JP3583219B2 - Double writing instrument - Google Patents

Description

[0001]
[Industrial applications]
TECHNICAL FIELD The present invention relates to a double-type writing instrument equipped with a plurality of substantially non-deformable writing objects, and each of which allows a writing tip to easily come out and in through a tip end of a shaft.
[0002]
[Prior art]
2. Description of the Related Art In general, 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 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.
Further, the conventional retracting mechanism has a problem that the structure is complicated, the number of parts is large, and the cost is high because the return spring for returning the writing body into the shaft cylinder is built in. Further, the space for incorporating the mechanism is large, and the degree of freedom of the refill shape is small.
[0003]
On the other hand, medium-viscosity water-based and low-viscosity oil-based ballpoint pens have thick ink storage tubes. The center of the writing tip is not smoothly centered on the tip end of the cylinder, so that the operation is hindered and the tip of the writing tip cannot appear or disappear. Therefore, the shaft cylinder becomes extremely thick in order to enable the operation, and there is a disadvantage that portability and usability deteriorate.
[0004]
The water-based 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 characteristic of good writing taste. However, there is a drawback that a direct current phenomenon in which the ink flows gently 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 easily occur. A method of preventing these phenomena by using a bundle of fibers called batting is used.
Further, if left in a cap-off state, there is a problem that the vapor pressure of the solvent is high and the solvent is leaked, so that the leading end is dried and the ink does not flow out, making it impossible to write.
[0005]
On the other hand, conventionally known oil-based ball-point pens have high resistance when the ball rotates when the ink flows out of the pen tip due to the high viscosity of the ink used for it being several thousand mPa · S or more. There is a drawback that writing is bad. 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 ball-point pen, recently, a ball-point pen for water-based ink called medium viscosity using an ink having an intermediate viscosity region between the above-mentioned water-based and oil-based (several mPa · S to several thousand mPa · S) has been developed. This is a ball-point pen using a relatively low-viscosity water-based ink having a characteristic that the viscosity is reduced by the rotation of the tip ball and the ink flows smoothly, that is, a so-called shear thinning property. However, since this ink has a drawback that the ink easily dries, a cap for sealing the writing tip is usually required. In addition, the amount of outflow of ink increases, and it is necessary to increase the diameter of the ink storage tube and increase the amount of ink to be filled in order to extend the writing life.
[0006]
As an improvement of the above-mentioned oil-based ballpoint pen, a ballpoint pen using a low-viscosity oil-based ink having excellent drying resistance can be considered. However, the outflow of the ink is increased, and the diameter of the ink storage tube is increased in order to extend the writing life. It is necessary to increase the thickness and the filling amount of the ink. In addition, since the viscosity of the ink is low, if the tip side faces downward and a gap is formed between the tip ball and the tip holding portion, the ink bleeds (direct current) or the amount of ink flowing out during writing increases. There are drawbacks.
[0007]
Since both the above-mentioned medium-viscosity aqueous ink and low-viscosity oil-based ink have low viscosities, there is a phenomenon that the ink easily flows backward or direct current. If the ink causes backflow or direct current, there is a risk of soiling clothes and the like. In addition, there is a drawback that handwriting is apt to occur due to drop or knock impact.
In addition, there is also a problem that clothes are stained when the device is mounted on a writing instrument and inserted into a breast pocket or the like with the writing tip protruding.
In addition, a medium-viscosity water-based ball-point pen is usually filled with a grease-like translucent non-drying substance called a follower at the rear end of an ink storage tube. What is necessary is just to consider the reduction of evaporation from the gap. For example, if a solvent having a considerably low vapor pressure such as an oil-based ballpoint pen is mainly used, the evaporation of the ink need not be considered. However, in the case of the water-based ink, water is the main solvent, and therefore, evaporation of water cannot be prevented only by selecting a low vapor pressure solvent.
[0008]
[Problems to be solved by the invention]
SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems of the prior art, that is, a plurality of substantially non-deformed writing bodies are mounted in a shaft, and a writing tip of each writing body easily comes out of a shaft tip opening. An object of the present invention is to provide a double-type writing instrument which is made possible and which is excellent in portability and usability.
In addition, there is no backflow of ink and no direct current phenomenon, the drying resistance of the pen tip is maintained and the cap can be removed and left alone, and the impact of drop impact, reverse flow of ink due to upward writing and direct current of ink are prevented. Construct a cursive medium of medium viscosity aqueous, low viscosity oily ballpoint pen with a mechanism,
A plurality of writing bodies having at least one ballpoint pen writing body are mounted on the shaft, and the writing tip of the ballpoint pen writing body is protruded and cannot be inserted into a breast pocket or the like, thereby contaminating clothes. It is possible to provide a convenient double-type writing instrument without any.
[0009]
[Means for Solving the Problems]
The dual writing instrument of the present invention is a multiple writing instrument in which a plurality of writing elements are mounted on a shaft, and each writing tip can be alternately protruded and retracted from a tip opening. The tip is swingably inserted into the shaft without swinging, and the tip is swingably provided at the tip of the shaft. It is characterized by being configured to protrude from the end opening.
[0010]
An aqueous ballpoint pen having a so-called shear-thinning viscosity, which has a tip for holding the tip ball and an ink storage tube in the rear, and the viscosity of the tip ball is reduced and flows out by rotation of the tip ball during writing into the ink storage tube. A ballpoint pen writing body that is filled with ink or a low-viscosity oil-based ink and is filled with a follower made of a grease-like translucent non-drying substance that moves at the rear end of the ink following consumption of the ink accompanying writing. A plurality of cursives including at least one are mounted.
[0011]
In addition, two types of ballpoint pen writing bodies are mounted, and a front shaft, a rear shaft, and an inner hole of the rear shaft are disposed so as to be rotatable within a range of about 180 degrees with respect to the rear shaft, and are provided on a shaft peripheral surface. A rotating shaft with a cam groove, an operating body fixed to the rear end of the rotating shaft protruding from the rear end of the rear shaft, and the operating body and the rotating shaft held only rotatable with respect to the rear shaft, A pair of sliding pieces formed on the inside where the projections engaging with the cam grooves of the rotary shaft are respectively opposed are guided by the inner hole of the rear shaft so as to be able to move only forward and backward, and in front of each sliding piece. Each writing body is provided so as to be linked with the sliding piece, and each of the sliding pieces alternately moves back and forth by the rotation of the rotation shaft accompanying the rotation of the operating body, so that each writing body moves back and forth. It is characterized by comprising.
[0012]
In addition, a clip extending from one side of the operating body toward the front of the rear shaft, and a bulging portion provided at a predetermined position on the rear shaft peripheral surface in contact with the forward end of the clip are provided, and the operating body is rotated. Only when the writing tip protrudes from the tip opening, the forward end of the clip is concealed by the recess provided in the bulging portion so that the clip cannot be easily inserted into the breast pocket or the like. Features.
[0013]
Also, in the writing pen of a ball-point pen, the tip ball always has a spring provided so as to press and contact the inner edge of the ball holding portion at the tip end of the tip, and to release the close contact during writing.
Further, a valve chamber in which a ball valve is loosely fitted is provided in contact with the rear end of the chip, and a ball valve is closely attached to the rear of the valve chamber to prevent a backflow of ink. A guide hole is provided to communicate with the tube.
[0014]
【Example】
First, FIGS. 1 to 5 show a first embodiment of the present invention. In FIG. 1, two ballpoint pen writing bodies 1a and 1b are provided.
The double-type writing implement intended by the present invention is a so-called water-based liquid having a so-called shear thinning property, or a ball-point writing body filled with a low-viscosity oil-based ball-point pen ink, a normal oil-based ball-point writing body, a mechanical pencil, or the like, if necessary. Is used.
[0015]
1 includes a front shaft 49 and a rear shaft 30 that house a portion of a writing tool mechanism located at a front portion, and an operating body 42 disposed at a rear end of the rear shaft. A female screw 49a is formed on the inner periphery of the rear portion of the front shaft 49.
A male screw 32 is formed at a front portion of the rear shaft 30, and is screwed with the female screw 49a of the front shaft 49, and is removed as necessary to replace a writing body.
Further, a spherical shaft support 49b is formed at the tip of the tip shaft 49 on the circumference or at a required portion on the circumference, and corresponding to the inside of the tip 50 having the tip mouth 50b. A groove 50a is formed in the periphery to engage with the shaft support 49b, and in a state where the grooves 50a are elastically engaged with each other, the lip 50 is prevented from coming off and swingably coupled to the tip of the front shaft 49. Is done. There are various means for connecting the front shaft and the lip portion. For example, it is also possible to configure a structure in which a ring member or an elastic body is interposed between the front shaft and the lip portion.
[0016]
Further, a rib 30a for preventing rotation is formed on the inner periphery of the rear end of the inner hole of the rear shaft 30 for restricting a rotation range of a rotating shaft 33, which will be described later, and a step portion 30b is provided. Four guide ribs 31 formed in the axial direction at 90 ° intervals are formed on the front inner peripheral portion.
In addition, mountain-shaped bulging portions 39 are formed at three locations on the outer periphery of the rear shaft 30 slightly rearward, and concave portions 40a and 40b are provided at the centers of the two bulging portions.
[0017]
The rotating shaft 33 has a small diameter portion 34 in front of the large diameter portion 36, and a 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 the outer periphery in front of the shaft portion, and a detent groove 38 is provided at a required position at the rear end. . A groove 36a is formed on the peripheral surface of the large-diameter portion 36 so that the rib 30a engages with the rear shaft 30 to regulate the rotation of the rotation shaft 33 within a range of approximately 180 degrees.
It should be noted that increasing the rotation angle of the rotation shaft 33 has the advantage that the rotation resistance is reduced and operation becomes easier, but the fact that the action is increased by increasing the rotation angle is a disadvantage in operation. Therefore, when the diameter of the shaft body is small, the rotation angle is selected closer to 180 degrees, and when the diameter is larger, the rotation angle is closer to 120 degrees.
[0018]
The operation body 42 is formed of a crown 43 and a clip 44 extending forward from one side surface of the outer periphery of the crown 43. A ball portion 45 is provided on the inner side of the clip 44, a hole 43a is provided in front of the crown, a circumferential locking groove 42a is provided in a front peripheral surface of the hole, and a rotation stop rib is provided in a required position on a rear peripheral surface. 41 are provided.
[0019]
Insertion holes 48a, 48b are provided in front of the sliding pieces 46a, 46b, and in the respective insertion holes, locking portions 51a, 51b of inward ridges for fixing rear ends of ballpoint pen writing bodies 1a, 1b described later. Is provided. Further, on the rear inner surface side, 47a and 47b are formed for each sliding piece to move back and forth by pressing the cam groove 35 due to the rotation of the rotating shaft 33.
Grooves 53a, 53b are provided on the outer periphery of the sliding pieces 46a, 46b so as to stop and engage with the guide ribs 31 of the rear shaft 30.
Accordingly, the grooves 53a, 53b provided on the side surfaces of the sliding pieces 46a, 46b engage with the guide ribs 31, respectively, so that the sliding pieces 46a, 46b are smoothly moved back and forth. The cross-sectional shapes of the sliding pieces 46a and 46b are substantially D-shaped. Therefore, there is an advantage that a complicated structure for mounting a guide cylinder having two opposing guide grooves, which is often shown in the conventional example, is not required.
The sliding pieces 46a and 46b are in contact with each other on their flat sides, but in order to make the sliding between them smoother, a guide projection 52b is provided on the sliding piece 46b, and a guide projection 52b is provided on the sliding piece 46a. A guide groove 52a for fitting is provided.
[0020]
The rotating shaft 33 is inserted into the inner hole of the rear shaft 30 with the projections 47a, 47b of the sliding pieces 46a, 46b engaged with the cam grooves 35, and the rear end of the large diameter portion 36 is connected to the rear shaft. The operation body 42 is fixed to the rear end shaft portion of the rotating shaft 33 while being in contact with the step portion 30a.
At this time, the locking portion 37 is engaged with the locking groove 42a of the crown 43, the rotation stopping groove 38 is engaged with the rotation stopping rib 41 of the crown, and the rotating shaft 33 and the operating body 42 are integrally fixed. Then, by rotating the operating body 42 with respect to the rear shaft 30, the rotating shaft 33 is rotated, and one of the sliding pieces is moved forward and the other is moved backward.
Further, the rear ends of the ballpoint pen writing bodies 1a, 1b are fixed to the insertion holes 48a, 48b of the sliding pieces 46a, 46b, and the front shaft 49 is fixed in front of the rear shaft 30.
[0021]
When one of the cursive writings is a mechanical pencil, it is necessary to shift the rotation axis 33 in order to draw out the lead. As a means for this, a return spring may be provided between the rear end of the rear shaft 30 and the inner stage of the operating body 42 so that the axial movement of the operating body is interlocked with the rotation axis and the sliding piece.
[0022]
FIG. 6 shows a second embodiment. Basically, it is the same as the first embodiment, and differences will be described in the operation described later.
[0023]
Next, the ballpoint pen writing body 1a will be described. Note that the ballpoint pen writing bodies 1a and 1b have the same configuration, for example, different ink colors.
The ink applied to the ballpoint pen writing material is a water-based, low-viscosity oil-based ink having a so-called shear thinning property.
[0024]
As shown in FIG. 5, the tip 10 is caulked so that the tip ball 11 is rotatably held with the tip ball 11 substantially in contact with a seat having a channel into which ink can flow. Further, a spring 13 is inserted into the inner hole of the chip 10, and the rear end of the shaft 12 of the chip is appropriately caulked so that the rear end of the spring 13 cannot be pulled out. In addition, it is extremely important that the tip ball 11 is in close contact with the inner surface of the tip holding portion for drying the writing tip and for preventing direct current of ink. Therefore, the surface roughness of the tip inner surface holding the tip ball, caulking In order to improve the close contact accuracy, grinding of the inner surface is performed, and secondary plastic working to increase the crimping accuracy is considered. In addition, a surface treatment or the like is taken into consideration for the surface in close contact with the tip ball.
[0025]
Further, the tip of the spring 13 becomes a linear rod portion 14, and the tip of the rod portion 14 contacts the rear end of the tip ball 11 in a pressed state. The tip ball 11 is brought into close contact with the inner edge of the ball holding portion (formed by caulking or the like) of the chip 10 due to the pressing.
[0026]
The front end of the joint 2 has a front shaft portion 3 for pressing the shaft portion 12 of the chip 10 and a rear shaft portion 4 for pressing the front end of the ink container 16.
Further, behind the inner hole of the front shaft portion 3, there is a valve chamber 6 into which a ball valve 15 is loosely fitted. Behind the valve chamber 6, a tapered or spherical ball receiving seat 7 and an axial center are appropriately provided. An eccentric guide hole 8 is provided, and an inner hole of the rear shaft portion 4 communicates with an inner hole of the ink storage tube 16. A groove is provided on one side of the inner wall of the valve chamber 6 so that ink flows in the axial direction. When the tip 10 is turned downward, the ball valve 15 in the valve chamber 6 which is loosely fitted contacts the rear end of the shaft 12 of the tip to form an ink flow path. Then, the ink in the ink storage tube flows into the chip inner hole through the groove, the ink flow path, and the like through the guide hole 8. On the other hand, in the upward state, the ball valve 15 comes into contact with the ball receiving seat 7 to obtain a function of preventing the ink from flowing backward.
[0027]
The ink reservoir 16 is filled with the ink 17 of the above-mentioned ballpoint pen, and the rear end of the ink 17 is a grease-like translucent non-drying material that can move following the ink surface by contact with the ink surface as the ink is consumed. A follower 18 made of a material is filled. Further, a resin follower rod 19 having a specific gravity substantially equivalent to that of the follower 18 is immersed in the follower 18 as needed in order to prevent deformation due to dropping, knock impact or the like. A tail plug 20 is fixed to the rear end of the ink storage tube 16, and a locking portion 51a of an insertion hole provided at the front end of the slide pieces 46a and 46b is provided on the shaft of the rear end of the tail plug. , 51b are provided with locking grooves 22 which are detachably fastened. The tail plug 20 is provided with a ventilation groove 21 for communicating the inside of the ink storage tube 16 with the outside air.
The ink storage tube 16 is, for example, a transparent PP resin molded product. In addition, the ink storage tube 16 is selected from a material having excellent clear drain properties. Further, the ink storage tube may be formed integrally with the joint 2.
[0028]
Further, the ink storage portion of the ink storage tube 16 is a non-deformed one having a relatively large cross-sectional area, and has a substantially D-shaped cross-sectional shape that can be inserted into the rear shaft 30 without waste in the embodiment. I have. Note that the ballpoint pen writing bodies 1a and 1b including the tip 10 and the joint 2 are substantially non-deformed.
[0029]
[Action]
When the operating body 42 is rotated in one direction with respect to the rear shaft 30, the protrusions 47a and 47b of the sliding pieces 46a and 46b slide along the cam groove 35 with the rotation of the rotary shaft 33, and either one of the protrusions 47a and 47b slides. The sliding piece moves forward, and the other slides backward, so that the writing tip of the writing body on the advancing side swings the lip portion 50 and can protrude from the tip port 50b. That is, even when the ballpoint pen writing bodies 1a and 1b are not deformed, the tip 50 is flexibly shifted, so that the operation is not hindered and the writing tip smoothly comes out of the tip 50b.
[0030]
1 and 3, the ball portion 45 of the clip is concealed by the concave portion 40a of the bulging portion 39 of the rear shaft, so that the clip 44 can be easily pulled out. Creates a condition that cannot be inserted into a breast pocket or the like.
[0031]
Next, when the rotating shaft 33 is rotated, the sliding piece 46a retreats, the writing tip of the ballpoint pen writing body 1a enters the mouth 50, and the sliding piece 46b moves forward. At this time, the writing tip is in a portable state in which it is accommodated in the lip, and the clip for that state is at the position 44a shown in FIG. 3 and can be easily inserted into a breast pocket or the like.
[0032]
When the rotating shaft 33 is further rotated, the sliding piece 46a is further retracted, the sliding piece 46b is further advanced, and the writing tip of the writing pen 1b of the ball-point pen projects from the tip port 50b of the tip 50. The clip corresponding to this state is at the position 44b shown in FIG. 3 and is concealed by the concave portion 40b of the bulging portion, so that the clip 44 cannot be easily inserted into the breast 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. 4 abuts on the rib 30a of the rear shaft to regulate the other rotation.
[0033]
In the second embodiment shown in FIG. 6 described above, the swelling portion 61 of the rear shaft 60 is provided with an oblique locking concave portion 62 so that the bent front end portion 65 of the clip 64 can be formed with the writing front end portion protruding. The clip is engaged with the locking recess 62 so that the clip cannot be inserted into a breast pocket or the like at all.
The shape of the clip is not limited to the shape of the embodiment. For example, if the locking concave portion is formed in a spherical groove, a dovetail groove, or the like, and the tip or the ball portion of the clip to be engaged is formed in a shape to engage with it, However, it does not spread and makes a state where the clip cannot be inserted in the breast pocket at all.
[0034]
Further, in the state where the tip 10 is directed upward, the ball valve 15 is positioned on the ball receiving seat 7 of the valve chamber 6 and seals the guide hole 8 in the ballpoint pen writing body 1a. Even if the ink on the back surface of the tip ball 11 runs out, the ink is caught by the head and does not flow backward. Therefore, when the chip 10 is turned downward, the ink can immediately flow out, thereby preventing writing from occurring. (By the way, in the structure without the ball valve, the ink acts in the reverse flow direction when writing upwards, so that air is trapped in the chip, and the ink does not follow immediately when writing downwards, resulting in rubbing.)
[0035]
In a writing state in which the tip 10 is directed downward, the ball valve 15 abuts on one of the rear ends of the tip 10 in a state of being biased, and the other side has a flow path through which ink can flow into the tip 10. The ink 17 that has entered the valve chamber 6 from the housing pipe 16 through the guide hole 8 is guided to the back of the tip ball 11.
In this state, the tip ball 11 is brought into close contact with the inner edge of the chip holding portion by the pressing of the rod shaft portion 14, so that direct current of ink is prevented. In addition, the tip ball 11 is slightly retracted by the writing pressure, so that a gap is generated so that ink can flow out. By writing, the rotation of the tip ball 11 allows the ink to flow smoothly, and there is no dent and writing with high handwriting density is possible. It becomes.
[0036]
On the back surface of the tip ball 11, 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 a rod shaft portion 14 passes through the center hole of the channel. The ink in the chip is guided to the back surface of the tip ball 11 through an ink inflow groove and a gap between the center hole and the rod shaft 14.
[0037]
【The invention's effect】
The configuration and operation of the double-type writing instrument of the present invention are as described above. By swinging the tip, the substantially non-deformed writing body tip can easily appear and disappear, and a convenient double-type writing instrument is portable and easy to use. Can be provided with the thickness of the shaft body satisfying the above.
In addition, it is equipped with a ballpoint pen writing material using water-based, low-viscosity oil-based ink with so-called shear-thinning, no writing, no drawing lines, no writing scratches, and no need for a cap, and the writing tip is unnecessary. It is possible to appear and disappear, and it is possible to prevent an accident that stains the inside of the shaft cylinder, hands, clothes, and the like due to the direct current of ink, the upward writing, knocking, and the reverse flow of ink with respect to the impact of dropping.
Further, in the state where the operating body is rotated and the writing tip protrudes from the tip end of the tip, the tip of the clip is hidden by the recess provided in the bulging portion, so that the clip can be easily or completely removed. Since it cannot be inserted into the breast pocket or the like, the writing tip is not inserted into the breast pocket or the like while protruding, so that an accident that stains clothes is prevented.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view showing the entirety of a double-type writing instrument according to a first embodiment of the present invention, which is partially not shown in section. In addition, two kinds of ballpoint pen cursives are mounted.
FIG. 2 is a cross-sectional view taken along the line CC in FIG. 1, but shows a state in which a writing body is not fixed to the sliding piece 46a.
FIG. 3 is a sectional view taken along line BB in FIG. 1; Also, the position of the clip accompanying the rotation of the operating body is shown.
FIG. 4 is a sectional view taken along the line AA in FIG.
FIG. 5 is a longitudinal sectional view of the ballpoint pen writing body 1a.
FIG. 6 is a longitudinal sectional view showing a rear half portion of the double-type writing instrument according to the second embodiment, which is partially not shown in section.
[Explanation of symbols]
1a Ballpoint pen writing body 1b Ballpoint pen writing body 2 Joint 3 Front shaft part 4 Rear shaft part 5 Flange part 6 Valve chamber 7 Ball receiving seat 8 Guide hole 9 Inner hole part 10 Tip 11 Tip ball 12 Shaft part 13 Spring 14 Rod shaft part 15 Ball valve 16 Ink storage tube 17 Ink 18 Follower 19 Follower rod 20 Tail plug 21 Vent groove 22 Locking groove 30 Rear shaft 30a Rib 30b Step 31 Guide rib 32 Male screw 33 Rotation shaft 34 Small diameter portion 35 Cam groove 36 Thick Diameter portion 36a Groove 36b Contact portion 36c Contact portion 37 Locking portion 38 Detent groove 39 Swelling portion 40a Depression 40b Depression 41 Detent rib 42 Operating body 42a Lock groove 43 Crown 43a Hole 44 Clip 44a Clip ( position)
44b clip (position)
45 Ball part 46a Sliding piece 46b Sliding piece 47a Projecting part 47b Projecting part 48a Inserting hole 48b Inserting hole 49 Front shaft 49a Female screw 49b Shaft supporting part 50 Tip part 50a Recessed groove 50b Tip opening 51a Locking part 51b Locking part 52a Guide groove 52b Guide protrusion 53a Groove 53b Groove 60 Rear shaft 61 Swelling portion 62 Engagement recess 63 Operating body 64 Clip 65 Tip

Claims (7)

In a double-type writing instrument with multiple writing bodies mounted on the shaft, and each writing tip can be alternately protruded and retracted from the tip mouth, the writing body is substantially non-deformed and swings in the shaft. The tip is pivotally provided at the shaft tip, and the tip is pivoted when the respective writing tip protrudes, and penetrates from the tip opening. A dual-purpose writing instrument characterized by being made. The double-type writing instrument according to claim 1, wherein the mouth portion is supported on the shaft tip so as to be prevented from coming off and to be swingable. An aqueous ballpoint pen having a so-called shear-thinning viscosity, having a tip holding the tip ball and an ink storage tube at the rear, and having a viscosity reduced by the rotation of the tip ball accompanying writing and flowing out into the ink storage tube, At least one ballpoint pen writing body, which is filled with a low-viscosity oil-based ink and is filled with a follower made of a grease-like translucent non-drying substance that moves following the consumption of the ink accompanying writing at the rear end of the ink, is used. The double-type writing instrument according to claim 1, wherein a plurality of writing objects including the book are mounted. Two types of ballpoint pen writing bodies are mounted, and a front shaft, a rear shaft, and an inner hole of the rear shaft are disposed so as to be rotatable within a range of about 180 degrees with respect to the rear shaft, and a cam groove is formed on a peripheral surface of the shaft. , An operating body fixed to the rear end of the rotating shaft projecting from the rear end of the rear shaft, and the operating body and the rotating shaft held only rotatable with respect to the rear shaft, and the rotation A pair of sliding pieces formed on the inner side where the protrusions engaging with the cam groove of the shaft are respectively opposed are guided by the inner hole of the rear shaft so as to be able to move only forward and backward, and slide forward of each sliding piece. Each writing element is provided so as to interlock with the top, and each sliding element is alternately moved back and forth by rotation of a rotation shaft accompanying rotation of the operating body, so that each writing element is moved back and forth. The double-type writing instrument according to claim 1, wherein the writing instrument is used. In the ballpoint pen writing body, the tip ball has a spring provided so as to always press and contact the inner edge of the ball holding portion at the tip end of the tip and to release the close contact state during writing. 3. The dual-purpose writing instrument according to 3. A clip extending from one side of the operation body toward the front of the rear shaft, and a bulging portion is provided at a predetermined position on the rear shaft peripheral surface which is in contact with the forward end of the clip. Only when the distal end protrudes from the distal end opening, the forward end of the clip is hidden by the concave portion provided in the bulging portion, so that the clip is not easily inserted into the breast pocket or the like. The double-type writing instrument according to claim 4, wherein In a ballpoint pen writing body, a valve chamber in which a ball valve is loosely fitted is provided in contact with the rear end of a chip, and a ball receiving seat and a ball receiver for preventing a backflow of ink due to a close contact of the ball valve with the rear of the valve chamber. 6. The dual writing implement according to claim 5, wherein a guide hole is provided from the seat to the ink storage tube.

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