Abstract: A revolving door assembly includes a pair of part-cylindrical wall portions partly surrounding the rotational path of a revolving door and partly defining a passage. Pairs of part-cylindrical wall panels are provided in association with the part-cylindrical wall portions, such wall panels being movable along paths concentric with the rotational path of the revolving door and being adapted to close and open the passage substantially in syncronism with the continuous rotation of the revolving door. Thereby passage will remain checked during such rotation, alternatingly by the revolving door alone and by the door in cooperation with the wall panels of each pair, whereby a draft-free passage will be maintained.

Abstract: The invention comprises a unit (1) implemented with two elongate chambers (3, 4) provided with openings or gaps (7, 8) on one wall (5, 6). At one end of one chamber one or more LED (9) are adapted, and opposite hereto at the end of the other chamber there is arranged a receiving means (10). After one or more reflections by the reflecting walls of the first chamber (3) the radiation departs through the opening or gap (7) and after reflection by an object (13) on the outside returns through the gap (8) of the other chamber (4), to be reflected by the mirror walls of the chamber such as to strike the receiving means (10) after reflection.

Abstract: A hydraulic door opener comprising a closed hydraulic circuit including a motor for actuating a door operating spring surrounded by a housing which forms a component part of the hydraulic circuit and serves as a reservoir for the hydraulic liquid.