JP2003054180A - Writing implement - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To provide a writing implement that does not bother tactilely or visually with the presence of a gate mark of a gripping member. SOLUTION: In a writing instrument in which an outer surface of a barrel is coated with a gripping member made of an elastic resin by injection molding, a shaft trace is formed on a front end edge of the gripping member at the time of injection molding the gripping member. To the outer surface. further,
A front edge of the holding member covers a tapered portion formed in front of the writing instrument.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a writing instrument in which a grip member made of an elastic resin is coated on the outer surface of a barrel by injection molding.

[0002]

2. Description of the Related Art It has been well known that the outer surface of a barrel is covered with a gripping member made of an elastic resin such as silicone rubber or elastomer so that a writing instrument can be easily gripped. Further, recently, from the viewpoint of excellent workability, a method of fixing the gripping member to the shaft cylinder by two-color molding or insert molding that does not require bonding or press fitting has been used.

Incidentally, in the two-color molding or insert molding, there is a step of injecting an elastic resin serving as a holding member into a gap between the inner surface of the mold and the outer surface of the barrel. In addition, in these molding methods,
A gate for pouring the elastic resin into the inner surface of the mold is set on the side surface of the grip member.

[0004]

For example, as shown in FIG. 5, the gate mark 108 of the gripping member 106 covering the outer surface of the barrel 102 is formed on the side surface 106a which is easily touched by a finger holding the gripping member 106. As a result, there is a problem that the writer feels uncomfortable and the broken portion of the gate mark 108 is uneven, and dirt easily accumulates and it looks bad.

SUMMARY OF THE INVENTION In order to solve these problems, an object of the present invention is to provide a writing instrument in which the presence of a gate mark on a holding member is not bothered by touch and visually.

[0006]

Next, the writing instrument of the present invention devised to solve the above problems will be described. “1. In a writing instrument in which a grip member made of an elastic resin is coated on the outer surface of a shaft cylinder by injection molding, the shaft mark of the shaft cylinder is formed so that a gate mark at the time of injection molding the grip member is formed on the front end edge of the grip member. 2. The outer surface is covered 2. The front edge of the grip member covers a tapered portion formed in front of the writing instrument.

In the present invention, the outer surface of the barrel is covered with the grip member so that the gate mark is formed on the front edge of the grip member during injection molding. Since it is positioned, the writing feeling is good, and even if the gate part is slightly separated during injection molding, the gate mark is formed at a partly inconspicuous place at the edge of the member, so it is visually problematic. It is difficult to become. Further, even if the broken portion of the gate mark is contaminated with dirt, it is in a position where it is difficult for the finger to come into contact with the gate mark, so that the user does not feel uncomfortable.

Further, the front end edge of the grip member covers the tapered portion formed in front of the writing instrument so that the front end edge is further moved to the front side, and it is more difficult for the finger to come into contact with it, and dirt due to hand marks is also prevented. Because you can do it. Also,
By moving the front edge away, for example, even if there is a habit of holding the writing instrument forward, the effect of the present invention can be obtained by forming the gate trace particularly forward.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION Next, in order to facilitate understanding of the present invention, description will be given with reference to the drawings. In the present embodiment, a ballpoint pen will be used as the writing instrument for explanation.
The present invention is not limited to ballpoint pens, but can be used in various types of writing instruments such as fountain pens and mechanical pencils. In the present invention, the side of the ballpoint pen tip is expressed as the front side and the opposite side is expressed as the rear side.

FIG. 1 is a side view of a ball-point pen showing a first embodiment. As shown in FIG. 1, a ballpoint pen 1
Includes a tapered portion 3 in front of the barrel 2, and the tapered portion 3
A ball-point pen tip 4 which is a writing portion is projected from the tip of the to enable writing. The ball-point pen tip 4 can be retracted and retracted by knocking a knock body 5 arranged behind the barrel 2.

Further, the ball-point pen 1 is provided with a grip member 6 at a position rearward of the tapered portion 3. The gripping member 6 is made of an elastomer, which is an elastic resin, so that the writing instrument 1 can be easily gripped. In the present embodiment, the shaft cylinder 2 and the grip member 6 are molded by two-color molding, and the grip member 6 is injection-molded so that the outer surface of the shaft cylinder 2 is covered after the shaft cylinder 2 is injection molded. It is formed by molding. A gate mark 8 at the time of injection molding is formed on the front edge 7 of the grip member 6.

FIG. 2 is a perspective view showing a usage state of the first embodiment. As shown in FIG. 2, when writing is performed by gripping the grip member 6 with fingers, the gate mark 8 is formed on the front end edge 7 of the grip member 6, so that the gate mark 8 is less likely to contact the finger during writing. became.

FIG. 3 is a side view of the ball-point pen showing the second embodiment. In FIG. 3, the front edge 7 of the grip member 6 is
a covers the rear portion 3a of the tapered portion 3 of the barrel 2. The other points are the same as those of the above-described embodiment, and the description thereof is omitted.

FIG. 4 is a perspective view showing a usage state of the second embodiment. As shown in FIG. 4, when the user grasps the gripping member 6 with his / her finger and writes, a gate mark 8 is formed on the front end edge 7a of the gripping member 6, and the front end edge 7a is behind the tapered portion 3. By covering up to part 3a,
The front edge 7a is moved further forward, and the gate mark 8 is less likely to contact the finger during writing.

[0015]

As described above, according to the present invention, since the gate mark is in a position where it is difficult to contact the finger holding the writing instrument, the feeling of writing is tactilely improved, and the feeling of writing is slightly rough during injection molding. Even if the gate portion was broken, the gate traces were formed in a partly inconspicuous location, which was the edge of the member, so it became less of a visual problem. Further, the front end edge of the gripping member covers the tapered portion formed in front of the writing instrument, so that the front end edge moves further forward, that is, the gate trace also moves further forward, and it is more difficult for the finger to contact. It became a thing.

[Brief description of drawings]

FIG. 1 is a side view of a ball-point pen showing a first embodiment example.

FIG. 2 is a perspective view showing a usage state of the first embodiment.

FIG. 3 is a side view of a ball-point pen showing a second embodiment example.

FIG. 4 is a perspective view showing a usage state of a second embodiment example.

FIG. 5 is a side view of a writing instrument having a conventional structure.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Ball-point pen, 2 ... Shaft cylinder, 3 ... Tapered part, 4 ... Ball-point pen tip, 5 ... Knock body, 6 ... Gripping member, 7, 7a
… Front edge, 8… Gate mark.

Claims (2)

[Claims] 1. A writing instrument having an outer surface of a shaft cylinder covered with a gripping member made of an elastic resin by injection molding, wherein a shaft of the gripping member is formed so that a gate mark at the time of injection molding the gripping member is formed at a front end edge of the gripping member. A writing instrument characterized in that the outer surface of a cylinder is covered. 2. The writing instrument according to claim 1, wherein a front end edge of the grip member covers a tapered portion formed in front of the writing instrument.