JP6611563B2 - Friction tool - Google Patents

Description

  The present invention relates to a friction tool. More specifically, the present invention relates to a friction tool provided with a friction body capable of rubbing a handwriting with a thermochromic ink on a paper surface and thermally changing the handwriting of the thermochromic ink with frictional heat generated at that time.

  Conventionally, there are, for example, Patent Document 1 and Patent Document 2 as friction bodies having rubber elasticity for discoloring a handwriting formed using reversible thermochromic ink from a first state to a second state by frictional heat.

  However, in the friction body as described in Patent Document 1, the cross-sectional shape is generally circular or square, and the heat on the paper surface can be obtained by using the tip, edge, or corner. Although it was considered to thermally discolor a narrow area of a handwriting with a color-changing ink, it was not considered to thermally discolor a wide area of a handwriting, and a small friction body as described in Patent Document 1 It was difficult to move the area gradually while rubbing it, and to rub a large area. It should be noted that the hot air from the dryer may be used to thermally discolor a large area, but the hot air from the dryer spreads when it hits the paper, making it difficult to discolor only the target location. Met.

  In view of such a problem, the applicant of the present application discloses a friction body having a substantially elliptical cross section and having friction portions at the front and rear ends in Japanese Patent Application Laid-Open No. 2013-116588 “Friction Tool”.

JP 2004-148744 A JP 2009-126102 A JP 2013-116588 A

  By the way, in the friction body as described in Patent Documents 1 to 3, the elastic material constituting the friction body is not a highly wearable elastic material (for example, an eraser), and erase scraps are generated during friction. It is preferably made of a non-wearing elastic material. For this reason, there is no or little wear due to wear during friction.

  Moreover, even if the friction body as a whole is made of an elastic material, the friction portions that come into contact with the paper surface are the front end surface, the rear end surface, the corner portions of the edge portions, and the like, and there are almost no cases where the front surface or the back surface is used. Furthermore, when the entire friction body is made of an elastic material, the cost increases, and there is a problem that it becomes difficult to provide a display portion such as sink marks or printing at the time of molding.

  Furthermore, according to Patent Document 3, while it has the effect of being able to thermally discolor a large area of handwriting at once, the frictional body tends to make it difficult to see the handwriting on the paper surface, and heat discoloration to unnecessary portions. There was a new problem that there was a risk of losing.

  The present invention is intended to solve the above-mentioned conventional problems, and is intended to provide a friction tool capable of thermally discoloring only a target portion in a wide area of a handwriting with a thermochromic ink on a paper surface. is there.

In order to achieve the above object, the present invention provides a friction tool comprising a friction portion made of an elastic material having elasticity capable of thermally discoloring handwriting formed on a paper surface using thermochromic ink by frictional heat. The friction tool includes a main body made of transparent or translucent, a friction part provided on at least a part of the peripheral edge of the main body, and gripping parts provided on the front surface and the back surface of the main body. The part is provided integrally, and the tip of the back surface side can be visually recognized through the main body from the front surface side of the main body .

  In addition, the main body is a lens portion that can be visually recognized by enlarging the thermochromic handwriting on the paper surface.

  Further, the friction part is provided in a cross-sectional shape so as to be positioned outward from the longest part in the front-rear direction and the vertical direction of the main body, and the friction part places the friction tool on a plane. When it does, it becomes a contact part which contacts the said plane, It is characterized by the above-mentioned.

  Furthermore, the main body includes a gripping portion that rubs the handwriting, and the gripping portion is made of an elastic material having rubber elasticity.

  According to the first configuration of the present invention, the friction tool includes a main body made of transparent or translucent, and a friction portion provided on at least a part of the periphery of the main body, so that the thermochromic ink is obtained. The thermochromic handwriting formed on the paper surface can be visually observed through the main body, and the desired portion can be easily rubbed. In addition, transparent or translucent means that what is ahead is seen through or slightly seen through, and may be white translucent or colored translucent.

  According to the 2nd structure of this invention, the said main body formed on the paper surface using the thermochromic ink by making the thermochromic handwriting on the said paper surface into an enlarged and visible lens part. The thermochromic handwriting can be enlarged and viewed, eliminating the need to carry a friction tool and a magnifying glass. In addition, when a part of a picture or pattern is subject to thermal discoloration or a ball having a ball diameter of 0.4 mm or less. It can also be suitably used for applications in which fine portions are thermally discolored using corners, such as used handwriting. The lens portion can be exemplified by a convex lens, a biconvex lens, a concave lens, a biconcave lens, a concavo-convex lens, a Fresnel lens, and the like. preferable.

  According to the third configuration of the present invention, the friction portion is provided in a cross-sectional shape so as to be located outward from the longest portion in the front-rear direction and the vertical direction of the main body, and the friction portion is the friction portion. When the tool is placed on a flat surface, it comes into contact with the flat surface. As a result, even when the friction tool is placed on a flat surface such as a desk or when it falls to the ground, the friction part having rubber elasticity contacts the desk or the ground, so that the main body can be hardly damaged.

According to the first configuration of the present invention, the main body includes a grip portion that rubs the handwriting, and the grip portion is made of an elastic material having rubber elasticity, so that when the user uses the friction portion, It is difficult to slip and facilitates a friction operation, and having a grip portion on the main body has an effect of suppressing dirt such as hand dirt compared to the case of directly gripping the main body.

  The shape of the gripping part is not particularly limited, but the friction part is removed from the main body by continuously forming the front surface, the peripheral edge (friction part), and the back surface with the same material as the friction part. Detachment can be effectively suppressed.

  In the present invention, examples of the elastic material constituting the friction portion include a resin having rubber elasticity (rubber, elastomer). For example, silicone resin, SBS resin (styrene-butadiene-styrene copolymer), SEBS resin (styrene-) Ethylene-butadiene-styrene copolymer), fluorine resin, chloroprene resin, nitrile resin, polyester resin, ethylene propylene diene rubber (EPDM), and the like. The elastic material constituting the friction part is most preferably not a highly wearable elastic material (for example, an eraser), but a low wear elastic material that does not cause erase scraps during friction.

  In the present invention, the material constituting the main body includes synthetic resin, glass and the like, particularly thermoplastic resin, specifically, PMMA resin (polymethacrylate resin), ABS resin (acrylonitrile-butadiene-styrene copolymer). PP resin (polypropylene), POM resin (polyoxymethylene), PC resin (polycarbonate), PS resin (polystyrene), PET resin (polyethylene terephthalate), etc. are preferred, and a non-crystalline resin that is a highly transparent material is selected By doing so, it is preferable because the visibility is improved, and an acrylic resin such as PMMA resin or a PC resin can be exemplified. The synthetic resin described above is preferably made from a single synthetic resin.

  The external shape of the friction tool is not particularly limited, such as a circle, a square, a rectangle, a parallelogram, an oval, an oval, an egg, or the like when viewed from the front. A symmetrical shape is preferred. The body shape is not particularly limited, such as a circle, a square, or a rectangle, a parallelogram, an oval shape, an oval shape, an egg shape, etc. in front view, but in view of friction operation and portability, The main body shape is preferably a thin plate, for example, in which the thickness between the front surface and the back surface is shorter than the length between the side surfaces in a cross section perpendicular to the front-rear direction. Further, in a front view, a shape having a longitudinal direction such as an elongated shape is preferable. When a lens part or a grip part is provided, a thin plate having a convex, concave, or concentric groove on the front and / or back of the main body. It is preferable to provide a Fresnel lens.

  The friction portion is preferably provided at least at a part of the peripheral edge of the main body, preferably at a plurality of locations, and more preferably at the entire periphery. In consideration of the feel during the friction operation, the R surface without an acute edge portion when viewed from the front. It is preferable that Further, it is preferable that the circumference is not a circle having the same curvature but a plurality of curvatures so that a small area and a large area are easily rubbed. Furthermore, in order to frictionally operate a small area, the contact area between the friction part and the paper surface is small, and the friction load per unit area tends to be large. It is preferable to make it thicker than the thickness of the portion. The thickness of the friction part may be set as appropriate depending on the hardness of the material forming the friction part and the shape of the friction part, but if the thickness becomes too thin, the friction part is easily damaged during friction, There is a risk of leaving marks on paper. Specifically, the thickness of the friction part is desirably 1 mm or more at the thin part.

  In addition, when the friction part is formed in a spire shape or a convex curved surface on the cross-sectional view, the tip of the friction part becomes easy to see. It is preferable because contact is possible, an appropriate contact area between the friction portion and the paper surface is obtained, and generation of frictional heat is facilitated.

  Furthermore, the method of providing the friction portion on the main body is not particularly limited, such as bonding, fusion, overpass fitting, press fitting, two-color molding, etc., but considering productivity, etc. The two-color molding is preferable.

  According to the friction tool of the present invention, it is possible to thermally discolor only a targeted portion in a wide area of handwriting by the thermochromic ink on the paper surface.

It is the external view which looked at the friction tool of Example 1 from the front. It is the external view which looked at the friction tool of Example 1 from the side surface. It is the external view which looked at the friction tool of Example 1 from the plane. It is AA sectional drawing in FIG. It is a perspective view of the friction tool of Example 1. FIG. 1 is a perspective view of a main body of Example 1. FIG. It is the external view which looked at the friction tool of Example 2 from the front. It is BB sectional drawing in FIG. It is the external view which looked at the friction tool of Example 3 from the front. It is the external view which looked at the friction tool of Example 3 from the side surface. It is the external view which looked at the friction tool of Example 3 from the plane. It is CC sectional drawing in FIG. It is a perspective view of the friction tool of Example 31.

  Embodiments of a friction tool according to the present invention will be described below with reference to the drawings. In addition, in order to make explanation easy to understand, the same number is attached | subjected about the same member and the same part in drawing. In the description of the present embodiment, the front side of the drawing is expressed as the front side, the opposite side is expressed as the rear side, the surface visible in plan view is expressed as the front surface, and the opposite side is expressed as the back surface.

  The structure of the friction tool 1 of the present embodiment will be described with reference to FIGS. The friction tool 1 is provided with a main body 2 made of PC resin and a friction portion 3 made of SEBS resin on the periphery (front end edge 2C, rear end edge 2D, both side edges 2E) of the main body 2. The friction tool 1 has an oval shape in which the curvatures of the front end portion 3A and the rear end portion 3B and the curvatures of the side surface portions 3C are different in a front view. Further, as shown in FIG. 5, the main body 2 is a biconvex lens portion in which a cross section in a direction orthogonal to the front-rear direction is formed in an elliptical shape, and the front surface portion 2A and the back surface portion 2B are convex curved surfaces. . The friction portion 3 protrudes toward the front and back sides of the main body 2 and the friction projection 3 protrudes toward the front and back sides of the main body 2 so that the friction portion 3 is not easily detached from the main body 2. A locking projection 3E is provided.

  Further, the thickness of the corner portion 3D where the front end portion 3A and the rear end portion 3B of the friction portion intersect with the side surface portions 3C is made thicker than the thickness of the other portions. Specifically, the thickness of the thickest corner 3D is 7 mm, and the thickness of the other part is 3 mm.

  In order to use the friction tool 1, the friction tool 1 is gripped, and the friction portion 3 is pressed against and rubbed with a handwriting (not shown) formed on the paper surface using thermochromic ink. The handwriting can be thermally discolored by the generated frictional heat. At this time, the handwriting can be enlarged and viewed through the main body.

  The friction tool 11 of the second embodiment shown in FIGS. 7 and 8 obtains the friction tool 11 in the same manner as in the first embodiment except that the shape of the friction portion 13 is changed. The friction part 13 is mounted so as to largely cover the peripheral edge of the main body 12, and the friction tool 11 has the cross-sectional shape with the friction part 13 outward than the longest part in the front-rear direction and the vertical direction of the main body 12. It is formed to be positioned.

  Therefore, when the friction tool 11 is placed on a smooth desk (not shown), the friction part 13 becomes the outermost surface rather than the main body 2, so that the main body 2 does not contact the desk but the friction part 13 contacts. The part 13G comes into contact with the desk.

  The friction tool 21 of the third embodiment shown in FIGS. 9 to 13 obtains the friction tool 21 in the same manner as in the first embodiment except that the gripping portion 23F is provided on the front surface 22A and the back surface 22B of the main body 22. . The grip part 23F is provided integrally with the friction part 23. The friction part 23 is provided continuously with the front surface 22 </ b> A, the back surface 22 </ b> B, and the periphery of the main body 22. Moreover, the friction tool 21 is formed so that the friction part 23 is located outward from the longest part in the front-rear direction and the vertical direction of the main body in the cross-sectional shape.

  When the friction tool 21 is placed on a smooth desk (not shown), the outermost surface of the friction part 23 becomes the outer surface rather than the main body 22, so that the main body 22 does not contact the desk and the friction part 23 comes into contact. The part 23G (grip part 23F) comes into contact with the desk.

  In order to use the friction tool 21, the grip part 23F of the friction tool 21 is gripped, and the friction part 23 is rubbed against the handwriting (not shown) formed on the paper surface using the thermochromic ink. The handwriting can be thermally discolored by frictional heat generated at that time. At this time, the handwriting can be enlarged and viewed through the main body.

  In this embodiment, the main body is a convex lens, but a lens portion made of a Fresnel lens can be provided on the surface of the main body. By forming the lens portion as a Fresnel lens, it can be formed into a thin plate.

  In addition to rubbing thermochromic handwriting formed on the paper surface using the thermochromic ink, the friction tool of the present invention can also be used for rubbing the thermochromic ink that has been printed or painted on the paper surface or the like in advance. Can also be used. Moreover, a through-hole can be provided in a main body, and string members, such as a strap, can also be penetrated.

  In addition, since the main body includes a through-hole through which the string-like member can be inserted, the strap can be inserted to improve portability, and the material flow path is too long in the direction of flowing from the gate into the cavity. Then, the jetting phenomenon which produces the meandering trace on the surface of a molded article can also be suppressed.

1, 11, 21 Friction tool 2, 12, 22 Main body 2A, 12A, 22A Front surface 2B, 12B, 22B Back surface 2C Front end 2D Rear end 2E Side surface 2F, 12F, 22F Locking protrusions 3, 13, 23 Friction part 3A, 13A, 23A Front end part 3B, 13B, 23B Rear end part 3C, 13C, 23C Side face part 3D, 13D, 23D Corner part 3E, 13E, 22E Locking protrusion 23F Grasping part 13G, 23G Contact part

Claims (3)

A friction tool comprising a friction part made of an elastic material having elasticity capable of heat-coloring a handwriting formed on a paper surface using a thermochromic ink by frictional heat, wherein the friction tool is a transparent or translucent body. And a friction part provided on at least a part of the peripheral edge of the main body, and a grip part provided on the front surface and the back surface of the main body, the friction part and the grip part being provided integrally, the surface of the main body A friction tool characterized in that the tip of the back side can be visually recognized from the side through the main body . 2. The friction tool according to claim 1, wherein the main body serves as a lens portion that is visible by enlarging a thermochromic handwriting on the paper surface. When the friction part is positioned outside the longest part in the longitudinal direction and the vertical direction of the main body in the cross-sectional shape, and the friction part is placed on the plane, the plane The friction tool according to claim 1, wherein the friction tool is a contact portion that comes into contact with the friction member.

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