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An assemlby for depressurizing an opened beverage bottle including a bottle closure having a valve to permit depressurization of the bottle by a removable pump assembly. The pump assembly includes a stretchable diaphragm having roller being moveable on tracks within a housing. A pivotal actuator str

An assemlby for depressurizing an opened beverage bottle including a bottle closure having a valve to permit depressurization of the bottle by a removable pump assembly. The pump assembly includes a stretchable diaphragm having roller being moveable on tracks within a housing. A pivotal actuator stretches the diaphragm to cause expansion of diaphragm chamber and effect depressurization of the bottle through the closure valve.

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1. A pump assembly for depressurizing a bottle having a neck comprisingclosure means for attachment to the neck of the bottle, said closure means having valve means for depressurizing the bottle and creating a seal after depressurizing the bottle, a hollow housing means for removable attachment to s

1. A pump assembly for depressurizing a bottle having a neck comprisingclosure means for attachment to the neck of the bottle, said closure means having valve means for depressurizing the bottle and creating a seal after depressurizing the bottle, a hollow housing means for removable attachment to said closure means upon being attached to the neck of the bottle, a stretchable diaphragm being mounted in said housing means and forming a expandable chamber above said closure means, and; said stretchable diaphragm having an outer periphery attached to said housing means, an actuator means being operatively connected to said diaphragm for stretching said diaphragm to expand said expandable chamber for depressurizing the bottle through said valve means of said closure means. 2. The pump assembly according to claim 1 wherein said housing means includes a hollow projection for creating a seal with the periphery of said closure means.3. The pump assembly according to claim 2 wherein said valve means includes a flexible port to permit air in the bottle to be exhausted as the diaphragm is stretched.4. The pump assembly according to claim 1 wherein said housing means includes a valve for exhausting air to the atmosphere from the expanding chamber.5. The pump assembly according to claim 4 wherein said stretchable diaphragm includes a continuous partial circular U-shaped section.6. The pump assembly according to claim 1 wherein actuator means includes a pump lever pivotally attached to a lever arm, said lever arm being attached to said diaphragm means for providing movement during stretching.7. The pump assembly according to claim 1 wherein said closure means includes a lower projection for insertion into the neck of the bottle in sealed relationship, and an upper portion for removable attachment of said housing means.8. The pump assembly according to claim 7 wherein said lower projection includes at least one ring to engage the neck of the bottle in sealing relationship.9. The pump assembly according to claim 1 wherein said housing means includes a pair of concentric cylindrical projections for attachment to said closure means.10. The pump assembly according to claim 9 wherein said closure means includes a upper circumferentially extending circular wall for being positioned between said pair of concentric projections during said attachment.11. The pump assembly according to claim 1 wherein said valve means makes hissing sound during depressurization of the bottle, said hissing sound stopping upon generally complete depressurization of the bottle.12. A pump assembly for depressurizing a bottle having a neck comprisingclosure means for attachment to the neck of the bottle, said closure means having valve means for depressurizing the bottle and creating a a seal after depressurizing the bottle, a hollow housing means for removable attachment to said closure means upon being attached to the neck of the bottle, a stretchable diaphragm being mounted in said housing means, an actuator means being operatively connected to said diaphragm for stretching said diaphragm to create an expanding chamber for depressurizing the bottle through said valve means of said closure means, and diaphragm rod means being attached to said diaphragm means and said actuator means, said diaphragm rod means having means for providing movement relative to housing, said housing having track means for receiving said means to provide movement. 13. The pump assembly according to claim 12 further including a spring affixed to said housing and said means for providing movement to remove slack from said diaphragm means while being stretched.14. The pump assembly according to claim 12 wherein said rod means is a rod having a lower end attached to said diaphragm and an upper end attached to said means for providing movement.15. A pump assembly for depressurizing a bottle having a neck comprisingclosure means for attachment to the neck of the bottle, said closure means having valve means for depressurizing the bottle and creating a seal after depressurizing the bottle, a hollow housing means for removable attachment to said closure means upon being attached to the neck of the bottle, a stretchable diaphragm being mounted in said housing means, an actuator means being operatively connected to said diaphragm for stretching said diaphragm to create an expanding chamber for depressurizing the bottle through said valve means of said closure means said housing means includes a valve for exhausting air to the atmosphere from the expanding chamber, said stretchable diaphragm includes a continuous circular U-shaped section, and said diaphragm includes a pair of inverted U-shaped sections adjacent to said rod means. 16. A pump assembly for depressurizing a bottle having a neck comprisingclosure means for attachment to the neck of the bottle, said closure means having valve means for depressurizing the bottle and creating a seal after depressurizing the bottle, a hollow housing means for removable attachment to said closure means upon being attached to the neck of the bottle, a stretchable diaphragm being mounted in said housing means, and; an actuator means being operatively connected to said diaphragm for stretching said diaphragm to create an expanding chamber for depressurizing the bottle through said valve means of said closure means, and said housing has a pair of interconnected halves, said halves having respective edges being in contact for forming said hollow housing, said respective edges having continuous offset lips contacting each other in side by side relationship.