JP6523770B2 - Eraser and writing instrument - Google Patents

Description

  The present invention relates to an eraser attached to a writing instrument and a writing instrument including the eraser.

  2. Description of the Related Art Conventionally, a writing instrument is used in which a holder is provided at the rear end of a barrel of a writing instrument and an eraser such as an eraser is detachably attached to the holder.

  Patent Document 1 discloses a multi-core writing instrument, in which an elastic part having a rubber elasticity for detachably attaching a crown to the rear of its barrel and discoloring or erasing the handwriting of the writing body is provided on the outer surface of the crown. There is disclosed a multi-core writing instrument exposed to the

  Patent Document 2 describes a friction body made of a soft resin having a rubber-like elasticity capable of thermally discoloring the handwriting of the thermochromic ink by rubbing the handwriting of the thermochromic ink and friction heat generated at that time. A thermochromic writing instrument is disclosed in which a concave portion or a convex portion is provided on the side surface of the mounting portion of the friction body, and a convex portion or a concave portion is provided on the inner surface of the cylinder of the writing instrument or the holding member. ing.

  Further, Patent Document 3 discloses a writing tool in which a friction body is molded and fitted as a separate member, and a writing tool in which a friction body is integrally formed on a writing tool main body (shaft body) by two-color molding.

  The elastic parts and friction members of Patent Documents 1 to 3 formed as separate members have a problem that they may fall off from the crown and the holding member when they are used vigorously. Moreover, when it shape | molds integrally with the writing tool main body like the friction body of patent document 3, when dirt attached, there existed a problem of being hard to replace a friction body.

JP, 2013-49192, A JP, 2014-124900, A JP, 2007-223302, A

  An object of the present invention is to provide an eraser which is replaceably attached to a writing instrument and which is hard to come off the eraser in use.

  According to the invention of claim 1, the eraser attached to the rear end of the writing instrument, wherein the fitting unit which fits with the rear end of the writing instrument and the fitting unit are fixed and written on the fitting unit And an erasing unit capable of discoloring or erasing the drawn lines, wherein the fitting unit is formed of a material having higher rigidity than the material forming the erasing unit, and the fitting unit and the erasing unit are formed by two-color molding An eraser is provided which is integrally formed by the

  According to the invention of claim 2, the eraser according to the invention of claim 1 is provided, wherein the erasing unit is fixed to the outer periphery of the fitting unit.

  According to the invention of claim 3, a clip is provided on the side surface of the fitting portion, and the erasing portion is fixed to the rear end of the fitting portion. An eraser is provided.

  According to the invention as set forth in claim 4, the fitting portion has a protrusion which protrudes laterally from the side surface of the rear end portion of the fitting portion, and the erasing portion encloses the protrusion and the fitting is performed. The invention according to claim 1, wherein the rear end portion of the fitting portion is fixed to the mating portion, and the cross-sectional shape viewed from the side is formed in a cross shape by the rear end portion and the projection portion. A subordinate eraser is provided.

  According to the invention described in claim 5, there is provided a writing instrument having the eraser according to the invention described in any one of claims 1 to 4 attached to the rear.

  In the eraser according to the present invention, since the fitting portion to be fitted to the rear end portion of the writing tool is formed of a material having higher rigidity than the material forming the erasing portion, it is compared with the case where only the erasing portion is formed as a separate member. Can be attached more firmly to the rear end of the writing instrument. Further, since the fitting portion and the erasing portion are integrally formed by two-color molding, it is possible to prevent the erasing portion from coming out of the fitting portion even in heavy use.

It is a figure which shows the eraser by 1st embodiment of this invention, and Fig.1 (a) is the perspective view seen from the front, FIG.1 (b) is the perspective view seen from the back. It is a figure which shows the eraser by 1st embodiment of this invention, FIG. 2 (a) is a front view, FIG.2 (b) is a top view, FIG.2 (c) is the II-II line of FIG.2 (b). It is sectional drawing along. It is a figure which shows the writing instrument which attached the eraser by 1st embodiment of this invention, FIG. 3 (a) is a top view, FIG.3 (b) is sectional drawing along the III-III line of FIG. 3 (a) It is. It is a figure which shows the eraser by 2nd embodiment of this invention, FIG. 4 (a) is the perspective view seen from the front, FIG.4 (b) is the perspective view seen from the back. It is a figure which shows the eraser by 2nd embodiment of this invention, FIG. 5 (a) is a front view, FIG.5 (b) is a top view, FIG.5 (c) is a VV line of FIG.5 (b). It is sectional drawing along. It is a figure which shows the writing instrument which attached the eraser of 2nd embodiment of this invention, FIG. 6 (a) is a top view, FIG.6 (b) is sectional drawing along the VI-VI line of FIG. 6 (a) It is. It is a figure which shows the eraser by 3rd embodiment of this invention, FIG. 7 (a) is the perspective view seen from the front, FIG.7 (b) is the perspective view seen from the back. It is a figure which shows the eraser by 3rd embodiment of this invention, FIG. 8 (a) is a front view, FIG.8 (b) is a top view, FIG.8 (c) is the VIII-VIII line of FIG.8 (b). It is sectional drawing along. It is a figure which shows the writing instrument which attached the eraser by 3rd embodiment of this invention, FIG. 9 (a) is a top view, FIG.9 (b) is sectional drawing along the IX-IX line of FIG. 9 (a) It is.

  Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. In the following embodiments, the same or similar components are denoted by the same reference numerals, and the drawings are appropriately scaled in order to facilitate understanding. In the present specification, "front" refers to the writing nib side of a writing instrument, and "back" refers to the opposite side.

First Embodiment
1 and 2 are views showing an eraser 10 according to a first embodiment of the present invention, FIG. 1 (a) is a perspective view as viewed from the front, and FIG. 1 (b) is a perspective view as viewed from the rear. 2 (a) is a front view, FIG. 2 (b) is a plan view, and FIG. 2 (c) is a cross-sectional view taken along the line II-II in FIG. 2 (b). 3 is a view showing a writing instrument to which the eraser of FIGS. 1 and 2 is attached, and FIG. 3 (a) is a plan view, and FIG. 3 (b) is along the line III-III of FIG. 3 (a). FIG.

  The eraser 10 shown in FIGS. 1 and 2 is an eraser 10 attached to the rear end portion 101 of the writing instrument 100 as shown in FIG. 3 and is written by, for example, a plurality of writing refills 1 accommodated inside the writing instrument 100. It is provided to discolor or erase the drawn lines. The eraser 10 includes a fitting portion 14 to be fitted to the rear end portion 101 of the writing instrument 100, and an erasing portion 12 fixed to the fitting portion 14 and capable of discoloring or erasing drawn lines.

  The writing refill 1 contains a thermochromic ink or an eraser erasable ink that can be erased, decolored, or discolored by the abrasion of the eraser 10. Alternatively, a thermochromic core, a pencil core, or a sharp core may be used.

  In addition, a thermochromic ink maintains a predetermined color (1st color) at normal temperature (for example, 25 degreeC), and when it raises temperature to a predetermined temperature (for example, 60 degreeC), it changes to another color (2nd color) It is an ink that has the property of changing and then returning to the original color (first color) when cooled to a predetermined temperature (for example, -5 ° C). In a writing instrument using a thermochromic ink, to make the second color colorless and heating a drawn line written in the first color (for example, red) to be colorless is referred to as "erasing". Therefore, the writing surface on which the drawn lines are written is abraded with the eraser 10 as a friction body to generate frictional heat, thereby changing the drawn lines into achromatic, that is, erasing.

  As a matter of course, the second color may be a color other than colorless. The coloring material contained in the thermochromic ink is an essential three of (A) an electron donating color developing organic compound, (B) an electron accepting compound, and (C) a reaction medium for determining the onset temperature of the color reaction of both. A reversible thermochromic microcapsule pigment in which a reversible thermochromic composition containing at least a component is encapsulated in microcapsules is preferably used. The reversibly thermochromic microcapsule pigment preferably has an average particle size in the range of 0.1 to 5.0 μm, preferably 0.5 to 2 μm. The reversible thermochromic microcapsule pigment is preferably blended in an amount of 4 to 30% by weight based on the total amount of the ink composition. The “average particle size” specified in the thermochromic ink is measured using a particle size distribution analyzer [Particle Size Analyzer N4 Plus (manufactured by COULTER)], and at the time of measurement, the sample is diluted with water until it reaches the N4 Plus recommended concentration. It is a value measured by a dynamic light scattering method under a temperature condition of 25.degree.

  In addition, an eraser erasable ink is a colored resin particle having an average particle diameter of 2 to 20 μm and being non-thermoplastic and having a glass transition point of less than 0 ° C. and 5 to 30% by weight based on the total amount of the ink composition. And at least non-colored particles. The “average particle diameter” defined by the eraser erasable ink is the value of D50 obtained by measuring the average particle diameter by a laser diffraction method using a particle size distribution measuring apparatus [Microtrac HRA 9320-X100 (manufactured by Nikkiso Co., Ltd.)]. is there.

  In the present embodiment, the erasing unit 12 is a rubber elastic material such as a thermosetting rubber such as silicone rubber, nitrile rubber, ethylene propylene rubber, ethylene propylene diene rubber or a thermoplastic elastomer such as a styrene elastomer, an olefin elastomer, or a polyester elastomer. It is selected from a material, a mixture of two or more rubber elastic materials, a mixture of a rubber elastic material and a synthetic resin, and a plastic eraser containing a plasticizer. When a thermochromic ink is used for writing refill 1, the taper wear amount at the wear wheel H22 of the Taber abrasion tester under a load of 9.8 N and 1000 rpm under the abrasion test (ASTM D1044) defined in JIS K7204 It is preferred that it is less than 15. When an eraser erasable ink is used, the amount of Taber abrasion at the abrasion wheel CS-17 of the Taber abrasion tester under the load of 9.8 N and 1000 rpm under the abrasion test (ASTM D1044) specified in JIS K7204 is It is preferable that it is 5 mg or more. Further, the fitting portion 14 is formed of a material having a rigidity higher than that of the material forming the erasing portion 12, and is formed of, for example, a synthetic resin such as polycarbonate or acrylonitrile butadiene styrene. Alternatively, the fitting portion 14 may be formed of a rubber elastic material having a hardness higher than the durometer hardness specified in JIS K6203.

  The fitting portion 14 of the present embodiment is formed in a cylindrical shape, and the erasing portion 12 is fixed to the outer periphery of the fitting portion 14 by two-color molding. The fitting portion 14 and the erasing portion 12 are integrally formed by two-color molding, so that the erasing portion 12 is firmly attached to the fitting portion 14 and the erasing portion 12 is easily detached from the fitting portion 14 There is no

  Further, since the erasing unit 12 of the present embodiment is fixed to the outer periphery of the fitting unit 14, the erasing unit 12 resists the force applied from the direction to be moved when using the erasing unit 12, for example, the A direction in FIG. Thus, the erasing unit 12 is less likely to come off the fitting unit 14.

  The fitting portion 14 is formed in a tubular shape, and as shown in the figure, an inner screw is formed on the inner wall thereof. Further, an external thread is formed on the outer wall of the projecting portion 102 formed at the rear end portion 101 of the writing instrument 100, and the fitting portion 14 can be fitted with the projecting portion 102 through the screw. . When the erasing unit 12 becomes dirty, the eraser 10 can be removed from the rear end portion 101 of the writing instrument 100 and easily replaced.

Second Embodiment
The eraser 20 according to a second embodiment of the present invention will be described. 4 and 5 are views showing the eraser 20 according to the second embodiment, and FIG. 4 (a) is a perspective view as viewed from the front, and FIG. 4 (b) is a perspective view as viewed from the rear. 5 (a) is a front view, FIG. 5 (b) is a plan view, and FIG. 5 (c) is a cross-sectional view taken along the line V-V in FIG. 5 (b). Moreover, FIG. 6 is a figure which shows the writing instrument 200 which attached the eraser 20 of 2nd embodiment and accommodated the several writing refill 2 in the inside, FIG. 6 (a) is a top view, FIG.6 (b) is a figure. Fig. 6 is a cross-sectional view taken along line VI-VI of Fig. 6 (a).

  The eraser 20 is an eraser attached to the rear end of the writing instrument, like the eraser 10 of the first embodiment, and is fitted with the fitting section 24 to be fitted with the rear end 201 of the writing instrument 200, and the erasing section 22. Equipped with Unlike the eraser 10 of the first embodiment, the eraser 20 of the present embodiment is further provided with a clip 25 on the side surface of the fitting portion 24. The clip 25 is formed to extend forward of the writing instrument 200 when the eraser 20 is attached to the writing instrument 200, and can pinch an object in cooperation with the outer wall of the barrel of the writing instrument 200.

  The erasing portion 22 and the fitting portion 24 of the eraser 20 are integrally formed by two-color molding, and the erasing portion 22 is fixed to the rear end portion of the fitting portion 24. In this embodiment, by integrally forming the fitting portion 24 provided with the clip 25 and the erasing portion 22, it is possible to reduce the number of parts of the entire writing instrument and to shorten the total length of the entire writing instrument.

  The fitting portion 24 of the present embodiment is formed of synthetic resin having high rigidity because it has the clip 25. However, if the material forming the fitting portion 24 is a material that is higher in rigidity than the material forming the erasing portion 22 and is capable of performing two-color molding with the erasing portion 22, the hardness is higher than the durometer hardness specified in JIS K6203. It may be formed of a rubber elastic material.

  The fitting portion 24 is formed in a hollow cylindrical shape, and the locking rib 27 is formed on the inner surface thereof. The eraser 20 is attached to the writing instrument 200 by inserting and fitting the insertion section 202 extending from the rear end of the writing instrument 200 into the hollow section of the fitting section 24.

  A cylindrical body 26 is formed at the rear end portion of the fitting portion 24. The erasing portion 22 includes a portion 26a in which the cylindrical body 26 protrudes rearward from the rear end portion of the fitting portion 24, and the erasing portion It integrates by two-color molding so that a part of 22 may be filled also in the inside of barrel 26. The erasing unit 22 is fixed to a part of the outer peripheral portion of the cylinder or the inside from the rear end of the fitting unit 24 so that, for example, a direction perpendicular to the axial direction of the writing instrument when using the eraser 20 (see FIG. Even when a force is applied in the direction of the arrow B in 6), the erasing portion 22 does not easily come off from the rear end portion of the fitting portion 24.

Third Embodiment
The eraser 30 according to the third embodiment of the present invention will be described. 7 and 8 are views showing the eraser 30 according to the third embodiment, and FIG. 7 (a) is a perspective view as viewed from the front, and FIG. 7 (b) is a perspective view as viewed from the rear. 8 (a) is a front view, FIG. 8 (b) is a plan view, and FIG. 8 (c) is a cross-sectional view taken along the line V-V in FIG. 8 (b). Moreover, FIG. 9 is a figure which shows the writing instrument 300 which attached the eraser 30 of 3rd embodiment and accommodated the several writing refill 3 in the inside, FIG. 9 (a) is a top view, FIG.9 (b) is a figure. 9 is a cross-sectional view taken along line IX-IX of 9 (a).

  The eraser 30, like the erasers 10 and 20 of the first and second embodiments, is an eraser 30 attached to the rear end of the writing instrument, and a fitting portion 34 to be fitted with the rear end 301 of the writing instrument 300. And an erasing unit 32. The fitting portion 34 of the present embodiment is formed with the insertion portion 35 so as to be insertable into the hollow portion 302 formed in the rear end portion 301 of the writing instrument 300. The opening of the hollow portion 302 is formed on the outer periphery of the insertion portion 35 A locking rib 37 is formed to be hooked and locked around the portion. Further, the fitting portion 34 protrudes from the side surface of the rear end side in the side direction (direction perpendicular to the front-rear direction (direction C in FIG. 8C), in the direction of arrows E1 and E2 in FIG. 8C). The erasing unit 32 includes the projection 36 and is fixed to the fitting unit 34 by including the projection 36. Further, the rear end portion 38 of the fitting portion 34 according to the present embodiment has a cross-sectional shape viewed from the side as a cross as shown in FIG. 8C by the rear end portion 38 and the projection portion 36. It is formed. The erasing unit 32 encloses the projection 36 of the fitting unit 34 and is further firmly fixed, and the erasing unit 32 is prevented from being detached from the fitting unit 34 during use.

  By forming the fitting portion 34 of this embodiment with a rubber elastic material having a hardness higher than the durometer hardness specified in JIS K 6203, the fitting portion 34 can be easily formed in the hole portion of the rear end portion 301 of the writing instrument 300. Can be inserted.

  The embodiments of the present invention have been described above with reference to the drawings. According to the eraser according to the embodiment of the present invention, since the fitting portion is formed of a material having higher rigidity than the material forming the erasing portion, the possibility of falling off from the rear end portion of the writing instrument is small. In addition, since the erasing unit and the fitting unit are integrally formed by two-color molding, even when the erasing unit is not directly gripped, the risk of the erasing unit falling off is reduced. Moreover, although this embodiment was a writing instrument which accommodated the several writing refill, it is good also as a writing instrument which accommodates the single and the single-color writing refill.

100, 200, 300 Writing implement 101, 201, 301 Back end of writing implement 102 Projection of writing implement 202 Insertion unit of writing implement 302 Hollow part of writing implement 1, 2, 3 Writing refill 10, 20, 30 Eraser 12, 22, 32 Erasing part 14, 24, 34 Fitting part 25 Clip 26 Tube body 27, 37 Locking rib 35 Insertion part 36 Projection part 38 Rear end part

Claims (2)

An eraser attached to the rear end of the writing instrument,
A fitting portion that fits with the rear end portion of the writing instrument;
And an erasing unit fixed to the fitting unit and capable of discoloring or erasing the drawn drawing line,
The fitting portion is formed of a material having higher rigidity than the material forming the erasing portion, and the fitting portion and the erasing portion are integrally formed by two-color molding ,
The erasing unit is fixed to the outer periphery of the fitting unit,
An eraser wherein an inner screw is formed on an inner wall of the fitting portion . A writing instrument comprising the eraser according to claim 1 , wherein a projecting portion is formed at a rear end portion of the writing instrument, an external thread is formed on an outer wall of the projecting portion, and the eraser is the fitting A writing instrument attached via the inner screw of the joint portion and the outer screw of the protrusion .

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