Abstract: A multi-color mechanical writing instrument which contains ink tubes or reservoirs, a rotary cam having a blocking section, an inner flange or a stopper which enables a writing tip to be pushed out which is positioned underneath a cam body with a push-bar inside a rear casing, and where the inner surface of the rear casing is shaped in the form of cam walls in order to have the rotary cam turn back and forth along the cam walls with the movement of pushing the push-bar to push the tip of an ink tube out or pull it back alternatively.
© 2024 Justia
