Safety closure with liner
AssigneeOwens-Illinois, Inc.
InventorRobert C. DeWallace
Life of this patent
Estimating the term…
Abstract
A safety closure comprises a cap having a pair of locking lugs which engage complimentarily disposed camming surfaces on the associated container and a plug or valve style liner disposed within the cap. The liner includes a generally planar disk having a hollow cylindrical plug defining an outer surface having a compound taper and a conical projection spaced concentrically about said cylindrical plug. The liner extends into the finish of the container and seals it during axial translation of the closure corresponding to 180.degree. or less rotation thereof. The liner, due to its simplicity, may be fabricated of material which exhibits resistance to the product within the container but which would otherwise be unsuitable or difficult to mold into the cap.
Claims7
A closure for a container having a neck including a radial annular rim surface defining the container opening, comprising, in combination, a closure body having a top panel and a sidewall depending therefrom, said sidewall having means for securing said closure body to the neck of said container and a circumferential retainer rib defining a retaining channel adjacent said top panel, a liner disposed within said retaining channel, said liner including a planar circular disk and a depending plug defined by a cylindrical wall normal to the underside of said disk and coaxial with the center axis of said disk for sealing engagement with said neck below the opening of said container, said cylindrical wall having a straight inner surface and a compound tapered outer surface, the first tapered region of said outer surface adjacent said disk being of a diameter to fit and seal inside the neck opening of the container below said rim and the lower tapered region being a frusto-conical surface smaller than the opening of the container, and an annular V-shaped rib depending from the underside of said disk concentrically about said cylindrical wall and located for sealing engagement on said rim surface of the container neck.
A closure for a container having a neck including a radial annular rim surface at the end opening thereof, comprising, in combination, a closure body molded of a first material and having a top panel and a sidewall extending therefrom, said sidewall having an inner surface including thread means for securing said closure body to such container and an inwardly directed circumferential rib spaced below said top panel defining a retaining channel, and a liner retained in said retaining channel, said liner being molded of a second plastic material comprised of a plastic and distinct from said first material and including a planar disk and a downwardly depending cylindrical wall concentric about the center axis of said disk, said cylindrical wall including a first outer surface region adjacent said planar disk disposed substantially parallel to said center axis and a second outer surface region of frusto-conical contour disposed below said first region and having an angle of taper of approximately 15.degree. toward said center axis, the axial length of said cylindrical wall being greater than one-half the lead dimension of said thread means, and a circular V-shaped rib disposed on the underside of said disk concentrically about said cylindrical walls, whereby the V-shaped rib is located for sealingly engaging the radial rim surface of the neck.
Dependencies are inferred from the claim text.