JPS61256276A - High pressure water-proof apparatus of back part of wrist-watch - Google Patents

Abstract

PURPOSE:To prevent the penetration leakage in a gasket during long-time diving and that of a helium molecule into a case during deep-sea diving, by using an org. gasket comprising a synthetic resin in the outside and a metal gasket impervious to gas in the inside. CONSTITUTION:A plurality of gaskets 4, 5 are provided between a middle 1 and the back 2 engaged with the middle 1. The first outside gasket 4 is formed as one comprising an org. substance such as synthetic rubber or a synthetic resin and the second inside gasket 5 is constituted as a metal one impervious to gas. By this constitution, water-proofness of about 20-100kg/cm<2> is secured by the gasket 4 low in gasket coefficient in a high pressure side and showing self-seal action and, because the moisture or helium molecule penetrated into the gasket is high in gasket coefficient and low in pressure, penetration leakage can be perfectly suppressed by the gasket 5 capable of preventing contact sur face leakage of low contact surface pressure.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a high-pressure waterproofing device, and particularly to a high-pressure waterproofing device for small diving equipment such as diving watches used in scuba diving, saturation diving, etc.

[Summary of the invention]

The present invention further improves the long-term waterproofness and helium gas resistance of high-pressure waterproof devices for diving equipment such as diving watches used for scuba diving and saturation diving. In a configuration in which multiple gaskets are provided between two members, the outer gasket is made of an organic gasket, and the inner gasket is made of a metal gasket that does not allow gas to pass through, making it waterproof over a long period of time. This made it possible to create small diving equipment such as diving watches that are fully equipped with a high-pressure waterproof device that is highly durable and resistant to helium gas.

[Conventional technology]

Conventional high-pressure waterproofing equipment is configured with one or more gaskets, but for small items such as diving watches, it is not possible to completely prevent leakage in which water vapor, helium gas, etc. permeate through the entire inside of the gasket. Ta. This is because a metal gasket alone has a high gasket coefficient, which increases the contact pressure between the two parts that require high-pressure waterproofness at the level of 20 to 100 kg/d, making it unsuitable for small diving watches due to its strength. In addition, synthetic rubber and soft synthetic resin gaskets have a small gasket coefficient of 20 to 10, even if small, due to their self-sealing action.
This is due to the fact that although it is possible to obtain a high-pressure waterproof device at the Qkg/i level, the structure is not perfect in long-term waterproofing and helium gas resistance.

[Problems and Objectives to be Solved by the Invention] The present invention attempts to solve all of the major problems of conventional high-pressure waterproofing devices, such as long-term waterproofing and helium gas resistance. In addition to preventing leakage inside the gasket during diving, it also prevents helium gas molecules from leaking into the case during deep sea diving using helium mixed gas such as saturation diving, and prevents the internal pressure of the case from increasing.

[Means for solving problems]

The present invention consists of two parts: a body of a diving watch and a case back that is screwed into the body.
In a waterproofing system between parts, the first gasket is made of organic material such as synthetic rubber or synthetic resin on the side located on the outside of the case where external pressure is applied, and the first gasket is made of organic material such as synthetic rubber or synthetic resin, and the side located on the inside of the case is made of metal that does not allow gas permeation. The entire second gasket consists of:

With this configuration, the gasket coefficient is small on the high pressure side, and the first gasket with a self-sealing effect is 20
~100kq/CrIt2 level waterproofness, first gasket)? The permeated water and helium molecules have a large gasket coefficient but are at low pressure, so the second metal gasket can prevent leakage at the contact surface with a small contact pressure, making it possible to completely suppress permeation leakage. The tightness of the second gasket can be obtained with a small pressing force due to the low pressure, and it can be put to practical use in a small case.

〔Example〕

In Fig. 1, 1 is a body, and 2 is a screw-type cover, which, like the body 1, is made of a highly corrosion-resistant, high-strength metal material such as titanium or stainless steel. Reference numeral 4 designates a first gasket located on the outside, which is made of a synthetic rubber or synthetic resin organic material such as IIR or PTFE, which has a low gas permeability coefficient and water permeability, and is set in the gasket groove 1a of the body 1. A tightening allowance is provided in the axial direction by the screw-type back cover 2. Reference numeral 5 designates an inner second gasket, which is formed in the shape of a hollow thin metal pipe made of stainless steel or the like. Like the first gasket, it is set in the gasket groove 1b of the body 1, and is closed by the screw-type back cover 2. A tightening allowance is provided in the axial direction.

〔Effect of the invention〕

The present invention has been able to obtain extremely excellent long-term waterproofness and helium gas resistance with the above-mentioned configuration, and the first gasket 4 shown in FIG. In addition to preventing leakage, the second gasket 5 can prevent low-pressure level moisture and helium gas from leaking from the interface and penetrating the surface, providing not only short-term waterproofing but also long-term waterproofing and helium gas resistance. It is possible to obtain small diving equipment such as a diving watch that is extremely superior in terms of performance than ever before, and is a highly safe and reliable equipment that has a wide range of uses and has great practical effects.

[Brief explanation of drawings]

FIG. 1 is a partial vertical sectional view showing an embodiment of the present invention. 1...Body 2...Back cover 4...First gasket (organic) 5...
・Second gasket (metallic) or higher

Claims (1)

[Claims] In a waterproofing device in which a plurality of gaskets are constructed between two members of a case and a back cover that are threadedly engaged with the case, the first gasket located on the outside is composed of a gasket made of organic material such as synthetic rubber or synthetic resin, and the A high-pressure waterproofing device for a back cover, characterized in that a second gasket located thereon is made of a metal gasket that does not allow gas to pass through.