JPS58200189A - Waterproof structure for case of wristwatch - Google Patents

Abstract

PURPOSE:To enable the removal and fitting of each component of a watch from the outside of the case thereof, by providing a gap between the opening part of the drum of the case and a first compression member, and by providing a passage communicated with said gap in a second compression member. CONSTITUTION:An opening part 18 is formed through the drum 1 of a case of a wristwatch, and a gap is provided between the opening part 18 and a first compression member 22. Moreover, a small hole part 27 being a passage communicated with this gap is provided in a second compression member 23. According to such a constitution, helium gas penetrating the inside of the case is discharged from a stage part 19 provided on the drum 1 to the outside of the case through the small hole part 27 of the second compression member 23, and thereby the pressure inside the case is reduced to be equal to an outside pressure. By this constitution, the removal and fitting of each component from the outside of the case of the watch is enabled, and thus the stability and reliability of a waterproof function can be improved.

Description

[Detailed description of the invention] Regarding the waterproof structure of watch cases.

When divers work underwater for long periods of time, such as on the ocean floor, they use capsules sunk in the ocean as their base.

By maintaining the internal air of the capsule at a high pressure, the diver's body is protected from sudden changes in pressure when the diver steps out of the capsule to perform underwater work, etc. However, if the internal pressure of the capsule is increased, the nitrogen in the air will gradually dissolve into the diver's blood, and if the diver stays in the capsule for a long time, the dissolution of nitrogen into the blood will reach saturation. Nitrogen becomes present in the blood as bubbles. In such a situation, the lives of the divers inside the capsule are at risk.

The time required for the dissolution of nitrogen into the blood to reach saturation is the pressure,
That is, there is a close relationship with the depth of the water, and the time spent in the diving capsule is controlled by a decompression table to prevent bubbles from forming in the blood.

However, it is inefficient when working underwater within the time limited by the pressure reduction table.

Furthermore, in addition to being inefficient as mentioned above, when using air, the anesthetic effect of nitrogen even before bubbles are formed in the blood poses a danger to underwater work. .

For this purpose, artificial air is used in which nitrogen in the air inside the capsule is replaced with helium gas, which is inert and harmless to the human body. As a result, crew members who use the capsule as a base for underwater work can spend long periods of time inside the capsule without suffering any physical problems.

However, helium gas is highly permeable and can pass through the waterproof/IP used in watch cases.

Therefore, in a watch carried by a dialer inside a capsule using artificial air, helium gas gradually enters the inside of the watch case, increasing the internal pressure.

Father, when the capsule is brought up from the sea, the pressure inside the capsule is gradually reduced.

At this time, the internal pressure of the watch case becomes higher than the pressure inside the capsule, and the helium gas that has entered the inside of the watch case is gradually discharged to the outside of the watch case, and the internal pressure of the watch case also decreases.

However, because the rate of helium discharged from the watch case is slower than the decompression rate of the capsule, the internal pressure of the watch case becomes higher than the outside pressure, creating a pressure difference.

Due to this pressure difference, pressure acts on the watch case from the inside to the outside, and if a force that exceeds the fixing force of the parts that make up the watch case is applied, the components will fall off and be damaged. It may extend to. 1 is a cross-sectional view showing an example of a conventional timepiece that solves the gas evacuation function.

In FIG. 1, a through hole 2 is bored in a body 1 of a watch case. The through hole 2 has a first step 3 on the outside and a second step on the inside.
It has a stepped portion 4. An O-ring 8 is attached to the shaft 7 of the pin member 6 having the flange 5, and the shaft T of the pin member 6 is inserted into the through hole 2. - Groove portion 9 formed on the opposite side of the flange portion 5 of the pin member 6 and the second portion of the through hole 2
A spring member 10 is fitted between the stepped portions 4 . (The member 10 is engaged with the inner surface of the body 1 and serves to prevent the pin member 6 from being removed, and also pulls the pin member 6 inward.
As a result, the O-ring 8 is compressed by the flange 5 and performs a waterproof function. When a watch is kept in a high-pressure helium gas capsule for a long time, the gas gradually enters the watch case by penetrating the watch case, creating a relatively high pressure inside the watch case. During the process of reducing the pressure inside the capsule, the pressure inside the watch case is high, so the pin member 6 is pushed outward against the elasticity of the spring member 10, and the compression of the O-ring 8 is relaxed, causing helium gas to flow out. The helium gas that has entered the inside of the watch case is discharged until the internal pressure of the watch case becomes equal to the outside pressure.

However, although this structure solved the issue of gas exhaust function, it also had the disadvantage of having to open the back cover and take out the module to replace the O-ring each time the watch was used for a long period of time. Moreover, opening the back cover means opening and closing the most important part of a wristwatch used for diving, etc., which has a waterproof function, and the waterproof function lacks stability.

The present invention improves these drawbacks and allows waterproof O2 to be installed from the outside without impairing the gas evacuation function and without opening or closing the back cover of the watch case.
The purpose is to improve the stability and reliability of the waterproof function of wristwatches used for diving etc. by replacing rings etc.

Hereinafter, the present invention will be explained with reference to Examples.

FIG. 2 shows a cross-sectional view of a watch case having a waterproof structure according to the present invention. An elastic packing 12 is fixed between the glass 11 and the body 1 while maintaining watertightness. glass 11
A register ring 13 is disposed above the body 1 to which the body 1 is fixed, and the register ring 13 is pushed upward by a register ring spring 14 fixed to the body 1.
It engages with a part of the holder and has a click action, making it rotatable. The back cover 15 is screwed onto the body 1 while compressing the cover/16 and maintaining waterproofness. An opening 1B is formed through the barrel 1, and a threaded portion 17, a third step 19', and a hole 20 are formed in the opening 18. Third
A QIJ7 gear 8 fitted onto the shaft portion 21 of the first compression body 22 is disposed in the step portion 19, and the shaft portion 21 of the first compression body 22 is freely axially movable in the hole portion 20. is inserted into. 1st
A coiled spring member 25 is in contact with the outer surface of the compression body 22, and a second shaft portion 24 formed on the second compression body 23 is fitted into the inner circumference of the spring member 25. The compression body 23 is attached to the opening 18 by screwing into the threaded portion 17. Therefore, the first compressed body 22 is the second compressed body 23
The first compression body 22 compresses the OIJ 7 and 8, thereby ensuring waterproofness. The second compression body 23 is provided with a small hole 27 at the axis and a recess 28 which is used when the screw at the tip is rotated. Similarly, a gap is provided between the first compression body 22 and the barrel 1, and the small hole portion 27 is provided so as to communicate with the gap.

FIG. 3 is a sectional view of the watch case showing a state in which helium gas that has entered the inside of the watch case is being discharged. P indicated by an arrow in FIG. 3 is the internal pressure of the watch case acting on the first compression body 22. The internal pressure P acts from the inside to the outside of the watch case, and first compresses the first compression body 22.
The spring member 25 is pressed through. At this time, by pressing the spring member 25, the first compression body 22 moves toward the outside of the body 1, and the 0s/g 8 is moved between the third step 19 of the body 1 and the first compression body 22. is decompressed. When the O-ring 8 is decompressed, the helium gas that has entered the watch case is discharged from the third step 19 of the body 1 through the small hole 2T of the second compression body 23 to the outside of the watch case. Ru.

Further, FIG. 4 is a sectional view of a timepiece showing another embodiment of the present invention. In FIG. 4, the outer shell 29 which is the second compression member
is fixed to the inner shell 30 with a screw or the like (not shown), and the inner shell 30 is provided with an opening 18 having a third step 19, and the inside of the inner shell 30 is opened from the opening 1B. A hole 20 is bored through the hole. Osu/g 8 to the first shaft portion 21
The first compressed body 22 fitted with the first compressed body 22 is inserted from the outside through the opening 18, and the first shaft 21 is inserted into the hole 20 so as to be able to freely pivot. Next, with the spring member 31 in contact with the first compression body 22 from the outside of the opening 18, the outer shell 29 is inserted into the inner shell 30.
Fixed to. At this time, the spring member 31 is pushed inside the outer shell 29, and the spring member 31 is pushing the first compression body 22 inward.

The gas/gas 8 is compressed by the first compressor 22 and maintains its waterproof property.

Note that gaps serving as air flow passages are provided between the first compression body 22 and the inner shell 30, and between the inner shell 30 and the outer shell 29.
When the pressure inside the watch case becomes higher than the outside pressure, pressure P acts from the inside to the outside of the watch case. At this time, the O-ring 8 is decompressed because the pressure P acts on the first compression body 22 and pushes the spring member 31 outward.

When the compression of the 0s/g 8 is released, the helium gas that has entered the watch case is discharged from the third step 19 through between the inner case 30 and the outer case 29, and the inner pressure of the watch case decreases. The pressure is reduced until it equalizes the outside pressure.

With the above configuration, each part constituting the waterproof structure of the present invention can be attached and detached from the outside of the watch case, and watches such as watches can be replaced without opening the back cover. Therefore, it is possible to create a diving watch case with improved stability and reliability in waterproof function.

[Brief explanation of drawings]

Fig. 1 is a cross-sectional view of a conventionally used watch, Fig. 2 is a cross-sectional view showing the waterproof structure of the watch according to the present invention, and Fig. 3 is a cross-sectional view showing the waterproof structure of the watch according to the present invention. FIG. 4 is a cross-sectional view showing a state in which the pressure is reduced until it becomes equal to the pressure, and FIG. 4 is a cross-sectional view of a waterproof structure showing another embodiment of the present invention. DESCRIPTION OF SYMBOLS 1...Body, 2...Through hole, 3...1st step part,
4. Second step portion, 5.. Flange portion, 6.. Pin member 7. Shaft portion, 8..0s/g, 9.. Groove portion, 10
・Spring member, 11... Glass, 12... Elastic packing, 13 Register ring 14 Register ring spring, 15... Back cover, 16... Packing, 17...
Threaded portion, 18 Opening portion 19...Third step portion, 20 Hole portion, 21. First shaft portion, 22... First compression body, 23...
- Second compression body, 24... Second shaft part, 25 - Spring member, 26... Threaded part, 27... Small hole part, 2B...
Recessed portion, 29...Outer shell 30...Inner shell, P...Internal pressure,
21... Spring member. Figure 3 Figure 4

Claims (1)

[Claims] an O ring disposed on a step formed in the opening of the body of the wristwatch case; a first compression member that compresses the O ring;
It is composed of a spring member disposed outside the first compression member and a second compression member that compresses the spring member, and there is a gap between the opening of the body and the first compression member. established,
A waterproof structure for a wristwatch case, characterized in that the second compression member is provided with a passage communicating with the gap.