Writing instrument

Abstract

The invention provides a writing instrument. A writing instrument (10) is provided with: a shaft tube (15) including a front shaft (20) and a rear shaft (40) attached to the front shaft (20) from the rear, the front portion of the rear shaft (40) having a cylindrical shape; and a pen body (90) having a writing portion (52) on which handwriting is formed, the rear shaft (40) having a cutout portion (43) extending rearward from the front end of the rear shaft (40), the front shaft (20) having an identification portion (31) located within the cutout portion (43) and capable of identifying the orientation of the pen body (90), the identification portion (31) including a first surface (35) and a second surface (36) located rearward of the first surface (35), the first surface (35) being a plane parallel to the central axis (A) of the shaft tube (15), the second surface (36) being a plane parallel to the central axis (A) of the shaft tube (15), and the second surface (36) being a plane parallel to the central axis (A) of the shaft tube (15). The second surface (36) is a surface farther from the central axis (A) toward the rear.

Description

Technical Field

[0001] The present invention relates to writing instruments. Background Art

[0002] In the past, there are known writing tools that write by bringing the pen tip facing a specified direction into contact with a writing surface such as a paper surface. As such writing tools, markers, fountain pens, etc. can be cited. JP2019-155879A describes a writing tool with a direction recognition unit. With respect to this writing tool, when writing, the user holds the writing tool in such a way that the direction recognition unit is located at the top, so that the direction of the pen tip becomes a direction suitable for writing. As a result, there is the following advantage: when writing, there is no need to visually confirm the direction of the pen tip, and writing can be performed immediately after removing the cap to expose the pen tip.

[0003] In the writing tool described in JP2019-155879A, the direction identification part (identification part) is formed integrally with the surrounding parts (front axle), so it is sometimes difficult for the user to visually confirm the identification part. In order to facilitate visual confirmation of the identification part, it is also considered to color the identification part, but the process for coloring will be increased, and the manufacturing cost of the writing tool may increase. Summary of the invention

[0004] The present invention has been made in consideration of such a point, and is intended to improve the visibility of the identification portion with a simple structure.

[0005] Regarding the writing tool of the present invention, [1] the writing tool comprises: a shaft cylinder, which includes a front shaft and a rear shaft installed on the front shaft from the rear, the front part of the rear shaft has a cylindrical shape; and a pen body, which has a writing part that forms handwriting, the rear shaft has a cutout part extending backward from the front end of the rear shaft, the front shaft has an identification part located in the cutout part and capable of identifying the orientation of the pen body, the identification part includes a first surface and a second surface located behind the first surface, the first surface is a plane parallel to the central axis of the shaft cylinder, and the second surface is a surface that is farther away from the central axis as it moves toward the rear.

[0006] Regarding the writing tool of the present invention, [2] according to the writing tool described in [1], wherein the first surface has a rectangular shape, the second surface has a semicircular shape or a semi-elliptical shape, and the cutout portion has a complementary shape relative to the identification portion.

[0007] Regarding the writing tool of the present invention, [3] the writing tool according to [1] or [2], wherein the writing tool has two identification parts, and the two identification parts are arranged at an angular interval of 180 degrees in the circumferential direction.

[0008] Regarding the writing tool of the present invention, [4] according to the writing tool described in [2], wherein the writing portion has a ridge portion, the ridge portion is intended to contact the writing surface for forming handwriting, when the writing tool is observed from the front, the ridge portion extends in a straight line along the first direction, and the two identification portions are respectively arranged on straight lines passing through the central axis and perpendicular to the central axis and the first direction.

[0009] Regarding the writing tool of the present invention, [5] according to any one of [1] to [4], the front shaft has a flange portion that contacts the front end of the rear shaft, and the flange portion extends circumferentially from the front end portion of the identification portion.

[0010] Regarding the writing tool of the present invention, [6] a writing tool according to any one of [1] to [5], wherein a rear axis side sealing portion is arranged behind the identification portion, and the rear axis side sealing portion includes a first annular protrusion formed on the outer surface of the front axis, and the first annular protrusion is in close contact with the inner surface of the rear axis.

[0011] Regarding the writing tool of the present invention, [7] according to any one of [1] to [6], the writing tool has a locking portion arranged on the outer surface of the front shaft behind the identification portion and a locked portion arranged on the inner surface of the rear shaft, and when the front shaft is installed on the rear shaft, the locking portion is locked to the locked portion.

[0012] Regarding the writing tool of the present invention, [8] the writing tool according to any one of [1] to [7], wherein the writing tool also has a cap mounted on the front shaft.

[0013] Regarding the writing tool of the present invention, [9] according to the writing tool described in [8], wherein a cap side sealing portion is arranged between the cap and the front shaft, and the cap side sealing portion includes a second annular protrusion formed on the inner surface of the cap, and the second annular protrusion is in close contact with the outer surface of the front shaft.

[0014] Regarding the writing instrument of the present invention,

[10] According to any one of [1] to [9], the maximum width dimension of the cutout portion is greater than or equal to 30% and less than or equal to 50% of the outer diameter of the front end of the rear shaft.

[0015] Regarding the writing instrument of the present invention,

[11] according to any one of [1] to

[10] , wherein the axial length of the cutout portion is greater than 50% and less than 150% of the outer diameter of the front end of the rear shaft.

[0016] Regarding the writing instrument of the present invention,

[12] The writing instrument according to any one of [1] to

[11] , wherein the identification portion has a color different from a color of an outer surface of the rear shaft.

[0017] Regarding the writing tool of the present invention,

[13] the writing tool according to any one of [1] to

[12] , wherein the identification portion has a color corresponding to the color of ink contained in the writing tool.

[0018] According to the present invention, the visibility of the identification portion can be improved with a simple structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 1 is a diagram showing one embodiment of the present invention, and is an external perspective view showing an example of a writing tool.

[0020] Figure 2 This is a diagram showing the appearance of the writing instrument with the cap removed.

[0021] Figure 3 yes Figure 2 A longitudinal section view of a writing instrument.

[0022] Figure 4 Observe from the front Figure 1 of writing implements.

[0023] Figure 5 is a perspective view showing the front and rear axes of the writing instrument.

[0024] Figure 6 2 is a diagram showing the appearance of the front axle.

[0025] Figure 7 It is a longitudinal sectional view showing the rear axle.

[0026] Figure 8 This is a diagram showing a state in which the front axle and the rear axle are assembled to each other.

[0027] Fig. 9 It is a longitudinal sectional view showing the cap portion.

[0028] Fig.10 This is a diagram showing a state in which the front shaft and the cap are assembled to each other. DETAILED DESCRIPTION

[0029] Hereinafter, one embodiment of the present invention will be described with reference to the accompanying drawings. In addition, in the drawings attached to this specification, for the sake of ease of illustration and understanding, the scale and aspect ratio are appropriately changed and exaggerated relative to the scale and aspect ratio of the actual object.

[0030] In addition, terms such as "parallel", "perpendicular", "same", and values ​​of lengths and angles used in this specification to determine shapes, geometric conditions, and their degrees are not restricted in a strict sense, but are interpreted to include the range of degrees that can be expected to have the same function.

[0031] In this specification, the direction in which the central axis A of the writing tool 10 extends (the length direction, the up-down direction in the longitudinal section view) is defined as the axial direction da, the direction perpendicular to the axial direction da is defined as the radial direction, and the direction along the circumference around the central axis A is defined as the circumferential direction. In addition, along the axial direction da, the side close to the writing surface such as the paper surface when writing (the upper side in the longitudinal section view) is defined as the front, and the side away from the writing surface (the lower side in the longitudinal section view) is defined as the rear. In addition, along the radial direction, the side close to the central axis A is defined as the inner side or the inner side, and the side away from the central axis A is defined as the outer side or the outer side.

[0032] Figure 1 1 is a diagram showing one embodiment of the present invention, and is an external perspective view showing an example of a writing instrument 10 . Figure 2 1 is an external view showing the writing instrument 10 in a state where the cap 14 is removed. Figure 3 It is a longitudinal sectional view of the writing instrument 10 . Figure 4 This is a diagram showing writing instrument 10 as viewed from the front.

[0033] The writing implement 10 of the present embodiment is a writing implement for writing by making the pen tip facing a predetermined direction contact with a writing surface such as a paper surface. The writing implement 10 may be, for example, a writing implement such as a marker (marker) or a fountain pen. In the present embodiment, an example in which the writing implement 10 is a marker pen is described. The writing implement 10 has an ink storage body 11, a barrel 15, and a pen body 90. The barrel 15 includes a front shaft 20 and a rear shaft 40 mounted on the rear end portion of the front shaft 20.

[0034] The ink storage body 11 is a component for storing ink for forming handwriting. The ink storage body 11 has a roughly cylindrical shape. The ink storage body 11 is arranged in the shaft cylinder 15. The central axis of the ink storage body 11 is consistent with the central axis A of the writing tool 10. The ink storage body 11 can be, for example, a component having continuous pores that can allow ink to be impregnated and stored. Such an ink storage body 11 can also be, for example, a heat-welded body of a fiber bundle, a resin-processed body of a fiber bundle, a resin-processed body of felt, a needle-punched body of felt, a porous body such as a sponge, etc. In addition, the ink storage body 11 can have an outer skin formed of a synthetic resin film or the like on its outer peripheral surface.

[0035] The pen body 90 is a component for forming handwriting on a writing surface such as a paper surface. The pen body 90 of the present embodiment includes a pen head component 50 and a retaining component 70. In addition, the retaining component 70 may also be omitted. In this case, the pen head component 50 may also be directly mounted on the shaft cylinder 15 (front shaft 20).

[0036] The pen tip member (first pen tip member) 50 is a member for forming handwriting on a writing surface such as a paper surface. The pen tip member 50 is formed of a material that allows ink to flow in the axial direction da. For example, the pen tip member 50 may also be composed of a porous body having continuous bubbles. In addition, the pen tip member 50 may also be composed of a fiber bundle, a hair bundle, a felt, a resin having a capillary passage extending in the axial direction da, and the like.

[0037] The pen tip component 50 has a writing portion 52, a middle portion 54, and a rear end portion 56. The writing portion 52 is a portion that forms handwriting on the writing surface. At least a portion of the front of the writing portion 52 protrudes forward from the retaining component 70. The writing portion 52 may have, for example, a chisel shape. Not limited thereto, the writing portion 52 may also have other shapes such as a shell shape, a rectangular shape, a quadrangular prism shape, a plate shape, or the like. The writing portion 52 may have a shape that can be adjusted in a direction perpendicular to the length direction (lateral, Figure 4 Flexibility of flexural deformation in the left and right directions (in the middle).

[0038] The middle portion 54 is located behind the writing portion 52 and has a generally cylindrical shape. At least a portion of the middle portion 54 is held by the inner surface of the holding member 70. For example, at least a portion of the middle portion 54 may be held by an inner rib formed on the inner surface of the holding member 70. The rear end portion 56 is located behind the middle portion 54. The rear end portion 56 has a shape whose cross-sectional area decreases toward the rear. The rear end portion 56 may have, for example, a cone shape, a pyramid shape, a truncated cone shape, a truncated pyramid shape, or the like. In the present embodiment, the rear end portion 56 has a truncated cone shape whose cross-sectional area decreases toward the rear. The rear end portion 56 is inserted into the ink storage body 11 from the front of the ink storage body 11. Ink can flow from the ink storage body 11 toward the writing portion 52 through the rear end portion 56 and the middle portion 54.

[0039] like Figure 2 to Figure 4 As shown, the writing portion 52 may have a ridge portion 53. The ridge portion 53 is a portion constituting the front end of the writing portion 52, and is intended to come into contact with a writing surface such as a paper surface on which handwriting is formed. The ridge portion 53 extends linearly in a direction that is consistent with the length direction of the writing portion 52 when the writing tool 10 is observed from the front. The direction that is consistent with the length direction of the writing portion 52 when the writing tool 10 is observed from the front is set as the first direction d1. In this case, the ridge portion 53 extends linearly along the first direction d1 when the writing tool 10 is observed from the front. In addition, as shown in Figure 2 and Figure 3 When the writing tool 10 is viewed from the side as shown, the ridge line 53 may extend in a direction perpendicular to the central axis A or in a direction inclined relative to the central axis A. Figure 2 and Figure 3 In the example shown, the ridge line portion 53 extends in a direction inclined with respect to the central axis A.

[0040] The holding member 70 is a member for holding the pen tip member 50. The holding member 70 is mounted on the front end of the shaft cylinder 15. Figure 1 and Figure 2 In the example shown, the holding member 70 is attached to the front end of the front shaft 20. The holding member 70 has a substantially cylindrical shape. The central axis of the holding member 70 coincides with the central axis A of the writing tool 10. The holding member 70 is formed by injection molding of a synthetic resin, for example.

[0041] The holding member 70 may also have a locking portion that is locked with a locked portion provided on the front axle 20. The locking portion may be, for example, a convex portion or a concave portion formed on the outer peripheral surface of the holding member. For example, the locking portion may be an annular convex portion formed on the outer peripheral surface of the holding member and extending in the circumferential direction. In addition, the locked portion may be an annular convex portion formed on the inner peripheral surface of the front axle and extending in the circumferential direction. In this case, when the holding member is mounted on the front axle, the locking portion passes over the locked portion and is locked to the locked portion. Thus, the holding member is prevented from slipping out of the front axle forward. In addition, the locking portion is not limited to an annular convex portion, and may, for example, be an annular concave portion formed on the outer peripheral surface of the holding member and extending in the circumferential direction. In this case, the locking portion is locked to the locked portion by embedding the convex portion of the locked portion into the concave portion of the locking portion. In addition, the locked portion of the front axle may, for example, be an annular concave portion formed on the inner peripheral surface of the front axle and extending in the circumferential direction. In this case, the locking portion is locked to the locked portion by fitting the convex portion of the locking portion into the concave portion of the locked portion.

[0042] The holding member 70 may include a flange portion 75 and a support portion 78. The flange portion 75 is formed on the outer peripheral surface of the holding member 70. When the holding member 70 is mounted on the front axle 20, the flange portion 75 may contact the front end of the front axle 20.

[0043] The support portion 78 is formed in a manner protruding forward from the main body of the retaining member 70. In the present embodiment, the retaining member 70 has two support portions 78, and the writing portion 52 of the pen tip member 50 is arranged between the two support portions 78. The intention is that the support portion 78 contacts a writing surface such as a paper surface when writing is performed using the writing tool 10. The front end of the support portion 78 is located behind the front end of the writing portion 52. In particular, the straight line connecting the front ends of the two support portions 78 is located behind the ridge portion 53 of the writing portion 52. In the present embodiment, the writing portion 52 has a direction perpendicular to the length direction (lateral, horizontal) in the cross section that can be moved by pen pressure. Figure 4 The writing tool 10 has the flexibility to bend and deform in the left and right directions (in the left and right directions). When writing, the bending amount of the writing part 52 can be controlled within a specified range by the support part 78 being in contact with the writing surface. As a result, it is possible to prevent the writing part 52 from being damaged or broken due to the increased bending amount of the writing part 52. In addition, by moving the writing tool 10 in a state where the two support parts 78 are in contact with the writing surface, the writing part 52 can have a certain bending amount to form handwriting. Therefore, stable handwriting can be formed.

[0044] The barrel 15 extends in the axial direction da along the central axis A of the writing instrument 10. Therefore, the central axis of the barrel 15 coincides with the central axis A of the writing instrument 10. The barrel 15 includes a front shaft 20 and a rear shaft 40 mounted on the rear end portion of the front shaft 20.

[0045] The front shaft 20 is a component that forms the front part of the writing tool 10. The front shaft 20 has a generally cylindrical shape. The central axis of the front shaft 20 is consistent with the central axis A of the writing tool 10. The rear shaft 40 is a component that forms the rear part of the writing tool 10. The rear shaft 40 has a generally cylindrical shape. The central axis of the rear shaft 40 is consistent with the central axis A of the writing tool 10. In the present embodiment, it is intended that the user holds the rear shaft 40 with his fingers when writing with the writing tool 10. The rear shaft 40 may include an inner shaft and a grip portion disposed on the outer side of the inner shaft. The grip portion is a portion that the user holds with his fingers when writing with the writing tool 10. In addition, without limitation thereto, the writing tool 10 may also be configured so that the user holds the front shaft 20 for writing. In the present embodiment, the front shaft 20 is mounted on the rear shaft 40 by inserting the rear end portion of the front shaft 20 into the front end portion of the rear shaft 40. For example, the front axle 20 may be mounted on the rear axle 40 by pressing the rear end of the front axle 20 into the front end of the rear axle 40. Alternatively, the front axle 20 may be mounted on the rear axle 40 by allowing a front axle-side convex portion formed on the outer circumferential surface of the rear end of the front axle 20 to pass over a rear axle-side convex portion formed on the inner circumferential surface of the front end of the rear axle 40 and to be locked to the rear axle-side convex portion.

[0046] A front cap (cap portion) 14 may be mounted on the front shaft 20. The cap portion 14 is detachably mounted on the front portion of the front shaft 20. The cap portion 14 covers the pen tip member 50 to prevent the ink in the pen tip member 50 from drying.

[0047] Figure 5 is a perspective view showing the front axle 20 and the rear axle 40, Figure 6 is an external view showing the front axle 20, Figure 7 It is a longitudinal sectional view showing the rear axle 40 .

[0048] The front portion of the rear shaft 40 has a cylindrical shape. In this case, when the cap 14 is mounted on the shaft tube 15 or the pen head component 50 is immersed in the shaft tube 15, it is difficult for the user to grasp the direction of the writing portion 52 when the writing portion 52 of the pen head component 50 cannot be visually confirmed from the outside. Therefore, in the present embodiment, in the writing tool 10 having the rear shaft 40 having a cylindrical front portion, an identification portion 31 is provided so that the direction of the writing portion 52 can be easily grasped even when the writing portion 52 of the pen head component 50 cannot be visually confirmed from the outside. The identification portion 31 is described below.

[0049] The rear axle 40 has a cutout portion 43 extending rearward from the front end 41 of the rear axle 40. It is intended that the identification portion 31 is located in the cutout portion 43. The cutout portion 43 has a substantially U-shaped shape when viewed from the radial direction. Specifically, when viewed from the radial direction, the cutout portion 43 has an outline including a pair of straight portions 44 extending along the axial direction da and a curved portion 45 connecting the rear ends of the pair of straight portions 44 and bulging toward the rear. The curved portion 45 may be a portion of a circle (arc) or a portion of an ellipse.

[0050] The rear axle 40 may have a locked portion 47. The locked portion 47 is a portion for a later-described locking portion 65 of the front axle 20 to be locked when the front axle 20 is mounted on the rear axle 40. The locked portion 47 may be, for example, a convex portion or a concave portion formed on the inner circumferential surface of the rear axle 40. In the present embodiment, the locked portion 47 is an annular convex portion formed on the inner circumferential surface of the rear axle 40 and extending in the circumferential direction.

[0051] A convex portion 30 is formed on the outer peripheral surface of the front shaft 20. The outer peripheral edge of the convex portion 30 faces the inner peripheral edge of the cutout portion 43 and is close to the inner peripheral edge of the cutout portion 43. The surface of the convex portion 30 facing the outer side in the radial direction constitutes an identification portion 31 that can identify the direction of the pen body 90. The convex portion 30 is located inside the cutout portion 43 of the rear shaft 40. Therefore, when viewed from the radial direction, the identification portion 31 is also located inside the cutout portion 43 of the rear shaft 40. The identification portion 31 is configured to be visually confirmed from the outside and functions as a display portion that shows the direction of the pen body 90 (writing portion 52).

[0052] When viewed from the radial direction, the identification portion 31 has a profile having a complementary shape to that of the cutout portion 43 of the rear axle 40. In other words, when viewed from the radial direction, the cutout portion 43 has a profile having a complementary shape to that of the identification portion 31. Figure 1 and Figure 2 In the example shown, the identification portion 31 has a substantially U-shape when viewed from the radial direction. Specifically, when viewed from the radial direction, the identification portion 31 has a profile including a pair of straight portions 32 extending along the axial direction da and a curved portion 33 connecting the rear ends of the pair of straight portions 32 and bulging toward the rear. The curved portion 33 may be a portion of a circle (arc) or a portion of an ellipse.

[0053] The rear shaft 40 is disposed in most of the periphery of the identification portion 31. Therefore, when the writing instrument 10 is visually confirmed from the outside, the identification portion 31 can be visually confirmed in distinction from the rear shaft 40. Thus, even if the identification portion 31 is not colored, the visual confirmation of the identification portion 31 is improved. That is, the visual confirmation of the identification portion 31 can be improved with a simple structure without increasing the manufacturing cost of the writing instrument 10.

[0054] The identification portion 31 may also have a color different from the color of the outer surface of the rear shaft 40. Thus, it is easier to distinguish the identification portion 31 from the rear shaft 40 and visually confirm the identification portion 31. The identification portion 31 may also have a color corresponding to the color of the ink contained in the writing tool 10 (ink storage body 11). In this case, the user can easily grasp the color of the handwriting formed by the writing tool 10. The color corresponding to the color of the ink contained in the writing tool 10 includes not only the same color as the color of the ink, but also a color similar to the color of the ink.

[0055] The front axle 20 may be formed of a material different from that of the rear axle 40. In this way, the identification portion 31 has an appearance different from that of the rear axle 40. Thus, the identification portion 31 can be visually recognized more easily in distinction from the rear axle 40.

[0056] The front shaft 20 may also have a plurality of identification parts 31. In particular, the front shaft 20 may have two identification parts 31. The two identification parts 31 may be arranged at an angle interval of 180 degrees in the circumferential direction. As described above, the ridgeline part 53 of the pen tip component 50 extends along the first direction d1. In this embodiment, as shown in FIG. Figure 4 As shown, when the writing tool 10 is viewed from the front, the two identification parts 31 are respectively arranged on a straight line L perpendicular to the first direction (the length direction of the writing part 52) ​​d1. In other words, the two identification parts 31 are respectively arranged on a straight line L passing through the central axis A and perpendicular to the central axis A and the first direction (the length direction of the writing part 52) ​​d1. In particular, the circumferential center of each identification part 31 is located on the straight line L.

[0057] The identification part 31 includes the first surface 35 and the second surface 36. The second surface 36 is located at the rear of the first surface 35. In particular, the front end of the second surface 36 is connected to the rear end of the first surface 35. The first surface 35 is a plane parallel to the central axis A. The second surface 36 is a surface that is further away from the central axis A toward the rear. The second surface 36 can be a plane or a curved surface. For example, the second surface 36 can also be a concave curved surface that bulges toward the central axis A and the rear. When observed from the radial direction, the first surface 35 has a rectangular shape. In addition, when observed from the radial direction, the second surface 36 has a semicircular shape or a semi-elliptical shape. When the identification part 31 has the second surface 36, when the user removes the cap 14 from the front axle 20, by placing a finger on the second surface 36, the second surface 36 functions as an anti-slip portion. Therefore, the user can easily remove the cap 14 from the front axle 20.

[0058] A flange portion 21 is formed on the outer peripheral surface of the front axle 20. When the front axle 20 is mounted on the rear axle 40, the flange portion 21 may be in contact with the front end of the rear axle 40. The flange portion 21 may extend circumferentially from the front end portion 38 of the identification portion 31. In this case, the identification portion 31 can be extended to the area where the flange portion 21 should be formed. That is, the area of ​​the identification portion 31 can be increased. As a result, the visual confirmation of the identification portion 31 can be further improved.

[0059] The plurality of identification parts 31 may have the same shape and size. In addition, the plurality of identification parts 31 may be different from each other in at least one of shape and size. For example, when viewed from the outside in the radial direction, the plurality of identification parts 31 may have different shapes.

[0060] The front axle 20 may have a latching portion 67. The latching portion 67 is a portion for latching the latching portion 18 of the cap 14 described later when the cap 14 is mounted on the front axle 20. The latching portion 67 may be arranged in front of the flange portion 21. The latching portion 67 may be, for example, a convex portion or a concave portion formed on the outer peripheral surface of the front axle 20. In the present embodiment, the latching portion 67 is an annular convex portion formed on the outer peripheral surface of the front axle 20 and extending in the circumferential direction.

[0061] The maximum width dimension W of the cutout portion 43 (see Figure 7 ) For example, it can be 30% or more and 50% or less of the outer diameter D of the front end 41 of the rear axle 40. By making the maximum width dimension W 30% or more of the outer diameter D, the visual confirmation of the identification portion 31 can be fully ensured. In addition, by making the maximum width dimension W 50% or less of the outer diameter D, the strength of the front portion of the rear axle 40 can be fully ensured. Preferably, the maximum width dimension W can be 35% or more and 48% or less of the outer diameter D.

[0062] The length L of the axial direction da of the cutout portion 43 may be 50% or more and 150% or less of the outer diameter D of the front end 41 of the rear axle 40. By setting the length L of the cutout portion 43 to be 50% or more of the outer diameter D, the visual confirmation of the identification portion 31 can be sufficiently ensured. In addition, by setting the length L of the cutout portion 43 to be 150% or less of the outer diameter D, the strength of the front portion of the rear axle 40 can be sufficiently ensured. Preferably, the length L of the cutout portion 43 may be 80% or more and 120% or less of the outer diameter D.

[0063] Figure 8 FIG. 2 is a diagram showing the front axle 20 and the rear axle 40 in a state of being assembled with each other. Figure 8 In the figure, the front axle 20 is shown in an appearance diagram, and the rear axle 40 is shown in a cross-sectional view. The front axle 20 may have a rear axle side sealing portion 61 and a locking portion 65. The rear axle side sealing portion 61 has the function of sealing a gap that may be formed between the front axle 20 and the rear axle 40. The rear axle side sealing portion 61 is arranged behind the identification portion 31. Figure 5 , Figure 6 as well as Figure 8 In the example shown, the rear axle side sealing portion 61 includes a first annular protrusion 63 formed on the outer surface of the front axle 20. By the first annular protrusion 63 being in close contact with the inner surface of the rear axle 40, the gap that may be formed between the front axle 20 and the rear axle 40 can be sealed. As a result, it is possible to suppress the ink or the solvent component evaporated from the ink from leaking through the gap that may be formed between the front axle 20 and the rear axle 40. In addition, the rear axle side sealing portion 61 may also include an annular protrusion formed on the inner surface of the rear axle 40 instead of the first annular protrusion 63 formed on the outer surface of the front axle 20. In this case, by making the annular protrusion formed on the inner surface of the rear axle 40 in close contact with the outer surface of the front axle 20, the gap that may be formed between the front axle 20 and the rear axle 40 can be sealed. In addition, the rear axle side sealing portion 61 may also include the first annular protrusion 63 formed on the outer surface of the front axle 20 and the annular protrusion formed on the inner surface of the rear axle 40.

[0064] The locking portion 65 is a portion that is locked with the locked portion 47 of the rear axle 40 when the front axle 20 is installed on the rear axle 40. The locking portion 65 can be, for example, a convex portion or a concave portion formed on the outer peripheral surface of the front axle 20. In the present embodiment, the locking portion 65 is an annular convex portion formed on the outer peripheral surface of the front axle 20 and extending in the circumferential direction. When the front axle 20 is installed on the rear axle 40, the locking portion 65 passes over the locked portion 47 and is locked to the locked portion 47. Thus, the front axle 20 is prevented from slipping out of the rear axle 40 to the front. In addition, the locking portion 65 is not limited to an annular convex portion, and can be, for example, an annular concave portion formed on the outer peripheral surface of the front axle 20 and extending in the circumferential direction. In this case, the locking portion 65 is locked to the locked portion 47 by embedding the convex portion of the locked portion 47 into the concave portion of the locking portion 65. In addition, the locked portion 47 of the rear axle 40 may be, for example, an annular recessed portion formed on the inner circumferential surface of the rear axle 40 and extending in the circumferential direction. In this case, the locking portion 65 is locked to the locked portion 47 by fitting the protruding portion of the locking portion 65 into the recessed portion of the locked portion 47. The locking portion 65 may be located behind the identification portion 31. In addition, the locking portion 65 may be located in front of the rear axle-side sealing portion 61. The locking portion 65 may be located between the identification portion 31 and the rear axle-side sealing portion 61.

[0065] Fig. 9 It is a longitudinal sectional view showing the cap portion 14 . Fig.10 FIG. 2 is a diagram showing the front axle 20 and the cap portion 14 in a state of being assembled with each other. Fig.10 In the figure, the cap 14 is shown in a cross-sectional view, and the front axle 20 is shown in an appearance view. A cap side sealing portion 16 is arranged between the cap 14 and the front axle 20. The cap side sealing portion 16 has the function of sealing a gap that may be formed between the cap 14 and the front axle 20. The cap side sealing portion 16 is arranged in front of the flange portion 21. Fig. 9 and Fig.10 In the example shown, the cap-side sealing portion 16 includes a second annular protrusion 17 formed on the inner surface of the cap 14. By the second annular protrusion 17 being in close contact with the outer surface of the front shaft 20, a gap that may be formed between the cap 14 and the front shaft 20 can be sealed. As a result, the solvent component of the ink evaporated from the writing portion 52 of the pen head member 50 can be suppressed from leaking through the gap that may be formed between the cap 14 and the front shaft 20. In addition, the cap-side sealing portion 16 may also include an annular protrusion formed on the outer surface of the front shaft 20 instead of the second annular protrusion 17 formed on the inner surface of the cap 14. In this case, the annular protrusion formed on the outer surface of the front shaft 20 is in close contact with the inner surface of the cap 14, thereby enabling the gap that may be formed between the cap 14 and the front shaft 20 to be sealed. In addition, the cap-side sealing portion 16 may include a second annular protrusion 17 formed on the inner surface of the cap 14 and an annular protrusion formed on the outer surface of the front shaft 20 .

[0066] The cap 14 may have a locking portion 18. The locking portion 18 is a portion that is locked with the locked portion 67 of the front axle 20 when the cap 14 is mounted on the front axle 20. The locking portion 18 may be, for example, a convex portion or a concave portion formed on the inner circumferential surface of the cap 14. In the present embodiment, the locking portion 18 is a convex portion formed on the inner circumferential surface of the cap 14. When the cap 14 is mounted on the front axle 20, the locking portion 18 passes over the locked portion 67 and is locked to the locked portion 67. Thus, the cap 14 is prevented from slipping out forward from the front axle 20. In addition, the locking portion 18 is locked to the locked portion 67 according to the force with which the user pulls the cap 14 forward so that the cap 14 can be removed from the front axle 20. Fig. 9 In the example shown, the locking portion 18 includes a plurality of convex portions. The plurality of convex portions can be arranged at equal angular intervals from each other in the circumferential direction. In the present embodiment, the locking portion 18 has four convex portions. The four convex portions are arranged at an angular interval of 90 degrees from each other. Not limited thereto, the locking portion 18 may also have two, three or more than five convex portions. In addition, the locking portion 18 is not limited to a convex portion, and may be, for example, a concave portion formed on the inner circumferential surface of the cap portion 14. In this case, the locking portion 18 is locked to the locked portion 67 by embedding the convex portion of the locked portion 67 into the concave portion of the locking portion 18. In addition, the locked portion 67 of the front axle 20 may also be, for example, a concave portion formed on the outer circumferential surface of the front axle 20. In this case, the locking portion 18 is locked to the locked portion 67 by embedding the convex portion of the locking portion 18 into the concave portion of the locked portion 67. The locking portion 18 may be located behind the cap side sealing portion 16 (the second annular protrusion 17).

[0067] The writing tool 10 may further include a second nib component 12 and a rear cap 13. The second nib component 12 may be configured to be capable of forming handwriting different from the handwriting formed by the writing portion 52 of the nib component 50. The rear end portion of the second nib component 12 protrudes rearward from the rear end of the rear shaft 40, constituting a writing portion for forming handwriting. The front end of the second nib component 12 is inserted into the ink storage body 11 from the rear of the ink storage body 11. Ink can flow from the ink storage body 11 through the second nib component 12 toward the rear end portion of the second nib component 12. The rear cap 13 is mounted on the rear end portion of the rear shaft 40 in a detachable manner. The rear cap 13 covers the second nib component 12 and suppresses the drying of the ink in the second nib component 12.

[0068] The writing tool 10 of this embodiment comprises: a shaft cylinder 15, which includes a front shaft 20 and a rear shaft 40 installed on the front shaft 20 from the rear, and the front part of the rear shaft 40 has a cylindrical shape; and a pen body 90, which has a writing part 52 for forming handwriting, the rear shaft 40 has a cutout part 43 extending from the front end of the rear shaft 40 to the rear, and the front shaft 20 has an identification part 31 located in the cutout part 43 and capable of identifying the orientation of the pen body 90, the identification part 31 includes a first surface 35 and a second surface 36 located behind the first surface 35, the first surface 35 is a plane parallel to the central axis A of the shaft cylinder 15, and the second surface 36 is a surface that is farther away from the central axis A toward the rear.

[0069] According to such a writing instrument 10, the identification portion 31 and the rear shaft 40 are formed by different parts. Therefore, when the writing instrument 10 is visually confirmed from the outside, the identification portion 31 can be visually confirmed by being distinguished from the rear shaft 40. Thus, even if the identification portion 31 is not colored, the visual confirmation of the identification portion 31 is improved. That is, the visual confirmation of the identification portion 31 can be improved with a simple structure without increasing the manufacturing cost of the writing instrument 10.

[0070] In addition, the identification portion 31 is located in the cutout portion 43 of the rear axle 40, thereby preventing the front axle 20 from rotating in the circumferential direction relative to the rear axle 40 having a cylindrical front portion. Furthermore, by engaging the identification portion 31 with the cutout portion 43, the circumferential directions of the front axle 20 and the rear axle 40 can be easily aligned. In addition, the identification portion 31 including the first surface 35 and the second surface 36 is located in the cutout portion 43 of the rear axle 40, so that the identification portion 31 with a sloped surface can be easily formed on the outer surface of the rear axle 40 having a cylindrical front portion.

[0071] Furthermore, when writing, the user can properly hold the writing instrument 10 by placing a finger on the first surface 35 formed of a plane. In addition, the identification portion 31 and the rear shaft 40 are formed of different components, so that a material suitable for contact with the user's fingers can be used as the material of the identification portion 31. As a material suitable for contact with the user's fingers, a non-slip material can be used.

[0072] Furthermore, when the rear axle 40 is manufactured using a mold, the rear axle 40 can be smoothly removed from the mold without being caught on the mold by simply pulling the formed rear axle 40 in one direction rearward relative to the mold. As a result, no joint (parting line) of the mold is generated on the outer surface of the rear axle 40. Therefore, it is possible to suppress damage to the appearance and touch of the rear axle 40.

[0073] The first surface 35 of the writing instrument 10 of the present embodiment has a rectangular shape, the second surface 36 has a semicircular shape or a semi-elliptical shape, and the cutout portion 43 has a complementary shape to the identification portion 31 .

[0074] According to such writing instrument 10, when front shaft 20 is attached to rear shaft 40, identification portion 31 can be easily inserted into notch 43. In addition, circumferential rotation of front shaft 20 relative to rear shaft 40 having a cylindrical front portion can be more appropriately suppressed.

[0075] The writing instrument 10 of the present embodiment includes two identification portions 31 , and the two identification portions 31 are arranged at an angular interval of 180 degrees in the circumferential direction.

[0076] According to such a writing tool 10, when writing, the writing tool 10 can be held more appropriately by making the fingers contact the two identification parts 31 respectively. In addition, when the user removes the cap 14 from the front shaft 20, the front shaft 20 can be firmly held by placing the fingers on the two second surfaces 36, thereby making it easy to remove the cap 14 from the front shaft 20. Moreover, whether a right-handed user holds the writing tool 10 or a left-handed user holds the writing tool 10, at least one identification part 31 can be visually confirmed. Therefore, the visual confirmation of the identification part 31 is improved.

[0077] In the writing tool 10 of the present embodiment, the writing portion 52 has a ridge portion 53, which is intended to come into contact with the writing surface on which handwriting is formed. When the writing tool 10 is observed from the front, the ridge portion 53 extends in a straight line along the first direction d1, and the two identification portions 31 are respectively arranged on straight lines passing through the central axis A and perpendicular to the central axis A and the first direction d1.

[0078] According to such a writing instrument 10, whether a right-handed user or a left-handed user, by holding the writing instrument 10 in a manner such that any identification portion 31 is located near the front, the writing portion 52 can be directed to an appropriate direction. That is, the identification portion 31 can be provided in a manner preferred by both right-handed users and left-handed users.

[0079] In the writing instrument 10 of the present embodiment, the front shaft 20 has the flange portion 21 that contacts the front end of the rear shaft 40 , and the flange portion 21 extends in the circumferential direction from the front end portion 38 of the identification portion 31 .

[0080] According to such a writing instrument 10, the identification portion 31 can be extended to the region where the flange portion 21 is to be formed. That is, the area of ​​the identification portion 31 can be increased. Thus, the visibility of the identification portion 31 can be further improved.

[0081] In the writing tool 10 of this embodiment, a rear shaft side sealing portion 61 is arranged behind the identification portion 31, and the rear shaft side sealing portion 61 includes a first annular protrusion 63 formed on the outer surface of the front shaft 20, and the first annular protrusion 63 is in close contact with the inner surface of the rear shaft 40.

[0082] According to such a writing instrument 10, it is possible to seal the gap that may be formed between the front shaft 20 and the rear shaft 40. Thus, it is possible to suppress the ink or the solvent component evaporated from the ink from leaking through the gap.

[0083] The writing tool 10 of this embodiment has a locking portion 65 arranged on the outer surface of the front shaft 20 behind the identification portion 31 and a locked portion 47 arranged on the inner surface of the rear shaft 40. When the front shaft 20 is installed on the rear shaft 40, the locking portion 65 is locked to the locked portion 47.

[0084] According to such a writing instrument 10 , it is possible to suppress the front shaft 20 from accidentally coming off from the rear shaft 40 during use of the writing instrument 10 .

[0085] The writing instrument 10 of the present embodiment further includes a cap portion 14 mounted on the front shaft 20 .

[0086] According to such a writing instrument 10, it is possible to suppress drying of the ink in the pen tip member 50 (writing portion 52).

[0087] The writing instrument 10 of this embodiment is provided with a cap-side sealing portion 16 between the cap 14 and the front shaft 20 . The cap-side sealing portion 16 includes a second annular protrusion 17 formed on the inner surface of the cap 14 , and the second annular protrusion 17 is in close contact with the outer surface of the front shaft 20 .

[0088] According to such a writing instrument 10 , it is possible to suppress the solvent component of the ink evaporated from the writing portion 52 of the pen tip member 50 from leaking through the gap that may be formed between the cap portion 14 and the front shaft 20 .

[0089] In the writing instrument 10 of the present embodiment, the maximum width dimension W of the notch portion 43 is not less than 30% and not more than 50% of the outer diameter D of the front end 41 of the rear shaft 40 .

[0090] According to such writing instrument 10, by making the maximum width dimension W 30% or more of the outer diameter D, the visibility of identification portion 31 can be sufficiently ensured. In addition, by making the maximum width dimension W 50% or less of the outer diameter D, the strength of the front portion of rear shaft 40 can be sufficiently ensured.

[0091] In the writing instrument 10 of the present embodiment, the axial length L of the notch 43 is not less than 50% and not more than 150% of the outer diameter D of the front end 41 of the rear shaft 40 .

[0092] According to such a writing instrument 10, by making the length L of the cutout 43 not less than 50% of the outer diameter D, the visual confirmation of the identification portion 31 can be sufficiently ensured. In addition, by making the length L of the cutout 43 not more than 150% of the outer diameter D, the strength of the front portion of the rear shaft 40 can be sufficiently ensured.

[0093] In the writing instrument 10 of the present embodiment, the identification portion 31 has a color different from the color of the outer surface of the rear shaft 40 .

[0094] According to such a writing instrument 10 , the identification portion 31 can be easily distinguished from the rear shaft 40 and visually recognized.

[0095] In the writing instrument 10 of the present embodiment, the identification portion 31 has a color corresponding to the color of the ink stored in the writing instrument 10 .

[0096] According to such writing instrument 10 , the user can easily understand the color of the handwriting formed by writing instrument 10 .

Claims

1. A writing tool comprising: an axle cylinder including a front axle and a rear axle mounted to the front axle from the rear, wherein a front portion of the rear axle has a cylindrical shape; and A pen body having a writing part for forming handwriting, The rear axle has a cutout portion extending rearward from a front end of the rear axle. The front shaft has an identification portion located in the cutout portion and capable of identifying the orientation of the pen body. The identification portion includes a first surface and a second surface located behind the first surface. The first surface is a plane parallel to the central axis of the shaft cylinder. The second surface is a surface that becomes increasingly distant from the central axis as it moves toward the rear.

2. The writing instrument according to claim 1, wherein: The first surface has a rectangular shape, The second surface has a semicircular shape or a semi-elliptical shape, The cutout portion has a complementary shape with respect to the identification portion.

3. The writing instrument according to claim 1, wherein: The writing instrument has two identification parts. The two identification parts are arranged at an angular interval of 180 degrees in the circumferential direction.

4. The writing instrument according to claim 2, wherein: The writing portion has a ridge portion, which is intended to contact the writing surface on which handwriting is formed. When the writing tool is viewed from the front, the ridge portion extends linearly along the first direction. The two identification parts are respectively arranged on straight lines passing through the central axis and perpendicular to the central axis and the first direction.

5. The writing instrument according to claim 1, wherein: The front axle has a flange portion that contacts the front end of the rear axle. The flange portion extends in a circumferential direction from a front end portion of the identification portion.

6. The writing instrument according to claim 1, wherein: A rear axle side sealing portion is arranged behind the identification portion. The rear axle side sealing portion includes a first annular protrusion formed on the outer surface of the front axle, The first annular protrusion is in close contact with the inner surface of the rear axle.

7. The writing instrument according to claim 1, wherein: The writing tool comprises a locking portion disposed on the outer surface of the front shaft behind the identification portion and a locked portion disposed on the inner surface of the rear shaft. When the front axle is mounted on the rear axle, the locking portion is locked to the locked portion.

8. The writing instrument according to claim 1, wherein: The writing instrument also has a cap mounted on the front shaft.

9. The writing instrument according to claim 8, wherein: A cap-side sealing portion is arranged between the cap and the front axle, The cap-side sealing portion includes a second annular protrusion formed on the inner surface of the cap, The second annular protrusion is in close contact with the outer surface of the front shaft.

10. The writing instrument according to claim 1, wherein: The maximum width dimension of the cutout portion is not less than 30% and not more than 50% of the outer diameter of the front end of the rear axle.

11. The writing instrument according to claim 1, wherein: The length of the cutout portion in the axial direction is not less than 50% and not more than 150% of the outer diameter of the front end of the rear axle.

12. The writing instrument according to claim 1, wherein: The identification portion has a color different from a color of an outer surface of the rear axle.

13. The writing instrument according to claim 1, wherein: The identification portion has a color corresponding to the color of ink stored in the writing instrument.

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