(57) Armour-clad, bullet-proof closure means such as a door, window, window-glass and
the like ("closure means") integrally made from a small set of extruded structural
shapes (1,2,7,9) of aluminum alloy, of substantially quadrangolar and hollow shape,
arranged relatively to each other so to form two frames opposite to each other, joint-coupled
with each other by means of blocks or continuous bars (4,4a,8,8a) suitable to be inserted
inside seats provided on the mating faces of the said frames and so dimensioned, as
to form both the frame constituting the door or window jamb, and the glass-holding
frame of a door or window of the leaf type or fixed, the structural shapes (1,7) forming
the frame destined to remain inside the room being made of an aluminum alloy of the
traditional type for aluminium door and window jambs and frames, whilst the structural
shapes (2,9) forming the frame destined to remain outside the room are made of an
aluminum alloy endowed with a very high mechanical strength and high toughness.
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