JP2011148092A - Writing utensil - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a writing utensil which uses a fibrous pen point with a shell-like apex part, and ensures the availability of a specified handwriting width, even in the case that the handwriting direction and the handwriting angle vary. <P>SOLUTION: This writing utensil includes a bar-like pen point 6 made up of a resin fabricated body of fiber bundle, and the pen point 6 has the shell-like apex part 61. When the maximum outside diameter of the pen point 6 is D and the length of the apex part 61 of the pen point 6 in the axial direction is L, the ratio (L/D) of the length L to the maximum outside diameter D is 0.4 to 0.85. Further, the outside diameter of the apex part 61 of the pen point 6 in a remote position backward from the top of the apex part 61 of the pen point 6 by half the length L in the axial direction of the apex part 61 of the pen point 6, is represented by E the ratio (E/D) of the outside diameter E to the maximum outside diameter D of the pen point 6 is 0.85 to 0.9. Besides, the maximum outside diameter D of the pen point 6 is not less than 5.5 mm. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

The present invention relates to a writing instrument. In detail, it is related with the writing instrument provided with the rod-shaped nib which consists of a resin processed body of a fiber bundle.

2. Description of the Related Art Conventionally, a fiber pen tip for a writing instrument having a bullet-shaped tip is widely known (for example, Patent Document 1).

Japanese Utility Model Publication No. 64-52790

In the writing instrument using the pen tip having the conventional bullet-shaped tip, the direction in which the pen tip is moved (that is, the writing direction) and the angle between the pen tip axis and the writing surface (that is, the writing angle) are different. The handwriting widths obtained were different and it was difficult to obtain a certain handwriting width. In particular, in the case of a pen tip having a conventional bullet-shaped tip and a relatively large outer diameter (for example, when the maximum outer diameter of the pen tip is 5 mm or more), the handwriting width may vary depending on the writing direction or writing angle. It fluctuates greatly.

The present invention solves the above-mentioned conventional problems, and in a writing instrument using a fiber pen tip provided with a bullet-shaped tip, even if the writing direction and the writing angle are different, a certain handwriting width is ensured. It is intended to provide the resulting writing instrument.

<1> A first invention of the present application is a writing instrument including a rod-shaped pen tip 6 made of a resin processed body of fiber bundles, wherein the pen tip 6 includes a bullet-shaped tip portion 61, and the pen tip 6 When the maximum outer diameter is D and the axial length of the tip portion 61 of the pen tip 6 is L, the ratio of the length L to the maximum outer diameter D (L / D) is 0.4. It is required that it is -0.85 (preferably 0.5-0.75).

In the writing instrument 1 of the first invention, the ratio (L / D) of the axial length L of the tip portion 61 of the nib 6 to the maximum outer diameter D of the nib 6 is 0.4 to 0.85 ( By setting it in the range of preferably 0.5 to 0.75), even when the writing direction and the writing angle are different, a certain handwriting width is surely obtained. If the L / D value is smaller than 0.4, it is necessary to stand the pen tip 6 substantially perpendicular to the writing surface at the time of writing in order to obtain a constant handwriting width, and writing is not easy. . On the contrary, when the value of L / D is larger than 0.85, if the writing direction and the writing angle are different, the handwriting width is greatly different, and a constant handwriting width cannot be obtained.

The bullet-shaped tip 61 of the nib 6 is a tapered portion having an outer diameter that gradually decreases toward the tip, and is formed of a convex curved surface. The axial length L of the tip 61 of the nib 6 refers to the axial length from the apex of the tip 61 of the nib 6 to the rear end where the tapered shape ends. The maximum outer diameter D of the nib 6 refers to the maximum outer diameter behind the tip portion 61 of the nib 6.

<2> The second invention of the present application is that, in the writing instrument 1 of the first invention, the tip portion 61 of the nib 6 is a half of the axial length L of the tip portion 61 of the pen tip 6. When the outer diameter of the tip 61 of the pen tip 6 at a position away from the apex of the pen tip 6 is E, the ratio of the outer diameter E to the maximum outer diameter of the pen tip 6 with respect to D (E / D) is 0. The requirement is 85-0.9.

The writing instrument 1 according to the second invention further sets the ratio (E / D) of the outer diameter E to the maximum outer diameter D of the nib 6 within a range of 0.85 to 0.9, Even when the writing direction and the writing angle are different, a certain handwriting width can be reliably obtained. If the E / D value is smaller than 0.85, to obtain a constant handwriting width, it is necessary to stand the pen tip 6 substantially perpendicular to the writing surface during writing, and writing is not easy. . On the contrary, when the value of E / D is larger than 0.9, if the writing direction and the writing angle are different, the handwriting width is greatly different, and a constant handwriting width cannot be obtained.

The outer diameter E is the outer diameter of the intermediate portion of the tip portion 61 between the apex of the tip portion 61 of the nib 6 and the rear end where the tapered shape ends, and from the apex of the tip portion 61 of the nib 6. The outer diameter at a point separated from the apex of the front end portion 61 in the axial direction rearward by the length of L / 2.

<3> The third invention of the present application is that, in the writing instrument 1 of the first or second invention, the maximum outer diameter D of the nib 6 is 5.5 mm or more.

The writing instrument 1 according to the third aspect of the invention can reliably obtain a relatively thick and constant handwriting width even when the writing direction and the writing angle are different.

The writing instrument of the present invention ensures a certain handwriting width even when the writing direction and the writing angle are different.

It is a longitudinal cross-sectional view which shows embodiment of this invention. It is an enlarged front view of the 1st nib of FIG.

1 and 2 show an embodiment of the present invention.

The writing instrument 1 of the present embodiment includes a shaft cylinder 2, an ink storage body 5 impregnated with ink accommodated in the shaft cylinder 2, and a first pen tip connected to one end of the ink storage body 5. 6, a second pen tip 7 connected to the other end of the ink occluding body 5, a first cap 8 detachably attached to the shaft cylinder 2 on the first pen tip 6 side, The second cap 9 is detachably attached to the shaft cylinder 2 on the second pen tip 7 side. The ink may be either water-based ink or oil-based ink.

The shaft cylinder 2 includes a cylindrical front shaft 3 and a cylindrical rear shaft 4 connected to the front shaft 3. The front shaft 3 includes an attachment hole 31 into which the first pen tip 6 is press-fitted and fixed at one end, and an opening at the other end. The rear shaft 4 has an attachment hole 41 into which the second pen tip 7 is press-fitted and fixed at one end, and an opening at the other end. The opening at the other end of the front shaft 3 and the opening at the other end of the rear shaft 4 are connected to each other by press-fitting or screwing. On the inner wall of the mounting hole 31, a locking wall portion 32 that can contact the stepped portion 65 of the first nib 6 is formed. On the inner wall of the mounting hole 41, a locking wall portion 42 that can contact the stepped portion 75 of the second nib 7 is formed. The inner wall of the front shaft 3 is formed with a contact wall portion 33 on which one end of the ink storage body 5 can contact, and the other end of the ink storage body 5 can contact on the inner wall of the rear shaft 4. A contact wall 43 is formed.

The first nib 6 and the second nib 7 are resin processed bodies of fiber bundles made of synthetic resin. Examples of the first nib 6 and the second nib 7 include those obtained by fixing a converging body such as polyester fiber, acrylic fiber, or nylon fiber with a binder resin. Examples of the binder resin include polyurethane resin, melamine resin, epoxy resin, phenol resin, polyester resin, urea resin, xylene resin, and the like.

The first nib 6 and the second nib 7 are obtained by cutting a cylindrical continuous bar-shaped molded body (so-called original bar) to an appropriate length and grinding the front end and the rear end. It is done.

The first nib 6 includes a bullet-shaped tip 61, a cylindrical large diameter portion 62 that is connected to the rear of the tip 61, and a step formed at the rear end of the large diameter portion 62. It comprises a portion 65, a cylindrical small diameter portion 63 provided continuously from the step portion 65 to the rear, and a conical surface tapered portion 64 provided rearward from the small diameter portion 63.

The second nib 7 includes a bullet-shaped tip 71, a columnar large-diameter portion 72 continuously provided rearward from the tip 71, and a step formed at the rear end of the large-diameter portion 72. A portion 75, a columnar small diameter portion 73 continuously provided rearward from the stepped portion 75, and a conical surface tapered portion 74 provided rearwardly from the small diameter portion 73.

The large diameter portion 62 of the first nib 6 is press-fitted and fixed in the mounting hole 31 of the front shaft 3, and the step portion 65 of the first nib 6 is locked to the locking wall portion 32 of the front shaft 3. The small diameter portion 63 and the taper portion 64 of the first nib 6 are pierced and connected to one end of the ink occlusion body 5. Similarly, the large diameter portion 72 of the second nib 7 is press-fitted and fixed in the mounting hole 41 of the rear shaft 4, and the step portion 75 of the second nib 7 is fixed to the locking wall portion 42 of the rear shaft 4. The small diameter portion 73 and the taper portion 74 of the second nib 7 are pierced and connected to the other end of the ink occlusion body 5.

The outer diameter of the large-diameter portion 62 of the first nib 6 is the maximum outer diameter D, and is set to 5.5 mm or more (specifically 6 mm). The second nib 7 has a maximum outer diameter of 4 mm. A thick handwriting is obtained by the first pen tip 6, and a narrow handwriting is obtained by the second pen tip 7.

The ratio (L / D) of the axial length L of the tip 61 of the first nib 6 to the maximum outer diameter D of the first nib 6 is 0.4 to 0.85 (preferably 0.5 to 0.75). For example, the axial length L of the tip 61 of the first nib 6 is set to 4 mm, the maximum outer diameter D of the first nib is set to 6 mm, and the value of L / D is 0.67.

The first nib 6 at a position separated backward from the apex of the tip 61 of the first pen tip 6 by the length half of the axial length L of the tip 61 of the first nib 6. When the outer diameter of the front end portion 61 is E, the ratio (E / D) of the outer diameter E to the maximum outer diameter D of the first nib 6 is set to 0.85 to 0.9. . For example, the outer diameter E is set to 5.3 mm, the maximum outer diameter D of the first nib 6 is set to 6 mm, and the value of E / D is 0.88.

The tip portion 61 of the first nib 6 is a convex curved surface. The tip portion 61 of the first nib 6 is formed by a convex curved surface having two different radii of curvature, the apex-side radius of curvature R1 is set to 3.5 mm, and the large-diameter portion 62 side of the radius of curvature R2 is It is set to 8 mm. In the present embodiment, the apex of the tip portion 61 of the first nib 6 does not have a convex curved surface and has a pointed shape, but besides this, the tip portion 61 of the first nib 6 is also present. It is also possible to provide a convex curved surface at the vertex.

In the writing instrument 1 of the present embodiment, the ratio (L / D) of the length L in the axial direction of the tip portion 61 of the first nib 6 to the maximum outer diameter D of the first nib 6 is 0.4. Even if the writing direction and the writing angle are different by writing using the first nib 6 by setting in the range of ~ 0.85 (preferably 0.5 to 0.75). A handwriting with a width (for example, about 2.5 mm) is reliably obtained.

In the writing instrument 1 of the present embodiment, the ratio of the outer diameter E of the first nib 6 to the maximum outer diameter of the first nib 6 (E / D) is 0.85 to 0.9. By setting the range, even if the writing direction and the writing angle are different, a certain handwriting width can be surely obtained.

The writing instrument 1 of the present embodiment has a writing direction and a writing angle by writing using the first nib 6 because the maximum outer diameter D of the first nib 6 is 5.5 mm or more. Even if they are different, a relatively thick and constant handwriting width can be reliably obtained.

DESCRIPTION OF SYMBOLS 1 Writing implement 2 Shaft cylinder 3 Front shaft 31 Mounting hole 32 Locking wall part 33 Contacting wall part 4 Rear shaft 41 Mounting hole 42 Locking wall part 43 Contacting wall part 5 Ink occlusion body 6 1st pen point 61 Tip part 62 Large diameter portion 63 Small diameter portion 64 Taper portion 65 Step portion 7 Second pen tip 71 Tip portion 72 Large diameter portion 73 Small diameter portion 74 Taper portion 75 Step portion 8 First cap 9 Second cap D Maximum of the nib Outer diameter L The length of the tip of the nib in the axial direction E The outer diameter of the tip of the nib at a position separated by L / 2 from the apex of the tip of the nib

Claims (3)

A writing instrument having a rod-shaped pen tip made of a resin processed body of fiber bundles, wherein the pen tip has a bullet-shaped tip, the maximum outer diameter of the pen tip is D, and the tip of the tip of the pen tip A writing instrument, wherein a ratio (L / D) of the length L to the maximum outer diameter D is 0.4 to 0.85, where L is an axial length. When the outer diameter of the tip of the pen tip at a position away from the apex of the tip of the pen tip by the length half the axial length L of the tip of the pen tip is E, the outer The writing instrument according to claim 1, wherein a ratio (E / D) of the maximum outer diameter of the nib having a diameter E to D is 0.85 to 0.9. The writing instrument according to claim 1 or 2, wherein a maximum outer diameter D of the nib is 5.5 mm or more.

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