Easy-open, tamper-indicating closure

Claim 1

A tamper-indicating press-on, pull-off closure for maintaining pressure in a container, said container including a neck portion with a sealing bead thereon and an open mouth at the upper extremity thereof, said closure comprising: a plastic inner cap having a top wall spanning the open mouth of said container and a depending circumferential skirt surrounding and engaging the neck portion of said container; a ring pull member formed integral with said inner cap, said ring pull being connected to and depending downwardly from the lower free edge of the circumferential skirt of said inner cap by means of a hinge and at least one severable, tamper-indicating web which severs upon actuation of said ring pull member to remove said inner cap from engagement with said container neck; an outer metal cap adapted to snugly fit over said inner cap and having a top wall overlying the top wall of said inner cap and spanning the open mouth of said container and a depending circumferential skirt surrounding the depending circumferential skirt of said inner cap and being crimped into holding engagement with the sealing band on said container neck to thereby retain said inner and outer caps in sealing engagement with said container neck to maintain pressure within said container, and said outer cap including at least one score in its skirt which fractures upon actuation of the ring pull member to thereby release the outer cap from engagement with the container neck.