Load bearing door frames

Claim 1

AN INSTALLATION FOR DOORWAYS BETWEEN PRE-ERECTED STUDDING AND UNDERPLATE MEMBERS OF THE INTERIOR WALL BEARING FRAME, COMPRISING, A METAL DOOR FRAME ASSEMBLY HAVING VERTICAL JAMBS AND A HEAD FIXED THERETO, SAID JAMBS AND HEAD BOTH HAVING A WEB AND OUTWARDLY EXTENDING FLANGES PROVIDING OUTWARDLY FACING VERTICAL CHANNEL PORTIONS, AN ADJUSTABLE LOAD BEARING HEADER ABOVE SAID HEAD, MEANS FOR EFFECTING ADJUSTMENT OF SAID LOAD BEARING HEADER RELATIVE TO THE HEAD OF THE METAL DOOR FRAME, SAID MEANS INCLUDING, BRACKETS CONNECTED WITH THE WEBS OF SAID JAMBS ADJACENT THE UPPER ENDS THEREOF AND HAVING A DOWNWARDLY TURNED FLANGE AND AN OPENING INWARDLY OF SAID FLANGE, THE WEB OF SAID HEAD HAVING EXTENSIONS AT EACH END THEREOF, EACH OF SAID EXTENSIONS TERMINATING IN A DOWNWARDLY TURNED FLANGE WHICH OVERLIES THE RELATED FLANGE OF SAID BRACKET WHEN THE HEAD IS ASSEMBLED WITH THE JAMBS, SAID EXTENSIONS ALSO HAVING AN OPENING INWARDLY OF SAID FLANGE, THE RELATED OPENINGS OF SAID BRACKETS AND EXTENSIONS BEING IN REGISTRY WHEN SAID MEMBERS ARE IN ASSEMBLED POSITION, A NUT FIXED TO THE LOWER SURFACE OF EACH OF SAID BRACKETS BENEATH THE OPENINGS THEREIN, A HEADED BOLT THREADEDLY ENGAGED WITH EACH OF SAID FIXED NUTS AND EXTENDING ABOVE THE PLANE OF SAID EXTENSIONS,