JPH0523043Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Field of Application) The present invention relates to a wristwatch band that sequentially connects pieces in a hinge-like manner.

(Prior Art) An example of a conventional watch band is shown in FIGS. 4 and 5. FIG. 4 is a longitudinal cross-sectional view showing a structure in which the pieces of a conventional watch band are connected in a hinge-like manner, and FIG. 5 is an exploded perspective view of a conventionally used mounting pin and retaining ring.

4 and 5, a mounting portion 2 is formed at the center of one side edge of a piece 1, and a convex portion 4 is formed at the center of one side edge of the adjacent piece 3. The convex portion 2 and the concave portion 4 are engaged with each other, and by providing the concave portion 4, a shaft hole is bored through the shoulder portions 5, 5 formed on the piece 3 and the convex portion 2. The diameter 6a of the shaft hole 6 bored in this convex portion 2 is
The diameter is larger than the diameter 7a of the shaft holes 7, 7 bored in the shaft holes 7, 7. Further, a retaining ring 8 having a C-ring-shaped cross section and a cut 8a is loosely fitted into the shaft hole 6 of the convex portion 2. This retaining ring 8 has elasticity, and its outer diameter 8b is smaller than the diameter 6a of the shaft hole 6 of the convex portion 2.
The inner diameter 8c is larger than the diameter 7a of the shoulder part 5,
The diameter 7a of the shaft holes 7, 7 bored in the shaft hole 5 is smaller than that of the shaft hole 7, and the shaft hole 7 is relatively thick. A mounting pin 9 made of a solid round metal bar having tapered portions 9a, 9a at its tips is inserted into the retaining ring 8 through the shaft holes 7, 7 of the shoulder portions 5, 5.

With this configuration, the mounting pin 9 is gripped and fixed by the elasticity of the retaining ring 8, and the retaining ring 8 is loosely fitted into the shaft hole 6 of the convex portion 2, with its axial movement being restricted by the shoulders 5, 5. Then, both ends of the mounting pin 9 are loosely fitted into the shaft holes 7, 7 of the shoulder parts 5, 5, and the adjacent pieces 1, 3 are successively connected in a hinge shape around the mounting pin 9, thereby forming a wrist watch band. has been done.

(Problem to be solved by the invention) By the way, in the conventional structure described above, the mounting pin 9 is held and fixed by the elasticity of the retaining ring 8. The force for fixing the mounting pin 9 tends to vary greatly due to variations in hardening and other factors. the result,
There is a problem in that when the watch band is used and the pieces 1 and 3 are repeatedly bent or twisted, the mounting pin 9 may gradually come out or fall off.

Further, if the internal stress distribution of the retaining ring 8 due to hardening or the like is inappropriate, the retaining ring 8 will open naturally and the mounting pin 9 will fall off.

The purpose of the present invention was to solve the above-mentioned problems of conventional wristwatch bands, and to provide a wristwatch band in which a mounting pin is securely fixed by a retaining ring. It is in.

(Means for Solving the Problems) In order to achieve the above object, the wristwatch band of the present invention has a convex portion formed in the middle of the side edge of a piece and a concave portion formed on the side edge of an adjacent piece. , a shaft hole is bored through the shoulder formed by providing the concave portion and the convex portion, and the shaft hole of the convex portion is made larger in diameter than the shaft hole of the shoulder; A retaining ring having an outer diameter larger than the diameter of the shaft hole and an inner diameter smaller than that of the shaft hole is loosely fitted into the shaft hole of the convex portion, and a mounting pin is inserted into the retaining ring through the shaft hole of the shoulder portion and fixed to form the hinge. In a wrist watch band in which pieces are sequentially connected in a shape, a plurality of axially thin band-shaped protrusions are formed in the axial middle of a metal pipe to form the retaining ring, and the ring is made of a metal pipe having a harder hardness than that of the metal pipe. The mounting pin is made of a metal round bar with a low resistance and relatively easy to plastically deform, and the mounting pin is configured to be plastically deformed and fixed when it is press-fitted into the retaining ring.

(Function) A retaining ring made of a highly hard metal pipe with multiple thin strip-like protrusions that protrude inward in the axial middle, and a metal round bar that is less hard and relatively easily deformed plastically. Since the mounting pin is press-fitted, plastic deformation is easily caused by the thin band-shaped protrusion of the retaining ring during press-fitting, and an axial groove is formed in the mounting pin as a striation. Then, due to the relative rotation around the axis of the retaining ring and the mounting pin after press-fitting, the groove in the part corresponding to the protrusion is plastically deformed and enlarged, and as the groove expands in the circumferential direction, Due to the deformation, a bank is raised at the border between the groove in the part corresponding to the protrusion and the groove in the part not corresponding, and this bank prevents it from coming off.

(Description of Embodiments) Hereinafter, embodiments of the present invention will be described with reference to FIGS. 1 to 3. FIG. 1 is an exploded perspective view of a mounting pin and a retaining ring used in the wristwatch band of the present invention, and FIG. 2 is a cross-sectional view taken along the line A-A in FIG. 1 of an embodiment of the retaining ring. FIG. 3 is a longitudinal sectional view illustrating how the mounting pin is press-fitted into the retaining ring to prevent it from coming off. Note that, except for the retaining ring and the mounting pin, the other structures are the same as the conventional structure shown in FIG. 4, and redundant explanation will be omitted.

In FIG. 1, the retaining ring 10 is made of a metal pipe with relatively high hardness, such as stainless steel, and has a plurality of thin band-shaped protrusions that protrude inside the axial center with an appropriate length in the axial direction. Upper part 10a,
10a... are formed. The outer diameter 10b and inner diameter 10c of this retaining ring 10 are
is set similarly to the conventional structure. That is,
The outer diameter 10b is smaller than the diameter 6a of the shaft hole 6 of the convex part 2 and larger than the diameter 7a of the shaft hole 7, 7 of the shoulder parts 5, 5, and the inner diameter 10c is the diameter of the shaft hole 7, 7 of the shoulder part 5, 5. 7a
formed smaller. The mounting pin 11 is made of a solid round metal rod that is less hard than the metal pipe of the retaining ring 10 and relatively easily deformed plastically, and has tapered portions 11a, 11a formed at both ends thereof. And the outer diameter 11b of the mounting pin 11
is set to be slightly smaller than the inner diameter 10c of the retaining ring 10. Note that the inner diameter formed by the tips of the protrusions 10a, 10a... of the retaining ring 10 is the outer diameter 11 of the mounting pin 11.
It is set to be slightly smaller than b.

Here, the protrusions 10a, 10a, . . . formed on the retaining ring 10 can be easily formed by punching from the outer circumferential direction or by roll drawing, as shown in FIG.

The retaining ring 10 having such a structure is loosely fitted into the shaft hole 6 of the convex portion 2, and the mounting pin 11 is press-fitted into the retaining ring 10 through the shaft holes 7, 7 of the shoulders 5, 5, and the piece is fixed. 1 and 3 are connected like a hinge.

The reason why the mounting pin 11 press-fitted into the retaining ring 10 will not come out due to bending or prying of the pieces 1 and 3 will be explained below.

First, since the hardness of the retaining ring 10 is higher than that of the mounting pin 11, as shown in FIG. 3, as shown in FIG. Grooves 11c, 11c... are formed in the axial direction. Next, after this press-fitting, the protrusions 10a, 10 are
The grooves 11c', 11c'... in the portions corresponding to the grooves a... are plastically deformed and their widths are expanded in the circumferential direction. Then, part of the material removed by retrograde deformation due to the expansion of the circumferential width of the grooves 11c', 11c'...
Grooves 11c', 11 in portions corresponding to a, 10a...
Embankments 12, 12, . . . are formed by being raised at the boundaries between grooves 11c″, 11c”, which do not correspond to c′, . Therefore, the ridges 12, 12... reliably prevent the protrusions 10a, 10a... from coming off in the axial direction.

Although the difference in hardness between the retaining ring 10 and the mounting pin 11 is experimentally required to be 50 HV or more, they may be made of different materials, or they may be made of stainless steel materials with different composition distributions or different heat treatments. They may be made of the same material. It is desirable that the heights of the protrusions 10a, 10a, . . . be set so that the pushing force is about 2 to 7 kg and the pulling force is about 1 to 6 kg.

(Effects of the invention) As explained above, according to the wristwatch band of the invention, the mounting pin is press-fitted into the retaining ring that has an axial protrusion that projects inward, so it is easy to assemble. Moreover, the mounting pin can be securely fixed by the protruding part and the bank formed by further plastic deformation due to relative rotation in the axial direction into the groove formed by the protruding part by plastic deformation during press-fitting. This provides an excellent effect in that the attachment pin will not come off even if the watch band is bent and twisted many times over a long period of time.

[Brief explanation of the drawing]

FIG. 1 is an exploded perspective view of a mounting pin and a retaining ring used in the wristwatch band of the present invention.
FIG. 2 is a cross-sectional view taken along the line A-A in FIG. 1 of an embodiment of the retaining ring, and FIG. 3 explains how the retaining pin is press-fitted into the retaining ring to prevent it from coming off. FIG. 4 is a longitudinal sectional view showing a structure in which the pieces of a conventional watch band are connected in a hinge-like manner, and FIG. It is an exploded perspective view. 1, 3...piece, 2...convex part, 4...concave part, 5...
...Shoulder, 6,7...Shaft hole, 6a, 7a...Diameter of shaft hole, 8,10...Ring for retaining, 8b,10
b...Outer diameter of retaining ring, 8c, 10c...
...Inner diameter of retaining ring, 9, 11...Mounting pin, 10a...Protrusion, 11c...Groove, 12...
Embankment.

Claims (1)

[Scope of utility model registration request] A convex portion formed in the middle of a side edge of a piece is engaged with a concave portion formed on a side edge of an adjacent piece, and a shaft hole is drilled through the shoulder portion formed by providing this concave portion and the convex portion. The shaft hole of the convex portion is made larger in diameter than the shaft hole of the shoulder portion, and a retaining ring having an outer diameter larger and an inner diameter smaller than the diameter of the shaft hole of the shoulder portion is loosely inserted into the shaft hole of the convex portion. In a wrist watch band in which the pieces are successively connected in a hinge-like manner by inserting and fixing the mounting pin into the retaining ring through the shaft hole in the shoulder part, an axially extending inward protruding part is located in the axially intermediate part of the metal pipe. A plurality of thin strip-shaped protrusions are formed to serve as the retaining ring, and a metal round bar that is less hard than the metal pipe and relatively easily deformed plastically is used as the mounting pin, and this mounting pin serves as the retainer ring. A watch band characterized by being plastically deformed and fixed when press-fitted into a ring.