| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a thermochromic writing utensil with a simple structure, which permits stable frictional operation by using a friction part at the back end of a knocking body. <P>SOLUTION: A thermochromic ink is stored in a writing body 3. A pen tip 31 of the writing body 3 is made to appear and is retracted from a front end hole 21 of a shaft tube 2 by pressurizing a knocking body 6 forward. The friction part 81 which can thermally discolor handwriting of the thermochromic ink with frictional heat is disposed on a back end part outer surface of the knocking body 6. The knocking body 6 comprises a rod-like body 7 and an operation body 8 rotatably attached to the back end part outer surface of the rod-like body 7. An engagement convex part 71 is formed on a rod-like body 7 outer surface and an engagement concave part 83 is formed on an attachment hole 82 inner surface of the operation body 8. The engagement convex part 71 is brought into pressure contact with the attachment hole 82 inner surface of the operation body 8 other than the engagement concave part 83, an outer surface of the operation body 8 is swollen to the radial direction outer side of the operation body 8, thereby, the outer surface of the operation body 8 is brought into pressure contact with a back end opening part inner surface of the shaft tube 2 and the movement in the front and back direction of the operation part is blocked. <P>COPYRIGHT: (C)2013,JPO&INPIT |
