Patent ID: 7946777

Claim:
A multi-refill writing instrument comprising: a barrel; a plurality of writing bodies accommodated in the barrel so as to be movable in a axial direction of the barrel; a plurality of elastic bodies urging the writing bodies backward; a plurality of operating bodies connected to rear ends of the corresponding writing bodies; and a plurality of window holes formed in a side wall of the barrel so as to extend in the axial direction, an opening portion, which is adapted to be opened and closed, is formed in a rear end of the barrel so that the window holes are opened rearward, and wherein the operating bodies protrude from the barrel to an outside through the window holes in the radial direction, one of the operating bodies slides forward along the window hole so that a nib of the writing body connected to the one operating body protrudes from the barrel through a front hole, and simultaneously, a nib of another writing body in a protruding state is retracted into the barrel, the writing bodies and the operating bodes are adapted to be pulled out from the barrel and to be inserted into the barrel, the writing bodies are adapted to be pulled out from the barrel for replacement, and the operating bodies are adapted to be pulled out from the barrel and to be inserted into the barrel through the opening portion.