Ballpoint pen tip, ballpoint pen utilizing the ballpoint pen tip and method of manufacturing the ballpoint pen tip
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United States of America Patent
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May 3, 2005
Grant Date -
Apr 29, 2004
app pub date -
Oct 20, 2003
filing date -
Oct 21, 2002
priority date (Note) -
Expired
status (Latency Note)
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Abstract
There is provided a ballpoint pen tip that minimizes thin spots such as impact thin spots even if upward writing or an impact causes entry of air, allows rapid return to normal writing, and minimizes manufacturing costs. A writing ball and a check ball included in the ballpoint pen tip are placed close to each other with a slight clearance therebetween to leave an inner space with a slight capacity. Thus, even if air enters from a caulking portion, the volume of the air stored inside is slight, and an air pool can be rapidly eliminated. Further, both the writing ball and the check ball can be provided in a front end of the ballpoint pen tip, and assembly operations can be easily performed without inverting the ballpoint pen tip.
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