JP6038638B2 - Thermochromic writing instrument - Google Patents

Description

  The present invention relates to a thermochromic writing instrument. More specifically, a nib capable of ejecting thermochromic ink and a friction body made of a low-abrasion elastic material capable of thermally discoloring the handwriting by rubbing the handwriting of the thermochromic ink with frictional heat generated at that time. And a thermochromic writing instrument.

  Conventionally, there has been known a thermochromic writing instrument with a friction body that thermally changes a handwriting written on paper using a thermochromic ink with frictional heat when friction is made. For example, Patent Document 1 discloses reversible thermochromic. The structure is provided with a friction body at the rear end of the shaft cylinder of the writing instrument with built-in ink and the top of the writing instrument cap, and the writing instrument with the thermochromic ink written on the writing instrument is provided on the writing instrument. A structure that can be thermally discolored by a friction body is disclosed.

  In addition, in the writing instrument described in Patent Document 1, the friction body made of an elastic material is always in a state of protruding outward, looks visually cheap, and, further, dust or dirt adhered to the friction body when not in use. In some cases, the paper surface was soiled during friction. Therefore, Patent Document 2 proposes a structure in which the friction body protrudes from the cap when in use, and the friction body is inserted into the intrusion hole provided in the cap when not in use. However, in the structure of Patent Document 2, even when the friction body is immersed, the end of the friction body is exposed to the outside through the intrusion hole.

  By the way, in a writing instrument such as a mechanical pencil provided with an eraser at the rear end of the shaft tube, the eraser is covered with an eraser when not in use in order to prevent the eraser from becoming dirty and to prevent the design from being deteriorated due to exposure of the eraser. It is common to attach a cover so that the writing instrument does not look bad. Among such writing instruments, particularly high-grade writing instruments often employ a structure in which the shaft tube and the cover are attached by screwing. Therefore, it is possible to adopt this structure for the thermochromic writing instrument provided with the friction body described above, but in the structure in which the cover is attached to the shaft cylinder by screwing, if the screwing state is loosened even slightly, There is a problem in that the appearance of the writing instrument may be deteriorated by losing the cover because the cover easily comes off and falls off.

  In addition, as a method of making it difficult to loosen the screwed state of the cover covering the eraser described above, for example, there are structures disclosed in the prior art document 3 and the prior art document 4. In the structure of the prior art document 3, by arranging an O-ring that is an elastic body inside the cover (tail crown), when the cover is screwed into the shaft cylinder, the rear end portion of the shaft cylinder becomes the O-ring. It has a structure that prevents contact and loosening. Further, in the structure of the prior art document 4, a protrusion is provided on the large cap, a protrusion corresponding to the protrusion of the large cap is provided on the small cap that is screwed to the end of the large cap, and the small cap is screwed on the large cap. In this case, the convex portion of the small cap can get over the protrusion of the large cap and prevent loosening. However, the structure of the prior art document 3 requires a separate member called an O-ring, and there is a problem that it is difficult to mount the O-ring inside the cover. Moreover, in the structure of the prior art document 4, it is necessary to form protrusions and protrusions on the outer surface of the large cap and the inner surface of the small cap, and a method other than injection molding the large cap and the small cap with a resin material, For example, it is difficult to form metal materials by cutting.

JP 2004-148744 A JP 2009-126102 A JP 2009-61630 A JP 2002-362208 A

  The present invention solves the above-mentioned conventional problems, and an object of the present invention is to provide a thermochromic writing instrument that can avoid the frictional body from becoming dirty when not in use.

The present invention
“1. a nib that can eject thermochromic ink, and a friction body made of a low-abrasion elastic material that can rub the handwriting of the thermochromic ink and thermally change the handwriting with frictional heat. A thermochromic writing instrument comprising: a shaft member; a friction member projecting from an end of the shaft member; and a cover attached to the shaft member to cover the friction member. Then, the cover is moved forward with the shaft member while being engaged, and a friction part, which is an end of the friction body, is brought into contact with the bottom of the cover to thereby prevent the cover from rotating. Discoloring writing instrument.
2. A nib capable of discharging thermochromic ink, and a friction body made of a low-abrasion elastic material capable of rubbing the handwriting of the thermochromic ink and thermally discoloring the handwriting by frictional heat generated at that time. A thermochromic writing instrument, wherein the writing instrument includes a shaft member, a friction body protruding from an end of the shaft member, and a cover that is attached to the shaft member and covers the friction body, A wiping body is provided at the bottom of the cover so as to slidably contact with the friction body to wipe off dirt on the friction body, and the cover is moved forward and engaged with the shaft member, and the friction member is engaged with the cover wiping body A thermochromic writing instrument having a structure in which the friction part, which is an end of the body, is brought into contact with the cover to prevent the cover from rotating. It is.

  The elastic material constituting the friction body is preferably a synthetic resin (rubber or elastomer) having elasticity. For example, silicone resin, SBS resin (styrene-butadiene-styrene copolymer), SEBS resin (styrene-ethylene-butylene-styrene). Copolymer), fluorine resin, chloroprene resin, nitrile resin, polyester resin, ethylene propylene diene rubber (EPDM) and the like. The friction body according to the present invention is not made of a highly wearable elastic material (for example, an eraser), but needs to be made of a low wear elastic material that hardly generates wear debris (erasure debris) during friction. Yes, even if the friction body is used for friction, the shape of the friction body does not change.Therefore, the contact relationship between the friction body and the bottom of the cover, and the contact between the friction body and the wiping body disposed on the cover. The relationship does not change.

  The cover that covers the friction body can be formed into an arbitrary shape such as a hemispherical shape or a cylindrical shape. If the cover is attached to the shaft member, the cover is open and has a bottom on the opposite side. Good. The bottom of the cover may not be completely closed, and a structure may be provided in which a ventilation hole is provided in a part of the cover so that air circulation can be temporarily ensured even if the cap is swallowed. In this case, the vent hole needs to be formed in a position and a size that are difficult for fingers and dust to touch and prevent the friction part of the friction body from being soiled when the writing instrument is accommodated in a pencil case or a writing stand. In addition, as a material constituting the cover, a synthetic resin (for example, polycarbonate, polyethylene, polypropylene, ABS resin, or the like), or a metal such as brass or stainless steel can be used.

  The wiping body that is in sliding contact with the friction body has an uneven surface such as a sponge, brush, or felt, and the wiping body that is in pressure contact with the friction body is gradually moved when the cover is moved forward and engaged with the shaft member. It should be elastically deformed. When a sponge is used as the wiping body, the dirt that adheres to the friction body up to the inside of the wiping body is better in the structure in which the bubbles are connected in the open cell type than in the structure in which the bubbles are not connected to each other. This is preferable because it can be easily absorbed. When using a brush as a wiping body, a structure in which hair made of natural fibers or synthetic fibers is planted on a soft cloth or a resin material formed along the inner shape of the cover, or a natural fiber or A structure in which hairs made of synthetic fibers are directly planted can be obtained. In order to bring the wiping body and the friction body into sliding contact with each other when the cover is moved forward while being engaged with the shaft member, the wiping body is fixed so as not to move with respect to the bottom of the cover. In the case where the cover and the wiping body are separately formed, the wiping body may be fixed to the cover with an adhesive or a double-sided tape.

  The relationship between the shaft member and the cover is, for example, that a male screw portion is formed at the end of the shaft member and a female screw portion is formed on the cover, or a protrusion is formed on the shaft member or cover and the shaft member or cover is formed. A spiral groove or an inclined groove can be formed and engaged with the shaft member by advancing the cover while rotating, and the friction body abuts against the bottom of the cover or the wiping body so that the cover and the shaft can be engaged. The cover is elastically separated from the member, and the cover and the shaft member are locked in the rotational direction to suppress the elastic force in the linear direction in which the shaft member and the cover are separated from each other. The structure should be able to prevent the dropout.

  The thermochromic writing instrument of the present invention can avoid contamination of the friction body when not in use.

It is a figure of the thermochromic writing instrument of a present Example. (Examples 1-3) It is an end view of the state which removed the cover from the shaft member. Example 1 It is a figure of the state which removed the cover from the shaft member. Example 1 It is an end elevation of a state where a cover is mounted on the shaft member. Example 1 It is a figure of the state which attached the cover to the shaft member. Example 1 It is an end view of the state which removed the cover from the shaft member. (Example 2) It is a figure of the state which removed the cover from the shaft member. (Example 2) It is an end elevation of a state where a cover is mounted on the shaft member. (Example 2) It is a figure of the state which attached the cover to the shaft member. (Example 2) It is an end view of the state which removed the cover from the shaft member. (Example 3) FIG. 11 is an end view of the shaft member with a cover attached. (Example 3)

  Examples 1 to 3 of the thermochromic writing instrument according to the present invention will be described below with reference to the drawings. In addition, in order to make explanation easy to understand, the same number is attached | subjected about the same member and the same part in drawing. Also, the pen tip side is expressed as front, and the opposite side is expressed as rear.

  As shown in FIG. 1, in the writing instrument 1, a front shaft 2 and a rear shaft 3 constitute a shaft member 4, a friction body 5 made of a low-wear styrene-based elastomer, and an end friction portion 5a having a shaft member 4 It is press-fitted and fixed so as to project from a rear end opening 3b provided at the rear end 3a. Further, a cover 6 (16, 26) can be attached to the rear end portion 3a of the shaft member 4, and the rear shaft 3 is rotated with respect to the front shaft 2 to be accommodated inside the shaft member 4. The pen point 7 of the cursive body is structured to be able to appear and disappear from the front end opening 2a. Although the writing instrument 1 is not shown in the drawing, the thermochromic ink contained in the cursive body can be written on the paper surface by the pen tip 7, and the written handwriting is rubbed and rubbed by the friction portion 5 a of the friction body 5. This structure enables thermal discoloration with heat.

  Next, Example 1 will be described in detail with reference to FIGS. The cover 6 of Example 1 is provided with an opening 6a on the front side to be attached to the shaft member 4, and the rear side on the opposite side is formed in a hemispherical shape. Further, a female screw portion 6b is formed on the inner surface of the opening 6a, and can be attached to the male screw portion 3c formed on the rear end portion 3a of the shaft member 4 by screwing.

  In the first embodiment, the female screw portion 6b of the cover 6 is screwed and attached to the male screw portion 3c of the shaft member 4, so that the friction body 5 is covered with the cover 6 when not in use and the friction portion 5a is soiled. When the friction part 5a of the friction body 5 abuts against the bottom 60 of the cover 6, the cover 6 and the shaft member 4 are elastically separated by the elasticity of the friction body 5. At the same time, the elastic force in the linear direction in which the shaft member 4 and the cover 6 are separated in the engaged state (screwing) in the rotation direction of the shaft member 4 and the cover 6 is suppressed. It became possible to prevent the dropout.

  Next, Example 2 will be described in detail with reference to FIGS. The cover 16 of Example 2 is fixed to the bottom 60 with an open-cell foamed urethane sponge as a wiping body 8 with an adhesive (not shown). Since other points are the same as those of the first embodiment, description thereof is omitted.

  In the second embodiment, the female screw portion 6b of the cover 16 is screwed and attached to the male screw portion 3c of the shaft member 4, so that the friction body 5 is covered with the cover 16 when not in use, and the friction portion 5a is soiled. Since the friction part 5a of the friction body 5 abuts against the wiping body 8 fixed to the cover 16, the cover 16 and the shaft member 4 are relatively moved by the elasticity of the wiping body 8 which is a sponge. And the elastic force in the linear direction in which the shaft member 4 and the cover 16 are separated from each other in the engaged state (screwing) in the rotation direction of the shaft member 4 and the cover 16 is suppressed. As a result, the cover 16 can be prevented from falling off. In addition, when the cover 16 is screwed onto the shaft member 4, the friction portion 5 a of the friction body 5 is in sliding contact with the wiping body 8 while being pressed, so that dirt attached to the friction portion 5 a when the friction body 5 is used It could be removed by the wiping body 8.

  Next, Example 3 will be described in detail with reference to FIGS. 10 and 11. The cover 26 of Example 3 is fixed to the bottom portion 60 with an adhesive (not shown) as a wiping body 9 made of a brush in which a hair bundle 9b made of nylon is planted on a base cloth 9a. Since other points are the same as those of the first embodiment, description thereof is omitted.

  In the third embodiment, the female screw portion 6b of the cover 26 is screwed and attached to the male screw portion 3c of the shaft member 4, so that the friction body 5 is covered with the cover 26 when not in use, and the friction portion 5a is soiled. Since the friction part 5a of the friction body 5 abuts against the wiping body 9 fixed to the cover 26, the cover 26 and the shaft member 4 are relatively moved by the elasticity of the wiping body 9 as a brush. And the elastic force in the linear direction in which the shaft member 4 and the cover 26 are separated from each other in the engaged state (screwing) in the rotation direction of the shaft member 4 and the cover 26 is suppressed. As a result, the cover 26 can be prevented from falling off. Further, when the cover 26 is screwed onto the shaft member 4, the friction portion 5 a of the friction body 5 is in sliding contact with the hair bundle 9 b of the wiping body 9, so that it adheres to the friction portion 5 a when the friction body 5 is used. The removed dirt could be removed by the wiping body 9.

DESCRIPTION OF SYMBOLS 1 ... Writing instrument, 2 ... Front shaft, 2a ... Front end opening part,
3 ... rear shaft, 3a ... rear end, 3b ... rear end opening, 3c ... male screw,
4 ... shaft member, 5 ... friction body, 5a ... friction part,
6, 16, 26 ... cover, 6a ... opening, 6b ... female screw, 60 ... bottom,
7 ... nib, 8 ... wiper (sponge),
9 ... wiping body (brush), 9a ... base cloth, 9b ... hair bundle.

Claims (2)

A nib capable of discharging thermochromic ink, and a friction body made of a low-abrasion elastic material capable of rubbing the handwriting of the thermochromic ink and thermally discoloring the handwriting by frictional heat generated at that time. A thermochromic writing instrument, wherein the writing instrument includes a shaft member, a friction body protruding from an end of the shaft member, and a cover that is attached to the shaft member and covers the friction body, A thermochromic writing instrument having a structure in which the cover is rotated and advanced while being engaged with the shaft member, and a friction portion which is an end portion of the friction body is brought into contact with the bottom portion of the cover to thereby prevent the cover from rotating. . A nib capable of discharging thermochromic ink, and a friction body made of a low-abrasion elastic material capable of rubbing the handwriting of the thermochromic ink and thermally discoloring the handwriting by frictional heat generated at that time. A thermochromic writing instrument, wherein the writing instrument includes a shaft member, a friction body protruding from an end of the shaft member, and a cover that is attached to the shaft member and covers the friction body, A wiping body is provided at the bottom of the cover so as to slidably contact with the friction body to wipe off dirt on the friction body, and the cover is moved forward and engaged with the shaft member, and the friction member is engaged with the wiping body of the cover. A thermochromic writing instrument having a structure in which the friction part, which is an end of the body, is brought into contact with the cover to prevent the cover from rotating.

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