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Title:
DIRECT LIQUID TYPE WRITING IMPLEMENT
Document Type and Number:
Japanese Patent JP2013043345
Kind Code:
A
Abstract:

To provide a direct liquid type writing implement capable of maintaining stable writing performance over a long period of time even though a pipe type ballpoint pen tip is adopted as a pen point thereof.

The direct liquid type writing implement includes the pen point 2, an ink tank 4 that directly stores ink, and an ink holding member 3 that is arranged between the pen point 2 and the ink tank 4 and temporarily holds ink overflown in association with an increase in the inner pressure of the ink tank 4. The ink tank 4 is detachably attached at the rear of the ink holding member 3. The pen point 2 is formed of a ballpoint pen tip in which a ball 24 is rotatably held by an inward tip edge 22 that is formed by press-deforming a tapered tip part of a metallic pipe 2 inward in the radial direction and a plurality of inward protrusions 23 that are formed by press-deforming side walls in the vicinity of the tip of the metallic pipe 2 inward in the radial direction. An antiwear coating layer 25 is provided on the inside of each protrusion 23 and/or on the surface of the ball 24.


Inventors:
SEKINE NOBUO
Application Number:
JP2011182142A
Publication Date:
March 04, 2013
Filing Date:
August 24, 2011
Export Citation:
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Assignee:
PILOT CORP
PILOT INK CO LTD
International Classes:
B43K7/02; B43K1/08
Domestic Patent References:
JP2010240931A2010-10-28
JP2000343869A2000-12-12
JP2005324336A2005-11-24
JP2004338134A2004-12-02
JPH0966692A1997-03-11
JP2010240931A2010-10-28
JP2000343869A2000-12-12