| 摘要 |
<p>Door with a metal frame and wooden filler panels, specially for stables, is made of a C-shaped metal profile for the frame which has on the outsides of the C-shape two stepped recesses for the door panels, and a flange on the opposite side at one end. The frame is assembled by fitting L-shaped joining angles over dimples in the corners or by bolting them. The assembly takes place on a work table and the entire inside cavity is filled out with a plastic foam. This reduces the time and labour required considerably and lowers the cost of mfr.</p> |
