JPH1016482A - Double pen type writing implement - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable smooth projection and withdrawal of writing end parts and to prevent clothes or the like from being stained by a method wherein writing bodies are moved forward and backward along helical grooves provided in a cap and are projected selectively by rotating the cap and portions connecting ink storing parts and the wiring end parts are formed of bendable parts. SOLUTION: When a cap 34 is rotated in one direction, slidable projecting parts 26 of sliders 21a and 21b slide along helical grooves provided in the inner peripheral surface of the cap 34, one of the sliders moves forward, while the other moves backward, and the writing end part of a writing body 1a or 1b on the forward moving side is projected from the fore end opening of a holder tube 30. On the occasion, the writing end part is projected and withdrawn smoothly from the fore end opening, since a flexible bendable part 4 is provided in a writing front portion, although the shape of ink storing parts of the writing bodies 1a and 1b is unvaried. In a state wherein one writing body 1a is projected, besides, a ball part 39 of a clip 38 and a bulge part 33 of the peripheral surface of the holder tube 30 engage with each other and bring about a state wherein the clip 38 can not be put on a breast pocket or the like, and thus clothes or the like can be prevented from being stained.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improved writing instrument having a plurality of ballpoint pen writing bodies.

[0002]

2. Description of the Related Art In general, there is known a double-type writing instrument equipped with a plurality of writing objects such as a mechanical pencil and a ball-point pen so that the writing tip can be selectively protruded and retracted from an axis.

A water-based ballpoint pen has a viscosity of several mPa ·
Since it has a low viscosity of S or less, it is advantageous to be able to write with a light writing pressure, and has a characteristic that writing quality is good. 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 material called batting is used.

On the other hand, conventionally known oil-based ball-point pens have a high viscosity of several thousands mPa · S or more of the ink used for the ball-point pens, so that the resistance to the rotation of the ball when the ink flows out of the pen tip is high. There is a drawback that writing is bad because of large size. In addition, there is a problem in that the amount of ink flowing out from the tip during writing is small, there is a dent phenomenon, the writing line is uneven, the writing density is low, and a high writing pressure is required.

As an improvement of the oil-based ballpoint pen, recently,
A ballpoint pen for water-based ink called a 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. Further, as an improvement of the oil-based ball-point pen, a ball-point pen using a low-viscosity oil-based ink having excellent drying resistance can be considered.

The ballpoint pens using the medium-viscosity water-based ink and the low-viscosity oil-based ink are all low-viscosity, so that when the tip side is turned downward, a gap between the tip ball and the chip holding portion is generated. There is a phenomenon in which the ink tends to flow backward due to a direct current problem in which ink bleeds, upward writing, impact, or the like. If the ink causes backflow or direct current, there is a risk of soiling clothes and the like. In addition, when mounted on a writing instrument and inserted into a breast pocket or the like with the writing tip protruding, there is a problem in that clothes are soiled.

[0007]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a writing tip having a mechanism capable of maintaining the drying resistance, allowing the seal cap to be left unattended, and preventing direct current or backflow of ink. Constitutes a medium-viscosity water-based, low-viscosity oil-based ballpoint pen, and is equipped with a plurality of large, non-deformable ballpoint pens, allowing the writing tip to appear and disappear smoothly. The protruding state of the writing tip can be easily recognized by making it impossible to insert it into the breast pocket etc. with the protruding part, so it is possible to provide a simple writing instrument with a simple structure that does not have to worry about soiling clothes etc. And

[0008]

SUMMARY OF THE INVENTION According to the present invention, there is provided a double-type writing instrument in which a plurality of ballpoint pen writing bodies are mounted in a barrel, and each of the writing tips can be selectively protruded and retracted from the tip end of the barrel. , A ball-point pen writing body disposed only on the shaft cylinder so as to be able to change the axis, a cap fixed to the shaft cylinder only rotatable, and a ball-point pen writing body on a spiral groove provided on the inner periphery of the cap By engaging a sliding projection provided so as to be interlocked with, and rotating the cap, the ballpoint pen writing body can be moved back and forth, and the ink storage portion of the ballpoint pen writing body is substantially non-deformable and has a shaft. It is inserted into the space in the cylinder without swinging, and a portion connecting the ink storage portion and the writing tip portion is formed of a flexible displaceable bendable portion. Further, a rib extending forward is provided in the inner hole of the cap, and the rear end of the sliding piece abuts on the front end thereof and is locked in a state where the writing tip of one ballpoint pen writing body protrudes. It is constituted as follows.

A clip having a base fixed to one side surface of the cap and disposed toward the front of the barrel, and a ball provided with a locking portion at the forward end of the clip are provided. A bulging portion provided with a locking portion is provided at a predetermined position on the peripheral surface of the barrel to be in contact with, and only when the cap is rotated so that the writing tip protrudes from the tip end of the barrel, the ball portion of the clip. And the engaging portion of the bulging portion is engaged with each other so that the ball portion of the clip does not separate from the shaft cylinder surface.

The ballpoint pen writing body has a tip for holding the tip ball and an ink storage tube at the rear, and the viscosity of the tip ball is reduced by the rotation of the tip ball accompanying the writing and flows out into the ink storage tube. A water-based ballpoint pen ink or a low-viscosity oil-based ink having a shear-thinning property is filled, and the rear end of the ink is filled with a follower made of a grease-like translucent non-drying substance that moves following the consumption of the ink accompanying writing. Consisting of The ballpoint pen writing body includes a spring provided so that the tip ball always presses and contacts the inner edge of the ball holding portion at the tip of the tip, and the contact state is released during writing. Further, the ballpoint pen writing body is provided with a valve chamber in which a ball valve is loosely fitted in contact with a rear end of the chip, and a ball receiving seat for preventing backflow of ink due to a close contact of the ball valve with the rear of the valve chamber. A guide hole is provided from the receiving seat to the ink storage tube.

[0011]

1 to 4 show an embodiment of the present invention. In FIG. 1, two ballpoint pen cursives 1a,
1b is provided. The dual writing implement intended by the present invention is a ballpoint pen writing medium filled with a so-called middle viscosity aqueous or low viscosity oily ballpoint pen ink having a shear thinning property, or a normal oily ballpoint pen writing body equipped with a large volume of ink. Are used in combination as needed.

First, a ballpoint pen writing body mounted on the double-type writing instrument of the present invention will be described. Note that the ballpoint pen writing bodies 1a and 1b have the same configuration, and have different ink colors, for example. Further, the ink applied to the ballpoint pen writing material is mainly a medium-viscosity aqueous and low-viscosity oil-based ink having a so-called shear thinning property.

The tip 11 is caulked so that the tip ball 12 is rotatably held with the tip ball 12 substantially in contact with a seat having a channel into which ink can flow. Further, the spring 14 is inserted into the inner hole of the chip 11, and the rear end of the chip is appropriately caulked so that the rear end of the spring 14 cannot be pulled out. In addition, it is extremely important that the tip ball 12 is in close contact with the inner surface of the tip holding portion in order to dry the writing tip and to prevent direct current of ink. Therefore, the surface roughness of the tip holding the tip ball and the caulking In order to improve the close contact accuracy, grinding of the inner surface and secondary plastic working to increase the crimping accuracy are considered. or,
The surface treatment etc. are considered in the close contact surface with the tip ball.
Further, the tip of the spring 14 becomes a straight rod shaft portion 15, and the tip of the rod portion 15 comes into contact with the back surface of the tip ball 12 in a pressed state. In addition, the tip ball 12 is pressed by the pressing to
The first ball holding portion (formed by caulking or the like) is in close contact with the inner edge.

The joint 2 has a front shaft 3 for pressing the tip 11 at the tip and a rear shaft 5 for pressing the front end of the ink storage tube 17 at the front end, between the front shaft 3 and the rear shaft 5. Are formed of a resin molded product integrally connected by a flexible displaceable bendable portion 4. A valve chamber 7 in which a ball valve 16 is loosely fitted is provided in the joint 2 so as to face the rear end of the chip 11. When the chip 11 is downward, the guide hole 9 is opened and the ink 18 is filled with the chip 18. The ball valve 16 is configured to seal the guide hole 9 to prevent the ink from flowing backward when the ball valve 16 is in the upward direction.

The cross section of the ink storage tube 17 is substantially D-shaped (not shown), and has a substantially circular shape with two flat portions in contact with each other. Decorate the hole space without waste. In the case of three ink containers, the cross section of the ink storage tube is formed in a substantially fan shape obtained by dividing a circle into 120 degrees.
The ink storage tube 17 is filled with the above-mentioned medium-viscosity water-based or low-viscosity oil-based ink. Follower 19 consisting of translucent non-drying material
Is filled. In the follower 19, a resin-made follower rod 20 having substantially the same specific gravity as the follower is immersed.

A shaft portion 22 in front of the sliding piece 21a is press-fitted and fixed to the rear end hole of the ink storage tube 17. Further, a ventilation groove for communicating the inside of the ink storage tube 17 with the outside air is provided on the peripheral surface of the shaft portion 22. A guide rib 25 and its guide rib 2 are provided on one side of the rear shaft portion 24 of the sliding piece 21a.
5 is formed with an appropriately bulging sliding projection 26 on the outer surface. Thus, the ballpoint pen writing body 1a is configured. or,
The ballpoint pen writing body 1b is similarly configured.

The double-type writing instrument shown in FIG. 1 comprises two kinds of ballpoint pen writing bodies, a barrel 30 for accommodating the ballpoint pen writing body, and a cap 34 fixed to the rear of the barrel 30 so as to be rotatable only. In addition, the cap 34 is removed from the shaft cylinder 30 as needed, and the writing body is replaced.

By the way, a bulging portion 33 is formed at two places on the outer periphery of the shaft cylinder 30 slightly rearward, and a locking portion composed of a convex portion 33b and a concave portion 33a is formed on the front surface of the bulging portion 33. I have. As shown in FIGS. 1 and 2, a cylindrical portion 31 is extended behind the bulging portion 33, and a circumferential projection 32 b is provided on the peripheral surface of the cylindrical portion 31, further rearward, and at a rear end. Two opening slit portions 32b are formed, and the ballpoint pen writing bodies 1a, 1b are inserted into the shaft cylinder 30, and sliding holes provided at the rear ends of the ballpoint pen writing bodies 1a, 1b in the respective slit sections 32b. Guide ribs 25 of tops 21a and 21b,
The sliding protrusion 26 is inserted.

As shown in FIG. 3, the cap 34 is a tubular body having a crown 36 closed at the rear end, and a clip 38 connected to one side of a rear outer peripheral portion of the tubular body by a base 38a extends forward. Has been established. A locking portion composed of a convex portion 40 and a concave portion 41 is formed on the rear surface of the ball portion 39 of the clip 38, and the convex portion 40 of the ball portion 39 is moved by the circumferential movement of the clip accompanying rotation of the cap 34 described later. The concave portion 33a of the bulging portion 33
Disengage from A circumferential concave groove 35 is formed on the inner periphery of the front end of the cap 34, and a spiral groove 42 is formed on the inner periphery of the rear end. Also, a wide portion 42 is appropriately provided at the front and rear ends of the spiral groove 42.
a and 42b are formed. An annular rib 37 extending from the crown 36 is formed behind the spiral groove 42, and a rib 37 a extends forward from one end of the annular rib 37.

As described above, the cap 34 is connected to the cylindrical portion 31 of the shaft cylinder.
The projection 32a engages with the concave groove 35 by elastic deformation, so that the projection 32a is rotatable with respect to the shaft cylinder 30 and is prevented from coming off.
At this time, the sliding projections 26 of the sliding pieces 21a and 21b are respectively engaged with the spiral grooves 42 by elastic deformation, and the rotation of the cap 34 with respect to the barrel 30 causes the ballpoint pen writing bodies 1a and 1b to alternately move back and forth. Thus, each writing tip can be protruded and retracted from the tip opening of the barrel. Further, the front end of the rib 37a abuts and locks on the rear end of the sliding piece in a state where one of the ballpoint pen writing bodies protrudes. At this time, the ink storage tube 17 is not deformed as described above,
With this, the writing tip smoothly appears and disappears.

In addition to the above-mentioned embodiments, the ballpoint pen writing body is constituted by having an ink guiding core and an ink absorbing body, and has an ink storage mechanism called a collector between the tip and the liquid ink. And the like. In addition, problems such as evaporation of the ink and drying of the writing tip can be realized by devising the ink composition, the tip structure, and the air replacement structure. By the way, the ballpoint pen cursive referred to in claim 1 includes the pen. In addition, the sliding piece at the rear end of the ballpoint pen writing body is made detachable with the ink storage tube, and the tip of the barrel 30 is made a detachable tip so that the ballpoint writing body can be replaced. .

[0022]

When the cap 34 is rotated in one direction with respect to the shaft cylinder 30, the sliding projections 26 of the sliding pieces 21a and 21b slide along the spiral groove 42 with the rotation of the cap, and either one of them is rotated. The sliding piece moves forward, and the other slides back, so that the writing tip of the writing body on the advancing side can be projected from the tip end of the barrel 30. Further, even if the ink storage portion of the writing pen of the ballpoint pen is not deformed, the writing tip portion flexibly shifts, so that the writing tip portion smoothly comes out of the tip opening without disturbing the operation.

When the ballpoint pen writing body 1a protrudes, as shown in FIG. 1, the ball portion of the clip and the bulging portion of the peripheral surface of the barrel are engaged with each other, so that the clip is placed in the breast pocket. And so on.

Next, when the cap 34 is rotated to the other side, the sliding piece 21a retreats, the writing tip of the ballpoint pen writing body 1a enters the barrel 30, and the sliding piece 21b moves forward. At that time, the writing tip is brought into a portable state in which it is accommodated in the barrel 30, and the clip for that state is at a position where the engagement with the bulging portion is released, so that the clip can be easily inserted into a breast pocket or the like. .

When the cap 30 is further rotated, the sliding piece 2
1a is further retracted, the sliding piece 21b is further advanced, and the rib 3
The front end of the writing piece 7a is locked to the rear end of the sliding piece 21b, and the writing tip of the writing pen 1b protrudes from the tip end of the barrel 30. In this state, the clip and the bulge of the peripheral surface of the shaft cylinder are engaged with each other so that the clip cannot be inserted into a breast pocket or the like.

The ballpoint pen writing body 1a is
When the ball valve 16 faces upward, the ball valve 16 is positioned on the ball receiving seat 8 of the valve chamber 7 and seals the guide hole 9.
Even if the ink is written upward and the ink on the back surface of the tip ball 12 of the chip runs out, the ink is caught by the head and does not flow backward. Therefore, when the chip 11 is turned downward, the ink can immediately flow out, and the writing is prevented from being rubbed.
(By the way, in the structure without a ball valve, the ink acts in the backward direction when writing upwards, so that air is trapped in the chip and the ink does not follow immediately when writing downwards, causing scuffing.)

In a writing state in which the chip 11 is directed downward, the ball valve 16 abuts on one of the rear ends of the chip 11 in a biased state, and the other side has a flow path through which ink can flow into the chip 11. Then, the ink 18 that has entered the valve chamber 7 from the ink storage tube 17 through the guide hole 9 is guided to the back of the tip ball 12. In this state, the tip ball 12 is brought into close contact with the inner edge of the chip holding portion by the pressing of the rod shaft portion 15, so that the direct current of the ink is prevented. In addition, the tip ball 12 slightly retreats due to the writing pressure, so that a gap is created and ink can flow out. By writing, the rotation of the tip ball 12 allows the ink to flow smoothly, and there is no dent and writing with high handwriting density is possible. Becomes On the back surface of the tip ball 12, there is a channel (a seat for the tip ball having a plurality of ink inflow grooves penetrating toward the inner hole of the chip), and the rod shaft portion 15 passes through the center hole of the channel. The ink in the chip is guided to the back of the tip ball 12 through the ink inflow groove and the gap between the center hole and the rod shaft portion 15.

[0028]

The construction and operation of the double-type writing instrument of the present invention are as described above. A plurality of large, non-deformable ballpoint pen writing bodies are mounted so that the tip of the writing can be smoothly protruded and retracted. In addition, since the clip cannot be inserted into a breast pocket or the like while the writing tip is protruding, the projected state of the writing tip is easily recognized, and damage to the human body and clothes due to the sharp edge of the writing tip is prevented, and In addition, since there is no need to worry about soiling of clothes and the like, it is simply composed of the required number of writing bodies, a cap, and a barrel, so that it can be provided at a low cost. In addition, the writing tip of a medium-viscosity water-based and low-viscosity oil-based ball-point pen having a mechanism that allows the writing tip to maintain the drying resistance, remove the seal cap and leave the seal cap, and prevent direct current or backflow of ink. It is possible to provide a convenient dual-type writing instrument equipped with a plurality of writing instruments.

[Brief description of the drawings]

FIG. 1 is a vertical cross-sectional view showing the entirety of a double-type writing instrument according to an embodiment of the present invention, which is partially not shown. In addition, two kinds of ballpoint pen cursives are mounted.

FIG. 2 is an external view of a main part showing a rear part of a shaft cylinder part.

FIG. 3 is a sectional view of a cap.

FIG. 4 is a longitudinal sectional view of a ballpoint pen writing body used in the present invention.

[Explanation of symbols]

 1a Ballpoint pen writing body 1b Ballpoint pen writing body 2 Joint 3 Front shaft part 4 Bendable part 5 Rear shaft part 6 Flange part 7 Valve chamber 8 Ball receiving seat 9 Guide hole 10 Inner hole part 11 Tip 12 Tip ball 13 Shaft part 14 Spring 15 Rod shaft part 16 Ball valve 17 Ink storage tube 18 Ink 19 Follower 20 Follower rod 21a Sliding piece 21b Sliding piece 22 Shaft part 23 Vent groove 24 Rear shaft part 25 Guide rib 26 Sliding protrusion 30 Shaft tube 31 Tube portion 32a Projection Part 32b slit part 33 bulge part 33a concave part 33b convex part 34 cap 35 concave groove 36 crown 37 annular rib 37a rib 38 clip 38a base 39 ball part 40 convex part 41 concave part 42 spiral groove 42a wide part 42b wide part

Claims (6)

[Claims] 1. A double-type writing instrument in which a plurality of ballpoint pen writing bodies are mounted in a barrel, and each of the writing tips can be alternately protruded and retracted from a tip end of the barrel. A ball-point pen writing body arranged so that only the shaft transition is possible, a cap fixed to the shaft cylinder so that it can only rotate, and a slide provided in a spiral groove provided on the inner periphery of the cap so as to interlock with the ball-point pen writing body. By engaging the moving projections and rotating the cap, the ballpoint pen writing body can be moved back and forth, and the ink storage portion of the ballpoint pen writing body is substantially non-deformed, and does not swing in the shaft cylinder space. A compound writing instrument which is fitted and inserted, wherein a portion connecting the ink storage portion and the writing tip portion is formed of a flexibly displaceable bendable portion. 2. A cap extending in a forward direction through an inner hole of a cap, and a rear end of a sliding piece abuts a front end of the cap to engage a writing tip of one ballpoint pen writing body. The dual writing implement according to claim 1, wherein said writing implement is configured to be stopped. 3. A clip having a base fixed to one side surface of the cap and disposed toward the front of the barrel, and a ball provided with a locking portion provided at a forward end of the clip. A bulging portion provided with a locking portion is provided at a predetermined position on the peripheral surface of the barrel to be in contact with, and only when the cap is rotated so that the writing tip protrudes from the tip end of the barrel, the ball portion of the clip. 2. The double writing implement according to claim 1, wherein the engaging portion of the bulging portion and the bulging portion are engaged with each other so that the ball portion of the clip does not separate from the shaft cylinder surface. 4. The writing pen having a tip for holding the tip ball and an ink container tube at the rear, wherein the tip ball is rotated by the rotation of the tip ball during writing and flows out of the writing body with a reduced viscosity. A water-based ballpoint pen ink with so-called shear-thinning viscosity or low-viscosity oil-based ink is filled, and the back end of the ink is filled with a follower made of a grease-like translucent non-drying substance that moves following the consumption of ink accompanying writing. The double-type writing instrument according to claim 1, wherein the writing instrument is formed. 5. The ballpoint pen writing body has a spring provided so that the tip ball always presses and contacts the inner edge of the ball holding portion at the tip of the tip, and the contact state is released during writing. The writing instrument according to claim 4, comprising: 6. The ballpoint pen writing body is provided with a valve chamber in which a ball valve is loosely fitted in contact with a rear end of a chip, and a ball valve is closely attached to a rear portion of the valve chamber to prevent a backflow of ink. 6. The dual writing implement according to claim 5, further comprising a guide hole extending from the ball receiving seat to the ink storage tube.