JP7186533B2 - writing instrument - Google Patents

Description

The present invention relates to writing instruments. More specifically, it relates to a writing instrument (marking pen, etc.) having a pen tip and an ink absorbing body.

2. Description of the Related Art Conventionally, products having various types of structures have been developed and sold as writing instruments having a pen tip and an ink occluding body.

In a typical configuration, the nib has sufficient rigidity that forces applied by the user during writing do not cause substantial deformation of the nib. Such "hard" nibs are a staple configuration because they give the user a solid writing feel.

On the other hand, there are also users who desire a soft writing feel like that of a brush. In order to meet such needs, various types of structures have been developed in which the pen tip is deformed (flexed) by the force applied by the user during writing.

For example, Patent Literature 1 discloses a ballpoint pen in which a relay core and a ballpoint pen tip are elastically deformed according to writing pressure. A rectangular window hole is formed in the ball-point pen tip to which the relay core is attached, leaving a longitudinal rib, so that the ball-point pen tip (vertical rib) is easily deformed.

Further, Patent Document 2 discloses a pen tip for a writing brush, which is composed of a flexible porous liquid supply body in which synthetic fibers are bound with a synthetic resin elastomer and has an appropriate number of annular grooves. According to the pen tip for a writing brush, the portion having the annular groove acts as a cushion, and it is possible to freely write from a thin line to a thick line according to the strength of the writing pressure.

Japanese Utility Model Publication No. 59-16227 JP-A-3-221494

In a configuration in which the pen tip deforms (flexes) due to the force applied by the user during writing, the easiness of deformation (flexibility) of the pen tip mainly depends on the properties of the material of the pen tip.

Therefore, when trying to realize a soft writing feeling, it is necessary to configure the pen tip with a soft (easily flexible) material.

However, materials with soft (flexible) characteristics tend to have a weak shape-retaining force, and do not return to their original shape after writing, leading to the problem of prematurely ending the life of the pen tip. rice field.

The present invention has been made in view of the above findings, and the purpose thereof is to provide soft (flexible) characteristics, but at the same time, to prevent it from returning to its original shape after writing. To provide a writing utensil capable of suppressing deformation and realizing a long life.

The present invention provides a pen tip having a front core portion, a central core portion, and a rear core portion, an ink occluding body that contacts the rear core portion of the pen tip and supplies ink to the rear core portion, and the ink. and a pen tip holding tube that holds the central core portion of the pen tip and is held in the main body tube, wherein the front core portion of the pen tip is connected to the pen tip. The rear core portion of the pen tip is also thinner than the central core portion of the pen tip, and the front end of the front core portion of the pen tip is narrower than the lower end in side view. The front core portion of the pen tip has a maximum length of 7 mm or more in a side view, and the pen tip holding cylinder is the front core portion of the pen tip. has a spare cylinder portion extending around the front core portion except for the front end region of the pen, the maximum length of the spare cylinder portion in a side view is 5 mm or more, The writing instrument is characterized in that the distance from the front core portion is 0.03 to 1.0 mm.

According to the present invention, since the front core portion of the pen tip held in the pen tip holding cylinder is thinner than the central core portion of the pen tip, the front core portion of the pen tip is sufficiently flexible with respect to the central core portion of the pen tip. can provide In particular, the front end of the front core of the pen tip has a cut-out blade shape in side view, and the maximum length (length at the top end) of the front core of the pen tip in side view is 7 mm or more. The user can enjoy the feeling of the front core portion of the pen tip bending due to the force applied to the front end of the front core portion of the pen tip as a unique writing feeling.

On the other hand, according to the present invention, except for the front end region of the front core of the pen tip, the spare cylinder part of the pen tip holding cylinder extends around the front core of the pen tip. When an excessive force is applied to the pen tip, the front core portion of the pen tip comes into contact with the spare cylinder portion to suppress further deformation of the front core portion. In particular, the maximum length (the length at the upper end) of the spare cylinder when viewed from the side is 5 mm or more, and the distance between the spare cylinder and the front core of the nib is 0.03 to 1.0 mm. As a result, excessive deformation that makes it difficult for the front core portion of the pen tip to return to its original shape is effectively suppressed, and a long life can be achieved.

In the present invention, the pen tip holding tube holds the front portion of the central core portion of the pen tip, and the body tube holds the rear portion of the central core portion of the pen tip. is preferred.

According to this, the central core portion of the pen tip is held in at least two locations in the axial direction, so that the central core portion of the pen tip can be held more reliably.

Moreover, it is preferable that the central core portion of the pen tip has a cylindrical shape.

According to this, the pen tip can have sufficient strength, and the center core portion of the pen tip can be held more reliably.

Moreover, it is preferable that the pen tip holding cylinder holds the central core portion of the pen tip at a plurality of locations spaced apart in the circumferential direction.

According to this, the central core portion of the pen tip can be held in a well-balanced manner, and more reliable holding of the central core portion of the pen tip can be realized.

Moreover, it is preferable that the distance between the preliminary cylinder portion and the front core portion of the pen tip is substantially constant.

According to this, the effect of suppressing excessive deformation of the front core portion of the pen tip can be effectively provided in all directions by the preliminary cylinder portion. In addition, it is possible to provide an excellent form in terms of design (beauty).

For example, the front core of the nib may be formed in a cylindrical shape except for the front end region. In this case, the preliminary cylinder part can be formed in a corresponding cylindrical shape.

Alternatively, the front core portion of the pen tip may be formed in a substantially polygonal prism shape, for example, a substantially square prism shape, except for the front end region. In this case, the preliminary cylindrical portion may be formed in a corresponding substantially polygonal prism shape, for example, a substantially square cylindrical shape.

Further, the front end of the spare cylinder portion also has a cut-out blade shape in which the upper end is positioned forward of the lower end in a side view, and the front end of the front core portion of the nib and the front end of the spare cylinder portion are aligned. are preferably parallel in side view.

According to this, it is possible to more effectively provide the effect of suppressing excessive deformation of the front core portion of the cutting edge-shaped pen tip in a side view in all directions. In addition, it is possible to provide an excellent form in terms of design (beauty).

Moreover, it is preferable that at least a part of the pen tip holding tube is made of a transparent material or a translucent material.

According to this, it becomes easy to visually recognize the color of ink. In addition, it is possible to provide an excellent form in terms of design (beauty).

Further, it is preferable that a mark indicating the angular position of the pen tip is attached to the body tube and/or the pen tip holding tube.

According to this, the angular position (orientation) of the pen tip can be more easily grasped. The mark is not limited to a visual mark, and may be unevenness that can be discerned by touch.

According to the present invention, since the front core portion of the pen tip held in the pen tip holding cylinder is thinner than the central core portion of the pen tip, the front core portion of the pen tip is sufficiently flexible with respect to the central core portion of the pen tip. can provide In particular, the front end of the front core of the pen tip has a cut-out blade shape in side view, and the maximum length (length at the top end) of the front core of the pen tip in side view is 7 mm or more. The user can enjoy the feeling of the front core portion of the pen tip bending due to the force applied to the front end of the front core portion of the pen tip as a unique writing feeling.

Further, according to the present invention, except for the front end region of the front core portion of the pen tip, the spare cylinder portion of the pen tip holding cylinder extends around the front core portion of the pen tip. When excessive force is applied, the spare cylinder contacts the front core of the nib to suppress further deformation of the front core. In particular, the maximum length (the length at the upper end) of the spare cylinder when viewed from the side is 5 mm or more, and the distance between the spare cylinder and the front core of the nib is 0.03 to 1.0 mm. As a result, excessive deformation that makes it difficult for the front core portion of the pen tip to return to its original shape is effectively suppressed, and a long life can be achieved.

1 is a schematic longitudinal sectional view of a writing instrument according to a first embodiment of the invention; FIG. 2 is a perspective view of the writing instrument of FIG. 1 with the cap removed; FIG. 2 is a perspective view showing the nib of the writing instrument of FIG. 1; FIG. Figure 4 is a side view of the nib of Figure 3; 5 is a cross-sectional view of the nib of FIG. 4 taken along the line AA. FIG. FIG. 5 is a cross-sectional view of the nib of FIG. 4 taken along the line BB. 2 is a perspective view showing a pen tip holding cylinder of the writing instrument of FIG. 1; FIG. FIG. 8 is a cross-sectional perspective view of the pen tip holding cylinder of FIG. 7; FIG. 8 is a plan view of the pen tip holding cylinder of FIG. 7; FIG. 10 is a cross-sectional view of the pen tip holding cylinder of FIG. 9 taken along the line AA; FIG. 2 is a perspective view showing a pen tip and a pen tip holding tube of the writing instrument of FIG. 1; FIG. 12 is a side view showing the pen tip and pen tip holding cylinder of FIG. 11; FIG. 13 is a cross-sectional view of the pen tip and the pen tip holding cylinder taken along line AA of FIG. 12; 13 is a cross-sectional view of the pen tip and the pen tip holding cylinder taken along the line BB in FIG. 12; FIG. FIG. 15 is an enlarged view of the C part of the pen tip and the pen tip holding cylinder of FIG. 14; FIG. 2 is a schematic diagram showing a bent state of the nib of the writing instrument of FIG. 1; It is a schematic vertical cross-sectional view of the writing instrument in 2nd Embodiment of this invention. 18 is a perspective view of the writing instrument of FIG. 17 with the cap removed; FIG. 18 is a perspective view showing the nib of the writing instrument of FIG. 17; FIG. Figure 20 is a side view of the nib of Figure 19; FIG. 21 is a cross-sectional view of the nib of FIG. 20 taken along line AA; FIG. 21 is a cross-sectional view of the nib of FIG. 20 taken along the line BB. 18 is a perspective view showing a pen tip holding cylinder of the writing instrument of FIG. 17; FIG. FIG. 24 is a cross-sectional perspective view of the pen tip holding tube of FIG. 23; FIG. 24 is a plan view of the pen tip holding tube of FIG. 23; FIG. 26 is a cross-sectional view of the pen tip holding cylinder of FIG. 25 taken along the line AA; FIG. 18 is a perspective view showing a pen tip and a pen tip holding tube of the writing instrument of FIG. 17; FIG. 28 is a side view showing the pen tip of FIG. 27 and a pen tip holding tube; FIG. 29 is a cross-sectional view of the pen tip and the pen tip holding barrel of FIG. 28 taken along the line AA; FIG. 29 is a cross-sectional view of the pen tip and pen tip holding cylinder taken along the line BB in FIG. 28; FIG. 31 is an enlarged view of the C part of the pen tip and the pen tip holding cylinder of FIG. 30; FIG. 29 is a view similar to FIG. 28 showing an example in which the tip region of the pen tip holding cylinder is colored;

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described with reference to the drawings.

(Configuration of the first embodiment)
FIG. 1 is a schematic longitudinal sectional view of a writing instrument 1 according to a first embodiment of the invention. FIG. 2 is a perspective view of the writing instrument 1 with the cap 60 removed.

3 is a perspective view showing the pen tip 10 of the writing instrument 1, FIG. 4 is a side view of the pen tip 10, and FIG. 5 is a cross-sectional view of the pen tip 10 taken along line AA in FIG. FIG. 6 is a cross-sectional view of the nib 10 of FIG. 4 taken along line BB.

First, as shown in FIGS. 1 to 6, the writing instrument 1 of this embodiment includes a pen tip 10 having a front core portion 11, a central core portion 12, and a rear core portion 13, and a rear core portion 13 of the pen tip 10. and an ink occluding body 20 for supplying ink to the rear core portion 13 by coming into contact with the rear core portion 13 . The ink occluding body 20 is accommodated by a front cylinder 30 and a rear cylinder 40 that constitute a main body cylinder. A cap 60 is detachable from the front cylinder 30 or the rear cylinder 40 .

As shown in FIGS. 3 to 6, the front core portion 11, the central core portion 12, and the rear core portion 13 of the nib 10 of this embodiment have concentric columnar shapes (in detail, The front core portion 11 is narrower than the center core portion 12 except for the front end region of the front core portion 11 and tapered portions 12t and 13t, which will be described later. Also, the rear core portion 13 is thinner than the central core portion 12 . For example, the front core 11 has a diameter of 4.2 mm, the central core 12 has a diameter of 5.1 mm, and the rear core 13 has a diameter of 3.5 mm.

A gently inclined tapered portion 13t is provided on the rear side of the rear core portion 13 to facilitate insertion into the ink occluding body 20. As shown in FIG. A tapered portion 12 t having a relatively steep slope is provided on the rear side of the central core portion 12 and continues to the rear core portion 13 . For example, the length of the rear core portion 13 (including the tapered portion 13t) is 7.7 mm, and the length of the central core portion 12 (including the tapered portion 12t) is 11.8 mm.

The front end of the front core portion 11 has a cutting blade shape in which the upper end is positioned forward of the lower end in a side view (see FIG. 4), and is provided with an R in the left-right direction (see FIG. 5) and inclined in the vertical direction. (see FIG. 4), and sharp-angled planar portions 11b and 11c provided on both left and right sides of the front end 11a and forming an acute angle (for example, 60 degrees) with each other (see FIG. 5). The line of intersection of the extended planes of the acute angle forming plane portions 11b and 11c is a straight line located further forward of the front end portion 11a and extending in parallel with the front end portion 11a). For example, the upper end length L1 (maximum length) of the front core portion 11 in side view is 13.8 mm, and the lower end length L2 (minimum length) of the front core portion 11 in side view is 12.3 mm. The front end portion 11a and the acute angle forming plane portions 11b and 11c may be formed by cutting, or may be formed by molding in advance.

In addition, as shown in FIGS. 1 and 2, the writing instrument 1 of the present embodiment holds the central core portion 12 of the pen tip 10, while the pen tip holding tube 50 is held by the front tube 30, which is the main body tube. It has

7 is a perspective view showing the pen tip holding tube 50 of the writing instrument 1, FIG. 8 is a sectional perspective view of the pen tip holding tube 50 of FIG. 7, and FIG. 9 is a pen tip holding tube 50 of FIG. 10 is a plan view of the pen tip holding cylinder 50 of FIG. 9 taken along the line AA.

11 is a perspective view showing the pen tip 10 and the pen tip holding tube 50 of the writing instrument 1, FIG. 12 is a side view showing the pen tip 10 and the pen tip holding tube 50, and FIG. 14 is a cross-sectional view of the pen tip 10 and the pen tip holding cylinder 50 taken along the line AA of FIG. 12, and FIG. 15 is an enlarged view of C part of the pen tip 10 and the pen tip holding cylinder 50 of FIG. 14; FIG.

As shown in FIGS. 7 to 15, the pen tip holding tube 50 includes a holding tube portion 52 that holds the central core portion 12 of the pen tip 10, and a front end region (front end portion 11a and front end portion 11a) of the front core portion 11 of the pen tip 10. and a preliminary cylindrical portion 51 extending around the front core portion 11 except for a region including the acute angle forming plane portions 11b and 11c. The holding cylinder portion 52 and the spare cylinder portion 51 have concentric, substantially cylindrical shapes.

For example, the upper end length L3 (maximum length) of the spare cylinder portion 51 in side view is 10 mm, the lower end length L4 (minimum length) in side view of the spare cylinder portion 51 is 8 mm, and the spare cylinder portion 51 (excluding a flange portion 51f described later) is a cylindrical surface with a diameter of 5.4 mm, and the inner surface of the preliminary cylindrical portion 51 is a cylindrical surface with a diameter of 4.6 mm. Therefore, in this embodiment, the distance between the inner peripheral surface of the spare cylinder portion 51 and the outer peripheral surface of the front core portion 11 of the nib 10 (reference numeral G1 in FIG. 15) is constant at 0.2 mm. (As will be described later using FIG. 16, it changes when force is applied to the pen tip 10 during writing). Further, at least one of the inner peripheral surface of the spare cylinder portion 51 and the outer peripheral surface of the front core portion 11 of the nib 10 may be provided with an axial draft angle. This not only improves the productivity of the spare cylinder portion 51 and the nib 10, but also provides the front core portion 11 with sufficient ease of bending.

In addition, the front end of the spare cylinder part 51 also has a cutting blade shape in which the upper end is positioned forward of the lower end in a side view (see FIG. 10). are parallel to each other when viewed from the side (see FIG. 12).

In addition, the holding tube portion 52 has four positions on the inner peripheral surface of the cylindrical surface with a diameter of 5.5 mm so as to hold the front portion of the central core portion 12 of the nib 10 at four positions spaced apart in the circumferential direction. is provided with a holding projection 52p (see FIGS. 8 and 10). Each holding projection 52p has a circumferential width of 0.6 mm and a length of 3.6 mm, for example, and protrudes inward to a position at a radial distance of 2.4 mm from the axis.

In addition, in this embodiment, a flange portion 51f is provided at the rear end portion of the spare cylinder portion 51, and a concave air hole 51r is provided in the flange portion 51f. Via the air hole 51r, the inside of the main tube and the outside of the main tube can be ventilated. As a result, air is drawn into the main cylinder as the ink is consumed, and appropriate ink ejection performance can be maintained. Further, the holding tube portion 52 has a vertical rib 52r projecting radially outward for engagement with the front tube 30, and a slit for improving the assembling efficiency of the pen tip 10 and the pen tip holding tube 50. 52s and are provided. By using the slit 52s, it is possible to position the pen tip 10 and the pen tip holding cylinder 50 in the rotational direction with respect to the axis (to make the front end portion 11a and the front end of the spare cylinder portion 51 parallel when viewed from the side). It can be easily done on board.

As shown in FIG. 1, the front tube 30 holds the pen tip holding tube 50 using the vertical ribs 52r of the pen tip holding tube 50. As shown in FIG. In addition, the length of the holding cylinder portion 52 is shorter than the length of the central core portion 12 (see FIGS. 11 to 13), and the front cylinder 30 has a tapered portion 12t at the rear portion of the central core portion 12 of the nib 10. also holds.

Although the pen tip 10 is made of, for example, a synthetic resin porous material having open cells, it may be any other material as long as it allows ink to flow and has flexibility. , calligraphy nibs, plastic nibs with axial capillary passages, and the like. The easiness of deformation of the front core portion 11 of the pen tip 10 is, for example, a state in which the entire front end portion 11a is in contact with the paper surface and the axis of the front core portion 11 is tilted at 60 degrees with respect to the paper surface (Fig. 16), the displacement of the front end portion 11a against a pressing force of 100 gf (perpendicular to the paper surface) is within the range of 0.40 to 0.48 mm. It is preferable to have In addition, the spare tube portion 51 of the nib holding tube 50 must be less likely to deform than the front core portion 11. When the spare cylinder part 51 is pressed against the paper from a state in which the side surface is in contact with the paper and the side surface is inclined at 60 degrees (a state similar to FIG. 16), the displacement amount ( A direction perpendicular to the plane of the paper) is preferably in the range of 0.02 to 0.04 mm.

In addition, the ink occluding body 20 may be made of a member having continuous pores that can be impregnated with ink. Needle-punched felt bodies, porous bodies (for example, synthetic resin open-cell bodies such as sponges), and the like can be used. In addition, the ink occluding body 20 may be configured to have an outer skin made of a synthetic resin film or the like on its outer peripheral surface.

(Action and effect of the first embodiment)
The writing instrument 1 configured as described above can produce the following effects. That is, according to the writing instrument 1 of the present embodiment, since the front core portion 11 of the pen tip 10 is thinner than the central core portion 12 of the pen tip 10 held in the pen tip holding cylinder 50, the central core portion of the pen tip 10 Sufficient flexibility of the front core portion 11 of the nib 10 relative to 12 can be provided.

The front end of the front core portion 11 of the pen tip 10 is shaped like a cutting blade in side view, and the upper end length L1 (maximum length) of the front core portion 11 of the pen tip 10 in side view is 13.8 mm. In combination with the characteristic that the front core portion 11 of the pen tip 10 is sufficiently long (7 mm or more), the user can feel the bending of the front core portion 11 of the pen tip 10 due to the force applied to the front end of the front core portion 11 of the pen tip 10 . You can enjoy it as a feeling of writing.

On the other hand, according to the writing instrument 1 of the present embodiment, the spare cylinder portion 51 of the pen tip holding cylinder 50 extends around the front core portion 11 of the pen tip 10 except for the front end region of the front core portion 11 . When an excessive force is applied to the front core portion 11 of the pen tip 10, the spare cylinder portion 51 contacts the front core portion 11 of the pen tip 10 to suppress further deformation of the front core portion 11. do. This state is illustrated in FIG. FIG. 16 is a schematic diagram showing a state in which the pen tip 10 of the writing instrument 1 is bent.

Particularly in this embodiment, the upper end length L3 (maximum length) of the spare cylinder portion 51 in a side view is 10 mm, which is sufficiently long (5 mm or more), and the distance between the spare cylinder portion 51 and the front core portion 11 of the nib 10 is 10 mm. In combination with the feature that the gap G1 is constant at 0.2 mm when there is no load (see FIG. 15), excessive deformation that makes it difficult to return to the original shape at the front core portion 11 of the pen tip 10 is effectively suppressed, and a long life can be realized.

Further, according to the writing instrument 1 of the present embodiment, the holding protrusion 52p of the pen tip holding tube 50 holds the front portion of the central core portion 12 of the pen tip 10, and the front tube 30, which is the main body tube, holds the pen tip 10. holding the tapered portion 12t of the central core portion 12 of the . As a result, the center core portion 12 of the pen tip 10 is held at two points in the axial direction, and the center core portion 12 of the pen tip 10 is held more reliably.

Further, according to the writing instrument 1 of the present embodiment, the central core portion 12 of the pen tip 10 has a cylindrical shape. As a result, the pen tip 10 can have sufficient strength, and the central core portion 12 of the pen tip 10 can be held more securely.

Further, according to the writing instrument 1 of the present embodiment, the holding projections 52p of the pen tip holding cylinder 50 hold the central core portion 12 of the pen tip 10 at four locations spaced apart (preferably at regular intervals) in the circumferential direction. is doing. As a result, the center core portion 12 of the pen tip 10 can be held in good balance, and the center core portion 12 of the pen tip 10 can be held more securely.

Further, according to the writing instrument 1 of the present embodiment, the gap G1 between the preliminary cylindrical portion 51 and the front core portion 11 of the pen tip 10 is constant when no force is applied to the pen tip 10 . As a result, the effect of suppressing excessive deformation of the front core portion 11 of the nib 10 can be effectively provided in all directions by the spare cylinder portion 51 . In addition, it is possible to provide an excellent form in terms of design (beauty).

In addition, according to the writing instrument 1 of the present embodiment, the front end of the spare cylinder portion 51 also has a cut-out blade shape in which the upper end is located forward of the lower end in a side view (see FIG. 10), and the front end of the pen tip 10 is formed. The front end of the core portion 11 and the front end of the spare cylinder portion 51 are parallel in a side view (see FIG. 12). As a result, the effect of suppressing excessive deformation of the front core portion 11 of the pen point 10 shaped like a cutting blade can be provided more effectively in all directions. In addition, it is possible to provide an excellent form in terms of design (beauty).

(Configuration of Second Embodiment)
Next, FIG. 17 is a schematic vertical cross-sectional view of a writing instrument 101 according to a second embodiment of the invention. FIG. 18 is a perspective view of the writing instrument 101 with the cap 60 removed.

19 is a perspective view showing the pen tip 110 of the writing instrument 101, FIG. 20 is a side view of the pen tip 110, and FIG. 21 is a cross-sectional view of the pen tip 110 in FIG. 22 is a cross-sectional view of the nib 110 of FIG. 20 taken along line BB.

First, as shown in FIGS. 17 to 22, the writing instrument 101 of this embodiment includes a pen tip 110 having a front core portion 111, a central core portion 112, and a rear core portion 113, and a rear core portion 113 of the nib 110. and an ink occluding body 20 that contacts the rear core portion 113 and supplies ink to the rear core portion 113 . As in the first embodiment, the ink occluding body 20 is accommodated by the front cylinder 30 and the rear cylinder 40 that constitute the main cylinder, and the cap 60 is detachable from the front cylinder 30 or the rear cylinder 40. ing.

As shown in FIGS. 19 to 22, the central core portion 112 and the rear core portion 113 of the nib 110 of this embodiment have concentric columnar shapes (in detail, a tapered portion 112t described later). , 113t), the rear core 113 is narrower than the central core 112 . For example, the diameter of central core 112 is 5.1 mm and the diameter of rear core 113 is 3.5 mm.

Also, as shown in FIGS. 19 to 22, the front core portion 111 of the pen tip 110 of this embodiment has a substantially quadrangular prism shape having a rectangular cross section with rounded corners, except for a front end region which will be described later. (especially see FIG. 22). The axis of the central core portion 112 passes through the center (center of gravity) of the substantially rectangular cross section of the front core portion 111, and the length of the diagonal line of the substantially rectangular cross section (see FIG. 22) is It is smaller than the diameter of the central core portion 112 . That is, the front core portion 111 is thinner than the central core portion 112 . More specifically, the front core portion 111 has a substantially rectangular cross section (see FIG. 22) with a long side length of 4.1 mm and a short side length of 3.2 mm.

Further, as in the first embodiment, the rear core portion 113 is provided with a tapered portion 113t having a gentle slope on the rear side thereof, thereby facilitating insertion into the ink occluding body 20. As shown in FIG. A tapered portion 112 t having a relatively steep slope is provided on the rear side of the central core portion 112 and continues to the rear core portion 113 . For example, the length of the rear core portion 113 (including the tapered portion 113t) is 7.7 mm, and the length of the central core portion 112 (including the tapered portion 112t) is 11.8 mm.

Also, substantially the same as in the first embodiment, the front end of the front core portion 111 has a cut-out blade shape in which the upper end is located forward of the lower end in a side view (see FIG. 20), and R is provided in the left-right direction. (see FIG. 21) and the front end portion 111a inclined in the vertical direction (see FIG. 20), and the acute-angled planar portions 111b provided on both left and right sides of the front end portion 111a and forming an acute angle (for example, 60 degrees) with each other (see FIG. 21). , 111c (the line of intersection of the extended planes of the acute angle forming plane portions 111b and 111c is a straight line located further forward of the front end portion 111a and extending parallel to the front end portion 111a). For example, the upper end length L11 (maximum length) of the front core portion 111 in side view is 13.8 mm, and the lower end length L12 (minimum length) of the front core portion 111 in side view is 12.3 mm. The front end portion 111a and the acute angle forming plane portions 111b and 111c may be formed by cutting, or may be formed by molding in advance.

17 and 18, the writing instrument 101 of the present embodiment holds the central core portion 112 of the nib 110 as well as the front barrel 30, which is the main body barrel. A pen tip holding tube 150 is provided.

23 is a perspective view showing the pen tip holding tube 150 of the writing instrument 101, FIG. 24 is a sectional perspective view of the pen tip holding tube 150 of FIG. 23, and FIG. 25 is a pen tip holding tube 150 of FIG. 26 is a cross-sectional view of the pen tip holding cylinder 150 of FIG. 25 taken along the line AA.

27 is a perspective view showing the pen tip 110 and the pen tip holding tube 150 of the writing instrument 101, FIG. 28 is a side view showing the pen tip 110 and the pen tip holding tube 150, and FIG. 28 is a sectional view of the pen tip 110 and the pen tip holding cylinder 150, FIG. 30 is a sectional view of the pen tip 110 and the pen tip holding cylinder 150 of FIG. 31 is an enlarged view of part C of the pen tip 110 and the pen tip holding tube 150 of FIG. 30; FIG.

As shown in FIGS. 23 to 31, the pen tip holding tube 150 includes a holding tube portion 152 that holds the central core portion 112 of the pen tip 110, and a front end region (front end portion 111a and front end portion 111a) of the front core portion 111 of the pen tip 110. and a preliminary cylindrical portion 151 extending around the front core portion 111 except for the area including the acute angle forming plane portions 111b and 111c. The holding cylinder portion 152 has a substantially cylindrical shape corresponding to the central core portion 112 , and the preliminary cylinder portion 151 has a substantially square cylindrical shape corresponding to the front core portion 111 .

For example, the upper end length L13 (maximum length) of the spare cylinder portion 151 in side view is 10 mm, and the lower end length L14 (minimum length) in side view of the spare cylinder portion 151 is 8.3 mm. A substantially rectangular cross section (see FIG. 30) of the outer peripheral surface of the portion 151 (excluding a flange portion 151f described later) has a long side length of 5.3 mm and a short side length of 4.4 mm. A substantially rectangular cross section (see FIG. 30) of the inner peripheral surface of the preliminary cylindrical portion 151 has a long side length of 4.5 mm and a short side length of 3.6 mm. Therefore, in this embodiment, the distance between the inner peripheral surface of the spare cylinder portion 151 and the outer peripheral surface of the front core portion 111 of the nib 110 (reference numeral G2 in FIG. 31) is constant at 0.2 mm. (Changes when force is applied to the pen tip 10 during writing: see FIG. 16). At least one of the inner peripheral surface of the spare cylinder portion 151 and the outer peripheral surface of the front core portion 111 of the nib 110 may be provided with an axial draft angle. This not only improves the productivity of the spare cylinder portion 151 and the pen tip 110, but also provides the front core portion 111 with sufficient flexibility.

In addition, the front end of the spare cylinder part 151 also has a cutting blade shape in which the upper end is located forward of the lower end in a side view (see FIG. 26). are parallel to each other in a side view (see FIG. 28).

Further, similarly to the first embodiment, the holding cylinder portion 152 is a cylindrical surface with a diameter of 5.5 mm so as to hold the front portion of the central core portion 112 of the nib 110 at four locations spaced apart in the circumferential direction. Four holding protrusions 152p are provided on the inner peripheral surface (see FIGS. 24 and 26). Each holding protrusion 152p has, for example, a circumferential width of 0.6 mm and a length of 3.6 mm, and protrudes inward to a position at a radial distance of 2.4 mm from the axis.

Further, in the present embodiment, a flange portion 151f is provided at the rear end portion of the spare cylinder portion 151, and a concave air hole 151r is provided in the flange portion 151f. Via the air hole 151r, the inside of the body tube and the outside of the body tube can be ventilated. As a result, air is drawn into the main cylinder as the ink is consumed, and appropriate ink ejection performance can be maintained. Further, the holding tube portion 152 has a vertical rib 152r protruding radially outward for engagement with the front tube 30, and a slit for improving the assembling efficiency of the pen tip 110 and the pen tip holding tube 150. 152s and are provided. By using the slit 152s, it is possible to align the pen tip 110 and the pen tip holding cylinder 150 in the rotational direction with respect to the axis (to make the front end 111a and the front end of the spare cylinder part 151 parallel in a side view). It can be easily done on board.

As shown in FIG. 17, the front tube 30 holds the pen tip holding tube 150 using the vertical ribs 152r of the pen tip holding tube 150. As shown in FIG. In addition, the length of the holding tube portion 152 is shorter than the length of the central core portion 112 (see FIGS. 27 to 29), and the front tube 30 has a taper portion 112t at the rear portion of the central core portion 112 of the nib 110. also holds.

It should be noted that the contents described above regarding the material of the pen tip 10 are also applicable to the pen tip 110 .

(Action and effect of the second embodiment)
The writing instrument 101 configured as described above has the following effects. That is, even in the writing instrument 101 of the present embodiment, the front core portion 111 of the pen tip 110 is thinner than the central core portion 112 of the pen tip 110 held in the pen tip holding cylinder 150, so the central core portion 112 of the pen tip 110 It is possible to provide sufficient flexibility of the front core portion 111 of the pen tip 110 for the .

The front end of the front core portion 111 of the pen tip 110 has a cut-out blade shape in a side view, and the upper end length L11 (maximum length) of the front core portion 111 of the pen tip 110 is 13.8 mm, which is sufficient. Combined with the feature of being long (7 mm or more), the user can feel the bending of the front core portion 111 of the pen tip 110 due to the force applied to the front end of the front core portion 111 of the pen tip 110, which gives the user a unique writing feeling. can be enjoyed as

On the other hand, according to the writing instrument 101 of the present embodiment as well, the spare cylinder portion 151 of the pen tip holding cylinder 150 extends around the front core portion 111 except for the front end region of the front core portion 111 of the pen tip 110 . When an excessive force is applied to the front core portion 111 of the nib 110, the spare cylinder portion 151 contacts the front core portion 111 of the nib 110 to suppress further deformation of the front core portion 111. (This is the same as that described with reference to FIG. 16 for the first embodiment).

Especially in the present embodiment, the maximum length (length at the upper end) of the spare cylinder part 151 is 10 mm, which is sufficiently long (5 mm or more), and there is no space between the spare cylinder part 151 and the front core part 111 of the nib 110. Combined with the feature that the interval G2 under load is constant at 0.2 mm (see FIG. 31), excessive deformation that makes it difficult for the front core portion 111 of the nib 110 to return to its original shape is effective. can be suppressed to achieve a long service life.

Also in the writing instrument 101 of this embodiment, the holding projection 152p of the pen tip holding tube 150 holds the front portion of the central core portion 112 of the pen tip 110, and the front tube 30, which is the body tube, holds the pen tip 110. It holds the tapered portion 112t of the central core portion 112 . As a result, the center core portion 112 of the pen tip 110 is held at two points in the axial direction, and the center core portion 112 of the pen tip 110 is held more reliably.

Also in the writing instrument 101 of this embodiment, the central core portion 112 of the pen tip 110 has a cylindrical shape. As a result, the pen tip 110 can have sufficient strength, and the central core portion 112 of the pen tip 110 can be held more reliably.

Also in the writing instrument 101 of the present embodiment, the holding protrusions 152p of the pen tip holding cylinder 150 hold the central core portion 112 of the pen tip 110 at four locations spaced apart (preferably at regular intervals) in the circumferential direction. ing. As a result, the center core portion 112 of the pen tip 110 can be held in good balance, and the center core portion 112 of the pen tip 110 can be held more reliably.

Also, with the writing instrument 101 of the present embodiment, the gap G2 between the spare tube portion 151 and the front core portion 111 of the pen tip 110 is constant when no force is applied to the pen tip 110 . As a result, the effect of suppressing excessive deformation of the front core portion 111 of the nib 110 can be effectively provided in all directions by the spare cylinder portion 151 . In addition, it is possible to provide an excellent form in terms of design (beauty).

Also, in the writing instrument 101 of the present embodiment, the front end of the spare cylinder portion 151 is shaped like a cut-out blade in which the upper end is located forward of the lower end in a side view (see FIG. 26), and the front core of the pen tip 110 is formed. The front end of the portion 111 and the front end of the spare cylinder portion 151 are parallel in side view (see FIG. 28). As a result, the effect of suppressing excessive deformation of the front core portion 111 of the pen tip 110 shaped like a cutting blade can be provided more effectively in all directions. In addition, it is possible to provide an excellent form in terms of design (beauty).

(Color of pen tip holding cylinders 50 and 150)
In each of the above embodiments, the pen tip holding cylinders 50 and 150 are preferably made entirely of a transparent or translucent material. In this case, it becomes easier to visually recognize the color of the ink. In addition, it is possible to provide an excellent form in terms of design (beauty).

Alternatively, it is also useful to use a mode in which only the front end vicinity area of the pen tip holding cylinder 50, 150 is colored and the rest is made of a transparent or translucent material. This aspect has the effect of facilitating grasping of the relative positions of the writing instrument and the writing object when the color of the writing object (for example, paper surface) and the color of the ink are similar. In particular, as shown in FIG. 32, by forming a parallelogram-shaped colored region, it is possible to provide a form excellent in terms of design (beauty).

However, at least at the time of filing the present application, an embodiment in which the entire pen tip holding tube 50, 150 is made of an opaque material is not excluded from the scope of the present invention.

(Angle position mark)
In each of the above-described embodiments, it is preferable that the front barrel 30 and/or the pen tip holding barrels 50 and 150, which are the main barrels, are provided with marks indicating the angular positions of the pen tips 10 and 110. FIG. In this case, the angular positions (orientation of the upper end and lower end) of the pen tips 10, 110 can be grasped more easily. The mark is not limited to a visual mark, and may be unevenness that can be discerned by touch. The front shaft 30 may be configured in a polygonal shape (triangular, hexagonal, etc.) so that the entire shape functions as a landmark.

(Integration of parts)
At least at the time of this application, the aspect in which the front barrel 30 and the nib holding barrels 50, 150 are integrated as one piece is not excluded from the scope of the present invention.

Further, at least at the time of filing the present application, the aspect in which the front cylinder 30 and the rear cylinder 40 are integrated as one piece is not excluded from the scope of the present invention.

1, 101 writing implements 10, 110 nib 11, 111 front core portions 11a, 111a front end portions 11b, 111b acute angle forming plane portions 11c, 111c acute angle forming plane portions 12, 112 central core portions 12t, 112t tapered portions 13, 113 rear core Portions 13t, 113t Tapered portion 20 Ink absorbing body 30 Front cylinder (main body cylinder)
40 rear cylinder (main body cylinder)
50, 150 Pen tip holding cylinders 51, 151 Spare cylinders 51f, 151f Flanges 51r, 151r Air holes 52, 152 Holding cylinders 52p, 152p Holding projections 52s, 152s Slits 52r, 152r Vertical ribs 60 Caps G1, G2 Spacing L1 , L11 Length of upper end of front core portion in side view L2, L12 Length of lower end of front core portion in side view L3, L13 Length of upper end of spare cylinder portion in side view L4, L14 Length of lower end of spare cylinder portion in side view difference

Claims (10)

a nib having a front core, a central core, and a rear core;
an ink absorbing body that contacts the rear core portion of the pen tip and supplies ink to the rear core portion;
a body cylinder that accommodates the ink occluding body;
a pen tip holding tube that holds the central core portion of the pen tip and is held in the body tube;
with
the front core portion of the pen tip is thinner than the central core portion of the pen tip,
the rear core portion of the pen tip is also thinner than the central core portion of the pen tip,
The front end of the front core portion of the pen tip has a cut-out blade shape in which the upper end is located forward of the lower end in a side view,
The maximum length of the front core portion of the pen tip in a side view is 7 mm or more,
The pen tip holding tube has a spare tube portion extending around the front core portion of the pen tip except for the front end region of the front core portion,
The maximum length of the spare cylinder portion in a side view is 5 mm or more,
A writing instrument according to claim 1, wherein the space between the spare cylinder portion and the front core portion of the pen tip is 0.03 to 1.0 mm. The pen tip holding cylinder holds a front portion of the central core portion of the pen tip,
2. The writing instrument according to claim 1, wherein the body tube holds the rear portion of the central core portion of the pen tip. 3. The writing instrument according to claim 1, wherein the central core portion of the pen tip has a cylindrical shape. 4. The writing instrument according to claim 3, wherein the pen tip holding cylinder holds the central core portion of the pen tip at a plurality of locations spaced apart in the circumferential direction. 5. The writing instrument according to any one of claims 1 to 4, wherein the space between the spare cylinder portion and the front core portion of the pen tip is substantially constant. The front core portion of the pen tip has a cylindrical shape except for the front end region,
6. The writing instrument according to claim 5, wherein the spare cylinder portion has a cylindrical shape. The front core portion of the pen tip has a substantially quadrangular prism shape except for the front end region,
6. The writing instrument according to claim 5, wherein the preliminary cylindrical portion has a substantially square cylindrical shape. The front end of the spare cylinder part also has a cut-out blade shape in which the upper end is positioned forward of the lower end in a side view,
8. The writing instrument according to claim 6, wherein the front end of the front core portion of the pen tip and the front end of the spare cylinder portion are parallel when viewed from the side. 9. The writing instrument according to any one of claims 1 to 8, wherein at least part of said pen tip holding cylinder is made of a transparent material or a translucent material. 10. The writing instrument according to any one of claims 1 to 9, wherein a mark indicating the angular position of the pen tip is attached to the body tube and/or the pen tip holding tube.

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