Pressurized writing instrument employing a compressible piston member
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United States of America Patent
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Mar 26, 2002
Grant Date -
N/A
app pub date -
Mar 8, 2000
filing date -
Mar 8, 2000
priority date (Note) -
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Abstract
A pressurized writing device comprising an ink tube having a first end and second end, a writing tip at the first end, an end plug at the second end, a pressurizing system. The pressurizing system applies a force to a writing medium in the ink tube to force the writing medium out the writing tip pressurization system includes, a compressible ink driving member. The compressibility of the ink driving member assures a secure seal of the writing medium in the ink tube. Additionally, the compressibility permits the ink driving member to wipe ink off the interior surface of the ink tube as ink is expended. Ink residue in the ink tube is thus minimized. In a preferred embodiment, the ink driving member is spherical to facilitate manufacture of the ink driving member and assembly of the writing instrument. The spherical shape also enhances the sealing and wiping effects of the compressible ink driving member.
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