NEEDLE TYPE BALLPOINT PEN CHIP AND THE MANUFACTURING METHOD FOR A NEEDLE TYPE BALLPOINT PEN CHIP
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United States of America Patent
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N/A
Issued Date -
Apr 30, 2009
app pub date -
Oct 21, 2008
filing date -
Oct 22, 2007
priority date (Note) -
Abandoned
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Abstract
The object of the present invention is to provide a needle type ballpoint pen chip capable of achieving smooth writing. The needle type ballpoint pen chip of the present invention has a very small diameter, the diameters of the ball and the ink flow hole are naturally also small. In order to achieve smooth writing, it is therefore necessary to minimize to the greatest extent possible deviation in the position of the center axis line of the ink flow hole in relation to the center of the ball. To achieve the object, in the needle type ballpoint pen chip of the present invention, a solid cylindrical steel material S with a diameter of approximately 1 mm or less, rather than a pipe material, is used as its base material, and an ink flow hole is formed by performing drill cutting processing on this steel material.
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