Notepads

Abstract

Provided is a writing implement in which the pen tip is supported in a tiltable manner so that the entire pen tip makes contact with a paper surface, and which makes it possible to relatively easily draw a straight line as intended.　The front portion of the pen tip extends in a linear direction that is tilted at an acute angle with respect to the axis direction in a side view, and the cross section of the front portion of the pen tip with respect to the extending direction has a substantially rectangular shape. A holding member has a holding portion that surrounds at least a part of the front portion of the pen tip. The holding portion has openings that are provided on both longer dimension sides of the substantially rectangular cross section of the front portion of the pen tip. The vertex portion of the pen tip is formed to be substantially straight in a side view, and is substantially perpendicular to the extending direction of the front portion of the pen tip. The back end edge of each of the openings is formed to be substantially straight in a side view, and is substantially parallel to the vertex portion of the pen tip. The holding portion has an extending piece that extends in a direction substantially parallel to the extending direction of the front portion of the pen tip and that is provided on a shorter dimension side of the substantially rectangular cross section of the front portion of the pen tip, said shorter dimension side being on the inner side in a side view.

Description

[Technical Field]

[0001] The present invention relates to a writing instrument, and more particularly to a writing instrument (such as a marking pen) that includes a pen tip and a holding member that holds the pen tip. [Background technology]

[0002] For example, Patent Document 1 discloses a writing implement that is supported so that it can tilt freely so that the entire writing part comes into contact with the writing surface due to the force applied to the barrel as writing occurs. Because the pen body tilts so that the entire writing part comes into contact with the writing surface, it is easy to draw lines of a consistent width.

[0003] In Patent Document 2, the applicant of the present application discloses a writing implement in which the entire writing part is in contact with the paper surface reliably, thereby reliably obtaining a consistent line width.

[0004] 11 is a side view of a writing implement 101 according to Patent Document 2, FIG. 12 is an enlarged view of a main part of FIG. 11, FIG. 13 is an enlarged perspective view of a main part of FIG. 12, and FIG. 14 is a vertical cross-sectional view of FIG.

[0005] As shown in Figures 11 to 14, the writing implement 101 according to Patent Document 2 includes a pen tip 102 and a holding member 103 that holds the pen tip 102. The front portion 123 of the pen tip 102 extends in the axial direction, The cross section of the front part 123 of the pen tip 102 in the extension direction has a substantially rectangular shape, The tip of the holding member 103 has a holding portion 131 that surrounds the front portion 123 of the pen tip 102, The holding portion 131 has notched openings 133 on both long sides of the substantially rectangular cross section of the front portion 123 of the pen tip 102, The tip 122 of the pen tip 102 is formed in a substantially straight line in a side view and forms an acute angle with respect to the extending direction of the front part 123 of the pen tip 102. The rear edge 134 of the opening 133 is formed in a substantially straight line in a side view and is parallel to the top 122 of the pen tip 102. The holding portion 131 has a pair of extension pieces 135 extending in a direction approximately parallel to the extension direction of the front portion 123 of the pen tip 102 on both short sides of the approximately rectangular cross section of the front portion 123 of the pen tip 102.

[0006] The notched opening 133 allows the pen tip 102 to bend and deform along the long side when writing. This allows the entire writing part to contact the paper surface, ensuring a consistent line width. Furthermore, the contact of the pair of extension pieces 135 with the paper surface encourages writing with the designed writing pressure and prevents excessive bending (and therefore damage) of the pen tip 102. [Prior art documents] [Patent documents]

[0007] [Patent Document 1] Japanese Patent Application Laid-Open No. 2005-297540 [Patent Document 2] Japanese Patent Application Publication No. 2019-155879 Summary of the Invention [Problem to be solved by the invention]

[0008] The writing implement according to Patent Document 2 has the advantages described above, but the inventors of the present invention have found the following improvements.

[0009] 15, when drawing a straight line using a ruler, the inner extension piece 135 contacts the ruler at an angle, making the pen tip 102 unstable. For this reason, it may not be easy to draw a straight line as intended.

[0010] 16, when drawing a straight line without using a ruler, the top 122 of the pen tip 102 forms an acute angle with the extension direction of the front part 123 of the pen tip 102 (and the pair of extension pieces 135), so the direction A in which the pen tip 102 is bent (sunk into the paper surface) and the direction B in which the pen tip 102 is moved form an acute angle (intersect in a plan view). This can make it difficult to draw a straight line as intended.

[0011] The present invention was made in light of the above findings. An object of the present invention is to provide a writing instrument that is tiltably supported so that the entire pen tip contacts the paper surface, and that makes it relatively easy to draw a straight line as intended, both when using a ruler and when not using a ruler. [Means for solving the problem]

[0012] The present invention provides The pen tip and a holding member for holding the pen tip; A writing instrument comprising: The front part of the pen tip extends in a linear direction inclined at an acute angle with respect to the axial direction in a side view, A cross section of the front part of the pen tip relative to the extension direction has a substantially rectangular shape, the holding member has a holding portion that surrounds at least a portion of the front portion of the pen tip, The holding portion has openings on both long sides of the substantially rectangular cross section of the front portion of the pen tip, The tip of the pen tip is formed in a substantially straight line in a side view and is substantially perpendicular to the extension direction of the front part of the pen tip, a rear edge of the opening is formed in a substantially straight line in a side view and is substantially parallel to the top of the pen tip; The holding portion has an extension piece that extends in a direction substantially parallel to the extension direction of the front portion of the pen tip on a short side of the substantially rectangular cross section of the front portion of the pen tip, the short side being an inner short side in a side view. A writing instrument characterized by is.

[0013] According to the present invention, the extension piece extends in a direction substantially parallel to the extension direction of the front part of the pen tip. Therefore, when drawing a straight line using a ruler, the extension piece can make line or surface contact with the ruler, and the pen tip is stable (see Figure 7). This makes it easy to draw a straight line as intended. Furthermore, even when drawing a straight line without using a ruler, the direction in which the pen tip is bent (sunk into the paper surface) and the direction in which the pen tip is moved match in a plan view (see Figure 8). This makes it easy to draw a straight line as intended.

[0014] Preferably, the holding portion has a pair of extension pieces extending in a direction approximately parallel to the extension direction of the front portion of the pen tip on both short sides of the approximately rectangular cross section of the front portion of the pen tip.

[0015] In this case, contact of the pair of extension pieces with the paper surface can more effectively encourage writing with the designed writing pressure, and can more effectively prevent excessive bending (and therefore damage) of the pen tip.

[0016] Preferably, a connecting portion of the pen tip that is continuous with the front portion on the rear side of the front portion extends generally in the axial direction.

[0017] This makes it possible to change the design of only the front part of the pen tip and the holding part of the holding member surrounding it from that of a conventional writing instrument.

[0018] In this case, it is more preferable that the connecting portion of the pen tip is provided with a narrowed portion whose cross section changes relative to the axial direction.

[0019] This can facilitate the operation of inserting the pen tip into the holding member (see FIG. 5).

[0020] Preferably, the width of the opening is greater than the width of the long side of the substantially rectangular cross section of the front part of the pen tip.

[0021] This means that the front part of the pen tip is not pressed against the inner surface of the extension piece when writing, allowing it to bend and deform more reliably toward the long side, and the entire pen tip comes into contact with the paper surface regardless of the angle of the pen tip relative to the paper surface, ensuring a consistent line width.

[0022] Preferably, the pen further comprises a barrel connected to the holding member, the rear portion of the holding member being attached to the front portion of the barrel, a first abutment wall portion being formed on the inner surface of the holding member, and a second abutment wall portion being formed on the inner surface of the barrel, and the outer surface of the nib being clamped in the front-to-back direction by the first abutment wall portion and the second abutment wall portion.

[0023] This effectively prevents the pen tip from falling off the holding member or from sinking into the holding member, and furthermore, the amount of protrusion of the pen tip from the holding member can be accurately maintained.

[0024] Preferably, the nib is any one of a fiber nib, a felt nib, a nib made of a porous material having open cells, and a plastic nib having an axial capillary passage.

[0025] This allows the pen tip to have the desired flexibility, which allows it to bend and deform more reliably along the long side, ensuring that the entire pen tip comes into contact with the paper surface regardless of the angle of the pen tip relative to the paper surface, and ensuring a consistent line width. Preferably, the tip of the front part of the pen tip is provided with a chamfered portion on the side that is inclined at an acute angle in a side view. This effectively prevents breakage and peeling at the tip on the acutely inclined side (inner side) of the front part of the nib. In particular, when the nib is a fiber nib, the fibers are arranged in the axial direction during the manufacturing process. Therefore, if the tip on the inner side of the front part of the nib is at a right angle, that part becomes a collection of short fibers and is very fragile. By providing a chamfered portion in that part, the fibers constituting that part become longer, thereby significantly reducing fragility and effectively preventing breakage and peeling. Even in cases where the nib is made of a porous material with open cells, if the tip on the inner side of the front part of the nib is at a right angle, that part will be very fragile. Even in this case, by providing a chamfered portion in that part, the fragility of that part will be significantly reduced and breakage and peeling will be effectively prevented. [Effects of the Invention]

[0026] According to the present invention, the extension piece extends in a direction substantially parallel to the extension direction of the front part of the pen tip. Therefore, when drawing a straight line using a ruler, the extension piece can make line or surface contact with the ruler, and the pen tip is stable (see Figure 7). This makes it easy to draw a straight line as intended. Furthermore, even when drawing a straight line without using a ruler, the direction in which the pen tip is bent (sunk into the paper surface) and the direction in which the pen tip is moved match in a plan view (see Figure 8). This makes it easy to draw a straight line as intended. [Brief explanation of the drawings]

[0027] [Figure 1] 1 is a vertical cross-sectional view showing a writing implement according to an embodiment of the present invention. [Figure 2] FIG. 2 is an enlarged view of a main part of FIG. [Figure 3] FIG. 3(a) is a side view of the pen tip of FIG. 1, and FIG. 3(b) is a perspective view. [Figure 4] 4(a) is a side view of the holding member of FIG. 1, and FIG. 4(b) is a perspective view. [Figure 5]5 is a schematic side view of the pen tip of FIG. 3 being inserted into the holding member of FIG. 4. FIG. [Figure 6] 6(a) is a side view of the pen tip of FIG. 3 inserted into the holding member of FIG. 4, and FIG. 6(b) is a perspective view. [Figure 7] 7A to 7C are explanatory diagrams illustrating the case where a straight line is drawn using a ruler with the writing implement of this embodiment, where FIG. 7A is a schematic perspective view, FIG. 7B is a schematic front view, and FIG. 7C is a schematic plan view. [Figure 8] 8A and 8B are explanatory diagrams illustrating a case where a straight line is drawn using the writing implement according to the present embodiment without using a ruler, with FIG. 8A being a schematic perspective view and FIG. 8B being a schematic plan view. [Figure 9] FIG. 9(a) is a side view of a modified pen tip, and FIG. 9(b) is a perspective view. [Figure 10] FIG. 10 is a side view of a modified example of the holding member. [Figure 11] FIG. 1 is a side view of a writing implement according to Patent Document 2. [Figure 12] FIG. 12 is an enlarged view of a main part of FIG. [Figure 13] FIG. 13 is an enlarged perspective view of a main part of FIG. 12. [Figure 14] FIG. 13 is a longitudinal cross-sectional view of FIG. [Figure 15] 15(a) is a schematic perspective view, FIG. 15(b) is a schematic front view, and FIG. 15(c) is a schematic plan view, which are explanatory diagrams of drawing a straight line using a ruler with a writing implement according to Patent Document 2. [Figure 16] 16A and 16B are explanatory diagrams showing how to draw a straight line using a writing implement according to Patent Document 2 without using a ruler, with FIG. 16A being a schematic perspective view and FIG. 16B being a schematic plan view. [Figure 17] FIG. 17(a) is a side view of the pen tip of the writing implement according to the second embodiment of the present invention, and FIG. 17(b) is a perspective view. [Figure 18] FIG. 18(a) is a side view of a holding member of a writing implement according to a third embodiment of the present invention, and FIG. 18(b) is a perspective view. [Figure 19]19A and 19B are explanatory views of a case where a straight line is drawn using a ruler with a writing implement according to a third embodiment of the present invention, with FIG. 19A being a schematic perspective view and FIG. 19B being a schematic front view. [Figure 20] FIG. 20(a) is a side view of a holding member of a writing implement according to a fourth embodiment of the present invention, and FIG. 20(b) is a perspective view. [Figure 21] 21A and 21B are explanatory views of a case where a straight line is drawn using a ruler with a writing implement according to a fourth embodiment of the present invention, with FIG. 21A being a schematic perspective view and FIG. 21B being a schematic front view. [Figure 22] FIG. 22(a) is a side view of the pen tip of a writing implement according to a fifth embodiment of the present invention, and FIG. 22(b) is a perspective view. DETAILED DESCRIPTION OF THE INVENTION

[0028] Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

[0029] Fig. 1 is a vertical cross-sectional view showing a writing instrument 1 according to this embodiment, Fig. 2 is an enlarged view of a main part of Fig. 1, Fig. 3(a) is a side view of the pen tip 2 of Fig. 1, Fig. 3(b) is a perspective view of the pen tip 2 of Fig. 1, Fig. 4(a) is a side view of the holding member 3 of Fig. 1, and Fig. 4(b) is a perspective view of the holding member of Fig. 1. Also, Fig. 5 is a schematic side view of the pen tip 2 of Fig. 3 in the middle of being inserted into the holding member 3 of Fig. 4, Fig. 6(a) is a side view of the pen tip 2 of Fig. 3 inserted into the holding member 3 of Fig. 4, and Fig. 6(b) is a perspective view thereof.

[0030] (Overall composition) 1 to 6, the writing instrument 1 according to this embodiment includes a pen tip 2 and a holding member 3 that holds the pen tip 2. The writing instrument 1 according to this embodiment also includes an ink reservoir 6, and a front barrel 4 and a rear barrel 5 that house the ink reservoir 6 therein. The holding member 3 is press-fit into the front barrel 4.

[0031] (Pen tip 2) The nib 2 is made of a fiber nib (a resin-processed fiber bundle). However, the nib 2 may be any flexible material that allows ink to flow through it, and specific examples include a porous synthetic resin material with open cells, a felt nib, a brush nib, and a plastic nib with an axial capillary passage.

[0032] The front part 23 of the pen tip 2 extends in a linear direction inclined at an acute angle (30° in this embodiment) relative to the axial direction in a side view. The cross section of the front part 23 of the pen tip 2 in the extension direction has a substantially rectangular shape (long side 4.5 mm, short side 1 to 3 mm). The extension length (the length maintaining the substantially rectangular cross section) is 2.6 mm in this embodiment.

[0033] The front part 23 of the pen tip 2 is sandwiched (partially surrounded) by a pair of extension pieces 35 of the holding member 3, which will be described later, and the top part 22 of the pen tip 2 protrudes slightly forward (diagonally forward) from the tip of the holding member 3. The top part 22 of the pen tip 2 is formed in a substantially straight line in a side view, and is perpendicular to the extension direction of the front part 23 of the pen tip 2.

[0034] Here, it is preferable that the tip 22 of the pen tip 2 has a convex curved R-shape. In the writing instrument 1 of this embodiment, the pen tip 2 bends so that the entire pen tip 2 comes into contact with the paper surface regardless of the angle of the pen tip 2 relative to the paper surface, thereby reliably obtaining a consistent line width. Therefore, it is preferable that the tip 22 has an R-shape so that the tip 22 reliably comes into contact with the paper surface.

[0035] Furthermore, a notch 23d is provided in at least one of the front portion 23 of the pen tip 2 or the connecting portion 23b on the side where the front portion 23 of the pen tip 2 is inclined at an acute angle with respect to the axial direction in a side view. This makes it possible to easily form a pen tip shape in which the front portion 23 of the pen tip 23 extends in a linear direction inclined at an acute angle with respect to the axial direction in a side view by grinding, punching, or the like.

[0036] On the other hand, connecting portion 23b on the rear side of front portion 23 of nib 2, which is continuous with front portion 23, extends generally in the axial direction. However, connecting portion 23b is provided with narrowed portion 23c whose cross section changes with respect to the axial direction. The front end side of narrowed portion 23c is continuous with front portion 23 of nib 2 (the cross section with respect to the extension direction of front portion 23 of nib 2 is generally rectangular), and the rear end side of narrowed portion 23c is generally quadrangular prism-shaped (the cross section with respect to the axial direction is generally rectangular). In other words, connecting portion 23b on the rear side of front portion 23 has a generally rectangular cross section. Furthermore, narrowed portion 23c is at least a part of notch 23d, and narrowed portion 23c can also be easily processed by grinding, punching, or the like.

[0037] In addition, on the rear side of the connection portion 23b of the pen tip 2, there is a cylindrical (large diameter) central portion 24 whose outer surface is clamped in the front-to-rear direction by the holding member 3 and the front shaft 4, and a cylindrical (small diameter) rear end portion 25 which is connected to the front end portion of the ink absorbing body 6 in a piercing manner.

[0038] (Retaining member 3) The holding member 3 is a cylindrical body made by injection molding of synthetic resin, with both ends open. As shown in Figures 3 to 6, the pen tip 2 is fitted into the holding member 3 from the rear side (locked in the axial direction to prevent it from coming off).

[0039] The inner surface of the rear end of the holding member 3, which has a circular cross section, is formed with a plurality of (four in this case) equally spaced inner surface ribs extending in the axial direction, into which the central portion 24 of the nib 2 is press-fitted. Meanwhile, the outer surface of the rear end of the holding member 3, which has a circular cross section, is formed with a plurality of (six in this case) equally spaced outer surface ribs extending in the axial direction, into which the front barrel 4 is press-fitted. Because the rear end of the holding member 3 has a circular cross section, when the holding member 3 and the front barrel 4 are fitted, the outer surface of the holding member fitting portion of the front barrel 4 also has a circular cross section, ensuring a reliable airtight fit between the inner surface of the cap and the outer surface of the front barrel 4. The communication holes formed by the outer surface ribs and the front barrel 4 function as air vents, enabling smooth ink ejection from the nib 2.

[0040] 1 to 6, the holding member 3 has a holding portion 31 with a substantially rectangular cross section that generally surrounds the front portion 23 and connecting portion 23b of the nib 2. Because the connecting portion 23b of the nib 2 described above has a substantially rectangular cross section, and the holding portion 31 of the holding member 3 also has a substantially rectangular cross section, they serve as guides that allow alignment in the rotational direction (circumferential direction) when the nib 2 is inserted into the holding member 3 for assembly. This makes it easy to align the rotational orientations of the nib 2 and the holding member 3. Furthermore, notch-shaped openings 33 are provided on both long sides of the substantially rectangular cross section of the front portion 23 of the nib 2.

[0041] The width of the opening 33 is greater than the width of the long side of the approximately rectangular cross section of the front part 23 of the pen tip 2 .

[0042] When not writing, the pen tip 2 is positioned on the axis of the writing instrument 1. On the other hand, when writing, the pen tip 2 flexes and deforms toward the opening 33 (longer side) and can move out of the axis of the writing instrument 1. This allows the entire tip 22 of the pen tip 2 to contact the paper surface regardless of the angle between the axis of the writing instrument 1 and the paper surface, ensuring that a consistent line width can always be obtained.

[0043] Furthermore, the top 22 of the nib 2 is formed in a substantially straight line in a side view, extending in a direction perpendicular to the extension direction of the front part 23 of the nib 2, and the rear edge 34 of the opening 33 is also formed in a substantially straight line in a side view, extending in a direction parallel to the top 22 of the nib 2. As a result, the load on the nib 2 caused by bending of the nib 2 is applied evenly to the front part 23 of the nib 2, preventing localized stress concentration on the nib 2 and extending the life of the nib 2.

[0044] Furthermore, the shape of the pen tip 2 exposed from the holding member 3 in a side view is rectangular, so the orientation of the pen tip 2 can be determined from the orientation of the rear end edge 34. Therefore, once the pen tip 2 is exposed, it can be used for writing immediately.

[0045] At least at the time of filing this application, one aspect of the present invention is to provide opening 33 only in one side wall of holding portion 31. However, providing opening 33 in both side walls provides excellent convenience, as it is always possible to achieve the desired bending effect regardless of whether the user is right-handed or left-handed.

[0046] Furthermore, the holding portion 31 of this embodiment has a pair of extension pieces 35 (inner extension piece 35a and outer extension piece 35b) that protrude forward (perpendicular to the rear edge portion 34) from the rear edge portion 34 of the opening 33 on both short sides of the approximately rectangular cross section of the front portion 23 of the pen tip 2. The pair of extension pieces 35 extend in a direction parallel to the extension direction of the front portion 23 of the pen tip 2, and are adapted to come into contact with the paper surface when writing.

[0047] The pair of extension pieces 35 contact the paper surface, thereby preventing the pen tip 2 from bending too much and being broken or damaged, and also allowing the entire pen tip 2 to contact the paper surface.

[0048] Each of the pair of extension pieces 35 preferably tapers forward (in the direction perpendicular to the rear edge 34) and has a convex curved surface formed at its front end.

[0049] Furthermore, by having the pair of extension pieces 35 come into contact with the paper surface, when drawing a line on the paper using a ruler or the like, the inner extension piece 35 can make line or surface contact with the ruler or the like, and the pen tip 2 is stable (see Figure 7). This makes it easy to draw the line as intended. Also, because the pen tip 2 does not come into contact with the ruler or the like, it is possible to prevent the ruler or the like from being soiled by ink, and conversely, it is also possible to prevent dirt on the ruler or the like from transferring to the pen tip 2 and smudging the handwriting when writing.

[0050] Furthermore, even when drawing a line without using a ruler or the like, the direction A in which the pen tip 2 is bent (sunk into the paper surface) and the direction B in which the pen tip 2 is moved are the same in a plan view (see Figure 8). This makes it easy to draw a line as intended.

[0051] Furthermore, by providing the holding member 3 with the pair of extension pieces 35, when inserting the nib 2 into the cap or the like of the writing instrument 1, it is possible to prevent ink from adhering to the inner surface of the cap due to contact between the nib 2 and the inner surface of the cap. If ink adheres to the inner surface of the cap, the ink adhering to the inner surface of the cap may be transferred and adhered to the outer surface of the front barrel 4 when the cap is fitted to the writing instrument 1. This may result in the user's hands becoming soiled with ink when removing the cap again and gripping the front barrel 4 of the writing instrument 1.

[0052] Furthermore, since the holding member 3 has the inward extending piece 35a, the inward extending piece 35a and the step formed by the front part 23 of the pen tip and the notch 23d (narrowed part 23c) lock the holding member 3 in the axial direction, preventing it from coming off. This allows for a more stable fit between the pen tip 2 and the holding member 3.

[0053] Furthermore, the tip 22 of the pen tip 2 protrudes in the extension direction from the tip ends of the pair of extension pieces 35, and it is effective for the amount of protrusion to be more than 0.2 mm and less than 5.0 mm, and preferably more than 0.5 mm and less than 2.0 mm. The smaller the amount of protrusion within this preferred range, the more rigid and firm the writing feel will be, and the greater the amount of protrusion within this preferred range, the more soft the writing feel will be.

[0054] It is also preferable that the rear end edge 34 be chamfered or rounded. In particular, it is preferable that the edge on the pen tip 2 side, which is likely to come into contact with the pen tip 2, be chamfered or rounded. This makes it possible to minimize the load on the front part 23 of the pen tip 2, even if the pen tip 2 bends excessively and comes into contact with the rear end edge 34, and more effectively prevent the pen tip 2 from breaking or being damaged.

[0055] At least at the time of filing the present application, an embodiment in which the extension piece 35 is provided only on the inner short side in side view (that is, an embodiment in which only the inward extension piece 35a is provided) is also one embodiment of the present invention.

[0056] Furthermore, it is preferable that the color of the holding member 3 is different from the color (i.e., the ink color) of the pen tip 2. This makes the orientation of the rear end edge 34 more prominent, making it easier to confirm the orientation of the pen tip 2. In particular, if the pen tip 2 itself is colored a dark color such as black, and the holding member 3 is colored a light color different from the pen tip 2, the orientation of the rear end edge 34 will be even more prominent, making it easier to confirm the shape of the pen tip 2.

[0057] Furthermore, the entire holding member 3 may be made of a transparent or translucent material. In this case, the color of the ink can be easily seen. In addition, a form that is excellent in terms of design (aesthetics) can be provided.

[0058] Alternatively, only the area near the front end of the holding member 3 may be colored, with the remainder being made of a transparent or translucent material. This configuration has the effect of making it easier to grasp the relative positions of the writing implement and the writing object when the color of the writing object (e.g., paper) and the color of the ink are similar.

[0059] (front axis 4) The front shaft 4 is a cylindrical body with both ends open and made of synthetic resin by injection molding or extrusion molding. As shown in Figures 1 and 2, the outer surface (outer surface ribs) of the rear end of the holding member 3 is press-fitted onto the inner surface of the front end of the front shaft 4.

[0060] Additionally, a plurality of (eight in this example) vertical ribs 43 extending in the axial direction are formed integrally at equal intervals on the rear inner peripheral surface of the front barrel 4. The central portion 24 of the pen tip 2 is clamped in the front-to-rear direction between the first abutment wall portion 36 of the holding member 3 and the second abutment wall portion 41 at the front end of the vertical ribs 43.

[0061] This prevents the nib 2 from falling off the holding member 3 or from sinking into the holding member 3 (front barrel 4), and also accurately regulates the amount of protrusion of the nib 2 from the holding member 3. In addition, the front end of the ink occlusion body 6 is clamped in the front-to-rear direction between the third abutment wall portion 42 at the rear end of the vertical rib 43 and the bottom wall of the barrel 5, which will be described later.

[0062] (rear shaft 5) The rear axle 5, which is connected to the rear end of the front axle 4, is a cylindrical body with a bottom, an open front end, and a closed rear end, and is made by injection molding a synthetic resin (such as polypropylene). The front axle 4 is airtightly fitted into the rear axle 5 by screwing or press-fitting.

[0063] (ink occlusion body 6) The ink occlusion body 6 is made of a material having continuous pores that can be impregnated with ink. Examples include a heat-fused fiber bundle, a resin-processed fiber bundle, a resin-processed felt, a needle-punched felt, a porous body (for example, an open-cell synthetic resin body such as a sponge), etc. The ink occlusion body 6 may also have an outer skin made of a synthetic resin film or the like on its outer periphery.

[0064] (Action and effect) The writing instrument 1 configured as described above can achieve the following effects. That is, according to the writing instrument 1 of this embodiment, the extension piece 35 extends in a direction substantially parallel to the extension direction of the front part 23 of the pen tip 2. Therefore, when drawing a line using a ruler, the extension piece 35 can make line contact or surface contact with the ruler, and the pen tip 2 is stable (see FIG. 7). This makes it easy to draw a line as intended.

[0065] Furthermore, with the writing instrument 1 of this embodiment, even when drawing a line without using a ruler, the direction A in which the pen tip 2 is bent (sunk into the paper surface) and the direction B in which the pen tip 2 is moved coincide in a plan view (see FIG. 8). This makes it easy to draw a line as intended.

[0066] Furthermore, the holding portion 31 of the writing instrument 1 of this embodiment has a pair of extension pieces 35 that extend in a direction approximately parallel to the extension direction of the front portion 23 of the pen tip 2 on both short sides of the approximately rectangular cross section of the front portion 23 of the pen tip 2. Therefore, the contact of the pair of extension pieces 35 with the paper surface can more effectively encourage writing with the designed writing pressure, and can more effectively prevent excessive bending (and therefore damage) of the pen tip 2.

[0067] Furthermore, according to the writing instrument 1 of this embodiment, the connecting portion 23b, which is continuous with the front portion 23 of the pen tip 2 and is located on the rear side of the front portion 23, extends generally in the axial direction. This means that it is only necessary to change the design of the front portion 23 of the pen tip 2 and the holding portion 31 of the holding member 3 that surrounds it from that of the conventional writing instrument 101.

[0068] Furthermore, according to the writing instrument 1 of this embodiment, the connection portion 23b of the pen tip 2 is provided with a narrowed portion 23c whose cross section changes relative to the axial direction. This can facilitate the insertion of the pen tip 2 into the holding member 3 (see FIG. 5).

[0069] However, at least at the time of filing this application, an embodiment in which the narrowed portion 23c is not provided is also an embodiment of the present invention. That is, as shown in FIG. 9(a), the pen tip 2' may have a constant cross section in the axial direction throughout the entire connecting portion 23b'. The corresponding holding member 3' has a configuration as shown in FIG. 10. Furthermore, as shown in FIG. 9(b), the top portion 22 of the pen tip 2' may have a rectangular writing surface. This makes it easier to shape the top portion 22 of the pen tip 2'.

[0070] Furthermore, according to the writing instrument 1 of this embodiment, the width of the opening 33 is greater than the width of the long side of the approximately rectangular cross section of the front part 23 of the nib 2. This allows the nib 2 to bend and deform toward the long side more reliably when writing, and the entire nib 2 comes into contact with the paper surface regardless of the angle of the nib 2 relative to the paper surface, ensuring a consistent line width.

[0071] Furthermore, the writing instrument 1 of this embodiment further comprises a front shaft 4 connected to the holding member 3, the rear part of the holding member 3 is attached to the front part of the front shaft 4, a first abutment wall 36 is formed on the inner surface of the holding member 3, a second abutment wall 51 is formed on the inner surface of the front shaft 4, and the outer surface of the nib 2 is sandwiched in the front-to-rear direction between the first abutment wall 36 and the second abutment wall 41. This effectively prevents the nib 2 from falling off the holding member 3 or from sinking into the holding member 3, and furthermore, the amount of protrusion of the nib 2 from the holding member 3 can be accurately maintained.

[0072] The pen tip 2 is either a fiber pen tip (a resin-processed fiber bundle), a felt pen tip, a pen tip made of a porous material with open cells, or a plastic pen tip with an axial capillary passage. This allows the pen tip 2 to have the desired flexibility. This allows the pen tip 2 to bend and deform more reliably along the long side, ensuring that the entire pen tip 2 comes into contact with the paper surface regardless of the angle of the pen tip 2 relative to the paper surface, ensuring a consistent line width.

[0073] (Second embodiment) Figure 17(a) is a side view of a pen tip 202 of a writing implement according to a second embodiment of the present invention, and Figure 17(b) is a perspective view of the pen tip 202. As shown in Figures 17(a) and 17(b), the pen tip 202 of the second embodiment has a notch 223d so that the front portion 223 has a plate-like, approximately rectangular parallelepiped shape. The top portion 222 has a flat surface, and is not provided with a convex, curved, R-shaped portion.

[0074] The front portion 223 of the pen tip 202 extends in a linear direction inclined at an acute angle (30° in this embodiment) to the axial direction in a side view, similar to the front portion 23 of the pen tip 2 in the previous embodiment. The cross section of the front portion 223 of the pen tip 202 in the extension direction is approximately rectangular (long side 4.5 mm, short side (thickness) 1.5 mm). The extension length (the length maintaining the approximately rectangular cross section) is 2.5 mm in this embodiment.

[0075] The front part 223 of the pen tip 202 is sandwiched (partially surrounded) by a pair of extending pieces of a corresponding holding member (not shown), and the top part 222 of the pen tip 202 protrudes slightly forward (diagonally forward) from the tip of the holding member. The top part 222 of the pen tip 202 is formed in a substantially straight line in a side view, and is perpendicular to the extending direction of the front part 223 of the pen tip 202.

[0076] Here, the top 222 of the pen tip 202 does not have a convex curved R-shape but is a flat surface, so the contact area of ​​the top 222 with the paper surface during writing is smaller than that of the top 22 of the pen tip 2 of the above-mentioned embodiment. This reduces the degree of "ink puddle" that may form on the paper surface when the pen tip 202 is removed from the paper surface after writing.

[0077] In this embodiment, a notch 223d is provided on the side of the front portion 223 of the pen tip 202 that is inclined at an acute angle with respect to the axial direction in a side view so that the front portion 223 of the pen tip 202 has a substantially rectangular parallelepiped shape. Here, in the embodiment shown in Figures 17(a) and 17(b), the front end of the notch 223d is located slightly rearward of the apex 222, so the front portion 223 of the pen tip 202 does not have a perfect rectangular parallelepiped shape, but the position of the front end of the notch 223d may be aligned with the apex 222 to give the front portion 223 of the pen tip 202 a perfect rectangular parallelepiped shape.

[0078] On the other hand, connecting portion 223b, which is continuous with front portion 223 of pen tip 202 and is located on the rear side of front portion 223, extends generally in the axial direction. Connecting portion 223b of this embodiment includes: a narrowed portion 223c that is plate-shaped and has the same thickness as front portion 223, but whose cross section changes relative to the axial direction; a transition portion 223e that extends rearward from the rear end of narrowed portion 223c and gradually increases in thickness; and a rear portion 223f that extends rearward from the rear end of transition portion 223e with a constant thickness. The boundary line between narrowed portion 223c and transition portion 223e and the boundary line between transition portion 223e and rear portion 223f are both parallel to apex 222. The change in the cross section of narrowed portion 223c relative to the axial direction can be processed into a desired shape relatively easily by forming notches 223d by grinding, punching, or the like.

[0079] In addition, in this embodiment shown in Figures 17(a) and 17(b), the cross section of a plane including the boundary line between the narrowing portion 223c and the transition portion 223e is approximately rectangular (long side 5.8 mm, short side (thickness) 1.5 mm), and the cross section of a plane including the boundary line between the transition portion 223e and the rear portion 223f is approximately rectangular (long side 5.8 mm, short side (thickness) 3.2 mm).

[0080] Additionally, similar to the above-described embodiment, the rear side of the connection portion 223b of the pen tip 202 (rear side of the rear portion 223f) is provided with a cylindrical (large diameter) central portion 224 whose outer surface is clamped in the front-to-rear direction by the retaining member and the front shaft 4, and a cylindrical (small diameter) rear end portion 225 which is connected to the front end portion of the ink absorbing body 6 in a piercing manner.

[0081] According to the pen tip 202 of this embodiment, because the narrowed portion 223c of the connecting portion 223b is a plate-like member having the same thickness as the front portion 223, and because the boundary line between the narrowed portion 223c and the transition portion 223e is parallel to the apex 222 (and further because the boundary line between the transition portion 223e and the rear portion 223f is also parallel to the apex 222), the pen tip 202 can bend more flexibly when writing. Therefore, even if there is undesirable dimensional variation in the pen tip 202 (particularly even if it is too long in the axial direction), the risk of damage to the pen tip 202 when writing can be significantly reduced.

[0082] The pen tip 202 is also made of a fiber pen tip (a resin-processed fiber bundle). The pen tip 202 can also be made of any flexible material that allows ink to flow through it, and specific examples include a porous synthetic resin material with open cells, a felt pen tip, a brush pen tip, and a plastic pen tip with an axial capillary passage.

[0083] (Third embodiment) Fig. 18(a) is a side view of a holding member 303 of a writing implement according to a third embodiment of the present invention, and Fig. 18(b) is a perspective view of the holding member 303. Fig. 19(a) is a schematic perspective view of a case where a straight line is drawn using a ruler with the writing implement according to this embodiment, and Fig. 19(b) is a schematic front view thereof.

[0084] 18(a) to 19(b), the holding portion 331 of the holding member 303 of this embodiment, similar to the embodiment described using Figures 4(a) to 6(b), has a pair of extension pieces (inner extension piece 335a and outer extension piece 335b) that protrude forward (perpendicular to the rear edge portion 334) from the rear edge portion 334 of the opening 333 on both short sides of the substantially rectangular cross section of the front portion 23 of the pen tip 2. The pair of extension pieces 335a, 335b extend in a direction parallel to the extension direction of the front portion 23 of the pen tip 2, and are adapted to come into contact with the paper surface when writing.

[0085] The inside of each of the pair of extension pieces 335a, 335b is chamfered, for example, at about 45°, to form an inclined surface 335c that is roughly half of a truncated cone. By providing such an inclined surface 335c, the contact area between each extension piece 335a, 335b and the paper surface during writing is reduced (for example, only a width of about 0.2 mm contacts in a roughly arc-shaped manner (see FIG. 19(a))). This increases the pressure applied to the paper surface by extension pieces 335a, 335b, making it easier for extension pieces 335a, 335b to dig into the paper surface. This more effectively prevents handwriting from shifting in an unintended direction.

[0086] For example, as shown in FIGS. 19(a) and 19(b), when drawing a line on a piece of paper using a ruler or the like, it is much easier to draw the line as intended.

[0087] (Fourth embodiment) Fig. 20(a) is a side view of a holding member 403 of a writing implement according to a fourth embodiment of the present invention, and Fig. 20(b) is a perspective view of the holding member 403. Fig. 21(a) is a schematic perspective view of a case where a straight line is drawn using a ruler with the writing implement according to this embodiment, and Fig. 21(b) is a schematic front view thereof.

[0088] 20(a) to 21(b), the holding portion 431 of the holding member 403 of this embodiment has, similarly to the embodiment described using Figures 4(a) to 6(b), a pair of extension pieces (an inner extension piece 435a and an outer extension piece 435b) that protrude forward (perpendicular to the rear edge portion 434) from the rear edge portion 434 of the opening 433 on both short sides of the substantially rectangular cross section of the front portion 23 of the pen tip 2. The pair of extension pieces 435a, 435b extend in a direction parallel to the extension direction of the front portion 23 of the pen tip 2, and are adapted to come into contact with the paper surface when writing.

[0089] The inner surface of each of the pair of extension pieces 435a, 435b is chamfered by multiple (five in the illustrated example) inclined planes 435c. By providing these multiple inclined planes 435c, the contact area between each extension piece 435a, 435b and the paper surface during writing is reduced (for example, only a linear contact of approximately 0.1 mm width and approximately 1.4 mm length (see FIG. 21(a))). This increases the pressure applied to the paper surface by the extension pieces 435a, 435b, making it easier for the extension pieces 435a, 435b to dig into the paper surface. This more effectively prevents handwriting from shifting in an unintended direction.

[0090] For example, as shown in FIGS. 21(a) and 21(b), when drawing a line on a piece of paper using a ruler or the like, it is much easier to draw the line as intended.

[0091] (Fifth embodiment) FIG. 22(a) is a side view of a pen tip 502 of a writing implement according to a fifth embodiment of the present invention, and FIG. 22(b) is a perspective view of the pen tip 502. As shown in FIG.

[0092] The front portion 523 of the pen tip 502 extends in a linear direction inclined at an acute angle (30° in this embodiment) to the axial direction in a side view, similar to the front portion 23 of the pen tip 2 in the previous embodiment. The cross section of the front portion 523 of the pen tip 502 in the extension direction is approximately rectangular (long side 5.0 mm, short side 1 to 3.2 mm). The extension length (the length maintaining the approximately rectangular cross section) is 2.6 mm in this embodiment.

[0093] The front part 523 of the pen tip 502 is sandwiched (partially surrounded) by a pair of extending pieces of a corresponding holding member (not shown), and the top part 522 of the pen tip 502 protrudes slightly forward (diagonally forward) from the tip of the holding member. The top part 522 of the pen tip 502 is formed in a substantially straight line in a side view, and is perpendicular to the extending direction of the front part 523 of the pen tip 502.

[0094] Here, the front part 523 of the pen tip 502 has a shape that becomes thinner toward the top part 522, but the top part 522 of the pen tip 502 does not have a convex curved R-shape but is a flat surface. Therefore, the top part 522 has a smaller contact area with the paper surface during writing than the top part 22 of the pen tip 2 of the above-mentioned embodiment. This reduces the degree of "ink puddle" that may form on the paper surface when the pen tip 502 is released from the paper surface after writing.

[0095] In this embodiment, a notch 523d ​​is provided on the side of the front portion 523 of the pen tip 502 that is inclined at an acute angle with respect to the axial direction in a side view so that the front portion 523 of the pen tip 502 has a substantially rectangular parallelepiped shape. Here, in this embodiment, the front end of the notch 523d ​​is located 1.3 mm rearward of the inner end of the apex 522, and the front portion 523 of the pen tip 502 does not have a perfect rectangular parallelepiped shape. In other words, a chamfered portion 522d is provided on the side (inner side) of the tip of the front portion 523 of the pen tip 502 that is inclined at an acute angle in a side view.

[0096] This effectively prevents breakage and peeling at the tip of the inclined side (inner side) of the front portion 523 of the nib 502 at an acute angle. In particular, when the nib 502 is a fiber nib, the fibers are arranged in the axial direction during the manufacturing process. Therefore, if the tip of the inward side of the front portion 523 of the nib 502 is at a right angle, that portion becomes a collection of short fibers and is very brittle. By providing the chamfered portion 522d in that portion, the fibers constituting that portion become longer, significantly reducing brittleness and effectively preventing breakage and peeling. Even when the nib 502 is made of a porous material with open cells, if the tip of the inward side of the front portion 523 of the nib 502 is at a right angle, that portion will be very brittle. Even in this case, providing the chamfered portion 522d in that portion significantly reduces the brittleness of that portion and effectively preventing breakage and peeling.

[0097] On the other hand, connecting portion 523b on the rear side of front portion 523 of nib 502, which is continuous with front portion 523 of nib 502, extends generally in the axial direction. However, connecting portion 523b is provided with narrowed portion 523c whose cross section changes with respect to the axial direction. The front end side of narrowed portion 523c is continuous with front portion 523 of nib 502 (the cross section with respect to the extension direction of front portion 523 of nib 502 is generally rectangular), and the rear end side of narrowed portion 523c is continuous with rear portion 523f which is generally quadrangular prism-shaped (the cross section with respect to the axial direction is generally rectangular). The change in the cross section of narrowed portion 523c with respect to the axial direction can be processed into a desired shape relatively easily by forming notch 523d ​​by grinding, punching, or the like.

[0098] Additionally, similar to the above-described embodiment, the rear side of the connection portion 523b of the pen tip 502 (rear side of the rear portion 523f) is provided with a cylindrical (large diameter) central portion 524 whose outer surface is clamped in the front-to-rear direction by the retaining member and the front shaft 4, and a cylindrical (small diameter) rear end portion 525 which is connected to the front end portion of the ink absorbing body 6 in a piercing manner.

[0099] The pen tip 502 is not limited to a fiber pen tip (a resin-processed fiber bundle) or a porous synthetic resin body with open cells, but may also be a felt pen tip, a brush pen tip, a plastic pen tip with an axial capillary passage, etc. [Explanation of symbols]

[0100] 1 writing implements 2, 2' nib 22 Top 23 Front section 23b, 23b' connection 23c Constriction section 23d notch 24 Central part 25 Rear end 3, 3' holding member 31 Holding part 33 Opening 34 Trailing edge 35 Extension piece 35a Inwardly extending piece 35b Outwardly extending piece 36 1st contact wall part 4 Front axle 41 Second abutting wall part 42 Third abutting wall part 43 Vertical rib 5 rear axle 51 2nd contact wall part 6 Ink occlusion body 101 Writing instruments 102 Pen Tip 122 Top 123 Front 103 Retaining member 131 Holding part 133 Opening 134 Trailing edge 135 Extension piece 202 Pen Nib 222 Top 223 Front 223b Connection 223c Constriction section 223d notch 223e Transition 223f Rear part 224 Central part 225 Rear end 303 Retaining member 331 Holding part 333 Opening 334 Trailing edge 335a Inwardly extending piece 335b Outwardly extending piece 335c slope 403 Retaining member 431 Holding part 433 Opening 434 Trailing edge 435a Inwardly extending piece 435b Outwardly extending piece 435c inclined plane 502 Pen Nib 522 Top 523 Front 523b Connection 523c Squeezing section 523d Notch 523f Rear part 524 Central Department 525 rear end

Claims

1. The pen tip and a holding member for holding the pen tip; A writing instrument comprising: The front part of the pen tip extends in a linear direction inclined at an acute angle with respect to the axial direction in a side view, A cross section of the front part of the pen tip relative to the extension direction has a substantially rectangular shape, the holding member has a holding portion that surrounds at least a portion of the front portion of the pen tip, The holding portion has openings on both long sides of the substantially rectangular cross section of the front portion of the pen tip, The tip of the pen tip is formed in a substantially straight line in a side view and is substantially perpendicular to the extension direction of the front part of the pen tip, a rear edge of the opening is formed in a substantially straight line in a side view and is substantially parallel to the top of the pen tip; The holding portion has an extension piece that extends in a direction substantially parallel to the extension direction of the front portion of the pen tip on a short side of the substantially rectangular cross section of the front portion of the pen tip, the short side being an inner short side in a side view. A writing instrument characterized by:

2. The holding portion has a pair of extension pieces extending in a direction substantially parallel to the extension direction of the front portion of the pen tip on both short sides of the substantially rectangular cross section of the front portion of the pen tip.

2. The writing instrument according to claim 1.

3. A connecting portion on the rear side of the front portion of the pen tip that is continuous with the front portion of the pen tip extends generally in the axial direction.

3. The writing implement according to claim 1 or 2.

4. The connecting portion of the pen tip is provided with a narrowed portion whose cross section changes relative to the axial direction.

4. The writing implement according to claim 3.

5. The width of the opening is greater than the width of the long side of the substantially rectangular cross section of the front part of the pen tip.

5. The writing implement according to claim 1.

6. A barrel connected to the holding member Further provided with a rear portion of the holding member attached to a front portion of the barrel; a first abutment wall portion is formed on an inner surface of the holding member, A second abutment wall portion is formed on the inner surface of the barrel, The outer surface of the pen tip is sandwiched in the front-rear direction by the first abutment wall portion and the second abutment wall portion.

6. A writing implement according to claim 1.

7. The nib is either a fiber nib, a felt nib, a nib made of a porous material having open cells, or a plastic nib having an axial capillary passage.

7. A writing implement according to claim 1.

8. The tip of the front part of the pen tip is provided with a chamfered portion on the side that is inclined at an acute angle in a side view.

8. A writing implement according to claim 1.

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