JP2002011989A - Ball-point pen refill - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a ball-point pen refill with outstanding gas barrier properties which prevent is ink from leaking from a fitted part between an ink storage pipe and a ball-point pen tip, a tip holder or a tail plug and imparts a sophisticated appearance. SOLUTION: In the ball-point pen refill consisting of the ink storage pipe with is made of a resin and directly filled with ink for a ball-point pen and the ball-point pen tip embracing a ball in a freely rotating manner, arranged directly or through the tip holder at the tip of the ink storage pipe, a metallic member is arranged so that at least a part of the outer periphery of the ink storage pipe is covered.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a ballpoint pen refill provided with a ballpoint pen tip which rotatably holds a ball.

[0002]

2. Description of the Related Art A conventional ball-point pen refill is one in which a ball-point pen tip which rotatably holds a ball is disposed directly or via a chip holder at an end of an ink storage tube made of resin or metal. Are known.
Also, a ballpoint pen refill in which ink is directly stored in the ballpoint pen refill is well known.

[0003] In a ball-point pen refill filled directly with ink, a tail plug is fitted in a fitting portion between an ink containing tube and a ball-point pen tip or a chip holder, or a tail plug is fitted in an ink containing tube. It is necessary to strictly set the dimensional relationship between the ink storage tube and the fitting portion of the ball-point pen tip or chip holder or the tail plug so that ink does not leak from the portion. In particular, in the case of a low-viscosity ink or an ink provided with a shear thinning property, the above-mentioned ink leakage appears remarkably.

As described above, resin or metal ball-point refills are well known. However, resin is easier to control the dimensions of the ball-point pen refill. It is easily understood by those skilled in the art that a combination of a resin and a metal, more preferably a combination of a resin and a resin is better than a metal and a metal to form a sealed state by press-fitting. In addition, when gas barrier properties are taken into consideration, metal is superior to resin.

[0005]

However, in the case of a ballpoint pen refill made of resin, it is easy to form a sealed state as described above, but it is not possible to obtain a high-quality appearance in comparison with metal. Is also a fact. In addition, metal ballpoint pen refills provide a high-quality appearance,
As described above, there is a problem that dimensional control is difficult, and it is difficult to form a more complicated shape.

In some cases, a film is transferred to a resin ink storage tube or printed to create a high-quality appearance, but in film transfer or printing, the gloss and solid feeling unique to metal are created. Has not yet been obtained. In addition, the above method is inferior in gas barrier properties as compared with metals.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-described circumstances, and it is intended to prevent ink leakage from a fitting portion such as an ink storage tube and a ballpoint pen tip, a chip holder or a tail plug, and to obtain a high-quality appearance. The present invention provides a ballpoint pen refill having excellent gas barrier properties.

[0008]

According to the present invention, a ball-point pen tip having a ball rotatably held directly or via a tip holder is provided at the tip of an ink container tube made of resin and directly filled with ink for a ball-point pen. In the ball-point pen refill, the outer periphery of the ink storage tube is covered with a metal member.

[0009] Further, the ink container tube made of resin is transparent or translucent, and a window is formed in the metal member for checking the remaining amount of ink.

[0010] Further, the ball-point pen tip is disposed on the ink storage tube via a chip holder, and a tail plug is attached to the rear end of the ink storage tube. A flange having an outer diameter larger than the diameter is formed, and the metal member is disposed between the flange of the tip holder and the flange of the tail plug.

Further, in the ink container, a tip holder and / or a tail plug made of resin is attached to a projection formed on the tip holder and / or the tail plug in an opening of a metal member, and the projection is formed on the projection. The formed protrusion is attached to the front end and / or the rear end opening of the ink storage tube.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION In the present invention, a PET resin, PE resin, PP resin, POM resin, A
A generally known resin material such as S resin can be appropriately selected and used. Also in the case of a structure having a tail plug and a tip holder, similarly to the ink storage tube, a generally known resin material can be appropriately selected and used. Also, the metal members are stainless steel, brass, aluminum, etc.
It can be appropriately selected and used. Further, the present invention is characterized in that the outer periphery of the ink storage tube is coated with a metal member, but the coating of the present invention may be provided with a close contact or a gap in the ink storage tube, and the metal member is also a kind. Without limitation, several types or a plurality of metal members may be connected and coated. It goes without saying that the gas barrier property is improved by coating with a metal, as compared with the case where only the resin ink tube is used.

The ink directly filled in the ink container can be used without any particular limitation, such as aqueous ink, oil-based ink, and ink having shear-thinning viscosity. The use of ink is particularly effective because the ink easily leaks from the fitting portion.

[0014]

Embodiments of the present invention will be described with reference to the drawings.
In the drawings, the same reference numerals are given to the same members and the same portions. Example 1 A ball-point pen refill 1 of the present invention shown in FIG. 1 is a grease that follows the ink 3 and a rear end of the ink 3 provided with a shear-thinning viscosity in a transparent ink container 2 made of a PP resin as the ink is consumed. The ink follower 4 is directly filled, and the tip opening 2a of the ink storage tube 2 is press-fitted with a projection 5b projecting toward the rear end opening 2b of the ink storage tube of the chip holder 5 made of POM resin. The ball-point pen tip 6 that holds the ball 7 in a rotatable manner is press-fitted into the tip opening of the tip holder 5. The rear end opening 2b of the ink storage tube has a projection 8 of a tail plug 8 made of PE resin.
b is press-fitted. The flange 5a of the tip holder and the flange 8a of the tail plug are set to be larger than the outer diameter of the ink storage tube 2, and the outer periphery of the ink storage tube 2 is provided between the flange 8a and the flange 5a of the chip holder 5. The ball-point pen refill 1 was obtained by disposing the cylindrical metal member 9 in the above.

The above-mentioned ball-point pen refill 1 is press-fitted between the resin-made ink storage tube 2 and the resin-made chip holder 5, and the dimensional accuracy can be strictly set. Leakage is unlikely to occur. Further, since the metal member 9 is provided on the outer periphery of the ink storage tube 2, it is possible to improve the high-grade appearance and gas barrier properties in appearance. Further, the metal member 9 is provided with a flange 5a of the tip holder.
Since it is arranged between the flange portion 8a of the tail plug and the tail plug, movement in the axial direction can be prevented.

Embodiment 2 A ball-point pen refill 21 shown in FIG. 2 shows another example of a metal member. The ball-point pen refill 21 is the same as the embodiment 1 except that the metal member 29 is spirally arranged on the outer periphery of the ink container 2. Thus, a ballpoint pen refill 21 is obtained. The metal member 29 is formed in a spiral shape, and a gap is formed in the metal member 29. The gap serves as a window hole 30 so that the remaining amount of ink can be checked.

Embodiment 3 A ballpoint pen refill 41 shown in FIGS.
In the same manner as described above, a transparent ink container 2 made of PP resin is provided with a shear-thinning-viscosity-imparted ink 3 and a rear end of the ink is directly filled with a grease-like ink follower 4 that follows the ink as it is consumed. In the rear end opening of the metal member 49, P
The protruding portion 48b of the tail plug 48 made of E resin is press-fitted, and the protruding portion 45b of the chip holder 45 made of POM resin is press-fitted into the opening at the tip of the metal member 49. At this time,
A protrusion 45 c that protrudes further than the protrusion 45 b of the chip holder is press-fitted into the opening at the tip of the ink storage tube 2.

By fitting the chip holder 45 together with the metal member 49 and the ink containing tube 2, the setting position of the metal member 49 can be easily set, and rattling such as rotational movement of the metal member can be prevented. . Further, since the metal member 49 has the window hole 50, the remaining ink amount can be checked.

In this embodiment, a transparent ink container made of PP resin, a chip holder made of POM resin, and a tail plug made of PE resin are used for convenience.
It can be appropriately selected and used. In addition, press fitting is used for the method of mounting the tip holder, the tail plug, and the metal member, but the present invention is not limited to this.

[0020]

Since the barrel of the writing instrument according to the present invention has the above-described structure, it is possible to prevent the ink from leaking from the ink storage tube and the fitting portion such as a ball-point pen tip, a tip holder or a tail plug, and to improve the appearance. It was possible to provide a ballpoint pen refill with a high-class feeling and further excellent gas barrier properties.

[Brief description of the drawings]

FIG. 1 is a vertical sectional view of a main part of a ballpoint pen refill according to a first embodiment of the present invention.

FIG. 2 is an external view of a ballpoint pen refill according to a second embodiment of the present invention.

FIG. 3 is a longitudinal sectional view of a main part of a ballpoint pen refill according to a third embodiment of the present invention.

FIG. 4 is an enlarged cross-sectional view of an essential part of the chip holder fitting portion and the tail plug fitting portion in FIG.

[Explanation of symbols]

 1, 21, 41 Ballpoint pen refill 2 Ink storage tube 5, 45 Tip holder 5a, 45a Flange 5b, 45b Projection 45c Projection 6 Ballpoint pen tip 7 Ball 8, 48 Tail plug 8a, 48a Flange 8b, 48b Projection

Claims (4)

[Claims] 1. A ball-point pen refill in which a ball-point pen tip holding a ball rotatably is mounted directly or via a chip holder on the tip of an ink container made of resin, which is directly filled with ink for a ball-point pen. ,
A ballpoint pen refill, wherein the outer periphery of the ink storage tube is covered with a metal member. 2. The ink container according to claim 1, wherein said ink container tube is made of a transparent or translucent material, and said metal member is provided with a window for checking the remaining amount of ink.
Ballpoint pen refill according to. 3. The ink cartridge according to claim 1, wherein the ball-point pen tip is disposed in the ink storage tube via a chip holder, and a tail plug is attached to a rear end of the ink storage tube. A flange having an outer diameter larger than the diameter is formed, and the metal member is disposed between the flange of the tip holder and the flange of the tail plug.
Ballpoint pen refill according to. 4. The ink container according to claim 1, wherein the ink holding tube includes a resin chip holder and / or a tail plug.
Alternatively, the projection formed on the tail plug is attached to the opening of the metal member, and the projection formed on the projection is attached to the leading end and / or the rear end opening of the ink storage tube. 4. The ballpoint pen refill according to any one of 1 to 3.