| 主权项 |
1. A cap for a bottle having a mouth, comprising:
a body including an annular wall configured to engage the mouth of the bottle, a cylindrical aperture disposed in a protrusion generally opposite the annular wall, and a cylindrical plug rigidly attached within the aperture and defining an annular gap between an outer surface of the plug and an inner surface of the aperture; and a hollow nozzle configured to fit within the annular gap and including:
an inner wall having a lower diameter exceeding a diameter of the plug and an upper diameter tapering to become smaller than the diameter of the plug,an outer wall having a lower diameter smaller than a diameter of the inner surface of the aperture and an upper diameter tapering to become larger than the diameter of the inner surface of the aperture, the outer wall further including at least one guide protrusion having a diameter approximately equal to the diameter of the inner surface of the aperture and configured to hold the nozzle in a stable orientation with respect to the aperture, and at least one longitudinal recess formed in the outer wall and configured to allow selective passage of air; wherein the nozzle is movable within the annular gap between a retracted position in which fluid cannot pass between the outer surface of the plug and an inner surface of the nozzle due to a fluid tight seal formed between the upper diameter of the inner wall and the plug, and an extended position in which fluid can pass between the outer surface of the plug and the inner surface of the nozzle; and wherein the longitudinal recess terminates proximate to the upper diameter of the outer wall and is thus configured to allow air to flow through the recess and into the bottle when the nozzle is in the extended position, and is contained within the aperture and is thus configured to prevent air from flowing through the recess and into the bottle when the nozzle is in the retracted position. |
