| 摘要 |
<p>The bottle cap comprises a cylindrical outer section closed at the top and a cylindrical inner section rotating in it. The outer section (1) has internal ribs (3) running in the axial direction, and the dia. of the inner one (4) is less than the clear dia. of the outer one. It has on the outside axial ribs (6) extending to shortly before those inside the outer one, which is of elastic material, with a protrusion (10) at the bottom on the inside engaging under the edge of the inner one. On the outside of the outer section there can be markings (7, 8) near its ribs. The protrusion can be an internal peripheral bead.</p> |
