| 摘要 |
An inserted lid (1) for a box (2) is formed so that a contact region (5) can be pressed against the inside of the side wall of the box. In the non-inserted state, said side wall is slightly larger than the box opening (4). on insertion of the lid (1) into the box (2), the largest circumferential line of the contact region (5) must fit the inside of the side wall of the box as a result of an elastic deformation of the closure surface (3). To prevent the forces emanating on insertion from the side wall of the box from leading to irreversible deformations, the closure surface (3) has spring properties which are radial with respect to the contact region (5) and permit an elastic deformation of the contact region (5) in the radial direction. To ensure these spring properties, the closure surface (3) has a shape differing from a flat surface, in particular two concentric waves (7) formed constant distances away from the contact region (5) and/or a central vault (8). On insertion of the lid (1), this difference is slightly increased by the compression of the contact region (5), or the waves (7) and the vault (8) are slightly deformed, which leads to storing forces which press the contact region (5) against the inside of the side wall of the box. Owing to the shape imposed on the closuresurface (3) , it is ensured that no creases or other irreversible deformations form on insertion of the lid (1) .
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