| 摘要 |
<p>A sheet metal door frame (1) comprising a substantially U-shaped head piece (2), whose opposite ends (4, 5) are cut out to accommodate a likewise U-shaped pair of square-cut jambs (3). The side walls (10) of the head piece and jambs are provided at their free longitudinal ends (11) with outwardly bent flanges (12) for attachment of architraves (14). The invention relates specifically to that the head piece (2) is provided at its opposite ends (4, 5) with hook-shaped end portions (20) formed in the side walls (10) and arranged to overlap the end portions (21) of the corresponding side walls (10) of the jambs (3) and to engage the outwardly bent flanges (12) of the jambs (3). The hook-shaped end portions (20) are more particularly arranged to engage substantially horizontal edge surfaces (23) of said flanges (12).</p> |
