| 摘要 |
<p>The door case is delivered to site as a rectangular frame, comprising a bar with hinges and a bar with openings for the bolt, and two cross pieces connected with these; either of the latter can be at the bottom, and the bottom door stop is removable. At abutments with bars the cross pieces have detachable screw or plug connections, and at an interval from these they are rigidly joined by a profiled auxiliary plate. The profiled end piece (17) of this plate (15) has flaps (23) punched on one side and cut on both sides, forming a fracture point (22), for fixing the plate to a bar via welded studs (24). This obviates the need for welding seams.</p> |
