| 摘要 |
A device for closure of an opening (3) surrounded by at least one wall section (4), said device comprising a covering element (8) arranged to substantially uncover the opening (3) in a first state of the device and to bear on to the wall sections (4) which surround said opening (3) in a substantially gastight closing manner in a second state of the device, whereby the covering element (8) is arranged to define a third state of the device, in which state the covering device (8) is arranged to substantially cover the opening (3) when there is no bearing or, in comparison to the second state, a weaker bearing against the wall sections (4) surrounding the opening (3), and the device comprises members (7) which are movable between a first position, in which they are arranged to permit the covering element (8) to define the third state in the covering position, and a second position, in which they are arranged to keep the device in the second state. |
