| 摘要 |
<p>A closure device, which may serve as a bottle closure (Figure 7) or as a sink plug, or may constitute a container such as for an air-freshener material, comprises a base (25) and a lid (28) formed by a resiliently deformable disc centrally resiliently mounted on a bridge (12) spanning the base and capable of flexing reversibly between two stable dished conditions, respectively an externally convex closed form and an externally concave open form.</p> |
