| 摘要 |
PROBLEM TO BE SOLVED: To provide a knock type writing instrument capable of realizing the shock cushioning action, only by using a little component, without providing a new space.SOLUTION: An O ring 8 having flexibility is provided on the outer periphery of a knock part, and the O ring 8 is sandwiched between a ring receiving part 63 provided on the inner periphery in a shaft cylinder of not making longitudinal motion and a tail valve 7 fitted to the rear end of the shaft cylinder, so that frictional force operates between the knock part and the O ring 8. A shock of the longitudinal motion of the knock part is relieved by this frictional force.SELECTED DRAWING: Figure 3 |
