JP2002019373A - Ball point pen - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a ball point pen which can use an ink which is easily clogged and can correct mainly an error in writing, etc., by hiding them with a white ink. SOLUTION: In the ball point pen in which the apex of a tip is positioned so as to be projected from the apex of a shaft cylinder 1, a tip 4 has an apex ball 5 on the apex and has an idle member 7 being brought into contact with the back face of the apex ball and a spring 9 for pressing forward the idle member being brought into contact with the back face is arranged and the apex ball is brought into close contact with the inner edge of a ball holding part of the apex of the tip. In addition, in the rear of an ink storing pipe, a knock cylinder being freely stretchable at least in the shaft direction is provided and a venting hole is opened on the back end of the knock cylinder and a venting path from the venting hole to the back end of the follower is formed and by shrinking the knock cylinder under a condition that the vent hole is closed, the back end of the follower is pressed and fluidity of the ink to the tip side is supported.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to an ink which is easy to dry,
Ballpoint pens made with ink that easily runs out of ink in initial writing, ink that easily separates pigments and solvents, ink that easily clogs with various fillers, etc., mainly erroneous writing can be corrected by concealing with white ink And improvement of ballpoint pens and the like.

[0002]

2. Description of the Related Art Conventionally, there has been known a liquid applicator using a white pigment in order to correct a mistake or the like. In addition, since a white pigment and a solvent are easily separated from each other, this type of liquid applicator has a flexible container in which ink, balls, and the like are sealed, and it is necessary to shake and agitate the liquid applicator before use. 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, in the case of the ballpoint pen type, there is a problem that the ink is solidified by drying and the leading end of the coating is easily clogged, and it takes time and effort to return to the normal state. In addition, inks that have high viscosity and do not easily flow out, inks that are easily solidified such as glue,
Writing implements using inks or the like mixed with metal powder or various microscopic film pieces have the same problems as the above-mentioned applicators.

[0003]

SUMMARY OF THE INVENTION The present invention mainly provides a ballpoint pen-type applicator (writing implement) for correcting errors such as erroneous writing which does not need to be agitated and does not bother pressing the side of the container. Another object of the present invention is to solve the above-mentioned problems of a ballpoint pen-type writing instrument using ink which is easily clogged with various fillers.

[0004]

The present invention has the following arrangement to achieve the above object. In the ballpoint pen according to the first aspect of the present invention, a ballpoint pen refill having a tip of a ballpoint pen and an ink storage tube behind the tip of the ballpoint pen is mounted in the barrel so that the tip end protrudes from the tip of the barrel. In the ball-point pen positioned at the front end, the tip has a tip ball at the front end, has an idle member which abuts on the back surface of the tip ball at the tip bore, and directly or slidably receives on the back surface of the idle member. A spring that presses the idle member forward through the member is provided so that the tip ball is in close contact with the inner edge of the ball holding portion at the tip of the tip, and at least axially expands and contracts behind the ink storage tube. A free knock tube is provided, a vent hole is opened at the rear end of the knock tube, and a ventilation path from the vent hole to the rear end of the follower is formed, and the vent hole is closed. The rear end of the follower is pressurized by shrinking the knock sleeve, the fluidity of the chip side of the ink is configured to be assisted.

In the ballpoint pen according to the second aspect of the present invention, a ballpoint pen refill having a tip of a ballpoint pen at the tip and an ink storage tube at the rear thereof is mounted in the barrel, and the tip of the tip extends from the tip of the barrel. In a ballpoint pen that is positioned so as to protrude, the tip has a tip ball at the front end, has an idle member that abuts the back surface of the tip ball at the tip bore, and a spring that presses the idle member forward. The tip ball is disposed so as to be in close contact with the inner edge of the ball holding portion at the tip end, and a valve chamber is provided behind the tip where a valve body is loosely fitted, and the rear end of the valve chamber communicates with the ink storage section. The guide hole of the ink is provided, the valve body closes the guide hole in the upward direction of the chip, and the backflow of the ink can be prevented. A vent is formed at the rear end of the knock cylinder, a ventilation path is formed from the vent to the rear end of the follower, and the follower is contracted by closing the knock cylinder with the vent closed. The rear end is pressurized to support the flow of the ink toward the chip.

A ballpoint pen according to a third aspect of the present invention is the ballpoint pen according to the first or second aspect, wherein the ink containing tube contains at least a white pigment such as titanium oxide and polymer hollow fine particles and a gelling agent. It is filled with a white pigment ink which is contained so that sedimentation of the pigment is prevented and fluidity is not impaired as much as possible.

[0007]

1 to 4 show a first embodiment of the present invention. As shown in the figure, a white pigment ink 11 is filled in an ink storage tube 10 of a ballpoint pen refill 2, and a grease-like follower 12 that follows the ink as the ink is consumed is filled in the rear end of the ink. In addition, the follower is not compatible with the ink and has a function of preventing the evaporation of the ink. If necessary, a resin follower rod 13 having a specific gravity substantially equal to that of the follower is immersed in the follower. The follower may be a follower such as a silicone rubber.

The white pigment ink 11 contains at least a white pigment such as titanium oxide and hollow polymer fine particles and a gelling agent, and is formulated so as to prevent sedimentation of the pigment and to minimize the loss of fluidity. It is a white pigment ink. or,
Since the ink has a shear thinning property, the ink can be applied with a high concealing property in combination with a decrease in the viscosity as the tip ball rotates. Further, as described above, it is possible to use, as the ink, an ink having a high viscosity, which is hard to flow out, an ink which is easily solidified such as a paste, an ink in which metal powder, various microscopic film pieces, and the like are mixed.

The joint 3 has a front shaft portion 3a formed in front of a flange portion 3b and a rear shaft portion 3c formed in the rear, and a tip 4 is fixed to a hole at the tip of the front shaft portion 3a. Further, a rib 3d is formed at a required position on the outer periphery of the front shaft portion 3a.

As shown in FIG. 2, the tip 4 has a tip portion having an appropriately reduced diameter via a tapered step portion 4b at the front of the cylindrical body, and the inner edge of the ball holding portion 4a at the front end of the inner hole. Are formed so as to be in liquid-tight contact with the tip ball 5.
Further, a ball-shaped idle member 7 is provided in contact with the back surface of the tip ball 5, and the idle member 7 is provided so that a gap 6g serving as an ink flow path is formed facing the inner surface of the step portion 4b. ing. The idle member 7 is usually formed in a ball shape, but may be formed in a shaft shape.

Further, the tip 4 has a seat portion 6b abutting against the back surface of the idle member 7, a channel portion 6a through which ink can flow, and a valve mechanism with the tip of the tip facing upward to seal the ink guide hole. A receiving member 6 which is integrally provided is provided, and a spring 9 is provided at a rear end of the receiving member 6 so that the receiving member 6 can retreat in conjunction with the tip ball 5 by pressing of the tip ball 5 accompanying a writing operation. It is configured so that

The valve mechanism will be described in detail. The receiving member 6 has a groove-shaped channel portion 6a formed at a required position at the front end, and a valve chamber 6f provided at an axial center portion. A stepped portion 6c is formed at the front end of the valve chamber 6f, and a tapered or spherical valve body receiving seat 6d is formed at the rear end, and a conducting hole 6e extends through the valve body receiving seat 6d. And valve room 6f
A receiving member 6 is formed by loosely fitting a spherical valve body 8 (a shape other than a spherical body is also acceptable) therein. Further, as shown in the figure, since the step portion 6c is provided in a state of being engaged with the groove of the channel portion 6a, the valve body 8 can be easily inserted into the valve chamber 6f by elastic deformation.

By the way, the fact that the valve body 8 cannot be pulled out is because the valve mechanism is normally incorporated into the chip.
This is because it is desirable that the valve element 8 be loosely fitted in the valve chamber 6f of the receiving member 6 in advance. This is necessary when the valve body has an axial shape or the like because the valve body is easily inclined. When the valve body is ball-shaped, the valve body can be inserted into the valve chamber by inserting the receiving member without extremely interfering with the one side of the chip inner hole. Therefore, the step 6c for making the valve body unable to be pulled out is not always necessary. In addition, the valve mechanism is more complicated than the above structure, but when the tip is downward, the membrane-like lid opens to allow ink to flow out, and when the tip is upward, the lid closes to prevent ink backflow And the like.

An engaging step 4c is formed on the inner surface of the rear end of the chip 4.
Is provided. The locking step 4c can be formed by various means depending on the design convenience such as the material of the chip 4 and the chip assembling process. The spring 9 is provided between the locking step 4c and the rear end 6h of the receiving member 6, the seat 6b of the receiving member 6 pressing the back surface of the idle member 7, and the idle member 7 Press the back of.

By the way, the tip ball 5 is attached to the ball holding portion 4.
Close contact with the inner surface of a is extremely important for drying the writing tip and preventing direct current of the ink even if the ink has a high viscosity. Therefore, especially in the case of a metal chip, the surface roughness of the inner surface of the chip holding the tip ball 5, the inner surface is ground to improve the close contact accuracy by caulking, and the secondary plastic working to increase the caulking accuracy is performed. Be considered. Also, if necessary, a surface treatment or the like may be considered on the surface in close contact with the tip ball.
In addition, the writing implement of the present application is set to have a larger retreat size of the tip ball than a normal writing ball-point pen in order to increase the amount of ink discharged and to eliminate clogging.

As described above, the rear shaft portion 3c extends behind the flange portion 3b of the joint 3. On the outer periphery of the rear shaft portion 3c, a cylindrical ink storage tube 10 is press-fitted and fixed with its leading end abutting on the rear end of the flange portion 3b, and the inner diameter portion of the ink storage tube 10 is electrically connected to the guide hole 3e of the joint 3. I have. In addition, a transparent PP resin molded product or the like is used as the ink storage tube 10 as an example. Further, in the ball-point pen of the above-described embodiment, the joint and the ink storage tube are formed as separate members, but both may be formed as an integral resin molded product.

The barrel 1 is a transparent resin molded product, and a base 1c is detachably screwed to a screw portion 1b provided on a shaft portion 1a at a front end, and a ballpoint pen refill 2 can be mounted from the front end of the barrel 20. It has been done. An engaging portion of the cap 16 formed of a protrusion and a groove is formed on the outer periphery behind the screw portion 1b, and a step portion 1d is formed in the inner hole. In addition, a step is formed at the rear end of the engaging portion so that the end of the cap 16 abuts.

FIG. 4 shows the rear half of the ballpoint pen according to the embodiment. The tail plug 14 has a shaft 14a having a wall 14e at the front end in front of the flange 14c, and a shaft 14b at the rear. The tail 14 has a wall 1 from the rear end of the shaft 14b.
A lateral hole 14f is formed in a side wall near the front end of the hole 14d opened to the inner surface side of 4e, and a vertical groove 14g communicating from the lateral hole 14f to the front end of the wall 14e is provided.

The tail plug 14 has a shaft portion 14a fixed to a rear end hole of the ink storage tube 10, and an outer peripheral portion of the shaft portion 14b.
A front portion of the knock tube 15 whose rear portion is at least axially expandable and contractable is fixed, and a rear end of the knock tube 15 is provided with a vent hole 1.
5a is opened and the follower 1 is inserted through the vent hole 15a.
2 is formed, and the rear end of the follower 12 is pressurized by pressing the rear end of the knock cylinder 15 in a state where the air hole 15a is closed, thereby contracting the knock cylinder. The liquidity to the chip side of 11 is supported.

The ball-point pen refill 2 is inserted from the front end of the barrel 1, the rear end of the flange 3 b of the joint 3 abuts on the front end of the barrel 1, and the base 1 c is screwed onto the outer periphery of the front end of the barrel. Rib 3d provided on the outer periphery of the joint 3
Is engaged with the step 1d of the base 1c, and the forward end of the chip 4 is projected from the tip end hole of the base 1c. Further, the rear end of the knock cylinder 15 protrudes from the rear end of the shaft cylinder 1.

The cap 16 to be fitted to the front of the barrel 1 is a transparent resin molded product having excellent elasticity, and a clip 18 is positioned on the outer peripheral side surface thereof, and the rear cylindrical portion 18a is press-fitted to the rear end hole. are doing. Further, a ventilation hole penetrates through the rear end of the cylindrical portion 18a. Further, a cylindrical inner cap 16a having a small chamber is provided behind the inner hole of the cap 16, and the inner cap is integrally connected to the inner hole of the cap by a required number of ribs. As described above, a ventilation path communicating from the cap insertion port to the ventilation hole is formed between the ribs, and provides a safe ventilation means in the event that an infant swallows the cap. Further, the cap 16 has two engagement portions of a ridge formed in the inner hole portion on the insertion side at separate and independent positions. Also, the inner cap 16
A seal stopper 17 made of a non-liquid-absorbing, non-continuous-cell elastic body is fixed to the distal end of the small chamber a, and the tip 4 and the base 1c are substantially closely fitted in the small chamber, and the tip ball 5 is sealed. It is appropriately pressed against the stopper 17.

FIGS. 5 and 6 show a second embodiment of the present invention. FIG. 5 is a diagram showing the first half of the ballpoint pen, and FIG.
The difference from Example 1 shown in FIG.
However, the present embodiment is different from the above-mentioned ball-point pen refill 2 in that the embodiment is different. As shown in FIG.
The front end of the cylindrical body has a tip portion appropriately reduced in diameter via a tapered step portion 22b.
The inner edge of “a” is formed so as to be in close contact with the tip ball 24 in a liquid-tight manner. A ball-shaped idle member 25 is provided in contact with the back surface of the tip ball 24. At this time, the idle member 25 is provided so as to face the inner surface of the step portion 22b to form a gap 22c serving as an ink flow path. ing. still,
The idle member 25 is usually formed in a ball shape, but may be formed in another shaft shape.

The tip 22 further includes an idle member 25.
A receiving member 23 having a seat portion 23d, a channel portion 23b through which ink can flow, and a guide hole 23c which opens at the rear end through the inner step portion 23a from the front end opening portion to the tip of the chip inside the chip inner hole portion. Fixed. At this time, a spring 26 is provided between the inner step portion 23a and the back surface of the idle member 25, and the tip ball 24 comes into close contact with the inner surface of the ball holding portion 22a of the chip via the idle member 25 by the spring 26. The tip ball 24 protruding from the front end of the chip by being pressed against the tip ball 24 during the writing operation
Of the idle member 25 comes into contact with the seat 23d of the receiving member.

In the joint 20, a valve chamber 20a is provided behind the tip 22, and a guide hole 20c is formed at the rear of the valve chamber 20a.
And a tapered or spherical valve element receiving seat 20b is formed. A spherical valve element 21 is provided in the valve chamber 20a.
Is loosely fitted, and the valve body 2 is
1 is in contact with the rear end of the receiving member 23 of the chip, and the ink flowing from the guide hole 20c flows into the chip inner hole through the notch 23e provided at a required location on the rear end of the receiving member 23. I have. Note that the valve body may be a shaft-like body having a tapered or spherical shape on the side close to the valve body receiving seat. The latter half of the ballpoint pen of the second embodiment is combined with the form shown in FIG.

FIG. 7 shows the rear half of a ballpoint pen according to a third embodiment of the present invention. Hereinafter, only differences from the above-described embodiment will be described. A seal portion 27a having a circumferential projection is formed on an inner hole wall near the rear end of the barrel 27, and the seal portion 27a is brought into close contact with the outer peripheral portion near the substantially rear end of the ink storage tube 29. ing. Also, the ink storage tube 29
With the rear end of the shaft cylinder 27 facing the rear end of the
2 is fixed, and a vent hole 32 a is provided at the rear end of the knockable tube 32 at the rear end thereof. In addition, the sealing portion can be provided on the outer peripheral portion of the ink storage tube, or another sealing member, for example, an elastic member such as rubber can be provided on the outer peripheral portion of the ink storage tube.

FIG. 8 shows the rear half of a ballpoint pen according to a fourth embodiment of the present invention. Hereinafter, only differences from the above-described embodiment will be described. A tube portion 34b provided at the front end of the knock tube 34 is closely fitted to the outer periphery of the rear end portion of the ink storage tube 29. The rear portion of the knock tube 34 projects from the rear end of the shaft tube 33, and the knock tube 34 expands and contracts. A vent 34a is provided at the rear end of the free rear portion.

FIG. 9 shows the rear half of a ballpoint pen according to a fifth embodiment of the present invention. This embodiment corresponds to the fourth embodiment.
It has almost the same configuration as that of the first embodiment, and does not have a follower rod in the follower 30.

The front portion of the ballpoint pen refill 28 shown in FIGS. 7 and 8 has the same shape as the ballpoint pen refill 2 or 19 shown in FIG. 1 or FIG. Also, the front half of the ballpoint pen corresponding to the rear half of the ballpoint pen shown in the third, fourth, and fifth embodiments can be combined with the rear half of the ballpoint pen shown in FIG. 1 or FIG.

[0029]

Next, the operation will be described below in accordance with the first embodiment. First, the rear end of the knock cylinder 15 is pressed by pressing the rear end of the knock cylinder 15 in a state where the ventilation hole 15a of the knock cylinder 15 is closed with a finger, and the rear end of the follower 12 is pressed by contracting the knock cylinder. Liquidity is supported. This has the effect of preventing the ink from separating from the peripheral surface of the tip ball due to drop impact and poor ink fluidity, etc. Become. Incidentally, the above-mentioned basic operation is described in the second and third embodiments.
The same applies to 4 and 5.

Next, the operation of the ballpoint pen refill 2 and the ballpoint pen refill 19 are basically the same, so that the ballpoint pen refill 2 will be described. In a state where writing (application) is not applied to the tip of the tip 4, since the tip ball 5 is brought into close contact with the inner edge of the ball holding portion 4 a of the tip by the pressing of the spring 9, the backflow of ink is prevented. I have. When the tip 4 is facing upward, the valve body 8 is in close contact with the valve body receiving seat 6d and seals the guide hole 6e. There is no backflow. Therefore, when the tip 4 is turned downward, the ink can immediately flow out. Incidentally, in a structure having no valve element, ink flows backward when writing upward. (Especially when the tip ball retreats greatly as in the present application, an extreme backflow occurs.)

The follower rod 12 is used when the ink container has a large diameter. That is, the grease-like or gel-like follower 12 has a problem that when the ink container tube has a large diameter, the ink container tube is easily deformed and broken by the influence of impact or the like. The rigidity can be increased by immersing a resin follower rod having a specific gravity substantially equal to that of the follower in the follower. The follower rod is effective when the ink storage tube has a large diameter and tends to flow backward, or when repeated upward application or impact is applied. The applicator is not necessarily needed because it is rarely used upward.

The tip 4 has a considerably large diameter because the valve element 8 is loosely fitted to the axis of the receiving member 6 which slides in the inner hole of the tip. By providing the member 7, the tip ball 5 can be set to an appropriate size, and a writing instrument having a required drawing line width can be selected. Also, in the event that the tip ball 5 falls off due to severe use or some accident, it is possible to prevent an accident in which the idle member 7 comes into close contact with the inner surface of the step portion 4b of the chip and directs ink.

[0033]

The present invention is as described above. A white pigment is prepared by using an ink containing a white pigment and a gelling agent so as to prevent sedimentation of the pigment and not to impair the fluidity. There is no problem that the solvent and the solvent are separated, and therefore, there is no need to stir the ink. Become. In addition, a ballpoint pen-type writing instrument using ink that dries easily, ink that is easily clogged with various fillers, and the like can be provided without any problem.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing a first half of a ballpoint pen according to a first embodiment, showing a state in which a cap is fitted to a front end of a barrel.

FIG. 2 is a sectional view of a chip used in the first embodiment.

FIG. 3 is a cross-sectional view showing a state in which the chip shown in FIG. 2 faces downward.

FIG. 4 is a sectional view showing a rear half of the ballpoint pen according to the first embodiment.

FIG. 5 is a cross-sectional view showing a front half of a ballpoint pen according to a second embodiment, and shows a state in which a cap is fitted to a front end of a barrel.

FIG. 6 is a sectional view of a chip used in a second embodiment.

FIG. 7 is a sectional view showing a rear half of a ballpoint pen according to a third embodiment.

FIG. 8 is a sectional view showing a rear half of a ballpoint pen according to a fourth embodiment.

FIG. 9 is a sectional view showing a rear half of a ballpoint pen according to a fifth embodiment.

[Explanation of symbols]

 Reference Signs List 1 shaft cylinder 1a shaft portion 1b screw portion 1c base 2 ballpoint pen refill 3 joint 3a front shaft portion 3b flange portion 3c rear shaft portion 3d rib 3e guide hole 4 chip 4a ball holding portion 4b step portion 4c locking step portion 5 tip ball Reference Signs List 6 receiving member 6a channel portion 6b seat portion 6c step 6d valve body receiving seat 6e guide hole 6f valve chamber 6g gap 6h rear end portion 7 idle member 8 valve body 9 spring 10 ink storage tube 11 ink 12 follower 13 follower rod 14 tail Plug 14a Shaft 14b Shaft 14c Flange 14d Hole 14e Wall 14f Side Hole 14g Vertical Groove 15 Knock Cylinder 15a Vent 16 Cap 16a Inner Cap 17 Seal Plug 18 Clip 18a Tube 19 Ball Pen Refill 20 Joint 20a Valve 20a Valve body receiving seat 20c Guide hole 21 Valve body 22 Chip 2a ball holding portion 22b step portion 22c gap 23 receiving member 23a inner step portion 23b channel member 23c guide hole 23d seat portion 23e notch 24 tip ball 25 idle member 26 spring 27 shaft cylinder 27a seal portion 27b rear end hole 27c inner step 28 Ballpoint pen refill 29 Ink storage tube 30 Follower 31 Follower rod 32 Knock cylinder 32a Vent hole 32b Engagement part 33 Shaft cylinder 33a Rear end hole 34 Knock cylinder 34a Vent hole 34b Tube part

Claims (3)

[Claims] A ball-point pen having a ball-point pen refill having a tip of a ball-point pen at its tip and an ink storage tube at the rear thereof is mounted in a barrel, and the tip of the tip is positioned so as to project from the tip of the barrel. The tip has a tip ball at the front end, has an idle member that abuts the back surface of the tip ball at the tip bore, and has the idle member directly or via a slidable receiving member on the back surface of the idle member. A spring that presses forward is provided,
The tip ball is in close contact with the inner edge of the ball holding portion at the tip of the tip, and at the rear of the ink storage tube, a knock tube that is at least axially expandable and contractable is provided, and a vent hole is provided at the rear end of the knock tube. Along with the opening, a ventilation path from the ventilation hole to the rear end of the follower is formed, and the rear end of the follower is pressurized by contracting the knock cylinder in a state where the ventilation hole is closed, so that the ink is moved toward the tip of the ink. A ballpoint pen configured to support the fluidity of the ballpoint pen. 2. A ball-point pen having a tip of a ball-point pen at the tip and a ball-point pen refill having an ink storage tube at the rear thereof mounted in the barrel, and positioned so that the tip end protrudes from the tip of the barrel. The tip has a tip ball at the front end, has an idle member that abuts the back surface of the tip ball at the tip bore, a spring that presses the idle member forward is provided, and the tip ball is at the tip end. A valve chamber in which a valve body is loosely fitted is provided at the rear of the chip, and an ink guide hole communicating with the ink storage section is provided at the rear end of the valve chamber, A valve body closes the guide hole upward to prevent the backflow of ink, and a knock cylinder that is at least axially expandable and contractible is provided at the rear of the ink storage pipe, and a rear end of the knock cylinder is provided at the rear end of the knock cylinder. Ventilation A hole is formed, and a ventilation path from the ventilation hole to the rear end of the follower is formed, and the rear end of the follower is pressurized by contracting the knock cylinder in a state where the ventilation hole is closed, thereby causing ink chips to be formed. A ballpoint pen configured to support lateral flow. 3. The ink containing tube contains at least a white pigment such as titanium oxide and polymer hollow fine particles and a gelling agent,
The ballpoint pen according to claim 1 or 2, wherein the ballpoint pen is filled with a white pigment ink formulated so that sedimentation of the pigment is prevented and fluidity is minimized.