Notebook

Abstract

To provide a writing instrument that can consistently produce handwriting with a stable and consistent line width. [Solution] The writing instrument 10 comprises a tip member 40 having a writing portion 42 that forms a line, a holding member 50 that holds the tip member 40, and a support member 60 attached to the holding member 50 and having a pair of support portions 65 that are positioned on the outside of the tip member 40, sandwiching the tip member 40.

Description

Technical Field

[0001] The present invention relates to a writing instrument.

Background Art

[0002] Conventionally, writing instruments such as marking pens having a tip member formed of a fiber tip or the like are known. Patent Document 1 discloses an example of a writing instrument in which a pen body forming a writing portion is disposed at the tip of a shaft cylinder. In the writing instrument disclosed in Patent Document 1, the pen body is tiltably supported so that the entire writing portion contacts the writing surface by the force applied to the shaft cylinder as writing is performed. According to such a writing instrument, there is an advantage that a drawing line of a constant width can be easily drawn regardless of the way of holding the shaft cylinder and the holding angle, and the range of the tilt angle at which the writing portion can be brought into close contact with the writing surface can be widened.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In a conventional marking pen, the line width of the handwriting may vary or the handwriting may be blurred depending on the angle of the pen tip with respect to the writing surface and the way the user applies the writing pressure.

[0005] The present invention has been made in consideration of such points, and an object thereof is to provide a writing instrument capable of stably forming handwriting having a constant line width.

Means for Solving the Problems

[0006] The writing instrument of the present invention [1] a tip member having a writing portion for forming handwriting, and a holding member for holding the tip member, A writing instrument comprising: a support member attached to the holding member and having a pair of support portions positioned on the outside of the tip member, sandwiching the tip member; and a writing instrument comprising a support member attached to the holding member and positioned on the outside of the tip member, sandwiching the tip member.

[0007] The writing instrument of the present invention is [2] The writing portion has a longitudinal direction and a transverse direction perpendicular to the longitudinal direction in a cross section perpendicular to the central axis of the writing instrument, The writing section is capable of bending in the transverse direction due to the pressure applied during writing, as described in [1].

[0008] The writing instrument of the present invention is [3] The retaining member includes the shaft cylinder, The support member is the writing instrument described in [1] or [2], which is attached to the barrel.

[0009] The writing instrument of the present invention is [4] The holding member includes an outer cylinder and an inner cylinder that holds the tip member and at least a portion of which is disposed inside the outer cylinder, The support member is the writing instrument described in [1] or [2], which is attached to the outer cylinder.

[0010] The writing instrument of the present invention is [5] The holding member includes an outer cylinder and an inner cylinder that holds the tip member and at least a portion of which is disposed inside the outer cylinder, The support member is the writing instrument described in [1] or [2], which is attached to the inner cylinder. [Effects of the Invention]

[0011] According to the present invention, it is possible to provide a writing instrument that can stably form handwriting with a consistent line width. [Brief explanation of the drawing]

[0012] [Figure 1] Figure 1 is a diagram showing one embodiment of the present invention, and is an external view showing an example of a writing instrument. [Figure 2] Figure 2 is a longitudinal sectional view of the writing instrument shown in Figure 1. [Figure 3] Figure 3 is a perspective view showing an enlarged front portion of the writing instrument shown in Figure 1. [Figure 4] Figure 4 is a longitudinal sectional view showing an enlarged front portion of the writing instrument shown in Figure 1. [Figure 5] Figure 5 is a cross-sectional view corresponding to line V-V in Figure 4. [Figure 6] Figure 6 is a longitudinal sectional view showing a modified example of the writing instrument. [Figure 7] Figure 7 is a longitudinal sectional view showing another modified example of the writing instrument.

Mode for Carrying Out the Invention

[0013] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. In the drawings attached to this specification, for the convenience of illustration and easy understanding, the scale, the vertical and horizontal dimensional ratios, etc. are appropriately changed and exaggerated from those of the actual object.

[0014] In addition, with regard to terms used in this specification for specifying shapes, geometric conditions, and their degrees, such as terms like "parallel", "orthogonal", "identical", etc., and values of lengths and angles, etc., they are not bound by a strict meaning and are to be interpreted including a range where similar functions can be expected.

[0015] In this specification, the direction in which the central axis A of the writing instrument 10 extends (the longitudinal direction, the vertical direction in the longitudinal sectional view) is defined as the axial direction da, the direction orthogonal to the axial direction da is the radial direction, and the direction along the circumference around the central axis A is the circumferential direction. Also, along the axial direction da, the side approaching the writing surface such as a paper surface when writing (the lower side in the longitudinal sectional view) is taken as the front, and the side moving away from the writing surface (the upper side in the longitudinal sectional view) is taken as the rear. Further, along the radial direction, the side approaching the central axis A is the inner side, and the side moving away from the central axis A is the outer side.

[0016] FIG. 1 is a view showing an embodiment of the present invention and is an external view showing an example of a writing instrument 10. FIG. 2 is a longitudinal sectional view of the writing instrument 10. FIG. 3 is a perspective view showing an enlarged front portion of the writing instrument 10. FIG. 4 is a longitudinal sectional view showing an enlarged front portion of the writing instrument 10. FIG. 5 is a cross-sectional view corresponding to line V-V in FIG. 4.

[0017] The writing instrument 10 of the present embodiment is, for example, a writing instrument such as a marking pen (marker), a sign pen (felt pen), etc. In the present embodiment, an example in which the writing instrument 10 is a marking pen will be described. The writing instrument 10 includes an ink storage body 11, a tip member 40, a holding member 50, and a support member 60. The holding member 50 is a member that holds the tip member 40. In the present embodiment, the holding member 50 includes a shaft cylinder 20.

[0018] The shaft cylinder 20 extends in the axial direction da along the central axis A of the writing instrument 10. Therefore, the central axis of the shaft cylinder 20 coincides with the central axis A of the writing instrument 10. The shaft cylinder 20 includes a front shaft 21 and a rear shaft 29 attached to the rear end portion of the front shaft 21.

[0019] The front shaft 21 is a member that forms the front portion of the writing instrument 10. The front shaft 21 has a substantially cylindrical shape. The central axis of the front shaft 21 coincides with the central axis A of the writing instrument 10. The rear shaft 29 is a member that forms the rear portion of the writing instrument 10. The rear shaft 29 has a substantially cylindrical shape. The central axis of the rear shaft 29 coincides with the central axis A of the writing instrument 10. In the present embodiment, the rear shaft 29 is intended to be grasped by a finger when the user writes with the writing instrument 10. Note that the present invention is not limited to this, and the writing instrument 10 may be configured such that the user grasps the front shaft 21 to write. In the present embodiment, the front shaft 21 is attached to the rear shaft 29 by inserting the rear end portion of the front shaft 21 into the front end portion of the rear shaft 29. For example, the front shaft 21 may be attached to the rear shaft 29 by press-fitting the rear end portion of the front shaft 21 into the front end portion of the rear shaft 29. Further, the front shaft 21 may be attached to the rear shaft 29 by the front shaft-side convex portion formed on the outer peripheral surface of the rear end portion of the front shaft 21 overcoming the rear shaft-side convex portion formed on the inner peripheral surface of the front end portion of the rear shaft 29 and being locked to the rear shaft-side convex portion.

[0020] In this embodiment, the front shaft 21 has a flange 23 and a through hole 25. The flange 23 is formed on the outer circumferential surface of the front shaft 21. When the front shaft 21 is attached to the rear shaft 29, the flange 23 may contact the front end of the rear shaft 29. The through hole 25 penetrates the center of the front shaft 21 in the axial direction da. The central axis of the through hole 25 coincides with the central axis A of the writing instrument 10. In this embodiment, in a cross section perpendicular to the central axis A, the through hole 25 has a circular shape. The through hole 25 has a stepped portion 26, which includes a surface facing forward. A tip member 40 is inserted into the through hole 25. At this time, the stepped portion 46 of the tip member 40, described later, contacts the stepped portion 26. The front shaft 21 may be fitted with a front cap that covers the tip member 40 and suppresses the drying of ink in the tip member 40.

[0021] If the inside of the barrel 20 is sealed, the inside of the barrel 20 may become negatively pressurized as the amount of ink stored in the ink reservoir 11 decreases due to repeated writing. When the inside of the barrel 20 becomes negatively pressurized, the flow of ink from the ink reservoir 11 to the writing portion 42 of the tip member 40 is obstructed. In this embodiment, a rib 24 is provided on the inner surface of the through hole 25. The rib 24 is formed to protrude from the inner surface of the through hole 25 toward the central axis A. The rib 24 extends linearly along the axial direction da. The front barrel 21 may have a plurality of ribs 24. The plurality of ribs 24 may be arranged at equal angular intervals from each other in the circumferential direction. The ribs 24 may be in contact with the outer circumferential surface of the tip member 40. When the front barrel 21 has such ribs 24, a gap is formed between the outer circumferential surface of the tip member 40 and the through hole 25 in the vicinity of the ribs 24, in particular the region between two circumferentially adjacent ribs 24. Therefore, as the amount of ink stored in the ink reservoir 11 decreases due to repeated writing, air flows into the ink reservoir 11 through this gap, preventing negative pressure from forming inside the barrel 20.

[0022] The material of the retaining member 50 (shaft cylinder 20) is selected considering factors such as strength and ease of dimensional control. The material of the retaining member 50 may be, for example, a resin material such as polypropylene or polyethylene, or a metal material such as brass or stainless steel.

[0023] The ink reservoir 11 is a component that stores ink for forming handwriting. The ink reservoir 11 has a substantially cylindrical shape. The ink reservoir 11 is located inside the barrel 20. The central axis of the ink reservoir 11 coincides with the central axis A of the writing instrument 10. The ink reservoir 11 may be, for example, a component having continuous pores that can be impregnated with ink and stored. Such an ink reservoir 11 may be, for example, a heat-fused fiber bundle, a resin-processed fiber bundle, a resin-processed felt, a needle-punched felt, a porous material such as a sponge, etc. The ink reservoir 11 may also have an outer skin formed of a synthetic resin film or the like on its outer surface.

[0024] The tip member (first tip member) 40 is a member that forms a writing mark on a writing surface such as paper. The tip member 40 is made of a material that allows ink to flow through its interior in the axial direction da. For example, the tip member 40 may be made of a porous body having open cells. Alternatively, the tip member 40 may be made of a fiber bundle, a bristle bundle, felt, a resin having capillary passages extending in the axial direction da, etc. Furthermore, the tip member 40 may be made of a porous synthetic resin having open cells.

[0025] The tip member 40 has a writing portion 42, an intermediate portion 45, and a rear end portion 48. The writing portion 42 is the part that forms the writing mark on the writing surface. At least a portion of the front of the writing portion 42 protrudes forward from the holding member 50. The writing portion 42 may have, for example, a chisel shape. However, it is not limited to this, and the writing portion 42 may have other shapes such as a bullet shape, a rectangular shape, a rectangular prism shape, or a plate shape. The writing portion 42 may be flexible and deformable in a transverse direction d2 (see Figure 5) perpendicular to the longitudinal direction d1 in the cross-section due to writing pressure.

[0026] The writing section 42 may have a ridge section 43. The ridge section 43 is the part that constitutes the tip of the writing section 42 and is intended to come into contact with the writing surface on which the writing marks are formed, such as a piece of paper. The ridge section 43 extends in a direction intersecting the central axis A. In particular, when the writing instrument 10 is viewed from the axial direction da, the ridge section 43 extends linearly in a direction perpendicular to the central axis A. When the writing instrument 10 is viewed from the side, the ridge section 43 may extend in a direction perpendicular to the central axis A, or it may extend in a direction inclined with respect to the central axis A. In the examples shown in Figures 1 to 5, when the writing instrument 10 is viewed from the side, the ridge section 43 extends in a direction inclined with respect to the central axis A.

[0027] The intermediate portion 45 is located behind the writing portion 42 and has a substantially cylindrical shape. The rear end portion 48 is located behind the intermediate portion 45. The rear end portion 48 has a shape in which the cross-sectional area decreases towards the rear. The rear end portion 48 may have shapes such as a cone, pyramidal shape, frustocone shape, or frustocone shape. In this embodiment, the rear end portion 48 has a frustocone shape in which the cross-sectional area decreases towards the rear. The rear end portion 48 is inserted into the ink reservoir 11 from the front of the ink reservoir 11. Ink can flow from the ink reservoir 11 through the rear end portion 48 and the intermediate portion 45 toward the writing portion 42. A stepped portion 46 is formed on the outer circumferential surface of the intermediate portion 45. The stepped portion 46 includes a surface facing rear. When the tip member 40 is inserted into the front shaft 21, the stepped portion 46 contacts the stepped portion 26 of the front shaft 21. In particular, in this embodiment, the tip member 40 is inserted into the through hole 25 of the front shaft 21 from the front, and the stepped portion 46 comes into contact with the stepped portion 26 of the through hole 25 and stops. As a result, the tip member 40 is held by the holding member 50 (front shaft 21).

[0028] The writing instrument 10 may further include a second tip member 12 and a rear cap 13. The second tip member 12 may be configured to form a different handwriting pattern from that formed by the writing portion 42 of the tip member 40. The rear end of the second tip member 12 protrudes rearward from the rear end of the rear barrel 29 and constitutes the writing portion that forms the handwriting pattern. The front end of the second tip member 12 is inserted into the ink reservoir 11 from the rear of the ink reservoir 11. Ink can flow from the ink reservoir 11 through the second tip member 12 toward the rear end of the second tip member 12. The rear cap 13 is detachably attached to the rear end of the rear barrel 29. The rear cap 13 covers the second tip member 12 and prevents the ink on the second tip member 12 from drying out.

[0029] The support member 60 is attached to the retaining member 50. In this embodiment, the retaining member 50 includes a shaft cylinder 20, and the support member 60 is attached to the front shaft 21 of the shaft cylinder 20. The support member 60 has a base portion 61 and a tip portion 64. The base portion 61 is a member that is attached to the retaining member 50 and supports the tip portion 64. The base portion 61 has a substantially annular shape. The base portion 61 has an engaging portion 62. The engaging portion 62 is the portion that engages with the retaining member 50 (front shaft 21). In this embodiment, the support member 60 is attached to the retaining member 50 by press-fitting the front end of the retaining member 50 into the engaging portion 62. However, it is not limited to this, and the support member 60 may also be attached to the retaining member 50 by press-fitting the rear end of the support member 60 into the retaining member 50. Furthermore, the means of attaching the support member 60 to the retaining member 50 is not limited to press-fitting. For example, the support member 60 may be attached to the holding member 50 by means of fitting, where a projection on the engaging portion 62 overcomes a projection on the front end of the holding member 50; by fitting, where a projection on one of the engaging portion 62 and the front end of the holding member 50 fits into a recess on the other; or by other means such as adhesive bonding.

[0030] The tip portion 64 is provided in front of the base portion 61. The tip portion 64 in this embodiment has a pair of support portions 65 and a pair of side portions 66. The support portions 65 are formed to protrude forward from the base portion 61. The pair of support portions 65 are arranged on the outside of the tip member 40, sandwiching the tip member 40. In other words, the tip member 40 is positioned between the pair of support portions 65. In particular, when viewed from the axial direction da, the support portions 65 are arranged on the outside of the tip member 40 in the longitudinal direction d1 of the writing portion 42. The front end of the support portion 65 is located behind the front end of the writing portion 42. When viewed from the transverse direction d2 of the writing portion 42 of the tip member 40, the straight line connecting the front ends of the pair of support portions 65 may extend parallel to the ridge portion 43.

[0031] The support portion 65 is intended to contact the writing surface, such as paper, when writing with the writing instrument 10. In this embodiment, the writing portion 42 has flexibility that allows it to bend and deform in the transverse direction d2 (see Figure 5), which is perpendicular to the longitudinal direction d1 in the cross-section, due to writing pressure. When writing, the support portion 65 contacts the writing surface, allowing the amount of bending of the writing portion 42 to be controlled within a predetermined range. This prevents the writing portion 42 from being damaged or broken due to excessive bending. Furthermore, by moving the writing instrument 10 while the two support portions 65 remain in contact with the writing surface, the writing portion 42 can form a handwriting mark with a constant amount of bending. Therefore, it becomes possible to form a handwriting mark with a stable and constant line width.

[0032] The pair of side portions 66 are positioned on the outside of the tip member 40, with the tip member 40 in between. In other words, the tip member 40 is positioned between the pair of side portions 66. In particular, when viewed from the axial direction da, the side portions 66 are positioned on the outside of the tip member 40 in the transverse direction d2 of the writing portion 42, and extend parallel to the longitudinal direction d1 of the writing portion 42, connecting the pair of support portions 65 to each other.

[0033] An opening 67 is formed in front of the side portion 66. When viewed from the transverse direction d2 of the writing portion 42, the opening 67 has a roughly rectangular shape, particularly a roughly parallelogram shape. Three sides of the opening 67 are composed of a pair of support portions 65 and one side portion 66. The front end of the opening 67 is open to the front. The rear end edge 68 of the opening 67 coincides with the front end edge of the side portion 66. The rear end edge 68 may extend parallel to the ridge portion 43 of the writing portion 42 when viewed from the transverse direction d2 of the writing portion 42. In this case, the load on the tip member 40 due to the bending of the tip member 40 is uniformly applied to the writing portion 42, localized stress concentration in the writing portion 42 is avoided, and the lifespan of the writing portion 42 can be extended.

[0034] The material of the support member 60 is selected considering its strength and slipperiness on writing surfaces such as paper. The material of the support member 60 may be, for example, a resin material such as polypropylene, polyethylene, or polyacetal.

[0035] The writing instrument 10 of this embodiment comprises a tip member 40 having a writing portion 42 that forms a writing line, a holding member 50 that holds the tip member 40, and a support member 60 attached to the holding member 50 and having a pair of support portions 65 that are positioned on the outside of the tip member 40, sandwiching the tip member 40.

[0036] In the writing instrument 10 of this embodiment, the writing section 42 has a longitudinal direction d1 and a transverse direction d2 perpendicular to the longitudinal direction d1 in a cross section perpendicular to the central axis A of the writing instrument 10, and the writing section 42 is capable of bending in the transverse direction d2 due to the pressure applied when writing.

[0037] With this writing instrument 10, the amount of deflection of the writing section 42 can be controlled within a predetermined range by the support section 65 contacting the writing surface during writing. This prevents the writing section 42 from being damaged or broken due to excessive deflection. Furthermore, by moving the writing instrument 10 while the two support sections 65 remain in contact with the writing surface, the writing section 42 can form a handwriting line with a constant amount of deflection. Therefore, it becomes possible to form a handwriting line with a stable and consistent line width.

[0038] Furthermore, in this embodiment, the writing instrument 10 is configured such that the holding member 50 and the support member 60 are manufactured separately and assembled together. With such a writing instrument 10, the holding member 50 and the support member 60 can be manufactured from different materials. For example, the material of the holding member 50 (shaft 20) can be selected with priority given to ease of dimensional control. The material of the support member 60 can be selected with priority given to slipperiness on the writing surface. This makes it possible to construct the holding member 50 and the support member 60 from more appropriate materials.

[0039] In the writing instrument 10 of this embodiment, the holding member 50 includes the barrel 20, and the support member 60 is attached to the barrel 20.

[0040] With this type of writing instrument 10, the support member 60 is attached to the barrel 20, which prevents the support part 65 from wobbling when pressure is applied to it.

[0041] Modifications of this embodiment will be described with reference to Figures 6 and 7. In the following description and the drawings used therein, parts that can be configured in the same way as in the above-described embodiment will be given the same reference numerals as those used for the corresponding parts in the above-described embodiment, and redundant explanations will be omitted.

[0042] Figure 6 shows a modified example of the writing instrument 10, and is a longitudinal cross-sectional view showing an enlarged view of the front portion of the writing instrument 10.

[0043] In this modified example, the retaining member 50 includes an outer cylinder 51 and an inner cylinder 52. In this modified example, the front shaft 21 of the shaft cylinder 20 constitutes the outer cylinder 51. A stepped portion 27 and an inclined surface 28 are formed on the inner surface of the outer cylinder 51 (front shaft 21). The stepped portion 27 includes a surface facing forward. The inclined surface 28 extends in a direction that is inclined with respect to both the axial direction da and the radial direction, so as it moves toward the rear.

[0044] The support member 60 is attached to the outer cylinder 51 (front shaft 21) of the retaining member 50. In this embodiment, the support member 60 is attached to the retaining member 50 by press-fitting the rear end portion (engaging portion 62) of the support member 60 into the outer cylinder 51.

[0045] The inner cylinder 52 is a component that contacts the tip member 40 and directly holds the tip member 40. At least a portion of the inner cylinder 52 is positioned inside the outer cylinder 51. In this modified example, the entire inner cylinder 52 is positioned inside the outer cylinder 51. The inner cylinder 52 has a substantially cylindrical shape. The central axis of the inner cylinder 52 coincides with the central axis A of the writing instrument 10. The inner cylinder 52 has a flange portion 54 and a claw portion 56. The flange portion 54 is formed on the outer circumferential surface of the inner cylinder 52. In particular, in the example shown in Figure 6, the flange portion 54 is formed on the outer circumferential surface of the front end of the inner cylinder 52. When the inner cylinder 52 is attached to the outer cylinder 51, the flange portion 54 contacts the stepped portion 27 of the outer cylinder 51 from the front.

[0046] The claw portion 56 has the function of restricting the axial movement da of the tip member 40 relative to the inner cylinder 52 when the inner cylinder 52 is attached to the outer cylinder 51 (front shaft 21). The claw portion 56 extends rearward from the main body of the inner cylinder 52. When the tip member 40 is placed inside the inner cylinder 52, the claw portion 56 is positioned radially outward relative to the tip member 40. The rear end of the claw portion 56 is configured to be deformable so that it can move radially inward. In particular, the claw portion 56 may be configured to be elastically deformable radially inward.

[0047] The inner cylinder 52 may have a plurality of claw portions 56. The plurality of claw portions 56 may be arranged with equal angular pitches to each other in the circumferential direction. For example, the inner cylinder 52 may have four claw portions 56. The four claw portions 56 may be arranged with 90-degree angular pitches to each other. However, the inner cylinder 52 may have two, three, or five or more claw portions 56. In particular, it is preferable that the inner cylinder 52 has three or more claw portions 56.

[0048] The claw portion 56 has a projection 58. The projection 58 is formed to protrude radially outward from the outer circumferential surface of the claw portion 56. When the inner cylinder 52 is attached to the outer cylinder 51, if the inner cylinder 52 is inserted into the outer cylinder 51 from the front, the projection 58 is guided by the inclined surface 28 of the outer cylinder 51 and receives a pressing force from the outer cylinder 51 that deforms the claw portion 56 radially inward. Because the claw portion 56 has a projection 58, the radial thickness of the main body portion of the claw portion 56 can be reduced. Therefore, the claw portion 56 can be easily deformed radially inward. As the claw portion 56 deforms inward, a large frictional force acts between the outer circumferential surface of the tip member 40 and the claw portion 56. As a result, the tip member 40 is held in place by the inner cylinder 52.

[0049] The inner cylinder 52 is formed, for example, by injection molding of a synthetic resin. Examples of synthetic resins used to form the inner cylinder 52 include polypropylene, polycarbonate, polyethylene, polyacetal, polyethylene terephthalate, elastomer, and acrylonitrile-butadiene-styrene (ABS) resin.

[0050] In this modified example, the claw portion 56 deforms inward and contacts the tip member 40, allowing the claw portion 56 to grip the tip member 40 with a relatively large force, thereby restricting the axial movement da of the tip member 40 relative to the inner cylinder 52. As a result, even if a backward force is applied to the tip member 40 due to writing pressure with the writing instrument 10, the tip member 40 is prevented from moving backward relative to the inner cylinder 52. Furthermore, even if an impact such as dropping is applied to the writing instrument 10, and a force is applied to the tip member 40 due to the impact, the tip member 40 is prevented from moving axially da relative to the inner cylinder 52. Therefore, the tip member 40 can be fixed more firmly with a simpler configuration.

[0051] In this modified writing instrument 10, the holding member 50 includes an outer cylinder 51 and an inner cylinder 52 that holds the tip member 40 and at least a portion of which is located inside the outer cylinder 51, and the support member 60 is attached to the outer cylinder 51.

[0052] In this type of writing instrument 10, the outer cylinder 51 and the inner cylinder 52 are manufactured separately and assembled together. With this type of writing instrument 10, the outer cylinder 51 and the inner cylinder 52 can be manufactured from different materials. This makes it possible to construct the outer cylinder 51 and the inner cylinder 52 from more appropriate materials.

[0053] Figure 7 shows another variation of the writing instrument 10, and is a longitudinal cross-sectional view showing an enlarged view of the front portion of the writing instrument 10.

[0054] In this modified example, similar to the modified example described with reference to Figure 6, the retaining member 50 includes an outer cylinder 51 (front shaft 21) and an inner cylinder 52. An inclined surface 28 is formed on the inner surface of the outer cylinder 51 (front shaft 21).

[0055] When the inner cylinder 52 is attached to the outer cylinder 51, the flange 54 of the inner cylinder 52 contacts the front end of the outer cylinder 51 from the front. Therefore, in this modified example, the portion of the inner cylinder 52 located behind the flange 54 is positioned inside the outer cylinder 51. On the other hand, the flange 54 of the inner cylinder 52 and the portion located in front of the flange 54 are positioned outside the outer cylinder 51.

[0056] The support member 60 is attached to the inner cylinder 52 of the retaining member 50. In this modified example, the support member 60 is attached to the retaining member 50 by press-fitting the front end of the retaining member 50 (inner cylinder 52) into the engaging portion 62 of the support member 60.

[0057] In this modified writing instrument 10, the holding member 50 includes an outer cylinder 51 and an inner cylinder 52 that holds the tip member 40 and at least a portion of which is located inside the outer cylinder 51, and the support member 60 is attached to the inner cylinder 52.

[0058] With this writing instrument 10, similar to the modified example described with reference to Figure 6, the outer cylinder 51 and the inner cylinder 52 are manufactured separately and assembled together. With this writing instrument 10, the outer cylinder 51 and the inner cylinder 52 can be manufactured from different materials. This makes it possible to construct the outer cylinder 51 and the inner cylinder 52 from more appropriate materials. [Explanation of Symbols]

[0059] 10 Writing instruments 11 Ink reservoir 12. Second tip component 13 Rear cap 20 shaft cylinder 21 Front axle 23 Guard section 25 Through holes 26 Step section 27 Stepped section 28 Slope 29 rear axle 40 Chip components 40 First chip component 42 Writing section 43 Ridge section 45 Middle section 46 Step part 48 Rear end 50 Retaining member 51 Outer cylinder 52 Inner cylinder 54 Guard section 56 Nail part 58 Protrusion 60 Support member 61 Base 62 Engaging part 64 Tip 65 Support part 66 Side part 67 Aperture 68 Trailing edge A Center axis da axis direction d1 Longitudinal direction d2 Transverse direction

Claims

1. A tip member having a writing portion that forms a handwriting line, A holding member for holding the chip member, A writing instrument comprising: a support member attached to the holding member and having a pair of support portions positioned outside the tip member, sandwiching the tip member; and a writing instrument comprising a support member.

2. The writing portion has a longitudinal direction and a transverse direction perpendicular to the longitudinal direction in a cross-section perpendicular to the central axis of the writing instrument. The writing instrument according to claim 1, wherein the writing portion is capable of bending in the transverse direction due to the pressure applied during writing.

3. The retaining member includes the shaft cylinder, The writing instrument according to claim 1 or 2, wherein the support member is attached to the barrel.

4. The holding member includes an outer cylinder and an inner cylinder that holds the tip member and at least a portion of which is positioned inside the outer cylinder. The writing instrument according to claim 1 or 2, wherein the support member is attached to the outer cylinder.

5. The holding member includes an outer cylinder and an inner cylinder that holds the tip member and at least a portion of which is positioned inside the outer cylinder. The writing instrument according to claim 1 or 2, wherein the support member is attached to the inner cylinder.

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