JPH088652Y2 - Nakadome clasp for watch band - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to an improvement of the clasp of a watch band.

[Conventional technology]

We have disclosed the structure of Nakadome (hereinafter referred to as SN type Nakadome) in Japanese Patent Laid-Open No. 168302/1986. Although not explained in detail here, the feature of this SN type Nakadome is that even if the operating ends of the operating members are pushed one by one, the locked coupled state remains as it is and the locked coupled state is released when both are pressed simultaneously. In addition, the movable locking member bounces vigorously at the time of simultaneous pressing.

However, the adjustment of the flip-up is difficult and, until now, the flip-up structure itself has not been accurately grasped.

Fig. 3 shows the structure of Nakadome in the SN system up to now.
Is a temporary hook metal fitting, 6 is a temporary hook pin, 8 is a connecting pin which is a shaft of the movable locking member, 10 is a hook, 10a is a snap piece, 14 is a base, 20 is an upper lid of the movable locking member, and 22 is an upper part. It is a plate.

Nakatome should be as thin and small as possible to make the best use of the watch band design. In the case of the SN system Nakadome, it has the functions of locking and jumping up, so the storage space for that is inevitably larger than the conventional one.

Therefore, considering a structure that is thin and the upper lid is small within a range where temporary fastening and locking connection can be made and a structure that avoids the spine 22b of the upper plate 22, a structure as shown in FIG. 3 is obtained. Although I was not aware at this point, this is because the snap piece 10a, the snap end 22a of the upper plate, the point A to be locked,
From the straight line connecting the shaft center B of the temporary hook pin, the shaft center of the connecting pin is located at the position on the drawing.

[Problems to be solved by the device]

However, conventionally, in the structure as shown in FIG. 3, which was considered as a structure in which the middle clasp can be made as thin and small as possible, the method of splashing the upper lid was bad. On the other hand, when the position and shape of the snap piece were changed to make the locking connection firm, the top lid came to spring up. However, if the locking connection is made rigid, the resistance when pushing the flip-up lever in order to make it spring up is increased, and the lever is forced to operate.

If the top lid easily jumps up and rises vertically to the band surface, you can smoothly enter the next act of pinching the top lid, removing the temporary hook, and removing the band. that is,
It was also questioned that if the operator had more power to push the operation part, it could be easily removed rather than the next action.

Therefore, the purpose of the present invention is to solve these problems and provide an SN system clasp that can be removed with a soft touch.

[Means for solving the problem]

Therefore, in the present invention, in the clasp metal fitting of the SN method disclosed in Japanese Patent Laid-Open No. 61-168302, the locking point of the snap piece of the movable locking member, the axial center point of the temporary hooking pin, and the movable top lid are moved. Nakadome was characterized by arranging and arranging so that the three axial center points were on substantially the same line.

〔Example〕

 Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

FIG. 1 shows an SN type clasp with a structure according to the present invention.

FIG. 2 is an external view of the same, and FIG. 2 (a) shows a fixed locking member and FIG. 2 (b) shows a movable locking member.

In FIGS. 1 and 2, 2 is an upper lid, 4 is a temporary hook metal fitting, 6 is a temporary hook pin, 8 is a connecting pin which is a shaft of a movable locking member, 10 is a hook, 10a is a snap piece, and 10b is It is a combined piece. Reference numeral 12 is an upper plate, 12a is a snap end, 14 is a base, 14a and 14b are side plates, 16 is a flip-up lever which is a second operation portion, and 18 is a lock lever which is a first operation portion.

In the clasp of the present invention, when the clasp is closed, it is on a straight line connecting the locking point (A) between the snap piece 10a and the snap end 12a and the axial center point (B) of the temporary hook pin 6. The structural arrangement of the upper plate 12 and the curvature of the upper lid 2 are determined so that the axial center point (C) of the connecting pin 8 comes.

In the case of FIG. 3, the axial center point (C ′) of the connecting pin 8 is not located on the extension line of the straight line connecting the locking point (A) and the axial center point (B) of the temporary hooking pin. In this case, there is an axial center point (C ') on the upper side of the drawing.

The structure shown in FIG. 3 is a form that was inevitably made when the SN system Nakadome was prototyped so far, rather than merely as an explanatory diagram.

Because Nakadome of the band is an accessory part of the band and watch, I thought about making it as large as a conventional clasp as the basic structure.

However, in the case of the SN system, the lock lever and the flip-up lever are added to the functional parts that are not available in the past, so it is necessary to take up storage space for them.

Therefore, the shape of the upper lid 20 is the back 22 of the upper plate 22 which is also a storage frame.
The structure is restricted to the part b, and by making the upper lid 20 itself as small as possible, the connecting pin is lifted from the straight line connecting A and B.

The mechanical relationship diagrams of FIG. 1 and FIG. 3 are FIG. 4 (a) and FIG. 4 (b), respectively.

In FIG. 3, when the top lid 20 is closed, the snap piece 10a is pushed in. Therefore, in FIG.
The force of F ₀ toward the point is applied. Assuming that the angle at this time is ∠C′AB = α ∠BC′A = β, the force of F ₁ applied to AC ′ via the upper lid 20 is F ₁ = F ₀ / cosα, while the temporary hook 4 is Since the force of F ₃ works by being caught, the composite force F ₂ of F ₁ and F ₃ acts at point C ′, F ₃ = F ₁ cosB F ₂ = F ₁ sin β.

Therefore, due to the force of F _2, the point C ′ tends to move in the direction of C ″, but in FIG. 3, the upper plate 22 is an obstacle, and the curvature and rigidity of the upper lid 20 also cause a problem. , The axial center point of the connecting pin remains at C '.

Incidentally, the condition for the F ₂ becomes "0" because it is _{F 2 = F 0 × sinβ /} cosα, sinβ / cosα = 0 sinβ / = 0 β = 0 That is, the A · B · C 'is a straight line I wish I had it.

This is the same as the configuration of FIG. 4 (a), and the point C is F ₂
Is the point of "0".

The fact that F ₂ is “0” means that the movable shaft of the movable locking member does not move and is stable no matter how much force F ₀ acts on A to B.

This Nakadome system is a system that can store elastic force in several places. In FIG. 1, it is the snap piece 10a, the temporary hooking pin 6, and the upper lid 2.

The structure capable of stably storing this elastic force can be said to be the structure shown in FIG. 1, that is, FIG.

On the other hand, in the case of FIG. 3, it becomes unstable because the force of F ₂ is applied to the point C ′.

For example, when the top lid 20 is removed, the locking point A gradually goes up. The position of point A changes little by little, but in the case of Fig. 3, the constraint that prevented movement of point C ″ with that change was taken, and point C ′ of point C ″ was changed by the force of F ₂ . Move towards you.

Due to this movement, the elastic force accumulated until then gradually escapes.

In the case of Fig. 1, since point C is a stable point, even if point A moves a little, point C remains the same, and elastic force is retained until the locking connection is released, and it is released all at once, so the top lid is released. Will jump up vigorously.

That is, the structure is such that the elastic force of the entire system of the clasp is effectively used.

As shown in FIG. 5, when the upper lid 24 is closed, the hook
The snap piece 26a of 26 is caught on the snap end (Fig. 5 (a)), and the snap piece 26a is pushed in (the fifth piece).
The upper lid 26 is closed (Fig. 5 (b)) (Fig. 5 (c)).

When removing this, FIG. 5 (c) → FIG. 5 (b)
→ Proceed in the reverse direction as shown in Fig. 5 (a). At this time, the elastic force is stored in the snap piece 26a, and when the upper lid 26 is removed, this elastic force is expelled at once, so the upper lid will spring up. .

However, if an elastic force for jumping up is to be created only by the structure shown in FIG. 5, the tighter the locking between the snap piece 26a and the snap end 26b, the tighter the snap piece 26a will bend when it is removed. Power is stored in excess and jumps up vigorously.

However, in the case of the SN type clasp, the locking force is released by pressing the flip-up lever with the fingertip, so the locking force becomes tight and the fingertip dents when the pressing force exceeds 1 kg. It becomes difficult to remove the top lid.

In other words, if only the elastic force of the snap piece is used, it would be difficult to flip up the top lid and remove the clasp from the clasp.

When the structure shown in FIG. 3 is adopted, the elastic force of the snap piece is used, so that this problem remains unchanged.

However, as shown in FIG. 1, if the structure that allows the elastic force of the upper lid and the entire system to be drawn out and utilized effectively is adopted, in addition to the elastic force of the snap piece, this can be used, so the locking force is not so strong. Well, the top lid has popped up enough.

In summary, the SN system Nakadome is a system of Nakadome, and there are several parts that store elastic force.

Since it is this elastic force that causes the upper lid to spring up, in order to force the upper lid to spring up with a light force, firstly, the elastic force of the Nakadome system is increased.

For example, a spring material with a high elastic force is used as a hook member, or the upper lid is made of the same material, and the structure is such that the spring force such as length, width, and plate thickness increases.

Of course, Nakadome is an exterior part, and it can bring out a high-class feeling by giving it a solid feeling. From that point,
There are restrictions on increasing the elasticity of the top lid depending on the size and shape.

It is also conceivable to use a portion where the snap piece is engaged and locked as a pin to store the bending force as an elastic force, or to consider the shape of the temporary hook metal so that the bending force of the temporary hook pin can be further extracted. For example, as shown in FIG.
Put the dowel inward at the center position of. When the temporary hook metal fitting 30 is hooked on the temporary hook pin 32, the pin is bent by being pushed by the dowel 30a, and the elastic force is stored here. (34 and 36 are side plate portions of the fixed locking member) Of course, this dowel may be provided with some projection inward from the central portion of the temporary hanging portion of the temporary hanging metal even if it is not the dowel.

The second is to improve the elastic force by devising the shape of the hook and the like, and the third is to efficiently draw out the elastic force to the force of the upper lid popping up.

For example, if the locking point is rough and is caught, the force will be lost there and it will not spring up. In the case of the present invention, this third point is improved.

Structurally, the upper lid draws an arc as shown in Fig. 1,
In addition to the thing that the drawing goes up and down linearly from the middle,
As shown in FIG. 7A, the curvature of the arc of the upper lid 2 is reduced from the middle, and FIG. 7B where the original curvature is reduced.
A shape like this is conceivable. In addition to this, it is also conceivable to reduce the back of the upper plate 12 by cutting it.

In the case of FIG. 7 (b), the clasp itself becomes thick and there are no variations in design, but if the present invention is realized with a reduced thickness, then FIG. 1 or FIG. The structure is as shown in (a).

Although the structure of the clasp according to the present invention has been described above, the relationship (points A, B, and C are arranged on a straight line) in the present invention may not be satisfied due to manufacturing errors. That is, the point C may be located above the straight line as in the conventional example. Therefore, considering that point, C
It is desirable to arrange the points on a straight line or slightly below.

[Effect of device]

As is clear from the above description, according to the present invention, in the SN type clasp, it does not rely only on the elasticity of the snap piece,
Since the elastic material of the upper lid can be used to pull it out, the upper lid can be jumped up by lightly operating the operating lever (jumping lever) at the same time as the lock lever. For this reason, it has a structure that takes full advantage of the fact that it can be removed with one touch compared to the conventional clasp that is disengaged with a claw, which is a feature of the SN method.

[Brief description of drawings]

1 is a cross-sectional view of a clasp fitting according to the present invention, FIG. 2 is an external view of the clasp fitting of FIG. 1, FIG. 2 (a) is a fixed locking member, and FIG. 2 (b) is Movable locking member, FIG. 3 is a sectional view of the clasp, which is in contrast to the present invention, and FIGS. 4 (a) and 4 (b).
Is a relational diagram showing the mechanical relations of FIGS. 1 and 2 as an element, and FIGS. 5 (a) to 5 (c) are explanatory views showing a state in which the snap piece and the snap end are locked and unlocked. Figure, Figure 6 (a)
7A to 7C are explanatory views of a temporary hooking mechanism for supplementarily explaining the present invention, and FIGS. 7A and 7B are cross-sectional configuration diagrams of another embodiment of the present invention. A: locking point, B: axial center point of temporary hook pin, C, C '...
The center point of the movable locking member.

 ─────────────────────────────────────────────────── ───Continued from the front page (56) References Microfilm (JP, U) taken from the specification and drawings attached to the application for Japanese Patent Application No. Sho 63-7646 (No. 1-112709). )

Claims (1)

[Scope of utility model registration request] 1. A clasp fitting for a watch band, wherein a fixed locking member mounted on one of the watch bands and a movable locking member pivotally supported on the other side of the watch band are locked and coupled. When one of the fixed locking member and the movable locking member is the first locking member and the other is the second locking member, the first locking member is a locking piece that acts as a hook. , A flip-up piece that receives a pushing-up force, and the second locking member is
A first operating member and a second operating member that are arranged to be movable in the width direction of the timepiece band and are urged outward in the width direction of the timepiece band;
The operation member includes a lock engaging portion that engages with and engages with the lock piece, and the second operation member includes a push-up portion that pushes up the flip-up portion, and is released simultaneously with the first operation member. In a clasp fitting for a watch band, wherein the locking engagement between the first locking member and the second locking member is released by an operation, a snap piece is provided on the movable locking member. And a temporary hook, and when the movable locking member and the fixed locking member are locked and coupled, the snap piece is locked to the fixed locking member, and the temporary locking metal. In the timepiece band, the three points, that is, the axial center point of the temporary hook pin on which is temporarily suspended and the axial center point of the movable shaft of the movable locking member are arranged substantially on the same line. Fasteners.