(57) A security door comprises major and minor sheet metal trays (1 and 18) respectively
having panels (2 and 19) and standing walls (3,4 and 20). The walls (3,4) have marginal
portions (5,6) inturned from the walls (3,4) and overlying the panel (2) and terminal
re-entrant portions (7,8) turned from the portions (5,6) towards the panel (2). Elongate
frame members (10,11) are disposed within the tray (1) alongside the walls (3,4) and
have slots (15) receiving the portions (7,8) and walls (20). The frame members (10,11)
have bevelled edges (13,14) permitting the members (10,11) to be applied laterally
into the tray (1) so as to interengage with the walls (3,4) and portions (7,8).
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