| 摘要 |
<p>A writing instrument which uses ink of low viscosity has its barrel (1) partitioned into an ink chamber (10) and a storage cavity (6) by a partition tube (5). The storage cavity (6) is closed by an absorbent closure member (4) which supplies ink to the pen (2), and has an air intake tube (8). The ink chamber (10) communicates with the storage cavity (6) through an air-liquid interchange passage (7). On increase of pressure in the chamber (10) ink is supplied to the storage cavity (6) through passage (7) for use by the pen (2), while, on decrease of pressure, ink within cavity (6) is returned to the ink chamber (10). Thereby, the amount of ink held by the cavity (6) is restricted and leakage of ink from the pen (2) prevented.</p> |
