JP2021167113A - 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 provided with an erasing member.

A writing instrument having a separate erasing member on the top of the cap, and a writing instrument capable of erasing handwriting drawn on a paper surface or the like by the writing instrument, is known (for example, Patent Document 1).

Further, Patent Document 2 describes an attachment structure for attaching a soft member corresponding to an erasing member to an upper end portion 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, a protrusion is provided at the upper end of the cylinder, a mounting hole is provided at the lower end of the erasing member, and the protrusion is inserted into the mounting hole for fitting. Will be done.

Japanese Unexamined Patent Publication No. 2003-200394 Japanese Unexamined Patent Publication No. 2009-214515

Since the writing tool described in Patent Document 1 is premised on being replaced when the erasing member is worn out, the cap and the erasing member are not firmly attached. Therefore, when the handwriting is rubbed with the erasing member, rattling may occur between the cap and the erasing member, and it may be difficult to stably erase the handwriting.

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 cylinder and the inner peripheral surface of the mounting hole of the erasing member. However, it increases as the protrusion is inserted into the mounting hole. That is, therefore, the force against the frictional resistance required for inserting the protrusion into the mounting hole, that is, the pressure input also increases accordingly, and it is difficult to firmly insert the protrusion into the mounting hole.

An object of the present invention is to provide a writing tool provided with an erasing member that can be easily attached. Another object of the present invention is to provide a writing tool provided with a firmly attached erasing member.

According to one aspect of the present invention, a cap provided with an erasing member and a shaft cylinder 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 tool characterized in that the clip portion is a substantially rectangular plate-shaped member extending in the axial direction.

In the present specification, in the axial direction of the writing instrument, the writing tip side is defined as the "front" side, and the side opposite to the writing tip is defined as the "rear" side. Further, in the axial direction of the cap, the end side at which the writing tool body is inserted is defined as the "rear" side, and the opposite side is defined as the "front" side.

Further, according to another aspect, the connecting portion has a T-shaped cross-sectional shape.

Further, according to another aspect, a 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. ..

Further, according to another aspect, the cap is made of a material harder than the portion of the barrel into which the cap fits.

Further, 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 position of the center of gravity of the writing tool.

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

It is a vertical sectional view of the writing instrument according to 1st Embodiment provided with the erasing member according to one aspect of this invention. It is a perspective view of the cap of the writing instrument shown in FIG. It is a vertical sectional view of the cap shown in FIG. It is another vertical sectional view of the cap shown in FIG. It is a perspective view of the erasing member of the writing instrument shown in FIG. It is another perspective view of the erasing member of the writing instrument shown in FIG. It is a vertical sectional view of the erasing member shown in FIG. It is a perspective view of the cap to which the erasing member of the writing instrument shown in FIG. 1 is attached. It is a side view of the cap shown in FIG. It is a vertical cross-sectional view of the cap shown in FIG. 8 in line XX of FIG. FIG. 8 is another vertical cross-sectional view of the cap shown in FIG. It is a cross-sectional view of the cap shown in FIG. 8 in line YY of FIG. It is a cross-sectional view of the cap shown in FIG. 8 in line ZZ of FIG. It is an enlarged cross-sectional view which shows the attachment part of the erasing member of the writing instrument shown in FIG. 1 and the cap. It is a perspective view of the cap of a mode different from the cap of the writing instrument shown in FIG. FIG. 15 is a vertical cross-sectional view of the cap shown in FIG. It is a perspective view of the cap to which the erasing member of a mode different from the erasing member of the writing instrument shown in FIG. 1 is attached. It is a vertical sectional view of the cap shown in FIG. It is a vertical sectional view of the erasing member shown in FIG. It is a perspective view of the cap to which the erasing member of another aspect from the erasing member of the writing instrument shown in FIG. 1 is attached. It is a perspective view of the erasing member shown in FIG. It is a front view of the erasing member shown in FIG. It is a perspective view of the cap to which the erasing member of another aspect from the erasing member of the writing instrument shown in FIG. 1 is attached. It is a perspective view of the erasing member shown in FIG. It is a front view of the erasing member shown in FIG. It is a perspective view of the cap to which the erasing member of another aspect from the erasing member of the writing instrument shown in FIG. 1 is attached. It is a perspective view of the erasing member shown in FIG. It is a front view of the erasing member shown in FIG. It is a perspective view of the cap to which the erasing member of another aspect from the erasing member of the writing instrument shown in FIG. 1 is attached. It is a perspective view of the erasing member shown in FIG. It is a front view of the erasing member shown in FIG. It is a vertical sectional view of the writing instrument according to the 2nd Embodiment provided with the erasing member according to 1 aspect of this invention. It is a perspective view of the cap of the writing instrument shown in FIG. 32. FIG. 3 is a plan view of the cap shown in FIG. 33. It is a side view of the cap shown in FIG. 33. FIG. 3 is a vertical cross-sectional view of the cap shown in FIG. 33. FIG. 3 is a cross-sectional view taken along the line SS of FIG. 35 of the cap shown in FIG. 33. It is a figure which shows the use state at the time of erasing the cap to which the erasing member of the writing instrument shown in FIG. 32 is attached.

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

FIG. 1 is a vertical cross-sectional view of a writing tool 1 according to a first embodiment provided with an erasing member 2 according to an aspect of the present invention. The writing tool 1 is a ballpoint pen type writing tool, and has a writing tool main body 3 having a refill 5 and a cylinder 6 extending in a cylindrical shape, and a cap 4. The axle cylinder 6 has a cylindrical front shaft 7 and a rear shaft 8 whose front end is screwed onto the rear end of the front shaft 7. The front shaft 7 and the rear shaft 8 are formed of a resin material. For example, in this aspect, the front axle 7 is made of polypropylene resin and the rear axle 8 is made of polycarbonate resin. By forming the toe shaft 7 from a material softer than the material of the cap 4 described later, it is possible to prevent cracking at the time of fitting. At the front end of the front shaft 7, a hole is formed for projecting the writing tip portion 11 of the refill 5. 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 is defined as the "rear" side. Further, in the axial direction of the cap 4, the opening end side into which the writing tool main body is inserted is defined as the "rear" side, and the opposite side is defined as the "front" side.

The refill 5 has a cylindrical refill main body 9, a joint member 10, a writing tip portion 11, and a refill stopper 12. The refill body 9 is formed of 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 or a metal material such as polypropylene, polybutylene terephthalate, or polyacetal. Further, the rear end portion of the writing tip portion 11 is mounted in the front end portion of the joint member 10. The refill 5 is housed in the shaft tube 6, and a part of the writing tip portion 11 is exposed through the hole of the front shaft 7 described above in a state of being housed in the shaft cylinder 6. The writing tip portion 11 serving as the writing portion holds the ball at the tip, and the ink contained in the refill main body 9 portion is ejected through the joint member 10 in accordance with the rotation of the ball during writing. A refill plug 12 is press-fitted into the rear end portion of the refill body 9, and is attached by fitting by this press-fitting.

The cap 4 has a cap main body 4a, a clip portion 4b, a seal member 13, and an erasing member 2. The cap body 4a is a cylindrical member, and a clip portion 4b is integrally provided on a 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, examples of the material for forming the cap body 4a and the clip portion 4b include synthetic resins such as polycarbonate and acrylonitrile-butadiene-styrene. As described above, it is desirable that the material is made of a material harder than the toe shaft 7.

Further, the seal member 13 protects the writing tip 11 by engaging the writing tip 11 when the cap 4 is attached to the front shaft 7 and elastically deforming the cap 4. Examples of the material forming the seal member 13 include synthetic rubbers such as isopropylene rubber, butadiene rubber, nitrile rubber, silicone rubber, butyl rubber, ethylenepropylene diene rubber, styrene butadiene rubber, and fluororubber. In particular, butyl rubber (IIR) can further improve workability and volatilization prevention performance at the tip of the writing portion. 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 sealing member with butyl rubber, it is possible to prevent the writing tip from drying and prevent the solvent component in the ink from volatilizing more reliably.

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 cross-sectional view of the cap 4 shown in FIG. 2, and FIG. 4 is a cap shown in FIG. It is another vertical sectional view of 4. 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 engaging portion 4c that engages with the front shaft 7 is provided on the inner wall near the opening end of the cap body 4a. Inside the front end 4d of the cap body 4a, that is, near the top, three or more ribs 4e extending in the axial direction of the writing tool 1 are provided at equal intervals in the circumferential direction. In this embodiment, 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 each have the same axial length, but only the 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. You may. These long ribs 4f serve as guides when the seal member 13 is inserted when the cap 4 is assembled, facilitating 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 immediately below the clip portion 4b extending in the longitudinal direction. As a result, the clip portion 4b and the long ribs 4f facing each other are arranged on substantially the same plane passing through the central axis of the cap 4, and cause an aesthetic impression.

The front end 4d of the cap body 4a has a fitting portion 14 arranged on the central axis, two connecting portions 15 connecting the end portion 4d and the fitting portion 14, and the fitting portion 14 and the connecting portion. A support wall 16 arranged around the 15 is provided. Further, the front end 4d of the cap body 4a is provided with a circular ventilation opening 4g around the central axis, but the ventilation opening 4g may not be provided.

The fitting portion 14 has a truncated cone shape in which the rear end portion has a larger diameter and the diameter becomes smaller toward the front end portion. The front end face edge portion 14a portion of the fitting portion 14 is chamfered in a round shape. Further, the rear end face edge portion 14b has a 90-degree or acute-angled corner portion 14c. The shape of the fitting portion 14 is not limited to the shape of a truncated cone, and may be a sphere, a cylinder, a polygonal pyramid, or the like.

The connecting portion 15 is two columnar members extending from the inner wall of the ventilation opening 4g toward the front of the cap 4, and is 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. Further, the fitting portion 14 is supported by the connecting portion 15 on the rear end surface in the vicinity of the edge thereof. As is clear from FIG. 3, the connecting portion 15 does not extend along the central axis, but extends slightly inclined toward the central axis toward the front. 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 embodiment, 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 embodiment, the number of connecting portions 15 is two, but one or three or more may be used. When there is only one connecting portion 15, it is connected near the center of the facing surface of the fitting portion 14. Further, when the ventilation 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 embodiment, the cap body 4a and the support wall 16 are integrally formed, but may be formed separately. The support wall 16 has an inner peripheral surface 16a into which the insertion portion 2a of the erasing member 2 is fitted, as will be described later.

Subsequently, the structure of the erasing member 2 will be described with reference to FIGS. 5 to 7. 5 is a perspective view of the erasing member 2 of the writing tool 1 shown in FIG. 1, FIG. 6 is another perspective view of the erasing member 2 of the writing tool 1 shown in FIG. 1, and FIG. 7 is a perspective view of the erasing member 2. It is a vertical cross-sectional view of the erasing member 2 shown in FIG.

The erasing member 2 is used to rub the paper surface and the like by exposing the erasing member 2 to the outside while the erasing member 2 is attached to the cap and the insertion portion 2a which is inserted and surrounded by the support wall 16 of the cap body 4a. It has an erasing portion 2b to be formed, and a fitting hole 2c extending in the axial direction and penetrating the insertion 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, ethylene propylene diene rubber, or a rubber elastic material such as a thermoplastic elastomer such as a styrene elastomer, an olefin elastomer, or a polyester elastomer, 2 Examples thereof include a mixture of more than one kind of elastic material, a mixture of a rubber elastic material and a synthetic resin, and a commercially available eraser.

The insertion portion 2a has a substantially cylindrical 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 engaging protrusion 2d on the side surface in the circumferential direction. The engaging protrusion 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. In addition, instead of the annular engaging protrusion 2d, a plurality of protrusions may be formed in the circumferential direction. Further, if the erasing member 2 can be prevented from rattling by other means, the engaging protrusion 2d may not be provided.

Further, a flat portion 2e may be provided on a part of the side surface of the insertion portion 2a along the axial direction. When the erasing member 2 is formed by injection molding, the flat portion 2e can be used as 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, so that the gate residue remains. It is possible to prevent contact with the inner peripheral surface. Further, as will be described later, by providing the protrusion corresponding to the inner peripheral surface 16a of the support wall 16, it is possible to position the support wall 16 in a predetermined direction at the time of mounting, and it is possible to prevent the erasing member 2 from rotating after mounting. can.

The erasing portion 2b has a truncated cone shape in which the rear end portion has a larger diameter and the diameter becomes smaller toward the front end portion. The front end face edge portion of the erasing portion 2b is chamfered in a round shape. The rear end portion of the erasing portion 2b has a larger diameter than the inserting portion 2a, and therefore forms a stepped jaw portion 2f with the inserting portion 2a. When the erasing member 2 is attached to the cap, the rear end surface of the jaw portion 2f comes into contact with 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 tapered portion 2g, a small diameter portion 2h, and a large diameter portion 2i in order from the rear end portion into which the fitting portion 14 is inserted, that is, the inlet portion. The tapered portion 2g has a tapered shape that narrows from the rear end portion of the fitting hole 2c toward the front, that is, 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 stepped shape, and as will be described later, a locking portion 2j that prevents the fitting portion 14 from coming off is formed. The small diameter portion 2h may be omitted.

Since the fitting hole 2c penetrates in this embodiment, even if the erasing member 2 comes off from the cap after the product is shipped and an infant or the like accidentally swallows it, safety can be ensured without obstructing 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 tool 1 shown in FIG. 1 is attached, FIG. 9 is a side view of the cap 4 shown in FIG. 8, and FIG. 10 is a side view of the cap 4. 8 is a vertical cross-sectional view of the cap 4 shown in FIG. 8 in line XX of FIG. 9, FIG. 11 is another vertical cross-sectional view of the cap 4 shown in FIG. 8, and FIG. 12 is FIG. 9 is a cross-sectional view taken along the line YY of FIG. 9 and FIG. 13 is a cross-sectional view taken along the line ZZ of FIG. 9 of the cap 4 shown in FIG. Is an enlarged cross-sectional view showing an attachment portion between the erasing member 2 and the cap 4 of the writing tool 1 shown in FIG. FIG. 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 into the space 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 insertion portion 2a of the erasing member 2 is the support wall 16. Guided along the inner surface of the. The fitting portion 14 passes through the tapered portion 2g and the small diameter portion 2h of the fitting hole 2c and exceeds the locking portion 2j, and the rear end surface of the jaw portion 2f of the erasing member 2 is the front end surface 16b of the support wall 16. When they come into contact with each other, the attachment 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.

Since the front end face edge portion 14a of the fitting portion 14 is roundly chamfered and the inlet portion at the time of insertion into the fitting hole 2c is a tapered tapered portion 2g, the fitting hole 2c of the fitting portion 14 Insertion into the inside is done smoothly. Further, during the insertion of the fitting portion 14 into the fitting hole 2c, only the outer peripheral surface 14d of the fitting portion 14 moves while being in contact with the inner peripheral surface 2k of the fitting hole 2c in the fitting hole 2c. There is. That is, the pressure input required for insertion is largely due to 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 these contact areas are substantially constant. , The pressure input required during insertion is also fairly 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 connecting portions 15 in a state where the attachment is completed. That is, as described above, the two connecting portions 15 are inclined and extended toward the central axis toward the front, and this inclination is equal to or larger than the inclination of the tapered portion 2g of the fitting hole 2c. Set. Therefore, during the attachment of the erasing member 2, the connecting portion 15 does not come into contact with the inner peripheral surface 2k of the fitting hole 2c. 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 above-mentioned insertion such that the contact area is substantially constant. It is realized by the existence of the gap space 17 around the connecting portion 15 formed from the above. The gap 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 gap space 17 reduces the frictional resistance during attachment of the erasing member 2 to the cap, and enables easy attachment.

In the state where the attachment is completed, the fitting portion 14 is slightly separated from the stepped 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 slightly separated from the front end portion 4d of the cap body 4a in the axial direction. The engaging protrusion 2d provided on the side surface of the insertion portion 2a of the erasing member 2 is elastically deformed 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 make the engagement between the engaging protrusion 2d and the inner peripheral surface 16a of the support wall 16 more reliable, the inner circumference of the support wall 16 at the position corresponding to the engaging protrusion 2d after the installation is completed. The surface may be provided with a recess 16c having a shape corresponding to the engaging protrusion.

In the state where 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 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. Fit and block it. Therefore, in order to pull out the erasing member 2 from the cap 4, it is necessary to apply a stronger force. As a result, the locking portion 2j or the corner portion 14c is elastically deformed to release the engagement, and the erasing member 2 can be pulled out from the cap 4.

It is preferable that the pulling force required to pull out the erasing member 2 from the cap 4 is designed to be larger than the pressure input required to attach the erasing member 2 to the cap 4. This can be achieved, for example, by adjusting the inclination or the minimum inner diameter of the tapered portion 2g of the fitting hole 2c, the maximum outer diameter of the fitting portion 14, and the like.

The fitting hole 2c of the erasing member 2 may be configured so that it has only the tapered portion 2g and does not have the small diameter portion 2h and the large diameter portion 2i, that is, it does not have the locking portion 2j. In this case, the fitting portion 14 is engaged by the 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 aspect of the present invention shown in FIG. 1 uses a thermochromic ink as the ink. The thermochromic ink maintains a predetermined color (first color) at room temperature (for example, 25 ° C.), and changes to another color (second color) when the temperature is raised 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). In the writing instrument 1 using the thermochromic ink, the second color is made colorless, and the drawing line written with the first color (for example, red) is heated to be colorless, which is referred to as "erasing" here. .. Therefore, in this embodiment, the drawing line is rubbed against the written paper surface or the like by the erasing member 2 to generate frictional heat, whereby the drawing line is changed to colorless, that is, erased. As a matter of course, the second color may be a color other than colorless.

The term "erasing" in the present invention means that the drawn lines, characters, etc. written are adsorbed or scraped off by an erasing member 2 such as an eraser, in addition to the case where the heat-discoloring ink is used. Therefore, the above-described aspect and the following aspects of the present invention can be applied to any writing instrument that erases the drawn lines by using the erasing member 2.

Hereinafter, a writing tool according to another aspect of the present invention will be described. Since the writing tool main body is the same as the above-described embodiment, the description thereof will be omitted, and the points different from the above-described aspects will be described.

FIG. 15 is a perspective view of the cap 24 in a mode different from that of the cap 4 of the writing tool 1 shown in FIG. 1, and FIG. 16 is a vertical 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 in the insertion portion 2a of the erasing member 2 when the erasing member 2 is attached to the cap 24. When the cap 24 has the positioning protrusion 24h, the erasing member 2 can be positioned in a predetermined direction at the time of attachment, and the erasing member 2 can be prevented from rotating after the attachment. When the cap 24 is made of a transparent or translucent 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 so as to be aligned with the clip portion 4b. It is preferable because it causes a beautiful feeling in relation to the relationship.

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

In this embodiment, the cap 24 is as 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 simplified in the drawing, it has at least a tapered 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. As described above, the fitting hole 22c may have only the tapered portion.

A concave curved surface 22m is provided on the front end surface of the erasing portion 22b. By providing the concave portion 22m on the front end surface of the erasing portion 22b, it is possible to erase a minute portion using the edge portion of the concave portion 22m. Further, by holding the erasing member 22 perpendicular to the paper surface on which the drawn lines are drawn and erasing it, the frictional resistance is reduced and smooth as compared with the case where the front end surface of the erasing portion is formed in a convex curved surface shape. Moreover, a wide range of erasure is possible.

FIG. 20 is a perspective view of a cap 24 to which an erasing member 32 of a mode different from that of the erasing member 2 of the writing instrument shown in FIG. 1 is attached, and FIG. 21 is a perspective view of the 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 as shown in FIGS. 15 and 16. The erasing member 32 has the same insertion portion 2a and fitting hole 2c as compared with the erasing member 2 shown in FIGS. 5 to 7, and differs only in the outer shape of the erasing portion 32b. The eraser 32b has an outer shape that is circular in cross-sectional shape on the rear end surface, but gradually changes to an elliptical shape in which the ratio of the major axis to the minor axis gradually increases from the rear end surface to the front end surface. Have. The length of the elliptical long axis on the front end face of the eraser 32b is shorter than the circular diameter of the rear end face of the eraser 32b. By making the cross-sectional shape of the erasing portion 32b an elliptical shape, when erasing a drawn line or the like, 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. Depending on whether it is in the middle, it is possible to realize different erasing widths, that is, areas that can be scraped at one time.

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

In this embodiment, the cap 24 is as shown in FIGS. 15 and 16. The erasing member 42 has the same insertion portion 2a and fitting hole 2c as compared with the erasing member 2 shown in FIGS. 5 to 7, and differs only in the outer shape of the erasing portion 42b. The eraser 42b has a circular cross-sectional 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 chamfered round at the corner, 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 using the side portion 42n and the corner portion 42o. The shape of the front end surface of the erasing portion 42b is not limited to a hexagon, and may be another polygon such as a triangle or a quadrangle.

FIG. 26 is a perspective view of a cap 24 to which an erasing member 52 of a mode different from that of the erasing member 2 of the writing instrument shown in FIG. 1 is attached, and FIG. 27 is a perspective view of the 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 as shown in FIGS. 15 and 16. The erasing member 52 is the same in the insertion portion 2a and the fitting hole 2c as compared with the erasing member 2 shown in FIGS. 5 to 7, and differs only in the outer shape of the erasing portion 52b. In the erasing unit 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 pyramid shape. A flat portion 2e positioned by the positioning projection 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 body 24. There is.

By arranging the first half body 52p on the clip portion 4b side of the cap, the hexagonal frustum-shaped surface of the second half body 52q becomes easy to use. 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 of the clip portion 4b so as to avoid the clip portion 4b. A 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 frustum-shaped surface of the second semifield 52q faces the paper surface.

The first half body 52p has the same shape as the erasing portion 2b shown in FIGS. 5 to 7. Since the second semifield 52q is a hexagonal frustum-shaped semifield, it has three plane portions 52r. Therefore, erasing in a narrow surface is possible by erasing with the first semifield 52p portion of the erasing unit 52b. On the other hand, when erasing with the second half body 52q portion of the erasing unit 52b, by using each plane 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 flat surface portion or the connecting portion 52t between the mountain portion and the front end surface, it is possible to erase a smaller portion.

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

In this embodiment, the cap 24 is as shown in FIGS. 15 and 16. The erasing member 62 is the same in the insertion portion 2a and the fitting hole 2c as compared with the erasing member 2 shown in FIGS. 5 to 7, and differs only in the outer shape of the erasing portion 62b. The erasing unit 62b has a configuration in which both surfaces of the second half body 52q portion shown in FIGS. 26 to 28 are replaced with a truncated cone shape of the first half body 52p. Therefore, the erasing portion 62b includes a truncated cone-shaped portion 62u and a hexagonal cone-shaped portion 62v. A flat portion 2e positioned by the positioning projection 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 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 of the clip portion 4b so as to avoid the clip portion 4b. A 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 surface of the hexagonal frustum-shaped portion 62v faces the paper surface.

By erasing with the truncated cone-shaped portion 62u of the erasing portion 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 between the mountain portion 62w and the front end surface, it is possible to erase a smaller portion.

In the above aspect of the erasing member of the present invention, the erasing member is attached to the front end of the cap, but the same can be applied to the rear end of the writing instrument main body.

FIG. 32 is a vertical cross-sectional view of the writing tool 100 according to the second embodiment provided with the erasing member 2 according to one aspect of the present invention. The writing tool 100 is a ballpoint pen type writing tool, and has a writing tool main body 3 having a refill 5 and a cylinder 6 extending in a cylindrical shape, and a cap 104. The axle cylinder 6 has a cylindrical front shaft 7 and a rear shaft 8 whose front end is screwed onto the rear end of the front shaft 7. The writing tool 100 according to the present embodiment is different from the writing tool 1 according to the first embodiment described above only in the outer shape of the cap, particularly the shape of the clip portion. Therefore, in the following description, the clip portion will be particularly described, and the description of other parts will be omitted. The cap 104 can be configured so that the erasing member attached to the cap 4 shown in FIG. 4 can be attached, for example, and the 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 tool 100 shown in FIG. 32, FIG. 34 is a plan view of the cap 104 shown in FIG. 33, and FIG. 35 is a plan view of the cap 104 shown in FIG. 33. It is a side view of 104, FIG. 36 is a vertical sectional view of the cap 104 shown in FIG. 33, and FIG. 37 is a sectional view of the cap 104 shown in FIG. 33 in line SS of FIG. be.

The cap 104 has a cap main body 104a, a clip portion 104b, and an erasing member 2 in this embodiment. The cap body 104a is a cylindrical member, and a clip portion 104b is integrally provided on a side surface thereof 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, examples of the material for forming the cap body 104a and the clip portion 104b include synthetic resins such as polycarbonate and acrylonitrile-butadiene-styrene. As described above, it is desirable that the material is made of a material harder than the toe shaft 7.

The feature of the cap 104 is that the clip portion 104b is a substantially rectangular plate-shaped member extending in the axial direction over the substantially overall length of the clip main body 104a. As shown in FIG. 34, the rear end surface of the clip portion 104b is formed in a curved surface shape so as to improve the feel. Further, 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 thereof are formed in a curved surface 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, the slope may be aligned with the facing paper surface at the time of erasing.

As is clear from the plan view of FIG. 34, the width W of the clip portion 104b is substantially the same as the diameter of the tubular cap body 104a. 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 decorating the surface with transfer printing or the like, the design can be enhanced and the appeal to the user can be enhanced. Further, by adhering a rubber elastic material such as rubber or elastomer to the surface, an erasing surface wider than that of the erasing member 2 is formed, so that the area to be erased can be used properly.

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

FIG. 38 is a diagram showing a usage state at the time of erasing the cap 104 to which the erasing member 2 of the writing tool 100 shown in FIG. 32 is attached. As shown in FIG. 38, at the time of erasing, by sliding the cap 104 along the guide surface 104d while pressing the flat guide surface 104d of the clip portion 104b against the paper surface, 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 can be performed, and erasing in a long range with a constant width can be easily performed. It becomes possible to do. Further, by sliding the cap 104 while pressing the guide surface 104d of the clip portion 104b against the paper surface and bringing the wide surface of 104b into contact with 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, etc., the angle A formed by the paper surface and the central axis of the writing tool 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 above-mentioned effects, the width W of the clip portion 104b and the diameter of the cap body 104a are substantially the same. Therefore, for example, when the writing tool 100 is placed on a desk or the like with the wide flat surface of the clip portion 104b facing up, the writing tool The 100 rotates and the side surface of the clip portion 104b comes into contact with the desk or the like, so that the writing tool 100 can be maintained in a state of being directly beside it. Therefore, there is an effect that the barrel 6 can be easily gripped when the writing tool 100 is picked up. In addition, the writing tool 100 can always be prevented from rolling.

Further, the clip portion 104b is extended to the position of the center of gravity of the writing tool, and the cap 104 has the clip portion 104b having the above-mentioned structure, so that, for example, the writing tool 100 is placed on a desk or the like with the wide flat surface of the clip portion 104b facing down. In this case, the rear end of the writing tool 100 does not touch the desk and can be stabilized in a floating state. Therefore, there is an effect that the barrel 6 can be easily gripped when the writing tool 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 front shaft and the rear shaft.

1 Stationery 2 Erasing member 2c Fitting hole 3 Writing tool body 4 Cap 14 Fitting part 15 Connection part 16 Support wall 17 Gap space

Claims (1)

A writing tool with an erasing member attached to the rear end of the writing tool body or the front end of the cap.
The erasing member has an erasing portion, and a concave curved surface-shaped recess is provided on the front end surface of the erasing portion.
A clip portion is integrally provided on the side surface of the writing tool main body or the cap via a connecting portion.
The clip portion is a substantially rectangular plate-shaped member extending in the axial direction.
The width of the clip portion and the diameter of the cap are substantially the same, and the clip portion extends to the position of the center of gravity of the writing tool.
An erasing member characterized in that a flat 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. Writing utensils equipped with.

Images