Patent ID: 7118298

Claim:
A container comprising a container body having a neck, and a cap adapted to be detachably mounted on said neck of said container body, said neck comprising a tapered upper portion having a top end and a bottom end, and a small-diameter mid-portion joined to said bottom end of said tapered upper portion to define a shoulder on the bottom end thereof, said cap comprising a cap body in which said neck can be received, a plug vertically movably supported in said cap body for closing the opening of said neck, an elastic member supported in said container body under said plug, said elastic member being slidable along the outer surface of said tapered upper portion and adapted to engage said shoulder when received in said small-diameter portion, a biasing member mounted in said cap body to bias said plug downwardly relative to said cap body, and a disengaging member mounted in said cap body for disengaging said elastic member from said shoulder, wherein said elastic member is made of an elastic material and has an inner periphery defined by a major axis and a minor axis, said major axis being longer than a maximum diameter of said tapered portion when said elastic member is not stressed, said minor axis being shorter than the maximum diameter of said tapered portion and longer than a minimum diameter of said tapered portion when said elastic member is not stressed, said elastic member being compressible in the major axis direction until the minor axis of said elastic member becomes greater than the maximum diameter of said tapered portion.