PROTECTIVE DEVICE FOR WALL OPENING Russian patent published in 2005 - IPC

FIELD: building, particularly safety closing devices for openings.

SUBSTANCE: protective device comprises metal rectangular frame and at least one flap installed in frame and rotating around vertical axis. Frame is formed of composite profile made as parts of channel bar surfaces and profile having opened section, which are fixedly connected in contact areas. Profile with opened section includes double-step part comprising the first and the second parallel steps. The first step edges are joined one to another along the full length thereof by riser part located perpendicular to steps. The second edges of the first and the second stages are connected correspondingly to the first and the second linear parts extending perpendicular to them and having bends facing each other. Bends are located in plane parallel to the first and the second stage planes. The first stage is joined to the first linear part. The first linear part width is less than that of the second one by riser part height value. Flanges of channel bar secured to wall are located inside profile with opened section and fixedly connected to edges of corresponding bends formed on profile with opened section. Flap is made as metal sheet framed with profiles having opened section along the full perimeter thereof, wherein above profile shape and size correspond to that of profile with opened section of composite profile. Outer and inner surfaces of metal sheet contact with inner edge of one bend and outer edge of another bend and fixedly connected to them at least along one contact outline defined by surface parts thereof. Flap is installed in frame so that in flap closed position the first stage and riser part are located opposite to the first stage and the first linear part of corresponding frame profile having opened section.

EFFECT: improved performance.

7 cl, 4 dwg