JP3643186B2 - Ballpoint pen refill - Google Patents

Description

[0001]
[Industrial application fields]
The present invention relates to a refill of a ballpoint pen which is mounted on a double writing instrument and is mainly filled with an aqueous or low-viscosity oil-based pen ink having shear thinning viscosity.
[0002]
[Prior art]
2. Description of the Related Art In general, there is known a compound writing instrument in which a plurality of writing bodies such as ballpoint pens are mounted and a writing tip portion can be selectively projected and retracted from an axis tip.
In addition, as for the mechanism of the writing tip of the double writing instrument, the knocking type, the slider type that alternately slides the slider that protrudes from the side surface of the shaft of the writing instrument, and the cam cylinder with an inclined surface are rotated. Various types such as a cam type are known.
[0003]
On the other hand, a water-based, low-viscosity oil-based ballpoint pen with shear thinning (medium viscosity) has a large ink-holding tube, so when mounted on a double-sized writing instrument of normal thickness, there is no degree of freedom between the cursive bodies. The tip of the writing body is not centered smoothly in the tip hole of the shaft tube, and the operation is hindered so that the writing tip does not appear or disappear. Therefore, there is a drawback that the shaft tube becomes extremely thick to enable the operation, and portability and usability are deteriorated.
[0004]
Since the water-based ballpoint pen has a low viscosity of several mPa · S or less, it has an advantage that it can be written with a light writing pressure and has a good writing quality. However, there is a drawback that a direct current phenomenon in which the ink flows gently from the tip of the pen, and a reverse flow phenomenon in which air flows out from the tip of the ballpoint pen and the ink flows out. A method of preventing these phenomena by using a fiber converging body called batting is used.
Further, when left in a cap-off state, there is a problem that the vapor pressure of the solvent is high and the solvent is leaked, so that the tip is dried and the ink does not flow out and cannot be written.
[0005]
On the other hand, the oil ballpoint pens known in the past have a high resistance when the ball rotates when the ink flows out from the pen tip because the ink used in the ballpoint pen has a high viscosity of several thousand mPa · S or more. There is a drawback of poor writing. In addition, there is a problem that the amount of ink flowing out from the tip during writing is small, there is a blurring phenomenon, the writing line is uneven, the handwriting density is low, and a high writing pressure is required.
As an improvement of this oil-based ballpoint pen, recently, a ballpoint pen for water-based ink called medium viscosity using the above-mentioned intermediate viscosity region (several mPa · S to several thousand mPa · S) of water and oil has been developed. This is a ballpoint pen using a relatively low-viscosity aqueous ink having a characteristic that the viscosity is lowered by rotation of the tip ball and the ink flows out smoothly, so-called shear thinning. However, since this ink has a drawback that the ink tends to dry, a cap for sealing the writing tip is usually required. Further, the amount of ink flowing out increases, and in order to extend the writing life, it is necessary to increase the ink filling amount by increasing the diameter of the ink containing tube.
[0006]
As an improvement of the above oil-based ballpoint pen, a ballpoint pen using a low-viscosity oil-based ink excellent in drying resistance is conceivable. However, the ink outflow amount increases, and the diameter of the ink containing tube is increased in order to extend the writing life. It is necessary to increase the ink filling amount by increasing the thickness. Also, due to the low viscosity of the ink, when the tip side is faced downward, if there is a gap between the tip ball and the chip holding part, the ink may ooze out (DC) or the amount of ink flowing out during writing will increase. There are drawbacks.
[0007]
Since both the above-mentioned medium-viscosity water-based ink and low-viscosity oil-based ink have low viscosity, there is a phenomenon in which the ink is liable to reverse flow or direct current.
In addition, the medium-viscosity water-based ballpoint pen is usually filled with a grease-like translucent non-drying substance called a follower at the rear end of the ink containing tube, so the problem of preventing ink evaporation is the problem with the pen tip, that is, the tip ball and the tip. What is necessary is to reduce evaporation from the gap between the ball holding portions. For example, if a solvent having a considerably low vapor pressure, such as an oil-based ballpoint pen, is mainly used, it is not necessary to consider ink evaporation. However, since water is the main solvent in the case of water-based inks, the evaporation of water cannot be prevented simply by selecting a low vapor pressure solvent.
[0008]
[Problems to be solved by the invention]
The object of the present invention is to solve the above-mentioned problems of the prior art, that is, a plurality of ballpoint pen refills can be mounted in the shaft cylinder, and the writing tip of each writing body can be selectively projected and retracted from the tip of the shaft cylinder. It is possible to provide a refill of a ballpoint pen filled with a medium-viscosity aqueous or low-viscosity oil-based ink for a dual-type writing instrument excellent in portability and usability. Also, ink backflow and direct current phenomenon do not occur, the dry resistance of the pen tip is maintained, the cap can be removed and the ink can be left standing, and ink backflow and ink direct current due to drop impact and upward writing can be prevented. And
[0009]
[Means for Solving the Problems]
The ballpoint pen refill according to the present invention includes a plurality of ballpoint pen refills, and a ballpoint pen refill that is mounted on a compound writing instrument in which each writing tip can be selectively projected and retracted from an axis. The shaft of the dual-type writing instrument is equipped with a substantially polygonal cross-section, and the refill of the ballpoint pen has a tip that holds the tip ball, a joint and an ink storage tube behind the tip, and contains ink The ink storage part of the tube is not deformed and has a substantially polygonal cross-section, each of which is substantially closely packed in a state where it can be moved back and forth independently within the shaft cylinder, and the joint and the ink storage part are connected to each other. The connecting portion is provided with a bendable portion that can be easily shifted in the lateral direction with respect to the axial direction.
[0010]
The refill of the ballpoint pen has a spring provided so that the tip ball is always pressed and brought into close contact with the inner edge of the ball holding portion at the tip of the tip, and is released so that the close state is released during writing. The tube is filled with water-based ballpoint pen ink or so-called low-viscosity oil-based ink having a so-called shear thinning viscosity that flows out with a decrease in viscosity due to the rotation of the tip ball accompanying writing, and the ink at the back end of the ink is further filled It is filled with a follower made of a grease-like translucent non-drying material that moves following consumption.
[0011]
Also, a ball chamber is provided in which a ball valve is loosely fitted in the axial center portion of the joint in contact with the rear end of the chip, and the ball valve is in close contact with the rear portion of the valve chamber to prevent ink backflow and the ball A guide hole is provided from the receiving seat to the ink storage tube.
[0012]
【Example】
The refill of the ball-point pen of the present invention is a refill of a ball-point pen mounted on a double writing instrument, and the applied ink is mainly a water-based, low-viscosity oil-based ink having so-called shear thinning.
[0013]
As shown in the figure, the tip 12 is crimped so that the tip ball 13 is rotatably held in a state where the tip ball 13 is substantially in contact with a seat having a channel through which ink can flow. Further, the spring 15 is inserted into the tip inner hole portion, and the rear end of the tip shaft portion 14 is appropriately crimped so that the winding portion at the rear end of the spring 15 cannot be extracted. In addition, it is extremely important for the tip ball 13 to be in close contact with the inner surface of the ball holding portion of the chip for drying the writing tip and preventing direct current of ink. For this reason, the surface roughness of the inner surface of the chip holding the tip ball 13 is important. In addition, in order to improve close contact accuracy by caulking, the inner surface is ground and secondary plastic working is performed to increase caulking accuracy. In addition, surface treatment and the like are considered on the contact surface with the tip ball.
[0014]
The tip of the spring 15 is an upright rod shaft portion 16, and the tip of the rod shaft portion 16 abuts against the rear end of the tip ball 13 in a pressed state. The tip ball 13 is brought into close contact with the inner edge of the ball holding portion (formed by caulking or the like) of the chip 12 by the pressing.
[0015]
Further, the front joint 2 is formed with a front shaft portion 2a and a rear shaft portion 2b for crimping the shaft portion 14 of the chip 12 at the tip. Further, the rear joint 3 is formed as a bent portion 3b having a front cylinder portion 3a and a thin ink flow pipe 6 on the rear side thereof with a plurality of thin disk-like fins 4 in the outer peripheral axis direction. The rear shaft portion 3c is formed with the flange portion 7 on the rear surface.
As described above, the rear shaft portion 2b of the front joint 2 is firmly fixed to the inner hole of the front cylinder portion 3a of the rear joint 3, and the rear shaft portion 3c of the rear joint 3 is closely fitted to the front end hole of the ink containing tube 18. It is fixed to the shape.
As shown in FIG. 2, if the ink flow pipe 6 is formed in the shape of the rib 5, it can be easily bent only in one direction, and the wobble of the writing tip can be prevented more than necessary. The bendable portion is not limited to the shape of the embodiment.
[0016]
In addition, a ball valve 17 is loosely fitted behind the inner hole portion of the joint 2 and a valve chamber 8 is provided. A tapered or spherical ball receiving seat 9 and a guide hole 10 are provided behind the valve chamber 8. It is provided eccentrically with respect to the axis. A groove 8a is provided on one side of the inner wall of the valve chamber 8 so that ink flows in the axial direction. The ball valve 17 loosely fitted in the valve chamber 8 is in contact with a state of being biased toward the rear end of the shaft portion 14 of the chip when the chip 12 is faced downward, and the ink flow path to the chip inner hole 12c. The ink in the ink containing tube 18 flows through the guide hole 10 and into the chip inner hole portion 12c through the groove 8a and the ink flow path. On the other hand, in the upward state, the ball valve 17 is brought into close contact with the ball receiving seat 9 and the function of preventing the backflow of ink can be obtained.
[0017]
Further, a ball-point pen ink 19 is filled in the ink containing tube 18, and further, a grease-like translucent non-drying material that can move following the ink 19 in contact with the ink surface as the ink is consumed. The follower 20 is filled. Further, a resin-made follower rod 21 having a specific gravity substantially equal to that of the follower 20 is immersed in the follower 20 as necessary in order to prevent deformation due to dropping, knocking impact or the like. Further, a tail plug 22 is fixed to the rear end of the ink containing tube 18, and a shaft portion 24 at the rear end of the tail plug is fitted into an insertion hole of a connecting portion interlocked with a writing body retracting mechanism portion of a double type writing instrument. The locking groove 24a provided in the shaft portion 24 is detachably locked to the locking portion provided in the insertion hole, and the refill 1 of the ballpoint pen is attached to the dual writing instrument.
[0018]
The tail plug 22 is provided with a ventilation groove 23 for communicating the inside of the ink containing tube 18 with the outside air.
For example, a transparent polypropylene resin molded product or the like is used for the ink storage tube 18. Further, the ink containing tube 18 is selected with a material excellent in clear drainage.
The ink containing tube 18 is a non-deformable one having a rectangular cross section.
[0019]
FIG. 4 shows a refill 30 of a ballpoint pen according to a second embodiment, in which a joint 32, a bendable portion 33, and an ink containing tube 31 are formed as an integral resin molded product. The same as the embodiment.
In addition, the joint 32 and the bendable portion 33 of FIG. 4 can be integrally formed, and a rear shaft portion can be integrally formed behind the bendable portion 33 so as to be fixed to the ink containing tube 18. is there. (Not shown)
[0020]
FIG. 5 shows a state in which two ballpoint pen refills 1 and 1a are loaded on the shaft tube 40 of the dual writing instrument.
FIGS. 6 to 10 show cross-sectional views when a refill of a ballpoint pen is loaded on the shaft cylinder, and each shows an example of implementation.
FIG. 6 shows an example 1 in which two types of rectangular ballpoint pen refills are densely mounted on a rectangular shaft 40. FIG. 7 shows an example 2 in which three types of ballpoint pen refills are densely installed. .
FIG. 8 shows an example 3 in which four types of refills of ballpoint pens are mounted tightly.
FIG. 9 shows an embodiment example 4 in which four types of refills of ballpoint pens having a triangular cross section are tightly mounted on a rectangular shaft cylinder.
FIG. 10 shows an example 5 in which six types of refills of ballpoint pens having a triangular cross section are tightly mounted on a hexagonal shaft cylinder.
[0021]
[Action]
The refill 1 of the ballpoint pen has its tip 12 pointed upward, and its ball valve 17 is positioned in the ball receiving seat 9 of the valve chamber 8 to seal the guide hole 10. 13 Even if the ink on the back side runs out, the head is hung on the ink and does not flow backward. Accordingly, when the chip 12 is turned downward, the ink can immediately flow out, and dripping is prevented by writing. (By the way, in the structure that does not have a ball valve, the ink works in the reverse flow direction when writing upwards, so air is entrained in the tip, and the ink does not follow immediately when writing downwards, causing drooling)
[0022]
In the writing state with the tip 12 facing downward, the ball valve 17 abuts against one of the rear ends of the tip 12, and the other is provided with a flow path through which ink can flow into the tip 12. The ink 19 that has entered the valve chamber 8 from the storage tube 18 through the guide hole 10 is guided to the back surface of the tip ball 13.
In this state, the tip ball 13 is brought into close contact with the inner edge of the chip holding portion by the pressing of the rod shaft portion 16, so that direct current of ink is prevented. In addition, the tip ball 13 is slightly retracted by the writing pressure, so that a gap is created and ink can flow out. By writing, the tip ball 13 rotates smoothly and the ink flows out smoothly. It becomes.
[0023]
On the back surface of the tip ball 13, there is a channel (a tip ball receiving seat having a plurality of ink inflow grooves penetrating toward the chip inner hole), and a rod shaft portion 16 passes through the center hole of the channel. The ink in the chip is guided to the back surface of the tip ball 13 through the ink inflow groove and the gap between the center hole and the rod shaft portion 16.
[0024]
In addition, when the refill of a ballpoint pen is mounted on a dual-type writing instrument and each writing tip is projected and retracted from the shaft tip, even if the ink containing tube is not deformed, the writing tip portion is flexibly shifted so that the operation is not hindered. The writing tip appears and disappears smoothly from the shaft tip.
[0025]
【The invention's effect】
The configuration and operation of the refill of the ballpoint pen of the present invention are as described above, and a plurality of ballpoint pen refills are mounted in the shaft cylinder so that the writing tip portion of each writing body can be selectively projected and retracted from the tip of the shaft cylinder. Thus, it is possible to provide a refill of a ball-point pen filled with a medium-viscosity aqueous or low-viscosity oil-based ink for a dual-type writing instrument excellent in portability and ease of use.
Also, ink backflow and direct current phenomenon do not occur, the dry resistance of the pen tip is maintained, the cap can be removed and the ink can be left untouched, and ink backflow and ink direct current due to drop impact and upward writing are prevented. The
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view showing an entire refill of a ballpoint pen according to a first embodiment of the present invention.
FIG. 2 shows a cross-sectional view taken along the line AA in FIG.
FIG. 3 shows a cross-sectional view taken along the line BB in FIG.
FIG. 4 is a longitudinal sectional view showing an entire refill of a ballpoint pen according to a second embodiment of the present invention.
FIG. 5 is a longitudinal sectional view of a main part in a state where a refill of a ballpoint pen is loaded in a shaft cylinder, and the refill is shown in a non-cross section.
FIG. 6 is a transverse cross-sectional view when a ballpoint pen refill is loaded on a shaft cylinder, and shows Example 1;
FIG. 7 is an implementation example 2;
FIG. 8 is an implementation example 3;
FIG. 9 is an implementation example 4;
FIG. 10 is Example 5.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Ballpoint pen refill 1a Ballpoint pen refill 2 Front joint 2a Front shaft part 2b Rear shaft part 3 Rear joint 3a Front cylinder part 3b Bendable part 3c Rear shaft part 4 Fin 5 Rib 6 Ink distribution pipe 6a Ink distribution hole 7 collar part 8 Valve chamber 8a Groove 9 Ball receiving seat 10 Lead hole 11 Inner hole portion 12 Chip 13 Tip ball 14 Shaft portion 15 Spring 16 Rod shaft portion 17 Ball valve 18 Ink storage tube 19 Ink 20 Follower 21 Follower rod 22 Tail plug 23 Venting groove 24 Shaft portion 24a Locking groove 30 Ball pen refill 31 Ink receiving tube 32 Joint 33 Bendable portion 34 Valve chamber 40 Shaft cylinder 41a Ball pen refill 41b Ball pen refill 42 Shaft cylinder 43a Ball pen refill 43b Ball pen refill 43c Ballpoint pen refill 44 Shaft cylinder 45a Ballpoint pen 45b Ballpoint refill 45c Ballpoint pen refill 45d Ballpoint pen refill 46 Shaft cylinder 47a Ballpoint pen refill 47b Ballpoint pen refill 47c Ballpoint pen refill 47d Ballpoint pen refill 48 Shaft cylinder 49a Ballpoint pen refill 49b Ballpoint pen refill 49c Ballpoint pen refill 49d Ballpoint pen refill 49d Refill 49e Ballpoint pen refill 49f Ballpoint pen refill

Claims (3)

A ballpoint pen refill that is equipped with a ballpoint pen refill for a ballpoint pen refill that houses multiple ballpoint pen refills and allows each writing tip to be selectively projected and retracted from the shaft tip. Has a substantially polygonal cross section, and the refill of the ballpoint pen has a tip for holding the tip ball, a joint and an ink storage tube behind the tip, and the ink storage portion of the ink storage tube is not deformed. The cross section is substantially polygonal, and each is substantially densely mounted in a state where it can be moved back and forth independently in the shaft cylinder, and the portion connecting the joint and the ink storage portion is in the axial length direction. A refill of a ballpoint pen provided with a bendable portion that can be easily changed in the lateral direction. The refill of the ballpoint pen consists of a spring provided so that the tip ball is always pressed and in close contact with the inner edge of the ball holding portion at the tip of the tip, and is released so that the close state is released during writing. Water-based ballpoint pen ink with so-called shear thinning or low-viscosity oil-based ink that flows out with reduced viscosity due to rotation of the tip ball accompanying writing is filled, and furthermore, ink consumption due to writing is consumed at the rear end of the ink The refill of the ball-point pen according to claim 1, wherein the ballpoint pen is filled with a follower made of a grease-like translucent non-drying material that moves following the movement. There is provided a valve chamber in which a ball valve is loosely fitted in the axial center portion of the joint in contact with the rear end of the chip, and the ball valve is in close contact with the rear portion of the valve chamber to prevent backflow of ink and the ball receiving seat The refill of the ballpoint pen according to claim 2, further comprising a guide hole that communicates with the ink storage tube.

Images