Combination metal door and door frame unit

Claim 1

IN A COMBINATION METAL DOOR AND DOOR FRAME UNIT INSTALLABLE IN AN OPENING OF A WALL, WHEREIN SAID DOOR FRAME INCLUDES A PAIR OF INTEGRAL DOOR POSTS OF SUBSTANTIALLY SIMILAR AND UNIFORM CROSS-SECTION THROUGHOUT THEIR LENGTH, SAID DOOR HAVING INTEGRAL STILES OF SUBSTANTIALLY SIMILAR AND UNIFORM CROSS-SECTION THROUGHOUT THEIR LENGTH AND BEING DIMENSIONED TO FIT SAID DOOR FRAME WITH EACH OF ITS STILES ADJACENT TO A DOOR POST OF THE DOORWAY, THE COMBINATION CONSISTING OF: A PAIR OF FLANGES INCLUDED IN THE CONSTRUCTION OF EACH SAID DOOR POST, SAID FLANGES BEING ANGULARLY RELATED TO EACH OTHER AND DIMENSIONED AND CONTOURED TO SERVE RESPECTIVELY AS A JAMB FLANGE AGAINST WHICH THE DOOR CLOSES AND AS A SURFACE FLANGE FOR THE WALL ADJACENT SAID OPENING; A CORNER MERGING SAID FLANGES ON EACH SAID DOOR POST; A BEAD ON THE SURFACE FLANGE OF EACH SAID DOOR POST; A LEDGE ADJACENT TO THE CORNER OF EACH SAID DOOR POST OF THE SURFACE FLANGE THEREOF, SAID LEDGE BEING DISPOSED BETWEEN SAID CORNER AND SAID BEAD; MEANS FOR HINGEDLY HANGING SAID DOOR BY ONE OF ITS SAID STILES ON THE DOOR POST ADJACENT THERETO FOR MOVEMENT THEREON BETWEEN AN OPEN POSITION RELATIVE TO SAID DOOR FRAME AND A CLOSED POSITION IN WHICH SAID DOOR IS CENTERED BETWEEN SAID DOORPOSTS, SAID MEANS INCLUDING SAID BEAD ON SAID DOOR POST, AND A FIN ON EACH SAID STILE, EACH SAID FIN BEING DIMENSIONED TO OVERLAP AND ENGAGE SUBSTANTIALLY THE WHOLE OF THE LEDGE ON THE ADJACENT DOOR POST WHEN THE DOOR IS IN ITS SAID CLOSED POSITION BUT TO CLEAR THE BEAD ON SAID ADJACENT DOOR POST WHEN THE DOOR IS MOVED BETWEEN ITS OPEN AND CLOSED POSITIONS AS AFORESAID.