JP2009208312A - Writing utensil cap and thermochromic writing utensil - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a writing utensil cap which reduces the number of components to be fitted to a cap body, and to minimize a manufacturing cost, and also to provide a thermochromic writing utensil. <P>SOLUTION: This thermochromic writing utensil has a friction part 6 on the forward end part of a cap 3, which enables heat discoloring of thermochromic handwriting by friction heat generated when the handwriting is rubbed. In addition, a pen point sealing part 7 which closely seals the forward end of the pen point 21 in close contact with it is arranged inside the cap 3. Further, a resilient member 5 formed integrally of the friction part 6 and the pen point sealing part 7 is sealed to the forward end part of the cap body 4. The resilient member 5 is formed of a cylindrical part 51 with an open forward end and a cup-like part 52 which is connected integrally with the rear end of the cylindrical part 51 and opened toward the rear. The forward end part of the cylindrical part 51 serves as the friction part 6 and the inner face of the cup-like part 52 as the pen point sealing part 7. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

The present invention relates to a writing instrument cap and a thermochromic writing instrument using the same. Specifically, a writing instrument cap including a friction part capable of thermally discoloring thermochromic handwriting with frictional heat, and a pen point seal part that seals the front end of the pen tip in close contact with the front end of the pen point, and the use thereof The present invention relates to a thermochromic writing instrument.

Conventionally, Patent Document 1 discloses a cap for a writing instrument in which a rubbing member serving as a discoloring tool that discolors thermochromic handwriting by frictional heat is attached to the front end of the cap body, and a pen point seal member is disposed inside the cap body. Is disclosed.

JP 2006-123337 A

In the conventional thermochromic writing instrument, the number of parts increases and the assembly process increases due to two types of parts (a scraping member and a pen point seal member) attached to the cap body, and the manufacturing cost is inevitably increased.

The present invention solves the above-mentioned conventional problems, and intends to provide a cap for a writing instrument and a thermochromic writing instrument that can reduce the number of components attached to the cap body and keep the manufacturing cost low. It is. In the present invention, “front” refers to the closed side of the cap, and “rear” refers to the open side of the cap.

[1] A first invention of the present application is provided with a friction portion 6 capable of rubbing a thermochromic handwriting at a front end portion and thermally discoloring the handwriting by frictional heat generated at that time, and a pen nib inside. 21. A cap for a writing instrument having a nib seal portion 7 that is in close contact with the nib 21 and seals the front end of the nib 21, and an elastic member 5 in which the friction portion 6 and the nib seal portion 7 are integrally formed. It is a requirement that it is fixed to the front end portion of the (claim 1).

In the writing instrument cap 3 according to the first invention, the elastic member 5 in which the friction portion 6 and the pen point seal portion 7 are integrally formed is fixed to the front end portion of the cap body 4. The number of components to be attached is reduced, the assembly process is simplified, and the manufacturing cost can be kept low. In the present invention, examples of means for fixing the elastic member 5 to the cap body 4 include press fitting, fitting, engagement, screwing, adhesion, welding, two-color molding, and the like.

[2] According to a second invention of the present application, in the first invention, the elastic member 5 is integrally connected to a cylindrical portion 51 having an open front end and a rear end of the cylindrical portion 51, and A cup-shaped portion 52 that opens to the rear, the cup-shaped portion 52 projects forward from the rear end of the tubular portion 51, and the front end of the cup-shaped portion 52 is positioned in the tubular portion 51. It is a requirement that the front end portion of the shaped portion 51 is the friction portion 6 and the inner surface of the cup-like portion 52 is the pen point seal portion 7 (Claim 2).

The writing instrument cap 3 according to the second invention has a configuration in which the front end of the cup-shaped portion 52 is located in the cylindrical portion 51 (that is, a configuration in which the cup-shaped portion 52 does not protrude outward from the front end of the cylindrical portion 51). Therefore, when the cap 3 is removed from the writing instrument body 2 and the writing surface such as a paper surface is rubbed using the front end portion (that is, the friction portion 6) of the cylindrical portion 51 of the cap 3, the cup-shaped portion 52 is An appropriate frictional discoloration work can be performed without contacting the writing surface, and damage to the cup-shaped portion 52 (that is, the pen tip seal portion 7) can be avoided.

[3] The third invention of the present application is that the writing tool body 2 is provided with a pen tip 21 that contains thermochromic ink inside and can discharge the thermochromic ink at one end, and the pen tip 21 of the writing tool body 2. A cap 3 that can be attached to the side, and a friction portion 6 that can rub the handwriting of the thermochromic ink at the front end portion of the cap 3 and rub the handwriting with frictional heat generated at that time. 3 is a thermochromic writing instrument provided with a pen tip seal portion 7 for sealing the front end of the pen tip 21 in close contact with the pen tip 21, wherein the friction portion 6 and the pen tip seal portion 7 are integrally formed. It is a requirement that the elastic member 5 is fixed to the front end portion of the cap body 4 (Claim 3).

The thermochromic writing instrument 1 according to the third aspect of the present invention is formed by fixing an elastic member 5 in which a friction portion 6 and a pen point seal portion 7 are integrally formed to a front end portion of a cap body 4, thereby providing a cap body 4. As a result, the number of parts to be attached is reduced, the assembly process is simplified, and the manufacturing cost can be reduced. In the present invention, examples of means for fixing the elastic member 5 to the cap body 4 include press fitting, fitting, engagement, screwing, adhesion, welding, two-color molding, and the like.

[4] According to a fourth invention of the present application, in the third invention, the elastic member 5 is integrally connected to a cylindrical portion 51 having an open front end and a rear end of the cylindrical portion 51; The cup-shaped portion 52 includes a cup-shaped portion 52 that opens rearward, and the inner surface of the cup-shaped portion 52 serves as a pen-tip seal portion 7, and the cap-shaped portion 52 is removed from the pen-tip 21 side of the writing instrument body 2. Projecting forward from the rear end of the cylindrical part 51, the front end of the cup-shaped part 52 is positioned in the cylindrical part 51, and the front end of the cylindrical part 51 is used as the friction part 6 (Claim 4). Is a requirement.

The thermochromic writing instrument 1 of the fourth invention has a configuration in which the front end of the cup-shaped part 52 is located in the cylindrical part 51 in a state where the cap 3 is removed from the pen tip 21 side of the writing tool body 2 (that is, cup-shaped). Since the portion 52 does not protrude outward from the front end of the cylindrical portion 51), the cap 3 is removed from the writing instrument body 2, and the front end portion (that is, the friction portion 6) of the cylindrical portion 51 of the cap 3 is used. When the writing surface such as a paper surface is rubbed, the cup-shaped portion 52 does not come into contact with the writing surface, and an appropriate frictional discoloration work is possible, and the cup-shaped portion 52 (that is, the pen tip seal portion 7) is damaged. Can be avoided.

[5] According to a fifth aspect of the present invention, in the fourth aspect, the cap 3 is attached to the pen tip 21 side of the writing instrument body 2, the pen tip 21 is brought into close contact with the inner surface of the cup-shaped portion 52, and the cup It is a requirement that the front end of the cup-shaped portion 52 is located inside the tubular portion 51 when the shape-shaped portion 52 is deformed forward (Claim 5).

In the thermochromic writing instrument 1 of the fifth invention, the cap 3 is mounted on the pen tip 21 side of the writing tool body 2, the pen tip 21 is brought into close contact with the inner surface of the cup-like portion 52, and the cup-like portion 52 is in front. Since the front end of the cup-shaped portion 52 is positioned inside the cylindrical portion 51 when the member is stretched and deformed (that is, the cup-shaped portion 52 does not protrude outward from the front end of the cylindrical portion 51). When the cap 3 is mounted on the pen tip 21 side of the writing instrument body 2 and the writing surface such as a paper surface is rubbed using the front end portion (that is, the friction portion 6) of the cylindrical portion 51 of the cap 3, The shape portion 52 does not come into contact with the writing surface, and proper frictional discoloration work can be performed, and damage to the cup-shaped portion 52 (that is, the pen tip seal portion 7) can be avoided.

-Elastic member In the present invention, the elastic member 5 is made of an elastic material. Examples of the elastic material include an elastic synthetic resin (rubber, elastomer). For example, silicone resin, SBS resin (styrene-butadiene-styrene copolymer), SEBS resin (styrene-ethylene-butadiene-styrene copolymer). ), Fluorine resin, chloroprene resin, nitrile resin, polyester resin, olefin resin, ethylene propylene diene rubber (EPDM) and the like.

The elastic material is preferably made of a low-abrasion elastic material that hardly generates wear debris during friction rather than a high-abrasion elastic material (for example, an eraser).

-Thermochromic ink In the present invention, the thermochromic ink is preferably a reversible thermochromic ink. The reversible thermochromic ink is a heat decoloring type that is decolored by heating from a colored state, a color memory retaining type that reversibly stores a colored state or a decolored state in a specific temperature range, or from a decolored state. Various types such as a heating coloring type that develops color by heating and returns to a decolored state by cooling from the colored state can be used alone or in combination.

In the present invention, as shown in FIG. 3, the shape of the curve plotting the change in color density due to the temperature change is opposite to the case where the temperature is raised from the lower temperature side than the color change temperature range, and from the higher temperature side than the color change temperature range. The color changes by following a different path from the case of lowering, and the color development state in the low temperature range below the complete color development temperature (t ₁ ) or the color erase state in the high temperature range above the complete color erase temperature (t ₄ ) It is preferable to apply a color memory retention type thermochromic ink that can be stored and retained in a specific temperature range [temperature range between t _{2 and} t ₃ (substantially two-phase retention temperature range)]. In FIG. 3, ΔH indicates a temperature width (ie, hysteresis width) indicating the degree of hysteresis. When the value of ΔH is small, only one of the two states before and after the color change can exist. When the value of ΔH is large, it is easy to maintain each state before and after the color change.

The substantial two-phase holding temperature range can be set according to the purpose, but in the present invention, the high temperature side discoloration point [complete decoloring temperature (t ₄ )] is 25 ° C. to 95 ° C. (preferably 36 ° C. ˜90 ° C.), and the low temperature side discoloration point [complete color development temperature (t ₁ )] may be set in the range of −30 ° C. to + 20 ° C. (preferably −30 ° C. to + 10 ° C.). It is valid. Accordingly, it is possible to effectively maintain the color exhibited in the normal state (daily life temperature range), and it is possible to easily change the handwriting by the reversible thermochromic ink with the frictional heat generated by the friction body.

The writing instrument cap of the present invention can reduce the number of components attached to the cap body, simplify the assembly process, and keep the manufacturing cost low.

The thermochromic writing instrument of the present invention can reduce the number of components attached to the cap body, simplify the assembly process, and reduce the manufacturing cost.

Embodiments of the writing instrument cap and thermochromic writing instrument of the present invention are shown in FIGS.
The thermochromic writing instrument 1 includes a writing instrument body 2 and a cap 3 that can be attached to the writing instrument body 2.

-Writing instrument main body Inside the writing instrument main body 2, thermochromic ink is accommodated. A pen tip 21 capable of discharging the thermochromic ink is provided at the front end of the writing instrument body 2. The thermochromic ink is ejected from the pen tip 21, and a handwriting (thermochromic handwriting) of the thermochromic ink is obtained on a writing surface such as paper.

- thermochromic ink the thermochromic ink is, the low-temperature side color change point (complete coloring temperature t ₁₎ is set to any temperature in the range of -30 ℃ ~-10 ℃, the high temperature side color change point (complete decoloring temperature A reversible thermochromic ink in which t ₄ ) is set to an arbitrary temperature in the range of 60 ° C. to 80 ° C. and the hysteresis width ΔH is in the range of 40 ° C. to 60 ° C. is employed.

-Pen tip The pen tip 21 employs a ball-point pen tip having a ball rotatably held at the front end.

The cap cap 3 includes a cap body 4 formed of a cylindrical body having both ends (that is, a front end portion and a rear end portion) opened, and an elastic member 5 fixed to the front end opening portion of the cap body 4. The cap body 4 is obtained by injection molding or metal of the synthetic resin (for example, polypropylene, polyethylene, polyethylene terephthalate, polycarbonate, etc.). An annular protrusion 41 is integrally formed on the inner peripheral surface of the front end opening of the cap body 4.

Elastic member The elastic member 5 is made of an elastic material (for example, silicone resin, SBS resin, SEBS resin, ethylene propylene diene rubber, etc.). The elastic member 5 includes a cylindrical portion 51 whose front end is opened, and a cup-shaped portion 52 that is integrally connected to the rear end of the cylindrical portion 51 and opens rearward.

The outer peripheral edge of the front end of the cylindrical part 51 is formed in a convex curved surface shape. The outer peripheral edge of the front end of the cylindrical part 51 is mainly the friction part 6. The cup-shaped portion 52 has a mortar-shaped (conical concave surface) inner surface, and the center portion of the inner surface of the cup-shaped portion 52 is the pen tip seal portion 7.

The rear end of the cup-shaped part 52 is connected to the rear end opening of the cylindrical part 51. In a state where the cap 3 is removed from the pen tip 21 side of the writing instrument body 2, the cup-shaped portion 52 protrudes forward from the rear end of the tubular portion 51, and the top of the cup-shaped portion 52 (cup-shaped portion). The front end of 52 is located inside the cylindrical portion 51.

The elastic member 5 is inserted into the front end opening of the cap body 4 from the front of the cap body 4 and is fixed to the front end of the cap body 4. In a state where the elastic member 5 is fixed to the front end portion of the cap body 4, the friction portion 6 is positioned in front of the front end portion of the cap body 4, and the pen point seal portion 7 is located inside the cap 3 (inside the cylindrical portion 51 or It is located in the cap body 4).

An annular groove 51 a is formed on the outer peripheral surface of the intermediate part of the cylindrical part 51. In a state where the elastic member 5 is fixed to the front end opening of the cap body 4, the annular protrusion 41 of the front end opening of the cap body 4 is engaged with the annular groove 51 a on the outer peripheral surface of the cylindrical portion 51. Thereby, the elastic member 5 is prevented from coming off from the cap body 4 in the front-rear direction.

As shown in FIG. 1, in the state where the cap 3 of the present embodiment is removed from the pen tip 21 side of the writing instrument body 2, the thermochromic handwriting formed on the writing surface such as paper is Friction is caused by the friction portion 6 at the front end portion of the shape portion 51, and the thermochromic handwriting can be thermally discolored by frictional heat generated at that time. At that time, the front end of the cup-shaped part 52 (that is, the outer surface of the top of the cup-shaped part 52) is located in the cylindrical part 51 and does not protrude outward from the front end of the cylindrical part 51. It is possible to avoid bringing 52 into contact with the writing surface, enabling proper frictional discoloration work and avoiding damage to the cup-shaped portion 52.

As shown in FIG. 2, when the cap 3 is attached to the pen tip 21 side of the writing instrument main body 2, the pen tip 21 is brought into close contact with the inner surface of the cup-shaped portion 52 (that is, the pen-tip seal portion 7), and the cup-shaped portion 52. Is stretched forward. At this time, since the front end of the cup-shaped portion 52 (that is, the top outer surface of the cup-shaped portion 52) is located in the cylindrical portion 51 and does not protrude outward from the front end of the cylindrical portion 51, the cap 3 is attached to the writing instrument body 2. Even when it is rubbed while attached to the pen tip 21 side, the cup-shaped portion 52 can be prevented from coming into contact with the writing surface, an appropriate frictional discoloration work can be performed, and damage to the cup-shaped portion 52 can be avoided. .

It is a principal part longitudinal cross-sectional view of embodiment of this invention. It is a principal part longitudinal cross-sectional view of the state which mounted | wore the pen-tip side of the writing instrument main body with the cap of FIG. It is explanatory drawing which shows the color change behavior of a thermochromic ink.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Thermochromic writing instrument 2 Writing instrument main body 21 Nib 3 Cap 4 Cap main body 41 Annular protrusion 5 Elastic member 51 Cylindrical part 51a Annular groove 52 Cup-shaped part 6 Friction part 7 Nib seal part

Claims (5)

A nib that includes a friction part capable of rubbing a thermochromic handwriting at the front end and capable of thermally discoloring the handwriting by frictional heat generated at that time, and seals the nib front end in close contact with the nib A writing instrument cap provided with a seal part, wherein an elastic member in which a friction part and a pen point seal part are integrally formed is fixed to a front end part of a cap body. The elastic member includes a cylindrical portion having an opening at the front end, and a cup-shaped portion integrally connected to the rear end of the cylindrical portion and opening to the rear, and the cup-shaped portion is connected to the rear of the cylindrical portion. The front end of the cup-shaped portion is positioned in the cylindrical portion, protrudes forward from the end, the front end portion of the cylindrical portion is a friction portion, and the inner surface of the cup-shaped portion is a pen tip seal portion. Cap for writing instruments. A writing instrument body that contains a thermochromic ink inside and has a nib that can eject thermochromic ink at one end, and a cap that can be attached to the nib side of the writing instrument body, and the front end of the cap A nib that rubs the handwriting of the thermochromic ink and is provided with a frictional portion capable of thermally discoloring the handwriting by frictional heat generated at that time, and closes the nib front end in close contact with the nib inside the cap A thermochromic writing instrument provided with a seal part, wherein an elastic member in which a friction part and a pen point seal part are integrally formed is fixed to a front end part of a cap body. The elastic member includes a cylindrical portion having an opening at the front end and a cup-shaped portion integrally connected to the rear end of the cylindrical portion and opening rearward, and the inner surface of the cup-shaped portion is sealed with a pen tip The cup-shaped part is projected forward from the rear end of the cylindrical part, and the front end of the cup-shaped part is positioned in the cylindrical part, with the cap removed from the pen tip side of the writing instrument body, The thermochromic writing instrument according to claim 3, wherein the front end portion of the shaped portion is a friction portion. When a cap is attached to the pen tip side of the writing instrument body, the pen tip is brought into close contact with the inner surface of the cup-shaped portion, and when the cup-shaped portion is extended and deformed forward, the front end of the cup-shaped portion is the interior of the cylindrical portion. The thermochromic writing instrument according to claim 4, which is located at

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