between the fitting portion and the inner circumferential surface of the insertion hole 321 becomes smaller. In this case, a strong force is locally applied to the contact portion between the fitting portion and the insertion hole 321, and the insertion hole 321 may be significantly deformed. If such deformation occurs in the insertion hole 321, the fitting portion will no longer be able to be evenly fitted with the inner circumferential surface of the insertion hole 321 over the entire circumference, and the resistance of the pin to external forces will decrease. In the pin 4 according to the embodiment, since the tapered surface 422 is axially symmetrical, the contact area between the fitting portion 42 and the inner circumferential surface of the insertion hole 321 when the fitting portion 42 is pressed into the insertion hole 321 becomes larger, and the deformation of the insertion hole 321 is minimized. This allows the pin 4 to fit evenly around the entire circumference of the inner surface of the insertion hole 321, providing greater resistance to external forces.

The gradient G1 of the tapered surface 422 with respect to the axial direction (the extension direction of the axis R) is preferably 5 degrees or more and 15 degrees or less, and more preferably 10 degrees. As a result, the pin 4 is properly inserted into the insertion hole 321 and has higher resistance to external forces. That is, when the gradient G1 is 5 degrees or more, the frictional force between the fitting portion 42 and the inner surface of the insertion hole 321 during press-fitting is reduced, so that the fitting portion 42 is properly inserted to the back of the insertion hole 321. Also, when the gradient G1 is 15 degrees or less, the tapered surface 422 and the inner surface of the insertion hole 321 come into contact with each other at an early stage after the fitting portion 42 enters the inside of the insertion hole 321 during press-fitting, so that the tapered surface 422 can easily function as a guide. As a result, the fitting portion 42 is properly inserted into the insertion hole 321 with its axis coinciding with the axis of the insertion hole 321.

The angle G2 of the connection surface 423 forming the barb structure 421 with respect to the axial direction is preferably 85 degrees or more and 95 degrees or less, and more preferably 90 degrees. This makes the pin 4 more resistant to external forces. That is, when the barb structure 421 bites into the inner circumferential surface of the insertion hole 321, the barb structure 421 receives a resistance force in a direction from the inner circumferential surface toward the axial center. Since the angle G2 between the connection surface 423 forming the barb structure 421 and the axial direction is 85 degrees or more and 95 degrees or less, and the connection surface 423 is approximately perpendicular to the axial direction, the barb structure 421 is less likely to deform even when subjected to such resistance. Therefore, the barb structure 421 is appropriately bitten into the inner circumferential surface of the insertion hole 321, and the pin 4 has a higher resistance to an external force in a direction to pull it out of the insertion hole 321.

The length L1 of the fitting portion 42 in the axial direction (the extension direction of the axis R) is 1 to 2 times the outer diameter D of the body portion 41. This gives the pin 4 high resistance to external forces and improves the product yield. If the length L1 of the fitting portion 42 is small, the range in which the barb structure 421 bites into the inner surface of the insertion hole 321 becomes narrow, which may reduce the pin 4's resistance to external forces. On the other hand, if the length L1 of the fitting portion 42 is large, the pin 4 may be easily broken, which may reduce the product yield. By making the length L1 1 to 2 times the outer diameter D, such adverse effects are prevented, the pin 4 has high resistance to external forces, and the product yield is improved.

As shown in FIG. 4, the depth L2 of the insertion hole 321 of the outer block 32 is greater than the length L1 of the fitting portion 42 in the axial direction. Therefore, when the fitting portion 42 is pressed into the insertion hole 321, the fitting portion 42 and a part of the body portion 41 are inserted into the insertion hole 321. The outer diameter D of the body portion 41 is equal to the maximum outer diameter of the fitting portion 42. This improves the resistance of the band 3 to external forces of the pin 4. That is, since the body portion 41 is cylindrical with an outer diameter larger than the inner diameter of the insertion hole 321, the entire outer circumferential surface of the body portion 41 contacts the inner circumferential surface of the insertion hole 321 when pressed into the insertion hole 321, and moves at high speed along the contact surface. Therefore, strong frictional pressure welding is generated between the outer circumferential surface of the body portion 41 and the inner circumferential surface of the insertion hole 321, and the body portion 41 and the insertion hole 321 are fixed to each other. This improves the resistance of the pin 4 to external forces.

Preferably, the depth L2 of the insertion hole 321 is equal to or less than the length L1 of the fitting portion 42 plus the outer diameter D of the body portion 41. In other words, the axial length of the body portion 41 inserted into the insertion hole 321 is shorter than the outer diameter D of the body portion 41. This allows the band 3 to improve the product yield. If the body portion 41 inserted into the insertion hole 321 is too long, the body portion 41 will be subjected to a strong frictional force, and the fitting portion 42 will not be inserted all the way into the insertion hole 321, which may cause variation in product dimensions or breakage of the pin 4. By setting the depth L2 of the insertion hole 321 to equal to or less than the length L1 plus the outer diameter D, variation in product dimensions and breakage of the product are prevented, and the product yield is improved.

Figure 6 is a cross-sectional view of the crown 21 of the watch body 2. Figure 6 shows only the vicinity of the crown 21 among the cross-sectional views taken along the line VI-VI in Figure 1.

The crown 21 has a columnar shaft 211 formed on the side of the watch body 2 and inserted into an insertion hole 22 that penetrates the inside and outside of the watch body 2, and an operating part 212 formed at the end of the shaft 211 for the user to rotate. A recess 213 is formed on the end face of the shaft 211 opposite the operating part 212 for engaging with a winding stem that connects to a movement (not shown) built into the watch body 2. As a result, the winding stem connected to the movement rotates in response to the user's rotation of the operating part 212, adjusting the time.

The crown 21 is connected to the watch body 2 by a pin 5. The pin 5 is made of a metal such as stainless steel or titanium that has a hardness similar to or greater than the hardness of the surroundings of the insertion hole 22 in the watch body 2. The pin 5 has a columnar body 51 and a fitting portion 52 formed at one end of the body 51.

The insertion hole 22 in the watch body 2 is formed with an inner diameter smaller than the maximum of the outer diameter of the body 51 of the pin 5 and the outer diameter of the fitting portion 52. The fitting portion 52 of the pin 5 is press-fitted into the insertion hole 22 in the watch body 2, and the fitting portion 52 fits into the insertion hole 22. This joins the watch body 2 and the pin 5.

The pin 5 is also formed with a through hole 53 along the axial direction (the extension direction of the axis S of the body 51), and an engagement portion 54 that partially protrudes from the outer periphery of the body 51. The shaft portion 211 of the crown 21 is inserted into the through hole 53, and the operating portion 212 engages with the engagement portion 54. The operating portion 212 engages with the engagement portion 54, restricting the movement of the operating portion 212 in the axial direction. This connects the crown 21 to the watch body 2.

The shape of the fitting portion 52 is the same as that of the fitting portion 42 of the pin 4. That is, the fitting portion 52 has a shape in which multiple truncated cones are stacked so as to be coaxial with the axis S of the body portion 51, and the fitting portion 52 has a barb structure 521 formed around its entire circumference that protrudes toward the body portion 51. The fitting portion 52 is symmetrical about the axis S, and the barb structure 521 is formed around the entire outer periphery of the fitting portion 52. This gives the pin 5 high resistance to external forces and high corrosion resistance.

The mating portion 52 preferably has multiple barb structures 521, and more preferably has three to five barb structures 521. This makes the pin 5 more resistant to external forces.

The barb structure 521 is formed by a tapered surface 522 having a gradient such that the outer diameter decreases with increasing distance from the body 51, and a connecting surface 523 that connects the multiple tapered surfaces 522. The fitting portion 52 has a tapered surface 522 that functions as a guide to align the axis of the fitting portion 52 with the center of the insertion hole 22, which makes it easier for the fitting portion 52 to fit evenly around the entire inner surface of the insertion hole 321, and therefore the pin 4 has high resistance to external forces.

The tapered surface 522 is symmetrical about the axis S. This minimizes deformation of the insertion hole 22, and the pin 5 has higher resistance to external forces.

The gradient H1 of the tapered surface 522 relative to the axial direction is preferably 5 degrees or more and 15 degrees or less, and more preferably 10 degrees. This allows the pin 5 to be properly inserted into the insertion hole 22, and the pin 5 has higher resistance to external forces.

The angle H2 of the connection surface 523 with respect to the axial direction is preferably 85 degrees or more and 95 degrees or less, and more preferably 90 degrees. This prevents the barb structure 521 from being deformed by the force from the insertion hole 22 and keeps it properly embedded in the inner surface of the insertion hole 22, so that the pin 5 has higher resistance to external forces.

The body 51 is connected to the fitting portion 52 and has a cylindrical first portion 511 having an outer diameter E equal to the maximum outer diameter of the fitting portion 52, and a cylindrical second portion 512 having an outer diameter larger than that of the first portion 511. The length M1 in the axial direction of the fitting portion 52 is at least one time and at most two times the outer diameter E of the first portion 511. This gives the pin 4 high resistance to external forces and prevents the pin 5 from becoming easily broken, improving the product yield.

Since the outer diameter of the second portion 512 is larger than the outer diameter E of the first portion 511, when the fitting portion 52 is pressed into the insertion hole 22, the fitting portion 52 and the first portion 511 of the body portion 51 are inserted into the insertion hole 22. Furthermore, the outer diameter E of the first portion 511 is equal to the maximum outer diameter of the fitting portion 52. As a result, strong frictional pressure welding is generated between the outer peripheral surface of the first portion 511 and the inner peripheral surface of the insertion hole 22, and the first portion 511 and the insertion hole 22 are fixed together, so that the pin 5 has high resistance to external forces.

Preferably, the length M2 in the axial direction of the first portion 511 is smaller than the outer diameter E of the first portion 511. In other words, the length in the axial direction of the body portion 51 inserted into the insertion hole 22 is smaller than the outer diameter E of the first portion 511, which is the minimum value of the outer diameter of the body portion 51. This allows the pin 5 to be properly inserted into the insertion hole 22, prevents the pin 5 from breaking, and improves the product yield.

As described above, the pin (4, 5) according to the embodiment has a columnar body (41, 51) and a fitting portion (42, 52) formed at the end of the body (41, 51). The fitting portion (42, 52) has a barb structure (421, 521) that protrudes toward the body (41, 51) around the entire circumference. This gives the pin (4, 5) high resistance to external forces.

In addition, preferably, the length (L1, M1) of the fitting portion (42, 52) in the axial direction is greater than or equal to one time and less than or equal to two times the outer diameter (D, E) of the body portion (41, 51). This makes the pin (4, 5) more resistant to external forces and improves the product yield.

In addition, preferably, the mating portion (42, 52) is formed with three to five barb structures (421, 521). This makes the pin 4 more resistant to external forces.

The barb structure (421, 521) is formed by a plurality of tapered surfaces (422, 522) whose outer diameter decreases with increasing distance from the body (41, 51), and a connecting surface (423, 523) that connects the plurality of tapered surfaces (422, 522). Preferably, the angle (G2, H2) of the connecting surface (423, 523) with respect to the axial direction is 85 degrees or more and 95 degrees or less. This provides the pin (4, 5) with higher resistance to external forces.

Moreover, preferably, the gradient (G1, H1) of the tapered surface (422, 522) with respect to the axial direction is 5 degrees or more and 15 degrees or less. This makes the pin (4, 5) more resistant to external forces.

The watch band 3 according to the embodiment has a pin 4, an inner link 31 with a through hole 311 through which the body 41 of the pin 4 is inserted, and an outer link 32 with an insertion hole 321 into which the fitting portion 42 of the pin 4 is inserted and into which the pin 4 fits. The fitting portion 42 and a part of the body 41 are inserted into the insertion hole 321. This improves the resistance of the band 3 to external forces caused by the pin 4.

In addition, preferably, the depth L2 of the insertion hole 321 is equal to or less than the length L1 of the fitting portion 42 in the axial direction plus the outer diameter D of the body portion 41. This allows the band 3 to improve the product yield.

The following modifications may be applied to the watch 1 according to the embodiment.

In the above description, the body 41 and the fitting portion 42 of the pin 4 have a circular cross-sectional shape, but this is not limited to this example. The body 41 and the fitting portion 42 may have an elliptical or polygonal cross-sectional shape. For example, the body 41 may be a square prism. In this case, the fitting portion 42 has a shape like a quadrangular pyramid stacked on top of each other. When the body 41 and the fitting portion 42 have a circular cross-sectional shape, the fitting portion 42 is held in the insertion hole 321 evenly over the entire circumference, so it has the highest resistance to external forces. However, even when the body 41 and the fitting portion 42 have a cross-sectional shape other than a circle, the fitting portion 42 is held in the insertion hole 321 over the entire circumference, so it can have a certain degree of high resistance to external forces. Similarly, the body 51 and the fitting portion 52 of the pin 5 may have an elliptical or polygonal cross-sectional shape.

In the above description, the fitting portion 42 of the pin 4 is fitted into the insertion hole 321 by press-fitting, but this is not limited to the example. The fitting portion 42 may be press-fitted into the insertion hole 321 with adhesive applied in advance, and be fitted into and fixed to the insertion hole 321. This further improves resistance to external forces. Also, since the inside of the insertion hole 321 is filled with adhesive, liquids and the like are prevented from entering, and corrosion resistance is improved. Similarly, the fitting portion 52 of the pin 5 may be press-fitted into the insertion hole 22 with adhesive applied in advance, and be fitted into and fixed to the insertion hole 22.

In the above-described embodiment, pin 4 connects inner link 31 and outer link 32, and pin 5 connects crown 21 and watch body 2, but this is not limited to the above example, and pin 4 or 5 may be used to connect other watch parts. For example, if watch body 2 is equipped with a push button or the like, pin 5 may be used to connect the push button to watch body 2.

It should be understood by those skilled in the art that various changes, substitutions, and modifications can be made to the present invention without departing from the scope of the present invention. For example, the above-described embodiments and modifications may be implemented in appropriate combinations within the scope of the present invention.

Reference Signs List 1 watch 3 band 31 inner link 32 outer link 4 pin 41 body 42 fitting portion 421 barb structure 422 tapered surface 423 connection surface

Claims (9)

A watch band, comprising:
A pin for connecting timepiece parts , the pin having a columnar body and a fitting portion formed at an end of the body , the fitting portion having a barb structure protruding toward the body over the entire circumference , the barb structure being formed by a tapered surface whose outer diameter decreases as it moves away from the body, and a connecting surface connecting the tapered surfaces;
an inner piece having a through hole through which the body of the pin is inserted;
an outer piece having an insertion hole into which the fitting portion of the pin is inserted and into which the pin is fitted;
The fitting portion and a part of the body portion are inserted into the insertion hole,
The part of the body and the inner circumferential surface of the insertion hole are fixed to each other.
A band that features The band according to claim 1 , wherein the length of the fitting portion in the axial direction is equal to or greater than one time and equal to or less than two times the outer diameter of the body portion. The fitting portion is formed with 3 to 5 of the barb structures.
3. A band as claimed in claim 1 or 2. The body portion and the fitting portion have a circular cross-sectional shape.
A band according to any one of claims 1 to 3. The depth of the insertion hole is equal to or less than the sum of the axial length of the fitting portion and the outer diameter of the body portion.
A band according to any one of claims 1 to 4 . The diameter of the inner peripheral surface of the insertion hole is smaller than the outer diameter of the body portion.
A band according to any one of claims 1 to 5. The gradient of the tapered surface with respect to the axial direction is 5 degrees or more and 15 degrees or less.
A band according to any one of claims 1 to 6. The angle of the connecting surface with respect to the axial direction is 85 degrees or more and 95 degrees or less.
A band according to any one of claims 1 to 7. A watch comprising a band according to any one of claims 1 to 8 .

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