DEPRESSURIZING PUMP ASSEMBLIES AND CLOSURES FOR BEVERAGE CONTAINER

摘要

An assembly 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.