JPS63206203A - Tail lock of clock band - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to the structure of a synthetic resin buckle for a band used in a wristwatch or the like.

[Conventional technology]

Recently, synthetic resins have been used as materials for the buckle bodies of bands because of their economical advantages due to mass production and their elasticity, which makes them convenient for assembly. The main body of the buckle is generally U-shaped, and a recess or hole is formed at both ends of the U-shape, and inside the recess or hole is biased to protrude outward by a pin or a spring. A spring bar or the like equipped with a sliding body is inserted. However, because the buckle body made of synthetic resin has low rigidity, both ends of the U-shape may open due to external force, and the bottle or spring bar tends to come off from both ends of the buckle body.

As one conventional example to solve this drawback,
As shown in No. 80'022, a U-shaped buckle body with a metal mounting rod press-fitted into one hole (both holes) is provided to prevent the mounting rod from coming off the buckle body. ing.

A conventional example of a band buckle fixed by press-fitting is shown in FIG. 3 as an exploded perspective view, and FIG. 4 as a partial plan view. The U-shaped buckle main body 10 is made of synthetic resin, and a stepped first hole 16 and a stepped second hole 18 are formed in the opposing first and second tips 12 and 14, respectively. ing. The stepped first hole 16 and the stepped second hole 18 each have a smaller inner diameter and a larger outer diameter of the stepped portion.

On the other hand, the mounting rod 20 for connecting the first tip 12 and the second tip 14 has a neck 22 with a small diameter at one end and a locking protrusion 24 with a larger diameter than the neck 22 at the tip thereof. It is formed. A taper that tapers toward the tip is formed on the outer circumferential side of the locking protrusion 24, and the maximum diameter of the locking protrusion 24 is larger than the small diameter portion of the stepped first hole 16. .

Further, a head portion 26 having a larger diameter than the small diameter portion of the stepped second hole 18 is formed at the other end of the mounting rod 20 . The diameter of the small diameter portion of the stepped second hole 18 is set to be large enough to allow the locking protrusion 24 and the main body portion 28 of the mounting rod 20 to be inserted therethrough.

When connecting the first tip 12 and the second tip 14 of the buckle main body 10 with this attachment rod 20, the locking protrusion 24 of the attachment rod 20 is inserted from the stepped second hole 18 to the stepped first hole. 16 side, and at that time, insert the insertion hole 62 of the band 60 into the mounting rod 20.
The annular portion 66 of the attaching rod 64 is passed through. This locking protrusion 2
After the mounting rod 2 comes into contact with the entrance of the stepped first hole 16, the mounting rod 2
Push 0 in its direction of travel. At this time, the maximum diameter of the locking protrusion 24 is larger than the small diameter portion of the stepped first hole 16, but since the buckle main body 10 made of synthetic resin is elastic, the locking protrusion 24 passes through the small diameter portion of the first hole 16 and reaches the large diameter portion by press fitting. When the locking protrusion 24 is press-fitted into the first stepped hole 16, the head 26 at the other end of the mounting rod 20 comes into contact with the step of the second stepped hole 18. Note that the same effect can be obtained by using the locking protrusions 24 at both ends of the mounting rod 20.

In this way, since the locking protrusion 24 at the tip of the mounting rod 20 is press-fitted into the stepped first hole 16, the locking protrusion 24
does not return through the small diameter portion of the first hole 16, and therefore the conventional problem of the attachment rod 20 coming off from the buckle main body 10 can be solved.

Another conventional example is shown in FIGS. 5 to 7 of Japanese Utility Model Application No. 58-80021.

In this invention, a buckle body 40 and two mounting rods 41 and 42 are integrally formed, and each of the two mounting rods has a mounting hole 41a.
A press-fitting part 42a is provided for connection.

This made it possible to reduce the cost of the buckle.

[Problem that the invention seeks to solve]

However, in the structure shown in FIGS. 3 and 4 shown at the beginning of the conventional example, a metal mounting rod 20 is required in addition to the buckle main body 10, and the shape of the mounting rod 20 is such that the head has a large diameter. 26
must be formed.

In order to fabricate a metal mounting rod having a large diameter head 26, it is necessary to cut a bar with a diameter larger than the head 26, which results in high costs and is not suitable for mass production.

Furthermore, in the structure shown in FIGS. 5, 6, and 7 shown after the conventional example, the mounting rod is divided into two parts and connected by the mounting hole 41a and press-fitting part 42a provided in each part. However, if you try to give the connecting part more than a certain level of strength, the mounting hole and press-fitting part will become large, making it impossible to actually use it as a clasp for a band.

Furthermore, since the connecting part is located in the center of the mounting rod, there is a risk that it will come off even if a slight force is applied to the mounting rod.
In terms of strength, it was impossible to use it as a clasp for a band.

Moreover, when attaching the two attachment rods on both sides to the tip of the band, the buckle body must be widened to a large extent.

The purpose of this invention is to reduce the cost by integrally making the buckle body and the mounting rod from synthetic resin material, and furthermore, by making use of the flexibility of the synthetic resin material, by slightly widening both ends of the buckle body, the band can be easily removed. (The mounting rod with the rod attached can be press-fitted into the mounting hole at the end of the buckle body, and
The objective is to obtain a buckle structure for a band that can be easily attached and has sufficient strength.

[Means for solving problems]

In order to achieve the above object, the present invention provides a mounting hole at one end of both ends of a buckle body made of an elastic synthetic resin material and having a substantially U-shape, and a mounting rod facing inward at the other end. The attachment rod has a thin-walled part at the connecting part of the buckle body, and the tip of the attachment rod is a small-diameter insertion part that is inserted into the attachment hole, and the tip of the band attaches to the attachment rod. After the rod is fitted onto the outside, both sides of the buckle body are pushed apart and the insertion portion is inserted into the attachment hole.

〔Example〕

Next, the present invention will be explained based on the drawings.

FIG. 1 is an exploded perspective view showing an embodiment of a buckle structure according to the present invention.

Figure 2 shows how to assemble the buckle. Figure 2 (a)
is a plan view before assembly, and FIG. 2(b) is a sectional view after assembly.

A U-shaped buckle body 1 made of synthetic resin has a mounting hole 1a at one end, and a mounting rod 1 at the other end.
b is provided.

At the end of the mounting rod 1b, there is an insertion portion 1d with a small diameter.

A thin wall portion 1C is provided at the connection portion with the buckle main body 1 to make it easier to bend the attachment rod 1b.

A band 2 has a hollow portion 2a at its tip.

Reference numeral 6 denotes a rod that is inserted into the sling 2b of the band 2 to connect the band and the buckle body, and has a loop-shaped attachment portion 6a at one end.

To attach the band 2 and the attachment rod 6 to the buckle body 1, bend the thin part 1c and insert the insertion portion 1 of the attachment rod 1b.
d protrudes from the outside of the buckle main body 1, and the hollow part 2a of the band 2 is fitted onto the mounting rod 1b.

When the large-diameter portion 1d reaches the position of the slit 2b at the tip of the band, insert the attachment portion 6a of the rod 6 into the slit 2b, and insert the attachment portion 6a of the rod 6 and the hollow portion 2a.
Insert into.

Next, the insertion portion 1d at the tip of the mounting rod 1b is moved to the position of the mounting hole 1a and inserted, thereby completing the mounting.

At this time, in order to move the large diameter part at the tip of the mounting rod to the position of the mounting hole, move the mounting rod on the same plane as the buckle body (in this case, the buckle body and the mounting rod It can be done smoothly and easily since no twisting force is required.

In other words, in conventional bucklocks in which the buckle body and the mounting rod are separate bodies, the tip of the band must be attached to the mounting bar (after fitting the bar outwardly, the mounting bar must be inserted into the mounting hole of the buckle body). However, finding the location of the mounting hole required skill and a lot of time.

[Effects of the Invention] As described above, according to the buckle structure according to the present invention, the buckle body and the mounting rod can be integrally made of synthetic resin material,
Costs can be lowered.

Furthermore, since they are made in one piece, the band and the rod can be easily attached to the buckle body by taking advantage of the flexibility of the synthetic resin material.

In addition, since the mounting rod is made of a single rod with no seams in the middle, it is possible to obtain sufficient strength even if it is made a little thinner.

Moreover, by opening the buckle body, the insertion portion of the attachment rod can be removed from the attachment hole, so the band can be easily replaced.

Moreover, to attach the band, simply fit the rod that attaches to the tip of the band onto the mounting rod, then with the buckle body slightly open, slide the mounting rod and insert the insertion part into the mounting hole. In general, it does not open wide and cause unreasonable deformation, as in the conventional example shown in FIG.

[Brief explanation of the drawing]

1 and 2 show an embodiment of the buckle according to the present invention, FIG. 1 is an exploded perspective view, FIG. 2(a) is a plan view of the buckle before assembly, and FIG. 2(b) 3 is an exploded perspective view of a conventional buckle, FIG. 4 is a partially sectional plan view of FIG. 3 in an assembled state, and FIGS. 5 to 7 show other conventional examples. 5 is a perspective view, FIG. 6 is a perspective view of the buckle showing a state in which the attachment rods are connected, and FIG. 7 is an enlarged view of the connecting portion of the attachment rods. 1...Buckle body, 1a...Mounting hole, 1
b...Mounting rod, 1C...Thin wall part, 1d
...Insertion part, 2...Band. 2a...Hollow part, 6...(rod, 3a
...Mounting part-- Fig. 1(b) Fig. 3 Fig. 4 Fig. 5 Fig. 6

Claims (1)

[Claims] A substantially U-shaped buckle body made of an elastic synthetic resin material has a mounting hole at one end of both sides and a mounting rod facing inward at the other end, and the tip of the mounting rod is inserted into the mounting hole. The insertion part has a small diameter, and after fitting the rod attached to the tip of the band onto the mounting rod, both sides of the buckle body are pushed apart and the insertion part is inserted into the mounting hole. Watch band buckle.