| 摘要 |
PROBLEM TO BE SOLVED: To make crushing of a channel on the occasion of tapping as small as possible, while regulating slippage of a portion of contact of the fore end of a spring with a ball as far as possible, in a ball-point pen tip fitted with the spring internally. SOLUTION: An ink hole 23 making a ball house 21 communicate with a back hole 22 has a fore end part 23a of a larger bore and a rear end part 23b of a smaller bore. A channel 24 makes the ball house 21 communicate with the fore end part 23a or the rear end part 23b of the ink hole 23. Slippage of the fore end of a spring 40 is regulated by the rear end part 23b of the ink hole 23. |
