| 摘要 |
Abstract A door (10) for closing an access opening 13 in a sheet metal wall (12) comprises a single sheet of metal having a panel portion (20) and a second portion (200). The second portion comprises three vertical strips (22, 25 and 26) of sheet metal formed by three vertical folds of the single metal sheet. The first fold - through a right angle - is at the vertical junction of the panel portion (20) and the second portion (200). The second and third folds are in the second portion (200). The metal strip between the first and second folds is a planar edge strip (22) of the door. The metal strip between the second and third folds is a planar, vertical second strip (25), the plane of which is orthogonal to the plane of the edge strip (22). The metal strip between the third fold and the outer edge (201) of the second portion (200) is a generally planar, vertical third strip (26), the plane of which makes an acute angle with the plane of the second strip (25). The door (10) is mounted on the wall (12) using offset axis hinges (11). A flange (30) extends from the edge of the access opening (13) that is adjacent to the hinges (11). A lip (31) at the end of the flange (30) is positioned between the second strip (25) and the third strip (26) when the door is closed. Added security for the door is provided by dog bolts (28), the threaded part of which is screwed into threaded apertures (27) in the edge strip (22), so that, when the door is closed, the non threaded ends of the dog bolts enter correspondingly located apertures (35) in the flange (30). ) C. |
