Abstract: A pivoted window frame is disclosed having an outer fixed frame and an inner pivotable frame together with a pivotable channel guide for a blind. An actuating mechanism on the movable frame can act to lock the movable frame in a closed position in the outer frame together with the channel guide or to release the movable frame for movement with or without the channel guide. The drive mechanism also actuates means for determining any one a plurality of pivoted positions of the movable frame and a sealing mechanism for urging resilient sealing lips into contact with the movable frame only when it is in its closed position.