| 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) having 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 said starting position, and the annular part is adapted to expand between said starting position and said locking position and to be kept expanded by said dome (1) turned inside out in the locking position, the lip (2) being adapted to come into abutment against a face (9a) of the aperture (8) and the shoulder (4) being adapted to be in abutment against an opposite face (9b) of the aperture (8) in the locking position. <IMAGE> |
