JP2020073342A - Writing instrument with erasing member - Google Patents

Abstract

To provide a writing instrument with an erasing member that can be easily attached.SOLUTION: A writing instrument 1 is provided with an erasing member 2 attached to a rear end section of a writing instrument body 3 or to a front end section of a cap 4. The end section has a fitting section 14 which is disposed on the center axis, and a connection section 15 which connects the end section and the fitting section 14. The erasing member 2 has a fitting hole 2c which receives both the fitting section 14 and the connection section 15. When the erasing member 2 is attached, a gap space 17 is formed around the connection section 15.SELECTED DRAWING: Figure 14

Description

  The present invention relates to a writing instrument including an erasing member.

  There is known a writing instrument including a separate erasing member on the top of a cap, which is capable of erasing a handwriting drawn on a paper surface by the writing instrument with the erasing member (for example, Patent Document 1).

  Further, Patent Document 2 describes an attachment structure for attaching a soft member corresponding to an erasing member to the upper end of a cylinder such as a shaft cylinder or a cap of a writing instrument. According to the mounting structure described in Patent Document 2, the protrusion is provided at the upper end of the tubular body, the mounting hole is provided at the lower end of the erasing member, and the protrusion is inserted into the mounting hole to fit the mounting member. Done.

JP, 2003-2004964, A JP, 2009-214515, A

  Since the writing instrument described in Patent Document 1 is premised on replacement when the erasing member is worn out, the cap and the erasing member are not firmly attached. Therefore, when the handwriting is rubbed using the erasing member, rattling may occur between the cap and the erasing member, and it may be difficult to perform stable erasing.

  On the other hand, according to the mounting structure described in Patent Document 2, although the erasing member can be firmly mounted, the contact area between the outer peripheral surface of the protrusion of the cylindrical body and the inner peripheral surface of the mounting hole of the erasing member. , Increases as the protrusion is inserted into the mounting hole. That is, therefore, the force against the frictional resistance required to insert the protrusion into the mounting hole, that is, the pressure input also increases, and it is difficult to firmly insert the protrusion into the mounting hole.

  An object of the present invention is to provide a writing instrument having an erasing member that can be easily attached. It is another object of the present invention to provide a writing instrument that includes an eraser member that is firmly attached.

  According to one aspect of the present invention, a cap including an erasing member and a shaft tube into which the cap is fitted are provided, and a clip portion is integrally provided on a side surface of the cap via a connecting portion, Provided is a writing instrument, wherein the clip portion is a substantially rectangular plate-shaped member extending in the axial direction.

  In this specification, the writing tip side is defined as the “front” side in the axial direction of the writing instrument, and the side opposite to the writing tip part is defined as the “rear” side. Further, in the axial direction of the cap, the opening end side into which the writing instrument main body is inserted is defined as the “rear” side, and the opposite side is defined as the “front” side.

  According to another aspect, the connecting portion has a T-shaped cross section.

  According to another aspect, the guide surface is formed on the front end surface of the clip portion so that the angle A formed by the paper surface and the central axis of the writing instrument during the erasing operation is in the range of 40 to 80 degrees. ..

  According to another aspect, the cap is made of a material that is harder than a portion of the barrel that fits the cap.

  According to another aspect, the width of the clip portion and the diameter of the cap are substantially the same, and the clip portion extends to the center of gravity of the writing instrument.

  According to each aspect, there is a common effect that a writing instrument provided with an erasing member that can be easily attached is provided. Furthermore, according to each aspect, there is an effect of providing a writing instrument provided with an erase member firmly attached.

1 is a longitudinal sectional view of a writing instrument according to a first embodiment including an erasing member according to an aspect of the present invention. It is a perspective view of the cap of the writing instrument shown in FIG. FIG. 3 is a vertical sectional view of the cap shown in FIG. 2. FIG. 3 is another vertical sectional view of the cap shown in FIG. 2. FIG. 3 is a perspective view of an erasing member of the writing instrument shown in FIG. 1. It is another perspective view of the erasing member of the writing instrument shown in FIG. FIG. 6 is a vertical sectional view of the erasing member shown in FIG. 5. It is a perspective view of the cap to which the erasing member of the writing instrument shown in FIG. 1 is attached. FIG. 9 is a side view of the cap shown in FIG. 8. 9 is a vertical cross-sectional view of the cap shown in FIG. 8 taken along line XX in FIG. 9. FIG. 9 is another vertical sectional view of the cap shown in FIG. 8. 9 is a cross-sectional view of the cap shown in FIG. 8 taken along the line YY in FIG. 9. 9 is a cross-sectional view of the cap shown in FIG. 8 taken along line ZZ in FIG. 9. It is an expanded sectional view which shows the attachment part of the erasing member and cap of the writing instrument shown in FIG. 1. It is a perspective view of the cap of another aspect different from the cap of the writing instrument shown in FIG. FIG. 16 is a vertical sectional view of the cap shown in FIG. 15. FIG. 6 is a perspective view of a cap to which an erasing member of a different mode from the erasing member of the writing instrument shown in FIG. 1 is attached. FIG. 18 is a vertical sectional view of the cap shown in FIG. 17. FIG. 18 is a vertical sectional view of the erasing member shown in FIG. 17. It is a perspective view of the cap to which the erasing member of another mode different from the erasing member of the writing instrument shown in FIG. 1 was attached. FIG. 21 is a perspective view of the erasing member shown in FIG. 20. FIG. 21 is a front view of the erasing member shown in FIG. 20. It is a perspective view of the cap to which the erasing member of another mode different from the erasing member of the writing instrument shown in FIG. 1 was attached. FIG. 24 is a perspective view of the erasing member shown in FIG. 23. FIG. 24 is a front view of the erasing member shown in FIG. 23. It is a perspective view of the cap to which the erasing member of another mode different from the erasing member of the writing instrument shown in FIG. 1 was attached. FIG. 27 is a perspective view of the erasing member shown in FIG. 26. FIG. 27 is a front view of the erasing member shown in FIG. 26. It is a perspective view of the cap to which the erasing member of another mode different from the erasing member of the writing instrument shown in FIG. 1 was attached. FIG. 30 is a perspective view of the erasing member shown in FIG. 29. FIG. 30 is a front view of the erasing member shown in FIG. 29. FIG. 6 is a vertical cross-sectional view of a writing instrument according to a second embodiment including an erasing member according to one aspect of the present invention. FIG. 33 is a perspective view of a cap of the writing instrument shown in FIG. 32. FIG. 34 is a plan view of the cap shown in FIG. 33. FIG. 34 is a side view of the cap shown in FIG. 33. FIG. 34 is a vertical sectional view of the cap shown in FIG. 33. FIG. 34 is a cross-sectional view of the cap shown in FIG. 33 taken along line S-S in FIG. 35. It is a figure which shows the use condition at the time of erasing of the cap to which the erasing member of the writing instrument shown in FIG. 32 was attached.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. Corresponding components are designated by common reference numerals throughout the drawings.

  FIG. 1 is a vertical sectional view of a writing instrument 1 according to a first embodiment including an erasing member 2 according to an aspect of the present invention. The writing instrument 1 is a ball-point pen type writing instrument, and includes a writing instrument body 3 including a refill 5 and a barrel 6 extending in a tubular shape, and a cap 4. The barrel 6 has a tubular front shaft 7 and a rear shaft 8 having a front end screwed to the rear end of the front shaft 7. The front shaft 7 and the rear shaft 8 are made of a resin material. For example, in this embodiment, the front shaft 7 is made of polypropylene resin and the rear shaft 8 is made of polycarbonate resin. By forming the front shaft 7 from a material that is softer than the material of the cap 4 described later, it becomes possible to prevent cracking during fitting. A hole for allowing the writing tip 11 of the refill 5 to project is formed at the front end of the front shaft 7. In the present specification, in the axial direction of the writing instrument 1, the writing tip side is defined as the “front” side, and the side opposite to the writing tip part is defined as the “rear” side. Further, in the axial direction of the cap 4, the opening end side into which the writing instrument main body is inserted is defined as the “rear” side, and the opposite side is defined as the “front” side.

  The refill 5 includes a tubular refill body 9, a joint member 10, a writing tip 11, and a refill plug 12. The refill body 9 is made of, for example, a resin material such as polypropylene or a metal material, and is configured to contain ink. The joint member 10 is formed of a resin material such as polypropylene, polybutylene terephthalate, or polyacetal, or a metal material. The rear end of the writing tip 11 is mounted in the front end of the joint member 10. The refill 5 is housed in the barrel 6, and a part of the writing tip 11 is exposed through the hole of the tip shaft 7 in the state of being housed in the barrel 6. The writing tip portion 11 serving as a writing portion wraps the ball at the tip, and the ink contained in the refill main body 9 is discharged through the joint member 10 in accordance with the rotation of the ball during writing. A refill plug 12 is press-fitted to the rear end portion of the refill body 9 and is fitted by fitting by this press-fitting.

  The cap 4 has a cap body 4 a, a clip portion 4 b, a seal member 13, and an erasing member 2. The cap body 4a is a tubular member, and the clip portion 4b is integrally provided on the side surface thereof. The clip portion 4b is configured to have elasticity so that an article such as a document or clothing can be sandwiched between the clip portion 4b and the cap body 4a. Therefore, as a material for forming the cap body 4a and the clip portion 4b, a synthetic resin such as polycarbonate, acrylonitrile / butadiene / styrene can be used. As described above, it is desirable that the front shaft 7 is made of a harder material.

  The seal member 13 protects the writing tip 11 by engaging the writing tip 11 when the cap 4 is attached to the tip shaft 7 and elastically deforming. Examples of the material forming the seal member 13 include synthetic rubber such as isopropylene rubber, butadiene rubber, nitrile rubber, silicone rubber, butyl rubber, ethylene propylene diene rubber, styrene butadiene rubber, and fluororubber. In particular, butyl rubber (IIR) can further improve the processability and the volatilization prevention performance of the tip of the writing part. That is, butyl rubber is not only excellent in processability, but also particularly excellent in airtightness (gas barrier property) among various rubbers. Therefore, by forming the seal member from butyl rubber, it is possible to more reliably prevent the writing tip portion from drying and prevent the solvent component in the ink from volatilizing.

  Next, the structure of the cap 4 will be described with reference to FIGS. 2 to 4. 2 is a perspective view of the cap 4 of the writing instrument shown in FIG. 1, FIG. 3 is a vertical sectional view of the cap 4 shown in FIG. 2, and FIG. 4 is a cap shown in FIG. 4 is another vertical cross-sectional view of FIG. 4 is a cross-sectional view at a position rotated by 90 degrees around the central axis with respect to the cross-sectional view shown in FIG.

  An engagement portion 4c that engages with the tip shaft 7 is provided on the inner wall near the opening end of the cap body 4a. Three or more ribs 4e extending in the axial direction of the writing instrument 1 are provided at equal intervals in the circumferential direction inside the front end 4d of the cap body 4a, that is, inside the vicinity of the top. In this aspect, the cap body 4a has six ribs 4e. As shown in FIG. 1, the seal member 13 is sandwiched by the ribs 4e.

  The ribs 4e have the same axial length, but only two ribs (long ribs) 4f arranged to face the central axis extend longer toward the rear of the cap 4 than the other ribs 4e. May be. These long ribs 4f serve as a guide when the seal member 13 is inserted when the cap 4 is assembled, and facilitate the insertion. When the cap 4 is made of a transparent or translucent material, one of the long ribs 4f may be arranged at a position corresponding to the position just below the clip portion 4b extending in the longitudinal direction. As a result, the clip portion 4b and the opposing long rib 4f are arranged on substantially the same plane passing through the center axis of the cap 4, and a aesthetic feeling is produced.

  At the front end portion 4d of the cap body 4a, a fitting portion 14 arranged on the central axis, two connecting portions 15 connecting the end portion 4d and the fitting portion 14, the fitting portion 14, and the connecting portion. A support wall 16 arranged around 15 is provided. Further, although a circular ventilation opening 4g is provided around the central axis at the front end portion 4d of the cap body 4a, the ventilation opening 4g may be omitted.

  The fitting portion 14 has a truncated cone shape whose rear end has a larger diameter and whose diameter decreases toward the front end. The front end surface edge portion 14a of the fitting portion 14 is rounded and chamfered. Further, the rear end face edge portion 14b portion has a corner portion 14c of 90 degrees or an acute angle. The shape of the fitting portion 14 is not limited to the truncated cone shape, and may be a sphere, a cylinder, a polygonal truncated cone shape, or the like.

  The connecting portions 15 are two columnar members extending from the inner wall of the ventilation opening 4g toward the front of the cap 4, and are arranged symmetrically with respect to the central axis of the cap 4. The fitting portion 14 is supported by the connecting portion 15 so that its disc-shaped surface is perpendicular to the central axis of the cap 4. The fitting portion 14 is supported by the connecting portion 15 on the rear end face and near the edge thereof. As is apparent from FIG. 3, the connecting portion 15 does not extend along the central axis, but extends slightly inclined toward the central axis as it goes forward. Since the cap body 4a has a ventilation opening and the two connecting portions 15 are separated from each other, air can flow from the front end to the rear end of the cap body 4a.

  In this aspect, the cap body 4a, the fitting portion 14, and the connecting portion 15 are integrally formed, but they may be formed separately. Further, in this aspect, the number of the connecting portions 15 is two, but the number may be one or three or more. When there is one connecting portion 15, the connecting portion 15 is connected near the center of the facing surface of the fitting portion 14. Further, when the vent opening 4g is not provided at the front end 4d of the cap body 4a, it is configured to extend forward from the front end 4d of the cap body 4a.

  The support wall 16 is a tubular member arranged around the fitting portion 14 and the connecting portion 15. The outer peripheral surface of the support wall 16 is formed flush with the outer peripheral surface of the cap body 4a. In this aspect, the cap body 4a and the support wall 16 are integrally formed, but they may be separately formed. The support wall 16 has an inner peripheral surface 16a into which the insertion portion 2a of the erasing member 2 is fitted, as described later.

  Next, the structure of the erasing member 2 will be described with reference to FIGS. 5 is a perspective view of the erasing member 2 of the writing instrument 1 shown in FIG. 1, FIG. 6 is another perspective view of the erasing member 2 of the writing instrument 1 shown in FIG. 1, and FIG. FIG. 6 is a vertical sectional view of the erasing member 2 shown in FIG. 5.

  The erasing member 2 is inserted between the support walls 16 of the cap body 4a and is surrounded by the inserting portion 2a, and is used to expose the erasing member 2 to the outside when the erasing member 2 is attached to the cap and scrape the paper surface and the like. The erasing portion 2b is provided with a fitting hole 2c extending in the axial direction and penetrating the inserting portion 2a and the erasing portion 2b. The insertion portion 2a and the erasing portion 2b may be integrally formed. As a material for forming the erasing member 2, a rubber material such as silicone rubber, nitrile rubber, ethylene propylene rubber or ethylene propylene diene rubber, or a rubber elastic material such as thermoplastic elastomer such as styrene elastomer, olefin elastomer or polyester elastomer, 2 Examples thereof include a mixture of one or more elastic materials, a mixture of a rubber elastic material and a synthetic resin, and a commercially available eraser.

  The insertion portion 2a has a substantially columnar shape corresponding to the shape of the inner peripheral surface 16a of the support wall 16 of the cap body 4a, and has an annular engagement protrusion 2d on the side surface in the circumferential direction. The engagement projection 2d is held in contact with the inner peripheral surface 16a of the support wall 16 so that the erasing member 2 does not rattle when attached to the cap 4. It should be noted that a plurality of protrusions may be formed in the circumferential direction instead of the annular engagement protrusion 2d. Further, as long as the rattling of the erasing member 2 can be prevented by other means, the engaging protrusion 2d may not be provided.

  Moreover, you may provide the flat part 2e along the axial direction at a part of side surface of the insertion part 2a. When the erasing member 2 is formed by injection molding, the flat portion 2e can be the gate position at the time of molding. As a result, even if a gate residue is generated on the flat portion 2e after molding, there is a clearance between the surface of the flat portion 2e and the inner peripheral surface 16a of the support wall 16 of the cap body 4a. It is possible to prevent contact with the inner peripheral surface. Further, as will be described later, by providing the projections corresponding to the inner peripheral surface 16a of the support wall 16, it is possible to position in a predetermined direction at the time of mounting, and to prevent the erasing member 2 from rotating after mounting. it can.

  The erasing portion 2b has a truncated cone shape whose rear end has a larger diameter and whose diameter decreases toward the front end. The front end surface edge portion of the erasing portion 2b is rounded and chamfered. The rear end portion of the erasing portion 2b has a larger diameter than the insertion portion 2a, and thus forms a stepped jaw portion 2f with the insertion portion 2a. When the erasing member 2 is attached to the cap, the rear end surface of the jaw 2f contacts the front end surface 16b of the support wall 16.

  The fitting hole 2c extends in the axial direction and penetrates the insertion portion 2a and the erasing portion 2b. The fitting hole 2c receives the fitting portion 14 and the connecting portion 15 of the cap 4 when the erasing member 2 is attached to the cap 4. The fitting hole 2c is divided into a taper portion 2g, a small diameter portion 2h, and a large diameter portion 2i in order from the rear end portion where the fitting portion 14 is inserted, that is, the inlet portion. The taper portion 2g has a taper shape that becomes thinner from the rear end portion of the fitting hole 2c toward the front, that is, becomes thinner from the inlet portion toward the back. The inner diameter of the front end of the tapered portion 2g and the inner diameter of the rear end of the small diameter portion 2h are set to be substantially equal. The boundary between the small-diameter portion 2h and the large-diameter portion 2i has a step shape, and forms a locking portion 2j that prevents the fitting portion 14 from coming off, as will be described later. The small diameter portion 2h may be omitted.

  In this mode, since the fitting hole 2c penetrates, even if the erasing member 2 comes off the cap after the product is shipped and an infant or the like swallows it, it is possible to ensure safety without blocking the airway. It will be possible.

  Next, attachment of the erasing member 2 and the cap 4 will be described with reference to FIGS. 8 to 14. 8 is a perspective view of the cap 4 to which the erasing member 2 of the writing instrument 1 shown in FIG. 1 is attached, FIG. 9 is a side view of the cap 4 shown in FIG. 8, and FIG. 9 is a vertical sectional view of the cap 4 shown in FIG. 8 taken along line XX in FIG. 9, FIG. 11 is another vertical sectional view of the cap 4 shown in FIG. 8, and FIG. 14 is a cross-sectional view of the cap 4 shown in FIG. 9 taken along line YY of FIG. 9, and FIG. 13 is a cross-sectional view of the cap 4 shown in FIG. 8 taken along line ZZ of FIG. FIG. 3 is an enlarged cross-sectional view showing a portion where the erasing member 2 and the cap 4 of the writing instrument 1 shown in FIG. 1 are attached. 11 is a cross-sectional view at a position rotated by 90 degrees around the central axis with respect to the cross-sectional view shown in FIG.

  When the erasing member 2 is inserted between the support walls 16 of the cap body 4a, the fitting portion 14 is inserted into the fitting hole 2c of the erasing member 2 and the outer peripheral surface of the inserting portion 2a of the erasing member 2 is supported by the supporting wall 16. Is guided along the inner surface of the. The fitting portion 14 passes through the taper portion 2g and the small diameter portion 2h of the fitting hole 2c and beyond the locking portion 2j, and the rear end surface of the jaw 2f of the erasing member 2 becomes the front end surface 16b of the support wall 16. Upon contact, the mounting of the erasing member 2 is completed.

  The maximum outer diameter of the fitting portion 14 is set to be larger than the minimum inner diameter of the tapered portion 2g of the fitting hole 2c, that is, the inner diameter of the small diameter portion 2h and equal to or smaller than the inner diameter of the large diameter portion 2i. .. Therefore, when the fitting portion 14 passes through the tapered portion 2g and the small diameter portion 2h of the fitting hole 2c, the fitting portion 14 or the insertion portion 2a of the erasing member 2 is elastically deformed.

  The front end edge 14a of the fitting portion 14 is chamfered in a round shape, and the entrance portion at the time of insertion into the fitting hole 2c is a tapered taper portion 2g. Insertion is done smoothly. Further, during insertion of the fitting portion 14 into the fitting hole 2c, only the outer peripheral surface 14d of the fitting portion 14 moves within the fitting hole 2c while contacting the inner peripheral surface 2k of the fitting hole 2c. There is. That is, the pressing force required for insertion largely depends on the frictional force between the outer peripheral surface 14d of the fitting portion 14 and the inner peripheral surface 2k of the fitting hole 2c, but the contact area between these is substantially constant. , The pressure input required during insertion is also almost constant. Therefore, the erasing member 2 can be easily attached to the cap.

  Here, the inner diameters of the tapered portion 2g and the small diameter portion 2h of the fitting hole 2c are set so as to include or abut the two connection portions 15 in the state where the attachment is completed. That is, as described above, the two connecting portions 15 extend so as to incline toward the central axis as they go forward, and this inclination is equal to or larger than the inclination of the tapered portion 2g of the fitting hole 2c. Set. Therefore, the connecting portion 15 does not contact the inner peripheral surface 2k of the fitting hole 2c during the mounting of the erasing member 2. On the other hand, by setting the inclinations of both to be equal, the two connecting portions 15 can be inscribed in the inner peripheral surface of the tapered portion 2g when the attachment is completed. As a result, the erasing member 2 can be firmly attached without rattling.

  As is clear from the relationship between the connecting portion 15 and the inner peripheral surface 2k of the fitting hole 2c, the fitting portion 14 is supported by the columnar connecting portion 15 in the insertion such that the contact area is substantially constant. It is realized by the existence of the interstitial space 17 around the connecting portion 15, which is formed from the above. The clearance space 17 is defined by the fitting portion 14, the connecting portion 15, and the inner peripheral surface 2k of the fitting hole 2c of the erasing member 2. The presence of the clearance space 17 reduces frictional resistance during the attachment of the erasing member 2 to the cap, and enables easy attachment.

  In the state where the fitting is completed, the fitting portion 14 is slightly separated from the step-like locking portion 2j provided in the fitting hole 2c of the erasing member 2 in the axial direction. Similarly, the rear end surface of the insertion portion 2a of the erasing member 2 is also slightly separated from the front end portion 4d of the cap body 4a in the axial direction. The engaging projection 2d provided on the side surface of the insertion portion 2a of the erasing member 2 elastically deforms to engage with the inner peripheral surface 16a of the support wall 16, making it difficult for the erasing member 2 to come off. Further, in order to secure the engagement between the engagement protrusion 2d and the inner peripheral surface 16a of the support wall 16, the inner periphery of the support wall 16 at the position corresponding to the engagement protrusion 2d after the attachment is completed. The surface may be provided with a concave portion 16c having a shape corresponding to the engaging projection.

  When the attachment is completed, the elastic deformation of the fitting portion 14 or the insertion portion 2a of the erasing member 2 at the time of attachment is restored. Therefore, when the erasing member 2 is to be pulled out from the cap 4 for the purpose of replacing the erasing member 2, the front end surface of the locking portion 2j of the erasing member 2 and the corner portion 14c of the rear end surface of the fitting portion 14 are engaged. And inhibit it. Therefore, in order to pull out the erasing member 2 from the cap 4, it is necessary to apply a stronger force. Thereby, the engagement is released by elastically deforming the locking portion 2j or the corner portion 14c, and the erasing member 2 can be pulled out from the cap 4.

  The pulling force required to pull the erasing member 2 out of the cap 4 is preferably designed to be greater than the force input required to attach the erasing member 2 to the cap 4. This can be realized, for example, by adjusting the inclination or minimum inner diameter of the tapered portion 2g of the fitting hole 2c, the maximum outer diameter of the fitting portion 14, or the like.

  The fitting hole 2c of the erasing member 2 may have only the tapered portion 2g and not the small diameter portion 2h and the large diameter portion 2i, that is, the locking portion 2j. In this case, the fitting portion 14 is engaged by frictional resistance between the outer peripheral surface 14d and the inner peripheral surface of the tapered portion 2g of the fitting hole 2c.

  Here, the writing instrument 1 according to one embodiment of the present invention shown in FIG. 1 uses a thermochromic ink as the ink. Thermochromic ink is a color that maintains a predetermined color (first color) at room temperature (for example, 25 ° C.) and changes to another color (second color) when heated to a predetermined temperature (for example, 60 ° C.). After that, when cooled to a predetermined temperature (for example, −5 ° C.), the ink has a property of returning to the original color (first color) again. In the writing instrument 1 using the thermochromic ink, the second color is made colorless, and the drawing line drawn in the first color (for example, red) is heated to make it colorless, which is referred to as “erasing” here. .. Therefore, in this embodiment, the erasing member 2 rubs against the paper surface on which the drawn line is written to generate frictional heat, thereby changing the drawn line to colorless, that is, erasing. Of course, the second color may be a color other than colorless.

  The term "erasing" in the present invention means, other than the case where the thermochromic ink is used, that a drawn line, a character, or the like is adsorbed or scraped off by an erasing member 2 such as an eraser. Therefore, the above aspects and the following aspects of the present invention can be applied to any writing instrument that erases a drawn line using the erasing member 2.

  Hereinafter, a writing instrument according to another aspect of the present invention will be described. Since the writing instrument main body is similar to the above-described aspect, description thereof will be omitted, and only the points different from the above-described aspect will be described.

  FIG. 15 is a perspective view of a cap 24 different from the cap 4 of the writing instrument 1 shown in FIG. 1, and FIG. 16 is a vertical cross-sectional view of the cap 24 shown in FIG. The cap 24 shown in FIGS. 15 and 16 differs from the cap 4 shown in FIGS. 2 to 4 only in that it has a positioning protrusion 24h. The positioning protrusion 24h has a shape complementary to the flat portion 2e provided on the insertion portion 2a of the erasing member 2 when the erasing member 2 is attached to the cap 24. Since the cap 24 has the positioning protrusion 24h, it becomes possible to position the erasing member 2 in a predetermined direction at the time of mounting, and it is possible to prevent the erasing member 2 from rotating after mounting. When the cap 24 is made of a transparent or semi-transparent material, the positioning protrusion 24h is arranged on the inner peripheral surface 16a of the support wall 16 on the side where the clip portion 4b is located, in a line with the clip portion 4b. It is preferable because it causes a beautiful feeling.

  17 is a perspective view of a cap 24 to which an erasing member 22 of a different form from the erasing member 2 of the writing instrument shown in FIG. 1 is attached, and FIG. 18 is a vertical section of the cap 24 shown in FIG. FIG. 19 is a plan view, and FIG. 19 is a vertical cross-sectional view of the erasing member 22 shown in FIG. 17.

  In this embodiment, the cap 24 is the one shown in FIGS. 15 and 16. The erasing member 22 is different from the erasing member 2 shown in FIGS. 5 to 7 in that the fitting hole 22c does not penetrate to the erasing portion 22b. That is, although the fitting hole 22c is illustrated in a simplified manner in the drawing, it has at least a taper portion, a locking portion, and a large diameter portion in the insertion portion 22a, and the axial length of the large diameter portion is The length is set to receive the fitting portion 14 and the connecting portion 15 of the cap. Note that, as described above, the fitting hole 22c may have only the tapered portion.

  A concave curved surface-shaped concave portion 22m is provided on the front end surface of the erasing portion 22b. Since the recess 22m is provided on the front end surface of the erasing portion 22b, it is possible to erase a minute portion using the edge of the recess 22m. In addition, by holding the erasing member 22 perpendicularly to the paper surface or the like on which the drawn line is written, the erasing member 22 reduces the frictional resistance as compared with the case where the front end surface of the erasing portion is formed in a convex curved surface, and smooths. In addition, it is possible to erase a wide range.

  20 is a perspective view of the cap 24 to which an erasing member 32 of another mode different from the erasing member 2 of the writing instrument shown in FIG. 1 is attached, and FIG. 21 is an erasing member 32 shown in FIG. 22 is a front view of the erasing member 32 shown in FIG. 20.

  In this embodiment, the cap 24 is the one shown in FIGS. 15 and 16. The erasing member 32 is the same as the erasing member 2 shown in FIGS. 5 to 7 with respect to the insertion portion 2a and the fitting hole 2c, and differs only in the outer shape of the erasing portion 32b. The eraser 32b has a cross-sectional shape that is circular on the rear end face, but has an outer shape that changes to an elliptic shape in which the ratio of the major axis to the minor axis gradually increases from the rear end surface toward the front end surface. Have The length of the major axis of the ellipse on the front end face of the erasing portion 32b is shorter than the circular diameter of the rear end face of the erasing portion 32b. By making the cross-sectional shape of the erasing portion 32b an elliptical shape, the major axis direction is parallel to the paper surface or the like, or the minor axis direction is parallel to the paper surface or the like when erasing a drawing line or the like, or It is possible to realize different erasing widths, that is, areas that can be rubbed at one time, depending on whether or not it is in the middle.

  23 is a perspective view of the cap 24 to which an erasing member 42 of another mode different from the erasing member 2 of the writing instrument shown in FIG. 1 is attached, and FIG. 24 is an erasing member 42 shown in FIG. FIG. 25 is a front view of the erasing member 42 shown in FIG. 23.

  In this embodiment, the cap 24 is the one shown in FIGS. 15 and 16. The erasing member 42 is the same as the erasing member 2 shown in FIGS. 5 to 7 with respect to the insertion portion 2a and the fitting hole 2c, and differs only in the outer shape of the erasing portion 42b. The cross section of the erasing portion 42b has a circular shape on the rear end surface, but has a hexagonal shape on the front end surface, and has an outer shape that gradually changes from a circular shape to a hexagonal shape from the rear end surface to the front end surface. Have The hexagonal shape of the front end surface of the erasing portion 42b is rounded and chamfered at its corners, and preferably one side of the hexagonal shape is formed so as to be parallel to the flat portion 2e of the insertion portion 2a. Since the front end surface of the erasing portion 2b has a hexagonal shape, it is possible to erase a minute portion by utilizing the side portion 42n and the corner portion 42o. The shape of the front end face of the erasing portion 42b is not limited to a hexagon, and may be another polygon such as a triangle or a quadrangle.

  26 is a perspective view of the cap 24 to which an erasing member 52 of another mode different from the erasing member 2 of the writing instrument shown in FIG. 1 is attached, and FIG. 27 is an erasing member 52 shown in FIG. 28 is a front view of the erasing member 52 shown in FIG. 26.

  In this embodiment, the cap 24 is the one shown in FIGS. 15 and 16. The erasing member 52 is the same as the erasing member 2 shown in FIGS. 5 to 7 with respect to the insertion portion 2a and the fitting hole 2c, and is different only in the outer shape of the erasing portion 52b. In the erasing section 52b, when considering a vertically divided half body, the first half body 52p has a truncated cone shape and the second half body 52q has a hexagonal truncated pyramid shape. The flat portion 2e positioned by the positioning protrusion 24h of the cap body 4a is provided on the first half body 52p side of the insertion portion 2a so that the first half body is arranged on the clip portion 4b side of the cap 24. There is.

  By disposing the first half body 52p on the clip portion 4b side of the cap, the hexagonal truncated pyramid-shaped surface of the second half body 52q can be easily used. That is, normally, when the user holds the cap 24 and performs the erasing operation, the index finger and the thumb are arranged on the outer peripheral surface of the cap body 4a on both sides thereof so as to avoid the clip portion 4b, and the side where the clip portion 4b is located is The middle finger is placed on the outer peripheral surface of the cap body 4a on the opposite side to grip the cap 24. Therefore, in this gripping state, the hexagonal truncated pyramid-shaped surface of the second half body 52q faces the paper surface.

  The first half 52p has the same shape as the erasing portion 2b shown in FIGS. 5 to 7. Since the second half body 52q is a hexagonal truncated pyramid-shaped half body, it has three plane portions 52r. Therefore, by erasing at the first half 52p portion of the erasing section 52b, erasing on a narrow surface becomes possible. On the other hand, when erasing with the second half 52q portion of the erasing section 52b, by using each flat surface portion 52r, it is possible to erase with a wider surface than when using the first half body 52p. Further, by using the mountain portion 52s which is the connecting portion of each plane portion or the connecting portion 52t of the mountain portion and the front end face, it is possible to erase a finer portion.

  29 is a perspective view of the cap 24 to which an erasing member 62 of another mode different from the erasing member 2 of the writing instrument shown in FIG. 1 is attached, and FIG. 30 is an erasing member 62 shown in FIG. FIG. 31 is a front view of the erasing member 62 shown in FIG. 29.

  In this embodiment, the cap 24 is the one shown in FIGS. 15 and 16. The erasing member 62 is the same as the erasing member 2 shown in FIGS. 5 to 7 with respect to the insertion portion 2a and the fitting hole 2c, and differs only in the outer shape of the erasing portion 62b. The erasing section 62b has a configuration in which the surfaces on both sides of the second half body 52q shown in FIGS. 26 to 28 are replaced by the truncated cone shape of the first half body 52p. Therefore, the erasing portion 62b includes a truncated cone-shaped portion 62u and a hexagonal truncated pyramid-shaped portion 62v. The flat portion 2e positioned by the positioning protrusion 24h of the cap body 4a is provided on the truncated cone-shaped portion 62u side of the insertion portion 2a so that the truncated cone-shaped portion 62u is arranged on the clip portion 4b side of the cap 24. ing.

  By arranging the truncated cone-shaped portion 62u on the clip portion 4b side of the cap 24, the surface of the hexagonal truncated pyramid-shaped portion 62v can be easily used. That is, normally, when the user holds the cap 24 and performs the erasing operation, the index finger and the thumb are arranged on the outer peripheral surface of the cap body 4a on both sides thereof so as to avoid the clip portion 4b, and the side where the clip portion 4b is located is The middle finger is placed on the outer peripheral surface of the cap body 4a on the opposite side to grip the cap 24. Therefore, in this gripped state, the surface of the hexagonal frustum-shaped portion 62v faces the paper surface.

  By erasing with the truncated cone-shaped portion 62u of the erasing section 62b, erasing on a narrow surface becomes possible. On the other hand, when erasing with the hexagonal frustum-shaped portion 62v of the erasing portion 62b, by using one surface, it is possible to erase with a wider surface than when using the truncated cone-shaped portion 62u. Further, by using the mountain portion 62w which is the connecting portion of each surface or the connecting portion 62x of the mountain portion 62w and the front end surface, it is possible to erase a finer portion.

  Although the above-described aspect of the erasing member of the present invention attaches the erasing member to the front end portion of the cap, it can be similarly applied to the rear end portion of the writing instrument body.

  FIG. 32 is a vertical cross-sectional view of the writing instrument 100 according to the second embodiment including the erasing member 2 according to one aspect of the present invention. The writing instrument 100 is a ball-point pen type writing instrument, and includes a writing instrument body 3 including a refill 5 and a barrel 6 extending in a tubular shape, and a cap 104. The barrel 6 has a tubular front shaft 7 and a rear shaft 8 having a front end screwed to the rear end of the front shaft 7. The writing instrument 100 according to the present embodiment differs from the writing instrument 1 according to the first embodiment described above only in the outer shape of the cap, particularly in the shape of the clip portion. Therefore, in the following description, particularly the clip portion will be described, and description of the other portions will be omitted. Note that the cap 104 can be configured such that an erasing member attached to the cap 4 shown in FIG. 4 can be attached, and for example, an erasing member attached to the cap 24 shown in FIG. 15 can be attached. It is also possible to configure.

  33 is a perspective view of the cap 104 of the writing instrument 100 shown in FIG. 32, FIG. 34 is a plan view of the cap 104 shown in FIG. 33, and FIG. 35 is a cap shown in FIG. 36 is a side view of FIG. 104, FIG. 36 is a vertical cross-sectional view of the cap 104 shown in FIG. 33, and FIG. 37 is a cross-sectional view of the cap 104 shown in FIG. is there.

  The cap 104 has a cap body 104a, a clip portion 104b, and the erasing member 2 in the present embodiment. The cap body 104a is a tubular member, and a clip portion 104b is integrally provided on a side surface of the cap body 104a via a connecting portion 104c. The clip portion 104b is configured to have elasticity so that an article such as a document or clothing can be sandwiched between the clip portion 104b and the cap body 104a. Therefore, as a material for forming the cap body 104a and the clip portion 104b, a synthetic resin such as polycarbonate, acrylonitrile-butadiene-styrene, etc. may be mentioned. As described above, it is desirable that the front shaft 7 is made of a harder material.

  A feature of the cap 104 is that the clip portion 104b is a substantially rectangular plate-shaped member that extends in the axial direction over substantially the entire length of the clip body 104a. As shown in FIG. 34, the rear end surface of the clip portion 104b is formed into a curved surface so that the hand feels good. A guide surface 104d, which is a plane perpendicular to the central axis, is formed in the central portion of the front end surface of the clip portion 104b, and the front end surfaces on both sides of the guide surface 104d are formed in a curved shape like the rear end surface. Each edge of the clip portion 104b is chamfered. The guide surface 104d does not have to be perpendicular to the central axis. For example, as will be described later with reference to FIG. 38, it may be an inclined surface that matches the paper surface facing at the time of erasing.

  The width W of the clip portion 104b is substantially the same as the diameter of the tubular cap body 104a, as is apparent from the plan view of FIG. Therefore, from this viewpoint of the user, the cap body 104a is almost hidden by the clip portion 104b, and only the clip portion 104b and the erasing member 2 can be visually recognized. That is, the clip portion 104b of the cap 104 has a wider, wider, and smoother surface than the conventional clip portion, for example, the clip portion 4b of the cap 4 shown in FIG. Therefore, by applying decoration such as transfer printing to the surface, it is possible to enhance the design and enhance the appeal to the user. Further, by attaching a rubber elastic material such as rubber or elastomer to the surface, an erasing surface wider than the erasing member 2 is formed, so that it is possible to properly use the area to be erased.

  The connecting portion 104c that connects the cap main body 104a and the clip portion 104b has a T-shaped cross-sectional shape, as shown in FIG. Therefore, the strength of the clip portion 104b against the circumferential force (vertical direction in FIG. 37) is increased. Therefore, even when a circumferential force is applied to the clip portion 104b during use by the user, the connection portion 104c is prevented from being damaged.

  FIG. 38 is a view showing a use state at the time of erasing the cap 104 to which the erasing member 2 of the writing instrument 100 shown in FIG. 32 is attached. As shown in FIG. 38, at the time of erasing, by pushing the flat guide surface 104d of the clip portion 104b against the paper surface and sliding the cap 104 along the guide surface 104d, it is possible to erase the handwriting with a constant width. Become. At this time, if the cap 104 is slid while pressing the guide surface 104d of the clip portion 104b against a guide member such as a ruler J, a more stable erasing operation becomes possible, and erasing over a long range with a constant width is facilitated. It becomes possible to do it. Furthermore, by sliding the cap 104 while pressing the guide surface 104d of the clip portion 104b against the paper surface and abutting the wide surface of 104b against the slope Ja provided on the ruler J, a more stable erasing operation can be performed. It will be possible.

  Further, by adjusting the shape of the erasing member 2, the axial position of the clip portion 104b with respect to the cap body 104a, the shape of the guide surface 104d, and the like, the angle A formed between the paper surface and the central axis of the writing instrument 100 during the erasing operation is adjusted. can do. This angle A is preferably in the range of 40 to 80 degrees.

  In addition to the effects described above, since the width W of the clip portion 104b and the diameter of the cap body 104a are substantially the same, when the writing instrument 100 is placed on a desk or the like with the wide plane of the clip portion 104b facing up, for example, the writing instrument As the 100 rotates, the side surface of the clip portion 104b comes into contact with a desk or the like, and the writing instrument 100 can be maintained in a state of being right next to it. Therefore, there is an effect that the barrel 6 is easily gripped when the writing instrument 100 is picked up. In addition, rolling of the writing instrument 100 can always be prevented.

  Further, the clip portion 104b is extended to the center of gravity of the writing instrument, and the cap 104 has the clip portion 104b having the above-described structure. For example, the writing instrument 100 is placed on a desk or the like with the wide plane of the clip portion 104b facing down. In this case, the rear end of the writing instrument 100 can be stabilized in a floating state without being grounded on the desk. Therefore, there is an effect that the barrel 6 is easily gripped when the writing instrument 100 is picked up.

  The structure of the clip portion 104b described in the present embodiment can be applied not only to the cap but also to the attachment to the front shaft and the rear shaft.

DESCRIPTION OF SYMBOLS 1 Writing instrument 2 Erasing member 2c Fitting hole 3 Writing instrument main body 4 Cap 14 Fitting part 15 Connection part 16 Support wall 17 Gap space

Claims (3)

A writing instrument comprising an erasing member attached to the rear end of the writing instrument body or the front end of the cap,
The erasing member includes a first half and a second half that are vertically divided, and the first half is a half that is obtained by vertically dividing a truncated cone shape, and the second half is Is a half body that vertically divides a hexagonal truncated pyramid shape consisting of a front end face, a plurality of flat portions, a mountain portion and a connecting portion, and the mountain portion is a connecting portion of each of the planar portions, and the connecting portion. Is a connecting portion of the mountain portion and the front end surface, and a writing instrument provided with an erasing member.   The writing instrument with an erasing member according to claim 1, wherein the first half body is disposed on a side of a clip portion provided on the writing instrument body or the cap.   3. The erasing member according to claim 1, wherein a flat portion positioned by a positioning protrusion provided on the writing instrument main body or the cap is provided on the first half body side of the erasing member. Writing instrument provided.

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