Air compression-type cap designed to preserve the taste of bottled drinks

摘要

A resealable cap for a drink bottle having a pump for pressurizing a liquid in the bottle and a tight sealing connection with a threaded bottle neck. The pump is a tube having a soft resinous stepped base within a cylinder which extends downward through the neck into the interior of the bottle. A seal is formed between the base of the tube and the cylinder wall. At the base of the cylinder is a valve for allowing air compressed by the soft base and tube to flow into the bottle and which is sealed shut by the higher pressure created in the bottle when the soft base is retracted. The soft base has a small expandable slit adjacent the tube and above the step forming the seal through which deforms so that air can enter the cylinder on the upstroke. The slit is compressed closed on the downstroke and prevents air from leaving so it is instead forced through the valve.