JP6629098B2 - 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, for example, a friction tool described in Patent Document 1 (Japanese Unexamined Patent Application Publication 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.

  In such a friction tool 201, since the front end 203a of the case has a shape cut out by a plane orthogonal to the longitudinal direction, a finger may touch the friction body 203 during use. However, as a result of the investigation, the inventor of the present invention has found that when the user's finger does not touch the frictional portion (the portion in contact with the surface to be rubbed) of the friction body 203 when using the frictional tool 201, It was found that the feeling was good.

  Further, the friction body 203 used in 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 from 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. SUMMARY OF THE INVENTION It is an object of the present invention to provide a friction device that can be manufactured at a low cost while reducing the size of the friction body and has a good feeling in use.

  The present invention is a friction tool for discoloring handwriting drawn by thermochromic ink by frictional heat, a case defining an opening at a front end, and a front end protruding outward from the opening. A friction body fixed to the case, 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. It is a friction tool.

  According to the present invention, since the edge of the opening of the case is curved forward at the central portion in the long axis direction, the user's finger easily touches the friction portion of the friction body when using the friction tool. Nothing. Further, since the friction body is supported at the front end of the case, the friction body can be reduced in size as compared with a conventional friction tool, and a friction tool that can be manufactured at low cost can be provided.

  Preferably, the case has a window curved forward on the side surface on the long axis side, and the friction body has a ridge curved forward in a region corresponding to the window. The ridge is exposed outward from the window.

  More preferably, the window portion is provided on each of two long sides of the case along the front-back direction, and the ridge is provided in a region corresponding to the window portion in the front-back direction. And the same number as the windows.

  In this case, since the plurality of projections engage with the corresponding plurality of windows in the retaining state, the friction body can be securely fixed to the case. Furthermore, since the ridge has a shape curved forward, the ridge fits the user's finger, so that the user's finger does not undesirably slip on the friction tool. .

  Preferably, the thickness of the case in the short axis direction gradually decreases toward the front. In this case, the grip of the friction tool is good, and the friction tool can be used comfortably.

  ADVANTAGE OF THE INVENTION According to this invention, since the edge part of the opening part of a case is curving forward in the center part of a longitudinal direction, a user's finger does not touch a friction body easily at the time of using a friction tool. . Furthermore, since the friction body is supported at the front end of the case, the friction body can be reduced in size as compared with a conventional friction tool, and a friction tool that 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 ridge 13 of the present embodiment extends in the width direction da of the base 11, and has an arc shape curved forward in 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, on the inner surface of the second fitted portion 34, a pair of second flat surfaces 34a facing each other in the longitudinal direction dl are formed. Due to the existence 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.

  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 31 a and the front window 32 a 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.

  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, 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 in the vicinity of 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 in the shape of a circle. 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.

  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, 35 and the first and third fitting portions 43, 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 while the user presses the friction portion 12 against the surface to be rubbed (such as a paper surface) on which the handwriting is drawn, so that the friction portion 12 and the surface to be rubbed are moved. 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, the front edges 31a and 41a of the opening 21 of the case 20 are curved forward at the center in the width direction da (long axis direction). When the friction tool 100 is used, the user's finger does not easily touch the friction portion 12 of the friction body 10, so that it is possible to provide the friction tool 100 having a good feeling in use. Furthermore, since the friction body 10 is supported at the front end of the case 20, the friction body 10 can be reduced in size as compared with the conventional friction tool 201 (see FIG. 6), and the friction tool 100 that can be manufactured at low cost. Can also be provided.

  In addition, the case 20 has windows 32 and 42 curved forward on the side face on the long axis side, and the friction body 10 is provided with ridges 13 curved forward in regions corresponding to the windows 32 and 42. have. The ridge 13 is exposed outward from the windows 32 and 42. More specifically, two windows 32 and 42 are provided on each of two long sides of the case 20 along the long axis direction along the longitudinal direction dl. In the area corresponding to 42, two are provided along the longitudinal direction dl. Thus, the four ridges 13 are engaged with the corresponding four windows 32 and 42 in a retaining state, so that the friction body 10 can be securely fixed to the case 20. Furthermore, since the ridge 13 has a shape curved forward, the ridge 13 fits the user's finger, and the user's finger slides undesirably on the friction tool 10. There is nothing.

  In addition, since the thickness (dimension in the thickness direction db) of the case 20 according to the present embodiment gradually decreases toward the front, the grip of the friction device 100 is good, and the friction device 100 can be used comfortably. can do.

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 (6)

A friction tool for discoloring handwriting drawn by thermochromic ink by frictional heat,
A case defining an opening at the front end,
A friction body fixed to the case so that a front end protrudes outward from the opening;
With
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 ,
The case has a window on a side surface,
The friction body has a protrusion in a region corresponding to the window,
The friction tool , wherein the projection is engaged with the window . The window has a shape curved forward,
The friction body has a forward curved shape
The friction tool according to claim 1, wherein: The protrusion is a ridge
The friction tool according to claim 1, wherein: Before SL projections, the friction device according to any one of claims 1 to 3, characterized in that exposed outward from the window portion. 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 convex portion is in a region corresponding to the window portion, the friction device according to any one of claims 1 to 4, characterized in that provided the same number as the window portion along the longitudinal direction. The friction tool according to any one of claims 1 to 5 , wherein the case has a thickness in a short axis direction gradually decreasing toward the front.

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