摘要 |
<P>PROBLEM TO BE SOLVED: To provide a thermochromic writing utensil of which a pen tip can be sealed tightly by a cap, and of which a manufacturing cost can be suppressed low by reducing the number of components of the cap in spite of that the cap includes a ring-like seal part and friction part. <P>SOLUTION: The cap 4 is structured of a bottomed cylindrical body of which a rear end is opened and a front end is closed. The entire cap 4 is formed of elastic material. The ring-like seal part 41 is integrally formed on an inner surface of the cap 4. The pen tip 31 is sealed tightly by air-tightly fitting the ring-like seal part 41 to a pen tip side outer surface of a writing utensil body 2. An outer surface of the cap 4 is the friction part 5 that is formed of elastic material which frictions handwriting with thermochromic ink and can thermally discolor the handwriting by the generated frictional heat. <P>COPYRIGHT: (C)2012,JPO&INPIT |