| 摘要 |
A low-viscosity ink ball-point pen has a tip press-fitted at its rear end into a forward end of a barrel member housing an ink source therein. A ball is rotatably held in a ball socket at the forward end of the tip and supplied with ink from the ink source through an ink-feeding capillary element extending from the ink source into an axial hole formed in the rear end portion of the tip and extending toward the ball socket. The ball socket and the hole are communicated by a reduced axial passage extending between the bottoms of the ball socket and the hole. The forward end portion of the ink-feeding capillary element cooperates with the bottom of the hole to define a substantially closed chamber of a substantial volume whereby a substantial quantity of ink can be accumulated therein for uninterrupted writing for a long period of time. In addition, the effective cross-sectional area of the capillary element, through which ink can flow toward the ball, is increased with resultant increase in the rate of ink supply through the capillary element to the ball.
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