| 摘要 |
A panel includes a sheet of metal folded to define an elongate main panel portion (100, 200) along the edges of which are a first longitudinal side flange (101, 201) and a first transverse end flange (103, 203). The first longitudinal side flange is along at least part of its length folded back towards the main panel portion (100, 200) and secured thereto to provide a tubular edge reinforcement of the panel. The first longitudinal side flange (101, 201) has a first longitudinal end which is secured to the first transverse end flange (103, 203). A portion (107) of the first longitudinal side flange (101) generally parallel to the main panel portion (100) has a longitudinal extension (115) which is folded towards the main panel portion (100) and is secured to a portion of the first transverse end flange (103) extending away from the main panel portion (100). |
