Sectional metal door frames

Claim 1

A METAL FRAME STRUCTURE FOR A DOOR OR THE LIKE COMPRISING, A PLURALITY OF HOLLOW ONE-PIECE SHEET METAL FRAME SECTIONS HAVING AN OPEN SIDE AND ADAPTED TO BE ANCHORED TO AN ADJACENT STRUCTURE, EACH OF SAID SECTIONS BEING GENERALLY CHANNEL-SHAPED IN CROSS SECTION, SAID SECTION HAVING OPPOSED YIELDABLE SIDE WALLS, A PAIR OF INTURNED LIPS PROJECTING FROM SAID SIDEWALLS TOWARD ONE ANOTHER AND DELINEATING SAID OPEN SIDE, AN ANCHORAGE DEVICE POSITIONED WITHIN SAID HOLLOW CHANNEL-SHAPED SHEET METAL FRAME SECTION, SAID ANCHORAGE DEVICE COMPRISING AN ANCHOR PLATE FORMED OF SHEET METAL AND BEING OF ONE-PIECE CONSTRUCTION, SAID ANCHOR PLATE BEING CONFIGURATED TO FIT WITHIN THE HOLLOW FRAME SECTION, A RESPECTIVE WEDGING FLANGE PROJECTING FROM THE OPPOSITE ENDS OF SAID ANCHOR PLATE SUBSTANTIALLY AT RIGHT ANGLES TO THE PLANE OF THE PLATE, SAID FLANGES EXTENDING RESPECTIVELY IN OPPOSITE DIRECTIONS WITH RESPECT TO THE PLANE OF THE PLATE, AND ATTACHMENT MEANS ON SAID ANCHOR PLATE PROJECTING OUTWARDLY FROM THE OPEN SIDE OF THE FRAME SECTION BETWEEN SAID INTURNED LIPS AND SPACED THEREFROM, SAID ATTACHMENT MEANS ADAPTED TO ANCHOR THE FRAME SECTION TO AN ADJACENT STRUCTURE, SAID ANCHOR PLATE INSERTED WITHIN THE HOLLOW FRAME SECTION IN A TRANSVERSELY CANTED POSITION RELATIVE TO THE LONGITUDINAL AXIS OF THE FRAME SECTION TO PROVIDE CLEARANCE BETWEEN THE SAID WEDGING FLANGES AND THE OPPOSED YIELDABLE SIDE WALLS OF THE SHEET METAL FRAME SECTION, SAID PLATE TURNED FROM THE CANTED POSITION TO A GENERALLY RIGHT ANGULAR POSITION RELATIVE TO THE AXIS OF THE FRAME SECTION, WHEREBY THE OPPOSITE ENDS OF THE ANCHOR PLATE ARE BROUGHT INTO ENGAGEMENT WITH SAID YIELDABLE SIDE WALLS TO SPRING THE SAME APART FROM ONE ANOTHER, SAID WEDGING FLANGES SEATING AGAINST THE YIELDABLE SIDE WALLS THEREBY TO LOCATE THE ANCHOR PLATE IN A POSITION SUBSTANTIALLY AT RIGHT ANGLES TO THE LONGITUDINAL AXIS OF THE FRAME SECTION AND SHIFTING THE WEDGING FLANGES INTO FRICTIONAL ENGAGEMENT WITH THE SIDE WALLS WITH SAID INTURNED LIPS OVERLYING THE ANCHOR PLATE AND CONFINING THE SAME WITHIN THE FRAME SECTION AT A SELECTED POSITION ALONG THE FRAME SECTION.