JPH0939466A - Grip part structure of writing utensil - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the damage to projections by preventing the mutual contact of the projections, in a structure wherein projections composed of a synthetic resin are formed to the side part of a shaft cylinder, by forming recessed parts to the side part of the shaft cylinder and forming a plurality of projections to each of these recessed parts and setting the height of the projections to the depth of the recessed parts or less. SOLUTION: In a writing utensil wherein a refill having the pen point of a ball-point pen provided to the leading end thereof and housing ink therein is attached to the inside of a molded product of a transparent synthetic resin in such a state that the pen point is protruded from the tip metal provided to the leading end of the shaft cylinder, recessed parts 5 are formed to the side part of the shaft cylinder 1 to constitute a grip part. A plurality of projections 6 composed of a synthetic resin such as a urethane resin, an epoxy resin or a polyester resin are regularly arranged to be attached to each of the recessed parts 5. The height of the projections 6 is set to the depth of the recessed parts 5 or less and the distance between the projections 6 is set to about 10-200 times the height of the projections 6 from an aspect of anti-slip effect and gripping stability.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gripping portion structure of a writing instrument in which a protrusion having a synthetic resin as a base material is attached to a side portion of a barrel.

[0002]

2. Description of the Related Art Conventionally, there is known a shaft cylinder having a plurality of protrusions attached to the side portions thereof. It is known that these protrusions are formed by attaching a liquid material at a predetermined position by a screen printing method or the like.

[0003]

However, in the case of the above-mentioned thing, it is in a state of being fixed mainly by the adhesiveness of the material itself of the projection which becomes the grip portion. That is, some elasticity and softness are required to function as a gripping part in the first place, but the fixing of the protrusion depends on the adhesiveness of the material itself. Therefore, it may come off when a strong force is applied. Further, it is possible to use an adhesive or the like to make the fixation strong, but there is a problem that it may be broken and removed due to the elasticity and softness of the material itself. In particular, in the case where a transparent synthetic resin is used as the shaft cylinder for attaching the protrusion, it is preferable to make the surface smooth for the visibility of the ink remaining amount and the ink color accommodated in the shaft cylinder, With such a structure, there is a problem that the protrusions are more likely to be peeled off. In addition, during transportation, a plurality of writing instruments will be arranged and vibration will be given, and the protrusions formed at the same position of the plurality of writing instruments will collide with each other, rubbing, and the protrusions may be peeled off or damaged. It was.

[0004]

SUMMARY OF THE INVENTION That is, the present invention provides a transparent synthetic resin containing ink in a grip portion structure of a writing instrument in which a protrusion having a synthetic resin as a base material is attached to a side portion of a shaft cylinder. A gist structure of a writing instrument is characterized in that a concave portion is formed on a side portion of a shaft cylinder, and a plurality of the protrusions are formed in the concave portion, and a height of the protrusion is equal to or less than a depth of the concave portion. .

[0005]

The gripping portion structure of the writing instrument of the present invention suppresses a strong impact or the like as much as possible by preventing contact with anything other than the gripping hand. Further, even when vibration is applied in a plurality of springs during transportation, the projections are prevented from coming into contact with each other, and the projections are prevented from being peeled off or damaged as much as possible.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An example will be described below with reference to the drawings.
What is shown in FIG. 1 is an example of a writing instrument using the grip portion structure of the present invention. A refill (not shown) having a pen tip 2 of a ballpoint pen at the tip and a refill (not shown) inside the shaft cylinder 1 as an injection molded product of a transparent synthetic resin such as AS resin, ABS resin and PET resin. The nib 2 is installed so as to project from the tip opening of the tip 3 attached to the tip of the pen 1. A tail plug 4 is attached to the rear end of the barrel 1 so that the rear end of the refill is fixed by an inner hole of the tail plug (not shown).

As shown in FIG. 2, which is an enlarged view of portion I in FIG. 1, a recess 5 is formed in the side portion of the barrel 1. The concave portion 5 serves as a so-called grip portion that is mainly gripped during writing. The grip portion is formed in a range of 150 mm to 700 mm from the tip of the pen tip, but can sufficiently exert the function as a portion gripped during writing, but may be set over the entire side portion of the barrel 1. Urethane resin, epoxy resin,
A plurality of protrusions 6 having a synthetic resin such as polyester resin as a base material are regularly arranged and attached. It is not necessary to arrange them regularly, but since a transparent barrel is used for the visibility of the remaining ink amount and ink color, at least one place is formed with protrusions 6 continuously in the longitudinal direction. It is preferable to provide the window portion 7 which is a non-shielded portion.

FIG. 3 and FIG. 2 in which the II portion of FIG. 2 is further enlarged.
As shown in FIG. 4, which is an enlarged cross-sectional view of the portion III, the protrusion 6 has a substantially elliptical bottom surface and an arc-shaped ridge line. Bottom is a portion to be in contact with the side wall of the barrel 1 fixed, 1.5 mm ² 2.5 mm ² approximately from the viewpoint of peeling difficulty and strength can be said to be preferable. The height of the protrusions 6 is preferably about 30 to 70 μm in consideration of strength and stability when gripped, and more preferably 1 to 2% of the longest straight line that can be drawn on the bottom surface. Further, the distance between the protrusions is preferably about 10 to 200 times the height of the protrusions 6 in terms of the anti-slip effect and the stability when gripped. By setting the distance between the protrusions in this way, the hand comes into contact with the recesses 5 of the shaft cylinder 1 together with the protrusions 6 when gripping the writing tool during writing. The concave portion 5 is a portion having a smooth surface state for the visibility of the ink in the barrel 1, and in combination with the anti-slip effect of the protrusion 6, it is a portion where a feeling of close contact with a finger can be obtained. In this way, since the projection 6 as the slip stopper and the concave portion 5 which is the smooth portion are combined, the position of the finger is fixed and the concave portion 5 which is the smooth portion provides the adhesion effect.

Another example of the shape of the protrusion 6 is shown in FIG. If the left and right ends of the protrusion 6 are wide portions, the protrusion 6 can be more reliably prevented from peeling off. The height of this portion of the protrusion 6 is set to be slightly lower than the other portions.

[0010]

The grip portion structure of the writing instrument of the present invention is intended to suppress the protrusion as a grip portion from being peeled off or damaged.

[Brief description of drawings]

FIG. 1 is an external view showing an embodiment.

FIG. 2 is an enlarged external view of a main part of FIG.

FIG. 3 is an enlarged external view of a main part of FIG.

FIG. 4 is an enlarged sectional view of a main part of FIG. 2;

FIG. 5 is a view corresponding to FIG. 3 without showing another embodiment.

[Explanation of symbols]

 1 Shaft cylinder 2 Pen tip 3 Tip metal 4 Tail plug 5 Recess 6 Protrusion 7 Window

Claims (1)

[Claims] 1. A grip portion structure of a writing instrument, wherein a protrusion made of synthetic resin as a base material is attached to a side portion of a shaft cylinder, and a recess is provided in a side portion of a shaft cylinder made of a transparent synthetic resin for containing ink therein. A gripping portion structure for a writing instrument, wherein a plurality of protrusions are formed in the recess and the height of the protrusion is less than or equal to the depth of the recess.