| 摘要 |
The closure cap herein described has a generally cylindrical skirt with a circular lowermost edge. Corrugations in the form of axial ridges and flutes terminate downwardly in a plane spaced from the edge. The crests of the ridges and the cylindrical lip are elements of a common cylinder. When the cap skirt is uniformly constricted about threads of a bottle finish, material along the lines of the flutes forms female thread elements, securing the cap to the bottle. The ridges, the thread elements and the lip constitute a knurling grid which affords a comfortable, sure finger grip for twisting the cap off the bottle, with the smooth lip surface shielding the edge.
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