JP6654213B2 - Thermochromic writing and friction tools - Google Patents

Description

The present invention relates to a thermochromic writing implement and a friction implement. More specifically, the present invention relates to a pen tip capable of discharging thermochromic ink, and 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. Thermochromic writing implement comprising a friction body comprising: a friction material comprising a low-wearing elastic material capable of rubbing an image or handwriting of a thermochromic ink and thermally discoloring the image or handwriting by frictional heat generated at that time. The present invention relates to a friction device having a body.

Conventionally, in this type of thermochromic writing instrument, a configuration in which a friction body is provided at a rear end of a shaft barrel or a top of a cap has been disclosed (for example, Patent Document 1).

JP 2007-223302 A

In the thermochromic writing implement of Patent Document 1, the friction body is always exposed to the outside. Therefore, when the friction body is not used, when the user's fingertip comes into contact with the friction body, or when the thermochromic writing instrument is stored and stored in a storage body (for example, a pen case, a pen stand, or a pocket of clothes). When the inner surface of the housing (for example, the inner surface of a pen case, the bottom of a pen stand, or the inner surface of a pocket of clothes) comes into contact with the friction body, hand grime and dust adhere to the surface of the friction body. If the surface is soiled, and the paper surface is rubbed using the soiled friction body, the paper surface becomes dirty.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned conventional problems, and an object of the present invention is to provide a thermochromic writing instrument and a friction instrument which can avoid contamination of a friction body when not in use.

In the present invention, “front” indicates the pen tip side, and “rear” indicates the opposite side.

The first invention of the present application is a pen tip 21 capable of discharging thermochromic ink, and a low-wear elasticity capable of rubbing a handwriting of the thermochromic ink and thermally discoloring the handwriting by frictional heat generated at that time. A thermochromic writing instrument including a friction member 3 made of a material, wherein the protection member 4 is detachably attached to the friction member side, and the protection member is attached to the friction member side in a state where the protection member 4 is attached to the friction member side. It is required that the top of the friction member 4 be located outside the top of the friction body 3.

The thermochromic writing instrument 1 of the first invention is provided with a protective member 4 detachably mounted on the friction body side, and when the protective member 4 is mounted on the friction body side, the top of the protection member 4 is By being located outside the top of the friction body 3 (i.e., outside of the friction body protrusion direction), when the friction body is not used, it comes into contact with the user's fingertip or the friction body 3 and the inner surface of the housing (for example, It is possible to avoid contact with the inner surface of the pen case, the bottom surface of the pen stand, or the inner surface of the pocket of clothes, and it is possible to prevent dirt and dust from adhering to the friction body 3 (that is, the friction body is soiled).

In the thermochromic writing implement 1 according to the first aspect of the invention, the protection member 4 may be attached to the friction body 3 directly or detachably, or may be detachably attached to a member on the friction body 3, for example. In the thermochromic writing implement 1 of the first invention, the shape of the protective member 4 may be any of a tubular shape, a plate shape, a rod shape, a plurality of projecting pieces, and the like.

According to a second invention of the present application, in the thermochromic writing instrument 1 of the first invention, the protection member 4 is cylindrical, and the protection member 4 is mounted on the friction body side. It is necessary to surround the outer peripheral surface of the friction body 3.

The thermochromic writing instrument 1 according to the second aspect of the present invention, when the friction body is not used, the user's fingertip, the friction body 3 and the inner surface of the housing (for example, the inner surface of a pen case, the bottom surface of a pen stand, or the inner surface of a pocket of clothes). And the friction body 3 can be reliably prevented from being soiled.

According to a third invention of the present application, in the thermochromic writing instrument 1 of the second invention, the inner peripheral surface of the protection member 4 and the outer peripheral surface of the friction body 3 are directly fitted detachably. Requirements.

In the thermochromic writing instrument 1 according to the third aspect, when the friction body is not used, the inner peripheral surface of the cylindrical protective member 4 and the outer peripheral surface of the friction body 3 made of a low-wear elastic material are stably fitted. The combined state can be maintained, and the protective member 4 can be prevented from being accidentally dropped from the friction body 3. An outer fitting portion is provided on an outer peripheral surface of the friction body 3, and an inner fitting portion is provided on an inner peripheral surface of the protection member 4 so as to be directly detachably fitted to the outer fitting portion. The fitting between the inner peripheral surface of the protection member 4 and the outer peripheral surface of the friction body 3 includes, for example, press-fitting, uneven fitting, screw fitting, and the like.

According to a fourth aspect of the present invention, in the thermochromic writing instrument 1 of the third aspect, when the inner peripheral surface of the protective member 4 and the outer peripheral surface of the friction body 3 are detachably fitted, the protective member is provided. It is necessary to provide a ventilation means for communicating the inside and the outside of 4.

In the thermochromic writing instrument 1 according to the fourth aspect of the present invention, when the inner peripheral surface of the protective member 4 and the outer peripheral surface of the friction body 3 are attached and detached, the inside of the protective member 4 is not pressurized and decompressed. 4 can be smoothly attached to and detached from the friction body 3.

A fifth invention of the present application is the thermochromic writing instrument 1 of the fourth invention, wherein the protective member 4 is a bottomed tubular body comprising a top wall and a tubular side wall connected to the top wall. It is required that a ventilation hole 42 is provided on the top wall or the side wall of the protection member 4 as the ventilation means.

In the thermochromic writing instrument 1 according to the fifth invention, when the inner peripheral surface of the protective member 4 and the outer peripheral surface of the friction body 3 are attached and detached, the inside and outside of the protective member 4 are separated by the ventilation holes 42. Communication can be ensured.

According to a sixth aspect of the present invention, in the thermochromic writing instrument 1 of the fourth aspect, the protective member 4 has a bottomed cylindrical body including a top wall and a cylindrical side wall connected to the top wall. In addition, a ventilation path as the ventilation means is provided between the inner peripheral surface of the side wall of the protection member 4 and the outer peripheral surface of the friction body 3.

In the thermochromic writing instrument 1 according to the sixth aspect, when the inner peripheral surface of the protective member 4 and the outer peripheral surface of the friction body 3 are attached and detached, the inside and the outside of the protective member 4 are reliably secured by the ventilation path. Can be communicated with. In the thermochromic writing instrument 1 according to the sixth aspect of the present invention, when the friction body is not used, the friction body 3 has a bottomed cylindrical shape having no ventilation holes on the top wall and the side wall, despite having ventilation means. It can be covered with the body protection member 4, preventing dust and dirt from entering the inside of the protection member 4, and further preventing the friction body 3 from being stained.

According to a seventh aspect of the present invention, in the thermochromic writing implement 1 of the first to sixth aspects, the thermochromic ink is contained inside the barrel 2, and the thermochromic ink is provided at the front end of the barrel 2. It is required that a pen tip 21 capable of discharging ink is provided, and the friction body 3 be provided at a rear end of the barrel 2.

Since the thermochromic writing instrument 1 of the seventh invention is provided with the friction body 3 at the rear end of the barrel 2, it is possible to write with the pen tip 21 while the friction body 3 is protected by the protection member 4. Only when the friction member 3 is used, the protection member 4 can be detached from the friction member 3 and used, and contamination of the friction member 3 when not in use can be avoided as much as possible.

According to an eighth invention of the present application, in the thermochromic writing implement 1 of the seventh invention, a writing body is accommodated in the barrel 2 so as to be movable in the front-rear direction, and a thermochromic ink is provided inside the writing body. A pen tip 21 that accommodates and is capable of discharging the thermochromic ink is provided at the front end of the writing body, an operating unit 22 is provided on the barrel 2, and the operating unit 22 is operated to operate the pen tip of the writing body. 21 is required to be able to protrude and retract from the front end hole of the barrel 2.

According to the thermochromic writing instrument 1 of the eighth invention, a retractable thermochromic writing instrument 1 that can avoid contamination of the friction body 3 when not in use as much as possible is obtained.

A ninth invention of the present application is the thermochromic writing instrument 1 of the seventh invention, further comprising a cap 5 detachably attached to a front outer surface and a rear outer surface of the barrel 2, A rear insertion fitting portion 51 is provided in which the inner surface of the cap 5 and the rear outer surface of the barrel 2 are fitted, and the inner diameter of the rear insertion fitting portion 51 on the inner surface of the cap 5 is formed larger than the outer diameter of the protection member 4. It is a requirement.

In the thermochromic writing instrument 1 according to the ninth aspect, the inner diameter of the rear insertion fitting portion 51 of the cap 5 is formed to be larger than the outer diameter of the protection member 4, so that the cap 5 is attached to the rear portion of the barrel 2. At this time (that is, at the time of inserting the rear of the cap), the protective member 4 does not hinder the rear insertion of the cap 5, and the cap can be smoothly mounted.

According to a tenth aspect of the present invention, in the thermochromic writing implement 1 of the first to sixth aspects, the thermochromic ink is housed inside the barrel 2 and the thermochromic ink is provided at the front end of the barrel 2. It is required that a pen tip 21 capable of discharging ink is provided, a cap 5 is detachably mounted on a front outer surface of the barrel 2, and the friction body 3 is provided on a top outer surface of the cap 5.

In the thermochromic writing instrument 1 of the tenth aspect, since the friction body 3 is provided on the top outer surface of the cap 5, the cap 5 is removed from the pen tip side, and the friction body 3 is covered with the protective member 4 while the pen tip is covered. 21, the protective member 4 can be detached from the friction body 3 and used only when the friction body 3 is used, and dirt on the friction body 3 when not in use can be avoided as much as possible.

An eleventh invention of the present application is characterized in that, in the thermochromic writing implement 1 of the first to tenth inventions, the removed protection member 4 is detachably provided on a portion other than the friction body.

The thermochromic writing instrument 1 according to the eleventh aspect can prevent the protection member 4 removed from the friction body from being lost. The portions other than the friction body include, for example, the barrel 2, the cap 5, the operation unit 22, and a clip.

According to a twelfth aspect of the present invention, there is provided a friction member provided with a friction body 3 made of a low-wear elastic material capable of rubbing an image or handwriting of a thermochromic ink and thermally discoloring the image or handwriting by frictional heat generated at the time. The inner surface of the protective member 4 made of a bottomed cylindrical body and the outer peripheral surface of the friction body 3 are detachably and directly fitted to each other, and the protection member 4 is fitted to the friction body 3. In this state, the top of the protection member 4 must be located outside the top of the friction body 3 in the closed state.

The friction device 6 according to the twelfth aspect of the present invention is configured such that when the friction member is not used, the friction member 3 comes into contact with the user's fingertip, or the friction member 3 and the inner surface of the housing (for example, the inner surface of a pen case, the bottom of a pen stand, or the inner surface of a pocket of clothes) ) Can be avoided, and it can be prevented that hand grits, dust, and the like adhere to the friction body 3 (that is, the friction body becomes dirty).

Further, in the friction device 6 of the twelfth aspect, the protection member 4 is a cylindrical body with a bottom, and when the protection member 4 is fitted to the friction body 3, the outer peripheral surface of the friction body 3 is protected by the protection member 4. Is surrounded. Thereby, when the friction body is not used, the contact between the user's fingertip or the friction body 3 and the inner surface of the housing (for example, the inner surface of the pen case, the bottom of the pen stand, or the inner surface of the pocket of the clothes) can be reliably avoided. The body 3 can be reliably prevented from being soiled.

Further, the friction tool 6 of the twelfth aspect of the invention is configured such that the inner peripheral surface of the protective member 4 formed of a bottomed cylindrical body and the outer peripheral surface of the friction body 3 are directly fitted detachably. When the friction member is not used, a stable fit between the inner peripheral surface of the protective member 4 and the outer peripheral surface of the friction member 3 made of a low-wear elastic material can be maintained. Can be prevented from falling off. The fitting between the inner peripheral surface of the protection member 4 and the outer peripheral surface of the friction body 3 includes, for example, press-fitting, uneven fitting, screw fitting, and the like.
In addition, the friction tool 6 of the present invention does not include a thermochromic ink and a pen tip from which the thermochromic ink can be discharged.

According to a thirteenth aspect of the present invention, in the friction device 6 of the twelfth aspect, when the inner peripheral surface of the protective member 4 and the outer peripheral surface of the friction body 3 are detachably fitted, the protective member 4 It is necessary to have ventilation means for communicating the inside and the outside.

In the friction tool 6 according to the thirteenth aspect, when attaching / detaching the inner peripheral surface of the protective member 4 and the outer peripheral surface of the friction body 3, the inside of the protective member 4 is not pressurized / depressurized, and the protective member 4 is removed. It can be smoothly attached to and detached from the friction body 3.

A fourteenth invention of the present application is the friction tool 6 according to the thirteenth invention, wherein the protection member 4 is a bottomed cylindrical body including a top wall and a cylindrical side wall connected to the top wall. A requirement is that a ventilation hole 42 is provided on the top wall or side wall of the protection member 4 as the ventilation means.

In the friction tool 6 according to the fourteenth aspect, when the inner peripheral surface of the protective member 4 and the outer peripheral surface of the friction body 3 are detached from each other, the inside of the protective member 4 and the outside of the protective member 4 are reliably connected by the vent holes 42. Can communicate.

A fifteenth invention of the present application is the friction tool 6 of the thirteenth invention, wherein the protection member 4 is a bottomed cylindrical body including a top wall and a cylindrical side wall connected to the top wall. A requirement is to provide a ventilation path as the ventilation means between the inner peripheral surface of the side wall of the protection member 4 and the outer peripheral surface of the friction body 3.

In the friction tool 6 according to the fifteenth aspect, when the inner peripheral surface of the protection member 4 and the outer peripheral surface of the friction body 3 are attached and detached, the inside and outside of the protection member 4 are reliably communicated by the ventilation path. Can be done. Further, in the friction tool 6 of the fifteenth aspect, when the friction body is not used, the friction body 3 is formed of a bottomed cylindrical body having no ventilation holes on the top wall and the side wall, despite having the ventilation means. It can be covered with the protection member 4 to prevent dust and dirt from entering the inside of the protection member 4 and further prevent the friction body 3 from being stained.

A sixteenth invention of the present application is characterized in that, in the friction tool 6 of the twelfth to fifteenth inventions, the removed protection member 4 is detachably provided on a portion other than the friction body.

The friction tool 6 according to the sixteenth aspect can prevent the protection member 4 removed from the friction body from being lost.

In the present invention, the elastic material constituting the friction body 3 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 synthetic resin having elasticity is not made of a highly wearable elastic material (for example, an eraser or the like), but is made of a low wearable elastic material that hardly generates wear debris (erased debris) during friction. In the present invention, the protective member 4 is preferably made of a synthetic resin (for example, polycarbonate, polyethylene, polypropylene, polyacetal, ABS resin, etc.).

In the present invention, the thermochromic ink is preferably of a type that changes color or loses color by heating.

The thermochromic writing instrument of the present invention can prevent the friction body from being stained when not in use.

ADVANTAGE OF THE INVENTION The friction tool of this invention can avoid that a friction body becomes dirty when not in use.

FIG. 2 is a partial longitudinal sectional view showing the thermochromic writing instrument according to the first embodiment of the present invention when not in use. FIG. 2 is a partial longitudinal sectional view showing the thermochromic writing instrument of FIG. 1 when writing is in use. FIG. 2 is a partial longitudinal sectional view showing the thermochromic writing instrument of FIG. 1 when a friction body is used. FIG. 9 is a partial vertical cross-sectional view illustrating a thermochromic writing instrument according to a second embodiment of the present invention when not in use. FIG. 5 is a partial vertical cross-sectional view illustrating the thermochromic writing instrument of FIG. 4 when writing is in use. FIG. 5 is a partial longitudinal sectional view showing the thermochromic writing instrument of FIG. 4 when a friction body is used. FIG. 13 is a partial vertical cross-sectional view illustrating a thermochromic writing instrument according to a third embodiment of the present invention when not in use. FIG. 8 is a vertical cross-sectional view illustrating a state in which the friction body of FIG. 7 is used. FIG. 2 is a partial longitudinal sectional view showing a first configuration of a friction body and a protection member of the present invention. FIG. 5 is a partial longitudinal sectional view showing a second configuration of the friction member and the protection member of the present invention. FIG. 10 is a partial longitudinal sectional view showing a third configuration of the friction member and the protection member of the present invention. FIG. 10 is a partial longitudinal sectional view showing a fourth configuration of the friction body and the protection member of the present invention. FIG. 11 is a partial longitudinal sectional view showing a fifth configuration of the friction body and the protection member of the present invention. It is a partial longitudinal section showing a 6th composition of a friction body and a protection member of the present invention. FIG. 14 is a partial longitudinal sectional view showing a seventh configuration of the friction member and the protection member of the present invention. FIG. 14 is a partial vertical cross-sectional view illustrating a friction tool according to a fourth embodiment of the present invention when not in use. FIG. 17 is a partial vertical cross-sectional view showing the use of the friction device of FIG. 16.

<Thermochromatic writing implement of the first embodiment>
FIGS. 1 to 3 show a thermochromic writing instrument 1 according to a first embodiment of the present invention.
The thermochromic writing instrument 1 of the present embodiment is a retractable thermochromic writing instrument.
The thermochromic writing instrument 1 according to the present embodiment includes a barrel 2, a writing body accommodated in the barrel 2 so as to be movable in the front-rear direction, and a pen tip 21 of the writing body in a front end hole of the barrel 2. The friction member 3 is provided at the rear end of the barrel 2 and the protection member 4 is detachably attached to the friction member. A thermochromic ink is accommodated inside the writing body, and a pen tip 21 capable of discharging the thermochromic ink is provided at a front end of the writing body.

In the thermochromic writing instrument 1 of the present embodiment, an operation portion 22 (clip) that can move in the front-rear direction from the rear side wall of the barrel 2 projects radially outward, and the operation portion 22 slides forward. There is provided a retracting mechanism (side slide type retracting mechanism) which allows the pen tip 21 of the writing body to be retracted from the front end hole of the barrel 2 by operating.

In addition to the above, the retracting mechanism includes a rear-end knocking type in which a pen tip is protruded and retracted by pressing an operating portion provided at the rear end of the barrel, and an operating portion protruding from the outer surface of the sidewall of the barrel. And a rotary type in which the pen tip comes out and emerges by rotating the operating part at the rear of the barrel, and the like.

A friction body 3 made of a low-wear elastic material (for example, SBS resin, SEBS resin, or silicone resin) is fixed to the rear end of the barrel 2, and the friction body 3 is positioned rearward of the rear end of the barrel 2. Protruded. The barrel 2 is made of synthetic resin or metal.

The protection member 4 is formed of a cylindrical body of a synthetic resin (for example, polycarbonate, polyethylene, polypropylene, polyacetal, ABS resin, or the like). The inner peripheral surface of the protection member 4 and the outer peripheral surface of the friction body 3 are directly fitted detachably. As a specific configuration of the friction body 3 and the protection member 4, any one of the configurations shown in FIGS. 9 to 15 is employed.

The thermochromic writing instrument 1 of the present embodiment is provided with a detachable protective member 4 that can be attached to the friction body side, and when the protective member 4 is attached to the friction body side, the top of the protective member 4 is the friction member 3. It is located outside the top. Thereby, when the friction body is not used, contact with the user's fingertip and contact between the friction body 3 and the inner surface of the housing (for example, the inner surface of the pen case, the bottom of the pen stand, or the inner surface of the pocket of the clothes) can be avoided. It is possible to prevent hand grime and dust from adhering to the friction body 3 (that is, the friction body 3 is contaminated).

Further, in the thermochromic writing instrument 1 of the present embodiment, the protection member 4 has a cylindrical shape, and the protection member 4 surrounds the outer peripheral surface of the friction body 3 in a state where the protection member 4 is mounted on the friction body side. Thereby, when the friction body is not used, the contact between the user's fingertip or the friction body 3 and the inner surface of the housing (for example, the inner surface of the pen case, the bottom of the pen stand, or the inner surface of the pocket of the clothes) can be reliably avoided. The body 3 can be reliably prevented from being soiled.

In addition, the thermochromic writing instrument 1 of the present embodiment is configured such that the inner peripheral surface of the protective member 4 and the outer peripheral surface of the friction body 3 are detachably and directly fitted to each other, so that the cylindrical body can be used when the friction body is not used. Can maintain a stable fit between the inner peripheral surface of the protective member 4 and the outer peripheral surface of the friction body 3 made of a low-wear elastic material, and prevent the protection member 4 from accidentally falling off the friction body 3. Can be prevented. The fitting between the inner peripheral surface of the protection member 4 and the outer peripheral surface of the friction body 3 includes, for example, press-fitting (FIG. 9), uneven fitting (FIG. 10), and screw fitting (FIG. 11). Can be

Further, since the thermochromic writing instrument 1 of the present embodiment includes the friction body 3 at the rear end of the barrel 2, it is possible to write with the pen tip 21 in a state where the friction body 3 is covered with the protection member 4, Only when the friction body 3 is used, the protection member 4 can be detached from the friction body 3 and used, and contamination of the friction body 3 when not in use can be avoided as much as possible.

Further, in the thermochromic writing instrument 1 of the present embodiment, the protection member 4 removed from the friction body 3 is provided detachably on a portion other than the friction body (for example, a shaft cylinder, an operation unit, a clip). In the present embodiment, specifically, the frictional body locking portion 23 is provided on the side wall of the barrel 2, and the frictional body 3 is temporarily locked to the frictional body locking portion 23 when the frictional body is used. You. Thereby, loss of the protection member 4 removed from the friction body side can be prevented.

<Thermochromatic writing implement of the second embodiment>
4 to 6 show a thermochromic writing instrument 1 according to a second embodiment of the present invention.
The thermochromic writing instrument 1 of the present embodiment is a cap-type thermochromic writing instrument.
The thermochromic writing implement 1 of the present embodiment includes a barrel 2 containing thermochromic ink therein, a pen tip 21 provided at a front end of the barrel 2 and capable of discharging the thermochromic ink, A friction member 3 provided at the rear end of the barrel 2, a cap 5 detachably attached to the pen tip side of the barrel 2, and a protection member 4 detachably attached to the friction body side. Become.

A friction body 3 made of a low-wear elastic material (for example, SBS resin, SEBS resin, or silicone resin) is fixed to the rear end of the barrel 2, and the friction body 3 is positioned rearward of the rear end of the barrel 2. Protruded. The barrel 2 is made of synthetic resin or metal.

The protection member 4 is formed of a cylindrical body of a synthetic resin (for example, polycarbonate, polyethylene, polypropylene, polyacetal, ABS resin, or the like). The inner peripheral surface of the protection member 4 and the outer peripheral surface of the friction body 3 are directly fitted detachably. In addition, as a specific configuration of the friction member 3 and the protection member 4, any one of the configurations shown in FIGS. 9 to 15 is employed.

The thermochromic writing instrument 1 of the present embodiment is provided with a detachable protective member 4 that can be attached to the friction body side, and when the protective member 4 is attached to the friction body side, the top of the protective member 4 is the friction member 3. It is located outside the top. Thereby, when the friction body is not used, contact with the user's fingertip and contact between the friction body 3 and the inner surface of the housing (for example, the inner surface of the pen case, the bottom of the pen stand, or the inner surface of the pocket of the clothes) can be avoided. It is possible to prevent hand grime and dust from adhering to the friction body 3 (that is, the friction body 3 is contaminated).

Further, in the thermochromic writing instrument 1 of the present embodiment, the protection member 4 has a cylindrical shape, and the protection member 4 surrounds the outer peripheral surface of the friction body 3 in a state where the protection member 4 is mounted on the friction body side. Thereby, when the friction body is not used, the contact between the user's fingertip or the friction body 3 and the inner surface of the housing (for example, the inner surface of the pen case, the bottom of the pen stand, or the inner surface of the pocket of the clothes) can be reliably avoided. The body 3 can be reliably prevented from being soiled.

In addition, the thermochromic writing instrument 1 of the present embodiment is configured such that the inner peripheral surface of the protective member 4 and the outer peripheral surface of the friction body 3 are detachably and directly fitted to each other, so that the cylindrical body can be used when the friction body is not used. Can maintain a stable fit between the inner peripheral surface of the protective member 4 and the outer peripheral surface of the friction body 3 made of a low-wear elastic material, and prevent the protection member 4 from accidentally falling off the friction body 3. Can be prevented. The fitting between the inner peripheral surface of the protection member 4 and the outer peripheral surface of the friction body 3 includes, for example, press-fitting (FIG. 9), uneven fitting (FIG. 10), and screw fitting (FIG. 11). Can be

Further, since the thermochromic writing instrument 1 of the present embodiment includes the friction body 3 at the rear end of the barrel 2, it is possible to write with the pen tip 21 in a state where the friction body 3 is covered with the protection member 4, Only when the friction body 3 is used, the protection member 4 can be detached from the friction body 3 and used, and contamination of the friction body 3 when not in use can be avoided as much as possible.

Further, the thermochromic writing instrument 1 of the present embodiment includes a cap 5 which is detachably attached to a front outer surface and a rear outer surface of the barrel 2, and the inner surface of the cap 5, the inner surface of the cap 5, and the shaft A rear insertion fitting portion 51 that fits with the rear outer surface of the cylinder 2 is provided, and the inner diameter of the rear insertion fitting portion 51 on the inner surface of the cap 5 is formed larger than the outer diameter of the protection member 4. Accordingly, when the cap 5 is mounted on the rear part of the barrel 2 (that is, when the cap is inserted rearward), the protective member 4 does not hinder the rear insertion of the cap 5, and the cap can be mounted smoothly.

Further, in the thermochromic writing instrument 1 of the present embodiment, the protection member 4 removed from the friction body 3 is provided detachably on a portion other than the friction body (for example, a barrel, a cap, a clip). In the present embodiment, specifically, a frictional body locking portion 53 is provided at the top of the cap 5, and the frictional body 3 is temporarily locked to the frictional body locking portion 53 when the frictional body is used. . Thereby, loss of the protection member 4 removed from the friction body side can be prevented.

<Thermochromic writing implement of the third embodiment>
7 and 8 show a thermochromic writing instrument 1 according to a third embodiment of the present invention.
The thermochromic writing instrument 1 of the present embodiment is a cap-type thermochromic writing instrument.
The thermochromic writing implement 1 of the present embodiment includes a barrel 2 containing thermochromic ink therein, a pen tip 21 provided at a front end of the barrel 2 and capable of discharging the thermochromic ink, The cap 5 includes a cap 5 that can be mounted on the pen tip side of the barrel 2, and a protection member 4 that is fixed to the top of the cap 5 and that is removably mounted on the friction body side.

On the top of the cap 5, a friction body 3 made of a low-wear elastic material (for example, SBS resin, SEBS resin, or silicone resin) is fixed to a friction body holding section 52 on the top of the cap 5, and the friction body 3 is It protrudes outward from the friction body holding portion 52. The outer surface of the top wall of the friction body 3 is flat, and the outer surface of the side wall of the friction body 3 is straight (straight cylindrical) or tapered, and the space between the top wall of the friction body 3 and the side wall of the friction body 3 is: They are connected by a convex curved outer surface. The planar outer surface of the top wall and the convexly curved outer surface between the top wall and the side wall of the friction body 3 constitute the friction portion 31 that rubs the handwriting of the thermochromic ink on the paper. The barrel 2 is made of synthetic resin or metal.

The protection member 4 is formed of a cylindrical body of a synthetic resin (for example, polycarbonate, polyethylene, polypropylene, polyacetal, ABS resin, or the like).

The mounting structure of the protection member 4 and the friction member 3 is configured such that the inner peripheral surface of the protection member 4 and the outer peripheral surface of the friction member holding portion 52 are removably fitted. A structure in which the inner peripheral surface and the outer peripheral surface of the friction body 3 are directly fitted detachably, or the inner peripheral surface of the protection member 4 and the outer peripheral surface of the friction body holding portion 52 are detachably fitted. In addition, the inner peripheral surface of the protection member 4 and the outer peripheral surface of the friction body 3 are directly detachably fitted. The fitting between the inner peripheral surface of the protection member 4 and the outer peripheral surface of the friction body holding portion 52 and the fitting between the inner peripheral surface of the protection member 4 and the outer peripheral surface of the friction body 3 are performed, for example, by press-fitting. (FIG. 9), uneven fitting (FIG. 10), screw fitting (FIG. 11), and the like.

Further, when the inner peripheral surface of the protection member 4 and the outer peripheral surface of the friction body 3 are detachably fitted to each other, ventilation means for communicating the inside and the outside of the protection member 4 (for example, FIGS. 12 to 15). Configuration) can also be provided.

The thermochromic writing instrument 1 of the present embodiment is provided with a detachable protective member 4 that can be attached to the friction body side, and when the protective member 4 is attached to the friction body side, the top of the protective member 4 is the friction member 3. It is located outside the top. Thereby, when the friction body is not used, contact with the user's fingertip and contact between the friction body 3 and the inner surface of the housing (for example, the inner surface of the pen case, the bottom of the pen stand, or the inner surface of the pocket of the clothes) can be avoided. It is possible to prevent hand grime and dust from adhering to the friction body 3 (that is, the friction body 3 is contaminated).

Further, in the thermochromic writing instrument 1 of the present embodiment, the protection member 4 has a cylindrical shape, and the protection member 4 surrounds the outer peripheral surface of the friction body 3 in a state where the protection member 4 is mounted on the friction body side. Thereby, when the friction body is not used, the contact between the user's fingertip or the friction body 3 and the inner surface of the housing (for example, the inner surface of the pen case, the bottom of the pen stand, or the inner surface of the pocket of the clothes) can be reliably avoided. The body 3 can be reliably prevented from being soiled.

Further, the thermochromic writing instrument 1 of the present embodiment has a cylindrical shape when the friction member is not used, when the inner peripheral surface of the protective member 4 and the outer peripheral surface of the friction member 3 are directly fitted detachably. A stable fit between the inner peripheral surface of the protection member 4 and the outer peripheral surface of the friction body 3 made of a low-wear elastic material can be maintained, thereby preventing the protection member 4 from accidentally falling off the friction body 3. it can.

In addition, the thermochromic writing instrument 1 of the present embodiment contains a thermochromic ink inside the barrel 2, and a pen tip 21 capable of discharging the thermochromic ink is provided at a front end of the barrel 2. By providing a cap 5 detachably attached to the front outer surface of the barrel 2 and providing the friction body 3 on the top outer surface of the cap 5, the cap 5 is removed from the pen tip side, and the friction body 3 is removed. Can be written with the pen tip 21 in a state of being covered with the protection member 4, the protection member 4 can be removed from the friction body 3 and used only when the friction body 3 is used, and the dirt on the friction body 3 when not in use is removed. Avoid as much as possible.

Further, in the thermochromic writing instrument 1 of the present embodiment, the protection member 4 removed from the friction body 3 is provided detachably on a portion other than the friction body (for example, a barrel, a cap, a clip). In the present embodiment, specifically, a frictional body locking portion 23 is provided at the rear end of the barrel 2, and the frictional body 3 is temporarily locked to the frictional body locking portion 23 when a frictional body is used. Is done. Thereby, loss of the protection member 4 removed from the friction body side can be prevented.

<Friction Tool of Fourth Embodiment>
16 and 17 show a friction device 6 according to a fourth embodiment of the present invention.
The friction device 6 according to the present embodiment includes a main body 7, a friction body 3 provided at one end of the main body 7, and a protection member 4 that is detachably fitted to the friction body 3.

A friction body 3 made of a low-wear elastic material (for example, SBS resin, SEBS resin, or silicone resin) is fixed to one end of the main body 7, and the friction body 3 protrudes outward from one end of the main body 7. You. The main body 7 is formed of a synthetic resin or metal. The shape of the main body 7 may be any shape such as a columnar shape, a cylindrical shape, a rod shape, etc., as long as it can be gripped.

The protective member 4 is formed of a bottomed cylindrical body made of a synthetic resin (for example, polycarbonate, polyethylene, polypropylene, polyacetal, ABS resin, etc.). The inner peripheral surface of the protection member 4 and the outer peripheral surface of the friction body 3 are directly fitted detachably. As a specific configuration of the friction body 3 and the protection member 4, any one of the configurations shown in FIGS. 9 to 15 is employed.

The friction device 6 according to the present embodiment includes the friction body 3 made of a low-wear elastic material capable of rubbing an image or handwriting of the thermochromic ink and thermally discoloring the image or handwriting by frictional heat generated at that time. A friction member 6, wherein the inner peripheral surface of a protective member 4 made of a bottomed cylindrical body and the outer peripheral surface of the friction member 3 are directly fitted detachably, and the protective member 4 is fitted to the friction member 3. In the combined state, the top of the protection member 4 is located outside the top of the friction body 3. Thereby, when the friction body is not used, contact with the user's fingertip and contact between the friction body 3 and the inner surface of the housing (for example, the inner surface of a pen case, the bottom surface of a pen stand, or the inner surface of a pocket of clothes) can be avoided. It is possible to prevent hand grime, dust, and the like from adhering to the friction body 3 (that is, the friction body is soiled).

Further, in the friction device 6 of the present embodiment, the top and outer periphery of the friction body 3 are protected by the protection member 4 when the protection member 4 is formed of a bottomed cylindrical body and the protection member 4 is fitted to the friction body 3. The face is surrounded. Thereby, when the friction body is not used, the contact between the user's fingertip or the friction body 3 and the inner surface of the housing (for example, the inner surface of the pen case, the bottom surface of the pen stand, or the inner surface of the pocket of the clothes) can be reliably avoided. The body 3 can be reliably prevented from being soiled.

Further, the friction member 6 of the present embodiment is configured such that the inner peripheral surface of the protective member 4 formed of a bottomed cylindrical body and the outer peripheral surface of the friction member 3 are directly fitted in a detachable manner, thereby providing a friction member. When not in use, a stable fit between the inner peripheral surface of the cylindrical protective member 4 and the outer peripheral surface of the friction body 3 made of a low-wear elastic material can be maintained. It can be prevented from falling off easily. The fitting between the inner peripheral surface of the protection member 4 and the outer peripheral surface of the friction body 3 includes, for example, press-fitting (FIG. 9), uneven fitting (FIG. 10), and screw fitting (FIG. 11). Can be
In addition, the friction tool 6 of the present invention does not double as a thermochromic writing instrument, does not include the thermochromic ink in the main body 7, and does not include a pen tip capable of discharging the thermochromic ink at the end of the main body 7. .

Further, in the friction device 6 of the present embodiment, the protection member 4 removed from the friction body 3 is provided detachably on a portion other than the friction body (for example, the other end of the main body 7, the side wall of the main body 7). In the present embodiment, specifically, a frictional body engaging portion 71 is provided at the other end of the main body 7, and the frictional body 3 is temporarily engaged with the frictional body engaging portion 71 when the frictional body is used. You. Thereby, loss of the protection member 4 removed from the friction body side can be prevented.

<First Configuration of Friction Body and Protection Member>
FIG. 9 shows a first configuration of the friction body 3 and the protection member 4. This configuration is adopted for the thermochromic writing instrument 1 of the first to third embodiments and the friction tool 6 of the fourth embodiment.
A friction portion 31 is formed on the outer surface of the top wall of the friction body 3 for rubbing the handwriting of the thermochromic ink on the paper. An outer fitting portion 32 to be fitted with the protection member 4 is formed on the outer peripheral surface of the side wall of the friction portion 31. The outer surface of the top wall (friction portion 31) of the friction body 3 is a convex curved surface, and the outer peripheral surface of the side wall of the friction body 3 is straight (straight cylindrical) or tapered.

The protection member 4 is a bottomed cylindrical body (for example, a bottomed cylindrical body) having an opening at one end composed of a top wall and a cylindrical side wall connected to the top wall. On the inner peripheral surface of the side wall of the protection member 4, an inner fitting portion 41 that can be directly fitted to the outer fitting portion 32 of the friction body 3 is formed.

The outer fitting portion 32 of the friction body 3 has a straight outer surface, the inner fitting portion 41 of the protection member 4 has a straight inner surface, and the outer fitting portion 32 of the friction body 3 and the protection member have the same shape. 4 and the inner fitting portion 41 is press-fitted so as to be detachable. A step 8 is formed inside the friction body 3 (ie, on the side opposite to the direction in which the friction body 3 protrudes), and the outer fitting section 32 of the friction body 3 and the inner fitting section 41 of the protection member 4 are formed. Is press-fitted, the step 8 and the opening end of the protection member 4 or the step 8 and the inner wall of the protection member 4 come into contact with each other. The step 8 is formed on the barrel 2 or the friction body 3 in the case of the thermochromic writing implement 1, and is formed on the main body 7 or the friction body 3 in the case of the friction implement 6.

<Second Configuration of Friction Body and Protection Member>
FIG. 10 shows a second configuration of the friction body 3 and the protection member 4. This configuration is adopted for the thermochromic writing instrument 1 of the first to third embodiments and the friction tool 6 of the fourth embodiment.
A friction portion 31 is formed on the outer surface of the top wall of the friction body 3 for rubbing the handwriting of the thermochromic ink on the paper. An outer fitting portion 32 to be fitted with the protection member 4 is formed on the outer peripheral surface of the side wall of the friction portion 31. The outer surface of the top wall (friction portion 31) of the friction body 3 is a convex curved surface, and the outer peripheral surface of the side wall of the friction body 3 is straight (straight cylindrical) or tapered.

The protection member 4 is a bottomed cylindrical body (for example, a bottomed cylindrical body) having an opening at one end composed of a top wall and a cylindrical side wall connected to the top wall. On the inner peripheral surface of the side wall of the protection member 4, an inner fitting portion 41 that can be directly fitted to the outer fitting portion 32 of the friction body 3 is formed.

The outer fitting portion 32 of the friction body 3 includes an outward projection (for example, an annular projection or a plurality of projection groups), and the inner fitting portion 41 of the protection member 4 has an inward projection (for example, an annular projection or a plurality of projections). The outer fitting portion 32 of the friction body 3 and the inner fitting portion 41 of the protection member 4 are detachably fitted to each other (so-called over-fitting). A step 8 is formed inside the friction body 3 (ie, on the side opposite to the direction in which the friction body 3 protrudes), and the outer fitting section 32 of the friction body 3 and the inner fitting section 41 of the protection member 4 are formed. When the concave and convex are fitted, the step 8 and the opening end of the protection member 4 or the step 8 and the inner wall of the protection member 4 come into contact with each other. The step 8 is formed on the barrel 2 or the friction body 3 in the case of the thermochromic writing implement 1, and is formed on the main body 7 or the friction body 3 in the case of the friction implement 6.

<Third Configuration of Friction Body and Protection Member>
FIG. 11 shows a third configuration of the friction body 3 and the protection member 4. This configuration is adopted for the thermochromic writing instrument 1 of the first to third embodiments and the friction tool 6 of the fourth embodiment.
A friction portion 31 is formed on the outer surface of the top wall of the friction body 3 for rubbing the handwriting of the thermochromic ink on the paper. An outer fitting portion 32 to be fitted with the protection member 4 is formed on the outer peripheral surface of the side wall of the friction portion 31. The outer surface of the top wall (friction portion 31) of the friction body 3 is a convex curved surface, and the outer peripheral surface of the side wall of the friction body 3 is straight (straight cylindrical) or tapered.

The protection member 4 is a bottomed cylindrical body (for example, a bottomed cylindrical body) having an opening at one end composed of a top wall and a cylindrical side wall connected to the top wall. On the inner peripheral surface of the side wall of the protection member 4, an inner fitting portion 41 that can be directly fitted to the outer fitting portion 32 of the friction body 3 is formed.

The outer fitting portion 32 of the friction body 3 is formed of a male screw portion, the inner fitting portion 41 of the protection member 4 is formed of a female thread portion, and the outer fitting portion 32 of the friction body 3 and the inside of the protection member 4 are fitted. The fitting portion 41 is detachably screw-fitted (that is, screwed). A step 8 is formed inside the friction body 3 (ie, on the side opposite to the direction in which the friction body 3 protrudes), and the outer fitting section 32 of the friction body 3 and the inner fitting section 41 of the protection member 4 are formed. When the screw is fitted, the step 8 and the opening end of the protection member 4 or the step 8 and the inner wall of the protection member 4 come into contact with each other. The step 8 is formed on the barrel 2 or the friction body 3 in the case of the thermochromic writing implement 1, and is formed on the main body 7 or the friction body 3 in the case of the friction implement 6.

<Fourth Configuration of Friction Body and Protection Member>
FIG. 12 shows a fourth configuration of the friction body 3 and the protection member 4. This configuration is adopted for the thermochromic writing instrument 1 of the first to third embodiments and the friction tool 6 of the fourth embodiment.
A friction portion 31 is formed on the outer surface of the top wall of the friction body 3 for rubbing the handwriting of the thermochromic ink on the paper. An outer fitting portion 32 to be fitted with the protection member 4 is formed on the outer peripheral surface of the side wall of the friction portion 31. The outer surface of the top wall (friction portion 31) of the friction body 3 is a convex curved surface, and the outer peripheral surface of the side wall of the friction body 3 is straight (straight cylindrical) or tapered.

The protection member 4 is a bottomed cylindrical body (for example, a bottomed cylindrical body) composed of a top wall and a cylindrical side wall connected to the top wall. On the inner peripheral surface of the side wall of the protection member 4, an inner fitting portion 41 that can be directly fitted to the outer fitting portion 32 of the friction body 3 is formed.

The outer fitting portion 32 of the friction body 3 has a straight outer surface (straight cylindrical outer surface), and the inner fitting portion 41 of the protection member 4 has a straight inner surface (right cylindrical inner surface). The outer fitting portion 32 of the body 3 and the inner fitting portion 41 of the protection member 4 are press-fitted to be detachable. In this configuration, as the fitting structure, in addition to the press-fitting (FIG. 9), a concave-convex fitting (FIG. 10) and a screw fitting (FIG. 11) can also be adopted. A step 8 is formed inside the friction body 3 (ie, on the side opposite to the direction in which the friction body 3 protrudes), and the outer fitting section 32 of the friction body 3 and the inner fitting section 41 of the protection member 4 are formed. Is fitted, the step 8 and the opening end of the protection member 4 or the step 8 and the inner wall of the protection member 4 are in contact with each other. The step 8 is formed on the barrel 2 or the friction body 3 in the case of the thermochromic writing implement 1, and is formed on the main body 7 or the friction body 3 in the case of the friction implement 6.

The protection member 4 is a bottomed cylindrical body having one end opened by a top wall and a cylindrical side wall connected to the top wall, and the top wall and / or the side wall of the protection member 4 includes: A ventilation hole 42 is formed as the ventilation means. When attaching / detaching the inner peripheral surface of the protection member 4 and the outer peripheral surface of the friction body 3, the inside of the protection member 4 can be reliably communicated with the outside by the ventilation hole 42. Thereby, when attaching and detaching the inner peripheral surface of the protection member 4 and the outer peripheral surface of the friction body 3, the protection member 4 is smoothly attached to and detached from the friction body 3 without pressurizing and depressurizing the inside of the protection member 4. be able to.

<Fifth Configuration of Friction Body and Protection Member>
FIG. 13 shows a fifth configuration of the friction body 3 and the protection member 4. This configuration is adopted for the thermochromic writing instrument 1 of the first to third embodiments and the friction tool 6 of the fourth embodiment.
A friction portion 31 is formed on the outer surface of the top wall of the friction body 3 for rubbing the handwriting of the thermochromic ink on the paper. An outer fitting portion 32 to be fitted with the protection member 4 is formed on the outer peripheral surface of the side wall of the friction portion 31. The outer surface of the top wall (friction portion 31) of the friction body 3 has a convex curved surface, and the outer peripheral surface of the side wall of the friction body 3 has a straight shape (straight cylindrical shape) or a tapered shape.

The protection member 4 is a bottomed cylindrical body (for example, a bottomed cylindrical body) including a cylindrical side wall having both ends opened. On the inner peripheral surface of the side wall of the protection member 4, an inner fitting portion 41 that can be directly fitted to the outer fitting portion 32 of the friction body 3 is formed.

The outer fitting portion 32 of the friction body 3 has a straight outer surface (straight cylindrical outer surface), and the inner fitting portion 41 of the protection member 4 has a straight inner surface (right cylindrical inner surface). The outer fitting portion 32 of the body 3 and the inner fitting portion 41 of the protection member 4 are press-fitted to be detachable. The protection member 4 can be fitted to the friction body 3 from either opening side. In this configuration, as the fitting structure, in addition to the press-fitting (FIG. 9), a concave-convex fitting (FIG. 10) and a screw fitting (FIG. 11) can also be adopted. A step 8 is formed inside the friction body 3 (ie, on the side opposite to the direction in which the friction body 3 protrudes), and the outer fitting section 32 of the friction body 3 and the inner fitting section 41 of the protection member 4 are formed. Is fitted, the step 8 and the opening end of the protection member 4 or the step 8 and the inner wall of the protection member 4 are in contact with each other. The step 8 is formed on the barrel 2 or the friction body 3 in the case of the thermochromic writing implement 1, and is formed on the main body 7 or the friction body 3 in the case of the friction implement 6.

When the protection member 4 is fitted to the friction body 3, a top portion is opened and a ventilation hole 42 as ventilation means is formed. When attaching / detaching the inner peripheral surface of the protection member 4 and the outer peripheral surface of the friction body 3, the inside of the protection member 4 can be reliably communicated with the outside by the ventilation hole 42. Thereby, when attaching and detaching the inner peripheral surface of the protection member 4 and the outer peripheral surface of the friction body 3, the protection member 4 is smoothly attached to and detached from the friction body 3 without pressurizing and depressurizing the inside of the protection member 4. be able to.

<Sixth Configuration of Friction Body and Protection Member>
FIG. 14 shows a sixth configuration of the friction body 3 and the protection member 4. This configuration is adopted for the thermochromic writing instrument 1 of the first to third embodiments and the friction tool 6 of the fourth embodiment.
A friction portion 31 is formed on the outer surface of the top wall of the friction body 3 for rubbing the handwriting of the thermochromic ink on the paper. An outer fitting portion 32 to be fitted with the protection member 4 is formed on the outer peripheral surface of the side wall of the friction portion 31. The outer surface of the top wall (friction portion 31) of the friction body 3 has a convex curved surface, and the outer peripheral surface of the side wall of the friction body 3 has a straight shape (straight cylindrical shape) or a tapered shape.

The protection member 4 is a bottomed cylindrical body (for example, a bottomed cylindrical body) composed of a top wall and a cylindrical side wall connected to the top wall. On the inner peripheral surface of the side wall of the protection member 4, an inner fitting portion 41 that can be directly fitted to the outer fitting portion 32 of the friction body 3 is formed.

The outer fitting portion 32 of the friction body 3 has a straight outer surface (straight cylindrical outer surface), and the inner fitting portion 41 of the protection member 4 has a straight inner surface (right cylindrical inner surface). The outer fitting portion 32 of the friction body 3 and the inner fitting portion 41 of the protection member 4 are press-fitted to be detachable. In this configuration, as the fitting structure, in addition to the press-fitting (FIG. 9), a concave-convex fitting (FIG. 10) and a screw fitting (FIG. 11) can also be adopted. A step 8 is formed inside the friction body 3 (ie, on the side opposite to the direction in which the friction body 3 protrudes), and the outer fitting section 32 of the friction body 3 and the inner fitting section 41 of the protection member 4 are formed. Is fitted, the step 8 and the opening end of the protection member 4 or the step 8 and the inner wall of the protection member 4 are in contact with each other. The step 8 is formed on the barrel 2 or the friction body 3 in the case of the thermochromic writing implement 1, and is formed on the main body 7 or the friction body 3 in the case of the friction implement 6.

An axial groove or ridge 43 is formed in the inner fitting portion 41 of the protection member 4. Thereby, a ventilation path as the ventilation means is formed between the inner peripheral surface of the side wall of the protection member 4 and the outer peripheral surface of the friction body 3. When the inner peripheral surface of the protection member 4 and the outer peripheral surface of the friction body 3 are attached and detached, the inside of the protection member 4 and the outside can be reliably communicated by the ventilation path. As a result, when attaching / detaching the inner peripheral surface of the protection member 4 and the outer peripheral surface of the friction body 3, the protection member 4 is smoothly attached / detached to / from the friction body 3 without pressurizing and depressurizing the inside of the protection member 4. be able to.

In addition, in the present configuration, when the friction body is not used, the friction body 3 can be covered with the bottomed cylindrical protection member 4 having no ventilation hole on the top wall or the side wall despite having the ventilation means. As a result, it is possible to prevent dust and dirt from entering the inside of the protection member 4 and further prevent the friction body 3 from being stained.

<Seventh Configuration of Friction Body and Protection Member>
FIG. 15 shows a seventh configuration of the friction body 3 and the protection member 4. This configuration is adopted for the thermochromic writing instrument 1 of the first to third embodiments and the friction tool 6 of the fourth embodiment.
A friction portion 31 is formed on the outer surface of the top wall of the friction body 3 for rubbing the handwriting of the thermochromic ink on the paper. An outer fitting portion 32 to be fitted with the protection member 4 is formed on the outer peripheral surface of the side wall of the friction portion 31. The outer surface of the top wall (friction portion 31) of the friction body 3 has a convex curved surface, and the outer peripheral surface of the side wall of the friction body 3 has a straight shape (straight cylindrical shape) or a tapered shape.

The protection member 4 is a bottomed cylindrical body (for example, a bottomed cylindrical body) composed of a top wall and a cylindrical side wall connected to the top wall. On the inner peripheral surface of the side wall of the protection member 4, an inner fitting portion 41 that can be directly fitted to the outer fitting portion 32 of the friction body 3 is formed.

The outer fitting portion 32 of the friction body 3 has a straight outer surface (straight cylindrical outer surface), and the inner fitting portion 41 of the protection member 4 has a straight inner surface (right cylindrical inner surface). The outer fitting portion 32 of the friction body 3 and the inner fitting portion 41 of the protection member 4 are press-fitted to be detachable. In this configuration, as the fitting structure, in addition to the press-fitting (FIG. 9), a concave-convex fitting (FIG. 10) and a screw fitting (FIG. 11) can also be adopted. A step 8 is formed inside the friction body 3 (ie, on the side opposite to the direction in which the friction body 3 protrudes), and the outer fitting section 32 of the friction body 3 and the inner fitting section 41 of the protection member 4 are formed. Is fitted, the step 8 and the opening end of the protection member 4 or the step 8 and the inner wall of the protection member 4 are in contact with each other. The step 8 is formed on the barrel 2 or the friction body 3 in the case of the thermochromic writing implement 1, and is formed on the main body 7 or the friction body 3 in the case of the friction implement 6.

An axial groove or ridge 33 is formed in the outer fitting portion 32 of the friction body 3. Thereby, a ventilation path as the ventilation means is formed between the inner peripheral surface of the side wall of the protection member 4 and the outer peripheral surface of the friction body 3. When the inner peripheral surface of the protection member 4 and the outer peripheral surface of the friction body 3 are attached and detached, the inside of the protection member 4 and the outside can be reliably communicated by the ventilation path. As a result, when attaching / detaching the inner peripheral surface of the protection member 4 and the outer peripheral surface of the friction body 3, the protection member 4 is smoothly attached / detached to / from the friction body 3 without pressurizing and depressurizing the inside of the protection member 4. be able to.

In addition, in the present configuration, when the friction body is not used, the friction body 3 can be covered with the bottomed cylindrical protection member 4 having no ventilation hole on the top wall or the side wall despite having the ventilation means. As a result, it is possible to prevent dust and dirt from entering the inside of the protection member 4 and further prevent the friction body 3 from being stained.

DESCRIPTION OF SYMBOLS 1 Thermochromic writing implement 2 Shaft cylinder 21 Nib 22 Operating part 23 Friction body locking part 3 Friction body 31 Friction part 32 Outer fitting part 33 Groove or ridge (air passage)
4 Protective member 41 Inner fitting part 42 Vent hole 43 Groove or ridge (air passage)
5 Cap 51 Rear insertion fitting part 52 Friction body holding part 53 Friction body locking part 6 Friction tool 7 Main body 71 Friction body locking part 8 Step

Claims (11)

A pen tip capable of discharging the 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 thermochromic ink is accommodated inside a barrel, and the pen tip capable of discharging the thermochromic ink is provided at a front end of the barrel, and a front outer surface of the barrel is provided. And a cap detachably attached to a rear outer surface, a rear insertion fitting portion is provided on the inner surface of the cap, wherein the inner surface of the cap and a rear outer surface of the barrel are fitted, and the friction is provided at a rear end of the barrel. A body is provided, and a protection member attachable to the friction body side is detachably provided, an inner diameter of a rear insertion fitting portion of the inner surface of the cap is formed larger than an outer diameter of the protection member, and the protection member is provided on the friction body side. In the mounted state, the top of the protection member It is located outside the top of the friction body, and in a state where the protection member is removed from the friction body side, the removed protection member is detachably provided on a side wall or a clip of the barrel. Thermochromic writing implement. A pen tip capable of discharging the 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, in which a cursive body is accommodated in a barrel so as to be movable in the front-rear direction, the thermochromic ink is housed inside the cursive body, and the thermochromic ink is provided at a front end of the cursive body. The pen tip capable of discharging is provided, an operating part is provided on the barrel, and the pen tip of the writing body is configured to be able to protrude and retract from a front end hole of the barrel by operating the operating part, and the friction is provided. A protection member detachably provided on the body side is provided, and a friction member locking portion capable of temporarily locking the protection member detached from the friction member is provided, wherein the friction member locking portion is in the vicinity of the friction member. A projection provided radially outwardly on the side wall of the shaft cylinder. In the state of mounting the protective member to the friction side, the top of the protection member is located outward from the top portion of the friction body, in a state in which the protective member is removed from the friction member side, it was removed A thermochromic writing instrument, wherein the protection member is detachably provided on the frictional body locking portion . The thermochromic writing instrument according to claim 1, wherein the protection member has a cylindrical shape, and the protection member surrounds an outer peripheral surface of the friction body when the protection member is mounted on the friction body. 4. The thermochromic writing implement according to claim 3, wherein an inner peripheral surface of the protection member and an outer peripheral surface of the friction body are directly fitted detachably. 5. The thermochromic writing implement according to claim 4, further comprising a ventilation means communicating between the inside and the outside of the protective member when the inner peripheral surface of the protective member and the outer peripheral surface of the friction body are detachably fitted. The protection member is a bottomed cylindrical body including a top wall and a cylindrical side wall connected to the top wall, and a ventilation hole as the ventilation means is provided on the top wall or the side wall of the protection member. The thermochromic writing implement according to claim 5. The protection member is a bottomed cylindrical body including a top wall and a cylindrical side wall connected to the top wall, and a gap between an inner peripheral surface of the side wall of the protective member and an outer peripheral surface of the friction body. 6. The thermochromic writing implement according to claim 5, further comprising a ventilation path as said ventilation means. A friction tool comprising a friction body made of a low-wear elastic material capable of thermally discoloring the image or the handwriting by frictional heat generated by rubbing the image or the handwriting of the thermochromic ink, wherein the friction tool is , A main body, the friction body provided at one end of the main body, and a protection member detachably attached to the friction body side, and a top portion of the protection member in a state where the protection member is mounted on the friction body side. Is located outside the top of the friction body, and in a state where the protection member is removed from the friction body side, the removed protection member is detachably provided on a side wall of the main body. Utensils. 9. The friction tool according to claim 8, further comprising ventilation means for communicating between the inside and the outside of the protective member when the inner peripheral surface of the protective member and the outer peripheral surface of the friction body are detachably fitted. The protection member is a bottomed cylindrical body including a top wall and a cylindrical side wall connected to the top wall, and a ventilation hole as the ventilation means is provided on the top wall or the side wall of the protection member. The friction device according to claim 9. The protection member is a bottomed cylindrical body including a top wall and a cylindrical side wall connected to the top wall, and a gap between an inner peripheral surface of the side wall of the protective member and an outer peripheral surface of the friction body. The friction tool according to claim 10, further comprising a ventilation path as said ventilation means.

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