| 摘要 |
This invention provides an inexpensive capless retractable writing tool that utilizes a vacuum controlled reservoir system to store fluid which is conveyed through a feeder to a tip. The invention includes a self sealing valve that seals the tip of the vacuum reservoir from the atmosphere and prevents the release of vapor pressure from within the valve. When the writing tool is in the retracted position, the tip of the vacuum reservoir is between the front and back ends of the valve to substantially seal the tip from outside air and prevent the release of vapor fluid from within the valve. The valve can withstand atmospheric pressure changes without giving rise to leakage of the vacuum reservoir system.
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