JPH10264577A - Refill for ballpoint pen - Google Patents

Abstract

PROBLEM TO BE SOLVED: To eliminate backflow, direct flow of ink by providing a tip so that a tip ball is pressed in close contact with an inner edge of a ball embracing part of a tip end at the normal time and released from the close contact state at the time of writing. SOLUTION: Spring seats 17b for pressing a back surface of a tip ball 13 so that a ball seat 17a in contact at the time of applying a writing pressure is brought into close contact with an inner edge of a ball embracing part 11a are radially alternately disposed on the back surface of the ball 13 at a tip 12. An ink introducing groove 17c for supplying ink is formed between the arranged seat 17a and the seats 17b. A joint is formed integrally with an ink storage unit at the rear of a front barrel. And, a barrel of the tip 11 is press- bonded to an inner hole of the end of the front barrel, and the storage unit is fixed snugly to a front end hole of an ink-containing tube.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention has an ink storage section for directly storing ink without absorbing it into an ink storage body or the like.
In addition, when the air in the ink container expands due to a rise in temperature, etc., the tip of the tip with an ink reservoir that temporarily retains the ink pushed out from the ink container to prevent it from dripping from the ball or vent groove. The present invention relates to a ballpoint pen refill that can be mounted on a writing instrument without requiring a seal.

[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 those provided with the ink reservoir, there is a problem that unless the tip of the writing is sealed, the writing due to the evaporation of the ink and the writing life are shortened and the writing life is shortened.

[0003] Also, there is known a double-type writing instrument having a plurality of writing objects such as a ball-point pen mounted thereon so that a writing tip can be selectively protruded and retracted from an axis. In addition, as a retracting mechanism of the writing tip portion of the double-type writing instrument, a knocking type, a slider type that alternately slides a slider protruding from the side of the shaft cylinder of the writing instrument, and a cam cylinder having an inclined surface are rotated. Various types such as a cam type are known. The conventional hammering mechanism is
Since the return spring for returning the cursive body to the inside of the barrel is built in, there is a problem that the structure is complicated, the number of parts is large, and the cost is high. Also, if the tip of the cursive writing is inserted into a pocket or the like while protruding, there is a risk that ink will be sucked out and the clothes will be stained.

[0004]

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems of the prior art, that is, to provide a simple or double writing implement which does not require a seal cap and which is provided with an ink reservoir for temporarily storing ink. A ballpoint pen refill that can be mounted can be provided.

[0005]

The present invention has the following arrangement to achieve the above object. The refill of a ballpoint pen according to the first aspect of the present invention is a refill of a ballpoint pen filled with low-viscosity ink which is mounted on a writing implement without a tip at the tip, and the tip ball is a ball holding portion at the tip tip. A tip provided so that it is always pressed against and close to the inner edge to release the close contact when writing, and an ink guide core is closely mounted in the tip bore, and a series of joints and ink storage are provided behind the tip in series. The ink receiving tube is a non-deformed, closed-end rear end having a relatively large cross-sectional area. The ink receiving tube is filled with low-viscosity ink, and the inner hole in the front portion of the ink receiving tube is provided. And an ink reservoir is fitted to the substrate.

According to a second aspect of the present invention, there is provided a ball-point pen refill according to the first aspect, wherein the ball receiving seat abuts against the back surface of the tip ball with a tip when writing pressure is applied. A spring seat for pressing the back surface of the tip ball so that the tip ball and the inner edge of the ball holding portion are in close contact with each other is provided at a required position, and the tip ball is disposed between the provided ball receiving seat and the spring seat. An ink inflow groove capable of supplying ink is formed.

A ballpoint pen refill according to a third aspect of the present invention is the ballpoint pen refill according to the first and second aspects, wherein the shaft cylinder formed by the front shaft and the center shaft has an elongated cylindrical shape. A double writing implement comprising a pair of sliding members disposed in a substantially inscribed state on the inner periphery of the shaft cylinder facing each other in the longitudinal direction of the long cylindrical shape, and a cam mechanism for alternately moving the sliding members back and forth; The writing tip is mounted on the double-type writing instrument and connected to the front of each sliding body, so that each writing tip can protrude and retract from the tip end of the barrel in conjunction with the sliding body.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS First, a refill of a ballpoint pen according to a first embodiment of the present invention will be described. The ink applied to the refill of a ballpoint pen is an aqueous or oily low-viscosity ink.

As shown in FIG. 1, the tip 11 of the refill 1 of a ball-point pen is provided with a channel portion 17 through which ink can flow.
The tip ball 13 is caulked so as to be rotatably held in a state where the tip ball 13 is substantially in contact with the seat having the shape. (Ball holding part 11a)

The details of the channel portion 17 will be described with reference to FIGS. 2 and 3. More specifically, the ball receiving seat 17a and the tip ball 13 which come into contact with the tip 11 on the back surface of the tip ball 13 when pen pressure is applied, hold the ball. The spring seats 17b for pressing the back surface of the tip ball 13 so as to be in close contact with the inner edge of the portion 11a are alternately arranged in a radial pattern, and the arranged ball receiving seats 1 are provided.
An ink inflow groove 17c that can supply ink is formed between the spring seat 7a and the spring seat 17b.

The tip ball 13 is a ball holding portion 11a.
Close contact with the inner surface is extremely important for drying the writing tip and preventing direct current of ink. In this embodiment, the tip 11 is assumed to be a resin molded product having excellent spring properties, abrasion resistance and ink sealing performance. In order to improve the surface roughness of the inner surface of the chip holding the 13 and the closeness accuracy by caulking, grinding of the inner surface and secondary plastic working for increasing 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 12 of the chip 11 is press-bonded to the inner hole portion 4 at the tip of the front shaft portion 3,
The ink reservoir 5 is firmly fixed to the front end hole of the ink storage tube 14. (The joint and the ink reservoir can also be provided by being connected by separate members.) Further, the first ink guide core 10 has a tapered tip in the inner hole of the tip 11 substantially on the back surface of the tip ball 13. A second ink guide core 9 is tightly packed in a contact state, connected to the rear end of the ink guide core 10, and is closely mounted in the center hole of the ink storage body 5, and the rear end is connected to the ink storage body 5. 5 is provided so as to protrude rearward of the rear end as appropriate.

Further, a ventilation groove 8 is provided at a required portion of the flange portion 7 which abuts on the front end of the ink storage tube 14 to exchange air with the outside air and the ink reservoir 5 and the ink storage tube 14. 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 14 is filled with a low-viscosity ink 16 at the rear of the ink reservoir 5.
A closing portion 15 is formed at a substantially rear end of the ink storage tube 14. In addition, a transparent polypropylene resin molded product or the like is used for the ink storage tube 14 as an example. Also, the ink storage tube 14 is selected from a material having excellent clear drain properties. or,
The ink storage tube 14 has a relatively large diameter and is substantially non-deformed.

On the other hand, FIGS. 4 to 9 show an embodiment of a double-type writing instrument equipped with a ballpoint pen refill according to the present invention. The refills 1a and 1b of the ball-point pens have different ink colors filled with the low-viscosity ink and different writing line widths, and the structure is shown by the refill 1 of the ball-point pen described above.

The double-type writing instrument shown in FIG. 4 comprises a front shaft 58 and a center shaft 30 for accommodating the writing tool mechanism, and a rear shaft 39 disposed at the rear end of the center shaft. Engaging portions 32 and 59 are provided at the front end of the center shaft 30 and the rear end of the front shaft 58, respectively. The engagement portions 32 and 59 are engaged with each other, and the center shaft and the front shaft are integrated. Exchange and so on. Note that the shaft cylinder is composed of a front shaft and a rear shaft, and in a case where it is not necessary to replace the cursive writing, the front shaft and the rear shaft are an integral shaft cylinder.

The rear portion of the front shaft 58 and most of the center shaft 30 are formed in an elongated cylindrical shape. Further, both side surfaces in the short diameter direction of the long cylindrical portion 30d of the central shaft are formed as substantially flat flat portions 30f. Further, a cylindrical portion 30c is provided behind the long cylindrical portion 30d, and an edge portion 30e is formed on the side edge of the long diameter portion at the rear end of the long cylindrical portion 30d. Further, a rib 30a for preventing rotation is formed on the inner periphery of the rear end of the inner hole of the cylindrical portion 30c, which regulates a rotation range of the rotating shaft 33, which will be described later. The rib 30a has a stepped portion 30b. Four guide grooves 57 are formed in the inner peripheral portion at an interval of 90 degrees and formed in the axial direction.
Also, four guide grooves 56 formed in the axial direction at 90 ° intervals from the rear end to the front end are formed in the inner peripheral portion of the long cylindrical portion 30d.

The rotating shaft 33 has a small-diameter portion 3 in front of the large-diameter portion 36.
The spiral cam groove 35 is formed on the peripheral surface of the small diameter portion 34. In addition, a shaft portion having a reduced diameter is provided behind the large-diameter portion 36, and a protruding locking portion 37 is provided on an outer periphery in front of the shaft portion.
A detent groove 38 is provided at a required position at the rear end.
A groove 36a is provided on the peripheral surface of the large-diameter portion 36 to regulate the rotation of the rotating shaft 33 between the central shaft 30 and the normal shaft 30 by engaging the rib 30a. (See FIG. 6) It should be noted that increasing the rotation angle of the rotation shaft 33 has the advantage of reducing the rotation resistance and facilitating operation, but the fact that the action is increased by increasing the rotation angle is a disadvantage in operation. Become. Therefore, when the diameter of the barrel is small, the rotation angle is selected closer to 180 degrees, and when the diameter is larger, the rotation angle is selected closer to 120 degrees for design convenience.

The sliding members 48a and 48b are provided with tip portions 49a and
49b and the rear portions 50a, 50b, and the front portions 49a,
An insertion hole is provided in the shaft center of the front end of 49b, and bosses 54a and 54b are formed in the respective insertion holes, and the rear end inner hole portions of the ballpoint pen refills 1a and 1b are fixed to the outer periphery of the boss. I have. Vent grooves 55a, 55b are formed on the outer periphery of the bosses 54a, 54b. This is provided so that ventilation can be made to the inner hole of the ink storage tube when the refill of a ball-point pen having a rear end opening other than the embodiment is fixed. Also, the rear portions 50a, 50b
The cam groove 35 accompanying the rotation of the rotating shaft 33
Projection 51 for each sliding body to move back and forth by pressing
a, 51b are formed.

Further, ribs 53a and 53b are provided on the outer periphery of the leading end portions 49a and 49b of the sliding member so as to stop and engage with the guide grooves 56 formed on the inner periphery of the long cylindrical portion 30d. ing. (It is also possible to replace the groove and the rib between each other.) Also, on the outer periphery of the rear portion 50a, 50b of the sliding body, there is provided a guide for the guide formed on the inner periphery of the cylindrical portion 30c of the center shaft. The grooves 57 are provided with ribs 52a and 52b which are engaged with the rotation stop. (The groove and the rib between each other can be replaced with each other.) Therefore, the rib provided on the outer periphery of the sliding bodies 48a and 48b meshes with the guide groove provided on the inner periphery of the center shaft 30, respectively. Thereby, the sliding bodies 48a and 48b are smoothly moved back and forth.
Further, there is an advantage that a complicated structure for mounting a guide cylinder having two opposed guide grooves, which is often shown in the conventional example, is not required.

The rotating shaft 33 is provided with the sliding members 48a,
The projections 51a and 51b of the 48b are inserted into the inner hole of the center shaft 30 in a state of being engaged with the cam grooves 35, and the rear end of the large diameter portion 36 abuts on the step 30b of the center shaft, and The rear shaft 39 is fixed to the rear end shaft portion so as to be integrated therewith. That is, the locking portion 37 of the rotation shaft is provided with the locking groove 4 of the inner hole of the rear shaft 39.
4, the detent groove 38 is engaged with the detent rib 40 at the rear end of the rear shaft inner hole, and the rotary shaft 33 and the rear shaft 39 are integrally fixed. As a result, the rotating shaft 33 rotates, with which one of the sliding bodies moves forward, and the other sliding body moves backward. The rear ends of the ballpoint pen writing bodies 1a, 1b are fixed to bosses 54a, 54b formed in the insertion holes of the sliding bodies 48a, 48b, and the front shaft 58 is fixed in front of the center shaft 30. In addition, if necessary, by setting the dimensions so that the writing body swings appropriately in the fixed state of the boss of the sliding body and the rear end of the writing body, even in the non-deformed writing body, it is easy to move in the centripetal direction. It can be displaced.

The front of the long shaft portion 30d of the middle shaft and the rear shaft 39 is formed in a substantially cylindrical shape having substantially the same shape, and the edge portion 30e is provided on the side of the long diameter portion at the rear end of the long cylinder portion 30d as described above. And a clip 4 on one side surface of the flat portion 47 which is a short diameter portion of the rear shaft 39.
In the state where the tip of the cursive body protrudes from the tip end of the barrel, the tip 46 provided at the front end in the longitudinal direction of the clip engages with the edge 30e at the rear end of the center shaft, and The clip 45 cannot be attached to the pocket or the like, and the tip of the clip 45 is located on the flat portion 30f, which is the short diameter portion at the rear end of the center shaft, with the tip of the cursive body stored in the barrel. It is configured so that it can be attached to the camera. In addition, since the flat portion is gripped and written with a finger, the usability is not large.

The ballpoint pen refill 60 shown in FIG.
Shows a second embodiment of the refill of the ballpoint pen of the present invention. The difference from the first embodiment is that the tip portion 62 is formed as an integral resin molded product in front of the joint 61 in order to make the cost lower.

FIGS. 11 and 12 show another embodiment of the chip. As shown in the figure, the tip 70 is caulked so that the channel member 72 into which ink can flow can be fixed and the tip ball 71 is rotatably held with the tip ball 71 substantially abutting on its seat. . (Ball Holder 70a) The channel member 72 will be described in detail. The ball member 72a, which is fixed by the tip 70 on the back surface of the tip ball 71 when the pen pressure is applied, contacts the ball member 72a. And spring seats 72b for pressing the back surface of the tip ball 71 such that the tip ball 71 and the inner edge of the ball holding portion 70a are in close contact with each other, are arranged alternately in a radial pattern, and the ball receiving seat 72a and the spring seat 72b are provided. And an ink inflow groove 72c that allows ink to be supplied. The tip 70 used for refilling the ballpoint pen is
The channel member 72 is assumed to be made of resin or metal. The first ink guide core is tightly packed in the inner hole of the tip 70 with its tapered tip substantially in contact with the back surface of the tip ball 71. (Not shown)

[0025]

First, the refill of the ballpoint pen according to the first embodiment will be described. (The description is omitted because Embodiment 2 is basically the same.) The refill 1 of the ball-point pen is written with the direct current of the ink because the tip ball 13 is brought into close contact with the inner edge of the ball holding portion 11a of the chip by pressing the spring seat 17b. Drying of the tip is prevented. In addition, the tip ball 13 is slightly retracted by the writing pressure, so that a gap is generated and the ink can flow out, and the ink smoothly flows by the rotation of the tip ball 13 by writing,
Writing with high handwriting density becomes possible.

Next, the operation of the double-type writing implement equipped with the ballpoint pen refill 1 will be described. When the rear shaft 39 rotates in one direction with respect to the center shaft 30, the sliding members 48a, 48b
The projections 51a and 51b slide along the cam groove 35 with the rotation of the rotating shaft 33, and one of the sliding pieces moves forward and the other retreats, and the writing tip of the refill of the ballpoint pen on the forward side. The part can be made to protrude from the front end port of the front shaft 58. In addition, even if the ink storage portion of the refill of the ballpoint pen is not deformed, the writing tip portion can be shifted in the centripetal direction with respect to the tip opening, and the tip shaft changes to a long cylindrical shape until reaching the tip opening. Operation is not impeded,
The writing tip smoothly emerges from the tip opening of No. 8.

In a state where the refill 1a of one of the ballpoint pens protrudes, as shown in FIG.
4 is engaged with the edge 30e of the center shaft to create a state where the clip cannot be inserted into a pocket or the like. Next, the rotating shaft 33
When the is rotated, the sliding body 48a retreats, the writing tip of the refill 1a of the ballpoint pen enters the front shaft 58, and the sliding body 48b moves forward. At this time, the writing tip is in a portable state accommodated in the front shaft 58, and the clip for that state is at the position shown in FIGS. 8 and 9 and can be easily inserted into a pocket or the like. When the rotating shaft 33 is further rotated, the sliding body 48a is further retracted, and the sliding body 48b is further advanced, so that the writing tip of the refill 1b of the ballpoint pen projects from the tip opening of the front shaft 58. At that time, clip 44
Is reengaged with the center shaft edge 30e to create a state where the clip cannot be inserted into a pocket or the like. Further, the contact portion 36c of the groove 36a of the large-diameter portion 36 of the rotating shaft shown in FIG. 6 abuts on the rib 30a of the rear shaft to regulate the other rotation.

[0028]

The construction and operation of the dual writing instrument of the present invention are as described above. The ink is filled with low-viscosity ink so that the ink does not flow backward and does not have a direct current phenomenon. Can be left as it is, and a refill of a ball-point pen can be provided which can be mounted on a single or multiple writing instrument which does not require a seal cap. In addition, two types of ballpoint pen writing materials using low-viscosity ink are mounted in the barrel, and the writing tip of each writing body can selectively emerge from the tip of the barrel. Can be provided with the thickness of the shaft body satisfying (since the flat part is grasped by the finger). In addition, such a refill of a ballpoint pen for a desk of this type has an effect that compatibility can be provided as a writing body of a double-type writing instrument.

[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 main part of a tip end of the tip.

FIG. 3 is a cross-sectional view at a slightly upper position of a channel portion of a chip.

FIG. 4 is a longitudinal cross-sectional view showing the entirety of the double-type writing instrument according to one embodiment, and is partially not shown in section. Also, two types of ballpoint pen refills are mounted.

FIG. 5 is a sectional view taken along the line AA in FIG. 4;

FIG. 6 is a sectional view taken along the line BB in FIG. 4;

FIG. 7 is a sectional view taken along the line CC in FIG. 4;

FIG. 8 is a front view showing an appearance of a main part in a state in which a writing tip portion of the compound writing instrument according to the embodiment is housed in a shaft cylinder.

FIG. 9 is a top view corresponding to FIG.

FIG. 10 is a longitudinal sectional view showing the entire refill of the ballpoint pen according to the second embodiment of the present invention.

FIG. 11 is an enlarged sectional view of a main part of a tip end of a chip according to another embodiment.

FIG. 12 is a cross-sectional view at a slightly higher position of a channel portion of a chip according to another embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Refill of ball-point pen 1a Refill of ball-point pen 1b Refill of ball-point pen 2 Joint 3 Front shaft 4 Inner hole 5 Ink reservoir 6 Reservation groove 7 Flange 8 Vent groove 9 Ink guide core 10 Ink guide core 11 Chip 11a Ball holding Part 12 Shaft part 13 Tip ball 14 Ink storage tube 15 Closure part 16 Ink 17 Channel part 17a Ball receiving seat 17b Spring seat 17c Inflow groove 30 Center shaft 30a Rib 30b Step 30c Cylindrical part 30d Long cylindrical part 30e Edge 30f Flat part 32 Engaging part 33 Rotating shaft 34 Small diameter part 35 Cam groove 36 Large diameter part 36a Groove 36b Contact part 36c Contact part 37 Lock part 38 Detent groove 39 Rear shaft 40 Rotation stop rib 41 Hole part 42 Lock groove 43 Base part 44 Clip 45 Ball part 46 Tip part 47 Flat part 48a Sliding body 48b Sliding body 49a Tip 49b Tip 50a Rear 50b Rear 51a Projection 51b Projection 52a Rib 52b Rib 53a Rib 53b Rib 54a Boss 54b Boss 55a Vent groove 55b Vent groove 56 Guide groove 57 Point guide groove 59 Retaining portion 60 Refill of ballpoint pen 61 Joint 62 Tip portion 63 Ink reservoir 70 Tip 70a Ball holding portion 71 Tip ball 72 Channel member 72a Ball receiving seat 72b Spring seat 72c Inflow groove for ink

Claims (3)

[Claims] In a refill of a ball-point pen filled with low-viscosity ink which is mounted on a writing instrument without needing a seal at the tip of the tip, the tip ball is always pressed against the inner edge of the ball holding portion at the tip of the tip to be in close contact therewith. , A chip provided so that the close contact state is released at the time of writing, an ink guide core is closely mounted in the inner hole of the chip, and a joint and an ink reservoir are integrally provided in series behind the chip, and ink is provided. The storage tube is a non-deformed one having a relatively large cross-sectional area and closed at the rear end. The ink storage tube is filled with low-viscosity ink, and an ink reservoir is fitted into a front inner hole of the ink storage tube. Refill of ballpoint pen. 2. A ball receiving seat abutting when writing pressure is applied to the back surface of the tip ball with a tip, and a spring seat pressing the back surface of the tip ball so that the tip ball comes into close contact with the inner edge of the ball holding portion. 2. The refill of a ballpoint pen according to claim 1, wherein an ink inflow groove is provided at a required location, and an ink inflow groove capable of supplying ink to the tip ball is formed between the provided ball receiving seat and the spring seat. 3. A shaft cylinder formed by a front shaft and a center shaft is formed in a long cylindrical shape, and a pair of slides are disposed in a substantially inscribed state on the inner periphery of the shaft cylinder so as to face each other in the longitudinal direction of the long cylinder. A multiple writing instrument comprising a moving body and a cam mechanism for alternately moving the sliding body back and forth, and each of the writing elements mounted on the dual writing instrument and connected to the front of each sliding body, and interlocking with the sliding body to perform each writing operation 3. The ballpoint pen refill according to claim 1, wherein the distal end portion can be protruded and retracted from the distal end opening of the barrel.