| 摘要 |
A vacuum jar apparatus is provided, including a jar having a jar wall terminating at a jar upper end in a jar opening surrounded and defined by a jar upper rim; and a jar lid structure including a sealing panel for resting against the jar upper rim and thereby closing and sealing the jar, and including a mechanism for evacuating air from within the jar, the mechanism for evacuating air including a chamber within the lid structure having an internal volume which is enlargeable and reducible, a first air passing port between the chamber and the jar, a first check valve in the first air passing port oriented to permit air to pass from the jar into the chamber and to prevent air from passing from the chamber into the jar through the first air passing port, a second air passing port between the chamber and the atmosphere outside the chamber and the jar, a second check valve in the second air passing port oriented to pass air from the chamber into the atmosphere outside the chamber and the jar and to prevent air from passing from the atmosphere outside the chamber and the jar into the chamber; and a mechanism for enlarging and a mechanism for reducing the volume of the chamber; so that sequentially enlarging and reducing the volume of the chamber progressively expels air from the jar through the chamber and into the atmosphere outside the chamber and the jar, thereby progressively rarefying air remaining in the jar so that the interior of the jar approaches a vacuum.
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