| 摘要 |
12 A blow-molded lid is provided for closing a cup which has a circular top edge and a rib projecting outwardly from the top edge. The lid includes an outwardly projecting bead which in axial section curves downwardly and inwardly to a radius smaller than the maximum radius of the rib. The bead thus defines aninwardly concave groove adapted to snap over the rib. The lid incorporates a strengthening configuration closely upwardly adjacent to the bead, the strengthening configuration including a step-like formation.
|
