Pressurizing closure device

Claim 1

A pressurizing closure device for closing the opening in a container that contains a carbonated liquid or the like comprising in combination: a body member having an integral wall portion that fits over the opening in a container and seals the opening, said wall portion has a check valve port that passes air in a first direction through said wall portion to the internal volume of the container and opposes the passage of air in the reverse direction and out of the container, said check valve port comprises a conical shaped projection in outer configuration having a centered air passage passing therethrough for passing the air through said wall portion, said body member has an integral air cavity that communicates with said check valve port and that has an opening to the atmosphere, which air cavity is resiliently expandible and contractible to admit air through said opening and to compress air therein by covering said opening and contracting the cavity thereby pumping the air through said valve ports, and said conical shaped projection being of resilient material that is normally biased to close off said passage and being capable of projecting into a container whereby the pressurized air that can be injected into the container by said body member exerts pressure against the outer walls of the conical wall portion compressing the conical wall portion to close off said passage.