JPH1134573A - Refill for ballpoint pen - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a refill for a ballpoint pen requiring for no seal cap by arranging a hard ink guide core in contact with a tip of a tip ball and an elastic element having an ink guide hole to urge the core to its rear end on a back surface of the ball so that a close contact state is released at the time of writing. SOLUTION: An ink guide core 11 is movably mounted without gap in a contact state on a back surface of a tip ball 14, and an open cell porous elastic element 10 is arranged at a rear end of the core 11. Since the end of the core 11 urges the back surface of the ball 14 so that the ball 14 is brought into close contact with an inner edge of a ball embracing part 12a of a tip, forward flow of ink and drying of a writing tip are prevented. And, since the ball 14 is infinitesimally retracted by a writing pressure, a gap is generated so that the ink can flow out. Thus, the ink smoothly flows out by rotation of the ball 14 by writing, and hence writing can be executed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a ballpoint pen refill filled with a low-viscosity ink and capable of being mounted on a writing instrument without requiring a tip at the tip.

[0002]

2. Description of the Related Art A low-viscosity ink such as an aqueous ballpoint pen has a low viscosity of several mPa · S or less, and therefore 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 DC phenomenon in which the ink flows slowly from the pen tip, and a reverse flow phenomenon in which the air flows in from the tip of the ballpoint pen and the ink flows out, are likely to occur. A method of preventing these phenomena by using a fiber convergence body (ink occluding body) called batting has been adopted. Further, there is known an ink storage device provided with an ink storage body for temporarily storing ink. Even with this ink reservoir, if the writing tip is not sealed, there is a problem that, over a long period of time, drying due to evaporation of the ink will result in short writing and short writing life.

In addition, a ballpoint pen refill is mounted,
There are known single and double writing instruments which allow the writing tip to be protruded and retracted from the shaft tip. Knock-type devices, slider-type devices that alternately slide a slider that protrudes from the side of the shaft tube of the writing device, and rotating cam tubes with inclined surfaces are used as the retracting mechanism of the writing tip of the dual-type writing device. Various types such as a cam type are known.

[0004]

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems of the prior art and to provide a ballpoint pen refill that does not require a seal cap. or,
It is possible to provide a convenient single-type and double-type writing implement which is equipped with the ballpoint pen refill so that the writing tip can be protruded and retracted from the shaft tip.

[0005]

The present invention has the following arrangement to achieve the above object. That is, in the refill of a ballpoint pen according to the first aspect of the present invention, in a refill of a ballpoint pen filled with low-viscosity ink which is mounted on a writing instrument without a tip end, a tip end ball is held at the tip end of the ball. Elastic with a hard ink guide core whose tip abuts against the back of the tip ball so that it comes into close contact with the inner edge of the part and is released when writing, and an ink guide hole at the rear end that presses the ink guide core The body is arranged.

A ballpoint pen refill according to a second aspect of the present invention is the ballpoint pen refill according to the first aspect, wherein a joint and an ink reservoir are integrally provided in series behind the chip. The storage tube is a closed-end tubular body, in which the ink storage tube is filled with low-viscosity ink, and an ink reservoir is fitted into an inner hole in the front part of the ink storage tube.

According to a third aspect of the present invention, there is provided a ballpoint pen refill according to the first aspect, wherein the elastic body is prevented from falling off at the rear end of the chip, and has a low viscosity in the ink container tube behind the chip. Is provided with a follower which is moved at the rear end of the ink so as to follow the consumption of the ink accompanying writing.

A ballpoint pen refill according to a fourth aspect of the present invention is the ballpoint pen refill according to the third aspect, wherein the refill of the ballpoint pen is provided at an axial center of a joint portion connecting the tip and the ink storage portion and at a rear end of the tip. A valve chamber is provided at the rear in communication with the valve chamber, and a tapered or spherical ball valve receiving seat is provided at the rear of the valve chamber. The ball valve is loosely fitted into the valve chamber. The guide hole is sealed in close contact with the receiving seat to prevent backflow of the ink, and when the tip side faces downward, the sealed state is released and ink can flow into the tip side through the guide hole.

[0009]

1 and 2 show a first embodiment of a ballpoint pen refill according to the present invention mounted on a knock-type writing instrument or the like.
Is shown. The ink applied to the refill of a ball-point pen is a low-viscosity water-based or oil-based ink such as a ball-point pen, a felt-tip pen, a marker, etc., which is used in a direct liquid type and has an ink occluding body, an ink reservoir, and a valve mechanism.

[0010] As shown in FIG.
The tip 12 is caulked so that the tip ball 13 is rotatably held with the tip ball 14 substantially in contact with the ball receiving seat 15a having the channel portion 15 into which ink can flow. (Ball holding part 12a)

An ink guide core 11 is movably and substantially densely mounted on the back surface of the tip ball 14 in a substantially abutting state, and a continuous porous elastic body 10 is provided at the rear end of the ink guide core 11. At least the forward portion has a gap that allows the ink guide core 11 to be slightly movable, and the rear portion is fixedly fitted in the inner hole of the chip 12. The ink guide core 9 is disposed in contact with the rear end of the elastic body 10. As described above, the tip ball 14 of the ink guide core 11 is brought into water-tight contact with the inner surface of the ball holding portion 12a of the chip by the pressing of the elastic body 10. The ink guide core 11 and the ink guide core 9 are core bodies having fine pores that are continuous in the axial direction, and are obtained by extruding, sintering, or solidifying a fiber bundle with a binder or the like. The configurations of the ink guide core 9 and the ink reservoir 5 are combinations of known facts, and a description thereof will be omitted.

The close contact of the tip ball 14 with the inner surface of the ball holding portion 12a is extremely important for drying the writing tip and preventing direct current of ink. Therefore, grinding of the inner surface to improve the surface roughness of the inner surface of the chip holding the tip ball 14 and close contact accuracy by caulking, and secondary plastic working to increase 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.

The joint 2 has a flange 7 behind the front shaft 3.
And an ink reservoir 5 having a plurality of retaining grooves 6 at the back further formed as an integral resin molded product. Also, the shaft portion 13 of the chip 12 is crimped to the inner hole portion 4 at the tip of the front shaft portion 3,
The ink reservoir 5 is tightly fixed to the front end hole of the ink storage tube 16. (The joint and the ink reservoir can also be connected by a separate member.) In addition, the above-described ink guide core 11 has the tapered tip of the inner hole of the tip 12 substantially on the back surface of the tip ball 14. An elastic body 10 is arranged at the rear end of the ink guide core 11 in a contact state, and further connected to the rear end of the elastic body 10 to connect the ink guide core 9 to the center hole of the ink reservoir 5. And the rear end thereof is provided so as to appropriately protrude behind the rear end of the ink storage body 5.

Further, a ventilation groove 8 is provided at a required portion of the flange portion 7 which is in contact with the front end of the ink storage tube 16 to exchange the outside air with the air in the ink storage body 5 and the ink storage tube 16. The air passage for air replacement has an effect on the loss of volatilization of the ink, and although it is simply shown in the figure, a narrow bypass air passage is desirable.

The ink reservoir 16 is filled with a low-viscosity ink 18 at the rear of the ink reservoir 5. or,
A closed portion 17 is formed at the rear end of the ink storage tube 16. Further, as an example of the ink storage tube 16, a transparent polypropylene resin molded product or the like is used. Also, the ink storage tube 16
Is selected with a material that has excellent clear drain properties. The ink storage tube 16 has a relatively large diameter and is substantially non-deformed.

FIG. 3 shows a ballpoint pen refill according to a second embodiment of the present invention. In the refill 20 of the ballpoint pen, an elastic body 33 is disposed at the rear end of the ink guide core 34, and the rear end of the elastic body 33 is
The rear end of “a” is caulked and prevented from falling off. (The caulking portion 31b) The ink container 36 at the rear of the chip is filled with low-viscosity ink 37, and a follower 38 is provided at the rear end of the ink so as to move following the consumption of ink accompanying writing. . Since the follower 38 is filled with a grease-like translucent non-drying substance, the problem of evaporation and drying of the ink is considered to prevent evaporation from the pen tip, that is, the gap between the tip ball 32 and the inner surface of the ball holding portion of the chip. I just need.

As shown in the figure, the joint 21 has a front shaft 22 at the tip thereof for crimping the shaft 31a of the tip 31 and a rear shaft 23 for crimping at the front end of the ink storage tube 36. The ball valve 3 is provided behind the inner hole 29 of the front shaft portion 22.
There is a valve chamber 26 in which the ball 5 is loosely fitted, and a tapered or spherical ball valve receiving seat 27 and a guide hole 28 provided eccentrically with respect to the axis are provided behind the valve chamber 26, An inner hole of the rear shaft portion 23 communicates with an inner hole of the ink storage tube 36. Further, one side of the inner wall of the valve chamber 26 is provided with ink 3 in the axial direction.
The groove 30 is provided so that 7 flows. This valve chamber 26
When the tip 31 is directed downward, the ball valve 35 that is loosely fitted therein is in contact with the tip of the tip portion 31 a of the tip portion 31 a so as to be biased toward the rear end thereof to form an ink flow path. It flows into the chip inner hole through the groove, the ink flow path and the like through the guide hole 28. Conversely, in the upward state, the ball valve 35 comes into close contact with the ball valve receiving seat 27, and a function of preventing the backflow of ink is obtained.

In order to prevent deformation of the follower due to dropping, knock impact, etc., a resin follower rod 39 having a specific gravity substantially equal to that of the follower is provided in the follower 38 as necessary.
Is immersed. Incidentally, as the ink storage tube 36, for example, a transparent PP resin molded product or the like is used. In addition, the ink container 36 is selected from a material having an excellent clear drain property. Further, the ink storage tube can be formed integrally with the joint 21.

FIGS. 4 to 14 show a knock-type writing instrument on which a ballpoint pen refill of the present invention is mounted. First, the shaft cylinder includes a front shaft 48 and a rear shaft 45. In this knock-type writing instrument, the refill 1 of a ball-point pen is urged rearward by a return spring 51, and this force is transmitted to the rotor 47 and the knock bar 50, and is finally provided in the tube portion 46c of the clip tube 46. Received by the projection 46j. The clip cylinder 46 has a locking projection 46f formed at the rear end of a locking piece 46e provided on the side surface of the cylindrical portion 46c.
Is locked in a locking window 45b provided in the rear shaft 45,
5 fixed.

FIG. 14 is a front view showing a part of an exploded view of the rear shaft 45, the clip cylinder 46, the rotor 47 and the knock bar 50 and the position of the rotor 47 at that time, showing the flow of the rotary cam mechanism. Finally, in the order of A, B, C, and D, the state returns to the state of A again, and during this time, the writing section comes and goes once. The rotary cam mechanism will be described based on this. A rotor 47 is provided between the knock bar 50 and the refill 1 of the ballpoint pen.
When the knock bar 50 is pressed, the force applied in the axial direction by the cam slope 50a of the knock bar 50 and the corresponding cam slope 47c of the rotor 47 is converted into a circumferential rotational force. Is done. At this time, since the knock bar 50 is provided with the rotation stopper 50b and the clip cylinder 46 is provided with the groove 46d corresponding to the rotation stopper 50b, the knock bar 50 does not rotate in the circumferential direction. Only the rotor 47 is configured to rotate a predetermined angle in the circumferential direction.

In the initial stage of the knocking operation, the rotation is controlled by the cam side surface 47e of the rotor 47 and the cam side surface 45c of the rear shaft 45, and the rotor 47 does not rotate. The rotor 47 rotates by a predetermined angle. At this time, the rotor 47 is always urged rearward by the return spring 51 through the refill 1 of the ballpoint pen, and when the pressing on the knock bar 50 is stopped, the cam slope 47a of the rotor 47 and the corresponding rear shaft 45 The rotor 47 further rotates by a predetermined angle by the cam slope 45a, and when the rotor 47 rotates by a certain angle, the protruding locking portion 47b of the rotor 47 is engaged with the locking surface 46b formed on the ball portion of the clip 46a. , The tip of the writing tip is 4
8 protrudes.

The state when the state changes from B to C in FIG. 14 will be described in detail. The cam slope 47a of the rotor 47 moves backward along the cam slope 45a of the rear shaft 45, and at the same time, the engagement of the rotor 47 is changed. The stopping portion 47b also moves while drawing the same locus, but at this time, the locking portion 4 of the rotor 47
In order for 7b to engage with the locking surface 46b of the clip ball portion, it must be able to pass without interfering with the lower end surface of the side wall surface 46g of the clip ball portion. For this purpose, the distance R over which the cam slope 47a of the rotor 47 moves is set to be large,
The inclination angle θ of the cam slope 45a of the rear shaft 45 may be set to an obtuse angle. However, in the former method, the knock stroke is increased, so that the operability is deteriorated. In the latter method, the cam slope 47a of the rotor 47 is shifted to the rear shaft. Since there is a risk of stopping on the cam slope 45a of the cam 45, the operation is not reliable. In order to solve this problem, the height may be set so that the locking portion 47b of the rotor 47 can pass through the lower end surface of the side wall surface 46g of the clip ball portion without interference. However, the other side wall surface 4
If the lower end surface of 6h is made the same height as the lower end surface of the side wall surface 46g, the reliability of the engagement will be lost, so that the lower end surface of the side wall surface 46h is large as long as it does not interfere with the outer diameter of the cylinder of the rotor 47. It is desirable to do. Further, the end surface of the locking surface 46b of the clip ball portion is the lower end surface of the side wall surface 46g and the side wall surface 46h.
By making the lower end surface a slope or a curved surface that connects smoothly, the clip can be smoothly inserted and pulled out of clothes without being caught.

When the writing portion is pressed from the state where the writing portion is protruded from the front shaft 48, the knock bar 50 is pressed, and the cam slope 50a at the front end of the knock bar 50 and the cam slope 47c of the rotor 47 are engaged with each other so that the locking surface 46b of the clip ball portion is engaged. And the locking part 4 of the rotor 47
7b is released. Here, when the pressing of the knock bar 50 is stopped, the cam slope 47a of the rotor 47 is retreated while rotating along the cam slope 45a of the rear shaft 45, and the writing tip is stored in the tip opening of the front shaft 48. At this time, the rotor 47 is set at the same position as the initial state. That is, if the knock bar 50 is pressed again, the projecting operation is possible. Further, the release of the protruding state can be achieved by lifting the ball portion of the clip 46a upward without pressing the knock bar 50 by the locking portion 47 of the rotor 47.
b is disengaged from the engagement surface 46b of the clip ball portion, and the tip of the writing tip is the same as when the knock bar 50 is pressed.
8 is stored in the front end opening. For this reason, if it is attempted to insert the writing tip into the pocket with the writing tip protruding, it is possible to prevent accidents such as the writing tip being automatically stored and soiling the clothes. Knock rods, rotors, and cam slopes formed on the inner surface of the rear shaft required for these operations can be appropriately selected in shape, angle, and number of cams.

[0024]

The refill 1 of the ballpoint pen is the ink guide core 1
Since the tip of the tip 1 presses the back of the tip ball 14 and the tip ball 14 comes into close contact with the inner edge of the ball holding portion 12a of the chip, the direct current of the ink and the drying of the writing tip are prevented.
Further, since the tip ball 14 is slightly retracted by the writing pressure, a gap is generated and ink can flow out. By writing, the ink smoothly flows by the rotation of the tip ball 14 and writing becomes possible. Also, in the event that the tip ball 14 falls off the chip 12 due to dropping, knocking impact or severe writing conditions, ink dripping is held by the capillary of the ink guiding core 11 so that ink is dripped around the periphery. Dangers such as soiling are avoided. The same applies to the refill 20 of the ballpoint pen.

In the case of a ballpoint pen refill 20,
With the tip 31 facing upward, the ball valve 35
Is located at the ball valve receiving seat 27 of the valve chamber 26 and seals the guide hole 28. Therefore, even if the ink is written upward and the ink on the back surface of the tip ball 32 runs out, the ink is caught by the head and does not flow backward. Normally, the tip ball is in close contact with the inner surface of the ball holding portion, so that backflow of ink can be prevented.However, air may be trapped by impact or upward writing, or the tip ball may not be in close contact with the ball holding portion. When complete (due to processing variations, entrapment of dust, etc.), there is a problem that writing scuffing and ink backflow occur. Therefore, the problem can be surely solved by using the ball valve 35 that seals the guide hole 28 together.

The operation of the knock type writing instrument will be described. By pressing the knock bar 50 projecting rearward of the rear shaft, the writing tip of the refill of the ballpoint pen is projected from the tip end of the front shaft, and at this time, it rotates on the engaging surface 46 b of the clip ball provided on the clip cylinder 46. Locking part 47 of child 47
b engages to keep the writing tip protruding,
When the ball portion of the clip 46a is lifted, this engagement is released and the writing tip is stored in the tip end of the front shaft 48. For this reason, even if the writing tip is inserted into the pocket while projecting from the tip of the tip shaft, the accident that the writing tip is automatically stored in the tip of the tip and stains the clothes with ink is prevented. be able to.

[0027]

The configuration and operation of the refill of the ballpoint pen of the present invention are as described above, and it is possible to provide a refill of a ballpoint pen, such as a ballpoint pen, a felt-tip pen and a marker, which does not require a seal cap using a low-viscosity aqueous or oil-based ink. Become. Further, it is possible to provide a convenient single-type and double-type writing implement which is equipped with the ballpoint pen refill so that the writing tip can protrude and retract from the shaft tip.

[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 is an enlarged sectional view of a tip end portion of the tip.

FIG. 3 is a longitudinal sectional view showing an entire refill of a ballpoint pen according to a second embodiment of the present invention.

FIG. 4 is a longitudinal sectional view showing the entire structure of a knock-type writing instrument shown as a usage example of the present invention.

FIG. 5 is a front view of a knock-type writing instrument. (The barrel is transparent and the inside is visible.)

FIG. 6 is an enlarged longitudinal sectional view showing a rear part of the knock-type writing instrument.

FIG. 7 is an enlarged vertical cross-sectional view of a tip portion of the knock-type writing instrument.

FIG. 8 is a front view of a rear shaft. (Transparent)

FIG. 9 is a front view showing the appearance of a knock bar.

FIG. 10 is a side view of FIG. 9;

FIG. 11 is a front view showing the appearance of a rotor.

FIG. 12 is a front view showing the appearance of the clip cylinder.

FIG. 13 is a side view of FIG.

FIG. 14 is a diagram illustrating the operation of the rotary cam mechanism of the knocking writing instrument and the engagement relationship between the locking surface of the clip ball and the locking portion of the rotor.

[Description of Signs] 1 Refill of ballpoint pen 2 Joint 3 Front shaft 4 Inner hole 5 Ink reservoir 6 Retaining groove 7 Flange 8 Vent groove 9 Ink guide core 10 Elastic body 11 Ink guide core 12 Tip 12a Ball holding Part 13 Shaft part 14 Tip ball 15 Channel part 15a Ball receiving seat 15 Channel part 15a Ball receiving seat 16 Ink storage tube 17 Closed part 18 Ink 20 Refill of ballpoint pen 21 Joint 22 Front shaft part 23 Rear shaft part 24 Flange part 25 Vent groove Reference Signs List 26 Valve chamber 27 Ball valve receiving seat 28 Guide hole 29 Inner hole 30 Groove 31 Chip 31a Shaft 31b Caulking portion 32 Tip ball 33 Elastic body 34 Ink guide core 35 Ball valve 36 Ink storage tube 37 Ink 38 Follower 39 Follower rod 45 Rear shaft 45a Cam slope 45b Lock window 45c Cam side 45d window portion 46 clip cylinder 46a clip 46b locking surface 46c cylindrical portion 46d groove 46e locking piece 46f locking protrusion 46g side wall surface 46h side wall surface 46i rib 46j protrusion 47 rotor 47a cam slope 47b locking portion 47c cam slope 47d protrusion 47e Cam side surface 48 Tip shaft 49 Rubber grip 50 Knock rod 50a Cam slope 50b Rotation stop 50c Projection 51 Return spring 52 Tip seal material

Claims (4)

[Claims] In a refill of a ball-point pen filled with a low-viscosity ink which is mounted on a writing instrument without requiring a tip at a tip, a tip ball comes into close contact with an inner edge of a ball holding portion at a tip tip and is in a close contact state during writing. A ballpoint pen refill having a hard ink guide wick whose tip abuts against the back surface of the tip ball so as to release the ink, and an elastic body having an ink guide hole at its rear end for pressing the ink guide wick. 2. A joint and an ink reservoir are integrally provided in series behind the chip, and the ink storage tube is a tubular body having a closed rear end. 2. The ballpoint pen refill according to claim 1, wherein an ink reservoir is fitted into an inner hole of a front portion of the housing tube. 3. A follower in which an elastic body is prevented from falling off at the rear end of the chip, low-viscosity ink is filled in an ink storage tube behind the chip, and the rear end of the ink moves following the consumption of ink accompanying writing. The ball-point pen refill according to claim 1, further comprising: 4. A valve chamber is provided at the rear of the shaft center of a joint portion connecting the chip and the ink storage section, the valve chamber being provided in communication with the rear end of the chip, and a tapered or spherical ball valve receiver is provided at the rear of the valve chamber. A seat is provided, and the ball valve is loosely fitted in the valve chamber. When the tip side is upward, the ball valve is in close contact with the ball valve receiving seat, the guide hole is sealed, and backflow of ink is prevented,
4. The ballpoint pen refill according to claim 3, wherein the closed state is released when the tip side is downward, and ink can flow into the tip side through the conductive hole.