JP2000168287A - Barrel cylinder for writing utensil - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the change of a color with time by constituting an elastically deformable grip member which is arranged at the gripping section, of two kinds of elastic bodies of which the colors are different, and preferably, of which the temperatures for complete melting are different, and arranging one of them into a marble-state. SOLUTION: For a writing utensil 1, a grip member 4 is arranged at the gripping section 3 of a barrel cylinder 2. Then, the grip member 4 is constituted of two kinds of elastic bodies, an elastic body 4a, and an elastic body 4b wherein the temperature for the complete melting is higher than that of the elastic body 4a, and in addition the color is different from that of the elastic body 4a. When an injection molding is performed using the mixed material of the elastic bodies 4a and 4b, the resin temperature is set higher than the temperature by which the elastic body 4a completely melts, and lower than the temperature by which the elastic body 4b completely melts. Since the elastic body 4b does not completely melt, the elastic body 4b is arranged in the elastic body 4a under a marble-state. By this constitution, the change of the hue with time becomes less.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a writing instrument barrel in which a grip member is provided with an elastically deformable grip member.

[0002]

2. Description of the Related Art Conventionally, there has been known an arrangement in which a grip member formed of an elastic body which can be elastically deformed is disposed on a grip portion in order to prevent slippage when the grip portion of the barrel is gripped.

[0003] However, if a writing instrument composed of a shaft cylinder having a grip member provided on a grip portion is inserted and displayed in a display container or the like, dust or the like adheres to the grip member, and the grip member becomes dirty or the grip portion becomes dirty. There is a problem that hand grit and the like accumulate and become dirty when actually held by hand. For this reason, there has been such a problem that the color becomes dull with the passage of time, the original color tone is lost, and the external appearance is spoiled.

[0004]

[Problems to be solved by the invention]

The present invention has been made in view of the above problems, and has as its object to provide a writing instrument barrel having a grip member made of an elastic material and having little change in color over time.

[0006]

In order to achieve the above object, according to the present invention, there is provided a writing instrument barrel having a grip portion provided with an elastically deformable grip member, wherein the grip member has a different color. It is composed of two types of elastic bodies, and one of the elastic bodies is arranged in a marble shape.

Further, the two types of elastic bodies have different melting temperatures.

[0008] Further, at least one of the elastic bodies may include:
This uses a thermoplastic elastomer.

Further, the grip member is provided by two-color molding.

[0010] Further, colors different in brightness and / or saturation are used for the two kinds of elastic bodies.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION A first elastic body, which is a grip member disposed on a grip portion of a barrel of a writing instrument such as a ballpoint pen, a mechanical pencil or a marking pen, and an amount corresponding to the first elastic body, In addition, two kinds of elastic bodies, which are higher in temperature for completely dissolving than the first elastic body and have different colors, are mixed. Using the mixed material, a grip member is injection-molded by an injection molding machine, and the grip member is disposed on a grip portion of the barrel of the writing implement to obtain a barrel of the writing implement of the present invention.

At this time, the resin temperature of the injection molding is set higher than the temperature at which the first elastic body is completely melted and lower than the temperature at which the second elastic body is completely melted. As a result, since the second elastic body does not completely melt, the first elastic body and the second elastic body do not completely fuse. Therefore, after the injection molding, the second elastic body is arranged in a marble shape on the first elastic body.

In this embodiment, two kinds of elastic bodies having completely different melting temperatures are used for the grip member for the sake of convenience. It is only necessary that one of the elastic bodies is arranged in a marble shape. For example, two kinds of elastic bodies that are not completely fused when melted and mixed, or one of the elastic bodies is previously arranged on the shaft cylinder. After that, there is no particular limitation such as disposing the other elastic body in a marble shape.

With respect to the blending amount of the two kinds of elastic bodies, the blending amount of the grip member is appropriately determined in accordance with the amount of the second elastic body arranged in a marble shape.

Since the marble pattern is exposed in appearance by disposing the second elastic body in a marble shape on the grip member, even if dust or the like adheres and becomes dirty, regularity can be obtained. Since the hue is changed in advance by no marble pattern, the dirt is not noticeable because only the dirt does not stand out.

More preferably, the first or second elastic body uses a color having lower brightness and / or saturation than the second or first elastic body. For example, since one of the elastic bodies such as gray and black or light blue and blue is used in advance with a color having low brightness and / or saturation, even if the color is dull, dirt is hardly conspicuous.

The elastic material of the present invention includes an elastically deformable elastomer (styrene, olefin, ester, nitrile, urethane, butadiene, vinyl chloride, etc.), natural rubber, silicone rubber, urethane. A generally known elastic body such as rubber and other synthetic rubbers may be appropriately selected, but preferably, a thermoplastic elastomer (polystyrene, polystyrene, or the like) is used in consideration of moldability, dimensional stability, cost, and the like. A generally known thermoplastic elastomer such as polyolefin, polyurethane, polyamide, or polyester is used.

In the case where the grip member is provided on the shaft cylinder by two-color molding, the grip member is not easily replaced with a new grip member because the grip member is dirty. Prevention measures are more important.

[0019]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described. In the present embodiment, the barrel 1 of a knock-type ballpoint pen will be described for convenience, but the present invention is not limited to these embodiments.

Shaft barrel 1 of knock type ballpoint pen of this embodiment
First, the transparent barrel body 2 is molded from acrylonitrile styrene resin (AS resin). Gripping part 3 of barrel body 2
Has a small outer diameter. The grip member 4 is provided with two grip members 4 arranged in a black marble on a blue substrate.
The grip member 4 is made of a butadiene elastomer manufactured by Nippon Synthetic Rubber Co., Ltd. (trade name: JSR RB (color: blue)), and the second elastic body 4b is made of AES Japan. Using a mixed material containing 20% by weight of Santoprene (color: black), which is an olefin-based elastomer manufactured by Co., Ltd., the molding temperature was adjusted to the first elastic body 4a completely melted, Elastic body 4
Two-color molding is performed at 150 ° C., which is a temperature at which b does not completely melt. The surface of the grip member 4 is provided with a non-slip groove 5 formed in a ring shape.

[0021]

According to the present invention having the above-described structure, it is possible to provide a shaft barrel of a writing implement provided with a grip member made of an elastic body and having a small change in color over time.

Further, since a marble pattern can be provided on the grip member, the design width of the grip member can be expanded.

[Brief description of the drawings]

FIG. 1 is a diagram showing a main part of a writing instrument with a partial cross section, showing a first embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Writing implement 2 Shaft cylinder 3 Grasping part 4 Non-slip member 4a First elastic body 4b Second elastic body 5 Recess

Claims (5)

[Claims] An object of the present invention is to provide a shaft barrel of a writing instrument in which a gripping member is provided with an elastically deformable gripping member, wherein the gripping member is composed of two kinds of elastic bodies having different colors. A shaft barrel for a writing instrument, wherein the elastic body is arranged in a marble shape. 2. The shaft cylinder of a writing instrument according to claim 1, wherein the two kinds of elastic bodies have different melting temperatures. 3. The shaft cylinder of a writing instrument according to claim 1, wherein a thermoplastic elastomer is used as at least one of the elastic bodies. 4. The shaft cylinder of a writing instrument according to claim 1, wherein said grip member is provided by two-color molding. 5. A writing instrument barrel according to claim 1, wherein said two kinds of elastic bodies have different brightness and / or saturation.