JPH0221933Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to a wristwatch band attachment structure.

Traditionally, watch bands have been made by inserting a spring bar into a through hole provided at the end of the band, and fitting the ends of the spring bar into holes provided on the inner surface of a pair of bottom parts formed on the side of the watch case. It is attached to the watch case by

However, in such a band attachment structure, the end of the spring bar must be fitted into the hole in the bottom part while being compressed, making the band attachment work extremely troublesome. ,
Since it has a structure in which a coil spring is housed in a hollow rod and ejector pins are inserted into both ends of the hollow rod to be pushed outward by the coil spring, the production cost is high. There was also the problem that the spring bar would come off the base when strong force was applied to the watch.

This idea was created in view of the above-mentioned circumstances, and its purpose is to make it possible to attach the band easily and with good workability, to reduce costs, and to prevent the band from coming in from the outside. To provide a wristwatch band mounting structure that can prevent the watch from coming off the watch case due to impact.

That is, the band attachment structure of this invention provides a through hole that is continuous in a straight line between a pair of bottom parts formed on the side of the watch case and a band end inserted between the pair of bottom parts, and A band attachment having a locking convex portion formed inside the through-hole, and a locking recess portion having a length spanning the band end portion and the pair of bottom portions and locking with the locking convex portion at the tip end thereof. A pin is inserted from the outer surface side of one bottom portion, and the locking recess is locked with the locking protrusion in the through hole. According to this band mounting structure, the band mounting pin is inserted into the through hole. By simply inserting the band into the watch case, the watch case and band can be securely fixed and the band can be prevented from easily coming off from the watch case due to impact or the like.

An embodiment of this invention will be described below with reference to the drawings.

In Figures 1 and 2, 1 is a synthetic resin watch case, 2a and 2b are a pair of bottom parts integrally formed on the sides of the watch case, and 3 is a metal or synthetic resin band. , 4 is a metal band attachment pin, and this band attachment pin 4 replaces a conventional band attachment spring bar. 5a,
Reference numeral 5b indicates a through hole that penetrates through the inner and outer surfaces of the outer parts provided in the pair of outer parts 2a and 2b, and 6 indicates a through hole extending over the entire width of the end of the band to be inserted between the pair of outer parts 2a and 2b. It is a through hole provided,
These through holes 5a, 5b and 6 are provided so as to be in a straight line when the end of the band 3 is inserted between the bottom portions 2a and 2b, as shown in FIG. Further, the through hole 5a provided in one of the pair of bottom portions 2a, 2b and the through hole 6 provided at the end of the band 3 are formed in a straight hole shape, and both of the holes 5a and 2b are straight holes. The straight through holes 5a and 6 have the same diameter. On the other hand, the through hole 5b provided in the other bottom portion 2b is connected to the straight through hole 5a,
It is a stepped through hole which has a smaller diameter than the diameter A of No. 6 and has a protrusion 7 that protrudes into the hole at a portion closer to the inside surface of the bottom than the middle part. It is formed over a period of time. The band attachment pin 4 is formed by adding a metal rod and has a shape as shown in FIG.
It is formed to have a length extending over the parts 2a and 2b, and a protrusion is provided at a position corresponding to the protrusion 7 on the distal end side, that is, the part to be inserted into the stepped through hole 5b of the other bottom part 2b. Locking recess 8 into which part 7 fits
is formed around the entire circumference. Further, the portion on the proximal end side of the locking recess 8 is shaped like a straight rod over its entire length, and the diameter a of this straight rod portion is slightly smaller than the diameter A of the straight through holes 5a and 6. It is a small path. On the other hand, the diameter b of the portion of the band attachment pin 4 on the distal side of the locking recess 8 is slightly smaller than the diameter B of the large diameter portion of the stepped through hole 5a, and the diameter b of the small diameter portion in which the protrusion 7 is formed is slightly smaller than the diameter B of the large diameter portion of the stepped through hole 5a. The diameter C is larger than the diameter C, and the diameter c of the locking recess 8 portion is slightly smaller than the diameter C of the small diameter portion of the stepped through hole 5b. Further, the tip of the band attachment pin 4 is tapered, and the diameter d of the tip is smaller than the diameter C of the small diameter portion of the stepped through hole 5b.

Therefore, the attachment of the band 3 is done by attaching the pair of bottom parts 2.
Insert the end of the band 3 between a and 2b and remove the end part 2.
The through holes 5a and 5b of the bands a and 2b and the through hole 6 at the end of the band are aligned so that they are in a straight line, and in this state, one of the bottom portions 2 having the straight through hole 5a is aligned.
This is done by press-fitting the band attachment pin 4 into the through-holes 5a, 6, and 5b from the outer surface side of a.
In this case, since the band attachment pin 4 has a tapered tip, the stepped through hole 5
Enter the small diameter part b. Since the bottom portion 5b is made of synthetic resin, the small diameter portion of the stepped through hole 5b is pushed by the tapered surface of the tip of the band attachment pin and expands due to the elasticity of the resin. 4 can be passed through the small diameter part and pushed into the large diameter part from the locking recess 8, and the small diameter part returns to its original state after the distal part of the band attachment pin 4 has passed. The small diameter portion, that is, the protruding portion 7 is the locking recess 8 of the band attachment pin 4.
The band attachment pin 4 is fitted and engaged to prevent the band attachment pin 4 from shifting in the axial direction.

That is, according to this band attachment structure, the through holes 5a, 5 between the bottom portions 2a, 2b and the end portions of the band 3
The band 3 can be attached with a simple operation of aligning b and 6 and press-fitting the band attachment pin 4. Therefore, the band 3 can be attached with good work efficiency, and the band attachment work can be mechanized. Since it is also easy, the band attachment can be done by an automatic machine. In addition, the band attachment pin 4 is a one-piece piece and can be manufactured at a lower cost than the conventionally used spring bar, so the cost can be reduced. Since the band 3 is prevented from coming off by engagement with the protrusion 7 in the through hole 5b, the band 3 is also difficult to come off.

In the above embodiment, the protrusion 7 that fits into the locking recess 8 of the band attachment pin 4 is inserted into the through hole 5 of the bottom part 2b.
b. However, if the band 3 is made of synthetic resin, the protrusion 7 may be formed in the through hole 6 at the end of the band 3. In that case, the protrusion 7 may be formed in the fifth
It may be formed at the end of the through hole 6 as shown in the figure, or it may be formed inside the end of the through hole as shown in FIG. In this case, watch case 1
may be made of metal. Further, the band attachment pin 4 has a cut 9 in the axial direction from the tip to the locking recess 8, as shown in FIGS. 7 and 8, and is capable of elastically expanding and contracting the tip side from the locking recess 8. However, if this band attachment pin 4 is used, either the watch case 1 or the band 3 may be made of metal. Further, the band attachment pin 4 and the through holes 5a, 5b, and 6 are not limited to round shapes, but may also be square shapes.

As mentioned above, this idea involves molding at least one of the watch case and the watch band out of synthetic resin, and inserting a locking protrusion with a smaller diameter than the through hole into the through hole of the watch case and the watch band. It is formed integrally on the entire inner circumference of the hole to reduce manufacturing costs, and a band mounting pin having a locking concave portion formed corresponding to the locking convex portion is inserted into the through hole, and the inner circumference of the through hole is The locking protrusion formed on the entire surface and the locking recess of the band mounting pin are locked in a press-fit state using the elastic deformation of the synthetic resin, and this locking force firmly attaches the watch band to the watch case. Therefore, according to this invention, the band can be attached easily and with good workability, and the cost can be reduced.In addition, the watch band can be firmly attached to the watch case so that the band will not easily come off from the watch case. It can be done.

[Brief explanation of the drawing]

Figures 1 to 4 show an embodiment of this invention. Figure 1 is an exploded perspective view, Figure 2 is a cross-sectional plan view, Figure 3 is a cross-sectional view of the through hole, and Figure 4 is a cross-sectional view of the through hole. It is a top view of a band attachment pin. FIGS. 5 and 6 are cross-sectional plan views showing other embodiments of this invention, respectively. FIGS. 7 and 8 are plan views showing modified examples of the band attachment pin, respectively. 1...Watch case, 2a, 2b...〓part, 3...
...Band, 4...Band mounting pin, 5a, 5b,
6...Through hole, 7...Protrusion, 8...Locking recess.

Claims (1)

[Scope of utility model registration request] In a wristwatch in which at least one of a watch case and a watch band is molded from synthetic resin and the watch band is fixed to the watch case, a pair of
A through hole is provided in a straight line between the part and the end of the watch band inserted between the pair of bottom parts, and a through hole is provided on the inner circumferential surface of a part of the through hole on the side formed of synthetic resin among the through holes. A locking convex portion having a diameter smaller than the diameter of the through hole is formed in the through hole, the locking convex portion has a length spanning the end portion of the watch band and the pair of bottom portions, and has a tapered tip portion, and has a length extending over the end portion of the watch band and the pair of bottom portions. A band mounting pin that has a locking protrusion and a locking recess that locks,
Press fit from the outer surface side of one bottom part, and insert the bottom part using the tapered shape of the tip so that the locking recess locks with the locking convex part in the through hole. A watch band mounting structure in which an end portion of the watch band is attached to a watch band.