Container cap with a liner retention structure
A cap for a container having a pair of side walls each with an inner wall surface. Each inner wall surface having a minimum of two pairs of ribs distributed thereon for retention of a liner. Each of the a minimum of two pairs of ribs has a concave arc with a concave radius of curvature forming a curved portion of the inner wall, and a convex arc. Each of the a minimum if two pairs of ribs has a different overall configuration that facilitates removal, and securing onto, of the cap from/to the container without damage of the ribs and the retention of the liner in the cap.
1. A cap comprising:
a. a cap body having a pair of curved side walls and an inner underside surface that are joined or connected together, each curved side wall extending around a center axis of the cap and having an outer wall surface and an inner wall surface, and
b. a liner retention system comprising
i. a first, second and third pairs of side wall ribs distributed on the inner wall surface, wherein a rib of each pair is positioned on each curved side wall and aligned latitudinally in the cap body, the first, second and third ribs on one side wall facing third, second and first ribs, respectively, on the other side wall, each rib having arcuate surfaces forming a curved structure on the inner wall surface and a curved surface in the latitudinal extant, the curvature helping to retain a liner in the cap, wherein each pair of ribs has a different configuration, and
ii. a pair of edge ribs positioned where the pair of curved side walls are joined or connected, and
iii. said cap body also comprising first and second pairs of locking tabs distributed on the inner wall surface for engaging with a respective flange on the container, wherein each tab of the first pair is aligned perpendicularly with an edge rib, and each tab of the second pair is aligned perpendicularly with a side wall rib.
2. The cap of claim 1 wherein each tab of the first pair of first locking tabs has a base and an end and forms a taper therebetween, and wherein the taper narrows the locking tab from the base that is closer to the inner wall surface to the end.
3. The cap of claim 1 additionally comprising the liner.