JP3375214B2 - Aqueous ball pen refill - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a refill for a water-based ballpoint pen, and more particularly to an improvement of the refill in which a vent means for ventilating with the outside air is provided on the tip side.

[0002]

2. Description of the Related Art Problems to be solved by the prior art and the present invention: Conventionally, a refill of a water-based ballpoint pen that stores ink in a cartridge and transmits ink to a ball portion through an ink guide core has a cartridge like the present invention. It is generally known that a vent hole is provided on the tip end side, and that a tail plug portion that is fixed to the rear end of the cartridge is provided with a vent hole. The refill with a vent hole on the tip side of the cartridge,
With the cap type that carries the pen tip upwards, there is no risk of ink spilling out of the cartridge even if ink is dispersed from the ink occluder due to excessive shock or sudden changes in atmospheric pressure or temperature. The refill that has a vent hole in the tail plug part that is fixed to the rear end of the cartridge is a knock type type that carries the pen tip part in a downward state, so there is no worry if the same change as before occurs. There are advantages.

However, if the above-mentioned is turned over, that is, the refill having a vent hole on the tip end side is changed to a knock type, and the refill having a vent hole on the tail plug part is changed to a cap type, an excessive impact or a shock is generated. The fear of ink leaking out of the cartridge due to sudden changes in atmospheric pressure and temperature cannot be eliminated. However, regarding the refill with a vent hole in the tail plug,
In some cases, refills for both cap type and knock type have been taken by taking measures to prevent ink from leaking from the rear part by devising the shape of the tail plug part.

On the other hand, for a refill having a vent hole on the tip side, the inflow of outside air dries the ink at the tip of the ink guide or the tip of the ink occlusion body located at the tip of the refill,
There is a possibility that writing performance may be deteriorated or writing may not be possible, and for example, a device for eliminating this cause is disclosed in Japanese Utility Model Publication No. Hei 2-21266. In this device, the ink guide core is covered with an insertion hole. The tip of the ink occlusion body is covered with its tubular part to provide an ink occlusion body receiver at the refill tip to prevent the evaporation of ink from each part, so that the outside air communicates with the rear end of the ink occlusion body. Since it was configured, it was possible to maintain good writing performance, but there were problems such as the volume of the ink occlusion body decreasing and the ink amount decreasing, and there was a risk of damage to the tip of the ink occlusion body during assembly. .

In Japanese Utility Model Publication No. 4-34066 and Japanese Utility Model Publication No. 3-53904, a chip holding a ball is fitted into the tip opening portion of the center hole, which is intended to be improved by the present invention. A water-based ballpoint pen refill in which a tip holder protruding from the rear end opening of a central hole so that the rear end of the accommodated ink guide core is buried in the ink absorber is fitted to a cartridge containing the ink absorber. However, both of them have a large number of parts because the tail plugs are fixed to the rear end of the cartridge, and especially in Japanese Utility Model Publication No. 3-53904, the tip of the ink occlusion body is damaged, or in some cases, inside the air flow passage. It may be difficult to say that all of them are perfect, as there may be adverse effects such as ink penetrating into the
At present, it is unavoidable as a knock-type water-based ballpoint pen refill.

[0006]

The present invention addresses these problems by
Fitting part between the cartridge and the cartridge which is cylindrical with the same outer diameter and the same thickness, and which is open at the front end and has a bottom end with an ink storage body receiving part integrated inside An air groove is formed in the outer peripheral surface, and a flat rear end surface perpendicular to the axial direction is formed, and ink is directed toward the front end portion between the center hole of the rear end surface and the outer peripheral surface of the cartridge fitting portion. A chip holder provided with a reservoir groove is used as a means for solving the problem by stably holding the ink occlusion body.

[0007]

According to the present invention, by using a cartridge having a front end opened and a rear end formed with a bottom, a tail plug is attached to a conventional water-based ballpoint pen refill in which the tail plug is fixed to the rear end of the cartridge. It is unnecessary to reduce the number of parts, and moreover, the ink absorber is stably held by the ink absorber receiving part provided inside the rear end of the cartridge and the rear end face formed by a plane perpendicular to the axial direction of the chip holder. In addition, by providing an ink reservoir groove hole in the direction of the front end between the center hole of the rear end surface and the outer peripheral surface of the cartridge fitting portion, it is possible to move to the outside of the cartridge due to excessive impact or a sudden change in atmospheric pressure or temperature. It also eliminates the concern about ink spillage and can be used as a knock type refill with the pen tip facing downwards when carrying.

[0008]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows a water-based ballpoint pen refill R according to an embodiment of the present invention, in which a cartridge 1 is an inner cylinder having a substantially same outer diameter and the same thickness, and is opened at a front end 1a and a rear end 1b.
Has an ink storage member receiving portion 1c integrally formed therein and is formed with a bottom. Inside, an ink storage member 4 in which a batting is covered with an outer cover 4c is filled with ink and stored.

The chip holder 2 is a cartridge 1
An air groove 2b is formed in the outer peripheral surface 2a of the fitting portion, and a rear end surface 2c is formed on a plane perpendicular to the axial direction, and the center hole 2d of the rear end surface 2c and the outer peripheral surface 2a of the fitting portion are formed. An ink reservoir groove hole 2e is provided between them, and a tip 3 holding a ball is fitted into a tip opening 2g of the center hole 2d, and an ink guide core 5 accommodated in the tip 3 is formed. The ink storage member receiving portion 1 provided on the rear end portion 1b of the cartridge 1 is fitted into the front end portion 1a of the cartridge 1 in a state where the rear end portion is protruded by a predetermined length so as to be buried in the ink storage member 4.
c and the rear end surface 2c of the chip holder 2 stably secures the ink occlusion body 4, whereby the air entering through the air groove 2b passes through the gap 8 between the outer skin 4c of the ink occlusion body 4 and the inner wall of the cartridge 1. It is configured to communicate with the rear end surface 4b of the ink occlusion body.

Further, the embodiment of the present invention will be described in detail. Of course, the material of the cartridge 1 may be either metal or resin, and the ink occlusion body 4 can be held stably and surely. At the same time, in order to secure a ventilation path, an ink absorber receiving portion 1c is provided inside the rear end portion 1b so that the ink absorber rear end surface 1b comes into contact with the bottom portion in a rib shape at several places.

The chip holder 2 is obtained by molding a resin material, and the outer peripheral surface 2 of the fitting portion with the cartridge 1 is formed.
and air grooves 2b in spiral elongated grooves example in a, continuous thereto
The concave groove 2h larger than the air groove 2b is in contact with the rear end surface.
Is provided on the circumference, and an ink reservoir groove hole 2e is formed in the rear end surface 2c formed by a plane perpendicular to the axial direction between the center hole 2d and the fitting portion outer peripheral surface 2a. The recessed groove 2h enters the air groove 2b of the ink dispersed in the gap 8 between the inner wall of the cartridge 1 and the outer surface 4c of the ink occlusion body, which is caused by an unexpected situation such as a displacement of the ink occlusion body 4 is impacted. The ink reservoir slot 2e formed in the rear end surface 2c is for preventing excessive impact, atmospheric pressure and temperature when the ink occlusion body 4 is secured in a stable and normal state. Is for temporarily holding the ink dispersed from the ink occlusion body 4 due to a sudden change in the ink, and for preventing the ink from flowing out of the cartridge 1. The rear end surface 2 is formed on a flat surface.
c contacts the front surface 4a of the ink occlusion body, and holds the ink occlusion body 4 stably and surely.

The tip holder 2 is further provided with a close contact portion 2f having an inner diameter substantially the same as the outer diameter of the ink guide core 5 on the rear end opening side of the central hole 2d, and the rear end surface 2c and the ink occlusion body front end surface 4a.
Even in the unexpected situation where the outside air flows in between, the outside air is prevented from flowing into the center hole 2d to prevent the writing performance from being deteriorated and the writing failure due to the ink drying of the ink guide core 5. As a result, since the inside of the center hole 2d is always kept wet with ink, the writing performance is further improved.

In the conventional water-based ballpoint pen refill R ₁ shown in FIG. 3, the ink color indicator is distinguished by coloring the tail plug 9 fixed to the rear part of the cartridge 1 ₁ by coloring it in the same color as the ink color. The same applies to a refill having a vent hole in the tail plug portion of. In the water-based ballpoint pen refill R of the present invention, it is sufficient to display the ink color by coloring the tip holder 2 with the ink color. However, when assembling with an assembling machine, it is inconvenient for the tip holder 2 to be colored. In some cases, a step 1d may be formed on the rear end 1b of the cartridge 1, and a color 6 having the same color as the ink color may be attached to the step 1d. Alternatively, the display 7 having the same color as the ink color may be provided by stamping.

The water-based ballpoint pen refill R of the present invention having such a structure has a structure in which a vent hole is provided on the tip end side, but it has the potential of the conventional water-based ballpoint pen refill R1 having a vent hole on the tip end side. Problems that have arisen, namely deterioration of writing performance caused by evaporation of ink from the ink guide core 5 and the ink absorber front end surface 4a around the vent, and use as a refill for a knock-type writing instrument that carries the pen tip downward. It also solves the anxiety of ink outflow to the outside of the cartridge caused by an unexpected situation. That is, according to the present invention, the rear end portion 1b of the cartridge 1 is formed to have a bottom, and both end surfaces 4a and 4b of the ink storage member 4 are stably secured by the ink storage member receiving portion 1c and the rear end surface 2c of the chip holder 2. And the outer peripheral surface 2 of the fitting portion of the chip holder 2
The concave groove 2h connected to the air groove 2b of a and the ink reservoir groove hole 2e formed in the rear end surface 2c are provided to process the ink dispersed from the ink occlusion body 4 and to the central hole 2d of the chip holder 2. Since the contact portion 2f with the ink guide core 5 is provided to keep the inside of the central hole 2d always wet with the ink, the defect of the conventional water-based ballpoint pen refill in which the vent hole is provided on the tip side is completely eliminated. After being wiped off, it can be used in both cases without discrimination between knock type and cap type, and the commonality of refills can be achieved.

[0016]

[Effect] According to the present invention, in the case of the water-based ballpoint pen refill of the type in which the ink occlusion body is housed in the cartridge and the ink is transmitted to the ball portion through the ink guide core, the refill common to both types is used without distinction between knock type and cap type. The product planning became possible, and we have moved forward to the desire to reduce the number of refill varieties that have been strongly demanded by dealers and users, and to have commonality and compatibility. Up to this point, in the water-based ballpoint pen refill having a vent hole on the tip side of the present invention, the position of the vent hole is close to the tip of the ink guide core or the ink occlusion body, which strongly affects the writing performance. In comparison with the configuration in which the vent hole is located at the tail plug part that is fixed to the rear part of the cartridge, in terms of maintaining writing performance, and when using the knock type with the pen tip carried downward, There was a handicap in terms of the fear of ink leakage.

However, according to the present invention, the cartridge has a bottom, the ink absorber receiving portion is integrally formed in the rear portion, and the air groove is arranged on the outer peripheral surface of the fitting portion of the chip holder with the cartridge and is connected to this . By providing a concave groove and an ink reservoir groove hole on the rear end face, and by further providing a part that is in close contact with the ink guide core on the rear end side of the central hole, the outflow of ink that has dispersed from the ink occlusion body to the outside of the cartridge is prevented. Furthermore, by blocking the inflow of outside air into the center hole and keeping the center hole always wet with ink, the writing performance was stabilized and the writing performance was further improved. . This eliminates the need to provide a separate refill for the knock type or cap type, making it possible to achieve commonality of refills, so consider reducing the number of refill types and compatibility with other types of ballpoint pen refills. In doing so, the restrictions have been removed.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view of an aqueous ballpoint pen refill which is an embodiment of the present invention.

FIG. 2 is a partially cutaway cross-sectional view of a water-based ballpoint pen refill that is an embodiment of the present invention.

FIG. 3 is a vertical cross-sectional view of a conventional water-based ballpoint pen refill having a ventilation hole on the tip side.

FIG. 4 is a vertical cross-sectional view of a water-based ballpoint pen refill in which a ventilation hole is located at the tail plug portion.

[Explanation of symbols]

1 cartridge 1a front end 1b rear end 1c ink absorber receiving part 1d step 2 chip holder 2a fitting part outer peripheral surface 2b air groove 2c rear end surface 2d center hole 2e ink reservoir groove hole 2f close contact part 2g front end opening 2h concave Groove 3 Tip 4 Ink occlusion body 4a Front end surface 4b Rear end surface 4c Outer skin 5 Ink lead core 6 Color 7 Display 8 Gap 9 Tail plug 1 ₁ Cartridge (type with tail plug attached to the rear) R Water-based ballpoint pen refill R ₁ Water-based bottle -Lupen refill (conventional product)

Claims (4)

(57) [Claims] 1. A chip holder in which a tip holding a ball is fitted into the tip end opening of the central hole, and the rear end of the ink guide core housed in the tip is projected from the rear end opening of the central hole. In a water-based ballpoint pen refill fitted into a cartridge containing an ink occlusion body filled with ink, the cartridge (1) has a cylindrical shape having substantially the same outer diameter and the same thickness, and has a tip portion (1a). The opened rear end portion (1b) is integrally formed with an ink storage member receiving portion (1c) inside to form a bottom, and the chip holder (2) is an outer peripheral surface of a fitting portion with the cartridge (1). On (2a), on the rear end face (2c)
An open air groove (2b) is formed, and a rear end face (2c) is formed on a plane perpendicular to the axial direction, and the rear end face (2c) is formed.
A water-based ballpoint pen refill characterized in that an ink reservoir groove hole (2e) is provided between the center hole (2d) and the outer peripheral surface (2a) of the fitting portion toward the tip end portion. 2. A central hole (2) of the chip holder (2).
The water-based ballpoint pen refill according to claim 1, wherein a contact portion (2f) having an inner diameter substantially the same as the outer diameter of the ink guide core (5) is provided on the rear end opening side of d). 3. The chip holder (2) is colored in the same color as the ink color, or a step (1d) is formed at the rear end (1b) of the cartridge (1) to obtain the same color as the ink color. The water-based ballpoint pen refill according to claim 1, wherein a collar (6) is attached to the step (1d). 4. A water-based ballpoint pen refill according to claim 1, wherein the surface of the cartridge (1) is printed or stamped to display the same color as the ink color (7).