JPH0655890A - Core body of writing implement, etc., and preparation of the same - Google Patents

Abstract

PURPOSE:To provide a core body of a flexible writing implement, etc., which can be held firmly without being sunk into a pen shaft by the pressure a writer puts on the pen and to provide its preparation method. CONSTITUTION:A pen head 2a and a joining shaft 2b which are made of a material having the property of compression recovery are molded integrally to form a core member 2, and a joint part comprising a ring-shaped groove 3 is installed on the periphery of the required part of the shaft 2b of the core member 2. A hard ring-shaped member 4 having a hole with an inner diameter smaller than the outer diameter of the shaft 2b is inserted into the groove 3 by compressing the shaft 2b, etc., so that a core body 1 is formed while the bonded ring-shaped member 4 being held in the groove 3 without the pressure due to the recovered shaft 2b and the groove 3.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a core used in a writing instrument such as a felt-tip pen and a makeup tool such as an eyeliner (hereinafter referred to as a writing instrument) and a method for producing the core.

[0002]

2. Description of the Related Art A core material for writing instruments, makeup tools, etc.
The synthetic resin fibers are bundled into a rod shape to provide a capillary action,
Liquid such as ink loaded in the pen shaft body is drawn out from the pen tip, and such a core body is selected in consideration of various properties such as material, size, physical characteristics, and writing characteristics depending on the purpose of use. To be done. Thus, a generally used rigid core body has a rigidity of, for example, Japanese Utility Model Publication No. 52-4617.
As described as a conventional example of Japanese Patent No. 2 publication, the pen tip is simply press-fitted and fixed in the mouthpiece, or fixed with an adhesive, and the mouthpiece is caulked and fixed. The writing pressure may cause the pen tip to sink into the pen shaft body. Therefore, in order to reinforce the depression strength due to the writing pressure, a step is provided on the outer periphery of the core body, and the stepped portion is brought into contact with a stepped portion provided on the inner periphery of the pen shaft body to be fixed,
A method of press-fitting and fixing a hard core body by utilizing the deformation of a mouthpiece made of a relatively soft material as disclosed in the above publication, or a method of perforating a core body and a shaft body in common and penetrating a wire therethrough. There is. Also, the actual Kaihei 3-7499
As can be seen in Japanese Patent Laid-Open No. 2 (1994), there is also known a method of fixing a rod-shaped pen body having high flexibility to a pen shaft main body provided with an exclusive engaging portion.

[0003]

A soft core such as a soft marker, a brush pen, a brush pen, and an eyeliner pen has a small pen pressure because the engaging portion with the pen shaft body is easily deformed. For example, there is a risk that the pen shaft body may be easily depressed. Further, a method of providing a stepped portion on the core body and fixing the core body can be also taken, but it is not sufficient for reliable fixation. Further, when the core body is strongly fitted to the pen shaft main body like the hard core body, the core body may be pressed and the flow of ink may be hindered. On the other hand, the method of penetrating the wire and fixing it to the pen shaft body may damage the core body itself at the time of punching,
Even if the wire can be fixed without damage, the wire passing through the fiber may disturb the focusing of the fibers, resulting in inconvenience.

In view of the above-mentioned circumstances, the present invention utilizes the compression restoring property of the core itself to fix the flexible core having the compression restoring property to the pen shaft main body. The object is to provide a core body for a writing instrument or the like, which is equipped with a ring-shaped member to be fixed, thereby further improving the depression strength due to the writing pressure, and a method for manufacturing the core body.

[0005]

In order to achieve the above object, the core body of the writing instrument and the like of the present invention is formed by integrally molding a pen tip portion and a shaft portion connected to the pen tip portion with a material having a compression restoring property. To form a core member, and to form a ring-shaped engaging portion on the outer periphery of a predetermined portion of the shaft portion of the core member,
A ring-shaped member having an insertion hole of an inner diameter or an inner diameter smaller than the outer diameter or outer shape of the shaft portion is engaged and held in the engagement portion so that the ring-shaped member does not press the shaft portion at the engagement portion. It is characterized by.

On the other hand, according to the method of manufacturing a core body in a writing instrument or the like of the present invention, a core member integrally formed with a pen tip portion and a shaft portion connected to the pen tip portion is molded by a material having a compression restoring property to obtain a core member. A ring-shaped engaging portion is formed on the outer periphery of a predetermined portion of the shaft portion of the core member, and a hard ring-shaped member having an inner diameter or inner diameter smaller than the outer diameter or outer shape of the shaft portion of the core member. The member is formed as a separate body, and the ring-shaped member is inserted from the tip of the shaft portion of the core member to the engaging portion while compressing the shaft portion using the insertion hole, and the compressed shaft portion is restored. Thus, the ring-shaped member is held in the engaging portion without pressing the shaft portion in the engaging portion.

In the core of the writing instrument and the like of the present invention, the core member, which is the main body of the core, is formed of a material having a compression-restoring property known in the writing instrument and the like, and does not impair the characteristics as the core. The core has a compression recovery property of preferably 10% or more, more preferably 15% or more with respect to the cross-sectional area of the core body, and its cross-sectional shape may be various cross-sectional shapes such as a circular shape and a square shape. So there is no limit.

[0008] Such a core member integrally forms a ring-shaped engaging portion on the outer periphery of a predetermined portion of the shaft portion. The engaging portion is a ring formed in the vertical direction on the shaft portion. -Shaped groove or vertical to the base end portion of the pen tip by integrally connecting one end of a shaft portion having an outer diameter smaller than the outer diameter of the base end portion on the same axis. It may be a ring-shaped groove formed in the direction perpendicular to the shaft portion that follows the step.

The ring-shaped member engaged with and held by the engaging portion has an insertion hole having an inner diameter or inner shape smaller than the outer diameter or outer shape of the shaft portion constituting the core member, and has resistance to the liquid used. As long as it has appropriate hardness and rigidity that is not deformed by use, its material is not particularly limited, but synthetic resin such as hard polypropylene, hard polyethylene, hard vinyl chloride resin, polycarbonate, polystyrene or stainless steel. A metal such as steel or aluminum can be preferably used, and it can be obtained inexpensively and easily by punching the thin plate of the synthetic resin or metal or cutting the formed tubular body. Depending on the structure of the shaft body to which the core is attached, these ring-shaped members may be provided with appropriate irregularities or grooves on the surface, or may be provided with air circulation holes.

Hereinafter, a core body and a usage example thereof in the writing instrument and the like of the present invention will be specifically described with reference to the accompanying drawings. The core body 1 of the writing instrument or the like of the present invention is basically composed of a core member 2 and a ring-shaped member 4 that engages and holds the core member 2 as shown in FIG. The core member 2 is composed of a pen tip portion 2a having a bullet-like tip portion and a shaft portion 2b connected to the pen tip portion 2a. The pen tip portion 2a and the shaft portion 2 are provided.
A ring-shaped recessed groove 3 is formed in the outer periphery of a portion continuously provided with b in the direction perpendicular to the axis, and a ring-shaped member 4 having an insertion hole having a diameter smaller than the outer diameter of the shaft portion 2b is formed in the recessed groove 3. For example, after compressing the core member 2 from the tip end portion of the pen tip portion 2a and advancing it in the base end direction, the ring-shaped member 4 is engaged and held in the concave groove 3. At that time, the shaft portion that is the bottom of the concave groove 3 is not pressed by the ring-shaped member 4, and the ring-shaped member 4 is held without being separated from the concave groove 3.

As shown in FIG. 2, such a core body 1 is inserted into an inscribed hole 6 at the tip of the pen shaft body 5 so that one surface of the ring-shaped member 4 abuts on the tip of the pen shaft body 5. If necessary, the ring-shaped member 4 is attached to the tip of the pen shaft body 5 by adhesively fixing it, and by this attachment, the core body 1 is securely held without being depressed in the pen shaft body 5 by the writing pressure. be able to. Reference numeral 7 in FIG. 2 is an air hole provided at the opening edge of the tip portion of the pen shaft main body 5, and the inner contact hole 6 forms a modified cross section for the smooth outflow of ink as shown in FIG.
An appropriate gap is partially formed between the core body 1 and the core body 1.

In the core body 8 in FIG. 4, a step portion 10 is formed by reducing the diameter of a base end portion of a pen-tip portion 9a having a cannonball shape at a right angle, and the step portion 10 is brought into contact with the pen tip portion 9a. A shaft member 9b having a smaller diameter than the outer diameter is integrally connected to form a core member 9, and a ring-shaped recessed groove 11 is formed on the outer periphery of the shaft member 9b in contact with the step portion 10 in a direction perpendicular to the shaft. And the groove 1
1, a ring-shaped member 12 having an insertion hole having a diameter smaller than the outer diameter of the shaft portion 9b is advanced in the proximal direction while compressing the core member 9 from the shaft portion 9b, and then the ring member 12 is recessed. The ring-shaped member 12 is held in the groove 11 by being engaged with the shaft portion 9b without pressing the shaft portion 9b.

The core body 8 has a core member 9 as shown in FIG.
The shaft 9b is inserted into the tip opening of the pen shaft main body 13, and the ring-shaped member 12 is brought into contact with and fixed to the stepped portion 15 formed in the inscribed hole 14 of the pen shaft main body 13. The pen tip 9a does not sink into the pen shaft body 13. As shown in FIG. 6, the indentation hole 16 of the pen shaft body 13 is provided with a concave-convex strip 16 for smoothing the ink flow.
A modified cross section having
The ridges are in contact with and retained.

The core body 20 shown in FIG. 7 is composed of a core member 21 in which the tip of a belt-shaped body having a predetermined thickness is tapered to form a pen tip portion 21a, and the other portion is a shaft portion 21b. , A shaft portion 21b close to the pen tip portion 21a
A ring-shaped recessed groove 22 is formed so as to surround the outer periphery of the ring-shaped recessed member 22, and a ring-shaped member 23 having a square outer shape having an insertion hole having an inner shape smaller than the outer shape of the core member 21 is formed in the recessed groove 22.
b is held without being pressed, the core member 21 has a compression restoring property of 10% or more in the long side direction, and the ring-shaped member 23 is a rectangular insertion hole whose long side corresponds to a compression rate of 10%. have.

The core 24 shown in FIG. 8 has a stepped portion 26 formed by reducing the diameter of the base end of the pen-shaped portion 25a in the shape of a bullet to a right angle, and the stepped portion 26 is in contact with the pen-shaped portion 25a. A shaft member 25b having a smaller diameter than the outer diameter is integrally connected to form a core member 25,
A ring-shaped concave groove 27 is formed on the outer periphery of the shaft portion 25b so as to be in contact with the step portion 26 in a direction perpendicular to the axis, and the flange portion 28a abuts the proximal end surface of the pen tip portion 25a in the concave groove 27. A ring-shaped member 28 having an insertion hole having an inner diameter smaller than the outer diameter of the shaft portion 25b is engaged and held in the groove 27, and the ring-shaped member 28 holds the shaft portion 25b in the groove 27. It is held without being pressed.

[0016]

The core material of the writing instrument of the present invention has an inner shape or inner diameter smaller than the outer diameter or outer diameter of the shaft portion in the ring-shaped engaging portion formed on the shaft portion of the core member having the compression restoring property. Since the ring-shaped member is engaged without pressing the shaft portion, the shape-preserving ring-shaped member retains the shape of the flexible core member by attaching this core body to the pen shaft body. Therefore, it is possible to maintain the excellent writing characteristics without being depressed due to the writing pressure, and to accurately fix it to the mounting portion of the pen shaft main body.

[0017]

EXAMPLES The core of the writing instrument of the present invention will be described in more detail below with reference to examples and comparative examples. Example 1 and Comparative Example 1 A relatively flexible material having a compressibility of 15% and having a restoring property obtained by focusing and binding polyester fibers with a flexible urethane resin liquid, as shown in FIG. The tip portion is formed into a bullet-like shape to form a pen tip portion 2a, and a core member 2 having a diameter of the shaft portion 2b of 5 mm and a total length of 32 mm from the pen tip portion 2a to the base end portion of the shaft portion 2b is formed. The groove 3 having a depth of 0.2 mm and a width of 0.8 mm was formed in a ring shape on the outer periphery of the shaft portion 2b 12 mm from the tip of the pen tip portion 2a of the member 2. A ring-shaped member 4 formed by punching a hard polypropylene thin plate into a flat washer shape was fitted into the groove 3 to obtain a core 1 for a writing instrument. This ring-shaped member 4 is
With an outer diameter of 7.0 mm and a thickness of 0.8 mm having an insertion hole with an inner diameter of 4.5 mm, the tip of the core member 2 is inserted into the insertion hole of the ring-shaped member 4 and press-fitted while forcibly shifting. The ring-shaped member 4 is fitted in the groove portion 3. The base end of the core body 1 thus obtained is inserted from the tip of the inscribed hole 6 having a diameter of 4.6 mm of the pen shaft body 5 constituting the pen shaft, and the ring-shaped member 4 is attached to the tip of the pen shaft body 5. It was held securely by abutting. With respect to the core body 1, a load (K when the core body 1 is depressed in the pen shaft body 5 by applying a load in the vertical direction with the pen shaft body 5 facing downward) (K
A collapse test was performed to measure g). 5 of these tests
Five samples were prepared for each sample (Sample 1 to Sample 5), and as Comparative Example 1, a core body having the same size without forming the groove 3 and having no ring-shaped member 4 was attached to the pen shaft main body. The same depression test was performed on the samples (Sample 1 to Sample 5). The results are shown in Table 1. The ink characteristics of the core according to Example 1 were good.

[0018]

[Table 1]

Example 2 and Comparative Example 2 As shown in FIG. 4, a shell-like shape having a base end diameter of 5 mm
Shaft portion 9 having a diameter of 4.65 mm on the base end surface of the pen tip portion 9a.
b is integrally coupled on the same axis to form a vertical step portion 10 to form a core member 9, and the step portion 1 is formed.
0 in contact with the outer circumference of the shaft 9b in a ring shape with a depth of 0.125
A brass groove having an outer diameter of 5 mm and a width of 1.0 mm is provided in which a groove 11 having a width of 1.0 mm and a width of 1.0 mm is provided, and the groove 11 has an insertion hole having an inner diameter of 4.4 mm from the tip of the shaft portion 9b of the core member 9. The ring-shaped member 12 was press-fitted and engaged to obtain a core body 8 for a writing instrument. The compression rate at that time was 10%. The core body 8 thus obtained is fitted into the pen shaft main body 13 forming the pen shaft shown in FIGS. 5 and 6 from the tip of the inscribed hole 14 having a diameter of 4.5 mm, and the portion of the ring-shaped member 12 is inserted into the pen shaft. Inner hole 1 of body 13
4 was brought into contact with the stepped portion 15 formed inside and securely held. A depression test similar to that in Example 1 was performed on this writing instrument. Separately, as Comparative Example 2, the ring-shaped member 1
A similar depression test was carried out on a core body of the same size having only a step portion where 2 was not fitted and which was similarly attached to the pen shaft main body. The results are shown in Table 2. The core of Example 2 had good ink characteristics.

[0020]

[Table 2]

[0021]

The core material of the writing instrument of the present invention is formed by integrally molding the pen tip portion and the shaft portion connected to the pen tip portion with a material having a compression restoring property to form a core member. A ring-shaped engaging portion is provided on the outer periphery of a required portion of the shaft portion, and a ring-shaped member having an inner diameter or an inner diameter smaller than the outer diameter or the outer diameter of the shaft portion is attached to the engaging portion. The pen tip portion was inserted while being compressed, and the ring-shaped member was held so as not to press the shaft portion at the engaging portion, so that the flexible core body is depressed into the pen shaft body due to writing pressure during use. There is no fear.

Particularly, in the present invention, a ring-shaped member having an insertion hole smaller than the shaft portion is inserted into the shaft portion constituting the core member while compressing the shaft portion and the like, and the restoring force of the shaft portion and the like is applied. Since the ring-shaped member is engaged and held and the shaft is not pressed by the ring-shaped member, the flowability of ink and the like is not impaired and the writing characteristics are not impaired. Further, the core body of the present invention has an extremely simple structure in which the shaft portion forming the core member is provided with the engaging portion, and the hard ring member is engaged and held by the engaging portion.
It can be manufactured at low cost. Further, the core body of the present invention can be easily and surely fixed to various pen shaft main bodies etc. for which a means for fixing a flexible pen body is not particularly taken, and has a great practical effect. Can be expected.

On the other hand, in the method for manufacturing the core body of the writing instrument or the like of the present invention, the engaging portion of the shaft portion of the core member having the compression restoring property has an inner diameter or inner shape smaller than the outer diameter or outer shape of the shaft portion. A hard ring-shaped member having an insertion hole is inserted while compressing the shaft portion and the like, and the ring-shaped member is engaged and held in the engaging portion without pressing the shaft portion to manufacture a core body. The core body can be manufactured extremely easily and without requiring large equipment, and the obtained core body does not have a possibility of being depressed in the pen shaft body due to writing pressure or the like. It has advantages.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view showing an example of a core body in a writing instrument or the like of the present invention.

FIG. 2 is a partial vertical cross-sectional view when the core body of FIG. 1 is attached to a pen shaft main body.

3 is a cross-sectional view taken along the line AA in FIG.

FIG. 4 is a vertical cross-sectional view showing another example of the core body of the writing instrument and the like of the present invention.

5 is a partial vertical cross-sectional view when the core body of FIG. 4 is attached to a pen shaft main body.

6 is a sectional view taken along line BB in FIG.

FIG. 7 is a vertical cross-sectional view showing another example of the core body in the writing instrument and the like of the present invention.

FIG. 8 is a vertical cross-sectional view showing still another example of the core body of the writing instrument or the like of the present invention.

[Explanation of symbols]

 1 core body 2 core member 2a pen tip portion 2b shaft portion 3 concave groove 4 ring member 5 pen shaft main body 6 inscribed hole 8 core body 9 core member 9a pen tip portion 9b shaft portion 10 step portion 11 concave groove 12 ring shape Element

Claims (5)

[Claims] 1. A core member is formed by integrally molding a pen tip portion and a shaft portion connected to the pen tip portion with a material having a compression restoring property, and at the outer periphery of a predetermined portion of the shaft portion of the core member. A ring-shaped member having a ring-shaped engaging portion and an insertion hole having an inner diameter or an inner diameter smaller than the outer diameter or outer shape of the shaft portion is formed in the engaging portion. A core body for a writing instrument or the like, which is engaged and held so as not to be pressed. 2. The core body for a writing instrument or the like according to claim 1, wherein the engagement portion is a ring-shaped concave groove formed in the shaft portion of the core member in a vertical direction. 3. The engaging portion is integrally formed with the base end portion of the pen tip by connecting one end of a shaft portion having an outer diameter smaller than the outer diameter of the base end portion on the same axis. The core body for a writing instrument or the like according to claim 1 or 3, wherein a vertical step is formed and a ring-shaped concave groove is formed in a shaft portion following the step in a vertical direction. 4. The core body for a writing instrument or the like according to claim 1, wherein the ring-shaped member is made of a synthetic resin material or a metal material having appropriate hardness and rigidity. 5. A core member integrally formed with a pen tip portion and a shaft portion connected to the pen tip portion is molded from a material having a compression-restoring property, and a ring is formed on an outer periphery of a predetermined portion of the shaft portion of the obtained core member. -Shaped engaging portion is formed, and a hard ring-shaped member having an inner diameter or inner diameter insertion hole smaller than the outer diameter or outer shape of the shaft portion of the core member is separately formed, and the insertion hole is used. Then, the ring-shaped member is inserted from the distal end portion of the shaft portion of the core member to the engaging portion while compressing the shaft portion, and the compressed shaft portion is restored so that the ring-shaped member is attached to the engaging portion. A method for manufacturing a core body for a writing instrument or the like, characterized in that it is held in the engaging portion without being pressed.