| 摘要 |
A stay-on opening tab has a nose portion extending from one side of an attaching rivet and a lifting lever extending from the opposite side of the rivet. The lifting end of the tab is contoured in a simple or compound curve at the lifting end, creating a concave fingertip entry gap at the lifting end. The concavity may be a simple U-shape or it may be additionally arched. The tab may be longitudinally arched for substantially its entire longitudinal dimension, thereby also providing shape strengthening for improved beam strength. Where the nose is arched, the tab operates with smoothly guided pivotal action.
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