초록 ▼

A hand-operated vacuum pump is combined with a resilient closure sleeve for sealing and de-pressurizing the open space within a fermented beverage container. A pump cylinder is covered by a resilient closure sleeve which is insertable into the neck of the beverage container. A piston is coupled for

A hand-operated vacuum pump is combined with a resilient closure sleeve for sealing and de-pressurizing the open space within a fermented beverage container. A pump cylinder is covered by a resilient closure sleeve which is insertable into the neck of the beverage container. A piston is coupled for extension and retraction through the pump cylinder. The piston carries a floating seal which is axially movable along a reduced diameter portion of the piston for opening and closing an air inlet port between an air transfer annulus and an evacuation chamber. The pump includes an improved check valve assembly in which a suction port is sealed by a resilient membrane which engages a tapered sealing surface in which the suction port is formed.

대표청구항 ▼

A pump and closure assembly for depressurizing the interior open space within a beverage container comprising: a closure member; a pump having a housing attached to said closure member, said pump housing having a cylindrical bore and a piston mounted for extension and retraction through said bore; a

A pump and closure assembly for depressurizing the interior open space within a beverage container comprising: a closure member; a pump having a housing attached to said closure member, said pump housing having a cylindrical bore and a piston mounted for extension and retraction through said bore; an annular seal mounted on said piston, said annular seal engaging said bore and defining the boundary of an evacuation chamber within said bore on one side of said annular seal and an air transfer annulus being defined between the piston and the pump cylinder bore on the other side of the seal; valve means coupled to said piston for connecting and disconnecting said evacuation chamber in fluid communication with said air transfer annulus in response to reciprocal movement of said piston; a check valve coupled to said pump housing, said check valve having a transfer port in communication with said evacuation chamber and a movable valve element for covering and uncovering said transfer port; said pump housing having a portion defining a pocket in which said transfer port is formed and in which said movable valve element is received, said movable valve element comprising a flexible member coupled to said housing, said flexible member overlying said transfer port; and, said pocket portion defining a conical valve seating surface within said pocket, and said transfer port comprising a bore intersecting said web and said conical seating surface.