| 摘要 |
<p>A conventional retractable type writing instrument has problems of complex structure of the mechanism for locking/unlocking the writing body, an increased number of component parts, an difficulty in assembling operation and high cost of instrument. Further, since the conventional mechanism is incorporated in a rear part of a barrel, the barrel must be increased in length to that extent. In the present invention, an operating member movable relative to an exterior body through operation is interlocked with a refill body having a nib at its tip, and an engagement portion for engaging an engagement protrusion of an inner surface of a clip on the exterior body is formed on the operating member. The engagement protrusion is engaged with the engagement portion to lock the nib of the refill body in a state of the nib projected from a tip of the exterior body. The locking of the nib in its projected position is released by an operation to be made in the same direction as the operation for locking the nib in its projected position. When the engagement protrusion and the engagement portion are to be engaged with or disengaged from each other by the operation, a relative movement between the engagement protrusion and the engagement portion at the time of engagement or disengagement consists of a combination of a movement in a same plane direction and a movement towards or away from the plane. <IMAGE></p> |
