| 摘要 |
PROBLEM TO BE SOLVED: To assist the outflow of an ink by utilizing the pressurizing action of writing pressure for a nock type ball point pen using the ink for correcting erroneous writings or the ink to be erased by a rubber eraser. SOLUTION: A ball point pen refill 21 is provided with a ball point pen tip 23 on its end and an ink storage tube 22 on its rear, and a spring 20 is inserted into the tip, and the end of the spring is so provided as to press the back of a tip ball by the end of the spring and bring the tip ball into contact with the inner edge of a ball wrapping section on the end of the tip. The ink storage tube is a pumping type pressurizing mechanism, in the constitution of which the ink and a follower preventing the evaporation of ink and following the ink when the ink is consumed on the rear end of the ink are provided, and a valve chamber to be expanded and contracted on the rear of the follower and valve elements closing the front and rear ends are provided, and the valve chamber is expanded and contracted to pressurize and evacuate the interior of the valve chamber, and the valve mechanisms in the front and at the rear are opened alternately to push in air into the rear end of the follower for pressurizing. The ink flow properties to the tips side is assisted by the above arrangement. |
