Patent ID: 8919618

Claim:
A self chilling beverage container including a heat exchange unit therein having an over pressure relief valve therein comprising: (A) a container for receiving a beverage and having a bottom defining an opening therethrough; (B) a heat exchange unit having compacted carbon therein for adsorbing pressurized carbon dioxide gas; (C) a valve cup secured to said heat exchange unit and to said opening in the bottom of said container to dispose said heat exchange unit in contact with the beverage; (D) a valve mechanism secured to said valve cup and extending into said heat exchange unit, said valve mechanism including (1) a hollow valve having a hollow cylindrical housing having an inner wall, a top surface defining a plurality of castellations, and a lower open end; (2) a separate housing base closing said lower open end of said housing and defining an opening therethrough and including an outwardly extending flange which defines a shoulder, the lower end of said housing engaging said shoulder, said housing base further defines a groove surrounding said opening therethrough; (3) a first valve having a hollow valve stem disposed within said hollow cylindrical housing and having an outer wall and an actuator rod defining a plurality of transverse openings therein and an elongated opening communicating directly with the atmosphere through which said pressurized carbon dioxide gas flows and a valve stem base defining an orifice therethrough; (4) a first spring disposed within said hollow valve stem; (5) a pressure relief sealing plug seated over the orifice in said valve stem base; (6) said first spring being seated between said pressure relief sealing plug and a surface of said hollow interior of said valve stem biasing said pressure relief sealing plug toward said orifice in said valve stem base to close said orifice in said valve stem base; (7) said orifice in said valve stem base being continuously exposed to said pressurized carbon dioxide gas in said heat exchange unit; and (8) a second spring in series with said first spring seated within said groove in said cylindrical housing base and engaging said valve stem base urging said first valve upwardly to close said first valve.