| 摘要 |
An air tight canister (20) is taught that incorporates an integral vacuum relief valve for storing various food stuffs including powdered goods. The canister incorporates a body (22) in cylindrical shape with a lid (38) that interfaces with the top of the body for closing the canister to protect goods stored inside. The lid bottom has a downwardly depending stem (44) and one or more vents (46) adjacent to the stem that extend completely through lid creating an air passageway. A lip seal (50) is disposed securely on the lid, engaging the inside surface of the canister body in a air tight manner when the lid is inserted into the canister. A resilient vacuum relief valve (52) is positioned on the lid stem and engages the lid bottom encircling the vent preventing air passage through the vent. This arrangement provides an air tight seal when the lid is inserted and stationary, however when the lid is drawn upwardly negative pressure within the canister is created forcing the valve to break its seal and relieve vacuum within the canister. This action allows the lid to be easier to remove and to prevents dispersal of powdered contents out of the canister during lid removal.
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