JPH11115378A - Ballpoint pen of double writing-tip type - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve a handling convenience by charging white pigment ink in an ink chamber rear of a first ballpoint pen at a front end of a barrel, providing a follower following up the ink at its rear end, incorporating a second ballpoint pen refill having a long axis in a bore of an inner cylinder, and exposing the chip from a rear end of the barrel. SOLUTION: An inner cylinder 1c closed at its rear end is provided from a rear end of a rear cylinder 1b of a barrel 1 toward a bore (ink chamber) 1g, and its inner periphery is integrally connected to a rear end inner periphery of the cylinder 1b via a rib 1e of a predetermined position. Then, white pigment ink 9 is charged in the bore 1g, and grease-like follower 10 following up the ink in contact with an ink surface is charged in its rear end. Further, a rear part of a ballpoint pen refill 16 having a long axis is engaged with the bore 1g of the cylinder 1c. And, a mouth tip 15a for holding its tip 6 is integrally formed, and then a barrel 15 is detachably clamped at an outer periphery of the cylinder 1b of the barrel 1. Thus, the refill having the long axis can be carried, and its handling convenience can be improved.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention has a tip of a ball-point pen for correction of typographical errors filled with white gel ink at the tip of a barrel, and a writing tip of a ball-point pen for writing at the rear end of the barrel. And a so-called double-headed ball-point pen.

[0002]

2. Description of the Related Art Conventionally, there has been known a liquid applicator using a white pigment for correcting erroneous characters and the like. This type of liquid applicator is such that ink and balls are sealed in a flexible container because the white pigment and the solvent are easily separated.
When used, it is necessary to shake and stir. Further, the ink is ejected by pressing the side surface of the container. However, when the remaining amount of the ink becomes small, even if the side wall of the container is strongly pushed, the ink is not ejected. Further, the tip of the application is sealed with a cap so as not to dry.

Recently, a ballpoint pen for water-based ink called medium viscosity using an ink having an intermediate viscosity region between water and oil (several mPa · S to several thousand mPa · S) has been developed.
This is a ballpoint pen using a relatively low-viscosity water-based ink having a characteristic of lowering the viscosity by the rotation of the tip ball and smoothly flowing out the ink, that is, a so-called shear thinning property. In addition, low-viscosity inks such as medium-viscosity water-based inks and low-viscosity oil-based inks all have low viscosities, and therefore have a phenomenon in which the ink easily flows backward or direct current. If the ink causes backflow or direct current, there is a risk of soiling clothes and the like. In addition, there is a drawback that handwriting is apt to occur due to drop or knock impact. A medium-viscosity aqueous ballpoint pen is usually filled with a grease-like translucent non-drying substance called a follower at the rear end of the ink storage tube. It can be considered that evaporation from the gap with the ball holding portion is reduced. It is known that a shaft cylinder is provided with two types of writing at both ends.

[0004]

In a conventional writing implement having two types of writing bodies at both ends of a shaft cylinder, one of the writing bodies is short because the total length of the shaft is long. Therefore, there is a drawback that the writing life is short, and there is a problem that it is difficult to obtain in the market due to a special writing type. An object of the present invention is to provide a convenient double-headed ball-point pen equipped with a ball-point pen for correcting a typographical error that does not require agitation along with solving the problem and does not have to bother pressing the side of the container. Also, it is possible to provide a convenient ballpoint pen that can easily change the application width while correcting a typographical error. To enable coarse and fine correction.

[0005]

The present invention has the following arrangement to achieve the above object. The double-headed ball-point pen according to the first aspect of the present invention is a double-headed ball-point pen having a first ball-point pen at a front end and a second ball-point pen at a rear end. Ballpoint pen tip, white pigment containing at least a white pigment such as titanium oxide, polymer hollow fine particles and a gelling agent in the ink chamber at the rear and preventing the sedimentation of the pigment and preventing the fluidity from being impaired A follower is provided which is filled with ink, and which is moved at the rear end of the ink to follow the consumption of the ink during writing, and which has a rear end closed from the rear end of the barrel toward the front of the ink chamber. A heavy cylindrical inner cylinder portion is provided, and the inner cylinder portion is joined to the shaft cylinder by a rib at a required portion provided anywhere between the rear end inner periphery of the shaft cylinder and the rear end outer periphery of the inner cylinder portion. And the rear end of the barrel from the ink chamber between the ribs Penetrating vent is formed, further, the rear portion of the second ball-point pen refill is accommodated in the inner hole of the inner cylindrical portion, the ballpoint pen tip is provided exposed on the rear end of the barrel.

A double-headed ballpoint pen according to a second aspect of the present invention is the double-pointed ballpoint pen according to the first aspect, wherein the first ballpoint pen has a plurality of ballpoint pen tips fixed to the tip via a holder. Become composed.

According to a third aspect of the present invention, there is provided a double-headed ball-point pen according to the first and second aspects, wherein a spring is inserted into a tip inner hole of the first ball-point pen. Is provided so that it cannot be pulled out from the rear end of the tip, and presses the rear end of the tip ball rotatably held at the tip end of the tip with the tip of the spring, and the tip ball comes into close contact with the inner edge of the ball holding portion of the tip. Become composed.

A double-headed ballpoint pen according to a fourth aspect of the present invention is the double-headed ballpoint pen according to the third aspect, wherein a joint is fixed to a tip of a barrel, and a tip is further attached to a tip of the joint. A valve chamber and a guide hole are provided at the shaft center of the joint so as to communicate with the ink chamber from the tip end of the joint, a ball valve receiving seat is formed at the rear end of the valve chamber, and a ball valve is provided in the valve chamber. It is provided with a backflow prevention mechanism for ink provided such that the ball valve is loosely fitted and the ball valve is in close contact with the ball valve receiving seat when the tip is upward, so that the ball valve seals the guide hole.

[0009]

1 to 3 show a first embodiment of the present invention. The shaft cylinder 1 is a resin molded product (usually a transparent resin). A front cylinder 1a is formed in front of the flange 1h and a rear cylinder 1b is formed in the rear. An inner hole 1g (ink chamber) is formed from the rear end of the rear cylinder 1b. Becomes
Double cylindrical inner cylinder 1c with its rear end closed toward the front
Are integrally joined with a required portion of a rib 1e between an inner periphery of a rear end of the rear cylinder portion 1b and an outer periphery of the inner cylinder portion 1c. Vent 1 penetrating the edge
f is formed. It is also possible to form the inner cylinder part 1c as a separate body, provide a rib at a required portion on either the inner periphery of the rear cylinder part 1b or the outer periphery of the inner cylinder part 1c, and join them together.

The front joint 2 is formed of a resin molded product having a tapered outer peripheral portion at the front and an inner hole 2a at the tip and a shaft portion 2b integrally at the rear. A required number of ribs 2c are provided on the peripheral wall at the front end of the inner hole opened at the rear end of the shaft portion 2b, and a gap (hole) is formed between the ribs.

The rear joint 3 has a shaft portion 3b at the rear, an inner hole 3a formed at the tip, and a tapered or spherical ball valve receiving seat 3c and a ball valve at the rear end of the inner hole 3a. A conducting hole 3d communicating with the inner hole 1g of the shaft cylinder 1 behind the receiving seat 3c.
Are formed.

On the other hand, the tip 6 is caulked so that the tip ball 7 is rotatably held with the tip ball 7 substantially in contact with a seat having a channel into which ink can flow. The spring 8 is inserted into the inner hole of the chip, and the rear end of the shaft portion at the rear of the chip is appropriately caulked (caulked portion 6a) so that the rear end of the spring 8 cannot be pulled out. Further, a linear rod 8a is formed in front of the spring 8, and the distal end of the rod 8a abuts against the rear surface of the tip ball 7 in a pressing manner. The tip ball 7 is brought into close contact with the inner edge of the ball holding portion (formed by caulking or the like) of the chip 6 by the pressing. The tip 6 is fixed to the inner hole 2a of the front joint 2.

A shaft portion 2b behind the front joint 2 is press-fitted into an inner hole 3a at the end of the rear joint 3 to form a valve chamber 4 therebetween. At this time, the ball valve 5 is loosely fitted in the valve chamber 4. Further, the shaft portion 3b of the rear joint 3 is fixed to the inner hole of the front tube portion 1a of the shaft tube.

A white pigment ink 9 is filled in the inner hole 1g of the barrel 1 and a grease-like follower 10 is provided at the rear end of the ink 9 so as to come in contact with and follow the ink surface as the ink is consumed. Will be filled. A follower 11 made of resin having a specific gravity substantially equal to that of the follower 10 is immersed in the follower 10. The driven body 11 may be provided as necessary (in the case where the cross-sectional diameter of the ink storage portion is large and the ink head is large. In addition, the ink viscosity is so low that the ink head cannot be supported or the follower is easily deformed by impact. Etc.). As described above, when the tip side is downward, the ball valve 5 comes into contact with the rear end of the rib 2c, and the ink flows into the tip inner hole through the guide hole 3d and the valve chamber 4, and is guided to the back of the tip ball 7. Thus, the first ballpoint pen is configured.

The ink 9 contains at least a white pigment such as titanium oxide and hollow polymer particles and a gelling agent.
It is a white pigment ink formulated to prevent sedimentation of the pigment and not to impair the fluidity. The viscosity of the ink is 10,000 cps (E-type viscometer, 1 rpm, 25 rpm).
° C) or less, there is a tendency for pigment settling, and
If it is 0 cps or more, a problem occurs in ink ejection. Therefore, the viscosity of the ink is set in the middle range, and although it has a high viscosity, it has a shear thinning property, so that the coating can be applied with a high concealing property in combination with the decrease in the viscosity by the rotation of the tip ball. In addition, the ballpoint pen for correcting typographical errors is set to have a large discharge amount in order to increase the hiding power by application, and the gap between the tip ball and the inner surface of the ball holding portion of the chip is compared with a ballpoint pen for writing. Slightly larger. Also, since the ink consumption is large, the cross-sectional diameter of the ink storage section may be large, so that even with high-viscosity ink, direct current or backflow of the ink cannot be ignored.

In the above embodiment, if only the spring 8 for pressing the back surface of the tip ball 7 is provided in the inner hole of the chip 6, the direct current and the backflow of the ink are normally prevented. However, when the upward writing is repeated or the close contact between the tip ball and the inner surface of the ball holding portion of the chip is incomplete (contamination of foreign matter, deformation due to external force), a backflow phenomenon occurs, and the coating becomes impossible at last. There is a possibility that the ball valve 5 is provided in the valve chamber 4 as a preventive means.

Further, in the embodiment, the front joint 2
Although it is provided with the rear joint 3, it is possible for convenience of design, and it is also possible to configure it integrally. Further, the joint and the barrel 1 may be integrally formed. In this case, it is necessary to separately attach the above-described inner cylinder portion 1c to the shaft cylinder 1 for ink filling and the like.

On the other hand, a rear portion of an oil-based ballpoint pen refill 16 serving as a second ballpoint pen which is easily available on the market is fitted into the inner hole 1d of the inner cylinder portion 1c. The inner hole 1d
An engaging portion for fitting and holding the ball-point pen refill 16 as appropriate, a groove or a step portion for air replacement, and the like are formed on the peripheral surface and the front end. (Not shown)

The ball-point pen refill 16 is provided at the rear end.
A rear barrel 15 integrally formed with a lip portion 15a for projecting and holding the tip is detachably fixed to an outer peripheral portion of a rear barrel portion 1b of the barrel. (Providing an appropriate engaging portion between each other)
Also, the rear cap 17 is detachably attached to the outer periphery of the lip portion 15a.
Is fixed. Further, a tip ball 7 is provided on the front tube portion 1a of the shaft tube.
The front cap 12 provided with the plug 14 for sealing is detachably fastened. The second ballpoint pen refill may be a low-viscosity oil-based ballpoint pen or an aqueous or oil-based medium-viscosity ballpoint pen.

FIG. 4 shows a second embodiment of the present invention. As shown in the figure, a shaft portion 20d having a screw portion on the outer periphery at the rear end of the shaft tube 20 and an inner cylindrical portion 20b having a double cylindrical shape are formed integrally toward the front of the inner hole of the shaft tube. . The ball-point pen refill 16 is fitted into the inner hole of the inner cylindrical portion 20b, and the tip 21 is detachably fastened to the shaft portion 20d in a state where the tip protrudes.

FIG. 5 shows a third embodiment of the present invention. First, as shown in the drawing, this embodiment has two types of chips 32 and 32a. Although it is possible to use two or more types of chips, three types are suitable from the viewpoint of convenience. The configuration is almost the same as that of the first embodiment described above, and the differences will be described below.

The front joint 30 is formed of a resin molded product having a tapered outer peripheral portion at the front and a shaft portion 30b integrally at the rear. A required number of ribs 30c are provided on the peripheral wall in front of the inner hole opened at the rear end of the shaft portion 30b, and a gap (groove) is formed between the ribs. Further, the shaft portion 30b is crimped to the inner hole 3a at the tip of the rear joint 3, so that the valve chamber 37 is formed between the shaft portions 30b. At this time, the ball valve 5 is loosely fitted in the valve chamber 37.

On the other hand, the tip 32 is caulked so that the tip ball 33 is rotatably held with the tip ball 33 substantially in contact with a seat having a channel into which ink can flow. The tip 32 is in the shape of a pipe, and the above-mentioned channel is obtained by forming an inward bulge with three punches on the side.
The chip 32a has the same configuration. Note that the tip may be a bullet-shaped tip, but a pipe with a small diameter is suitable in terms of space.

Each chip is disposed inside a cylindrical holder 31, and is tightly inserted and fixed via a partition 31a provided inside the holder 31. The holder 31
And the partition part 31a can also be formed integrally.
The partition portion 31a is provided for closely inserting each chip into the holder 31 and for providing each chip at an appropriate interval that does not interfere with writing. Above,
The holder 31 is fixed to the inner hole 30a of the front joint 30. Although the holder 31 can be formed integrally with the front joint 30, it is appropriate to form the holder 31 separately since the structure of the front joint becomes complicated.

Also, in the embodiment, the ball valve seat 3
c with a front joint 3 and a front joint 3 with a rib 30c
The valve chamber 37 is formed by joining with the
If a receiving surface similar to the rib 30c is formed at the rear end of the front joint 30, a ball valve receiving seat similar to the ball valve receiving seat 3c and a conductive hole similar to the conductive hole 3d are formed at the rear end of the shaft portion 30b of the front joint 30. It can be formed integrally, and the rear joint 3 can be omitted.

A small-diameter spring 38 is inserted into each of the chip inner holes 34 as necessary. The spring 38 is provided such that the rear end thereof cannot be pulled out by abutting the rear end of the step portion 31b provided on the holder 31 or by caulking the rear end of the shaft portion 35 of the chip 32. A linear rod 39 is formed in front of the spring 38, and the tip of the rod 39 is pressed against the rear surface of the tip ball 33.
Further, the tip ball 33 is brought into close contact with the inner edge of the ball holding portion of the chip by the pressing. Therefore, the problem of direct bleeding of the ink downward from the tip ball 33 downward is prevented. It should be noted that a top having a rod shaft portion at the tip may be provided at the front end of the spring.

The close contact of the tip ball 33 with the inner surface of the ball holding portion of the chip is extremely important for drying the writing tip and preventing direct current of the ink even if the ink has a high viscosity. (In order to increase the amount of ink ejected, the retreat dimension of the tip ball is set larger than that of a medium viscosity ballpoint pen.) Surface roughness of the tip inner surface holding the tip ball 33, close contact accuracy by caulking Grinding of the inner surface to improve the quality and secondary plastic working to improve the caulking accuracy are considered.
In addition, a surface treatment or the like is taken into consideration for the surface in close contact with the tip ball.

[0028]

The construction of the present invention has been described above. The first ball-point pen and the second ball-point pen refill are accommodated doubly because the shaft cylinder has a double cylindrical inner cylinder portion toward the front of the inner hole. This makes it possible to mount a commercially available (long) ball-point refill with a shaft length that is easy to use and easily available.

FIG. 3 shows a first ball-point pen in the first embodiment. FIG. 3 shows a state in which the tip 6 is turned upward. At this time, the ball valve 5 is mounted on the ball valve seat 3 of the valve chamber 4.
Since the guide hole 3d is closed in close contact with c, the ink does not flow backward even if the ink on the back surface of the tip ball 7 is exhausted by upward application. Therefore, when the tip 6 is turned downward, the ink can immediately flow out, thereby preventing the ink from running out during the coating operation. (By the way, in the structure without the ball valve, the ink head acts in the backward flow direction in the upward application, so that air is entrapped in the chip, and the ink does not immediately follow in the downward application. Is gradually accumulated)

In the state before the application with the chip 6 facing downward, the ball valve 5 comes into contact with the front end of the rib 2c in the valve chamber, and the conducting hole 3d is opened. 3d guide hole from ink storage
The ink 9 that has entered the valve chamber 4 through the groove flows into the inner hole of the chip through the groove formed between the ribs, and is guided to the back of the tip ball 7. In this state, the tip ball 7 is brought into close contact with the inner edge of the chip holding portion by the pressing of the rod shaft portion 8a of the spring 8, so that the direct current of the ink 9 is prevented. In addition, the tip ball 7 is slightly retracted by the application pressure, so that a gap is generated and ink can flow out, and the rotation of the tip ball 7 lowers the viscosity of the ink to smoothly flow out and correct a typographical error. Becomes

A channel (a receiving seat for the tip ball having a plurality of ink inflow grooves penetrating toward the inner hole of the chip) is provided on the back surface of the tip ball 7, and a rod shaft of the spring 8 is provided in the center hole of the channel. The portion 8a penetrates. The ink in the chip is guided to the back surface of the tip ball 7 through the ink inflow groove and the gap between the center hole and the rod 8a.

Further, since the tip ball 7 is always in close contact with the inner edge of the tip holding portion, the writing at the tip portion is prevented from being scribbled. Further, even if upward writing or impact is repeatedly applied by the cooperative action of the tip ball 7 and the ball valve 5, the entrainment of air is alleviated, so that writing blur is prevented. The direct current and the backflow of the ink are achieved by the pressing of the tip ball 7 by the spring 8. The spring 8 is provided to complement the incomplete state when solid matter adheres to the gap of the ink, to support the large ink head to reliably prevent the backflow of the ink, and to alleviate the air entrapment (prevent the rake). Collaborate with

In the first ball-point pen according to the third embodiment, if it is desired to change the coating width during writing,
Rotate the grip position to select the required chip. A mark or the like indicating the selected position is provided on the front joint 30 or the outer peripheral portion of the front end of the barrel 1 so as to be easily selected.

[0034]

The construction and operation of the present invention are as described above, and a commercially available ballpoint pen refill having a long writing life can be mounted with an easy-to-use shaft length. A convenient double-headed ball-point pen with a correction ball-point pen can be provided. Further, by using a white gel-like ink for the ballpoint pen for correcting a typographical error, there is no problem that the white pigment and the solvent are separated as in the prior art, and therefore there is no need to stir the ink. In addition, it is possible to provide a ballpoint pen for correcting erroneous characters that does not bother pressing the side surface of the container when correcting erroneous characters. In addition, backflow and direct current of ink are prevented, and accidents that stain hands, clothes, and the like are prevented. In addition, the ink can immediately follow after upward writing or impact. Also, by combining chips for bold and fine characters,
By changing the grip position, it is possible to easily correct a large portion and a small portion.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing a first embodiment of the present invention, and is partially non-sectional.

FIG. 2 is a perspective view showing part development in the first embodiment.

FIG. 3 is an enlarged cross-sectional view of a main part of a tip portion of a first ballpoint pen in the first embodiment.

FIG. 4 is a longitudinal sectional view of a main part of the rear showing the second embodiment, and is partially non-sectional.

FIG. 5 is an enlarged cross-sectional view of a main part of a tip portion of a first ball-point pen according to a third embodiment.

[Explanation of symbols]

 Reference Signs List 1 shaft cylinder 1a front cylinder 1b rear cylinder 1c inner cylinder 1d inner hole 1e rib 1f ventilation hole 1g inner hole 1h flange 2 front joint 2a inner hole 2b shaft 2c rib 3 rear joint 3a inner hole 3b shaft 3c Ball valve receiving seat 3d Guide hole 4 Valve chamber 5 Ball valve 6 Tip 6a Caulking part 7 Tip ball 8 Spring 8a Bar shaft part 9 Ink 10 Follower 11 Follower 12 Front cap 12a Inner cylinder part 12b Vent hole 12c Clip 13 Inner cap 14 Plug body 15 Rear barrel 15a Mouth 16 Ball-point pen refill 17 Rear cap 20 Shaft barrel 20a Rear barrel 20b Inner barrel 20c Vent hole 21 Mouth 22 Rear cap 30 Front joint 30a Inner hole 30b Shaft 30c Rib 31 Holder 31a Partition Part 31b step part 31c guide hole 32 chip 32a chip 33 L 34 Tip bore 35 Shaft 36 Caulking 37 Valve chamber 38 Spring 39 Rod shaft

Claims (4)

[Claims] 1. A first ballpoint pen at the front and a second ballpoint at the rear.
In the double-headed ball-point pen provided with the ball-point pen, a tip of the first ball-point pen is provided in front of the barrel, and at least a white pigment such as titanium oxide and polymer hollow fine particles and a gelling agent are provided in the rear ink chamber. It is filled with white pigment ink formulated to prevent sedimentation of the pigment and not to impair the flowability, and a follower is provided at the rear end of the ink that moves in accordance with the consumption of ink accompanying writing. Further, a double-cylinder inner cylinder portion having a rear end closed toward the front of the ink chamber from the rear end of the shaft cylinder is provided, and the inner cylinder portion includes a rear end inner periphery of the shaft cylinder and an inner cylinder portion. A rib at a required portion provided anywhere in the rear end outer periphery is joined to the barrel, and a ventilation hole penetrating from the ink chamber to the rear end of the barrel is formed between the ribs. And a rear portion of the second ballpoint pen refill in an inner hole of the inner cylinder portion. Wherein the tip of the ball-point pen is exposed at the rear end of the barrel. 2. The double-headed ball-point pen according to claim 1, wherein the first ball-point pen has a tip of a plurality of ball-point pens fixed to a tip thereof via a holder. 3. A tip ball in which a spring is inserted into a tip inner hole of the first ball-point pen so that the spring cannot be pulled out from a rear end of the tip, and is rotatably held at a tip end of the tip by a tip of the spring. 3. The double-headed ball-point pen according to claim 1, wherein a rear end of the ball-point pen is pressed so that a front end ball comes into close contact with an inner edge of a ball holding portion of the chip. 4. A joint is fixed to the tip of the shaft cylinder, a tip is fixed to the tip of the joint, and a valve chamber and a guide hole are provided at the joint center so as to communicate from the tip rear end to the ink chamber. And
A ball valve seat is formed at the rear end of the valve chamber, and the ball valve is loosely fitted in the valve chamber. When the chip is upward, the ball valve is in close contact with the ball valve seat and the ball valve seals the guide hole. 4. The double-headed ballpoint pen according to claim 3, further comprising an ink backflow prevention mechanism provided as described above.