| 摘要 |
<p>A writing instrument is provided in which assembling thereof can be finished by inserting a writing medium advancing mechanism into an outer barrel from the rear end side thereof, in which the outer appearance thereof is not injured and the assembling thereof is easy. A lead advancing mechanism 10 has a chuck 13 connected with a front portion of a front tank member 12a, a chuck ring 14 surrounding an outer surface of the chuck 13, a sleeve 15 disposed so as to be able to contact a rear end of the chuck ring 14, a chuck spring 16 interposed between the sleeve 15 and a front end of the front tank member 12b to force the front tank member 12b backward. The sleeve 15 is formed with engaging projections 15a and with slits 15b each of which surrounds three sides of each engaging projection 15a, respectively, in such a manner that a resilient engaging means 15c is constructed, which can be resilient in radial directions of the sleeve. The resilient engaging portion 15c is engaged with a front end 3b of the rear barrel 3. <IMAGE></p> |
