| 摘要 |
A baby bottle with two open ends and two end caps for securing a nipple and a pressure relief valve assembly to the ends of the bottle. The valve assembly includes an outwardly flanged inverted cup-shaped valve seat member having a base provided with an axial bore which extends from the inner to the outer face of the base and accommodates a reciprocally axially movable valve stem. The valve stem at one end thereof defines a valve head normally received in the valve seat-defining end region of the bore under the biasing force of a spring interposed between the inner face of the base and a snap-on disc carried by the valve stem. The transverse web of the bottom end cap is continuous over the full width of the cap and has a number of small openings distributed over its mid-region and, when the cap is secured to the bottle, engages the flange of the valve seat member and forces a sealing ring supported by that flange against the proximate end edge of the bottle to sealingly secure the valve assembly to the bottle. The bottom end cap serves to permit air to enter the bottle when the valve opens as the baby sucks on the nipple, and also to prevent small, easily swallowed parts of the valve assembly from inadvertently falling out of the bottle and coming into the reach of the baby.
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