Push-out-type writing implement

A writing implement comprising:

• a plurality of manipulator pieces disposed on outside;
• a plurality of actuator pieces moved by respective one of the manipulator pieces, in at least foreword and rearward directions;
• writing elements arranged in a hollow main shaft as to be slidable along an inner face of the main shaft;
• springs each applying rearward stress on respective one of the actuator pieces;
• each of said actuator pieces comprising:
• a first projecting piece projecting in a traverse-sectional wise direction of the main shaft, at forefront part of the actuator piece;
• and
• a second projecting piece likewise projecting in a traverse-sectional wise direction of the main shaft, as disposed as distanced from the first projecting piece by a predetermined length;
• said main shaft having a small-internal-diameter part in vicinity of rearmost retracted position of the first projecting portion, and having a large-internal-diameter part larger in a diameter of the small-internal-diameter part at least in a region forefront of the small-internal-diameter part;
• said second projecting piece having a cam face as shaped for creating a stress in the traverse-sectional wise direction when another second projecting portion of other one of the actuator pieces axially bears down thereto;
• and
• each of said actuator pieces being connectable with respective one of the writing elements.