JP4625555B2 - Writing instrument shaft - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a shaft tube of a writing instrument such as a ballpoint pen or a mechanical pencil.
[0002]
[Prior art]
Recently, purchasers such as ballpoint pens and mechanical pencils have an anti-slip effect when gripping and writing on the shaft tube, and a good feel when gripping the shaft tube can be obtained. There is a fact that they prefer to purchase a grip with a grip on the tube.
[0003]
[Problems to be solved by the invention]
The shaft cylinder with the grip attached to the gripping part is formed by two-color molding of the shaft cylinder and the grip, or the shaft cylinder is formed, and then a rubber elastic body grip is inserted into the gripping part of the shaft cylinder in a later process. obtain. The former requires a two-color molding machine, and the latter requires an apparatus, jig, and process for mounting the grip on the gripping portion of the shaft cylinder, and its manufacturing cost is not low. For low-priced ballpoint pens and the like whose price is less than 100 yen, there is a real problem that it is difficult in terms of manufacturing cost to provide a grip with a grip on the shaft tube.
[0004]
Even if a grip is not attached to the gripping part of the shaft tube, it is possible to obtain the action and effect as an anti-slip by forming a concave groove etc. for the anti-slip in the gripping part. For those who intend to purchase a writing instrument such as a pencil, there is a real problem that a gripping part with a grip is preferred. In view of these actual problems, the present inventors have conceived of obtaining a writing tool shaft that does not actually have a grip attached to the gripping portion of the shaft, but looks as if the grip is attached. Invented.
[0005]
[Means for Solving the Problems]
The shaft cylinder of the writing instrument of the present invention has an outer shape of the grip portion formed integrally with the shaft cylinder behind the tapered tip portion, and has a larger diameter than the outer diameter of the other part of the shaft cylinder, on the surface. grooves for slip and / or the recess provided for the finger contact, performs a satin finish only on the entire surface facing outwardly of the grip portion.
[0006]
Further, the shaft tube is a transparent shaft, and the gripping portion is made translucent by a satin finish.
[0007]
DETAILED DESCRIPTION OF THE INVENTION
In the present invention, a gripping portion of a shaft cylinder is formed integrally with a portion of another shaft cylinder behind a tapered tip portion, and an outer shape of the other portion of the shaft cylinder is formed as an outer shape of the gripping portion. In order to form a larger diameter and make it appear as if a grip is attached, as seen on many grips, the surface of the gripping part has a non-slip groove or / and finger contact providing a recess is subjected to satin finish only on the entire surface facing outwardly of the grip portion.
[0008]
The outer shape of the gripping part is formed in the shape as described above, and the surface of the gripping part is subjected to a satin finish, so that the color of the surface of the gripping part becomes less glossy than the color of the surface of the other part of the shaft tube, Gives a feeling of material that is different from the other parts of the tube, giving it the impression of wearing a grip. If the shaft tube is of a transparent shaft, the entire surface facing the outside of the gripping part becomes translucent due to the satin finish, so that a grip made of a semi-transparent thermoplastic material is further attached to the gripping part. looks like.
[0009]
The shaft tube in the present invention may be divided into a front shaft and a rear shaft having a gripping portion, and the front shaft and the rear shaft may be formed as one shaft tube by screw fitting or the like, or like a pencil type. Further, it may be integrally formed from the front end to the rear end.
[0010]
【Example】
Embodiments of the present invention will be described with reference to the drawings. In this embodiment, the shaft cylinder of the ballpoint pen will be described, but the present invention is not limited to this. The shaft 1 of the ballpoint pen is made transparent, the gripping part 2 has a larger diameter than the other part as when the grip is attached, and the tip part 3 in front of the gripping part 2 is tapered. It is formed in the shape.
[0011]
As shown in FIG. 3, ring-shaped concave grooves 4 for slip prevention are arranged in a direction along the axis on the surface of the grip portion 2, and the entire surface facing outwards is satin-finished. 5 is given. Accordingly, the surface of the grip portion 2 becomes translucent, and combined with the transparency of the other part of the shaft tube 1 gives the impression that the grip is attached to the grip portion 2.
[0012]
The ballpoint pen 6 using the shaft tube 1 of the present embodiment has a tail plug 8 fixed to the rear end portion 7 by screw fitting or the like, and the tail plug 8 is removed from the rear end portion 7 of the shaft tube 1 and the rear end portion. 7, the ballpoint pen feel 9 is attached to and detached from the shaft cylinder 1.
[0013]
【The invention's effect】
Since the shaft cylinder of the writing instrument of the present invention is configured as described above, it gives an impression as if the grip is attached to the gripping portion of the shaft cylinder, so that the appeal to the purchaser who wants to purchase the writing instrument becomes large. . In addition, since the grip portion is processed with a satin finish, there is also an action / effect as a slip stopper. In production, it does not require a special injection molding machine or equipment, jigs and processes for mounting the grip to the gripping part of the shaft tube, and it can be easily manufactured in large numbers by injection molding, so its manufacturing cost is low, It can also be used for a low-priced writing instrument shaft.
[Brief description of the drawings]
FIG. 1 is a side view of a ballpoint pen using a shaft tube according to an embodiment of the present invention.
FIG. 2 is a longitudinal sectional view of the ballpoint pen of FIG.
FIG. 3 is an enlarged view of a grip portion in FIG. 1;
[Description of the code]
1 Shaft cylinder 2 Gripping part 4 Groove 5 Finishing process

Claims (2)

The outer shape of the gripping part formed integrally with the shaft cylinder behind the tapered tip is made larger than the outer diameter of the other part of the shaft cylinder, and a non-slip groove or / and on the surface An axial tube for a writing instrument, wherein a hollow for finger contact is provided, and a satin finish is applied only to the entire surface of the grip portion facing outward . The shaft tube of the writing instrument according to claim 1, wherein the shaft tube is a transparent shaft, and the gripping portion is made translucent by a satin finish.

Images