Prefabricated door case and wing hung either way - with interlocking recess and cut=out fittings in vertical parts

摘要

There are recesses in both upright bars of the door case frame, to accommodate a closing plate, and cutouts in the wing, open to both vertical sides, to accommodate a lock. Form pieces fitted with anchoring units, are firmly set in the recess and cutout on the strip side, so that these units interlock with each other when the door is closed. Triangular anchoring protrusions, and housing chambers, are used. The design affords simple assembly on site, and provides security against break-in by simple structural means.