| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a writing utensil capable of surely preventing ink from leaking from a pen point by avoiding involving of air, easily interchanging an ink tank without generating dust of the pen point, and easily confirming the remaining amount by making the ink tank flexible. <P>SOLUTION: The writing utensil feeds the ink in the ink tank 12 to a pen core 10 by pressing the pen core 10 onto a writing object. An ink feeding mechanism 14 includes: a front piston body 20 in which a communicating path 20a moved back and forth with the pen core 10 and communicating the pen core 10 with a storing space part 22 is formed; a back piston body 24 in which the inside is the storing space part 22 and the storing space part 22 is communicated with the ink tank 12 side; a check valve 26 arranged in the communicating path 20a of the front piston body 20 and for preventing the ink from flowing reversely from the pen core 10 side to the storing space part 22 side; and a valve body 28 arranged in the storing space part 22 of the back piston body 24 and for preventing the ink from flowing reversely from the storing space part 22 to the ink tank 12 side. <P>COPYRIGHT: (C)2012,JPO&INPIT |
