Cap

Claim 1

A cap structure for a container comprising an interior cap member having a top wall arranged to close the container when the cap is mounted thereon and having a peripheral wall carrying a screw thread on its inner surface arranged to provide releasable mounting of the interior cap member upon the container by relative rotational movement, said peripheral wall having on its outer surface a plurality of spaced ribs and grooves parallel to the axis of said rotational movement, and an exterior flexible resilient transparent cap member having a top wall and a peripheral wall overlying the top wall and peripheral wall respectively of said interior cap member, said exterior top wall being formed with a generally annular downwardly extending hollow rib of V-shaped cross-section in position to abut the top wall of the interior cap member and to form a closed compartment therewith when the caps are assembled, said outer peripheral wall having on its inner surface a plurality of spaced ribs and grooves interlocking with those on the peripheral wall of the interior cap, the exterior cap being a force fit on the interior cap, the interior and exterior caps being constructed and arranged so that one may be mounted on and removed from the other by movement parallel to the axis of rotation and so that the interior cap can be mounted on and Removed from the container by relative rotational movement without removing the exterior cap from the interior cap.