JP2003300395A - Ejection-type ball-point pen - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an ejection-type ball-point pen best-suited for a notebook with which many legible small letters can be written on a small writing space, and which can be easily inserted into a retaining ring of a system notebook or the like. <P>SOLUTION: This ball-point pen contains an aqueous ink 81 and a follower element 82 which advances following the consumption of the aqueous ink 81 inside a refill 5. The outside diameter of a ball 61 to be rotatably embraced by the apex of the tip part of the ball-point pen is set within the range of 0.3 to 0.4 mm. The maximum outside diameter of the barrel 2 is set within the range of 5 to 9 mm and a single refill 5 is housed inside the barrel 2. An anti-slip part 32 is provided on the outer surface of the forward part of the barrel 2. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a knock type ballpoint pen. Specifically, it relates to a knock-type ballpoint pen that is most suitable for a notebook.

[0002]

2. Description of the Related Art Conventionally, in a knock-type ballpoint pen for a notebook, a configuration is known in which the outer diameter of the barrel is thin. This is because the refill housed inside the barrel is an oil-based ink ballpoint pen. Bote (that is, a phenomenon in which ink is collected on the outer surface of the chip body behind the ball due to the rotation of the ball and adheres to the paper surface during writing to stain the paper surface) may occur. In particular, when the batter occurs, when writing in a limited small space of the notebook, there is a possibility that there will be no space for writing, and since the notebook is usually written in small letters, the letter will May be crushed and become unreadable.

In the conventional ball-point pen, a structure in which a plurality of water-based ink ballpoint pen refills are housed inside a barrel is known. This is because the barrel has a large outer diameter and a retaining ring for a system notebook or the like. Since it is difficult to insert into a notebook, it is not suitable for a notebook.

[0004]

SUMMARY OF THE INVENTION The present invention solves the above-mentioned problems of the prior art, in which many legible small characters can be written in a small writing space, and moreover,
The present invention aims to provide a knock-type ballpoint pen that can be easily inserted into a retaining ring of a system notebook or the like and is optimal for a notebook.

[0005]

[1] According to the present invention, a refill 5 having a ball-point pen tip at its tip and filled with ink, and a refill 5 housed therein and having a clip 41 on the outer surface of the rear portion. A knock type ball-point pen configured such that the tip of the ball-point pen can be retracted from the tip hole 31 of the barrel 2 by pressing the knock portion 42 at the rear end of the barrel 2 forward. 1, a water-based ink 81 and a follower 82 that moves forward as the water-based ink 81 is consumed are housed inside the refill 5, and the ball 61 is rotatably held at the tip of the ball-point pen tip. The diameter is set in the range of 0.3 mm to 0.4 mm, and the maximum outer diameter of the barrel 2 is set in the range of 5 mm to 9 mm (claim 1).

According to the first aspect, it is possible to provide the knock type ballpoint pen 1 most suitable for the notebook. That is, the ball 61
By setting the outer diameter of No. 3 to a range of a small outer diameter of 0.3 mm to 0.4 mm, a handwriting with a narrow width can be obtained, which is optimal for a notebook. Also, by using a water-based ink ballpoint pen refill as the refill 5, the occurrence of bloating is eliminated,
Many small, legible characters can be written in a small writing space, making it ideal as a notebook. Furthermore, the shaft cylinder 2
By setting the outer diameter of the device to a small outer diameter range of 5 mm to 9 mm, it can be easily inserted into a retaining ring such as a system notebook, and the clip 41 on the outer surface of the barrel 2 can be properly locked to the retaining ring. It becomes possible and becomes the most suitable for the notebook. If the outer diameter of the shaft cylinder 2 is smaller than 5 mm, the outer surface of the shaft cylinder 2 may not be stably gripped, and if it is larger than 9 mm, it may not be possible to engage with a retaining ring such as a system notebook.

The "ball-point pen tip" means the portion protruding from the tip hole 31 of the barrel 2 and the tip hole 3 of the barrel 2.
1 refers to a portion that slides with the inner surface, for example, a configuration of only a chip body having a rotatable ball at its tip, a configuration including a chip body and a cover member that supports the outer surface of the chip body, a chip body and the chip A configuration including a pen tip holder to which the main body is attached, a configuration including a tip body, a cover member that supports the outer surface of the tip body, and a pen tip holder to which the tip body and the cover member are attached may be mentioned. The “refill” is a ball-point pen refill that is exchangeably housed in the barrel 2. The "water-based ink" is an ink containing water as a main solvent, and examples thereof include a water-based ink having a shear thinning property or a non-shear thinning water-based ink. Aqueous inks with reduced viscosity are preferred. The "following body" is a material that advances as ink is consumed and prevents the ink from retreating (that is, backflow). For example, a highly viscous fluid, a movable stopper made of an elastic material, or a solid in a highly viscous fluid. An example is a configuration in which objects are stored. The "maximum outer diameter of the barrel" means the maximum outer diameter of the barrel except the clip 41.

[2] In the knock type ballpoint pen 1 according to claim 1, it is preferable that a single refill 5 is housed inside the barrel 2 (claim 2). As a result, the outer diameter of the shaft cylinder 2 can be set to be smaller than that in the case where a plurality of refills are housed inside the shaft cylinder 2 (that is, a double ballpoint pen), which is even more suitable for a notebook.

[3] In the knock type ball-point pen 1 according to claim 1 or 2, the non-slip portion 3 is provided on the outer surface of the front portion of the barrel 2.
It is preferable to provide 2 (claim 3).

In the knock type ball-point pen 1 according to the first or second aspect, since the outer diameter of the barrel 2 is relatively small, it cannot be grasped sufficiently, and the barrel 2 is manually held when the knock portion 42 is pressed. There is a possibility that the shaft cylinder 2 slides in the inside and moves to the front, and when writing, the shaft cylinder 2 slides between the fingers and moves to the rear due to the writing pressure. The anti-slip portion 32 prevents the axial cylinder 2 from moving in the front-rear direction during pressing operation and writing, and enables stable pressing operation and stable writing.

The "slip prevention portion" may be composed of, for example, an elastic material (for example, rubber or thermoplastic elastomer) or an uneven portion. Examples of the rubber include synthetic rubber such as nitrile rubber, silicon rubber, urethane rubber or natural rubber. The thermoplastic elastomer is, for example, styrene-based, olefin-based, urethane-based, nitrile-based, polyester-based, polyamide-based,
Examples thereof include vinyl chloride type and fluorine type.

[4] In the knock type ball-point pen 1 of claim 1, the tip portion of the ball-point pen is a tip body 6 made of a metal thin tube having a ball 61 rotatably held at its tip, and the tip. Ball holding portion 62 of the main body 6
And a metal cover member 7 that supports the outer peripheral surface of the rear of the metal cover member 7, and the outer surface of the metal cover member 7 is the tip hole 3 of the shaft tube 2.
1 is slidable on the inner surface (claim 4).

According to the fourth aspect, the wobbling of the tip of the ball-point pen during writing can be reliably prevented. That is, although the tip body 6 made of a metal thin tube is apt to wobble during writing, the metal cover member 7 supports the outer peripheral surface of the rear side of the ball holding portion 62 of the tip body 6 so that Wobble during writing of the chip body 6 is prevented. In addition, since the outer surface of the metal cover member 7 is configured to be slidable with the inner surface of the tip hole 31 of the shaft cylinder 2, the outer surface of the metal cover member 7 is slidable during writing.
Since it is stably supported by the inner surface of the tip hole 31 of the shaft, the writing is much more difficult than when the pen tip holder made of synthetic resin or the cover member made of synthetic resin slides on the inner surface of the tip hole 31 of the shaft cylinder 2. The wobble of the tip of the ballpoint pen is prevented.

The "metal thin tube" is, for example, a right cylindrical metal thin tube having an outer diameter of 0.45 mm to 0.7 mm.

[0015]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a vertical cross-sectional view of an embodiment of the present invention showing a projecting state of the tip of a ballpoint pen, and FIG. 2 is an enlarged vertical cross-sectional view of the essential parts of FIG.

The knock type ballpoint pen 1 of this embodiment comprises a barrel 2 and a single refill housed inside the barrel 2.

The shaft cylinder 2 comprises a front shaft 3 and a rear shaft 4 which are detachably screwed to each other. The front shaft 3 is a cylindrical body obtained by injection molding of a synthetic resin (for example, polycarbonate), and the outer surface thereof has a two-color molded anti-slip portion 32 made of an elastic material (for example, styrene-based thermoplastic elastomer). Provided by. Further, the front end of the front shaft 3 is tapered, and a front end hole 31 is opened at the front end thereof. A male screw portion 33 is formed at the rear end of the front shaft 3.

The rear shaft 4 is a cylindrical body obtained by injection molding of synthetic resin (for example, polycarbonate),
A female screw portion 43 that can be screwed into the male screw portion 33 of the front shaft 3 is formed in the tip opening. A clip 41 is provided on the outer surface of the rear portion of the rear shaft 4, and the rear end portion of the rear shaft 4 has a knock portion 4 that can be pressed forward.
Two are provided. Further, a retracting mechanism (not shown) including a rotating cam is provided inside the rear shaft 4. The retracting mechanism operates by pushing the knock portion 42 forward, and the tip of the ballpoint pen of the refill 5 projects and retracts from the tip hole 31. The maximum outer diameter of the barrel 2 (that is, the front shaft 3 and the rear shaft 4) is set to 8.5 mm.

The refill 5 has a tip body 6 in which a ball 61 is rotatably held at its tip, and the tip body 6
Metal cover member 7 for supporting the rear outer peripheral surface of the ball holding portion 62, the chip body 6 and the metal cover member 7
Is composed of a pen tip holder 9 press-fitted and fixed to the tip portion, and an ink storage tube 8 where the pen tip holder 9 is press-fitted and fixed to the tip opening portion. In this embodiment, the tip of the ballpoint pen is
Chip body 6, metal cover member 7, and pen tip holder 9
It consists of the tip.

The ink containing tube 8 is made of a synthetic resin (for example, polypropylene) extruded product (outer diameter: 3 mm), and has an aqueous ink 81 having a shear thinning property inside.
And a follower 82 made of a high-viscosity fluid that is disposed at the rear end of the water-based ink 81 and advances as the water-based ink 81 is consumed.

The chip body 6 is a straight cylindrical metal thin tube (for example, austenitic stainless steel thin tube) having a uniform thickness. In the vicinity of the tip of the chip body 6, a plurality (specifically, 3
Individual inward projections are formed, thereby forming a ball receiving seat. Furthermore, at the tip of the chip body 6,
Due to the inward pressing deformation, an annular inward tip edge portion is formed. A ball holding portion 62 is configured by the tip edge portion and the ball receiving seat, and the ball 61 is rotatably held therein. In this embodiment, the ball 61 is
An outer diameter of 0.3 mm or 0.4 mm is adopted.
When the outer diameter of the ball 61 is 0.3 mm, the outer diameter of the chip body 6 is set to 0.5 mm, and when the outer diameter of the ball 61 is 0.4 mm, the outer diameter of the chip body 6 is 0 mm. ．
It is set to 65 mm.

The metal cover member 7 is a chip body 6
And a large diameter portion 72 formed behind the small diameter portion 71 and fixed to the outer surface of the front portion of the pen tip holder 9. The outer surface of the large diameter portion 72 of the metal cover member 7 is slidable with the inner surface of the tip hole 31 of the shaft tube 2, and the outer diameter thereof is set to be slightly smaller than the inner diameter of the tip hole 31 of the shaft tube 2. To be done. The metal cover member 7 prevents the tip body 6 from wobbling during writing, and at the same time enables stable contact with the inner surface of the tip hole 31,
The wobbling of the metal cover member 7 and the tip of the pen tip holder 9 during writing is prevented.

The nib holder 9 is obtained by injection molding of synthetic resin (eg polypropylene). The pen tip holder 9 includes a cylindrical front portion 91 to which the tip body 6 and the metal cover member 7 are fixed, and the cylindrical front portion 91.
Flange 92 that is connected to the rear of the ink containing tube 8 and is in contact with the tip surface of the ink containing tube 8, and a cylindrical shape that is connected to the rear of the flange 92 and is press-fitted into the inner surface of the tip opening of the ink containing tube 8. Rear 9
3 and 3.

Further, inside the pen tip holder, a backflow preventive device comprising a regulating wall portion 10a, a valve seat 10b, and a ball valve 10c which can float between the regulating wall portion 10a and the valve seat 10b. 10 are provided. The regulation wall portion 10a
Has a step shape, and the ball valve 10c abuts thereon so as not to prevent the ink flow when the pen tip faces downward. The valve seat 10b is an annular member that is press-fitted and fixed to the inner surface of the rear portion of the pen tip holder 9, and the ball valve 10c comes into close contact with the pen tip holder 9 when the pen tip is directed upward, thereby preventing the ink from moving backward.

A coil spring 11 is housed in the barrel 2. The coil spring 11 biases the refill 5 backward, and pushes the knock portion 42 forward against the backward bias.

In the present invention, a spring for urging the ball 61 of the chip body 6 forward may be provided to bring the ball 61 into close contact with the inner surface of the inward tip edge portion. With the above configuration, when not writing, the ball 61 is in close contact with the inner surface of the inward tip edge portion, and ink leakage from the pen tip and air inclusion can be prevented,
In addition, at the time of writing, the ball 61 is retracted by the writing pressure, the close contact between the ball 61 and the inward tip edge portion is released, and the ink is ejected from the pen tip. It is effective for ballpoint pens.

In the present invention, a ball receiving seat may be formed at the tip of the chip body 6 by cutting.

[0028]

According to the first aspect, many legible small characters can be written in a small writing space, and
Since it can be easily inserted into a retaining ring of a system notebook or the like, it is possible to provide a knock-type ballpoint pen most suitable for a notebook.

According to the second aspect, the outer diameter of the shaft cylinder can be set to be small, which is more optimal for a notebook.

According to the third aspect, it is possible to prevent the axial cylinder from moving in the front-rear direction during a pressing operation and a writing operation, and to perform a stable pressing operation and a stable writing operation.

According to the fourth aspect, the wobbling of the tip of the ball-point pen during writing can be reliably prevented.

[Brief description of drawings]

FIG. 1 is a vertical sectional view showing an embodiment of the present invention.

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

[Explanation of symbols]

1 knock type ballpoint pen 11 coil spring Biaxial cylinder 3 front axis 31 Tip hole 32 Anti-slip part 33 Male thread 4 rear axle 41 clips 42 Knock part 43 Female thread 5 Refill 6 chip body 61 balls 62 ball holding part 7 Metal cover member 71 Small diameter part 72 Large diameter part 8 Ink storage tube 81 Water-based ink 82 Follower 9 Pen tip holder 91 cylindrical front 92 Tsuba 93 Cylindrical rear part 10 Backflow prevention device 10a Control wall part 10b valve seat 10c ball valve

Claims (4)

[Claims] 1. A rear end of a shaft cylinder, which comprises a refill having a ball-point pen tip at its tip and having ink filled therein, and a barrel having the refill contained therein and a clip on the outer surface of the rear portion. A knock type ballpoint pen in which the tip of a ballpoint pen can be retracted from the tip hole of a shaft cylinder by pressing the knock portion of the shaft portion forward, and the water-based ink and the water-based ink are moved forward in the refill. And a follower that moves the outer diameter of the ball rotatably held at the tip of the tip of the ballpoint pen to 0.3 mm to 0.4 mm.
The maximum outer diameter of the barrel is 5 mm to 9 mm.
A knock-type ballpoint pen set in the range of mm. 2. A knock type ballpoint pen according to claim 1, wherein a single refill is housed inside the barrel. 3. The knock type ball-point pen according to claim 1, wherein a non-slip portion is provided on the outer surface of the front portion of the barrel. 4. A tip body made of a metal thin tube having a ball rotatably held at its tip, the tip of the ballpoint pen,
2. A metal cover member supporting an outer peripheral surface of a rear portion of a ball holding portion of the chip body, wherein an outer surface of the metal cover member is configured to be slidable with an inner surface of a tip hole of a barrel. The knock-type ballpoint pen according to 2 or 3.