| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a simply structured retractable writing instrument that facilitates replacement of a ballpoint pen refill and that allows a grip to be easily attached to the holder of a shaft tube in two-color molding. <P>SOLUTION: In the retractable writing instrument, a front shaft and a rear shaft are freely attachably/detachably screwed on to form a shaft tube body, with a grip integrally attached in two-color molding to the holder of the front shaft, and with a plurality of projections formed extending along the shaft center direction on the inner wall of the front shaft. At least a part of the projections is situated on the inner wall of the holder. The rear end face of the projections is formed away from the rear end of the front shaft, and is made circular arcuate and/or inclined, with the inner diameter expanding toward the rear end direction of the front shaft. <P>COPYRIGHT: (C)2010,JPO&INPIT |
