JP2023029592A - friction tool - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a friction tool which can reduce a manufacturing cost of a thermochromic solid writing body to a low cost, and which can prevent a surface of a friction part and a paper surface from becoming dirty due to shavings of the thermochromic solid writing body during a friction operation.

SOLUTION: A friction tool 1 is used for rubbing a thermochromic handwriting obtained by a thermochromic solid writing body, so that the handwriting can be thermally discolored by frictional heat generated at that time, and includes: a lead cutting part 2 for tapering a tip of the thermochromic solid writing body; and a friction part 3 for rubbing the thermochromic handwriting. The lead cutting part 2 including: a main body 21; a tapered insertion hole 22 which is formed in the main body 21 and into which the tip of the thermochromic solid writing body can be inserted; a slit 23 communicating with a part of the insertion hole 22 and opening to outside; and a cutting blade 24 fixed to the main body 21 so as to be exposed in the slit 23. The friction part 3 is provided on an outer surface of the main body 21.

SELECTED DRAWING: Figure 1

COPYRIGHT: (C)2023,JPO&INPIT

Description

The present invention relates to friction tools. More particularly, it relates to a friction implement capable of thermally discoloring a thermochromic handwriting obtained by a thermochromic solid writing body by friction.

Patent Literature 1 discloses a thermochromic solid writing element having a friction member fixed to its rear end.

US Pat. No. 6,200,000 discloses a pencil cap with an eraser and sharpener.

JP 2015-51615 Japanese Utility Model Laid-Open No. 47-17732

In the thermochromic solid writing element of Patent Document 1, since the friction member is fixed to the rear end of each thermochromic solid writing element, the manufacturing cost of the thermochromic solid writing element alone increases.

The cap of Patent Document 2 may stain the surface of the eraser and the paper surface with pencil shavings when the eraser is used.

SUMMARY OF THE INVENTION It is an object of the present invention to solve the conventional problems described above, and to provide a friction tool capable of reducing the manufacturing cost of a single thermochromic solid writing material.
Another object of the present invention is to provide a friction tool that can avoid contamination of the surface of the friction part and the surface of paper with shavings of the thermochromic solid writing material during the friction operation.

A first invention of the present application is a friction implement capable of thermally discoloring the handwriting by rubbing a thermochromic handwriting obtained by a thermochromic solid writing body and generating frictional heat at that time, wherein the heat discoloring property A core shaving portion 2 for shaving the tip of a solid writing body in a tapered shape, and a friction portion 3 for rubbing the thermochromic handwriting, wherein the lead shaving portion 2 is composed of a main body 21 and the main body 21. a tapered insertion hole 22 into which the tip of the thermochromic solid writing body can be inserted; a slit 23 that communicates with a part of the insertion hole 22 and opens outward; and a cutting edge 24 fixed to the main body 21 so as to be exposed, and the friction part 3 is provided on the outer surface of the main body 21 .

The friction tool 1 of the first invention does not need to provide the friction part 3 on each thermochromic solid writing body due to the above configuration, and the manufacturing cost of the thermochromic solid writing body itself can be kept low. .

The second invention of the present application is the friction tool 1 of the first invention, wherein the friction portion 3 is provided on the outer surface of the main body 21 on the side opposite to the opening side of the insertion hole 22 .

In the friction tool 1 of the second invention, the friction part 3 is provided on the outer surface of the main body 21 on the side opposite to the opening side of the insertion hole 22, so that when the friction part 3 is used for the frictional operation, heat discoloration occurs. It is possible to prevent the shavings of the hard writing material from falling outside from the insertion hole 22 and to avoid staining the surface of the friction part 3 and the paper surface.

A third invention of the present application is the friction tool 1 according to the first or second invention, wherein the friction portion 3 is provided on the outer surface of the main body 21 on the side opposite to the opening side of the slit 23 of the core shaved portion 2. is required.

In the friction tool 1 of the third invention, the friction part 3 is provided on the outer surface of the main body 21 opposite to the opening side of the slit 23 of the core cutting part 2, so that the friction part 3 is used for the friction operation. In this case, it can be used with the slit 23 facing upward, preventing the shavings of the thermochromic solid writing material from falling outside through the slit 23, and preventing the surface of the friction part 3 and the paper from being soiled.

A fourth invention of the present application is a friction implement capable of thermally discoloring the handwriting by rubbing a thermochromic handwriting obtained by a thermochromic solid writing body and generating frictional heat at that time, wherein the heat discoloring property It comprises a core shaving part 2 for sharpening the tip of a solid writing body in a tapered shape and a friction part 3 for rubbing a heat-discoloring handwriting, wherein the lead shaving part 2 comprises a main body 21 and the main body 21. A tapered insertion hole 22 that is formed and into which the tip of the thermochromic solid writing body can be inserted, a slit 23 that communicates with a part of the insertion hole 22 and is opened outward, and the slit 23 is exposed. A cutting edge 24 fixed to the main body 21 so as to allow the main body 21 of the core shaving part 2 to be accommodated therein. It is required that the portion 5 is detachably provided, the main body 21 of the core cutting portion 2 is attached to the inner surface of the lid portion 5, and the friction portion 3 is provided on the outer surface of the lid portion 5 or the outer surface of the case 4. and

The friction tool 1 of the fourth aspect of the present invention does not need to provide the friction part 3 on each thermochromic solid writing body due to the above configuration, and the manufacturing cost of the thermochromic solid writing body itself can be kept low. .
Further, in the friction tool 1 of the fourth aspect of the invention, when the friction portion 3 is used for the friction operation, there is no fear that shavings of the thermochromic solid writing material will leak out from the case 4, and the surface of the friction portion 3 will not leak out. and the paper surface can be avoided.

A fifth invention of the present application is a friction implement 1 capable of thermally discoloring the handwriting by rubbing a thermochromic handwriting obtained by a thermochromic solid writing body and generating frictional heat during the frictional heat discoloration. A core shaving portion 2 for sharpening the tip portion of the thermodiscoloring solid writing body into a tapered shape, a cap portion 8 detachable from the tip portion of the thermodiscoloring solid writing piece, and a friction portion for rubbing the thermodiscoloring handwriting. 3, the core shaving portion 2 includes a main body 21, a tapered insertion hole 22 formed in the main body 21 into which the tip of the thermochromic solid writing body can be inserted, and the insertion hole 22. A slit 23 which is partially communicated and opened outward, and a cutting blade 24 fixed to the main body 21 so as to be exposed to the slit 23 , and the cap portion 8 is attached to the core shaving portion 2 . It is provided at the end of the main body 21 opposite to the opening side of the insertion hole 22 , and the friction portion 3 is provided on the outer surface of the cap portion 8 .

The friction tool 1 of the fifth invention prevents the shavings of thermochromic solid writing from falling outside from the core shaving part 2 when the frictional operation is performed using the friction part 3. It is possible to avoid contamination of the surface of the friction portion 3 and the surface of the paper.

In the friction tool 1 of the sixth invention of the present application, in the friction tool 1 of the fifth invention, the friction portion 3 is provided on the outer surface of the cap portion 8 on the side opposite to the opening side of the slit 23 of the core shaved portion 2. required to be

The friction tool 1 of the sixth invention can be used with the slit 23 facing upward when performing a friction operation using the friction part 3, so that the shavings of the thermochromic solid writing material do not fall out of the slit 23. Therefore, it is possible to prevent the surface of the friction portion 3 and the paper surface from being soiled.

Friction portion In the present invention, the friction portion 3 is made of, for example, a synthetic resin (rubber, elastomer) having elasticity, such as silicone resin, SBS resin (styrene-butadiene-styrene copolymer), SEBS resin ( styrene-ethylene-butadiene-styrene copolymer), fluorine-based resins, chloroprene resins, nitrile resins, polyester-based resins, olefin-based resins, ethylene propylene diene rubber (EPDM), and the like. The friction portion 3 is made of a low-wear elastic material that does not generate abrasion debris during friction, rather than a high-wear elastic material (eg, an eraser, etc.).

The friction tool of the present invention eliminates the need to provide a friction portion on each thermochromic solid writing body, and can reduce the manufacturing cost of a single thermochromic solid writing body.

The friction tool of the present invention can avoid contamination of the surface of the friction part and the surface of the paper with shavings of the thermochromic solid writing material during the friction operation.

1 is a perspective view of a first embodiment of the invention; FIG. FIG. 2 is a front view of FIG. 1; FIG. 2 is a rear view of FIG. 1; FIG. 3 is a perspective view of a second embodiment of the invention; FIG. 5 is a rear view of FIG. 4; It is a perspective view of the insertion hole opening state of the 3rd Embodiment of this invention. FIG. 7 is a cross-sectional view of the case and lid in a state where the insertion hole in FIG. 6 is closed; It is a perspective view of the insertion hole opening state of the 4th Embodiment of this invention. FIG. 9 is a cross-sectional view of the case and lid in a state where the insertion hole in FIG. 8 is closed; FIG. 11 is a perspective view of a fifth embodiment of the present invention; FIG. 11 is a partial cross-sectional view of FIG. 10; FIG. 12 is a cross-sectional view taken along the line AA of FIG. 11; It is a partial sectional view of the 6th Embodiment of this invention. FIG. 14 is a cross-sectional view taken along line BB of FIG. 13; It is a partial cross-sectional view of the 7th Embodiment of this invention. FIG. 16 is a cross-sectional view taken along line CC of FIG. 15;

<First Embodiment>
A first embodiment of the present invention is shown in FIGS. 1 to 3. FIG.
A friction tool 1 of the present embodiment includes a core shaving portion 2 and a friction portion 3 .

Core Shaving Part The core shaving part 2 is composed of a main body 21, an insertion hole 22 formed in the main body 21 into which the tip of the thermochromic solid writing material can be inserted, and the insertion hole 22 formed in the main body 21. It has a slit 23 open to the outside and a cutting edge 24 fixed to the main body 21 so as to be exposed to the slit 23 . The core shaving portion 2 can shave the tip of the thermochromic solid writing to sharpen the rounded tip of the thermochromic solid writing again.

The main body 21 of the core shaving portion 2 is made of synthetic resin (eg, polyacetal, polystyrene, polycarbonate, polypropylene, ABS resin, etc.) or metal (eg, aluminum, brass, etc.). The main body 21 of the core shaving portion 2 is made of a hexahedron as a whole. When the top wall portion 26 of the main body 21 of the core cutting portion 2 is directed upward, the height from the bottom wall portion 28 to the top wall portion 26 gradually increases from the opening side of the insertion hole 22 toward the closing side of the insertion hole 22. It is formed in a tapered shape that decreases in height. In the main body 21 of the core cutting portion 2, the area of the side wall portion on the insertion hole 22 closing side is smaller than the area of the side wall portion on the insertion hole 22 opening side. The shape of the main body 21 of the core scraping portion 2 may be a rectangular parallelepiped.

The inner surface of the insertion hole 22 is formed in a conical shape. A slit 23 extending in the insertion direction of the thermochromic solid writing body is formed on the outer surface of the main body 21 , and the slit 23 opens the insertion hole 22 to the outside from the outer surface of the main body 21 . The slit 23 is formed in the ceiling wall portion 26 of the main body 2 . The slit 23 is formed in the ceiling wall portion 26 of the main body 21 .

The cutting edge 24 is fixed to the top wall portion 26 of the main body 21 with a mounting screw 25 . The cutting edge 24 is arranged along the slit 23 so that its edge portion is exposed to the slit 23 .

· Friction Part The friction part 3 is provided on the outer surface of the main body 21 . The friction portion 3 is provided at the end of the main body 21 opposite to the opening of the insertion hole 22 and the end of the main body 21 opposite to the opening of the slit 23 of the main body 21 (the end of the bottom wall portion 28 of the main body). The friction portion 3 is provided in a straight line, and includes two corners obtained by intersecting four planes (three side wall portions 27 and a bottom wall portion 28) of the main body 21 and two planes (insertion hole) of the main body 21. It has a shape in which a side wall portion 27 on the opposite side of 22 and a ridge line portion obtained by intersecting the bottom wall portion 28) are integrally connected.

The friction portion 3 is made of elastic synthetic resin (for example, SEBS resin). The friction part 3 is fixed to the main body 21 of the core cutting part 2 by fitting, screwing, adhesion, etc., or is integrally fixed to the main body 21 of the core cutting part 2 made of synthetic resin by two-color molding. , a configuration in which the main body 21 of the core shaved portion 2 is provided by coating, or a configuration in which the core shaved portion 2 is entirely formed of the same material as the friction portion 3 .

・Gripping part On the outer surface of the facing side wall part 27 extending in the insertion direction of the solid writing body of the top wall part 26 of the main body 21 of the core sharpening part 2 and straddling the cutting edge 24, a gripping part 29 that can be gripped during frictional operation is formed. be done. It is preferable that the grip portion 29 is formed in a concave curved surface so that fingers can easily fit it. In addition, the surface of the grip portion 29 may be formed with fine irregularities for anti-slip purposes, or may be made of an elastic material.

The friction implement 1 of the present embodiment includes a core scraping portion 2 for scraping the tip of a thermochromic solid writing body in a tapered shape, and a friction portion 3 for rubbing the thermochromic handwriting. The part 2 includes a main body 21, a tapered insertion hole 22 formed in the main body 21 and into which the tip of the thermochromic solid writing body can be inserted, and a part of the insertion hole 22 communicating with and opening outward. and a cutting blade 24 fixed to the main body 21 so as to be exposed to the slit 23, and the friction part 3 is provided on the outer surface of the main body 21, so that each thermochromic solid writing There is no need to provide the friction part 3 on the body, and the production cost of the thermochromic solid longhand alone can be kept low.

In the friction implement 1 of the present embodiment, the friction portion 3 is provided on the outer surface of the main body 21 on the side opposite to the opening side of the insertion hole 22, so that when the friction portion 3 is used for the friction operation, the heat-discoloring solid writing is Shavings from the body can be prevented from falling outside from the insertion hole 22, and the surface of the friction portion 3 and the paper can be prevented from being soiled.

In the friction tool 1 of the present embodiment, the friction part 3 is provided on the outer surface of the main body 21 on the side opposite to the opening side of the slit 23 of the core shaving part 2 . 23 can be used in an upward-facing state, shavings of the thermochromic solid writing material can be prevented from falling outside through the slit 23, and contamination of the surface of the friction part 3 and paper can be avoided.

<Second Embodiment>
A second embodiment of the invention is shown in FIGS.
The friction tool 1 of the present embodiment is a modification of the first embodiment, and differs from the first embodiment in the structure of the friction part 3, and the rest of the structure and operational effects are the same as those of the first embodiment. It is common with morphology.

· Friction Part The friction part 3 is provided on the outer surface of the main body 21 . The friction portion 3 is provided at the end of the main body 21 opposite to the opening of the insertion hole 22 and the end of the main body 21 opposite to the opening of the slit 23 of the main body 21 . The friction portions 3 are formed only at two corner portions obtained by intersecting four planes (three side wall portions 27 and a bottom wall portion 28) of the main body 21. As shown in FIG. Thereby, an increase in the material cost of the friction portion 3 can be suppressed.

Moreover, the top (corner) of the friction portion 3 is formed in a convex curved shape, thereby enabling smooth friction operation with the paper surface.

<Third Embodiment>
A third embodiment of the invention is shown in FIGS.
A friction tool 1 of the present embodiment includes a core shaving portion 2, a case 4, a lid portion 5, and a friction portion 3. When the lid portion 5 is closed, the friction tool 1 has a rectangular parallelepiped shape as a whole.

・Cord Shaving Part The core shaving part 2 includes a main body 21, an insertion hole 22 formed in the main body 21 into which the tip of the thermochromic solid writing material can be inserted, and an insertion hole 22 formed in the main body 21 which is outside. It has a slit 23 open to the outside and a cutting blade 24 fixed to the main body 21 so as to be exposed to the slit 23 . The main body 21 has a shape similar to that of the first embodiment, and when the top wall portion 26 is turned upward, the height from the bottom wall portion 28 to the top wall portion 21 is approximately the same as the opening side of the insertion hole 22. It is formed in a tapered shape in which the height gradually decreases toward the closing side of the insertion hole 22 . The core shaving portion 2 can shave the tip of the thermochromic solid writing to sharpen the rounded tip of the thermochromic solid writing again.

- Case The case 4 is a box-shaped container with a rectangular cross section, one end of which is open and the other end of which is closed. The lead shaving part 2 is accommodated in the case 4, and shavings generated at the tip of the thermochromic solid writing body when the tip of the thermochromic solid writing body is shaved can be accommodated. The case 4 is made of a transparent synthetic resin (for example, polycarbonate), so that the inside of the case 4 can be visually recognized from the outside.

·Lid portion The lid portion 5 is integrally formed of an elastic synthetic resin (for example, SEBS resin). The lid portion 5 has an inner lid 6 and an outer lid 7 integrally connected by a hinge 51 . The lid portion 5 has a rectangular cross section when the inner lid 6 and the outer lid 7 are assembled. The outer surface of the lid portion 5 (the outer surface of the outer lid 7 ) serves as the friction portion 3 .

Inner Lid The inner lid 6 includes a quadrangular top wall portion 61 and four side wall portions 62 that are continuously arranged so as to cover the periphery of the top wall portion 61 . A quadrangular ring-shaped inner projection 63 is formed on the inner surface of the top wall portion 61 of the inner lid 6, and the inner surface of the inner projection 63 is detachably press-fitted to the outer surface of the main body 21 of the core cutting portion 2. As shown in FIG. A rectangular ring-shaped outer projection 64 is formed on the outer surface of the top wall portion 61 of the inner lid 6 , and the inner surface of the side wall portion 62 of the outer lid 7 is detachably fitted to the outer surface of the outer projection 64 . The inner surface of the side wall portion 62 of the inner lid 6 is detachably fitted to the outer surface of the opening of the case 4 . The ceiling wall portion 61 of the inner lid 6 is provided with a communication hole 65 that communicates with the insertion hole 22 of the core scraping portion 2 .

Outer Lid The outer lid 7 includes a quadrangular top wall portion 71 and four side wall portions 72 that are continuously arranged so as to cover the periphery of the top wall portion 71 . The inner surface of the side wall portion 72 of the outer lid 7 is detachably fitted to the square annular outer projection 64 on the outer surface of the top wall portion 61 of the inner lid 6 . The four ridges where the top wall 71 of the outer lid 7 and the four peripheral walls intersect and the four corners at the intersections of the four ridges are formed into convex curved surfaces, thereby providing friction during frictional operation. , smooth friction with the paper surface is possible.

The friction implement 1 of the present embodiment includes a core scraping portion 2 for scraping the tip of a thermochromic solid writing body in a tapered shape, and a friction portion 3 for rubbing the thermochromic handwriting. The part 2 includes a main body 21, a tapered insertion hole 22 formed in the main body 21 and into which the tip of the thermochromic solid writing body can be inserted, and a part of the insertion hole 22 communicating with and opening outward. and a cutting edge 24 fixed to the main body 21 so as to be exposed to the slit 23, and a case 4 for storing shavings that can accommodate the main body 21 of the core shaving part 2 is provided, A lid portion 5 for closing the opening of the case 4 is detachably provided. , the need to provide the friction part 3 on each thermochromic solid writing body is eliminated, and the manufacturing cost of the thermochromic solid writing body alone can be kept low.

In addition, in the friction implement 1 of the present embodiment, when the friction portion 3 is used for the friction operation with the insertion hole 22 closed, shavings of the thermochromic solid writing material leak out of the case 4. It is possible to prevent the surface of the friction part 3 and the paper from being soiled without fear.

<Fourth Embodiment>
A fourth embodiment of the invention is shown in FIGS.
The friction tool 1 of the present embodiment is a modification of the third embodiment, and differs from the third embodiment in the structure of the friction portion 3, and the rest of the structure and effects are those of the third embodiment. Common with morphology.

The friction part 3 is provided at the bottom (closed end) of the case 4 . Specifically, in the case 4, the friction portions 3 are formed at four ridgeline portions where the bottom wall portion and the four side wall portions are connected, and four corner portions where the ridgeline portions intersect. The friction portion 3 is formed in a convex curved shape at the ridge and corner portions of the bottom portion of the case 4, thereby enabling smooth friction operation with the paper surface. The friction portion 3 is made of elastic synthetic resin (for example, SEBS resin). The friction portion 3 may be fixed to the case 4 by fitting, screwing, adhesion, or the like, integrally fixed to the case 4 by two-color molding, provided to the case 4 by coating, or the entire case 4. is made of the same material as the friction portion 3 .

In this embodiment, the inner lid 6 is made of synthetic resin (eg, polyethylene, polypropylene, etc.). Alternatively, the inner lid 6 may be made of elastic synthetic resin (for example, SEBS resin) as in the third embodiment.

The friction tool 1 of the present embodiment is provided with the friction part 3 at the bottom of the case 4, so that even when the insertion hole 22 is open, it can be used with the insertion hole 22 facing upward, and the shavings inside the insertion hole 22 can be removed. Friction operation can be performed using the friction portion 3 without leaking out. At that time, the side wall portion of the case 4 becomes the grip portion.

<Fifth Embodiment>
A fourth embodiment of the present invention is shown in FIGS. 10-11.
A friction tool 1 of the present embodiment includes a core shaving portion 2 , a cap portion 8 and a friction portion 3 .

・Cord Shaving Part The core shaving part 2 includes a main body 21, an insertion hole 22 formed in the main body 21 into which the tip of the thermochromic solid writing material can be inserted, and an insertion hole 22 formed in the main body 21 which is outside. It has a slit 23 open to the outside and a cutting blade 24 fixed to the main body 21 so as to be exposed to the slit 23 . The main body 21 has a cuboid shape.
The core shaving portion 2 can shave the tip of the thermochromic solid writing to sharpen the rounded tip of the thermochromic solid writing again.

· Cap portion The cap portion 8 is formed of a cylindrical body with a bottom, one end of which is open and the other end of which is closed. The closing side of the cap portion 8 is integrally connected to the main body 21 of the core shaving portion 2 . The opening of the cap portion 8 is opened on the opposite side of the insertion hole 22 . The tip of the thermochromic solid writing body is detachably attached to the inner surface of the cap portion 8 . A friction portion 3 is provided on the outer surface of the cap portion 8 . The outer surface of the cap portion 8 serves as a grip portion 81 during frictional operation.

· Friction Part The friction part 3 is formed in an annular shape on the outer surface of the open end of the cap part 8 . A flat portion or a concave portion is formed on the outer surface of the friction portion 3 at a position aligned with the side surface of the core cut portion 2 . In addition, the friction portion 3 is aligned with the extension surface of the side surface of the main body 21 or inside the extension surface of the side surface of the main body 21 so as not to protrude outward from the extension surface of the side surface of the main body 21 of the core cutting portion 2 . located towards As a result, the friction tool 1 can be placed stably on the desk. Further, the surface of the friction portion 3 is formed in a convex curved shape, thereby enabling smooth friction operation with the paper surface.

The friction portion 3 is made of elastic synthetic resin (for example, SEBS resin). The friction portion 3 is fixed to the cap portion 8 by fitting, screwing, adhesion, or the like, is integrally fixed to the cap portion 8 by two-color molding, is provided on the cap portion 8 by coating, or is cap A configuration in which the entire portion 8 is made of the same material as the friction portion 3 may be used.

The friction implement 1 of the present embodiment comprises a core shaving portion 2 for sharpening the tip portion of the thermochromic solid writing material in a tapered shape, and a cap portion 8 detachable from the tip portion of the thermochromic solid writing material. and a friction part 3 for rubbing the thermodiscoloring handwriting, wherein the core shaving part 2 comprises a main body 21 and a tip part of the thermodiscoloring solid writing material formed in the main body 21 can be inserted. A tapered insertion hole 22, a slit 23 communicating with a part of the insertion hole 22 and opening outward, and a cutting edge 24 fixed to the main body 21 so as to be exposed in the slit 23. The cap portion 8 is provided at the end of the main body 21 on the side opposite to the opening side of the insertion hole 22 of the core shaving portion 2, and the friction portion 3 is provided on the outer surface of the cap portion 8. When the friction operation is performed using the part 3, it is possible to prevent the shavings of the thermochromic solid writing material from falling outside from the sharpening part 2, thereby avoiding the surface of the friction part 3 and the paper surface from being soiled.

In the friction tool 1 of the present embodiment, the friction part 3 is provided on the outer surface of the cap part 8 on the side opposite to the opening side of the slit 23 of the core shaving part 2, so that when the friction part 3 is used for the friction operation, Shavings of the thermochromic solid writing material are prevented from falling to the outside through the slit 23, and contamination of the surface of the friction part 3 and the surface of the paper can be avoided.

<Sixth Embodiment>
A sixth embodiment of the invention is shown in FIGS.
The friction tool 1 of the present embodiment is a modification of the fifth embodiment, and differs from the fifth embodiment in the shape of the friction portion 3, and the rest of the configuration and operational effects are those of the fifth embodiment. Common with morphology.

The friction portion 3 is provided in a semicircular shape on the outer surface of the cap portion 8 on the side opposite to the opening side of the slit 23 of the core scraping portion 2 .

<Seventh Embodiment>
A seventh embodiment of the invention is shown in FIGS.
The friction tool 1 of the present embodiment is a modification of the fifth embodiment, and differs from the fifth embodiment in the shape of the friction portion 3, and the rest of the configuration and operational effects are those of the fifth embodiment. Common with morphology.

The friction portion 3 is provided on the outer surface of the cap portion 8 on the side opposite to the opening side of the slit 23 of the core shaving portion 2, and the circumferential length of the friction portion 3 is set to 1/6 to 1/2 of the entire circumference of the cap portion 8. be done.

Reference Signs List 1 Friction tool 2 Lead cutting portion 21 Main body 22 Insertion hole 23 Slit 24 Cutting edge 25 Mounting screw 26 Top wall portion 27 Side wall portion 28 Bottom wall portion 29 Grip portion 3 Friction portion 4 Case 5 Lid portion 51 Hinge 6 Inner lid 61 Top wall Part 62 Side wall part 63 Inner protrusion 64 Outer protrusion 65 Communication hole 7 Outer lid 71 Ceiling wall part 72 Side wall part 8 Cap part 81 Grip part 9 Thermochromic solid longhand

Claims (2)

A friction tool capable of thermally discoloring the handwriting by rubbing the thermochromic handwriting obtained from the thermochromic solid writing material and generating frictional heat at that time,
Equipped with a core shaving portion for sharpening the tip of the thermochromic solid writing body in a tapered shape, and a friction portion for rubbing the thermochromic handwriting,
The core shaving portion includes a main body, a tapered insertion hole formed in the main body into which the tip portion of the thermochromic solid writing body can be inserted, and a part of the insertion hole that communicates with and opens outward. and a cutting edge fixed to the main body so as to be exposed to the slit,
The friction portion is linearly provided on the outer surface of the main body on the side opposite to the opening side of the insertion hole and on the outer surface of the main body on the side opposite to the opening side of the slit of the core cutting portion,
The friction portion has only a shape in which two corner portions obtained by intersecting the two outer surfaces and one ridge portion obtained by intersecting the two outer surfaces are integrally connected. Characterized friction tool. A friction tool capable of thermally discoloring the handwriting by rubbing the thermochromic handwriting obtained from the thermochromic solid writing material and generating frictional heat at that time,
Equipped with a core shaving portion for sharpening the tip of the thermochromic solid writing body in a tapered shape, and a friction portion for rubbing the thermochromic handwriting,
The core shaving portion includes a main body, a tapered insertion hole formed in the main body into which the tip portion of the thermochromic solid writing body can be inserted, and a part of the insertion hole that communicates with and opens outward. and a cutting edge fixed to the main body so as to be exposed to the slit,
The friction portion is provided on the outer surface of the main body on the side opposite to the opening side of the insertion hole and on the outer surface of the main body on the side opposite to the opening side of the slit of the core cutting portion,
The friction tool, wherein the friction parts are formed only at two corners obtained by intersecting the two outer surfaces.

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