JP2681870B2 - Nakadome metal fittings for watch bands - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a clasp fitting for a watch band or a clasp fitting for a bracelet, and more particularly to a novel structure of a hanging portion thereof.

[0002]

2. Description of the Related Art A clasp fitting for a watch band of this type has been hitherto generally worn by an elastic frictional force of an elastic latching claw,
In recent years, a so-called one-touch type hanging structure, for example, as described in Japanese Utility Model Publication No. 2-25290 has been proposed.

[0003]

However, the former is problematic in that the latching portion is loosened due to abrasion, and the latter is complicated in structure and requires a large number of manufacturing steps and requires high precision. There is.

[0004]

The present invention relates to a two-fold or three-fold type clasp fitting for a watch band, which is interposed in the middle of the watch band and has a hooking mechanism and is foldably and unfoldably mounted. In order to solve such a problem, an elastic ring that exposes the side portion is attached to one of the engaging mechanisms in a replaceable manner, and a catching portion that engages and disengages with the exposed side portion of the elastic ring is provided on the other side. is there.

[0005]

In the clasp fitting for a watch band of the present invention, an elastic ring that exposes a side portion is replaceably attached to one of the hanging mechanisms.
On the other hand, a hooking portion for hooking and unhooking is provided on the exposed side of the elastic ring, and the elastic ring is hooked by utilizing the elastic deformation force. Mutual friction is reduced as much as possible by the deformation of the elastic ring, so that the other engaging portion can be reliably engaged and disengaged without being worn. Further, if the elastic force deteriorates due to the metal fatigue of the elastic ring, the initial elastic force can be restored by a simple operation of replacing the elastic ring.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment will be described below with reference to an example of a three-fold type double door open type Nakadome.

FIGS. 1 to 3 show a first embodiment of the present invention in which two side members 2 and 2 are provided in parallel on both sides sandwiching the shorter side of a rectangular connecting plate 1 in the central portion. Forming the frame member 3,
A pin 5 is attached to one end of each half-length open / close plate 4, 4 of the frame member 3 so that it can be folded and unfolded at each open end of the frame member 3.

A paragraph 6 is formed on the upper surface of the rectangular connecting plate 1 so that the side members 2 and 2 are arcuate and the other side is open, and a gap 7 is formed between the ends of the paragraph 6. An endless circular elastic ring 8 is fitted and a leg plate 9a having a leg portion 9a which is smaller and higher than the inner diameter of the elastic ring 8 by the diameter of the ring material is provided on the bottom portion. Is attached to the screw holes 10a, 10b provided in communication between the rectangular connecting plate 1 and the leg portions 9a with screws 11 which are screwed from the back side. One of the hanging parts that exposes the side part of 8 is constituted. Reference numeral 12 is a stopper rod in the gap 7 of the elastic ring 8 for preventing the ring from rotating and shifting.

At the other ends of the opening / closing plates 4 and 4, mounting halves 14 for mounting the respective half watch bands 13a and 13b are provided at the front ends thereof, and the mounting barrels 14 abut on the rectangular connecting plate 1. In the lower half of the hollow part, and the elastic ring 8 of the missing part 15 is provided.
The guide wall 16 that is inclined on both sides and the concave hooking portion 17 that follows the guide wall 16 are provided on the vertical wall surface facing to the other side of the hooking portion.

In the clasp having the above-mentioned structure, the other ends of the attached watch bands 13a and 13b are attached to both sides of the watch body (not shown). When the open and close plates 4 are folded one by one, the exposed side of the elastic ring 8 is pushed by the guide 16 and elastically deformed as shown in FIG. 3 (b). And rectangular transfer board 1
When the recessed hooking portion 17 reaches inside, the recessed hooking portion 17 returns to its original shape as shown in FIG.
Therefore, the respective opening / closing plates 4 and 4 are folded and hooked on the frame member 3. When the hooking is released, if the opening / closing plate 4 is pulled up against the elastic force of the elastic ring 8, the elastic ring 8 is pushed into the rectangular connecting plate 1 again by being pushed by the slope of the guide portion 16, so that the guide portion
The top part of 16 passes through the side part of the elastic ring 8 and moves upward to release the hook.

FIG. 4 shows a second embodiment, in which the elastic ring 8 is provided on the lower surface of each of the opening / closing plates 4 and 4 near the tip thereof.
The elastic plate 8 is fitted to the side plate 18 and is pressed down by the screw 11 so that the side portions of the elastic ring 8 are exposed on both sides of the opening / closing plates 4 and 4 in the longitudinal direction. This is the same as the first embodiment except that a retaining groove 20 with a guide portion 19 is formed so that the exposed side portion of the elastic ring 8 is fitted and retained when folded.

5 (a), 5 (b), 5 (c) and 5 (d) show other examples of the shape of the elastic ring, particularly those shown in FIGS. 5 (c) and 5 (d) are elastic. By forming a paragraph portion that fits with the protruding portion 8a of the ring 8, it is possible to prevent rotation and misalignment and stabilize it. FIG. 6 shows another embodiment in which a concave groove 21 is formed on the exposed side of the elastic ring and a convex hooking portion 22 is formed on the opening / closing plate 4 side.

[0013]

As described above, the clasp fitting of the present invention is
The elastic ring that exposes the side portion is attached to one of the engaging mechanisms in a replaceable manner, and the engaging portion that engages with the exposed side portion of the elastic ring is provided on the other side. There is an effect that it is possible to provide a clasp fitting for a watch band, which has a sure hooking force while preventing wear of members during detachment as much as possible. Since the elastic ring can be easily replaced, it has an effect that the initial applying force can be maintained for many years.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a clasp metal fitting of a first embodiment of the present invention in a semi-developed state before a band is attached.

FIG. 2 is a partially enlarged perspective view showing the elastic ring and the suppressing plate before they are attached.

FIG. 3 (a) is an enlarged end view at the time of hooking, and FIG. 3 (b) is an enlarged end view when the opening / closing plate is being folded or unfolded.

FIG. 4 is a partial perspective view showing one side opening / closing plate and a frame member of a second embodiment.

5A to 5D are plan views showing examples of the shape of a ring.

FIG. 6 is a partially enlarged sectional view showing a hooked state of a third embodiment.

[Explanation of symbols]

 1 is a rectangular connecting plate 2, 2 is a side member 3 is a frame member 4, 4 is an opening / closing plate 5 is a pin 6 is a paragraph 7 is a gap 8 is an elastic ring 9 is a suppressing plate 9a is a leg 10a, 10b is a screw hole 11 is a screw 12 is a stopper rod 13a, 13b is each half of the watch band 14 is a mounting tube 15 is a missing part 16 is a guide part 17 is a concave hook part 18 is a paragraph part 19 is a guide part 20 is a hook groove 21 is a concave part Groove 22 is a convex hook

Claims (1)

(57) [Claims] 1. A two-fold or three-fold type clasp for a watch band, which is interposed in the middle of a watch band and has a hooking mechanism and is foldably and unfoldably mounted, has a gap in one of the hooking mechanisms. A watch band characterized by having an elastic ring elastically deforming and having a side part exposed so that the elastic ring can be exchanged, and the other side having a hooking part for hooking on and off the exposed side part of the elastic ring. Fasteners.