Friction tool and thermochromic writing instrument

Abstract

To provide a friction tool which enables the periphery of a friction portion on a writing surface to be clearly visually recognized during friction operation and can reliably and easily thermally discolor only a part to be thermally discolored, and a thermochromic writing instrument provided with the friction tool.SOLUTION: A friction tool includes a friction portion 21 and a base 3 on which the friction portion 21 is provided and which is made of a transparent material. The friction portion 21 is provided so as to protrude downward from the lower surface of the base 3 and to be continuously surrounded by the base 3 in an annular shape. During a friction operation, the lower surface of the base 3 is opposed to the writing surface, and the writing surface is visible from above the base 3 through the base 3 (see-through portion 32) around the friction portion 21. The upper surface of the base 3 is visible through a see-through portion 41 of a grip portion 4.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present invention relates to a friction tool and a thermochromic writing instrument. More specifically, the present invention relates to a friction tool that can rub a thermochromic image or handwriting on a surface to be written on and thermochromic the thermochromic image or handwriting with the frictional heat generated during the friction, and a thermochromic writing instrument equipped with the friction tool. [Background technology]

[0002] Conventionally, Patent Document 1 discloses a configuration in which a friction body has a see-through part on the side thereof and a friction part made of an elastic material on the outer surface of the top of the see-through part. Patent Document 2 discloses an eraser that includes an erasing part for erasing handwriting and a visible part near the erasing part that allows the writing surface to be seen. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2013-95013 A [Patent Document 2] JP 2014-177053 A Summary of the Invention [Problem to be solved by the invention]

[0004] The friction body of Patent Document 1 is configured so that, during frictional operation, the opposite side can be viewed from the viewing side through the see-through part on the side; however, the orientation of the see-through part needs to be properly aligned with the viewing side, and depending on the orientation in which the see-through part is viewed, the friction part and the periphery of the friction point on the writing surface may be seen to overlap, which may prevent the periphery of the friction point from being clearly visible.

[0005] In Patent Document 2, the eraser disclosed in Figures 1 and 2 may cause the erased portion and the periphery of the erased portion to be seen overlapping when erasing, while the eraser disclosed in Figures 3 to 6 may cause the entire periphery of the erased portion to be seen in a uniform manner when erasing, since the entire periphery of the erased portion is seen both directly and through the visible portion. In other words, the periphery of the erased portion may not be seen clearly.

[0006] The present invention is intended to solve the above-mentioned problems of the conventional art, and aims to provide a friction device that allows the surroundings of the frictioned area on the writing surface to be clearly visible during friction operation, and that can reliably and easily thermally discolor only the area that is desired to be thermally discolored, and a thermochromic writing instrument equipped with the same. [Means for solving the problem]

[0007] The first invention of the present application is a friction device having a friction part that can rub a thermochromic image or handwriting on a surface to be written on and can thermochromic the thermochromic image or handwriting with frictional heat generated during the friction, the friction device comprising the friction part and a base made of a transparent material on which the friction part is provided, the friction part is provided so as to protrude downward from a lower surface of the base and to be continuously surrounded by the base in an annular shape, the lower surface of the base is opposed to the surface to be written on during a friction operation, and the surface to be written on is visible from above the base through the base around the friction part. It is.

[0008] The friction device of the first invention allows the surroundings of the frictioned portion on the writing surface to be clearly visible during frictional operation, and allows only the desired portion to be thermally discolored to be thermally discolored reliably and easily.

[0009] A second invention of the present application is a friction device according to the first invention, further comprising a cylindrical gripping portion made of a transparent material and disposed above a base surrounding the friction portion, wherein an upper surface of the base can be seen through the gripping portion from outside the base, and wherein, during frictional operation, a lower surface of the base is opposed to a surface to be written on, and the surface to be written on can be seen through the gripping portion and the base surrounding the friction portion.

[0010] In the friction tool of the second invention, even when the grip part is gripped during frictional operation, the upper surface of the base can be seen through the grip part between the fingers holding the grip part from a diagonal direction slightly radially above the axial upper side of the base. As a result, the surroundings of the frictioned part on the writing surface can be clearly seen during frictional operation, and only the part to be thermally discolored can be thermally discolored reliably and easily.

[0011] A third invention of the present application is a friction device according to the first invention, further comprising a gripping portion composed of opposing side walls protruding upward from a base surrounding the friction portion, a window hole communicating the outside and inside of the gripping portion is formed between the opposing side walls of the gripping portion, an upper surface of the base is configured to be visible through the window hole from the outside of the gripping portion, and a lower surface of the base is opposed to a surface to be written on during frictional operation, and the surface to be written on is configured to be visible through the window hole and the base surrounding the friction portion.

[0012] In the friction tool of the third invention, even when the grip part is gripped during frictional operation, the upper surface of the base can be seen through a window between the fingers holding the grip part from a diagonal direction slightly radially above the axial direction of the base. As a result, the surroundings of the frictioned part on the writing surface can be clearly seen during frictional operation, and only the part to be thermally discolored can be thermally discolored reliably and easily.

[0013] A fourth invention of the present application is a friction tool according to the first invention, further comprising a gripping portion provided laterally from the base, an upper surface of the base being exposed, and, during use for friction, a lower surface of the base is opposed to a surface to be written on, so that the upper surface of the base can be directly seen from the outside.

[0014] In the friction tool of the fourth invention, the upper surface of the base can be directly seen during frictional operation even when the gripping part is being gripped. As a result, the surroundings of the frictioned part on the writing surface can be clearly seen during frictional operation, and only the part to be thermally discolored can be reliably and easily thermally discolored.

[0015] The fifth invention of the present application is a thermochromic writing instrument comprising a barrel containing thermochromic ink therein, a pen tip provided at the upper end of the barrel and capable of ejecting the thermochromic ink, and a friction part provided at the lower end of the barrel, the friction part rubbing the handwriting made of the thermochromic ink on a writing surface and capable of thermochromically changing the color of the handwriting by the frictional heat generated at that time, the lower end of the barrel comprising a base part provided with the friction part and made of a transparent material, the friction part being This thermochromic writing instrument is characterized in that it has a cylindrical gripping portion that protrudes downward from the underside of a base and is continuously surrounded by the base in a ring shape, is disposed above the base around the friction portion and is made of a transparent material, the upper surface of the base is configured to be visible through the gripping portion from outside the base, and during friction operation, the underside of the base is faced against a surface to be written on, and the surface to be written on is configured to be visible through the gripping portion and the base around the friction portion.

[0016] In the thermochromic writing implement of the fifth invention, even when the grip part is gripped during frictional operation, the upper surface of the base can be seen through the grip part between the fingers holding the grip part from a diagonal direction slightly radially above the axial direction of the base. As a result, the surroundings of the frictioned part on the writing surface can be clearly seen during frictional operation, and only the part to be thermally discolored can be reliably and easily thermally discolored.

[0017] The sixth invention of the present application is a thermochromic writing instrument comprising a barrel containing thermochromic ink therein, a pen tip provided at the upper end of the barrel and capable of ejecting the thermochromic ink, and a friction part provided at the lower end of the barrel, the friction part rubbing a mark made of the thermochromic ink on a writing surface and capable of thermochromically changing the color of the mark by the frictional heat generated at that time, the lower end of the barrel comprising a base provided with the friction part and made of a transparent material, the friction part protruding below the lower surface of the base and the This thermochromic writing instrument is characterized in that it comprises a gripping portion that is continuously surrounded by a base in an annular shape and has opposing side wall portions that protrude upward from the base around the friction portion, a window hole that connects the outside and inside of the gripping portion is formed between the opposing side wall portions of the gripping portion, the upper surface of the base is configured to be visible through the window hole from the outside of the gripping portion, and during friction operation, the lower surface of the base is faced against a surface to be written on, and the surface to be written on is configured to be visible through the window hole and the base around the friction portion.

[0018] In the thermochromic writing implement of the sixth invention, the upper surface of the base can be seen through a window between the fingers holding the grip part from a diagonal direction slightly radially above the axial direction of the base, even when the grip part is being held during frictional operation. As a result, the surroundings of the frictioned part on the writing surface can be clearly seen during frictional operation, and only the part to be thermally discolored can be thermally discolored reliably and easily.

[0019] The seventh invention of the present application is a thermochromic writing instrument comprising a barrel containing thermochromic ink therein, a pen tip provided at one end of the barrel and capable of ejecting the thermochromic ink, a cap detachably provided on the pen tip side of the barrel, and a friction part provided at a lower end of the cap, the friction part rubs a handwriting made of the thermochromic ink on a writing surface and is capable of thermochromically changing the color of the handwriting by frictional heat generated at that time, the lower end of the cap is provided with a base made of a transparent material and the friction part is provided, the friction part is provided so as to protrude downward from the lower surface of the base and be continuously surrounded by the base in an annular shape, the cap is provided with a tubular handle part provided above the base around the friction part and made of a transparent material, the upper surface of the base can be seen through the handle part from the outside of the handle part, This is a thermochromic writing instrument characterized in that, during friction operation, the underside of the base is opposed to the surface to be written on, and the surface to be written on is visible through the base around the gripping portion and the friction portion.

[0020] In the thermochromic writing implement of the seventh invention, even when the cap is removed from the barrel and the grip of the cap is gripped during frictional operation, the upper surface of the base can be seen through the grip between the fingers holding the grip from a diagonal direction slightly radially away from the axially upper side of the grip. As a result, the area around the friction point on the writing surface can be clearly seen during frictional operation, and only the part to be thermally discolored can be thermally discolored reliably and easily. Effect of the Invention

[0021] The friction tool of the present invention allows the surroundings of the frictioned portion on the writing surface to be clearly visible during frictional operation, and allows only the desired portion to be thermally discolored reliably and easily.

[0022] When the thermochromic writing implement of the present invention is rubbed, the area around the rubbed part on the writing surface can be clearly seen, and only the part to be thermally discolored can be reliably and easily thermally discolored. [Brief description of the drawings]

[0023] [Figure 1] FIG. 1 is a front view of a first embodiment of the present invention. [Diagram 2] FIG. 2 is a vertical cross-sectional view of FIG. [Diagram 3] FIG. 2 is a perspective view of FIG. [Figure 4] FIG. 11 shows a second embodiment of the present invention, where (a) is a front view and (b) is a cross-sectional view taken along the line AA of (a). [Diagram 5] 5 is a cross-sectional view of FIG. 4 taken along line B-B. [Figure 6] FIG. 5 is a perspective view of FIG. [Figure 7] FIG. 11 is a front view of a third embodiment of the present invention. [Figure 8] FIG. 8 is a vertical cross-sectional view of FIG. [Figure 9] FIG. 8 is a perspective view of FIG. [Figure 10] FIG. 13 is a front view of a fourth embodiment of the present invention. [Figure 11] FIG. 13 is a front view of the fifth embodiment of the present invention. [Figure 12] FIG. 13 is a longitudinal sectional view of a main portion of a sixth embodiment of the present invention. [Figure 13] FIG. 13 is a vertical cross-sectional view of the cap of FIG. 12. [Figure 14] 1 is a schematic diagram showing a visual state during a friction operation using the friction tool and the thermochromic writing tool of the present invention. (a) shows a state in which the base is viewed from above. (b) shows a state in which the base of (a) is placed on a writing surface and the base is viewed from above. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0024] <First embodiment> A friction device 1 according to a first embodiment of the present invention is shown in Figures 1 to 3. In the friction device of the present invention, "bottom" refers to the friction body side, and "top" refers to the opposite side.

[0025] The friction tool 1 of this embodiment includes a friction body 2, a base 3 having the friction body 2 attached to the underside thereof, and a grip portion 4 provided above the base 3.

[0026] ·Friction body The friction body 2 is integrally formed from a rubber elastic material (a material having rubber elasticity) such as synthetic rubber or elastomer. Examples of the rubber elastic material include silicone resin, SBS resin (styrene-butadiene-styrene copolymer), SEBS resin (styrene-ethylene-butylene-styrene copolymer), polyester resin, olefin resin, ethylene propylene diene rubber (EPDM), and the like. In this embodiment, the friction body 2 is obtained by injection molding of a thermoplastic elastomer (for example, a polyester elastomer, a styrene elastomer). The material having rubber elasticity is preferably made of a low-wear elastic material that generates almost no wear debris during friction, rather than a material made of a high-wear elastic material (for example, an eraser, etc.).

[0027] The friction body 2 is formed of a colored material (opaque material). The friction body 2 includes a friction portion 21 and an attachment portion 22 that is integrally connected to and above the friction portion 21 and has an outer diameter smaller than that of the friction portion 21. The lower end portion (top) of the friction portion 21 is formed into a convex curved shape. An upward step portion 23 is formed between the friction portion 21 and the attachment portion 22. The friction portion 21 and the attachment portion 22 have a circular cross section.

[0028] ·base The base 3 is formed in a plate shape (disc shape). A mounting hole 31 that opens downward is formed in the center of the base 3. The mounting hole 31 has a circular cross section. The mounting hole 31 is configured to penetrate from top to bottom, but may also be configured to open only downward. The mounting portion 22 of the friction body 2 is fixed to the mounting hole 31 by press-fitting or fitting. In a state in which the friction body 2 is fixed to the base 3, the friction portion 21 of the friction body 2 protrudes downward from the bottom surface of the base 3, and the upward step portion 23 of the friction body 2 abuts against the bottom surface of the base 3. Incidentally, examples of the configuration for providing the friction portion 21 on the underside of the base 3 include a configuration in which the friction body 2 is fixed to the mounting hole 31 on the underside of the base 3 by press-fitting or fitting, a configuration in which the friction body is fixed to the underside of the base 3 (or the mounting hole on the underside) by adhesion, welding, two-color molding, or the like, and a configuration in which a protrusion is provided on the underside of the base 3 and the friction body 2 is fixed to the outer surface of the protrusion by press-fitting, fitting, adhesion, welding, two-color molding, or the like.

[0029] The upper and lower surfaces of the base 3 are formed flat. The base 3 is formed like a plate having a uniform thickness. The base 3 is formed from a transparent material. In the present invention, transparent includes translucency as long as it is possible to see through from above and below. Examples of the transparent material constituting the base 3 include synthetic resins such as polypropylene, polyethylene, polyamide, polystyrene, polycarbonate (PC), polyethylene terephthalate (PET), polyethylene naphthalate (PEN), polybutylene terephthalate (PBT), acrylic, and ABS resin, as well as glass.

[0030] The base 3 is provided so as to continuously surround the friction portion 21 in an annular shape. That is, the friction portion 21 is provided so as to be continuously surrounded in an annular shape by the base 3. The base 3 around the friction portion constitutes a see-through portion 32 (annular see-through portion 32) that is continuous in an annular shape and can be seen through from above to below.

[0031] The length in the vertical direction (total length) of the friction body 2 is preferably 5 mm or less. This prevents the silhouette of the friction part 21 from being seen clearly when the upper surface of the base 3 is viewed from a diagonally upward direction slightly radially away from the axially upward direction (directly above) of the base 3 during frictional operation, and allows the periphery of the friction part 21 (i.e., the periphery of the friction point) to be more clearly seen.

[0032] ·Grip part The gripping portion 4 is formed in a tubular (cylindrical) shape. The gripping portion 4 is connected upward from the upper surface of the base portion 3. The gripping portion 4 is formed of a transparent material. As with the base portion 3, examples of the transparent material constituting the gripping portion 4 include synthetic resins such as polypropylene, polyethylene, polyamide, polystyrene, polycarbonate (PC), polyethylene terephthalate (PET), polyethylene naphthalate (PEN), polybutylene terephthalate (PBT), acrylic, and ABS resin, as well as glass.

[0033] The gripping portion 4 is formed on the upper surface of the base 3 at a position a certain distance away from the outer circumferential surface of the friction portion 21 in the radial direction outward so as to surround the see-through portion 32 of the base 3. The side wall of the gripping portion 4 is configured with a see-through portion 41 that allows visibility between the outside and the inside of the gripping portion 4. The annular see-through portion 32 of the base 3 and the silhouette of the friction body 2 can be seen from the outside through the see-through portion 41 of the side wall of the gripping portion 4.

[0034] The grip portion 4 has an upper end opening, which allows the annular see-through portion 32 of the base 3 to be directly viewed from above the base 3 in the axial direction (directly above the base 3) through the upper end opening of the grip portion 4.

[0035] Although the grip portion 4 and the base portion 3 are integrally formed, a configuration in which a member having the grip portion 4 and a member having the base portion 3 are connected to each other may also be used.

[0036] In the friction tool 1 of this embodiment, during friction operation, the periphery of the friction part 21 (the periphery of the friction point on the writing surface) can be clearly seen through the upper and lower surfaces of the annular see-through part 32 made of a transparent material. In addition, the annular see-through part 32 of the base 3 can be seen through the see-through part 41 on the side wall of the grip part 4, and the periphery of the friction part 21 (the periphery of the friction point on the writing surface) can be clearly seen even from a position slightly away in the radial direction from the axial upper side of the base 3 (directly above the base 3).

[0037] The friction device 1 of this embodiment is a friction device having a friction part 21 that can rub a thermochromic image or handwriting on a surface to be written on and can thermochromic the thermochromic image or handwriting with the frictional heat generated during the friction, and the friction device 1 is provided with the friction part 21 and a base 3 made of a transparent material, the friction part 21 is provided so as to protrude downward from the lower surface of the base 3 and to be continuously surrounded by the base 3 in an annular shape, and during a friction operation, the lower surface of the base 3 is opposed to the surface to be written on, and the surface to be written on can be viewed from above the base 3 through the base 3 around the friction part 21 (the annular see-through part 32 of the base 3).

[0038] As a result, the friction device 1 of the present embodiment allows the surroundings of the frictioned portion on the writing surface to be clearly visible during friction operation, and allows only the portion to be thermally discolored reliably and easily.

[0039] The friction device 1 of the present embodiment is a friction device that includes a cylindrical gripping portion 4 made of a transparent material and disposed above the base 3 around the friction portion 21, and is configured so that the upper surface of the base 3 can be seen from outside the gripping portion 4 through the gripping portion 4 (see-through portion 41 on the side wall of the gripping portion 4). During frictional operation, the lower surface of the base 3 is opposed to a surface to be written on, and the surface to be written on can be seen through the gripping portion 4 (see-through portion 41 of the gripping portion 4) and the base 3 around the friction portion 21 (see-through portion 32 of the base 3).

[0040] As a result, in the friction tool 1 of this embodiment, even when the grip portion 4 is gripped during frictional operation, the upper surface of the base 3 can be seen through the grip portion 4 (the see-through portion 41 of the side wall of the grip portion 4) between the fingers holding the grip portion 4 from an obliquely upward direction slightly radially away from the axially upward direction of the base 3. As a result, during frictional operation, the periphery of the friction point on the writing surface can be clearly seen, and only the portion to be thermally discolored can be reliably and easily thermally discolored.

[0041] <Second embodiment> A friction device 1 according to a second embodiment of the present invention is shown in Figs. The friction tool 1 of this embodiment includes a friction body 2, a base 3 having the friction body 2 attached to the underside thereof, and a grip portion 4 provided above the base 3.

[0042] ·Grip part The gripping portion 4 is formed on the upper surface of the base 3 at a certain distance radially outward from the outer circumferential surface of the friction portion 21 so as to surround the see-through portion 32 of the base 3. The gripping portion 4 is connected upward from the upper surface of the base 3 and is composed of a lower portion 4a having a pair of opposing side walls 42 arranged to sandwich the friction portion from both radial sides, and a cylindrical upper portion 4b connected integrally upward from the lower portion 4a. Two window holes 43 are formed between the opposing side walls 42. In addition to this configuration, a configuration in which one side of the pair of opposing side walls 42 are connected to each other to form one window hole may also be used.

[0043] The grip portion 4 is made of an opaque material (for example, a colored synthetic resin or metal). As in the first embodiment, it may be made of a transparent material.

[0044] The window hole 43 of the gripping portion 4 constitutes a see-through portion that allows a view between the outside of the gripping portion 4 and the inside of the gripping portion 4. Through the window hole 43 (see-through portion) of the gripping portion 4, the silhouette of the annular see-through portion 32 of the base 3 and the friction body 2 can be visually recognized from the outside.

[0045] In this embodiment, similarly to the first embodiment, the grip portion 4 has an upper end opening. This allows the annular see-through portion 32 of the base portion 3 to be directly viewed from above the base portion 3 in the axial direction (directly above the base portion 3) through the upper end opening of the grip portion 4.

[0046] The grip portion 4 and the base portion 3 may be configured such that they are integrally formed, or such that a member including the grip portion 4 and a member including the base portion 3 are connected to each other.

[0047] The other configurations (the configurations of the friction body 2 and the base portion 3) are the same as those in the first embodiment.

[0048] In the friction tool 1 of this embodiment, during friction operation, the periphery of the friction portion 21 (the periphery of the friction point on the writing surface) can be clearly seen from the upper to lower surfaces of the annular see-through portion 32 made of a transparent material. In addition, the annular see-through portion 32 of the base 3 can be seen through the window hole 43 (see-through portion) of the gripping portion 4, and the periphery of the friction portion 21 (the periphery of the friction point on the writing surface) can be clearly seen even from a position slightly away in the radial direction from the axial upper side of the base 3 (directly above the base 3).

[0049] The friction device 1 of this embodiment is a friction device having a friction part 21 that can rub a thermochromic image or handwriting on a surface to be written on and can thermochromic the thermochromic image or handwriting with the frictional heat generated during the friction, and the friction device 1 is provided with the friction part 21 and a base 3 made of a transparent material, the friction part 21 is provided so as to protrude downward from the lower surface of the base 3 and to be continuously surrounded by the base 3 in an annular shape, and during a friction operation, the lower surface of the base 3 is opposed to the surface to be written on, and the surface to be written on can be viewed from above the base 3 through the base 3 around the friction part 21 (the annular see-through part 32 of the base 3).

[0050] As a result, the friction device 1 of the present embodiment allows the surroundings of the frictioned portion on the writing surface to be clearly visible during the friction operation, and allows only the portion to be thermally discolored reliably and easily.

[0051] The friction device 1 of the present embodiment is a friction device comprising a gripping portion 4 consisting of opposing side wall portions 42 protruding upward from a base portion 3 around the friction portion 21, a window hole 43 communicating the outside and inside of the gripping portion 4 is formed between the opposing side wall portions 42 of the gripping portion 4, and the upper surface of the base 3 is configured to be visible through the window hole 43 from the outside of the gripping portion 4, and during friction operation, the lower surface of the base 3 is opposed to a surface to be written on, and the surface to be written on is visible through the window hole 43 (see-through portion) and the base 3 around the friction portion 21.

[0052] As a result, in the friction device 1 of the present embodiment, even when the grip portion 4 is gripped during frictional operation, the upper surface of the base 3 can be viewed through the window hole 43 between the fingers holding the grip portion 4 from an obliquely upward direction slightly radially away from the axially upward direction of the base 3. As a result, during frictional operation, the periphery of the frictioned portion on the writing surface can be clearly viewed, and only the portion to be thermally discolored can be reliably and easily thermally discolored.

[0053] <Third embodiment> A friction device 1 according to a third embodiment of the present invention is shown in Figs.

[0054] The friction device 1 of this embodiment includes a friction body 2 and a base 3 having the friction body 2 attached to the underside thereof. The base 3 is formed in a plate shape. The upper and lower surfaces of the base are formed in a semicircular shape, but may also be rectangular.

[0055] ·Grip part The gripping portion 4 is provided on the side of the base 3. The gripping portion 4 is provided so as to protrude radially outward from the side of the base 3. The gripping portion 4 is formed, for example, in a rectangular parallelepiped shape. The gripping portion 4 may have a shape in which the upper surface is a convex curved surface and the lower surface is flat. The lower surface of the gripping portion 4 is preferably flat. The inside of the gripping portion 4 is solid, but may be hollow. The gripping portion 4 is formed from synthetic resin or metal. The lower surface of the base 3 is positioned above the lower surface of the gripping portion 4.

[0056] As shown in Fig. 8, during friction operation, when the upper surface of the gripping portion 4 is gripped with the lower surface of the gripping portion 4 placed on the surface to be written on, the friction portion 21 is set to be pressed against the surface to be written on. That is, as shown in Fig. 7, the lower end of the friction portion 21 is set to protrude from an imaginary extended surface that contacts the lower surface of the gripping portion 4. This allows the thermochromic handwriting or image on the surface to be rubbed with the friction portion 21 while the lower surface of the gripping portion 4 is appropriately brought into sliding contact with the surface to be written on.

[0057] The lower surface of the grip portion 4 becomes a sliding surface with the surface to be written on. The lower surface of the grip portion 4 is formed in a flat shape. As a result, during frictional operation, the lower surface of the grip portion 4 is stably supported on the surface to be written on, and frictional operation can be performed with a small force. Alternatively, the lower surface of the grip portion 4 may be configured with a plurality of protrusion groups. As a result, during frictional operation, the grip portion 4 is stably supported on the surface to be written on by each of the protrusions of the plurality of protrusion groups, and the grip portion can slide smoothly on the surface to be written on.

[0058] The grip portion 4 and the base portion 3 may be configured such that they are integrally formed, or such that a member including the grip portion 4 and a member including the base portion 3 are connected to each other.

[0059] The other configurations (the configurations of the friction body 2 and the base portion 3) are the same as those in the first embodiment.

[0060] The friction device 1 of this embodiment is a friction device having a friction part 21 that can rub a thermochromic image or handwriting on a surface to be written on and can thermochromic the thermochromic image or handwriting with the frictional heat generated during the friction, and the friction device 1 is provided with the friction part 21 and a base 3 made of a transparent material, the friction part 21 is provided so as to protrude downward from the lower surface of the base 3 and to be continuously surrounded by the base 3 in an annular shape, and during a friction operation, the lower surface of the base 3 is opposed to the surface to be written on, and the surface to be written on can be viewed from above the base 3 through the base 3 around the friction part 21 (the annular see-through part 32 of the base 3).

[0061] As a result, the friction device 1 of the present embodiment allows the surroundings of the frictioned portion on the writing surface to be clearly visible during the friction operation, and allows only the portion to be thermally discolored reliably and easily.

[0062] The friction tool 1 of this embodiment includes a gripping portion 4 provided laterally from the base 3, and the upper surface of the base 3 is exposed. When used for friction, the lower surface of the base 3 faces a surface to be written on, and the upper surface of the base 3 is configured so that it can be directly seen from the outside.

[0063] Thereby, in the friction device 1 of the present embodiment, the upper surface of the base 3 can be directly seen during the friction operation even when the grip portion 4 is being gripped. As a result, during the friction operation, the surroundings of the frictioned portion on the writing surface can be clearly seen, and only the portion to be thermally discolored can be reliably and easily thermally discolored.

[0064] <Fourth embodiment> A thermochromic writing instrument 5 according to a fourth embodiment of the present invention is shown in Fig. 10. This embodiment is a thermochromic writing instrument having the friction tool 1 according to the first embodiment at one end. Specifically, a barrel 6 is connected to the upper part of the friction tool (grip 4) of the first embodiment, and a pen tip 61 is provided at the upper end of the barrel 6. In the barrel of the thermochromic writing instrument of the present invention, "upper" refers to the pen tip side, and "lower" refers to the opposite side.

[0065] Thermochromic ink is contained in the barrel 6, and the thermochromic ink can be ejected from the pen tip 61. The pen tip 61 is configured to be retractable from the upper end of the barrel 6, or the pen tip 61 is fixed to the upper end of the barrel 6. The other configurations (the configurations of the friction body 2, the base 3, and the grip part 4) are the same as those in the first embodiment.

[0066] The thermochromic writing instrument 5 of the present embodiment is a thermochromic writing instrument comprising a barrel 6 containing thermochromic ink therein, a pen tip 61 provided at the upper end of the barrel 6 and capable of ejecting the thermochromic ink, and a friction part 21 provided at the lower end of the barrel 6, the friction part 21 rubbing the handwriting made with the thermochromic ink on the writing surface, and capable of thermochromically changing the color of the handwriting by the frictional heat generated at that time, the thermochromic writing instrument comprising: a base 3 provided with the friction part 21 and made of a transparent material at the lower end of the barrel 6; The thermochromic writing instrument has a cylindrical gripping portion 4 made of a transparent material and disposed above the base 3 around the friction portion 21, the gripping portion 4 protruding downward from the underside of the base 3 and continuously surrounded by the base 3 in an annular shape, the upper surface of the base 3 can be seen through the gripping portion 4 from the outside, and during friction operation, the underside of the base 3 is opposed to a surface to be written on, and the surface to be written on can be seen through the gripping portion 4 (see-through portion 41 of the gripping portion 4) and the base 3 around the friction portion 21 (see-through portion 32 of the base 3).

[0067] As a result, with the thermochromic writing instrument 5 of this embodiment, even when the grip portion 4 is gripped during frictional operation, the upper surface of the base 3 can be seen through the grip portion 4 (the see-through portion 41 of the grip portion 4) between the fingers holding the grip portion 4 from an obliquely upward direction slightly radially away from the axially upward direction of the base 3. As a result, during frictional operation, the area around the frictioned point on the writing surface can be clearly seen, and only the portion to be thermally discolored can be reliably and easily thermally discolored.

[0068] <Fifth embodiment> A thermochromic writing instrument 5 according to a fifth embodiment of the present invention is shown in Fig. 11. This embodiment is a thermochromic writing instrument having the friction instrument 1 according to the second embodiment at one end thereof.

[0069] In this configuration, a barrel 6 is provided above the friction device 1 (grip 4) of the second embodiment, and a pen tip 61 is provided at the upper end of the barrel 6. Thermochromic ink is stored in the barrel 6, and the thermochromic ink can be discharged from the pen tip 61. The pen tip 61 is configured to be retractable from the upper end of the barrel 6, or the pen tip 61 is fixed to the upper end of the barrel 6. The other configurations (the configurations of the friction body 2, base 3, and grip 4) are the same as those in the second embodiment.

[0070] The thermochromic writing instrument 5 of the present embodiment is a thermochromic writing instrument comprising a barrel 6 containing thermochromic ink therein, a pen tip 61 provided at the upper end of the barrel 6 and capable of ejecting the thermochromic ink, and a friction part 21 provided at the lower end of the barrel 6, the friction part 21 rubbing the handwriting made with the thermochromic ink on a writing surface and capable of thermochromically changing the color of the handwriting by the frictional heat generated at that time, the thermochromic writing instrument comprising a base 3 provided with the friction part 21 and made of a transparent material at the lower end of the barrel 6, the friction part 21 protruding below the lower surface of the base 3 and This thermochromic writing instrument is provided with a gripping portion 4 consisting of opposing side wall portions 42 that are continuously surrounded by the base 3 in an annular shape and protrude upward from the base 3 around the friction portion 21, and a window hole 43 that communicates with the outside and inside of the gripping portion 4 is formed between the opposing side wall portions 42 of the gripping portion 4, and the upper surface of the base 3 is configured to be visible through the window hole 43 from the outside of the gripping portion 4, and when a friction operation is performed, the lower surface of the base 3 is faced to a surface to be written on, and the surface to be written on is visible through the window hole 43 and the base 3 (see-through portion) around the friction portion 21.

[0071] As a result, with the thermochromic writing instrument of this embodiment, even when gripping grip 4 during frictional operation, the top surface of base 3 can be seen through window hole 43 between the fingers holding grip 4 from a diagonal direction slightly radially above from the axially upper side of base 3. As a result, the area around the frictioned point on the writing surface can be clearly seen during frictional operation, and only the area to be thermally discolored can be reliably and easily thermally discolored.

[0072] Sixth embodiment A thermochromic writing instrument 5 according to a sixth embodiment of the present invention is shown in Figures 12 and 13. In this embodiment, the friction instrument 1 according to the first embodiment is applied as a cap 7. In addition, in the cap of the thermochromic writing instrument of the present invention, "upper" refers to the opening side, and "lower" refers to the opposite side.

[0073] ·Shaft cylinder Thermochromic ink is accommodated inside the barrel 6. A pen tip 61 capable of ejecting the thermochromic ink is provided at the upper end of the barrel 6. A cap 7 (friction device 1) is provided on the pen tip side of the barrel 6 in a detachable manner.

[0074] ·cap The friction tool 1 (cap 7) includes, as in the first embodiment, a friction body 2, a base 3 having the friction body 2 attached to its underside, and a gripping portion 4 (cylindrical cap body) provided above the base 3.

[0075] A protrusion that can be fitted onto the pen tip side outer surface of the barrel 6 is provided on the inner surface of the grip portion 4. The protrusion is, for example, an annular protrusion 71 and a point-like protrusion 72 that are arranged vertically spaced apart from each other. The other configurations (the configurations of the friction body 2, the base portion 3, and the grip portion 4) are the same as those in the first embodiment.

[0076] The present embodiment is a thermochromic writing instrument comprising a barrel 6 containing thermochromic ink therein, a pen tip 61 provided at one end of the barrel 6 and capable of discharging the thermochromic ink, a cap 7 provided removably on the pen tip side of the barrel 6, and a friction part 21 provided at the lower end of the cap 7, the friction part 21 rubbing the handwriting of the thermochromic ink on the writing surface and capable of thermochromically changing the color of the handwriting by the frictional heat generated at that time, the friction part 21 is provided at the lower end of the cap 7 and a base 3 made of a transparent material, the friction part 21 is The cap 7 protrudes downward from the underside of the base 3 and is continuously surrounded by the base 3 in an annular shape, the cap 7 has a tubular gripping portion 4 made of a transparent material and disposed above the base 3 around the friction portion 21, the upper surface of the base 3 is configured to be visible through the gripping portion 4 from outside the gripping portion 4, and during friction operation, the underside of the base 3 is faced to a surface to be written on, and the surface to be written on is configured to be visible through the gripping portion 4 (see-through portion 41 of the gripping portion 4) and the base 3 around the friction portion 21 (see-through portion 32 of the base 3), making this a thermochromic writing instrument.

[0077] As a result, with the thermochromic writing instrument 5 of this embodiment, even when the cap 7 is removed from the barrel 6 and the grip part 4 of the cap 7 is gripped during frictional operation, the upper surface of the base 3 can be seen through the grip part 4 (see-through part 41) between the fingers holding the grip part 4 from an obliquely upward direction slightly radially away from the axially upward direction of the grip part 4. As a result, the area around the friction point on the writing surface can be clearly seen during frictional operation, and only the part to be thermally discolored can be reliably and easily thermally discolored.

[0078] <Conceptual diagram of the action of the present invention> 14 is a conceptual diagram for explaining the action of the present invention during frictional operation. The action is common to the first to sixth embodiments.

[0079] Handwriting (e.g., ABCDEFG) is written in five rows on the surface to be written on (on the paper surface) in thermochromic ink. During the friction operation, the friction body 2 is pressed against a portion of the thermochromic handwriting that is to be thermochromic (e.g., D in the third row), and the silhouette of the friction body 2 can be seen from above the base 3 through the annular see-through portion 32 of the base 3, while the written surface around the friction body 2 (around the friction point) can be clearly seen. [Explanation of symbols]

[0080] 1 Friction tool 2 Friction body 21 Friction part 22 Mounting part 23 Step section 3 base 31 Mounting hole 32 Transparent part 4 Grip part 41 Transparent part 42 Opposite side wall 43 Window hole (see-through part) 5 Thermochromic writing implements 6 shaft cylinder 61 Pen Tip 7 Cap (friction tool) 71 Ring protrusion 72 Punctate process S writing surface

Claims

1. A friction tool having a friction part capable of rubbing a thermochromic image or handwriting on a surface to be written on and thermochromic the thermochromic image or handwriting with frictional heat generated at the time, The friction portion; a base portion provided with the friction portion and made of a transparent material; the friction portion is provided so as to protrude downward from a lower surface of the base portion and to be continuously surrounded by the base portion in an annular shape, A friction tool characterized in that, during friction operation, the lower surface of the base is opposed to the surface to be written on, and the surface to be written on is visible from above the base through the base around the friction portion.

2. A cylindrical grip portion is provided above a base around the friction portion and made of a transparent material, The upper surface of the base is configured to be visible through the grip portion from the outside of the grip portion, The friction tool according to claim 1 , wherein, during a frictional operation, a lower surface of the base is opposed to a surface to be written on, and the surface to be written on is visible through the gripping portion and the base around the friction portion.

3. a gripping portion including opposing side walls protruding upward from a base portion around the friction portion; A window hole is formed between the opposing side wall portions of the grip portion, the window hole communicating between the outside and the inside of the grip portion, The upper surface of the base is configured to be visible through the window hole from the outside of the grip portion, The friction tool according to claim 1 , wherein, during a friction operation, the lower surface of the base is opposed to the surface to be written on, and the surface to be written on is visible through the window hole and the base around the friction portion.

4. 2. The friction tool according to claim 1, further comprising a gripping portion provided laterally from the base, an upper surface of the base being exposed, and a lower surface of the base being opposed to a surface to be written on during friction use, so that the upper surface of the base is directly visible from the outside.

5. The pen comprises a barrel containing thermochromic ink therein, a pen tip provided at an upper end of the barrel and capable of discharging the thermochromic ink, and a friction part provided at a lower end of the barrel, The friction part rubs the handwriting made of the thermochromic ink on a surface to be written on, and the frictional heat generated at that time can thermally change the color of the handwriting. The friction portion is provided at a lower end of the barrel, and a base portion made of a transparent material is provided. the friction portion is provided so as to protrude downward from a lower surface of the base portion and to be continuously surrounded by the base portion in an annular shape, A cylindrical grip portion is provided above a base around the friction portion and made of a transparent material, The upper surface of the base is configured to be visible through the grip portion from the outside of the grip portion, A thermochromic writing implement characterized in that, during a friction operation, the underside of the base is opposed to the surface to be written on, and the surface to be written on is visible through the base around the gripping portion and the friction portion.

6. The pen comprises a barrel containing thermochromic ink therein, a pen tip provided at an upper end of the barrel and capable of discharging the thermochromic ink, and a friction part provided at a lower end of the barrel, The friction part rubs the handwriting made of the thermochromic ink on a surface to be written on, and the frictional heat generated at that time can thermally change the color of the handwriting. The friction portion is provided at a lower end of the barrel, and a base portion made of a transparent material is provided. the friction portion is provided so as to protrude downward from a lower surface of the base portion and to be continuously surrounded by the base portion in an annular shape, a gripping portion including opposing side walls protruding upward from a base portion around the friction portion; A window hole is formed between the opposing side wall portions of the grip portion, the window hole communicating the outside and the inside of the grip portion, The upper surface of the base is configured to be visible through the window hole from the outside of the grip portion, A thermochromic writing implement characterized in that, during a friction operation, the underside of the base is opposed to the surface to be written on, and the surface to be written on is visible through the window hole and the base around the friction portion.

7. The pen comprises a barrel containing thermochromic ink therein, a pen tip provided at one end of the barrel and capable of discharging the thermochromic ink, a cap provided removably on the pen tip side of the barrel, and a friction part provided at the lower end of the cap, The friction part rubs the handwriting made of the thermochromic ink on a surface to be written on, and the frictional heat generated at that time can thermally change the color of the handwriting. The cap has a lower end provided with the friction portion and a base made of a transparent material, the friction portion is provided so as to protrude downward from a lower surface of the base portion and to be continuously surrounded by the base portion in an annular shape, The cap includes a cylindrical gripping portion that is provided above a base portion around the friction portion and is made of a transparent material, The upper surface of the base is configured to be visible through the grip portion from the outside of the grip portion, A thermochromic writing implement characterized in that, during a friction operation, the underside of the base is opposed to the surface to be written on, and the surface to be written on is visible through the base around the gripping portion and the friction portion.

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