| 摘要 |
A combination bottle cap and filter cartridge for use with a reservoir water bottle includes an outer sidewall having a generally cylindrical configuration and an end wall joined to the outer edge of the sidewall. The sidewall is dimensioned to be received about the mouth and neck of the bottle. A cylindrical filter cartridge extends from the cap end wall and is disposed concentrically within the sidewall. The filter cartridge includes an inner end wall disposed within the bottle neck, and a curved inner panel extends from the inner end wall to the cap end wall to define two chambers within the cartridge. A filter chamber contains a charge of granulated filter medium. A plurality of holes are formed in the inner end wall and the cap end wall to admit water from the bottle to the filter cartridge and discharge water therefrom, respectively. A pair of fiber scrims are interposed in the filter chamber between the inner and outer end walls and the filter medium to retain the granulated particles therein. The other chamber within the cartridge comprises a tubular air passage, with an inlet port extending through the cap end wall and an outlet port extending through the inner end wall. A check valve is disposed within the air passage to admit air through the passage to the bottle and prevent discharge of water therethrough.
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