JPH11139070A - Barrel for writing implement - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the dislocation and rotation of a barrel cylinder and a skin, to improve appearance by making the color and residue of ink visible, narrowing a shaft, and doing other things, to improve durability to widen a material selection range when the skin is made from rubber, to improve functions to create soft, fitting touch, and to provide an inexpensive barrel of writing implement without increasing costs. SOLUTION: In a writing implement barrel, a barrel cylinder a based on a barrel and a synthetic resin skin at least part of which appears near the outside surface outside the barrel cylinder 1 are double molded, part of the cylinder 1 is in a state in which a through hole 3 is bored to the inside, the skin is molded to close the through hole 3, and the vicinity of the inside diameter of the through hole 3 of the cylinder 1 is of nearly the same size with the inside diameter of the through hole filing part of the skin and is not protruded inside.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an outer appearance of a writing instrument shaft, a grip portion, and the like. In particular, the present invention makes it possible to visually check the ink color and remaining amount without removing the ink and mechanism inside the writing instrument. The present invention relates to an axis of a writing implement which is required to have an anti-slip function required in a case where there is a demand or a long time writing.

[0002]

2. Description of the Related Art Conventionally, a writing instrument has a so-called oil-based ballpoint pen using high-viscosity ink in which ink is directly incorporated in an ink storage tube, or a water-based ballpoint marker having a low-viscosity aqueous ink and a collector serving as an internal pressure regulator. Neutral ballpoint pens that have an intermediate property between oils and water, ink pens that have a valve mechanism at the pen tip, and inks that are directly built-in, correction fluids that contain highly concealable inks And so on. In these writing instruments, there is a demand for visually confirming the ink consumption and the color of the ink. In the past, the problem was solved by making the shaft parts transparent or translucent.However, the whole transparent thing can be seen to the rear end that is unnecessary and the ink color visible from the refill etc. Since it does not match the color, it is equipped with an opaque tail plug that displays the color of the writing line and a rubber grip that becomes the outer skin.

As a measure against writing for a long time, writing with a strong writing pressure, slippage due to sweat, etc., there is a writing implement shaft made of a soft material having a low rubber grip hardness, but the grip rubber may move from the barrel. There is also a problem that it is difficult to write because it rotates during writing unintentionally, but it is countered by detents etc., but the effect is not enough if the grip swells with sweat or oil during use Problems remain that are difficult to assemble. In the case of such a conventional rubber grip, the grip portion coincides with the vicinity of the remaining amount of ink consumed, and the visibility and the drawing line color display function cannot be simultaneously satisfied.

There has been proposed a method in which the barrel and the rubber grip are made transparent and a color is displayed with a tail plug. However, even in the case of a combination of materials having considerably high transparency, a light transmittance of 80% to 90% (JIS 3 mm thick) is required. AS, PS, PC, PM
There is an interface between the two parts, the required thickness of the barrel such as MA, the minimum thickness of a translucent rubber grip with a light transmittance of 80% or less with a matte surface as a non-slip surface. As a result, light is reflected, and the total light transmittance substantially drops to 60% or less, and it is hard to say that a clear ink color can be visually recognized.

[0005] In the case of a sharp pencil or a knock type shaft, there is also a demand to show the internal mechanism and the state in which a part with a name or a printed part is rotated or moved. In this case, the shaft is made thicker, a separate rubber made of expensive silicone rubber is inserted into the barrel, and the pen tip side is fastened with a base.

[0006] In addition, there have been proposed a device for solving some of these problems, such as Japanese Patent Publication No. 5-45509, Japanese Patent Application Laid-Open No. Sho 57-19397, and Japanese Patent Application Laid-Open No. 7-290876. In some cases, the finger grips the hard protruding part, making it difficult to achieve a soft anti-slip effect, or the rubber grip cannot be fixed by simple double (two color) molding, and the barrel and the outer shell are welded Only the material of the combination could be selected, and the outer shell with poor oil resistance and the material that was difficult to mold could not be used, and the requirements for visibility and appearance inside the shaft could not be satisfied.

[0007]

SUMMARY OF THE INVENTION An object of the present invention is to improve a shaft mainly used in a popular writing instrument, and to improve the visibility of appearance, the anti-slip property of a rubber grip, and the feel of a grip portion. An object of the present invention is to solve the problem of providing an inexpensive and high-performance writing instrument without requiring an advanced mechanism. There is also a problem of satisfying a demand for a writing instrument having a wide range of applications, such as a case where only the remaining amount of ink is required to be visually recognized without showing the rear side.

[0008]

Means for Solving the Problems The axis of the writing instrument of the present invention devised to solve the above-mentioned problem is the axis of a writing instrument having a built-in refill or writing mechanism which is a writing body inside. A first means for making the invention effective is a shaft cylinder formed by processing a synthetic resin molded or pipe-shaped metal shaft based on the shaft,
A part of the barrel has a through hole at the time of injection molding or drilling, while a part of the barrel is made of a synthetic resin whose outer part is near the outer surface. In this state, the grip portion or an outer shell integrally formed with the grip portion is formed so as to cover the through hole, and the shaft cylinder and the outer shell are strongly prevented from coming off and rotating. In the vicinity of the through hole, the inner diameter of the barrel and the inner diameter of the outer cover are substantially the same.

[0009] As a second means, the outer skin is provided with a light transmittance of 6%.
By using a transparent, translucent or colored transparent synthetic resin of 5% or more, the refill and the mechanism inside the shaft are configured to be visible through the outer skin of the through hole. At this time, the outer skin thickness T was set to 3 mm or less so that the thickness became too thick and the visibility did not deteriorate. The size of the through-hole was made larger than the thickness T of the through-hole in order to allow light to enter inside through the through-hole.

[0010] As a third means, the hardness of the outer skin is JIS.
-HsA 30 to 90 degree soft rubber-like elastomer (a variety of injection-moldable rubber-like elastic synthetic resins such as olefin, styrene, nylon, and PVC) that is rigid and has a higher hardness than the outer skin The outer diameter of at least a part of the cylinder was smaller than the maximum diameter of the outer skin. In other words, the outer skin is used as a rubber grip non-slip, and the vicinity of the through hole of the shaft can be softly deformed inward by the grip load due to the soft hardness. The above three means constitute a means for solving the problem of the present invention.

[0011]

According to the present invention, the above-described means have the following effects. The outer shell and the barrel are strong in the through-holes, preventing them from rotating and preventing them from moving in general use.In addition, the outer shell has oil resistance and elastic recovery properties. Even if it is made of a slightly weak elastomer material, it has a strong detachment preventing action such that detachment of the member due to lifting or deformation does not occur. Near the through hole, the barrel and outer shell are almost the same inner surface, so it can be assembled from either the front or rear of the shaft without being caught during operation or assembly of the refill inside the shaft or the internal mechanism of the mechanical pencil. In addition, there is no need to unnecessarily increase the outer diameter.

When the outer skin is made of a transparent resin, the remaining amount of ink and the internal mechanism can be visually recognized. Since the material has high transparency (transmittance of 65% or more), the internal ink color, internal mechanism characters and colors can be clearly recognized. In addition, by defining the thickness and size, unnecessary darkening and blurring are prevented. When the outer skin is made of a soft elastomer, the effect of the present invention is most exerted, and it is possible to provide a thin writing instrument having a good appearance without sacrificing the assemblability, durability, and cost as described above, and to provide long-term writing. The anti-slip effect when writing with high writing pressure in carbon copying and the effect of fitting are exhibited, and the through hole of the present invention is not only easy to give a soft fit because it is relatively thick rubber-like, The through-hole has an unprecedented effect in that the through-hole can be deformed into the interior by the pressure of the grip to provide a higher fit.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIGS. 1 and 2 show an example of a writing instrument shaft according to an embodiment of the present invention. The writing instrument according to the present invention includes a ballpoint pen, a mechanical pencil, a sign pen, a marker, and a correction fluid. However, an example of a refill-type ballpoint pen will be described below in detail with reference to the drawings.

A shaft of a writing instrument having a refill 4 serving as a writing body is formed by first forming a shaft cylinder 1 serving as a basic base by injection molding, and then forming a shell 2 serving as a second resin in a mold. A part was formed by so-called double molding (two-color molding, also called heterogeneous molding). Press for metal shaft,
Shaft tube 1 formed into a pipe shape by welding pipe, cutting, etc.
Is inserted into a mold to form the outer cover 2 by injection molding or rubber molding (referred to as insert molding).

The barrel 1 generally needs to have a certain degree of rigidity and hardness, and if there is a need to visually check the inside, a transparent resin is selected. Or a film (not shown). It is general to color the opaque resin such as the tail plug 6 to display the color of the ink. For the same reason, when a rubber grip is employed for the outer cover 2, the rubber grip is colored in ink.

According to the present invention, the outer shell 2 is formed in a state where the through-hole 3 is formed in a portion where the outer shell 2 is to be formed in the rigid barrel 1.
By molding such that the synthetic resin naturally flows into the through-hole 3 when it is molded, the outer shell 2 near the through-hole 3 of the barrel 1 is formed.
Has an inner diameter that is substantially the same as the inner diameter D of the filled portion. With such a configuration, the outer skin 2 is shifted,
The outer cover 2 is durable for a long time even with writing instruments that do not rotate and that can be used by changing the refill 4 many times.
Can be adopted with minimum thickness.

In addition to having no protrusions inside the barrel 1, it is possible to assemble the entire writing implement much more easily than by assembling the outer casing 2 as a separate body.
It is possible to make a difference in the color, hardness, and slipperiness (frictional force), and to select the most suitable material for the purpose.

When the outer cover 2 is transparent, the present invention employs a resin having a light transmittance of 65% or more. 6 transmittance
At 0% or less, the transmittance is further reduced by the satin finish on the surface even if the skin thickness T that can be formed by the writing instrument is as small as about 1 mm, and it is possible to confirm the remaining ink amount. Differences in color (difference between blue and dark blue, difference between green and dark green) were indistinguishable. Of course, even if the transmittance is high, when the thickness T is extremely increased, the visibility similarly deteriorates. Therefore, the thickness T is set to 3 mm or less.

Even if the transmittance and the thickness are specified, the through hole 3
If the size is too small, light does not enter the inside of the axis, and similarly visibility deteriorated.
By making at least one of the length L in the axial direction and the length B in the outer peripheral direction (minimum width in the case of an irregular shape) larger than the thickness T of the through hole 3 at least equivalently, it is possible to obtain knowledge that can be visually recognized without any problem. Was. The effect is even higher when both L and B are larger than T, or when a plurality of through holes 3 are arranged even if only one of them is provided.

When the outer skin 2 is made of a soft rubber-like elastomer, not only does it effectively prevent slipping, but also the periphery of the through hole 3 can be deformed by external pressure, so that a general double In addition to being able to form a thicker portion than the molded rubber grip outer skin, the through-hole portion 3 can be deformed inward, but is not extremely deformed or inadvertently deformed. It has elasticity. If the JIS Shore hardness is less than 30 degrees, it is too soft, and there is a problem in production and writing feeling. If the hardness is more than 90 degrees, the hardness is too high and the elastic feeling is lost.

Another application is a rigid barrel 1
Are metals such as stainless steel, brass and aluminum, PC, AB
Synthetic resins such as S, AS, PS, PP, PE and POM can be adopted, and the color is from transparent to opaque, with film,
Various combinations such as painting, printing, and combinations thereof are possible. The outer skin 2 is transparent, opaque as described above,
Various materials such as various hardness, presence or absence of coloration, various surfaces such as surface gloss and satin finish, and various shapes such as irregular shape, cylindrical shape, hexagonal shape, character shape, etc. can be selected as appropriate. An axis can be provided.

Further, the through hole 3 of the present invention has a round, irregular,
Any shape, such as character shape, can be adopted as appropriate, and if the gist of the invention is satisfied, there is no limitation on the mechanism of the writing instrument, the size of the shaft, the division of the front and rear shafts, with a base, the presence or absence of a tail plug, etc. Absent.

[0023]

According to the present invention, it is possible to provide a shaft having a wide range of applications which can meet almost all requirements of a writing instrument shaft. Specifically, the appearance of the color display, transparent cover-like outer skin, two-color pattern, thin shaft, etc., and the functions such as the rubber grip anti-slip, the advanced fit of the rubber grip, the ink color and the remaining amount can be seen, Rubber grip displacement and rotation prevention, slightly poor oil resistance (chemical resistance), but other functions do not require extra cost without deteriorating durability problems such as the use of excellent skin material. Therefore, an inexpensive writing instrument that can be used for a long time can be provided.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing the entire structure of a writing instrument having a shaft according to an embodiment of the present invention.

FIG. 2 is an external view showing an outer skin portion of a shaft according to an embodiment of the present invention.

[Explanation of symbols]

 1 Shaft cylinder 2 Outer shell (grip) 3 Through hole 4 Refill (cursive) 5 Cap T Thickness of outer skin through hole L Length of outer skin through hole B Minimum width of outer skin through hole D Shaft inner diameter (Near the through hole)

Claims (3)

[Claims] 1. A shaft of a writing tool having a refill or a writing mechanism as a writing body therein, and a synthetic resin having at least a part thereof protruding near the outer surface of the shaft cylinder as a base and the outside of the shaft cylinder. The outer shell of the shaft cylinder is double-molded, and a part of the shaft cylinder is formed so that the outer shell closes the through-hole in a state where there is a through-hole to the inside. A writing instrument shaft having substantially the same dimensions as the inner diameter of the through hole filling portion and not protruding inward. 2. The skin has a light transmittance of 65% or more (JIS,
3 mm thick) transparent, translucent, colored transparent synthetic resin. The outer skin thickness T is set to 3 mm or less so that the rifle and mechanism inside the shaft can be visually recognized through the outer skin of the through hole. Are larger in the axial direction L or in the outer circumferential direction B than in the radial thickness T (T> =
The writing instrument according to claim 1, wherein L or T> = B). 3. The outer skin is made of a soft rubber-like elastomer having a hardness of JIS-HsA of 30 to 90 degrees, and the outer skin can be deformed in the inner diameter direction of the shaft by gripping the vicinity of the outer skin through hole. Item 3. The ballpoint pen according to Item 1 or 2.