Selectively interlocked double security doors

Personal security door arrangement, characterised in that there is disposed in a fixed door frame a conventional inner door juxtaposed to an outer protective door affording complete visibility therethrough and allowing the passage of small objects, said doors being hingedly mounted to the door frame at the same side, rotating in the same direction and each having its own lock and having:

• (a) mutual coupling means for the two doors, with actuating means for the outer door from the inner door, interlockable by hand and automatically releasable on closing the door, which means, after the inner door has been opened to permit observation and has been of necessity closed again, are actuated voluntarily, thereby opening and retaining the outer door lock and opening both doors together;
• (b) interlocking means for the coupling means mounted in the inner door;
• (c) retaining means holding both doors coupled together in the open position;
• (d) releasing means automatically disengaging both doors on their being closed;
• and
• (e) an outer door blocking means, blocking the bolts thereof when the inner door is open.