JPH0565585U - Ball pen - Google Patents

Abstract

(57) [Summary] [Structure] The inner hole 3 of the barrel 1 has a small-diameter portion 6 at the front. The inner step portion 7 which is the rear end of the small diameter portion 6 is formed in a taper shape which gradually expands toward the rear side.
A plurality of radial groove portions 9 opening to the large diameter portion 8 are formed in the inner step portion 7. [Effect] It is possible to make dirt of the ball-pen body less visible and further improve the aesthetic appearance of using a transparent barrel.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 A ball-point pen body with a ball-point pen tip attached to the tip of a pipe-shaped ink containing tube is positioned at an engaging portion in an axial cylinder having an inner hole with a small diameter portion at the front, and the tip is projected so as to project. The present invention relates to a ball pen housed in a shaft cylinder.

[0002]

[Prior Art]

 Conventionally, in the ball pen as described above, the rear end of the small diameter portion of the inner hole, which is the inner step of the shaft cylinder, is used as the engaging portion for the front end of the ink containing tube of the ball pen body, and the ball pen body is used. It is known to perform protruding positioning.

Forming the barrel of the ball-point pen from a transparent synthetic resin makes it possible to see the ink color and the remaining amount in the ball-point pen body, as well as to impart a high-class feeling and the like. -It is becoming more popular because it contributes to improving the aesthetics of rupen itself.

[0004]

[Problems to be solved by the device]

 The ball pen body in which the ball pen tip is attached to the tip of the ink containing tube of the ball pen described above is easily soiled by the ink contained therein. A ball-point pen that uses a transparent barrel also exposes dirt on the ball-pen body, so this transparent barrel-ball pen body combination is aesthetically unfavorable. Was there. In particular, ink or the like tends to adhere to the joint between the ink storage tube and the ball-point pen tip, and it often becomes dirty. However, from the idea of concealing the dirt in this part, if a transparent (or low) resin or metal apex is used for the transparent barrel, the advantages of the transparent barrel will be great. There was a problem that it would not be fully exhibited.

[0005]

[Means for Solving the Problems] A ball-point pen body, in which a ball-point pen tip is attached to the tip of a pipe-shaped ink containing tube, is provided at an engaging portion in a shaft cylinder having an inner hole having a small diameter portion at the front. A ball-point pen, which is positioned and housed in the barrel so as to project from the tip, wherein the rear end of the small-diameter portion of the inner hole, which is the inner step of the barrel, is the ink container of the ball-pen body. In the structure that forms the engaging portion with respect to the front end of the shaft cylinder, the shaft cylinder is formed of transparent synthetic resin, and a plurality of radial grooves that open to the large diameter part of the shaft cylinder inner hole are formed in the inner step portion. The ball pen is

[0006]

【Example】

 Embodiments shown in the drawings will be described below. Reference numeral 1 indicates a barrel, and reference numeral 2 indicates a ball pen body. The shaft cylinder 1 has an inner hole 3. The ball-point pen body 2 is composed of an ink storage tube 4 and a ball-point pen tip 5, and the ball-point pen tip 5 is housed in the inner hole 3 of the shaft cylinder 1 so as to project forward.

The shaft cylinder 1 is made of a transparent synthetic resin such as ABS resin, AS resin, polypropylene, polyethylene, and polyethylene terephthalate. As shown in FIG. 2, which is an enlarged view of the portion A of FIG. 1, the front portion of the inner hole 3 of the barrel 1 is a small diameter portion 6. The inner step portion 7 which is the rear end of the small diameter portion 6 is formed in a taper shape which gradually expands toward the rear side. A plurality of radial groove portions 9 opening to the large diameter portion 8 are formed in the inner step portion 7. When a radial groove is formed as shown in FIG. 3, which is a sectional view taken along the line I-I of FIG. 2, when the radial groove 9 is viewed from the outside of the barrel, light refraction and reflection occur in a complicated manner, and glittering occurs. It seems to shine.

The ink container tube 4 of the ball-pen body 2 is made of a transparent or semi-transparent synthetic resin such as ABS resin, AS resin, polypropylene, polyethylene, polyethylene terephthalate, and the ball-pen tip 5 is It is made of metal such as stainless steel and nickel silver. A rear side portion of the ball-point pen tip 5 having a ball-point pen tip at its tip is press-fitted and fixed to the tip opening 10 of the ink storage tube 4.

The rear end of the ball-point pen body 2 housed in the inner hole 3 of the shaft cylinder 1 is brought into contact with the tail plug 11 attached to the rear end of the shaft cylinder by an appropriate means such as screwing or press fitting, and the ink is stored. The front end portion 12 of the tube 4 contacts the inner step portion 7 formed in the inner hole 3 of the barrel 1. As a result, the ball-point pen body 2 is clamped and fixed by the inner step portion 7 of the barrel 1 and the tail plug 11.

Here, when the joint portion 13 of the ink pen 4 of the ball-pen body 2 and the ball-pen tip 5 is viewed from the outside of the barrel 1, the radial shape formed on the inner step portion 7 of the barrel 1. Since the light impinging on the groove 9 is refracted and reflected in a complicated manner, the joint 13 is difficult to see. Particularly, in the portion where the light is totally reflected, the joint portion 13 becomes very difficult to see. In addition, since the ball-point pen tip 5 is made of a metal having a glossy surface, it has a function of reflecting light like a mirror, and further makes it difficult to see dirt on the joint portion. The inner step portion 7 in which the radial groove portion 9 is formed is in the form of a taper that gradually expands toward the rear side, and the rear end of the ink storage tube 4 and the ball pen tip 5 is formed. Since the press-fitting portion 14 is also covered, even if the press-fitting portion 14 is dirty, the dirt is hard to see.

FIG. 4 shows another embodiment of the radial groove portion 9. FIG. 4 is a view corresponding to FIG. 3 of the above embodiment. In the embodiment of FIG. 4, the radial groove portion 9 does not have a bottom surface as in the example of FIG. 3, but has a V-shaped cross section. Here, as described above, the cross-sectional shape of the groove portion 9 can be an arc shape, a parabola shape, or the like as appropriate. Further, the groove portion 9 may be formed as a valley between a plurality of protrusions, and in this case, the protrusions may have any shape such as columnar, conical or hemispherical. ..

Besides the above, various modifications can be made without departing from the gist of the present invention. Although the ball-pen body 2 is shown to be prevented from moving backward by the tail plug attached to the rear end of the shaft cylinder 1, the ball pen body 2 has a bottom and the bottom part prevents the backward movement. It is also possible to form an inward protruding portion at the rear portion of the inner hole 3 of the shaft cylinder 1 and prevent the backward movement by the inward protruding portion. The barrel may be composed of two members, a front part and a rear part, or may have a cap that protects the ball pen tip part. The ink accommodated in the ink accommodating tube 4 may be water-based ink or oil-based ink, and the physical properties such as viscosity may be those used in the ball-point pen.

[0013]

[Effect of the device]

 As described above, according to the ball-point pen of the present invention, the ball-point pen body in which the ball-point pen tip is attached to the tip of the pipe-shaped ink-accommodating tube is provided in the shaft cylinder having the inner hole with the front part having a small diameter part. A ball-point pen which is positioned in the joint part and is housed in the barrel so that the tip of the ball-pen body is fitted to the rear end of the small-diameter part of the inner hole which is the inner step of the barrel. In the portion that forms the engagement portion with respect to the front end of the ink containing tube, the shaft cylinder is formed of transparent synthetic resin, and a plurality of radial grooves open to the large diameter part of the shaft cylinder inner hole is formed in the inner step portion. Therefore, the dirt of the ball-pen body is made hard to see, and the aesthetics of using the transparent barrel are further improved.

[Brief description of drawings]

FIG. 1 is a sectional view of a first embodiment of the present invention.

FIG. 2 is an enlarged view of part A of FIG.

3 is a cross-sectional view taken along the line I-I of FIG.

FIG. 4 is a view corresponding to FIG. 3 of the second embodiment of the present invention.

[Explanation of symbols]

 1 Shaft cylinder 2 Ball pen body 3 Inner hole 4 Ink storage tube 5 Ball pen tip 6 Small diameter part 7 Inner step part 8 Large diameter part 9 Groove part 10 Opening part 11 Tail plug 12 Front end part 13 Joining part 14 Press fitting part

Claims (1)

[Scope of utility model registration request] 1. A ball-pen body in which a ball-pen tip is attached to the tip of a pipe-shaped ink containing tube is positioned by an engaging portion in a barrel having an inner hole having a small diameter portion at the front,
In a ball-point pen that is housed in the barrel so as to project at the tip, the rear end of the small-diameter portion of the inner hole that is the inner step of the barrel is positioned with respect to the front end of the ink container tube of the ball-pen body. In the engagement portion, the barrel is formed of a transparent synthetic resin, and a plurality of radial grooves open to the large diameter portion of the bore of the barrel are formed in the inner step portion. Rupen.