JP2007283703A - Grip structure of shaft tube and writing instrument and applicator having grip structure of shaft tube - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a grip structure of a shaft tube for improving aesthetic appearance of a shaft tube portion by increasing adhesion between a gel material and a core shaft, and for preventing dullness of a grip color even when the core shaft is made of metal. <P>SOLUTION: The grip structure 20 of a shaft tube 11 is provided which contains a coating material therein and is disposed in a grip portion 17 of the shaft tube 11, wherein the grip structure 20 of the shaft tube 11 comprises: an inner covering body 21 which contains a coating material inside thereof and is disposed outside of a core shaft 13 and directly covers the core shaft 13; an outer covering body 23 covering an outside of the inner covering body 21; and a self-shape retainable gel material 25 to be filled between the inner covering body 21 and the outer covering body 23; and the inner covering body 21 is formed of a material having its affinity with the gel material 25 higher than that with a material of the core shaft 13. The core shaft 13 is made of a metal and the inner covering body 21 is formed of a non-light transmissive material. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a grip structure employed in a writing instrument or an applicator, and a writing instrument or applicator provided with such a grip structure.

It is disclosed in the invention described in Patent Document 1 below to improve the grip feeling by enclosing a fluid material having fluidity in a grip portion in a writing instrument or application part. In the invention, a liquid material having fluidity is sealed in a space between the shaft body and the outer casing. Such a liquid material having fluidity escapes from the portion where pressure is applied by the finger when the grip portion is gripped by the fluidity, and there is no liquid material between the outer shell and the shaft body portion. In some cases, the gripping feeling cannot be improved, for example, the finger hits the metal shaft portion of the shaft tube and feels pain.
On the other hand, there exists a thing of patent document 2 as a technique which uses the gel which can hold self-shape in the grip part of the axial cylinder of a writing instrument or an applicator. According to this, although the gel-like substance is deformed at the portion hit by the finger, it does not escape from the core shaft part, and the buffering effect of the gel-like substance is not impaired.
Japanese Patent No. 3024731 JP 2004-291612 A

In the invention described in Patent Document 2, the gel-like substance capable of maintaining the self-shape and the core shaft are in close contact but are not bonded or fixed. The envelope body may be peeled off from the surface of the core shaft and air bubbles may be mixed in. In the case where the gel-like substance is formed to be light transmissive, such bubbles are visible from the outside, and the bubble portion and the close contact portion appear to be mottled.
Also, when the core shaft is made of metal such as stainless steel pipe or brass pipe, the color of the core shaft can be seen through the outer shell or gel material, so the grip color looks dull. is there.

In view of the above problems, a first object of the present invention is to improve the appearance of the shaft tube portion by improving the adhesion between the gel substance and the core shaft.
Moreover, in addition to the said 1st subject, this invention makes it a 2nd subject to prevent the dullness of a grip color, even if it is a case where a core axis | shaft is metal.
Furthermore, in addition to the second problem described above, the third object of the present invention is to enhance the effect of improving the dullness of the grip color.
In addition to the second problem described above, the present invention has a fourth problem of widening color variations while suppressing the dullness of the grip color.

Furthermore, in addition to the first problem described above, the present invention has a fifth problem of widening variations in the display mode of the grip portion.
In addition to the first, second, third, fourth, or fifth problem, the present invention has a sixth problem to improve the assembling property of the writing instrument.
Furthermore, this invention makes it a 7th subject to improve a moldability in addition to the said 1st, 2nd, 3rd, 4th, 5th or 6th subject.
In addition to the first, second, third, fourth, fifth, sixth, or seventh problem, an eighth problem of the present invention is to facilitate manufacture of the grip structure.

(1) 1st invention In view of the said 1st subject, 1st invention among this invention is the grip structure 20 of the axial cylinder 11 provided in the holding part 17 of the axial cylinder 11 incorporating a coating material, An inner covering 21 that is provided on the inner side of the core shaft 13 that accommodates the coated material and directly covers the core shaft 13, an outer covering 23 that covers the outer side of the inner covering 21, and the inner covering 21 A self-maintaining gel-like substance 25 filled between the outer casing 23 and the outer casing 23, and the inner casing 21 is more compatible with the gel-like substance 25 than the material of the core shaft 13. It is made of a high material.
Here, “applied product” refers to a substance to be applied to the surface to be applied, specifically, ink, core, paint, etc. used for the writing instrument 10 and cosmetics used for the applicator, corrections It refers to liquids, adhesives, drugs, etc. Note that the writing instrument 10 here can be in various forms such as a ballpoint pen, a mechanical pencil, a felt pen, and a sign pen, depending on the application to be used.

Further, the “shaft tube 11” refers to the writing instrument 10 or the structural part of the applicator that incorporates the above-described application. Here, as the mode in which the shaft cylinder 11 contains the coating material, there are a case where the shaft tube 11 itself directly stores the coating material and a case where a refill or cartridge containing the coating material is stored.
The “gripping part 17” refers to a part that is directly gripped with fingers in the shaft tube 11.
The “core shaft 13” refers to a structure that accommodates the coated material inside. Here, as a mode in which the core shaft 13 accommodates the coating material, there are a case where the core shaft 13 itself directly accommodates the coating material and a case where a refill or a cartridge accommodating the coating portion is accommodated. Among these, in the former case, “shaft cylinder 11” coincides with “core shaft 13”.

“Inner body 21” refers to a structure that directly covers the outer surface of core shaft 13.
The “outer casing 23” refers to a structure that covers the outer side of the inner casing 21 with a predetermined interval.
"Gel-like substance 25" is a substance filled between the inner casing 21 and the outer casing 23, and the polymer contains a liquid by a cross-linking action between chemical or physical polymers. This means a solid network structure in a state and the gel substance 25 itself formed so as to be able to maintain its own shape. Here, “self-shape retention is possible” means a viscoelastic body that does not have fluidity and is easily deformed by an external force such as a pressing force, but when the external force is removed, it can be restored to its original shape. means.
Here, “crosslinking” refers to reducing fluidity by applying some chemical force between molecules of the sol-like substance. The conditions for generating this chemical force vary depending on the type of sol-like substance used as a raw material. For example, when the crosslinking of the sol-like substance is promoted by heating to a predetermined temperature, it is necessary to heat to such a temperature. Moreover, even if nothing is done, in the case where the crosslinking proceeds by leaving it for a predetermined time or longer, it is necessary to leave it for such a time.

By providing such a gel-like substance 25 capable of maintaining a self-shape in the holding part 17 of the writing instrument 10 or the applicator, it becomes possible to mold with a low hardness, and when the holding part 17 is held, the gel Since the material 25 is easily deformed, the contact area between the finger and the grip part is increased, so that the gripping pressure is appropriately dispersed, and it is possible to provide an effect of improving grip feeling and reducing fatigue during long-time use. Become.
In addition, the self-maintaining gel-like substance 25 is deformed when gripped but does not flow compared to the case where a liquid substance having fluidity is used for the gripping part 17 of the writing instrument 10 or applicator. have. For this reason, it is possible to always feel a comfortable tactile feel of the gel-like substance 25 without directly touching the core shaft 13 through the outer casing 23, even if there are individual differences in strength of gripping force. Thus, it is possible to obtain a good grip feeling and an effect of reducing fatigue in long-time use. Furthermore, since the gel-like substance 25 can maintain its own shape, the gel-like substance 25 does not leak even if the outer cover 23 is damaged during use.

In the present invention, the inner body 21 is formed of a material having higher affinity for the gel substance 25 than the material of the core shaft 13. The affinity here means that, for example, when the gel-like substance 25 has a structure containing silicon, the chemical structure is common so that the inner body 21 is formed of a silicone resin. . This makes it difficult for the gel-like substance 25 to peel from the surface of the core shaft 13 when it is deformed by an external force, and the mixing of bubbles is also reduced. And when the gel-like substance 25 is formed so as to be light-transmissive, such an aesthetic defect due to such bubbles is also eliminated.
Further, the writing instrument 10 or applicator provided with the grip structure 20 as described above in the gripping part 17, that is, the inner covering that is provided on the outer side of the core shaft 13 that accommodates the coating material on the inner side and directly covers the core shaft 13. 21, an outer covering 23 that covers the outer side of the inner covering 21, and a self-maintaining gel-like substance 25 that is filled between the inner covering 21 and the outer covering 23, and The inner casing 21 is provided with a grip structure 20 of the shaft cylinder 11 formed in a material having a higher affinity with the gel-like substance 25 than the material of the core shaft 13 in the grip portion 17 of the shaft cylinder 11. In the writing instrument 10 or the applicator as a feature, not only the improvement of grip feeling by the gel-like substance 25 as described above and the effect of reducing fatigue in long-time use, but also the core shaft 13 due to deformation of the gel-like substance 25 is provided. It is also possible to reduce the mixing of bubbles associated with peeling from the surface.

(2) Second invention In view of the second problem, the grip structure 20 of the shaft cylinder 11 according to the second invention of the present invention is characterized in that the core shaft 13 is a metal in addition to the features of the first invention. The inner body 21 is made of a light non-transmissive material.
That is, when the material of the core shaft 13 is made of a metal such as stainless steel or brass, the color of the core shaft 13 can be seen through the gel substance 25 that can hold the self-shape. Although it may appear dull, according to the second aspect of the invention, the color of the core shaft 13 is masked by the light-impermeable inner body 21, thereby eliminating the dullness of the grip color. .

In the writing instrument 10 or the applicator according to the first invention, if the core shaft 13 is made of metal and the inner body 21 is formed of a light non-transparent material, Since the color of the core shaft 13 is masked by the transparent inner body 21, the dullness of the grip color is eliminated.
(3) Third invention In view of the third problem, the grip structure 20 of the shaft cylinder 11 according to the third invention of the present invention is characterized in that, in addition to the features of the second invention, the inner covering 21 is In addition to being white, the gel material 25 and the outer covering 23 are formed to be light transmissive.

Here, “light transmittance” specifically refers to any of colorless and transparent, colorless and translucent, colored and transparent, or colored and translucent.
That is, if the inner body 21 is white with a light non-transparent material, the color of the core shaft 13 does not pass through the light-transmissive gel-like substance 25, so the dullness of the grip color is further improved. It will be.
Further, in the writing instrument 10 or applicator according to the second invention, the inner covering 21 is white, and the gel substance 25 and the outer covering 23 are formed to be light transmissive. Since the color of the core shaft 13 is not transmitted through the light-transmitting gel material 25, the dullness of the grip color is further improved.

(4) 4th invention In view of the said 4th subject, the grip structure 20 of the axial cylinder 11 which concerns on 4th invention among this invention WHEREIN: In addition to the characteristic of the said 2nd invention, the said inner covering 21 is In addition to being colored, the gel-like substance 25 and the outer covering 23 are light transmissive.
That is, the color of the inner cover 21 can be visually recognized through the outer cover 23 and the gel-like substance 25, and various grip color variations can be realized while improving the dullness of the grip color.
Further, in the writing instrument 10 or the applicator according to the second invention, the inner covering 21 is colored, and the gel substance 25 and the outer covering 23 are light transmissive. The color of the inner body 21 can be visually recognized through the body 23 and the gel material 25, and various grip color variations can be realized while improving the dullness of the grip color.

(5) 5th invention In view of the said 5th subject, in addition to the characteristic of the said 1st invention, the said inner_body | body_body 21 is the grip structure 20 of the axial cylinder 11 which concerns on 5th invention among this invention. In addition to being light transmissive, an indication is given to a portion where the core shaft 13 is covered by the inner cover 21, and the gel substance 25 and the outer cover 23 are light transmissive. Features.
Here, “display” means that a visual effect is exhibited by characters, symbols, designs, patterns, and the like, and is specifically realized by printing, transfer printing, sticker sticking, or the like.
That is, even if it is desired to display something on the core shaft 13 by printing, transfer printing, sticking a sticker, or the like, the display is separated from the gel material 25 by the inner body 21, so The printing or transfer printing or sealing of the shaft cylinder 11 can be visually recognized, and there is no concern that chemical substances such as printing ink components or adhesives impede the crosslinking action of the gel-like substance 25.

In the writing instrument 10 or the applicator according to the first invention, the inner cover 21 is light transmissive, and a display is provided on a portion where the core shaft 13 is covered by the inner cover 21. Assuming that the gel substance 25 and the outer cover 23 are light transmissive, the indication on the core shaft 13 is separated from the gel substance 25 by the inner cover 21, Printing or transfer printing or sealing of the shaft cylinder 11 can be visually recognized through the substrate 23, and there is no concern about the effect of the gel substance 25 being hindered by the printing ink component or adhesive.
(6) 6th invention In view of the said 6th subject, the grip structure 20 of the axial cylinder 11 which concerns on 6th invention among this invention is the said 1st, 2nd, 3rd, 4th or 5th. In addition to the features of the invention, at least one of the part near the front end and the part near the rear end of the core shaft 13 is not covered with the inner body 21, and the surface of the core shaft 13 is exposed. It is characterized by.

That is, in the core shaft 13 portion where the gel substance 25 is disposed, a portion related to the assembly of the writing instrument 10 or the applicator, for example, a portion where a front screw tube 14 (structure in which a joint or a base is screwed) is mounted near the tip. It is desirable that there is no covering with the inner covering body 21 in the portion where the rear shaft 12 is screwed in the vicinity of the rear end.
Therefore, in the core shaft 13 portion, a part of the vicinity of the front end, a part of the vicinity of the rear end, or both of them are not covered with the inner covering body 21, and the surface of the core shaft 13 is exposed.
In the writing instrument 10 or applicator according to the first, second, third, fourth or fifth invention, at least one of a part of the core shaft 13 in the vicinity of the front end and a part of the vicinity of the rear end is If the surface of the core shaft 13 is exposed without being covered with the inner body 21, the assembly of the core shaft 13 and the members before and after the core shaft 13 is not hindered.

(7) 7th invention In view of the said 7th subject, the grip structure 20 of the axial cylinder 11 which concerns on 7th invention among this invention is the said 1st, 2nd, 3rd, 4th, 5th or 5th. In addition to the features of the sixth invention, a hook-like centering member 22 that protrudes outward along the outer periphery and contacts the inside of the outer cover 23 is provided in the vicinity of the rear end of the inner cover 21. It is characterized by that.
Here, the “centering member 22” is a member for aligning the axis of the outer casing 23 with the axis of the shaft cylinder 11, and the gel substance 25 to be filled is not biased in the outer casing 23. The purpose is to do so.

When the centering member 22 is formed as a part of the inner cover body 21, it is not necessary to form the centering member 22 on the outer cover body 23, and the shape of the outer cover body 23 can be simplified, and the mold structure can be simplified. Can be achieved.
Further, in the writing instrument 10 or applicator according to the first, second, third, fourth, fifth or sixth invention, the outer periphery of the inner casing 21 protrudes outward along the outer periphery. As a result, it is unnecessary to form the centering member 22 on the outer cover 23 and the shape of the outer cover 23 is simplified. It is possible to simplify the mold structure.

(8) Eighth Invention In view of the eighth problem, the eighth invention of the present invention is the feature of the first, second, third, fourth, fifth, sixth or seventh invention. In addition, the inner covering 21 is formed on the surface of the core shaft 13 by painting.
For example, this portion can be used as the inner body 21 by applying silicone paint to the surface of the core shaft 13.
In the writing instrument 10 or applicator according to the first, second, third, fourth, fifth, sixth, or seventh invention, the inner body 21 is formed on the surface of the core shaft 13 by coating. As a result, the inner body 21 can be easily formed.

(9) Ninth Invention In view of the eighth problem, the ninth invention of the present invention is characterized by the first, second, third, fourth, fifth, sixth, or seventh invention. In addition, the inner covering 21 is formed on the surface of the core shaft 13 by insert molding.
That is, the inner body 21 is formed by inserting the core shaft 13 into the mold and performing insert molding with, for example, silicone rubber on the surface thereof. By adopting this insert molding, it is possible to design the inner casing 21 to be thin, and even if it is desired to form the shaft cylinder 11 thinly, the gel material 25 layer thickness is sufficiently secured can do.

When the inner body 21 is formed by insert molding, it is desirable that the outer diameter of the inner body 21 is designed to be slightly increased from the front end to the rear end. By designing in this way, the mold can be drawn and tapered, so there is no need to make a split mold, and the split burrs on the surface of the inner body 21 can be eliminated and the number of molds taken can be reduced. Can do.
In the writing instrument 10 or the applicator according to the first, second, third, fourth, fifth, sixth or seventh invention, the inner body 21 is formed on the surface of the core shaft 13 by insert molding. If this is done, the die can be cut out and tapered, so there is no need to use a split die, and the split burrs on the surface of the inner body 21 can be eliminated, and the number of molds taken can be reduced. .

Since this invention is comprised as mentioned above, there exists an effect described below.
That is, according to 1st invention among this invention, it becomes possible to improve the beauty | look of a axial cylinder part by improving the adhesiveness of a gel-like substance and a core shaft.
Further, according to the second invention of the present invention, in addition to the effect of the first invention, it is possible to prevent dullness in the grip color even when the core shaft is made of metal.
Furthermore, according to the third aspect of the present invention, in addition to the features of the second aspect, it is possible to enhance the effect of improving the dullness of the grip color.
In addition, according to the fourth aspect of the present invention, in addition to the features of the second aspect, it is possible to expand the color variation while suppressing the dullness of the grip color.

Furthermore, according to the fifth aspect of the present invention, in addition to the features of the first aspect, it is possible to expand the variation of the display mode of the grip portion.
In addition, according to the fifth aspect of the present invention, in addition to the features of the first, second, third, fourth, or fifth aspects, it is possible to improve the assembling property of the writing instrument.
Furthermore, according to the seventh aspect of the present invention, in addition to the features of the first, second, third, fourth, fifth or sixth aspects, it is possible to improve the moldability.
Further, according to the eighth and ninth inventions of the present invention, in addition to the features of the first, second, third, fourth, fifth, sixth or seventh invention, the manufacture of the grip structure is facilitated. It becomes possible to.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a partial cross-sectional side view of a mechanical pencil as a writing instrument 10 according to an embodiment of the present invention. FIG. 2 is a plan view (A) of the inner casing 21 in the gripping portion 17 and a side view (B) showing a partial cross section of the core shaft 13 and the inner casing 21. FIG. 3 is a partial cross-sectional side view of the gripping portion 17.
Note that the writing instrument and the applicator are not limited to mechanical pencils, and a writing instrument such as a ballpoint pen, a brush pen, a fountain pen, or an applicator containing a correction liquid can be used.
Further, in the present specification, “front” refers to the pen tip side direction, and “rear” refers to the anti-pen tip side direction.

In the present embodiment, the gripping part 17 of the mechanical pencil as the writing instrument 10 has a grip structure 20 as described below.
The shaft cylinder 11 is composed of two parts, a core shaft 13 disposed on the front end side in the axial direction and a rear shaft 12 disposed on the rear end side. The core shaft 13 and the rear shaft 12 are fixed to each other by screwing to form a shaft cylinder 11.
The core shaft 13 has a cylindrical shape made of stainless steel (see FIG. 2B). A core 19 as an application body is accommodated in the core shaft 13 (see FIG. 1).
The outer surface of the core shaft 13 is covered with an inner cover body 21 as shown in FIG. The inner body 21 is made of white silicone, and is formed on the surface of the stainless steel core shaft 13 by insert molding. The inner casing 21 is slightly enlarged in diameter from the front end to the rear end. Thereby, a metal mold | die can be extracted and it can be made into a taper. Further, in the vicinity of the rear end of the inner casing 21, as shown in FIG. 2 (A), three identically-shaped eaves-like structures equally spaced at 120 ° intervals are provided. As shown in FIG. 3, these function as a centering member 22 for centering the rear end portion of the outer casing 23 with respect to the core shaft 13.

As shown in FIG. 3, an outer cover 23 is provided so as to cover the inner cover 21. An annular convex portion 24 is provided on the inner surface of the front end portion of the outer cover body 23, and this is in contact with the distal end portion of the inner cover body 21. Further, the inner surface of the rear end portion is centered by abutting with the peripheral edge of the centering member 22 of the inner body 21. Further, the outer periphery of the rear end portion of the outer cover 23 has a reduced outer diameter, and a ring member 18 that comes into contact with the front end of the rear shaft 12 is attached to this portion (see FIG. 1).
On the other hand, the inner end body 21 is not covered at the front end of the core shaft 13, and the front threaded tube 14 is attached thereto (see FIG. 3). As shown in FIG. 1, a base 16 is screwed to the front screw tube 14. Here, the rear end of the base 16 is in contact with the front end of the outer casing 23.

Further, the inner cover 21 is not covered at the rear end of the core shaft 13, and a rear screw tube 15 is attached here (see FIG. 1). As shown in FIG. 1, the rear shaft 12 is screwed onto the rear screw tube 15.
The space between the inner cover body 21 and the outer cover body 23 formed by fixing the core shaft 13 and the outer cover body 23 via the inner cover body 21 is a gel-like shape that can maintain a self-shape. Substance 25 is built in.
The outer cover 23 is not particularly limited as long as it is an elastic material, and an elastic material such as silicone rubber, urethane rubber, ethylene propylene rubber, or the like can be used. Silicone rubber is particularly desirable.
As long as the gel-like substance 25 can maintain its self-shape, any gel-like substance such as silicone gel, acrylic gel, and urethane gel can be used, but silicone gel is particularly desirable. As an example of such a commercially available gel-like substance, “αGEL” (registered trademark) manufactured by Geltech Co., Ltd. may be mentioned.

As a method for assembling the core shaft 13 portion in the present embodiment, the outer cover body 23 is inserted from the front of the core shaft 13 in which the inner cover body 21 is insert-molded, and the inner surface of the outer cover body 23 is attached to the centering member 22 of the inner cover body 21. Just plug it in until it comes into contact.
Then, the gel-like substance 25 is injected from a gap formed between the centering members 22 of the inner body 21. That is, an injection nozzle (not shown) is inserted from the gap between the centering members 22, and the gel substance 25 is injected through the injection nozzle. There may be one injection nozzle or a plurality of injection nozzles, but there is an advantage that the injection time can be shortened by using a plurality of injection nozzles. The gel-like substance 25 is still sol-like and fluid at the stage of injection, and is cured by allowing it to stand at room temperature or heating after injection, thus allowing the self-shape to be maintained. A typical example of such a gel substance 25 is as shown in the following formula.

RR ¹ ₂ SiO— (R ² ₂ SiO) _n SiR ¹ ₂ R (Formula 1)
(However, R is an alkenyl group, R ¹ is a monovalent hydrocarbon having no aliphatic unsaturated bond, R ² is a monovalent aliphatic hydrocarbon group (at least 50 mol% of R ² is methyl In the case of having an alkenyl group, the content is 10 mol% or less), and n is a number such that the viscosity of this component at 25 ° C. is 100 to 10,000 cSt.)
The gel-like substance 25 shown in the above formula 1 is an organohydrosiloxane having a diorganopolysiloxane (component A) and a viscosity at 25 ° C. of 5,000 cSt or less and having at least hydrogen atoms directly bonded to Si atoms in one molecule. Contained in diorganopolysiloxane (component A) with respect to the total amount of hydrogen atoms consisting of genpolysiloxane (component B) and directly bonded to Si atoms in diorganohydrogenpolysiloxane (component B) It is an addition-type silicone copolymer obtained by curing a mixture adjusted so that the ratio (molar ratio) of the total amount of arnikel groups is 0.1 to 2.0.

The curing reaction of the gel substance 25 shown in the above formula 1 is performed using a catalyst, and the catalyst is preferably a platinum-based catalyst. Examples thereof include finely crushed elemental platinum, chloroplatinic acid, platinum oxide, platinum, and the like. Examples thereof include complex salts with olefins, platinum alcoholates, and complex salts of chloroplatinic acid and vinyl siloxane.
After mixing the above-described A component, B component, and catalyst, the gel material 25 having fluidity is injected into the space between the inner casing 21 and the outer casing 23 by the injection nozzle. . After this space is filled with the gel-like substance 25, the gel-like substance 25 can maintain its own shape by being left at room temperature or being cured by heating.

Due to the chemical structure described above, the gel-like substance 25 is similar in chemical structure to the inner shell 21, has a higher affinity with the inner shell 21 than the stainless steel rear shaft 13, and has good adhesion. .
The grip structure 20 is formed by the inner casing 21, the gel material 25, and the outer casing 23 described above.
When the above-described gel-like substance 25 is colored transparent or colored translucent, the metal color of the core shaft 13 is masked by the white inner body 21, and the color of the gel-like substance 25 can be expressed as it is.

  The present invention can be used for a grip portion of a writing instrument or an applicator.

It is a partial cross section side view of a mechanical pencil as a writing instrument concerning an embodiment of the invention. It is the top view (A) of the inner covering in a holding part, and the side view (B) which showed the core shaft and the inner covering in a partial cross section. It is a partial cross section side view of a holding part.

Explanation of symbols

10 Writing instrument 11 Shaft cylinder 12 Rear axle
13 Core shaft 14 Front threaded tube 15 Rear threaded tube
16 Base 17 Holding part 18 Ring member
19 core
20 Grip structure 21 Inner body 22 Centering member
23 Enclosure 24 Annular convex 25 Gel-like substance

Claims (12)

A grip structure of a shaft cylinder provided in a grip portion of a shaft cylinder containing a coating,
An inner covering body that is provided outside the core shaft that accommodates the coating material on the inside and directly covers the core shaft;
An outer covering covering the outer side of the inner covering;
A self-maintaining gel-like substance filled between the inner body and the outer body,
The shaft cylinder grip structure, wherein the inner body is formed of a material having a higher affinity with the gel material than a material of the core shaft. The core shaft is made of metal,
2. A grip structure for a shaft cylinder according to claim 1, wherein the inner body is made of a light-opaque material.   3. The shaft cylinder grip structure according to claim 2, wherein the inner casing is white, and the gel substance and the outer casing are formed to transmit light.   3. The shaft cylinder grip structure according to claim 2, wherein the inner body is colored, and the gel substance and the outer body are light-transmissive.   The inner body is light-transmitting, and the portion where the core shaft is covered with the inner body is marked, and the gel-like substance and the outer body are light-transmissive. The grip structure of the shaft cylinder according to claim 1.   The surface of the core shaft is exposed without covering at least one of a part near the front end of the core shaft and a part near the rear end of the core shaft. The grip structure of the shaft cylinder according to 3, 4, or 5.   A hook-shaped centering member is provided near the rear end of the inner cover so as to protrude outward along the outer periphery and contact the inner side of the outer cover. The grip structure of the shaft cylinder according to 4, 5, or 6.   8. The grip structure of a shaft cylinder according to claim 1, wherein the inner body is formed on the surface of the core shaft by painting.   The shaft cylinder grip structure according to claim 1, 2, 3, 4, 5, 6 or 7, wherein the inner body is formed on the surface of the core shaft by insert molding.   The shaft cylinder grip structure according to claim 9, wherein an outer diameter of the inner cover body is slightly enlarged from a front end to a rear end. An inner covering body that is provided outside the core shaft that accommodates the coating material on the inside and directly covers the core shaft;
An outer covering covering the outer side of the inner covering;
A self-maintaining gel-like substance filled between the inner body and the outer body,
The writing instrument according to claim 1, wherein the inner casing is provided with a grip structure of a shaft cylinder formed of a material having a higher affinity with the gel substance than a material of the core shaft. An inner covering body that is provided outside the core shaft that accommodates the coating material on the inside and directly covers the core shaft;
An outer covering covering the outer side of the inner covering;
A self-maintaining gel-like substance filled between the inner body and the outer body,
An applicator characterized in that the inner casing is provided with a grip structure of a shaft cylinder formed of a material having a higher affinity with the gel-like substance than a material of the core shaft in a grip portion of the shaft cylinder.

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