Patent ID: 8801315

Claim:
An airtight-sealing cap comprising: a helical spring; an inner cap, said inner cap comprising a first end and a second end, with said first end being open, and said first end comprising an annular convex surface; a shaft, said shaft having a first end fixedly secured to said second end of said inner cap, and said shaft extending therefrom to a second end, said helical spring being slidably received upon said shaft; an outer cap, said outer cap comprising an outer cap member and a cap support member, said cap support member having a first end and a second end, and an interior surface and an exterior surface defining a wall, with said first end being open to said interior surface, said interior surface of said cap support member at said first end comprising an annular lip; said inner cap being received in said open first end of said cap support member, with said shaft being slidably received within an orifice in said wall of said cap support member, said shaft comprising a stop at said second end of said shaft, said helical spring configured to bias said inner cap to travel toward said open first end of said cap support member, said biased travel being limited by said stop of said shaft contacting said wall, said outer cap member having a first end and a second end, said first end of said outer cap member having an opening defining an interior configured to receive said cap support member, said cap support member being fixedly secured to said outer cap member.