JOINING OF SIDE-PLATES AT A METAL DOOR

摘要

A metal door construction comprises two sheet-metal panels (10, 11) which form the flat sides of the door. The metal panels present folded side-edge portions (10a-10g; 11a-11e) which extend parallel to and in contact with one another within a joint region (10f; 11e). The one panel is provided with a double fold (10c, 10e) which forms a pocket which is intended to receive the straight end-edge part (11f) of the other panel (11). The other panel (11) is provided with an outwardly folded profiled part, in the form of a bead or like promontory (11b), on the other side of the joint region. The metal door may be provided with a mullion structure for cooperation with a similar metal door (3) in a manner to form a double door construction hung in one and the same door frame. The mullion structure includes a plate (4) which covers a hooked latching bolt used to hold the two doors together and to prevent the door crack from increasing to a non-permitted extent in the event of fire.