JP2016040082A - Friction body - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent infants from accidentally swallowing a friction body that can change the color of a thermochromic ink, and thus avoid accidents such as suffocation.SOLUTION: The present invention provides a friction body that can change the color of a thermochromic ink, the friction body containing a bitter substance in a base material, the base material comprising natural rubber or synthetic rubber, or resin as the main material. When an infant puts the friction body into the mouth, its bitterness makes the infant spit out it.SELECTED DRAWING: Figure 1

Description

The present invention relates to prevention of accidental ingestion of a friction body that enables discoloration of thermochromic ink.

Although it is extremely rare, there is a possibility that an infant or the like may swallow and suffocate a friction body that can change the color of the thermochromic ink. Therefore, means capable of air circulation as shown in Patent Document 1 has been taken. ing.

JP 2006-123337

However, by providing the vent hole, the friction body is bent by the frictional operation at the time of discoloration, and a stable frictional operation cannot be obtained.
Therefore, there is an error such as a friction body that enables discoloration of thermochromic ink that is likely to be touched by an infant without providing a vent hole, or a friction body that can discolor thermochromic ink attached to the rear end of a writing instrument. It is an object of the present invention to provide a friction body that can prevent drinking and avoid an accident such as suffocation while obtaining a stable frictional motion.

The present invention has the following configuration.
By using a thermochromic ink that contains a bitter substance in a base material mainly composed of natural rubber, synthetic rubber, or resin as a friction body that enables discoloration, the baby is discharged by bitterness when it is put in the mouth.

Further, the present invention provides a friction body capable of changing the color of the thermochromic ink, a feeding device capable of feeding out a friction body capable of changing the color of the thermochromic ink by knocking or rotating operation, a writing unit at the front, and the friction body at the rear. In a writing instrument provided with a feeding device that can feed out a bitter substance, a bitter substance is contained in the base material of the friction body.

In the present invention, it is desirable not to provide a ventilation hole in the friction body.

In the present invention, it is desirable that the outer diameter is 20 mm or more or the length is 20 mm or more.

As a base material for the friction body that can change the color of the thermochromic ink, natural rubber or synthetic rubber must contain an appropriate amount of a bitter substance, kneaded with a solvent, etc., and after removing the solvent, it must be pressurized and heated. It is formed into a simple shape.

Specifically, rubber materials such as silicone rubber, nitrile rubber, ethylene propylene rubber and ethylene propylene diene rubber, and rubber elastic materials such as thermoplastic elastomers such as styrene elastomer, olefin elastomer and polyester elastomer, two or more rubbers Examples thereof include a mixture of elastic materials and a mixture of rubber elastic material and synthetic resin. In particular, it is formed from a mixture of a polypropylene resin and a styrenic thermoplastic elastomer, or a mixture of a polypropylene resin and a polypropylene thermoplastic elastomer, and the blending ratio is 1: 1 to 1: 4 by weight, respectively. And formed of a low-abrasion elastic material made of a material that does not contain a filler and has a durometer hardness A defined by JISK6251 of 70 ° to 100 °.

Bitter substances are those that have the effect of being physiologically exhaled by the bitter taste of infants when added to the mouth, and are highly safe for the human body. Bitter ingredients such as tannins, catechins, chlorogenic acid, and denatonium contained in herbal medicines. Is selected.

The thermochromic ink maintains a predetermined color (first color) at room temperature (for example, 25 ° C.) and changes to another color (second color) when the temperature is raised to a predetermined temperature (for example, 60 ° C.). After that, when the ink is cooled to a predetermined temperature (for example, −5 ° C.), the ink has a property of returning to the original color (first color) again. In the writing instrument 1 using the thermochromic ink, the second color is made colorless and the stroke drawn with the first color (for example, red) is heated to make it colorless, which is herein referred to as “erasing”. . Therefore, the frictional surface as the erasing part rubs against the writing surface on which the drawn line is written to generate frictional heat, thereby changing the drawn line to colorless, that is, erasing. Of course, the second color may be a color other than colorless.

According to the present invention, there is provided a friction body capable of discoloring the thermochromic ink, a feeding device capable of feeding out the friction body by knocking or rotating operation, a writing unit at the front, and a feeding device capable of feeding out the friction body at the rear. In writing instruments, etc., by containing a bitter substance in the base material of the friction body, when the infant contains a friction body that can change the color of the thermochromic ink in the mouth, it will be discharged due to the bitterness, preventing accidental ingestion. Therefore, accidents such as suffocation are avoided. In addition, a stable frictional operation can be obtained by not forming a vent hole in the friction body. Moreover, accidental ingestion can be further prevented by setting the outer diameter to 20 mm or more or the length to 20 mm or more.

It is a principal part longitudinal cross-sectional view of the friction body feeding apparatus using the friction body which enables discoloration of the thermochromic ink of this invention.

FIG. 1 shows an embodiment of a friction body feeding device using a friction body capable of changing the color of the thermochromic ink of the present invention. The feeding type friction body device is configured by combining the members of the cap 4, the inner cylinder 11, and the friction body holder 18, and the cap 4 has an inner hole 6 and a concave groove that are fitted on the outer periphery of the rear end of the front shaft 1 at the front. 7, a spiral groove 5 is formed at the rear of the concave groove 7, and a frictional body intrusion hole 10 having an inclined contact portion 8 at the rear end of the spiral groove 5 and opened at the rear end is provided. Yes. A clip 9 is provided on the outer peripheral side surface.

The inner cylinder 11 has an inclined rear end portion 13 that abuts against the abutting portion 8 of the cap 4 together with a hole portion through which the friction body 23 is inserted, and a long slit 12 extends from the substantially center toward the rear end portion 13. It is installed. Further, a shaft portion 14 that integrally engages with the rear end hole of the front shaft 1 in the rotation direction is provided at the front, and an outer peripheral portion of the ink storage tube 3 that stores thermochromic ink is accommodated in the inner hole of the shaft portion 14. A partition portion 17 is provided that is appropriately fixed and is in contact with the rear end of the ink containing tube 3 and has a fine through hole. Further, a flange portion 15 is provided on the outer periphery of the shaft portion 14 so as to be elastically fitted into the groove 7 of the cap. The frictional body holder 18 has a pair of elastic pieces 20 that sandwich the rear end of the frictional body 23 on the rear side, and a locking projection 21 that bites into the outer surface of the frictional body 23 on the inner surface thereof. A pair of protrusions 19 are provided on the side surface of the elastic member 20 coaxially with the elastic piece 20.

The friction body holder 18 is fitted into the inner hole portion of the inner cylinder 11 by elastic deformation of the slit 12 so that the protrusion 19 and the elastic piece 20 are fitted into the slit, and the friction body 18 is attached to the rear end of the friction body holder 18. 20 is fixed, the inner cylinder 11 is inserted from the front end of the cap 4, and the flange 15 is fitted into the concave groove 7 of the cap by elastic deformation. At this time, the protrusion 19 is fitted into the spiral groove 5 with the front end of the friction body holder 18 in contact with the step 16 at the front end of the slit of the inner cylinder 11. To be precise, when the inner cylinder is fixed to the front shaft, the cap is slightly rotated with respect to the front shaft, so that the protrusion and the spiral groove are engaged. As described above, the inner cylinder 11 is rotatably retained with respect to the cap 4 in a state where the rear end portion 13 is substantially in contact with the contact portion 8 of the cap 4, and the shaft portion 14 of the inner cylinder 11 is secured to the front shaft 1. The rotation is stopped at the rear end hole and is fixed to the ink storage tube 3. Although the cylindrical portion having the slit 12 of the inner cylinder 11 is delicate and easily deformed, the inward deformation is prevented by the engagement of the inclined contact portion 8 and the rear end portion 13, and the post-installation is stabilized. To do.

Although the friction body 23 is formed with a length of 30 mm in this embodiment, it is formed with an outer diameter or a length of 20 mm or more to prevent accidental ingestion. In addition, in the present embodiment, the friction body 23 is not provided with a vent hole in order to stabilize the operation during friction of the thermochromic ink.

By the way, in front of the front shaft 1, there is a ball-point pen writing element which is configured to feed out a thermochromic refill having a writing portion attached to the front of the ink storage tube in conjunction with the back and forth movement of the ink storage tube 3. Arranged. Further, as the writing part, a thermochromic ballpoint pen or a thermochromic marking pen in which the writing tip part appears and disappears from the shaft tip by knocking at the rear end can also be applied. Moreover, it is applicable also as a thermochromic mechanical pencil by using a mechanical pencil cursive instead of a thermochromic refill.

In the friction body feeding device, when the cap 4 is rotated left and right with respect to the front shaft 1, the friction body 23 protrudes and retracts from the rear end hole of the cap 4. If the rear end of the cap 4 is knocked while the friction body 23 is immersed, the lead can be extended. When the friction body 23 is consumed and the friction body holder 18 reaches the rear end of the cap 4, the new friction body 23 is replaced. Further, when the infant includes the friction body 23 that can change the color of the thermochromic ink in the mouth, it is discharged with a bitter taste.

(1) Front shaft (2) Inner hole (3) Ink storage tube (4) Cap (5) Spiral groove (6) Inner hole (7) Concave groove (8) Abutting part (9) Clip (10) Friction body in / out hole (11) Inner cylinder (12) Slit (13) Rear end part (14) Shaft part (15) 17 partition part 18 friction body holder 19 projection 20 elastic piece 21 locking projection 22 cylinder part 23 friction body

Claims (4)

  A friction body capable of discoloring a thermochromic ink comprising a base material mainly composed of natural rubber, synthetic rubber or resin and containing a bitter substance.   The friction body according to claim 1, wherein the writing body comprises a writing portion on the front side, a writing device including a feeding device capable of feeding the rod-shaped body to the rear, and the rod-shaped body is a friction body.   The friction body according to claim 1 or 2, wherein a ventilation hole is not provided.   The friction body according to any one of claims 1 to 3, wherein the outer diameter is 20 mm or more or the length is 20 mm or more.

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