Insulated porthole, for ocean-going vessels, is a double glazing with a thicker outer disk pane of a larger diameter in the frame in a force fit with a smaller floating disk pane

摘要

The insulated porthole, for an ocean-going vessel, has a double glazing (S) with disk panes of different diameters. The outer and thicker disk (S1) is at the frame (A) in a force fit and the inner disk (S2) floats. The two disk panes are not pressed together by water pressure. The inner frame can be heated.