SIDE CLICK TYPE COMPOSITE WRITING INSTRUMENT

摘要

Disclosed is a composite writing instrument including different kinds or the same kind of writing units. The composite writing instrument comprises a first writing unit having a first annular projection which is formed on an outer surface of and adjacent to a middle portion of the first writing unit and extends outward in a radial direction; a second writing unit having a second annular projection which is formed on an outer surface of and adjacent to a middle portion of the second writing unit so as to be positioned at a different height from the first annular projection and extends outward in the radial direction; a casing accommodating the first and the second writing units and having a guide rail and a slot which extend in a lengthwise direction of the casing; a supporting member fitted into an upper end of the casing in such a way as to allow upper ends of the first and second writing units to pass therethrough; a pair of springs placed around the upper ends of the first and second writing units, respectively, which pass through the supporting member, and having one end supported by the supporting member and the other end seated against a fastening member; a cap coupled to the upper end of the casing to cover an upper part of the casing; and a pressing piece inserted through the slot defined in the casing and having a predetermined elasticity.