JP6625445B2 - Friction tools - Google Patents

Description

  The present invention relates to a friction tool for discoloring handwriting drawn with thermochromic ink by frictional heat.

  2. Description of the Related Art Conventionally, there has been known a thermochromic ink which becomes colorless when heated to a certain temperature or more (for example, 65 ° C. or more). When a handwriting drawn with such a thermochromic ink is rubbed by a friction tool described in, for example, Patent Document 1 (Japanese Patent Application Laid-Open No. 2013-116588), a certain amount or more is generated by frictional heat generated at that time. , And becomes colorless.

  As shown in FIG. 6, the friction tool 201 of the cited document 1 includes a case 202 having a substantially elliptical cross section and a friction body 203 inserted into the case 202 and having a substantially elliptical cross section. are doing. The friction body 203 has substantially the same length as the case 202. The case 202 is provided with a window 203d on the long diameter side surface, and the friction body 203 is exposed outward from the window 203d. During use, the portion of the friction body 203 exposed from the window 203d is pushed, so that the front end region of the friction body 203 is exposed forward from the front end 203a of the case 202.

  By the way, the friction body 203 used for the friction tool 201 is made of a low-wear elastic material that does not generate debris during friction. For this reason, even when the friction by the friction body 203 is repeated for a long period of time, a portion other than the front end region of the friction body 203 is practically not used for friction. Further, the unit price of the raw material of the friction body 203 per unit weight is higher than the unit price of the raw material of the case 203 per unit weight. For this reason, manufacturing a portion that is not used for friction with the same raw material as the friction body 203 increases the cost of the friction tool 201, and thus has been regarded as a problem.

JP 2013-116588 A

  The present invention has been made based on such circumstances. An object of the present invention is to provide a friction device that can be manufactured at low cost by reducing the size of the friction body.

  The present invention is a friction tool for discoloring handwriting drawn with thermochromic ink by frictional heat, defining an opening at a front end, a case provided with a window on a side surface, and a case where the opening is provided. A friction member fixed to the case so that a front end protrudes outward, the friction member includes a base disposed in the case, and a friction portion protruding outward from the opening, A projection extending from the base in a direction different from that of the friction portion, and projecting outward from the case through the window of the case.

  ADVANTAGE OF THE INVENTION According to this invention, since a friction body is supported by the front end of a case, a friction body can be miniaturized compared with the conventional friction tool, and the friction tool which can be manufactured at low cost can be provided.

  Preferably, the case includes a plurality of members including a first member and a second member, and the window is formed on at least one of the first member and the second member. I have. In this case, it is easy to fix the base of the friction body in the case.

  Also, preferably, the first member has a fitted portion on an inner surface, and the second member has a fitting portion fitted on the fitted portion on an inner surface, The first member and the second member have a cross-sectional contour line curved outward, the fitted portion is provided at the center in the width direction of the first member, and the fitting portion is , Provided at the center in the width direction of the second member.

  In this case, since the fitting portion and the fitted portion exist at the position where the thickness of the case is the largest, the fitting depth can be maximized, and strong fitting can be realized. Further, since the case can be assembled only by fitting, the workability is good.

  Further, the first member has a first pin on an inner surface, the second member has a second pin on an inner surface, and the friction body has a first through hole and a second through hole. Preferably, the first pin is inserted into the first through hole, and the second pin is preferably inserted into the second through hole.

  In this case, since the friction body can be firmly fixed to the case, even if friction is performed with a strong force, the friction body does not undesirably fall out of the case.

  Preferably, the ridge and the window are line-symmetric with respect to a virtual axis extending in the front-rear direction at the center in the width direction of the case, and the first pin and the second pin are line-symmetric with respect to the virtual axis. Wherein the first through-hole and the second through-hole are at line-symmetric positions with respect to the virtual axis.

  In this case, when assembling the friction body to the case, in addition to the assembling mode in which the first pin is inserted into the first through hole and the second pin is inserted into the second through hole, the friction body is connected to the virtual axis. It is possible to perform an assembling mode in which the first pin is inserted into the second through-hole and the second pin is inserted into the first through-hole.

  In the friction tool as described above, it is preferable that the cross section of the case is substantially elliptical, and the edge of the opening is curved forward at the center in the long axis direction.

  In this case, the friction tool can be easily gripped, and the user's fingertip has a structure that makes it difficult for the user to touch the friction portion of the friction body. Therefore, it is possible to provide a friction tool with good usability.

  Further, the case has the window on the side surface on the long axis side, and the friction body has a ridge in the area corresponding to the window as the ridge, Is preferably exposed outward from the window.

  In this case, since the protrusion of the friction body is engaged with the window in a retaining state, the friction body can be securely fixed to the case. Furthermore, since the user's finger is hooked on the ridge, a non-slip structure for restricting the movement (slipping) of the finger in the longitudinal direction with respect to the friction device is realized, so that a friction device with a better feeling of use can be provided. it can.

  In order to further enhance such an effect, a plurality of the window portions are provided on each of the two side surfaces on the long axis side of the case along the front-rear direction, and the ridges correspond to the window portions. It is preferable that the same number of the windows are provided in the region along the front-rear direction.

  ADVANTAGE OF THE INVENTION According to this invention, since a friction body is supported by the front end of a case, a friction body can be miniaturized compared with the conventional friction tool, and the friction tool which can be manufactured at low cost can be provided.

1 is a schematic perspective view showing a friction tool according to an embodiment of the present invention. FIG. 2 is an exploded perspective view of the friction tool of FIG. It is a schematic plan view which shows the friction body of the friction tool of FIG. It is a schematic front view which shows the friction body of the friction tool of FIG. It is a schematic side view which shows the friction body of the friction tool of FIG. It is a schematic front view which shows the 1st member of the case in the friction tool of FIG. FIG. 2 is a schematic rear view illustrating a first member of a case in the friction tool of FIG. 1. It is a schematic side view which shows the 1st member of the case in the friction tool of FIG. FIG. 2 is a schematic longitudinal sectional view showing a first member of a case in the friction tool of FIG. 1. It is a schematic bottom view which shows the 1st member of the case in the friction tool of FIG. FIG. 4B is a sectional view taken along line II of FIG. 4B. It is a schematic front view which shows the 2nd member of the case in the friction tool of FIG. FIG. 2 is a schematic rear view illustrating a second member of a case in the friction tool of FIG. 1. It is a schematic side view which shows the 2nd member of the case in the friction tool of FIG. FIG. 2 is a schematic longitudinal sectional view illustrating a second member of a case in the friction tool of FIG. 1. It is a schematic bottom view which shows the 2nd member of the case in the friction tool of FIG. FIG. 5B is a sectional view taken along line II-II of FIG. 5B. It is a schematic perspective view which shows the conventional friction tool.

  Hereinafter, an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

  FIG. 1 is a schematic perspective view showing a friction tool 100 according to an embodiment of the present invention, and FIG. 2 is an exploded perspective view of the friction tool 100 of FIG.

  As shown in FIGS. 1 and 2, a friction tool 100 according to the present embodiment defines an opening 21 at a front end and a case 20 made of an ABS resin having windows 32 and 42 on side surfaces, and an opening 21. And a friction body 10 made of a thermoplastic elastomer made of SEBS resin and fixed to the case 20 so that a front end projects outward from 21. In this specification, the front end means the end where the friction body 10 is located in the longitudinal direction dl of the friction portion 100.

  The friction body 10 is used for discoloring the handwriting drawn by the thermochromic ink by frictional heat. As shown in FIGS. 1 and 2, a friction body 10 according to the present embodiment includes a base 11 disposed in a case 20, a friction portion 12 projecting outward from an opening 21 of the case 20, and a case 20. And the ridge 13 protruding outside of the case 20 through the windows 32 and 42 of FIG.

  The case 20 supports the friction body 10 and provides a grip for the user of the friction tool 100. As shown in FIG. 2, the case 20 of the present embodiment is configured such that a first member 30 and a second member 40 are fitted to each other, and has a substantially elliptical cross section as described later. Have. In addition, the case 20 of the present embodiment gradually decreases in thickness (dimension in the thickness direction db) toward the front (see FIGS. 4C and 5C).

  FIG. 3A is a schematic plan view showing the friction body 10 of the friction tool 100 of FIG. 1, FIG. 3B is a schematic front view showing the friction body 10 of the friction tool 100 of FIG. 1, and FIG. 1 is a schematic side view showing a friction body 10 of the friction tool 100 of FIG.

  As shown in FIGS. 3A to 3C, the friction body 10 of the present embodiment has a substantially elliptical outer shape in plan view. The base 11 of the friction body 10 is smaller in size in both the width direction da (long axis direction) and the thickness direction db (short axis direction) than the friction portion 12. Specifically, in a state where the base 11 of the friction body 10 is fixed in the case 20, substantially no step is formed at a connection portion between the outer surface of the case 20 and the outer surface of the friction portion 12 of the friction body 10. The outer diameter of the base portion 11 is reduced from the outer diameter of the friction portion 12 by an amount corresponding to the thickness of the peripheral wall of the case 20 (see FIG. 1).

  Further, as shown in FIG. 3B, the rear edge 12a of the friction portion 12 is curved forward (upward in FIG. 3B) at the center in the width direction da. Although not shown, also on the back surface of the friction body 10 in FIG. 3B, the rear edge 12a of the friction portion 12 is curved forward at the center in the width direction da.

  The base 11 of such a friction body 10 is provided with a ridge 13 extending vertically from the outer surface. The ridge 13 is exposed outward from the window 32 of the case 20 to engage with the window 32 in a retaining state (see FIG. 1). The protruding ridge 13 of the present embodiment extends in the width direction da of the base 11, and has an arc shape curved forward at the center of the width direction da. As shown in FIG. 3B, two protrusions 13 of the present embodiment are provided on the long side surface 11 a of the base 11 along the longitudinal direction dl. Further, as shown in FIG. 3C, two protrusions 13 are provided along the longitudinal direction dl on the long side surface 11a of the base 11 also on the back surface of the friction body 10 in FIG. 3B.

  As shown in FIG. 3B, a first through hole 14 and a second through hole 15 having the same inner diameter are provided in a region 16 between the ridge 13 a in front of the base 11 and the rear edge 12 a of the friction portion 12. Are provided along the width direction da. These first and second through holes 14 and 15 will be described later in detail, but engage with first and second pins 36 and 46 provided in the case 20 to fix the friction body 10 and the case 20 together. This is for strengthening (see FIG. 2).

  Next, FIG. 4A is a schematic front view showing the first member 30 of the case 20 in the friction tool 100 of FIG. 1, and FIG. 4B is a schematic view showing the first member 30 of the case 20 in the friction tool 100 of FIG. 4C is a schematic side view showing the first member 30 of the case 20 in the friction tool 100 of FIG. 1, and FIG. 4D is a schematic view of the first member 30 of the case 20 in the friction tool 100 of FIG. FIG. 4E is a schematic bottom view showing the first member 30 of the case 20 in the friction tool 100 shown in FIG. 1, and FIG. 4F is a sectional view taken along line II of FIG. 4B.

  As described above, the case 20 of the present embodiment is configured by fitting the first member 30 and the second member 40 to each other (see FIG. 2). As shown in FIGS. 4A to 4F, the first member 30 according to the present embodiment corresponds to one of two cases in which the case 20 having a substantially elliptical cross section is divided into two parts in the longitudinal direction at a substantially central position in the thickness direction. It is a shell-shaped member. That is, the outer shape of the first member main body 31 along the width direction da has a shape corresponding to half of the major axis side of the ellipse. As shown in FIGS. 4A and 4B, the first member 30 has a first member main body 31 that is substantially rectangular in plan view, and the front edge 31 a of the first member main body 31 is located at the center in the width direction da. The part is curved forward. The shape of the curved front edge 31a corresponds to the shape of the rear edge 12a of the friction portion 12 of the friction body 10 (see FIG. 3B).

  As shown in FIGS. 4A to 4D, two windows 32 are provided in the front region of the first member 30 along the longitudinal direction dl.

  As shown in FIG. 4C, the thickness of the first member 30 (the length in the thickness direction db) decreases slightly from the rear (the lower side in FIG. 4C) to the front (the upper side in FIG. 4C). .

  The first member 30 of the present embodiment has first to third fitted portions 33, 34, 35 on the back surface (inner surface) in order to realize fitting with a second member 40 described later. I have. As shown in FIGS. 4B to 4D, the first fitted portion 33 is provided immediately behind the rear window portion 32b, and the third fitted portion 35 is provided at the rear end of the first member main body 31. It is provided in the vicinity. The second fitted portion 34 is provided at a position corresponding to the midpoint of a line connecting the first fitted portion 33 and the third fitted portion 35. As shown in FIG. 4B, the first to third fitted portions 33, 34, 35 of the present embodiment are aligned in the longitudinal direction dl at the center of the first member main body 31 in the width direction da.

  As shown in FIGS. 4B and 4D, the first to third fitted portions 33, 34, 35 of the present embodiment all extend from the back surface of the first member main body 31 in the thickness direction db of the case 20. Implemented as a sleeve. On the inner surface of each fitted portion 33, 34, 35, in order to further firmly fit the first to third fitting portions 43, 44, 45 provided on the second member 40 described later. , And first to third flat surfaces 33a, 34a, and 35a. Specifically, as shown in FIGS. 4B and 4D, a pair of first and third flat surfaces 33a, 35a facing each other in the width direction da are formed on the inner surfaces of the first and third fitted portions 33, 35. Is formed. On the other hand, a pair of second flat surfaces 34a facing each other in the longitudinal direction dl are formed on the inner surface of the second fitted portion 34. Due to the presence of the first to third flat surfaces, the cross sections of the first to third fitted portions 33, 34, and 35 have a shape in which the inner contour line connects a part of an arc with a straight line. The distance between the two planes that form each of the first to third flat surfaces 33a, 34a, and 35a is the first to third mating when the respective flat surfaces 33a, 34a, and 35a do not exist. It is smaller than the inner diameter of the parts 33, 34, 35.

  Further, as shown in FIG. 4B, the first member 30 has a first pin near the right in the width direction da of the front end region 37 between the front edge 31a and the front window 32a when viewed from the back. 36 are provided. The first pin 36 has a circular cross section and extends in the thickness direction db of the case 20. The diameter of the cross section of the first pin 36 is slightly smaller than the inner diameter of the first and second through holes 14 and 15 provided in the base 11 of the friction body 10.

  Next, FIG. 5A is a schematic front view showing the second member 40 of the case 20 in the friction tool 100 of FIG. 1, and FIG. 5B is a schematic view showing the second member 40 of the case 20 in the friction tool 100 of FIG. FIG. 5C is a schematic side view showing the second member 40 of the case 20 in the friction tool 100 of FIG. 1, and FIG. 5D is a schematic side view of the second member 40 of the case 20 in the friction tool 100 of FIG. 5E is a schematic bottom view showing the second member 40 of the case 20 in the friction tool 100 of FIG. 1, and FIG. 5F is a sectional view taken along line II-II of FIG. 5B.

  As shown in FIGS. 5A to 5F, the second member 40 according to the present embodiment is formed by dividing a case 20 having a substantially elliptical cross section into two parts in a longitudinal direction at a substantially central position in a thickness direction. It is a shell-shaped member corresponding to a member other than the member 30. That is, the outer shape of the second member main body 41 along the width direction has a shape corresponding to half of the major axis side of the ellipse. As shown in FIGS. 5A and 5B, the second member 40 has a second member main body 41 that is substantially rectangular in plan view, and is located in front of the second member main body 41 (above in FIGS. 5A and 5B). The edge 41a is curved forward at the center in the width direction da. Like the front edge 31a of the first member 30, the shape of the curved edge 41a corresponds to the shape of the rear edge 12a of the friction portion 12 of the friction body 10 (see FIG. 3B).

  As shown in FIGS. 5A to 5D, two windows 42 are provided in the front region of the second member 40, similarly to the first member 30.

  Further, as shown in FIG. 5C, the thickness (the length in the thickness direction db) of the second member 40 decreases slightly from the rear (lower in FIG. 5C) to the front (upper in FIG. 5C). .

  The second member 40 of the present embodiment has first to third fitting portions 43, 44, 45 on the back surface (inner surface) in order to realize the fitting with the first member 30 described above. As shown in FIGS. 5B to 5D, the fitting portions 43, 44, 45 are provided at positions corresponding to the first to third fitted portions 33, 34, 35 provided on the first member 30. ing. That is, the first fitting portion 43 is provided immediately behind the rear window portion 42b, and the third fitting portion 45 is provided near the rear end of the second member main body 41. The mating portion 44 is provided at a position corresponding to the midpoint of a line connecting the first fitting portion 43 and the third fitting 45. As shown in FIG. 5B, the first to third fitting portions 43, 44, and 45 of the present embodiment are aligned in the longitudinal direction dl at the center of the second member main body 41 in the width direction da.

  As shown in FIGS. 5B and 5D, each of the first to third fitting portions 43, 44, and 45 of the present embodiment is a cylinder extending from the back surface of the second member main body 41 in the thickness direction db of the case 20. It is realized as a projection of a shape. The diameter of the cross section of this projection is slightly smaller than the inner diameter of the first to third fitted parts 33, 34, 35. However, the distance is slightly larger than the distance between each of the pair of flat surfaces 33a, 34a, 35a provided in each of the fitted portions 33, 34, 35. In addition, each projection is configured to be hollow, and when being fitted to the first to third fitted portions 33, 34, 35, a slight compressive deformation in the radial direction is allowed.

  Further, as shown in FIG. 5B, the second member 40 has a second pin, as viewed from the back, on the left side in the width direction da of the front end region 47 between the front edge 41 a and the front window 42 a. 46 are provided. The second pin 46 has a circular cross section and extends in the thickness direction db of the case 20. The outer shape of the second pin 46 is the same as the outer shape of the first pin 36, and is slightly smaller than the inner diameters of the first and second through holes 14 and 15 provided in the base 11 of the friction body 10.

  Also, as shown in FIGS. 3B, 4A, 4B, 5A, and 5B, in the present embodiment, the ridge 13 and the windows 32, 42 extend in the longitudinal direction dl at the center in the width direction of the case 20. It is line-symmetric with respect to the extending virtual axis l. Further, the first pin 36 and the second pin 46 are at line-symmetric positions with respect to the virtual axis l, and the first through-hole 14 and the second through-hole 15 are line-symmetric with respect to the virtual axis l.

  Next, returning to FIG. 2, an example of a method of assembling the friction tool 100 according to the embodiment of the present invention will be described.

  First, the ridge 13 of the friction member 10 is inserted into the window 42 of the second member 40, and the second pin 46 of the second member 40 is inserted into the second through hole 15 of the friction member 10. Thus, the friction body 10 is assembled to the second member 40.

  Then, in this state, the first member 30 is assembled to the second member 40 and the friction body 10. Specifically, the first to third fitting portions 43, 44, and 45 of the second member 40 are inserted into the first to third fitted portions 33, 34, and 35 of the first member 30. The first member 30 is positioned with respect to the second member 40. At this time, although not shown in FIG. 2, the first pin 36 of the first member 30 is inserted into the first through hole 14 of the friction body 10, and the ridge 13 of the friction body 10 is Is positioned so as to face the window part 32 of the second.

  Then, when the first member 30 is pressed toward the second member 40, the first to third fittings of the second member 40 into the first to third fitted portions 33, 34, 35 of the first member 30. The parts 43, 44, 45 are press-fitted. When this press-fitting is completed, the ridge 13 of the friction body 10 is exposed outward from the window 32 of the first member 30, and the ridge 13 is engaged with the windows 32 and 42 in a retaining state, and The first member 30 and the second member 40 are connected without a gap except for the opening 21.

  As described above, the first to third fitted portions 33, 34, and 35 of the present embodiment are provided with a pair of first to third flat surfaces 33a, 34a, and 35a on each inner surface. The outer diameters of the first to third fitting portions 43, 44, and 45 are slightly larger than the distance between the flat surfaces 33a, 34a, and 35a. Therefore, the first to third fitting portions 43, 44, 45 of the second member 40 are pressed into the first to third fitted portions 33, 34, 35 of the first member 30, so that the first member 30 is pressed. -The third fitting portions 43, 44, 45 are slightly compressed and deformed in the radial direction. Therefore, a large frictional force acts between the first to third flat surfaces 33a, 34a, 35a and the first to third fitting portions 43, 44, 45, and the first member 30 is moved from the second member 40 Undesired falling off is prevented.

  As described above, the first and third flat surfaces 33a and 35a are each formed as a pair of flat surfaces parallel to the longitudinal direction dl of the first member 30, and the second flat surface 34a is Are formed as a pair of planes parallel to the width direction da. Therefore, rattling of the first member 30 in the width direction da with respect to the second member 40 is prohibited by the fitting of the first and third fitted portions 33 and 35 with the first and third fitting portions 43 and 45. Is done. Further, by the fitting of the second fitted portion 34 and the second fitting portion 44, rattling of the first member 30 in the longitudinal direction dl with respect to the second member 40 is prohibited. That is, when the fitting of the first member 30 to the second member 40 is completed, rattling is prohibited in both the width direction da and the longitudinal direction dl of the first member 30 with respect to the second member 40.

  In the present embodiment, the ridge 13 and the windows 32 and 42 are line-symmetric with respect to an imaginary axis l extending in the longitudinal direction dl at the center in the width direction of the case 20, and the first pin 36 and the second pin 46 Are in a position symmetrical with respect to the virtual axis l, and the first through hole 14 and the second through hole 15 are in a position symmetrical with respect to the virtual axis l (FIGS. 3B, 4A, 4B, 5A, and 5B). reference). Therefore, the assembling mode in which the friction body 10 is inverted by 180 ° about the virtual axis l, the first pin 36 is inserted into the second through-hole 15, and the second pin 46 is inserted into the first through-hole 14. It is possible.

  Next, the operation of the friction device 100 of the present embodiment will be described.

  First, the case 20 is gripped by the user, and the friction portion 12 of the friction body 10 is brought into contact with the handwriting drawn with the thermochromic ink.

  Then, the friction tool 100 is repeatedly moved back and forth in a state where the user presses the friction portion 12 against the friction surface (paper surface or the like) on which the handwriting is drawn, so that the friction portion 12 and the friction surface are moved between the friction portion 12 and the friction surface. Friction heat is generated. When the frictional heat reaches a certain temperature or higher, the handwriting becomes colorless.

  Since the friction portion 12 of the present embodiment has a substantially elliptical cross section, if the friction surface 12 is rubbed using the long axis side portion 12b (see FIGS. 1 and 2) of the friction portion 12, If the handwriting is thermally discolored over a large area and rubbed using the short-axis side portion 12c (see FIGS. 1 and 2) of the friction portion 12, only the handwriting having a small area is thermally discolored.

  According to the friction device 100 of the present embodiment as described above, since the friction body 10 is supported at the front end of the case 20, the friction body 10 is compared with the conventional friction device 201 (see FIG. 6). The friction device 100 that can be reduced in size and manufactured at low cost can be provided.

  In addition, since the case 20 of the present embodiment includes the first member 30 and the second member 40, it is easy to fix the base 11 of the friction body 10 in the case 20.

  Further, the first member 30 has first to third fitted portions 33, 34, 35 on the back surface (inner surface), and the second member 40 has the first to third fitted portions on the back surface (inner surface). It has first to third fitting portions 43, 44, and 45 that fit into the fitting portions 33, 34, and 35, respectively. In the first member 30 and the second member 40, the outline of the cross section is curved outward in the width direction da. The first to third fitted portions 33, 34, 35 are provided at the center of the first member 30 in the width direction da, and the first to third fitted portions 43, 44, 45 are also provided by the second member. 40 is provided at the center in the width direction da. Because of these, the first to third fitted portions 33, 34, 35 and the first to third fitting portions 43, 44, 45 are fitted at the position where the thickness of the case 20 is the largest, The depth of the fitting can be maximized, and a firm fitting can be realized. Furthermore, since the friction tool 100 can be assembled only by fitting, workability is good.

  The first member 30 has a first pin 36 on the back surface (inner surface). The second member 40 has a second pin 46 on the back surface (inner surface), the friction body 10 has a first through hole 14 and a second through hole 15, and the first pin 36 has a first through hole. The second pin 46 is inserted in the hole 46, and the second pin 46 is inserted in the second through hole 15. That is, in addition to the engagement between the ridge 13 and the windows 32 and 42, the friction body 10 can also be engaged by the engagement between the first and second pins 36 and 46 and the first and second through holes 14 and 15. It is fixed to 20. For this reason, the friction body 10 can be firmly fixed to the case 20, and even if the friction tool 100 is used with a strong force, the friction body 10 does not undesirably fall off the case 20.

  In addition, the ridge 13 and the windows 32 and 42 of the present embodiment are symmetric with respect to the virtual axis l extending in the longitudinal direction dl at the center in the width direction of the case 20. Further, the first pin 36 and the second pin 46 are at line-symmetric positions with respect to the virtual axis l, and the first through-hole 14 and the second through-hole 15 are line-symmetric with respect to the virtual axis l. Thus, when assembling the friction body 10 to the case 20, the first pin 36 is inserted into the first through hole 14 and the second pin 46 is inserted into the second through hole 15. In addition, there is also an assembling mode in which the friction body 10 is turned 180 ° about the virtual axis l, the first pin 36 is inserted into the second through-hole 15, and the second pin 46 is inserted into the first through-hole 14. Workability is good because it becomes possible.

  In the friction device 100 according to the present embodiment, the contour of the cross section of the case 20 is substantially elliptical, and the front edges 31a and 41a of the first member 30 and the second member 40 are located forward at the center in the width direction da. It is curved. For this reason, the user can easily grip the friction device 100, and the fingertip of the user is difficult to touch the friction portion 12 of the friction body 10, so that the friction device 100 with good usability can be provided.

  Specifically, the case 20 has windows 32 and 42 on the front and back sides, and the friction body 10 has the ridge 13 curved forward in a region corresponding to the windows 32 and 42. I have. The ridge 13 is exposed outward from the windows 32 and 42 and is engaged with the windows 32 and 42 in a retaining state. More specifically, a plurality of windows 32 and 42 are provided on each of two long sides of the case 20 along the longitudinal direction, and the ridge 13 is provided in a region corresponding to the windows 32 and 42. The same number of windows 32 and 42 are provided along the front-back direction.

  With such a structure, it is easy to securely fix the base 11 of the friction body 10 in the case 20. Furthermore, since the user's finger is caught on the ridge 13 and a non-slip structure for restricting the movement of the finger in the longitudinal direction with respect to the friction tool 100 is realized, the friction tool 100 having a better feeling of use is provided. be able to.

da width direction (long axis direction)
db Thickness direction (minor axis direction)
dl longitudinal direction (front-back direction)
l Virtual axis line 10 Friction body 11 Base 11a Long axis side surface 12 Friction section 12a Rear edge 12b Long axis side section 12c Short axis side section 13 Ridge 13a Ridge 13b Ridge 14 first through hole 15 Second through-hole 16 Region 20 between front ridge and rear edge of friction portion Case 21 Opening 30 First member 31 First member main body 31a Front edge 32 Window 32a Front window 32b Rear Window 33 First fitted portion 33a First flat surface 34 Second fitted portion 34a Second flat surface 35 Third fitted portion 35a Third flat surface 36 First pin 37 Front end region 40 Second member 41 Second member main body 41a Front edge portion 42 Window portion 43 First fitting portion 44 Second fitting portion 45 Third fitting portion 46 Second pin 47 Front end area 100 Friction tool

Claims (8)

A friction tool for discoloring handwriting drawn by thermochromic ink by frictional heat,
A case in which an opening is defined at the front end and a window is provided on the side,
A friction body front end is rotated immovably fixed against the casing so as to protrude outward from the opening,
With
The friction body is
A base disposed in the case,
A friction portion protruding outward from the opening,
A projection extending from the base in a direction different from the friction portion and projecting outward from the case via the window of the case;
A friction tool comprising: The case includes a plurality of members including a first member and a second member,
The friction device according to claim 1, wherein the window is formed on at least one of the first member and the second member. The first member has a fitted portion on an inner surface,
The second member has a fitting portion fitted to the fitted portion on an inner surface,
In the first member and the second member, the outline of the cross section is curved outward,
The fitted portion is provided at the center in the width direction of the first member,
The friction member according to claim 2, wherein the fitting portion is provided at a center of the second member in a width direction. The first member has a first pin on an inner surface,
The second member has a second pin on an inner surface,
The friction body has a first through hole and a second through hole,
The first pin is inserted into the first through hole,
The friction tool according to claim 2, wherein the second pin is inserted into the second through hole. The projection and the window are line-symmetric with respect to a virtual axis extending in the front-rear direction at the center in the width direction of the case,
The first pin and the second pin are located at line-symmetric positions with respect to the virtual axis,
The friction tool according to claim 4, wherein the first through-hole and the second through-hole are at line-symmetric positions with respect to the virtual axis. The friction according to any one of claims 1 to 5, wherein the case has a substantially elliptical cross section, and an edge of the opening is curved forward at a central portion in a long axis direction. Utensils. The case has the window on a side surface on a long axis side,
The friction body has, as the projection, a ridge in a region corresponding to the window,
7. The friction tool according to claim 6, wherein the ridge is exposed outward from the window. A plurality of the window portions are provided on each of two long-axis side surfaces of the case along the front-rear direction,
The friction tool according to claim 7, wherein the same number of the protrusions as the number of the windows are provided in a region corresponding to the windows along the front-rear direction.

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