| 摘要 |
An improved threadedly engageable container closure having a frangibly interconnected tamper-indicating ring, in which the tamper-indicating ring includes a relatively thin upper portion and a relatively thicker lower portion defining a circular recess of rectangular configuration. The tabs are interconnected to an inner upper edge of the lower portion of the tamper-indicating ring by an area of cross section sufficiently thin as to impart elastic memory between the lower portion of the tamper-indicating ring and the upper portion. When the closure is installed, the tabs pivot to operative position, and remain so as the closure is installed, the relatively thinner upper portion of the ring expanding uniformly through contact of the outwardly-directed surfaces of the tab against the inner surface of the upper portion of the closure ring.
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