Internal pressure adjusting mechanism for underwater and waterpr

Details Internal pressure adjusting mechanism for underwater and waterpr Internal pressure adjusting mechanism for underwater and waterpr

1989-05-30

1990-06-05

Gellner, Michael L.

G03B 1708

Patent

active

049318160

ABSTRACT:
An internal pressure adjusting mechanism for equalizing the internal and external pressures of a waterproof product, such as an underwater camera, when the internal pressure of the product varies due to a change in temperature or atmospheric pressure. The internal pressure adjusting mechanism includes an air circulation passage in the product for establishing communication between the interior of the product and an external atmosphere, and a water-repellent porous member in the passage to permit air to freely circulate through the passage while preventing water from passing therethrough.

REFERENCES:
patent: 4771299 (1988-09-01), Gell, Jr.

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