Patent ID: 8328037

Claim:
A bottle cap assembly comprising: a mount having an air hole defined through a top thereof and an inlet valve engaged with the air hole, a tubular portion located in the mount and adapted to extend toward a bottle for containing liquid, the tubular portion having two spiral ribs on a bottom thereof and a seal member located at a central portion of the tubular portion; a hose unit connected to the mount and adapted to insert into the bottle; a mouthpiece unit connected to a top of the mount and including a rotatable member, a seal ring and a mouthpiece, the rotatable member having spiral grooves defined in a lower portion thereof, a knob and a first engaging groove located on a top of the rotatable member, a passage defined through a central portion of the rotatable member and a sealing groove defined in an outer surface of a mediate portion of the rotatable member, a seal ring engaged with the seal groove, the spiral grooves of rotatable member being engaged with the spiral ribs of the tubular portion for permitting rotation of the rotatable member relative to the tubular portion to dispose the rotatable member between a lowest position, at which the seal member engages the passage to prevent liquid flow from the bottle through the mouthpiece, and a highest position, at which the seal member disengages from the passage to permit liquid flow from the bottle through the mouthpiece, and a dust cap mounted to the top of the mount and accommodating the mouthpiece unit.