| 摘要 |
PROBLEM TO BE SOLVED: To provide a rotation operation type writing tool 1 in which a connection cylinder 17 whose rear part is rotatably fixed to a rear axis 7 and a front axis 4 to which a front part of the connection cylinder 17 is attached, hardly become in an idling state.SOLUTION: A gradual chevron shaped projection part 17f having an apex 17c on an intermediate position of a cross direction and thickness becomes thicker from a front end 17d and a rear end 17e to the apex 17c, is formed in front of a connection cylinder 17 by cutting work, and plural through holes 17g are provided on a side surface of the connection cylinder 17, for dividing the projection part 17f by the through holes 17g, and a corner part 17h is formed on an end edge of the apex of the projection part 17f. |
