| 摘要 |
Sealing is provided for sealing both of the water and sand for underwater camera housing so as to prevent the wear and abrasion of the packing and screw threads by the sand. A packing consisting of a main body, a flange and an intermediate bridge portion therebetween, all formed integrally, is used. Watertightness is achieved mainly by the main body which is fitted in an annular groove formed around the base of an externally threaded cylindrical portion of the casing encasing therein a camera and compressed by the end face of an inwardly extending, internally threaded cylindrical portion of a cover having an optical window. Watertightness and sandtightness are achieved by the flange portion of the packing which is interposed between the end faces of the flanges of the casing and cover.
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