Writing unit locking mechanism in a multiple-point writing implement including a mechanical pencil unit

摘要

A writing unit locking mechanism in a writing implement having a mechanical pencil unit and a ball point pen unit both housed in a single holder cylinder. The locking mechanism has a writing unit selection member having a shift member shiftable under gravitational force to select one or the other writing unit and operated manually to actuate a chuck in the pencil unit and a catch shoulder provided on a unit cylinder of the pencil unit and adapted to engage directly with the holder cylinder or with an engagement member resiliently supported on the holder cylinder thereby to lock the pencil unit in its writing position. The pencil unit is released from its locked state simultaneously with the release of the selection member.