Double-glazed window unit - uses frame switch to pump darkening fluid between panes and for its return

摘要

A pump (PUMPE) can be actuated by a switch (SCHALTER) on a window frame (FENSTER RAHMEN). It may be used to pump dark fluid from a container between the two panes of a double-glazed (GLAS) window and thus into the interval (ZWISCHENRAUM) between them so as to darken the room within. The switch typically has three positions, notably for pumping fluid in, stopping it off and returning the fluid. The fluid leaves no trace behind on the window glass.