Writing instrument

Abstract

To improve visibility of an identification unit with a simple configuration.SOLUTION: A writing instrument 10 comprises a front shaft 20 and a rear shaft 40 attached to the front shaft 20 from behind. A front portion of the rear shaft 40 comprises a barrel 15 having a cylindrical shape, and a pen body 90 having a writing unit 52 that forms a handwriting. The rear shaft 40 has a notch 43 extending rearward from a front end of the rear shaft 40. The front shaft 20 has an identification unit 31 that is located within the notch 43 and that is capable of identifying an orientation of the pen body 90. The identification unit 31 comprises a first surface 35 and a second surface 36 that is located behind the first surface 35. The first surface 35 is a plane parallel to a central axis line A of the barrel 15, and the second surface 36 is a plane that is further away from the central axis line A as it moves rearward.SELECTED DRAWING: Figure 1

Description

[Technical field]

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

[0002] Conventionally, there is known a writing instrument in which writing is performed by contacting a pen tip facing a predetermined direction with a writing surface such as a paper surface. Examples of such writing instruments include a marking pen and a fountain pen. Patent Document 1 describes a writing instrument having a direction identification unit. When writing with this writing instrument, the user holds the writing instrument so that the direction identification unit is located at the top, and the direction of the pen tip becomes a direction suitable for writing. This has the advantage that there is no need to visually check the direction of the pen tip when writing, and writing can be performed immediately after removing the cap to expose the pen tip. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2019-155879 A Summary of the Invention [Problem to be solved by the invention]

[0004] In the writing instrument described in Patent Document 1, the direction identification part (identification part) is formed integrally with the surrounding member (front shaft), so it is sometimes difficult for the user to visually identify the identification part. Although it is possible to color the identification part to make it easier to see, this increases the number of steps required for coloring, which may increase the manufacturing cost of the writing instrument.

[0005] The present invention has been made in consideration of the above points, and has an object to improve the visibility of an identification portion with a simple configuration. [Means for solving the problem]

[0006] The writing instrument of the present invention comprises: [1] A front axle and a rear axle attached to the front axle from the rear, the front portion of the rear axle having a cylindrical shape; a pen body having a writing portion for forming handwriting; The rear axle has a notch portion extending rearward from a front end of the rear axle, the front shaft has an identification portion located within the notch 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 a central axis of the barrel, The second surface is a surface of the writing implement that moves away from the central axis toward the rear.

[0007] The writing instrument of the present invention comprises: [2] the first surface has a rectangular shape; the second surface has a semicircular or semi-elliptical shape; The writing instrument according to [1], wherein the cutout portion has a complementary shape to the identification portion.

[0008] The writing instrument of the present invention comprises: [3] A sensor device having two of the identification units, The writing instrument according to [1] or [2], wherein the two identification parts are arranged at an angular pitch of 180 degrees in the circumferential direction.

[0009] The writing instrument of the present invention comprises: [4] the writing part has a ridge portion intended to contact a writing surface on which writing is to be formed; the ridge portion extends linearly along a first direction when the writing instrument is viewed from the front, [2] The writing instrument described in the above, wherein the two identification parts are each arranged on a straight line that passes through the central axis and is perpendicular to the central axis and the first direction.

[0010] The writing instrument of the present invention comprises: [5] The front axle has a flange portion that contacts a front end of the rear axle, The writing instrument according to any one of [1] to [4], wherein the flange portion extends in a circumferential direction from a front end portion of the identification portion.

[0011] The writing instrument of the present invention comprises: [6] A rear axle side sealing portion is disposed behind the identification portion, The rear axle sealing portion includes a first annular protrusion formed on an outer surface of the front axle, The writing instrument according to any one of [1] to [5], wherein the first annular protrusion is in intimate contact with the inner surface of the rear barrel.

[0012] The writing instrument of the present invention comprises: [7] A locking portion is provided on an outer surface of the front axle behind the identification portion, and a locked portion is provided on an inner surface of the rear axle, The writing instrument according to any one of [1] to [6], wherein the locking portion locks onto the locked portion when the front shaft is attached to the rear shaft.

[0013] The writing instrument of the present invention comprises: [8] The writing instrument described in any one of [1] to [7], further comprising a cap attached to the front shaft.

[0014] The writing instrument of the present invention comprises: [9] A cap-side sealing portion is disposed between the cap and the front shaft; the cap sealing portion includes a second annular projection formed on an inner surface of the cap; [8] The writing instrument described in [8], wherein the second annular protrusion is in close contact with the outer surface of the front barrel.

[0015] The writing instrument of the present invention comprises:

[10] The writing instrument according to any one of [1] to [9], wherein the maximum width dimension of the cutout portion is 30% to 50% of the outer diameter of the front end of the rear barrel.

[0016] The writing instrument of the present invention comprises:

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

[10] , wherein the axial length of the cutout portion is 50% to 150% of the outer diameter of the front end of the rear barrel.

[0017] The writing instrument of the present invention comprises:

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

[11] , wherein the distinguishing portion has a color different from the color of the outer surface of the rear barrel.

[0018] The writing instrument of the present invention comprises:

[13] The writing instrument 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 instrument. Effect of the Invention

[0019] According to the present invention, it is possible to improve the visibility of the identification portion with a simple configuration. [Brief description of the drawings]

[0020] [Figure 1] FIG. 1 is a diagram showing one embodiment of the present invention, and is a perspective view showing the appearance of an example of a writing instrument. [Diagram 2] FIG. 2 is an external view showing the writing instrument with the cap removed. [Diagram 3] FIG. 3 is a vertical cross-sectional view of the writing instrument of FIG. [Figure 4] FIG. 4 is a front view of the writing instrument of FIG. [Diagram 5] FIG. 5 is a perspective view showing the front and rear barrels of the writing instrument. [Figure 6] FIG. 6 is an external view showing the front axle. [Figure 7] FIG. 7 is a vertical cross-sectional view showing the rear axle. [Figure 8] FIG. 8 shows the front and rear axles assembled together. [Figure 9] FIG. 9 is a vertical cross-sectional view showing the cap. [Figure 10] FIG. 10 shows the front shaft and the cap in an assembled state. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0021] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. In the drawings attached to this specification, the scale and the aspect ratio are appropriately changed and exaggerated from those of the actual objects for the convenience of illustration and understanding.

[0022] In addition, terms used in this specification that specify shapes, geometric conditions, and the extent thereof, such as "parallel," "orthogonal," and "same," as well as values ​​of length and angle, are not to be bound by strict meanings, but are to be interpreted to include a range within which similar functions can be expected.

[0023] In this specification, the direction in which the central axis A of the writing instrument 10 extends (longitudinal direction, vertical direction in the vertical cross section) is referred to as the axial direction da, the direction perpendicular to the axial direction da is referred to as the radial direction, and the direction along the circumference around the central axis A is referred to as the circumferential direction. In addition, along the axial direction da, the side approaching a writing surface such as a paper surface when writing (upper side in the vertical cross section) is referred to as the front, and the side moving away from the writing surface (lower side in the vertical cross section) is referred to as the rear. In addition, along the radial direction, the side approaching the central axis A is referred to as the inner side or inward side, and the side moving away from the central axis A is referred to as the outer side or outward side.

[0024] Fig. 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. Fig. 2 is an external view showing the writing instrument 10 with a cap 14 removed. Fig. 3 is a vertical cross-sectional view of the writing instrument 10. Fig. 4 is a diagram showing the writing instrument 10 as viewed from the front.

[0025] The writing instrument 10 of this embodiment is a writing instrument in which writing is performed by contacting a pen tip facing in a predetermined direction with a writing surface such as a paper surface. The writing instrument 10 may be, for example, a marking pen (marker), a fountain pen, or other writing instrument. In this embodiment, an example in which the writing instrument 10 is a marking pen will be described. The writing instrument 10 includes an ink reservoir 11, a barrel 15, and a pen body 90. The barrel 15 includes a front barrel 20 and a rear barrel 40 attached to the rear end of the front barrel 20.

[0026] The ink reservoir 11 is a member that stores ink for forming handwriting. The ink reservoir 11 has a substantially cylindrical shape. The ink reservoir 11 is disposed in a barrel 15. 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 member having continuous pores that can be impregnated with ink and store it. Such an ink reservoir 11 may be, for example, a heat-sealed fiber bundle, a resin-processed fiber bundle, a resin-processed felt, a needle-punched felt, a porous body such as a sponge, or the like. The ink reservoir 11 may also be provided with an outer skin formed of a synthetic resin film or the like on its outer circumferential surface.

[0027] Pen body 90 is a member that forms handwriting on a writing surface such as a paper surface. Pen body 90 of this embodiment includes tip member 50 and holding member 70. It is possible to omit holding member 70. In this case, tip member 50 may be attached directly to barrel tube 15 (front barrel 20).

[0028] The tip member (first tip member) 50 is a member that forms handwriting on a writing surface such as a paper surface. The tip member 50 is made of a material through which ink can flow in the axial direction da. For example, the tip member 50 may be made of a porous body having open cells. Alternatively, the tip member 50 may be made of a fiber bundle, a bristle bundle, felt, a resin having capillary passages extending in the axial direction da, or the like.

[0029] The tip member 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 a writing surface. At least a portion of the front of the writing portion 52 protrudes forward from the holding member 70. The writing portion 52 may have, for example, a chisel shape. However, the writing portion 52 may have other shapes such as a bullet shape, a rectangular shape, a square prism shape, a plate shape, etc. The writing portion 52 may have flexibility that allows it to bend and deform in a direction perpendicular to the longitudinal direction in a cross section (horizontal direction, left and right direction in FIG. 4) due to writing pressure.

[0030] The intermediate portion 54 is located behind the writing portion 52 and has a generally cylindrical shape. At least a portion of the intermediate portion 54 is held by the inner surface of the holding member 70. For example, at least a portion of the intermediate 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 intermediate portion 54. The rear end portion 56 has a shape in which the cross-sectional area decreases toward the rear. The rear end portion 56 may have a shape such as a cone shape, a pyramid shape, a truncated cone shape, or a truncated pyramid shape. In this embodiment, the rear end portion 56 has a truncated cone shape in which the cross-sectional area decreases toward the rear. The rear end portion 56 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 56 and the intermediate portion 54 toward the writing portion 52.

[0031] As shown in Figs. 2 to 4, the writing part 52 may have a ridge line portion 53. The ridge line portion 53 is a portion constituting the tip of the writing part 52, and is intended to come into contact with a writing surface on which handwriting is to be formed, such as a paper surface. The ridge line portion 53 extends linearly in a direction that coincides with the longitudinal direction of the writing part 52 when the writing instrument 10 is viewed from the front. The direction that coincides with the longitudinal direction of the writing part 52 when the writing instrument 10 is viewed from the front is defined as a first direction d1. In this case, the ridge line portion 53 extends linearly along the first direction d1 when the writing instrument 10 is viewed from the front. Note that, when the writing instrument 10 is viewed from the side as shown in Figs. 2 and 3, the ridge line portion 53 may extend in a direction perpendicular to the central axis A, or may extend in a direction inclined with respect to the central axis A. In the example shown in Figs. 2 and 3, the ridge line portion 53 extends in a direction inclined with respect to the central axis A.

[0032] The retaining member 70 is a member that retains the tip member 50. The retaining member 70 is attached to the front end of the barrel 15. In particular, in the example shown in Figs. 1 and 2, the retaining member 70 is attached to the front end of the front barrel 20. The retaining member 70 has a generally cylindrical shape. The central axis of the retaining member 70 coincides with the central axis A of the writing instrument 10. The retaining member 70 is formed, for example, by injection molding of a synthetic resin.

[0033] The holding member 70 may have a locking portion that locks to a locked portion provided on the front shaft 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. The locked portion may also be an annular convex portion formed on the inner peripheral surface of the front shaft and extending in the circumferential direction. In this case, when the holding member is attached to the front shaft, the locking portion overcomes the locked portion and is locked to the locked portion. This prevents the holding member from slipping out forward from the front shaft. Note that the locking portion is not limited to an annular convex portion, and may be, for example, 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 fitting the convex portion of the locked portion into the concave portion of the locking portion. In addition, the locked portion of the front shaft may be, for example, an annular concave portion formed on the inner peripheral surface of the front shaft and extending in the circumferential direction. In this case, the protrusion of the locking portion fits into the recess of the locked portion, whereby the locking portion is locked to the locked portion.

[0034] The retaining member 70 may include a flange portion 75 and a support portion 78. The flange portion 75 is formed on the outer circumferential surface of the retaining member 70. When the retaining member 70 is attached to the front axle 20, the flange portion 75 may come into contact with the front end of the front axle 20.

[0035] The support portion 78 is formed to protrude forward from the main body portion of the holding member 70. In this embodiment, the holding member 70 has two support portions 78, and the writing portion 52 of the tip member 50 is disposed between the two support portions 78. The support portion 78 is intended to come into contact with a writing surface such as a paper surface when writing with the writing instrument 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 this embodiment, the writing portion 52 has flexibility that allows it to bend and deform in a direction perpendicular to the longitudinal direction in the cross section (lateral direction, left and right direction in FIG. 4) due to writing pressure. When writing, the support portion 78 comes into contact with the writing surface, so that the amount of bending of the writing portion 52 can be controlled within a predetermined range. This makes it possible to prevent the writing portion 52 from being damaged or broken due to an increase in the amount of bending of the writing portion 52. Furthermore, by moving the writing implement 10 while the two support parts 78 are in contact with the writing surface, the writing part 52 can bend to a certain degree to write a handwritten mark. This makes it possible to write a stable handwritten mark.

[0036] 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 barrel 20 and a rear barrel 40 attached to the rear end of the front barrel 20.

[0037] The front shaft 20 is a member that forms the front part of the writing instrument 10. The front shaft 20 has a substantially cylindrical shape. The central axis of the front shaft 20 coincides with the central axis A of the writing instrument 10. The rear shaft 40 is a member that forms the rear part of the writing instrument 10. The rear shaft 40 has a substantially cylindrical shape. The central axis of the rear shaft 40 coincides with the central axis A of the writing instrument 10. In this embodiment, the rear shaft 40 is intended to be held by the fingers of a user when writing with the writing instrument 10. The rear shaft 40 may include an inner shaft and a grip portion disposed on the outside of the inner shaft. The grip portion is a portion that is held by the fingers of a user when writing with the writing instrument 10. However, this is not limited to this, and the writing instrument 10 may be configured so that the user holds the front shaft 20 to write. In this embodiment, the rear end of the front shaft 20 is inserted into the front end of the rear shaft 40, thereby attaching the front shaft 20 to the rear shaft 40. For example, the front axle 20 may be attached to the rear axle 40 by press-fitting the rear end of the front axle 20 into the front end of the rear axle 40. Also, the front axle 20 may be attached to the rear axle 40 by a front axle-side convex portion formed on the outer circumferential surface of the rear end of the front axle 20 climbing over a rear axle-side convex portion formed on the inner circumferential surface of the front end of the rear axle 40 and being engaged with said rear axle-side convex portion.

[0038] A front cap (cap) 14 may be attached to the front barrel 20. The cap 14 is removably attached to a front portion of the front barrel 20. The cap 14 covers the tip member 50 to prevent the ink on the tip member 50 from drying.

[0039] FIG. 5 is a perspective view showing the front axle 20 and the rear axle 40, FIG. 6 is an external view showing the front axle 20, and FIG.

[0040] The front portion of rear barrel 40 has a cylindrical shape. In this case, when writing portion 52 of tip member 50 cannot be seen from the outside, such as when cap 14 is attached to barrel tube 15 or when tip member 50 is immersed in barrel tube 15, it is difficult for the user to grasp the orientation of writing portion 52. Therefore, in this embodiment, in writing instrument 10 equipped with rear barrel 40 having a cylindrical front portion, identification portion 31 is provided so that the orientation of writing portion 52 of tip member 50 can be easily grasped even when writing portion 52 of tip member 50 cannot be seen from the outside. This identification portion 31 will be described below.

[0041] The rear axle 40 has a notch 43 extending rearward from a front end 41 of the rear axle 40. It is intended that the identification portion 31 is located within the notch 43. The notch 43 has a substantially U-shape when viewed from the radial direction. Specifically, the notch 43 has a contour including a pair of straight portions 44 extending in the axial direction da and a curved portion 45 that connects the rear ends of the pair of straight portions 44 and bulges rearward when viewed from the radial direction. The curved portion 45 may be a part of a circle (arc) or a part of an ellipse.

[0042] The rear axle 40 may have an interlocking portion 47. The interlocking portion 47 is a portion to which an interlocking portion 65 of the front axle 20, described later, interlocks when the front axle 20 is attached to the rear axle 40. The interlocking 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 this embodiment, the interlocking portion 47 is an annular interlocking portion formed on the inner circumferential surface of the rear axle 40 and extending in the circumferential direction.

[0043] A protrusion 30 is formed on the outer peripheral surface of front barrel 20. The outer peripheral edge of protrusion 30 faces the inner peripheral edge of cutout 43 and is close to the inner peripheral edge of cutout 43. The surface of protrusion 30 facing radially outward constitutes identification section 31 that makes it possible to identify the orientation of pen body 90. Protrusion 30 is located within cutout 43 of rear barrel 40. Therefore, identification section 31 is also located within cutout 43 of rear barrel 40 when viewed from the radial direction. Identification section 31 is configured to be visible from the outside, and functions as an indicator that indicates the orientation of pen body 90 (writing part 52).

[0044] The identification portion 31 has a contour having a complementary shape to the contour of the cutout portion 43 of the rear axle 40 when viewed from the radial direction. In other words, the cutout portion 43 has a contour having a complementary shape to the contour of the identification portion 31 when viewed from the radial direction. In the example shown in Figs. 1 and 2, the identification portion 31 has a substantially U-shape when viewed from the radial direction. Specifically, the identification portion 31 has a contour including a pair of straight portions 32 extending in the axial direction da and a curved portion 33 that connects the rear ends of the pair of straight portions 32 and bulges rearward when viewed from the radial direction. The curved portion 33 may be a part of a circle (arc) or a part of an ellipse.

[0045] The rear barrel 40 is disposed around most of the periphery of the distinguishable portion 31. Therefore, when the writing instrument 10 is viewed from the outside, the distinguishable portion 31 is distinguished from the rear barrel 40. This improves the visibility of the distinguishable portion 31 without the need to color the distinguishable portion 31. In other words, it is possible to improve the visibility of the distinguishable portion 31 with a simple configuration without increasing the manufacturing cost of the writing instrument 10.

[0046] Identification portion 31 may have a color different from the color of the outer surface of rear barrel 40. This makes it even easier to visually distinguish identification portion 31 from rear barrel 40. Identification portion 31 may have a color corresponding to the color of the ink contained in writing instrument 10 (ink reservoir 11). In this case, it becomes easier for the user to understand the color of the handwriting formed by writing instrument 10. A color corresponding to the color of the ink contained in writing instrument 10 includes not only a color that is the same as the color of the ink, but also a color similar to the color of the ink.

[0047] The front axle 20 may be formed of a material different from that of the rear axle 40. The identification portion 31 will have an appearance different from that of the rear axle 40. This makes it even easier to visually distinguish the identification portion 31 from the rear axle 40.

[0048] The front shaft 20 may include a plurality of distinguishing portions 31. In particular, the front shaft 20 may include two distinguishing portions 31. The two distinguishing portions 31 may be arranged at an angular pitch of 180 degrees in the circumferential direction. As described above, the ridge portion 53 of the tip member 50 extends along the first direction d1. In this embodiment, as shown in FIG. 4, when the writing instrument 10 is viewed from the front, the two distinguishing portions 31 are each disposed on a straight line L perpendicular to the first direction (longitudinal direction of the writing portion 52) d1. In other words, the two distinguishing portions 31 are each disposed on a straight line L passing through the central axis A and perpendicular to the central axis A and the first direction (longitudinal direction of the writing portion 52) d1. In particular, the circumferential center of each distinguishing portion 31 is located on the straight line L.

[0049] The identification portion 31 includes a first surface 35 and a second surface 36. The second surface 36 is located behind 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 moves away from the central axis A as it moves rearward. The second surface 36 may be a plane or a curved surface. For example, the second surface 36 may be a concave curved surface that bulges toward the central axis A and rearward. The first surface 35 has a rectangular shape when viewed from the radial direction. Also, the second surface 36 has a semicircular or semielliptical shape when viewed from the radial direction. When the identification portion 31 has the second surface 36, when a user removes the cap 14 from the front shaft 20, the second surface 36 functions as a slip prevention by hooking a finger on the second surface 36. Therefore, the user can easily remove the cap 14 from the front shaft 20.

[0050] A flange portion 21 is formed on the outer circumferential surface of the front axle 20. When the front axle 20 is attached to the rear axle 40, the flange portion 21 may contact the front end of the rear axle 40. The flange portion 21 may extend in the circumferential direction 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 is to be formed. In other words, the area of ​​the identification portion 31 can be increased. This can further improve the visibility of the identification portion 31.

[0051] The multiple identification parts 31 may have the same shape and dimensions. The multiple identification parts 31 may differ from each other in at least one of the shape and the size. For example, the multiple identification parts 31 may have different shapes from each other when viewed from the outside in the radial direction.

[0052] Front axle 20 may have a locked portion 67. Locked portion 67 is a portion at which locking portion 18 of cap 14, described later, locks when cap 14 is attached to front axle 20. Locked portion 67 may be located in front of flange 21. Locked portion 67 may be, for example, a convex or concave portion formed on the outer circumferential surface of front axle 20. In the present embodiment, locked portion 67 is an annular protrusion formed on the outer circumferential surface of front axle 20 and extending in the circumferential direction.

[0053] The maximum width dimension W of the cutout portion 43 (see FIG. 7) may be, for example, 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, it is possible to ensure sufficient visibility of the identification portion 31. Furthermore, by making the maximum width dimension W 50% or less of the outer diameter D, it is possible to ensure sufficient strength of the front portion of the rear axle 40. Preferably, the maximum width dimension W may be 35% or more and 48% or less of the outer diameter D.

[0054] The length L of the cutout portion 43 in the axial direction da 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 making the length L of the cutout portion 43 50% or more of the outer diameter D, the visibility of the identification portion 31 can be sufficiently ensured. Furthermore, by making the length L of the cutout portion 43 150% 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.

[0055] FIG. 8 is a diagram showing the front axle 20 and the rear axle 40 in a state where they are assembled together. In FIG. 8, the front axle 20 is shown in an external view, and the rear axle 40 is shown in a cross-sectional view. The front axle 20 may include a rear axle-side sealing portion 61 and a locking portion 65. The rear axle-side sealing portion 61 has a 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 disposed behind the identification portion 31. In the example shown in FIGS. 5, 6, and 8, the rear axle-side sealing portion 61 includes a first annular protrusion 63 formed on the outer surface of the front axle 20. This first annular protrusion 63 is in close contact with the inner surface of the rear axle 40, thereby sealing a gap that may be formed between the front axle 20 and the rear axle 40. This makes it possible to suppress leakage of ink or leakage of solvent components evaporated from the ink through a gap that may be formed between the front axle 20 and the rear axle 40. Note that rear axle-side sealing portion 61 may be equipped with an annular protrusion formed on the inner surface of rear axle 40, instead of first annular protrusion 63 formed on the outer surface of front axle 20. In this case, the annular protrusion formed on the inner surface of rear axle 40 comes into close contact with the outer surface of front axle 20, thereby making it possible to seal any gap that may be formed between front axle 20 and rear axle 40. Also, rear axle-side sealing portion 61 may have first annular protrusion 63 formed on the outer surface of front axle 20, and an annular protrusion formed on the inner surface of rear axle 40.

[0056] The locking portion 65 is a portion that locks to the locked portion 47 of the rear axle 40 when the front axle 20 is attached to the rear axle 40. The locking portion 65 may be, for example, a convex portion or a concave portion formed on the outer circumferential surface of the front axle 20. In this embodiment, the locking portion 65 is an annular convex portion formed on the outer circumferential surface of the front axle 20 and extending in the circumferential direction. When the front axle 20 is attached to the rear axle 40, the locking portion 65 climbs over the locked portion 47 and is locked to the locked portion 47. This prevents the front axle 20 from slipping out forward from the rear axle 40. Note that the locking portion 65 is not limited to an annular convex portion, and may be, for example, an annular concave portion formed on the outer circumferential 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 fitting the convex portion of the locked portion 47 into the concave portion of the locking portion 65. Furthermore, the locked portion 47 of the rear axle 40 may be, for example, an annular recess formed on the inner peripheral surface of the rear axle 40 and extending in the circumferential direction. In this case, the protrusion of the locking portion 65 fits into the recess of the locked portion 47, thereby locking the locking portion 65 to the locked portion 47. The locking portion 65 may be located rearward of the identification portion 31. The locking portion 65 may be located forward 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.

[0057] FIG. 9 is a vertical cross-sectional view of cap 14. FIG. 10 is a view showing front barrel 20 and cap 14 in a state where they are assembled together. FIG. 10 shows cap 14 in a cross-sectional view and front barrel 20 in an external view. Cap side sealing portion 16 is disposed between cap 14 and front barrel 20. Cap side sealing portion 16 has a function of sealing a gap that may be formed between cap 14 and front barrel 20. Cap side sealing portion 16 is disposed in front of flange portion 21. In the example shown in FIG. 9 and FIG. 10, cap side sealing portion 16 includes a second annular protrusion 17 formed on the inner surface of cap 14. This second annular protrusion 17 is in close contact with the outer surface of front barrel 20, thereby sealing a gap that may be formed between cap 14 and front barrel 20. This makes it possible to suppress leakage of the solvent component of the ink evaporated from writing portion 52 of tip member 50 through a gap that may be formed between cap 14 and front barrel 20. Note that cap-side sealing portion 16 may include an annular protrusion formed on the outer surface of front shaft 20 instead of second annular protrusion 17 formed on the inner surface of cap 14. In this case, the annular protrusion formed on the outer surface of front shaft 20 comes into close contact with the inner surface of cap 14, thereby sealing off any gap that may be formed between cap 14 and front shaft 20. Cap-side sealing portion 16 may also have second annular protrusion 17 formed on the inner surface of cap 14, and an annular protrusion formed on the outer surface of front shaft 20.

[0058] The cap 14 may have a locking portion 18. The locking portion 18 is a portion that locks to a locked portion 67 of the front shaft 20 when the cap 14 is attached to the front shaft 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 this embodiment, the locking portion 18 is a convex portion formed on the inner circumferential surface of the cap 14. When the cap 14 is attached to the front shaft 20, the locking portion 18 climbs over the locked portion 67 and is locked to the locked portion 67. This prevents the cap 14 from slipping out forward from the front shaft 20. The locking portion 18 is locked to the locked portion 67 with a force that allows the user to remove the cap 14 from the front shaft 20 by pulling the cap 14 forward. In the example shown in FIG. 9, the locking portion 18 includes a plurality of protrusions. The plurality of protrusions may be arranged at equal angular pitches in the circumferential direction. In this embodiment, the locking portion 18 has four protrusions. The four protrusions are arranged at an angle pitch of 90 degrees from each other. The locking portion 18 may have two, three, five or more protrusions. The locking portion 18 is not limited to a protrusion, and may be, for example, a recess formed on the inner peripheral surface of the cap 14. In this case, the protrusion of the locked portion 67 fits into the recess of the locked portion 18, so that the locking portion 18 is locked to the locked portion 67. The locked portion 67 of the front shaft 20 may be, for example, a recess formed on the outer peripheral surface of the front shaft 20. In this case, the protrusion of the locking portion 18 fits into the recess of the locked portion 67, so that the locking portion 18 is locked to the locked portion 67. The locking portion 18 may be located behind the cap side sealing portion 16 (the second annular protrusion 17).

[0059] Writing instrument 10 may further include second tip member 12 and rear cap 13. Second tip member 12 may be configured to be able to form handwriting different from handwriting formed by writing portion 52 of tip member 50. The rear end of second tip member 12 protrudes rearward from the rear end of rear barrel 40 and forms a writing portion that forms handwriting. The front end of second tip member 12 is inserted into ink reservoir 11 from the rear of ink reservoir 11. Ink can flow from ink reservoir 11 through second tip member 12 toward the rear end of second tip member 12. Rear cap 13 is detachably attached to the rear end of rear barrel 40. Rear cap 13 covers second tip member 12 to prevent ink in second tip member 12 from drying.

[0060] Writing instrument 10 of the present embodiment includes a front barrel 20, a rear barrel 40 attached to front barrel 20 from the rear, the front portion of rear barrel 40 having a cylindrical shape, a barrel tube 15, and a pen body 90 having a writing portion 52 for forming handwriting, rear barrel 40 has a notch 43 extending rearward from the front end of rear barrel 40, front barrel 20 has an identification portion 31 located within notch 43 and capable of identifying the orientation of pen body 90, identification portion 31 includes a first surface 35 and a second surface 36 located rearward of first surface 35, first surface 35 is a plane parallel to the central axis A of barrel 15, and second surface 36 is a surface that moves away from the central axis A as it extends rearward.

[0061] According to such a writing instrument 10, the identification portion 31 and the rear barrel 40 are formed from separate members. Therefore, when the writing instrument 10 is viewed from the outside, the identification portion 31 is visible and distinguished from the rear barrel 40. This improves the visibility of the identification portion 31 without the need to color the identification portion 31. In other words, it is possible to improve the visibility of the identification portion 31 with a simple configuration without increasing the manufacturing cost of the writing instrument 10.

[0062] Furthermore, because the identification portion 31 is located within the cutout portion 43 of the rear axle 40, it is possible to prevent the front axle 20 from rotating in the circumferential direction relative to the rear axle 40, the front portion of which is cylindrical. Furthermore, the engagement between the identification portion 31 and the cutout portion 43 makes it possible to easily align the circumferential orientations of the front axle 20 and the rear axle 40. Furthermore, because the identification portion 31, which includes the first surface 35 and the second surface 36, is located in the cutout portion 43 of the rear axle 40, it is possible to easily form the chamfered identification portion 31 on the outer surface of the rear axle 40, the front portion of which is cylindrical.

[0063] Furthermore, when writing, the user can properly grip the writing instrument 10 by placing a finger on the first surface 35, which is configured as a flat surface. Also, since the identification portion 31 and the rear barrel 40 are formed from separate members, a material suitable for contact with the user's finger can be used as the material for the identification portion 31. As a material suitable for contact with the user's finger, a non-slip material or the like can be used.

[0064] Furthermore, when the rear axle 40 is manufactured using a mold, the rear axle 40 can be smoothly removed from the mold without getting caught on it by simply pulling the formed rear axle 40 in one direction toward the rear of the mold. This prevents a parting line of the mold from appearing on the outer surface of the rear axle 40. This prevents damage to the appearance and feel of the rear axle 40.

[0065] In the writing instrument 10 of this embodiment, the first surface 35 has a rectangular shape, the second surface 36 has a semicircular or semi-elliptical shape, and the cutout portion 43 has a shape complementary to the identification portion 31.

[0066] With such a writing instrument 10, when attaching front barrel 20 to rear barrel 40, identification portion 31 can be easily inserted into notch portion 43. Furthermore, it is possible to more appropriately prevent front barrel 20 from rotating in the circumferential direction relative to rear barrel 40, the front portion of which has a cylindrical shape.

[0067] The writing instrument 10 of this embodiment includes two identification portions 31, which are arranged at an angular pitch of 180 degrees in the circumferential direction.

[0068] According to such a writing instrument 10, when writing, the user holds the writing instrument 10 with his / her fingers touching each of the two identification portions 31, thereby allowing the user to hold the writing instrument 10 more appropriately. Furthermore, when the user removes the cap 14 from the front barrel 20, the user can firmly hold the front barrel 20 by placing his / her fingers on the two second surfaces 36, thereby allowing the user to easily remove the cap 14 from the front barrel 20. Furthermore, at least one identification portion 31 can be seen when the writing instrument 10 is held by a right-handed user and when the writing instrument 10 is held by a left-handed user. Therefore, the visibility of the identification portion 31 is improved.

[0069] In the writing instrument 10 of this embodiment, the writing portion 52 has a ridge portion 53 intended to contact the writing surface on which the handwriting is formed, and the ridge portion 53 extends in a straight line along the first direction d1 when the writing instrument 10 is viewed from the front, and the two identification portions 31 are each arranged on a straight line that passes through the central axis A and is perpendicular to the central axis A and the first direction d1.

[0070] With such a writing instrument 10, whether the user is right-handed or left-handed, the user can orient the writing part 52 in an appropriate direction by holding the writing instrument 10 so that one of the identification parts 31 is located in front. In other words, the identification part 31 can be provided in a manner suitable for both right-handed and left-handed users.

[0071] In the writing instrument 10 of this embodiment, the front barrel 20 has a flange 21 that contacts the front end of the rear barrel 40 , and the flange 21 extends in the circumferential direction from the front end 38 of the identification portion 31 .

[0072] According to such a writing instrument 10, it is possible to extend the distinguishable portion 31 to the area where the flange portion 21 is to be formed. In other words, it is possible to increase the area of ​​the distinguishable portion 31. This makes it possible to further improve the visibility of the distinguishable portion 31.

[0073] In the writing instrument 10 of this embodiment, a rear barrel side sealing portion 61 is disposed behind the identification portion 31, and the rear barrel side sealing portion 61 includes a first annular protrusion 63 formed on the outer surface of the front barrel 20, and the first annular protrusion 63 is in close contact with the inner surface of the rear barrel 40.

[0074] According to such a writing instrument 10, it is possible to seal a gap that may be formed between the front barrel 20 and the rear barrel 40. This makes it possible to prevent the ink from leaking out through the gap, or the solvent components that have evaporated from the ink from leaking out.

[0075] The writing instrument 10 of this embodiment comprises a locking portion 65 provided on the outer surface of the front shaft 20 behind the identification portion 31, and an interlocking portion 47 provided on the inner surface of the rear shaft 40, and when the front shaft 20 is attached to the rear shaft 40, the locking portion 65 engages with the interlocking portion 47.

[0076] According to such a writing instrument 10, it is possible to prevent the front barrel 20 from unintentionally coming off the rear barrel 40 while the writing instrument 10 is being used.

[0077] The writing instrument 10 of this embodiment further includes a cap 14 attached to the front barrel 20 .

[0078] According to such a writing instrument 10, it is possible to prevent the ink from drying out in the tip member 50 (writing portion 52).

[0079] In this embodiment of the writing instrument 10, a cap side sealing portion 16 is disposed between the cap 14 and the front shaft 20, and 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.

[0080] According to such a writing instrument 10, it is possible to prevent the solvent components of the evaporated ink from leaking out from the writing portion 52 of the tip member 50 through a gap that may be formed between the cap 14 and the front barrel 20.

[0081] In the writing instrument 10 of this embodiment, the maximum width dimension W of the cutout portion 43 is 30% to 50% of the outer diameter D of the front end 41 of the rear barrel 40.

[0082] With such a writing instrument 10, the maximum width dimension W is 30% or more of the outer diameter D, so that the visibility of the identification portion 31 can be sufficiently ensured. Furthermore, the maximum width dimension W is 50% or less of the outer diameter D, so that the strength of the front portion of the rear barrel 40 can be sufficiently ensured.

[0083] In the writing instrument 10 of this embodiment, the axial length L of the cutout portion 43 is 50% or more and 150% or less of the outer diameter D of the front end 41 of the rear barrel 40.

[0084] In such a writing instrument 10, the length L of the cutout portion 43 is 50% or more of the outer diameter D, thereby ensuring sufficient visibility of the identification portion 31. Furthermore, the length L of the cutout portion 43 is 150% or less of the outer diameter D, thereby ensuring sufficient strength of the front portion of the rear barrel 40.

[0085] In the writing instrument 10 of this embodiment, the identification portion 31 has a color different from the color of the outer surface of the rear barrel 40.

[0086] According to such a writing instrument 10, the identification portion 31 can be easily visually distinguished from the rear barrel 40.

[0087] In the writing instrument 10 of this embodiment, the identification portion 31 has a color that corresponds to the color of the ink contained within the writing instrument 10.

[0088] Such a writing instrument 10 allows the user to easily grasp the color of the handwriting formed by the writing instrument 10. [Explanation of symbols]

[0089] 10 Writing instruments 11 Ink reservoir 12 Second chip member 13 Rear cap 14 Cap 15 Shaft tube 16 Cap side sealing part 17 Second annular protrusion 18 Locking part 20 front axle 21 Flange 23 Groove 25 Shaft cylinder side inclined surface 27 Pressing surface 29 Locked part 30 Convex 31 Identification section 32 Straight section 33 Curved section 35 1st surface 36 Second surface 38 Front end 40 rear axle 41 Front end 43 Notch 44 Straight section 45 Curved section 47 Locked part 50 chip member (first chip member) 52 Writing section 53 Ridge 54 Middle section 56 Rear end 61 Rear shaft side sealing part 63 First annular protrusion 65 Locking part 67 Locked part 70 Retaining member 75 Flange 78 Support part 90 Pen type A Center axis da Axial direction

Claims

1. a front axle and a rear axle attached to the front axle from the rear, the front portion of the rear axle having a cylindrical shape; a pen body having a writing portion for forming handwriting; The rear axle has a notch portion extending rearward from a front end of the rear axle, the front shaft has an identification portion located within the notch 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 a central axis of the barrel, The second surface is a surface that moves away from the central axis as it moves rearward.

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

3. The device includes two of the identification units, The writing implement according to claim 1 , wherein the two identification portions are arranged at an angular pitch of 180 degrees in the circumferential direction.

4. the writing part has a ridge intended to contact a writing surface on which writing is to be made; the ridge portion extends linearly along a first direction when the writing instrument is viewed from the front, The writing instrument according to claim 2 , wherein the two identification portions are each disposed on a straight line that passes through the central axis and is perpendicular to the central axis and the first direction.

5. the front axle has a flange portion that contacts a front end of the rear axle, The writing implement according to claim 1 , wherein the flange portion extends circumferentially from a front end portion of the identification portion.

6. a rear axle side sealing portion is disposed behind the identification portion, the rear axle sealing portion includes a first annular protrusion formed on an outer surface of the front axle, The writing instrument of claim 1 , wherein the first annular projection is in intimate contact with an inner surface of the rear barrel.

7. a locking portion provided on an outer surface of the front axle behind the identification portion, and a locked portion provided on an inner surface of the rear axle, The writing implement according to claim 1 , wherein the locking portion locks onto the locked portion when the front shaft is attached to the rear shaft.

8. The writing instrument of claim 1 , further comprising a cap attached to the front barrel.

9. a cap-side sealing portion is disposed between the cap and the front shaft; the cap sealing portion includes a second annular projection formed on an inner surface of the cap; The writing instrument of claim 8 , wherein the second annular projection is in intimate contact with an outer surface of the front barrel.

10. 2. The writing implement according to claim 1, wherein the maximum width dimension of the cutout portion is 30% to 50% of the outer diameter of the front end of the rear barrel.

11. The writing implement according to claim 1 , wherein the axial length of the cutout portion is equal to or greater than 50% and equal to or less than 150% of the outer diameter of the front end of the rear barrel.

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 barrel.

13. The writing instrument of claim 1 , wherein the identification portion has a color corresponding to a color of ink contained within the writing instrument.

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