Plug-type bottle closure (plastic cork)
OwnerRolf D. Korte, Wilfried Rohljeinventors
Life of this patent
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Abstract
A plug-type closure for a bottle, e.g. a wine bottle "cork" consists of a unitary circular cross section plug having a thin-wall core spacedly surrounded by the outer member and a plurality of radial webs bridging the outer member core. The core is formed with a corkscrew-shaped cavity including a screw-shaped groove whose depth and radius decreases progressively toward the bottom of the plug.
Claims5
A plastic bottle cork comprising a unitary elongated body of synthetic-resin material formed with a hollow cylindrical outer member, a closed bottom, an axially extending core member connected to said bottom, and a plurality of angularly spaced radial walls bridging said members, said core member being formed with an elongated cavity closed in the region of said bottom and opened at the opposite end of said body, said cavity being formed with a passage conically tapering from said end toward said bottom, and a helical groove formed in the wall of said passage and having outwardly convergent flanks, the radius of said groove and the groove opening progressively diminishing from said end toward said bottom.
Dependencies are inferred from the claim text.