| 摘要 |
PROBLEM TO BE SOLVED: To eliminate inconvenience of carelessly protruding-retreating a writing tip part, when using a friction body capable of discoloring heat-discoloration ink.SOLUTION: A protruding-retreating operation part is arranged in an inner hole part of a barrel, and a friction body is installed in a state of properly projecting from the rear end of the barrel, and a ball point pen writing body is arranged in front of the protruding-retreating operation part, and a protective member is fastened so as to interlock with the protruding-retreating operation part by covering the friction body, and a writing tip part is locked in a protruding-retreating state from a tip port of the barrel by protruding-retreating operation, and when using the friction body, the friction body is constituted so as to become a fixed state in the axial direction.SELECTED DRAWING: Figure 1 |
