| 摘要 |
An obturator for an aperture (8) produced in a metal sheet (9) has a central dome (1), a peripheral lip (3) and an annular part (3) extending between the dome (1) and the lip (2). The annular part (3) has a shoulder (4). The dome (1) is adapted to deform between a starting position and a locking position of the obturator in which the dome (1) is turned inside out in relation to the starting position. The annular part is adapted to expand between the starting position and locking position and is maintained expanded by the inverted dome (1) in the locking position. The lip (2) is adapted to come into abutment against a face (9a) of the aperture (8) and the shoulder (4) is adapted to be in abutment against an opposite face (9b) of the aperture (8) in the locking position.
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