Friction tools and thermochromic writing instruments

Abstract

The present invention provides a friction tool and a thermochromic writing instrument that enable smooth flow and removal of the friction element during the assembly process, and that allow the friction element to be smoothly inserted into the mounting hole even when it is made of a relatively soft material. [Solution] A mounting hole 21 opening to the outside is provided at the end of the main body 2. A friction body 3 made of a rubber elastic material is inserted into the mounting hole 21. The friction body 3 comprises a friction portion 31 that protrudes outward from the end of the main body 2, and a mounting portion 32 that is inserted into the mounting hole 21 of the main body 2. Powder lubricant 4 is attached to the outer surface of the friction portion 31 and the outer surface of the mounting portion 32. The powder lubricant 4 is silica spherical fine particles. The amount of powder lubricant 4 attached per unit area of ​​the surface of the friction body 3 is 0.05 μg / mm 2 ~1.0 μg / mm³ 2 It is within the range.

Claims

1. A friction tool having a friction element at the end of its body that causes the ink to change color due to the frictional heat generated when the ink is rubbed, Mounting holes opening to the outside are provided at the ends of the main body. A friction body made of a rubber elastic material is inserted into the aforementioned mounting hole. The friction body comprises a friction portion that protrudes outward from the end of the main body and a mounting portion that is inserted into a mounting hole of the main body. A friction device characterized in that powder lubricant is applied to the outer surface of the friction portion and the outer surface of the mounting portion.

2. The friction tool according to claim 1, wherein the powder lubricant is silica spherical fine particles.

3. The amount of the powder lubricant adhering per unit area to the surface of the friction body is 0.05 μg / mm². ２ ~1.0 μg / mm³ ２ A friction tool according to claim 1 or 2, which is within the range of the specified item.

4. A thermochromic writing instrument comprising a barrel having a pen tip from which the thermochromic ink is contained and which can dispense the thermochromic ink, A thermochromic writing instrument characterized in that the barrel is the friction tool described in claim 1.

5. A thermochromic writing instrument comprising a barrel having a pen tip from which the thermochromic ink is contained and from which the thermochromic ink can be dispensed, and a cap that is detachably attached to the pen tip side of the barrel, A thermochromic writing instrument characterized in that the cap is the friction tool described in claim 1.

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