JPH0446332Y2 - - Google Patents

Description

[Detailed explanation of the idea] [Technical field of invention] This invention relates to the structure of a wristwatch case.

[Prior art and its problems] Conventionally, in wristwatches such as diver watches, an insertion hole into which a button operator of a switch is inserted is formed in the watch case, and the button operator is slidably arranged in this insertion hole. Switching is performed by bringing the tip of this button operator into contact with a contact portion inside the watch case so that it can come into contact with and separate from it.

However, in the above structure,
Dust and the like can easily get into the gap between the insertion hole of the watch case and the button operator of the switch. Therefore, there was a drawback that the switch became difficult to operate when used for a long period of time.

Furthermore, in diver watches and the like, it is particularly desirable to prevent the influence of external shocks.
Therefore, it is conceivable to place a shock-resistant member on the outside of the case, but it is not possible to place a shock-resistant member on the switch part because the switch is operated. It was not possible to prevent the deterioration of the situation.

[Purpose of the invention] This invention was created in consideration of the above circumstances, and its purpose is to prevent external shocks, prevent dust from entering the switch part, and increase the longevity of the switch. To provide a wristwatch case structure capable of maintaining good switch operability even after long periods of use.

[Main points of the invention] In order to achieve the above-mentioned purpose, this invention covers the wristwatch by integrally molding a case member made of hard synthetic resin and a switch member made of synthetic resin softer than the case member. This is how it was done.

[Example] Hereinafter, an example in which this invention is applied to a wristwatch will be described with reference to FIGS. 1 to 3.

1 in the figure is a watch case. This watch case 1
is made of metal such as stainless steel, and its top and side surfaces are covered by a bezel 2, which is an external case.At the bottom of the watch case 1, a back cover 3 is attached to an O-ring 4.
It is installed through. In addition, watch case 1
A watch glass 5 is attached to the upper part of the watch via a gasket 6, and a watch module (not shown) is arranged inside. Furthermore, stepped through holes 1a (only one is shown in FIG. 2) are formed at predetermined locations on the side wall of the watch case 1.

Bezel 2 that covers the top and sides of watch case 1
protects the watch case 1, and a bag-shaped switch cover 7 is integrally formed at a predetermined location on the side wall thereof. In this case, the bezel 2 is made of hard polyurethane rubber, and the switch cover 7 is made of soft polyurethane rubber. In other words, the hardness of polyurethane rubber is determined by the combination of isocyanate as a base material and polyol as a softening agent, and hard polyurethane rubber is made by blending 40% isocyanate with 60% polyol as a softening agent. The shore hardness is approximately
95, and the soft polyurethane rubber is a mixture of 10% isocyanate and 90% polyol, and has a Shore hardness of about 60.

When such a bezel 2 and switch cover 7 are molded together, first, the switch cover 7 is molded from the above-mentioned soft polyurethane rubber,
This molded switch cover 7 is placed in a mold for bezel molding, and in this state, hard polyurethane rubber is injected into the mold and solidified, thereby molding the bezel 2 integrally with the switch cover 7. . In this case, the joining surfaces of the bezel 2 and the switch cover 7 are fused together and firmly joined.

Further, a switch body 8 is disposed within the switch cover 7, as shown in FIG. The tip of the switch body 8 (the left end in the figure) protrudes and retracts into the watch case 1 when the switch cover 7 is pressed.
It is arranged so as to be slidable through O-rings 10, 10 in a guide pipe 9 which is fitted inside the guide pipe 9, and the tip protrudes from the guide pipe 9 into the watch case 1, and an E-ring 11 is attached to this protruding part. At the same time, the flat plate portion 8a is in contact with the inner surface of the switch cover 7 at the other end. In this case, the tip of the switch body 8 is adapted to come into contact with a contact portion (not shown) provided on a watch module in the watch case 1 so as to be able to come into contact with and separate from it by pressing the switch cover 7.

Furthermore, as shown in FIGS. 2 and 3, the bezel 2 is attached to the watch bands 13 and 1 by means of screws 12...
3 is attached to the watch case 1. The watch bands 13, 13 are made of synthetic resin, and as shown in FIG.
4 and 14, it is attached to the watch case 1.

However, according to the watch case structure as described above, the switch cover 7 is integrally formed with the bezel 2 as an external case that covers the top and side surfaces of the watch case 1.
It is possible to reliably prevent dirt and the like from entering the gap between the switch body 8 and the switch body 8, and it is possible to obtain a product with excellent durability. In this case, in particular, the switch cover 7 is molded from a softer polyurethane rubber that contains a higher proportion of softening agents than the polyurethane rubber of the bezel 2, so it has a high bonding strength with the bezel 2, and is soft, so it is easy to operate the switch. good. Moreover,
Since the bezel 2 covers the watch case 1, it can absorb shocks that the watch case 1 receives from the outside, and can protect the watch case 1 well.

In the above embodiment, the hardness of the bezel 2 and the switch cover 7 can be changed as necessary by changing the composition of the isocyanate as the base material and the polyol as the softening agent.

Further, in the above embodiment, the bezel 2 and the switch cover 7 are made of hard or soft polyurethane rubber, but the present invention is not limited to this, and the bezel 2 may be made of a different resin, for example, ABS resin. Of course, the switch cover 7 may be molded from polyurethane resin.

Furthermore, this invention is not limited to wristwatches such as the above-mentioned diver watches, but can be widely applied to other wristwatches.

[Effects of the invention] As explained above, according to the wristwatch case structure according to this invention, the case member made of hard synthetic resin and the switch member made of synthetic resin softer than the case member are integrally molded. Since the watch case is covered, it not only absorbs shock from the outside, but also prevents dirt from entering, allowing the switch to maintain good operability even after long-term use. There are advantages such as

[Brief explanation of the drawing]

The figures show an embodiment in which this invention is applied to a diver watch, in which Fig. 1 is a side view thereof, Fig. 2 is an enlarged sectional view of its essential parts, and Fig. 3 is a bottom view of the appearance. 2...Bezel, 7...Switch cover.

Claims (1)

[Scope of utility model registration request] A watch case 1 has a watch glass 5 attached to the top, a back cover 3 is attached to the bottom, and a through hole 1a in which a switch 8 is placed on the side. A wristwatch case structure comprising a resin member 2 and an outer case integrally formed with a soft synthetic resin member 7 that covers the switch 8.