| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a thermochromic writing utensil which can perform a stable frictional operation, using a friction part in the rear end of a knocking body. <P>SOLUTION: Thermochromic ink is held inside a writing element 3. The writing element 3 is held in a shaft cylinder 2 so that it can be moved in the longitudinal direction. The knocking body 6 is provided in the rear end part of the shaft cylinder 2. By pressing the knocking body 6 forward, a penpoint 31 is put in a state of projecting from a front end hole 21 of the shaft cylinder 2. The friction part 8 is provided on the external surface of the rear end part of the knocking body 6. In the side wall of the shaft cylinder 2, an operation part 9 being capable of pressing operation inward in the radial direction is provided. On the occasion of the frictional operation using the friction part 8, the operation part 9 is displaced inward in the radial direction by operating the operation part 9 to press inward in the radial direction. Then a control part 91 provided inside the operation part 9 in the radial direction comes into contact with the knocking body 6 or the friction part 8 and prevents backward movement of the friction part 8 in relation to the shaft cylinder 2. <P>COPYRIGHT: (C)2012,JPO&INPIT |
