METAL DOOR Russian patent published in 2004 - IPC

FIELD: building, particularly metal doors.

SUBSTANCE: metal door includes case, door leaf welded to case and hinge connection to secure thereof with door opening. Door leaf includes three sheets welded one to another. Intermediate sheet has depression arranged along door vertical line and forming windows. Windows are closed with inner flanges of channel members from intermediate sheet top and bottom. Channel members create door case. Edges of channel members are connected to inner edges of upper and lower sheets with forming L-shaped connection area along depression width and T-shaped connection area along joints between sheets located outside depression. Crimped area is formed along full door leaf length. Crimped area is fixedly connected with ends of horizontal channel members. Another ends of these horizontal members are connected with ends of vertical channel member. Crimped area of door leaf is secured with inner surface thereof by angle member joined by its ends with flanges of horizontal channel members.

EFFECT: increased door leaf manufacturability and rigidity.

2 cl, 8 dwg