Pen with pressurizing mechanism to pressurize ink refill
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United States of America Patent
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-
Aug 12, 2014
Grant Date -
Mar 7, 2013
app pub date -
May 7, 2012
filing date -
Sep 6, 2011
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A pressurizing-type pen has a compression cylinder fitted to a rear portion of a refill holder which holds an ink-containing refill. A return spring holder holding an elastic airtight member is inserted inside the refill holder. When the compression cylinder advances, the refill holder also advances and presses the airtight member to bring the inner face of the airtight member into close contact with the refill to close a vent path. When the compression cylinder further advances, the rear space of the refill is pressurized by a compression chamber provided within the compression cylinder. Then, following the advance movement of the compression cylinder, the airtight member and the return spring holder advance together with the refill holder and the refill, and the refill is thereby maintained at the writing position. The elastic member does not make sliding contact with the refill and therefore is not abraded.
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