JPH10217679A - Composite writing utensil - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent an ink back flow and direct flow phenomenon from occurring by arranging a pair of sliding members, in an almost internal contact with the inner periphery of a holder cylinder, then arranging a cam mechanism part for moving the sliding members back and forth alternately and enabling the jutting-out of the ball point part of each of writing members, interlocked with each of the sliding members, in the centrifugal direction, from the tip aperture of the holder cylinder. SOLUTION: The protrusion parts 51a, 51b of sliding members 48a, 48b are slid along a cam groove 35 following the rotation of a rotary shaft 33 by rotating a rear holder 39 into one direction with a medium holder 30, and thereby, either of sliding pieces is moved forward, while the other piece is moved backward to protrude the writing ball point part of the writing member on the forward moving side from the tip aperture of a front holder 58. Even when the ink containing part of a ball point writing member is non-deformed, the writing ball point part can be caused to smoothly come out of and retract into the tip aperture of the front holder 58 without any operating hindrance by making the writing ball point part area movable in the centrifugal direction with the tip aperture and also making the front holder 58 elliptically cylindrical upto the tip aperture.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention comprises two types of ballpoint pen writing bodies filled with low-viscosity ink, and each writing tip can be alternately protruded and retracted from the tip opening by a rotating operation. The present invention relates to a double writing instrument.

[0002]

2. Description of the Related Art In general, there has been 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 retracting mechanism has a built-in return spring for returning the writing body to the inside of the barrel, so the structure is complicated and the number of parts is large,
There is a problem of high cost.

On the other hand, when a medium-viscosity water-based and low-viscosity oil-based ballpoint pen is mounted on a double-sized writing instrument having a normal thickness due to a large ink container tube, the tip of the writing body protrudes without freedom between the writing bodies. The part is not smoothly centered on the tip hole of the barrel, and the operation is hindered, so that the writing tip cannot appear or disappear.
Therefore, there is a disadvantage that the shaft cylinder becomes extremely thick in order to enable the operation and the usability is deteriorated. 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] Aqueous ballpoint pens have a low viscosity of several mPa · S or less, and therefore have the advantage of being able to be written with a light writing pressure, and are characterized by good writing taste. 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. Also, 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 tip is dried and the ink does not flow out, making it impossible to write.

On the other hand, conventionally known oil-based ballpoint pens have a high viscosity of several thousands mPa · S or more of ink, 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, an intermediate viscosity region (a few mPa · S to a few thousand mP) between the above-mentioned water and oiliness
Ballpoint pens for aqueous inks called medium viscosity using the inks of a · S) have 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. 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 is increased, 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.

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. However, the amount of the ink flowing out is increased, and the ink storage tube is required to extend the writing life. It is necessary to increase the diameter of the ink and increase the filling amount of the ink. Also, due to the low viscosity of the ink, if the tip side faces downward and there is a gap between the tip ball and the tip holding portion, the ink will bleed (DC) or the amount of ink flowing out during writing will increase. 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, a medium-viscosity aqueous 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, evaporation of the ink need not be considered. However, in the case of water-based ink, since water is the main solvent, evaporation of water cannot be prevented only by selecting a low vapor pressure solvent.

[0008]

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems of the prior art. That is, two types of writing bodies are mounted in a barrel, and the respective writing bodies are mounted from the tip of the barrel. It is an object of the present invention to provide a double-type writing instrument that allows a writing tip to selectively appear and disappear, and is excellent in manufacturing cost and ease of use. In other words, the ink is filled with low-viscosity ink, no backflow of ink, no DC phenomenon occurs, the drying resistance of the pen tip is maintained, the cap can be removed and the ink can be left unattended. And a mechanism for preventing direct current of ink are provided in a ballpoint pen writing body, and the ballpoint pen writing body is mounted in two types of barrels, and the writing tip of each writing body selectively emerges from the barrel tip. It is possible to provide a double-type writing instrument which is convenient and does not have a risk of soiling clothes and the like.

[0009]

According to the first aspect of the present invention, there is provided a double-type writing instrument in which a tip ball always presses and contacts closely with an inner edge of a ball holding portion at a tip end, and the close contact state is released during writing. And a non-deformable ink receiving tube having a relatively large cross-sectional area in the ink receiving portion. The ink storing portion has a low-viscosity ink (which accompanies writing). An aqueous ballpoint pen ink or a low-viscosity oil-based ink having a so-called shear-thinning viscosity, which is reduced in viscosity by the rotation of the tip ball, is filled, and the rear end of the ink follows the consumption of the ink accompanying writing. In a ball-point pen writing body that is filled with a moving grease-like translucent non-drying substance and a double-point writing tool that is equipped with two types of such ball-point pen writing bodies, A pair of sliding bodies arranged in a substantially cylindrical shape on the inner periphery of the shaft cylinder, facing each other in the longitudinal direction of the cylindrical body, and the sliding bodies are alternately moved back and forth. A writing mechanism is connected to the front of each sliding body, and the tip of each writing body is centered so that it can protrude from the tip end of the barrel in conjunction with the sliding body. It can be haunted.

[0010] The double writing implement according to the second aspect of the present invention is the double writing implement according to the first aspect, wherein a cylindrical portion is provided behind the long cylindrical portion of the center shaft, and an inner hole of the cylindrical portion is provided. A rotating shaft that is rotatably disposed within a range of about 180 degrees with respect to the center shaft and has a cam groove formed on the shaft peripheral surface, and a rotation that is fitted on the outer periphery of the cylindrical portion and protrudes from the rear end of the cylindrical portion. A rear shaft integrally provided at the rear end of the shaft, and a rear shaft rotatably held with respect to the center shaft, and protrusions engaging with the cam grooves of the rotary shaft are formed on the inside facing each other. A pair of sliding bodies are guided in the inner hole of the central shaft so as to be able to move only forward and backward, and the respective sliding bodies can be moved back and forth alternately by rotation of the rotating shaft accompanying rotation of the rear shaft.

According to a third aspect of the present invention, there is provided the double-type writing instrument according to the first aspect, wherein a cylindrical portion is provided behind the long cylindrical portion of the center shaft, and an inner hole of the cylindrical portion is provided. A rotating shaft that is rotatably disposed within a range of approximately 180 degrees with respect to the center shaft and has two protrusions formed in front of the shaft circumferential surface; A rear shaft integrally provided at the rear end of the rotating shaft protruding from the main shaft, and an inclined cam groove that is engaged with the protrusion of the rotating shaft so that the rear shaft is rotatably held with respect to the center shaft. A pair of sliding bodies formed on the inside facing each other are guided by the inner hole of the center shaft so as to be able to move only forward and backward, and the sliding bodies are configured to be able to move back and forth alternately by rotation of the rotating shaft accompanying rotation of the rear shaft. ing.

According to a fourth aspect of the present invention, there is provided the double-type writing instrument according to the second and third aspects, wherein the middle cylindrical long cylindrical portion and the front of the rear shaft are substantially the same long cylindrical shape. Is formed,
A state in which an edge is provided on the long diameter portion side edge of the rear end of the long shaft portion of the middle shaft, a clip is provided on one side surface of the short diameter portion of the rear shaft, and the tip of the writing body protrudes from the tip opening of the barrel. The front end of the clip in the longitudinal direction engages with the edge of the center shaft, making it impossible to attach the clip to a pocket or the like. The distal end of the clip is located at the short diameter portion at the end so that the clip can be attached to a pocket or the like.

[0013]

1 to 7 show a first embodiment of the present invention. In FIG. 1, two ballpoint pen cursives 1
a and 1b are provided. The double-type writing instrument of the present invention is provided with two types of ballpoint pen writing bodies having different ink colors and writing line widths filled with a low-viscosity ink (a so-called water-based or low-viscosity oil-based ink having a shear thinning property). It is.

The double-type writing instrument shown in FIG. 1 includes a front shaft 58 and a center shaft 30 for accommodating a 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 a long 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. 3) 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. However, increasing the rotation angle increases the action, which is a disadvantage in operation. Become. Accordingly, the rotation angle is closer to 180 degrees when the diameter of the barrel is small, and 1 when the diameter is large.
It is selected for design reasons closer to 20 degrees.

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, 54b are formed in the respective insertion holes, and rear end inner holes of ballpoint pen writing bodies 1a, 1b described later are fixed to the outer periphery of the boss. Have been. Vent grooves 55a, 55b are formed on the outer periphery of the bosses 54a, 54b, so that ventilation is possible in the rear end inner holes of the ballpoint pen writing bodies 1a, 1b, and behind the rear parts 50a, 50b. On the inner surface side, projections 51a and 51b are formed for each sliding body to move back and forth by the pressing of the cam groove 35 due to the rotation of the rotating shaft 33. Further, ribs 53a and 53b are provided on the outer periphery of the leading end portions 49a and 49b of the sliding body so as to stop and engage with the guide grooves 56 formed on the inner periphery of the long cylindrical portion 30d of the middle shaft. (The grooves and ribs between them may be replaced with each other.) In addition, the outer periphery of the rear portion 50a, 50b of the sliding body is also provided on the inner periphery of the cylindrical portion 30c of the center shaft for guiding. Ribs 52a, 52 which are detently engaged with the grooves 57
b is provided. (The grooves and ribs between them can be replaced with each other).
The ribs provided on the outer periphery of the sliding members 48a and 48b are engaged with the guide grooves provided on the inner periphery of the center shaft 30, respectively.
a, 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.

FIG. 8 shows a second embodiment. Basically, it is almost the same as the first embodiment, and only the differences will be briefly described. Behind the long cylindrical portion 30d of the central shaft 30, the cylindrical portion 30
a rotating shaft 70 provided in the inner hole of the cylindrical portion 30c so as to be rotatable within a range of approximately 180 degrees with respect to the central shaft 30 and having a projection 71 formed in front of the shaft peripheral surface;
a rear shaft 76 integrally fitted to the rear end of the rotary shaft 70 fitted on the outer periphery of the cylindrical portion and protruding from the rear end of the cylindrical portion, and the rear shaft 76 held rotatably with respect to the center shaft 30. An inclined cam groove 73a which engages with the projection 71 of the rotary shaft 70
A pair of sliding bodies 72a and 72b formed on the inside where the sliding shafts 73b and 73b are opposed to each other are guided by the inner hole of the central shaft 30 so as to be able to move only in the forward and backward directions. It is configured to be able to move back and forth.

The tip portion 75 of the clip 74 provided on one side of the rear shaft 76 is slightly bent, and the
5 is configured to be engaged with the edge 30 e of the center shaft 30. A projection 77 formed on the peripheral surface of the rear shaft 76 is substantially in contact with the inner surface of the distal end portion 75.

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

As shown in FIG. 7, 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. . A spring 14 is inserted into the inner hole of the chip 11, and the rear end of the shaft 13 of the chip is appropriately caulked so that the rear end of the spring 14 cannot be pulled out. (Caulking portion 13a) Also, it is extremely important that the tip ball 12 comes into close contact with the inner surface of the tip holding portion for drying the writing tip and preventing direct current of the ink. Grinding of the inner surface to improve the surface roughness 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.

Further, the tip of the spring 14 becomes a linear rod portion 15, and the tip of the rod portion 15 is
Abuts on the rear end of the device in a pressed state. The tip ball 12 is brought into close contact with the inner edge of the ball holding portion (formed by caulking or the like) of the chip 11 by the pressing.

The joint 2 has a shaft 1 of the tip 11 at the tip.
A front shaft portion 3 for pressing the base 3 and a rear shaft portion 4 for pressing the front end of the ink storage tube 17 are formed. Further, behind the inner hole of the front shaft portion 3, there is a valve chamber 6 into which a ball valve 16 is loosely fitted.
Behind the valve chamber 6, a tapered or spherical ball receiving seat 7 and a guide hole 8 provided eccentrically to the axis are provided, and the inner hole of the rear shaft portion 4 becomes the inner hole of the ink storage tube 17. Communicating. A groove 10 is provided on one side of the inner wall of the valve chamber 6 so that ink flows in the axial direction. The ball valve 16 which is loosely fitted in the valve chamber 6 contacts the state where the tip 11 is directed downward to the rear end of the shaft portion 13 of the chip to form an ink flow path. The ink 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 16 comes into contact with the ball receiving seat 7 to obtain a function of preventing the ink from flowing backward.

The ink container 17 is filled with the ink 18 of the above-mentioned ball-point pen, and the rear end of the ink 18 is a grease-like half that can move following the ink surface as the ink is consumed. A follower 19 made of a transparent non-drying substance is filled. Further, a resin follower rod 20 having a specific gravity substantially equal to that of the follower 19 is immersed in the follower 19 as necessary in order to prevent deformation due to dropping, knock impact or the like. The ink storage tube 17 is made of, for example, a transparent PP resin molded product. Also, the ink storage tube 17
Is selected with a material that has excellent clear drain properties. Further, the ink storage tube can be formed integrally with the joint 2.

[0027]

First, the first embodiment will be described. Center axis 30
When the rear shaft 39 rotates in one direction, the sliding members 48a,
The projections 51a, 51b of 48b 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 writing body on the forward side. The part can be made to protrude from the front end port of the front shaft 58.
Also, even if the ink storage portion of the ballpoint pen writing body 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 it reaches the tip opening. As a result, the writing tip smoothly comes out of the tip end of the front shaft 58 without hindering the operation.

When the ballpoint pen writing body 1a is in a protruding state, as shown in FIG. 1, the tip of the clip 44 is engaged with the edge 30e of the center shaft, so that the clip cannot be inserted into a pocket or the like. Make a state. Next, when the rotary shaft 33 is rotated, the sliding body 48a is retracted, and the writing tip of the ballpoint pen writing body 1a is immersed in the front shaft 58, and the sliding body 48a is rotated.
b moves forward. At this time, the writing tip is brought into a portable state accommodated in the tip shaft 58, and the clip for that state is at the position shown in FIGS. 5 and 6, 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 ballpoint pen writing body 1b projects from the tip opening of the front shaft 58. At this time, the tip of the clip 44 is reengaged with the edge 30e of the center shaft, creating 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. 3 abuts on the rib 30a of the rear shaft to regulate the other rotation.

In a state where the tip 11 is turned upward, the ball valve 16 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 12 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 reverse flow direction by writing upward, so air is trapped in the chip,
Ink does not immediately follow with downward writing, causing rubbing)

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 6 from the ink storage pipe 17 through the guide hole 8 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 A channel (a receiving seat for the tip ball having a plurality of ink inflow grooves penetrating toward the inner hole of the chip) is provided on the back surface of the tip ball 12, and a rod shaft portion 15 passes through a 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.

The second embodiment is basically the same, and the description of the operation is omitted. As described above, according to the embodiment of the present invention, since the shaft cylinder is formed in the shape of a long cylinder, it becomes apparently thick, but since the short diameter portion is gripped and written, the usability is not inferior at all.

[0032]

As described above, the composition and operation of the dual writing instrument of the present invention are as described above. The ink does not flow backward, the DC phenomenon does not occur, the drying resistance of the pen tip is maintained, and the cap can be left without the cap. In addition, two types of ballpoint pen writing bodies using low-viscosity ink that can prevent ink backflow and ink direct current due to drop impact, upward writing, are installed in the two types of barrels, and each of them from the tip mouth of the barrel. A double-type writing instrument in which the writing tip of the writing body can selectively appear and disappear can be provided with a thickness of the shaft body satisfying usability. 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 cross-sectional view showing the entirety of a double-type writing instrument according to a first embodiment of the present invention, which is partially shown in a non-cross-sectional view. In addition, two kinds of ballpoint pen cursives are mounted.

FIG. 2 is a sectional view taken along the line AA in FIG. 1;

FIG. 3 is a sectional view taken along line BB in FIG. 1;

FIG. 4 is a sectional view taken along the line CC in FIG. 1;

FIG. 5 is a front view illustrating an appearance of a main part of the dual-type writing instrument according to the first embodiment of the present invention in a state where a writing tip is housed in a barrel.

FIG. 6 is a top view corresponding to FIG. 5;

FIG. 7 is a longitudinal sectional view of the ballpoint pen writing body 1a.

FIG. 8 is a vertical cross-sectional view showing the whole of the double-type writing instrument according to the second embodiment of the present invention, and is partially shown in a non-cross-sectional view.

FIG. 9 is a sectional view taken along line DD in FIG. 8;

[Explanation of symbols]

 1a Ball-point pen writing body 1b Ball-point 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 Groove 11 Chip 12 Tip ball 13 Shaft part 13a Caulking part 14 Spring 15 Bar shaft part 16 Ball valve 17 Ink storage tube 18 Ink 19 Follower 20 Follower rod 30 Center shaft 30a Rib 30b Step portion 30c Cylindrical portion 30d Long cylindrical portion 30e Edge portion 30f Flat portion 32 Engagement portion 33 Rotating shaft 34 Small diameter portion 35 Cam Groove 36 Large diameter portion 36a Groove 36b Abutment portion 36c Abutment portion 37 Lock portion 38 Detent groove 39 Rear shaft 40 Rotation stop rib 41 Hole portion 42 Lock groove 43 Base portion 44 Clip 45 Ball portion 46 Tip portion 47 Flat portion 48a Sliding body 48b Sliding body 49a Tip 49b Tip 50a Rear 50b Rear 51a Projection 1b Projection 52a Rib 52b Rib 53a Rib 53b Rib 54a Boss 54b Boss 55a Ventilation groove 55b Ventilation groove 56 Guide groove 57 Guide groove 58 Front shaft 59 Locking unit 70 Rotating shaft 71 Projection 72a Slider 72b Slider 73a Cam groove 73b Cam groove 74 Clip 75 Tip 76 Rear shaft 77 Projection

Claims (4)

[Claims] 1. A tip comprising 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 releases the contact when writing. The storage section has a non-deformed ink storage tube having a relatively large cross-sectional area, the ink storage tube is filled with low-viscosity ink, and the rear end of the ink follows the consumption of ink accompanying writing. A ball-point pen writing body that is filled with a moving grease-like follower made of a translucent non-drying substance;
In a compound writing instrument that is loaded with seeds, the shaft cylinder composed of the front shaft and the center shaft is formed as an elongated cylinder,
Each of the sliding members includes a pair of sliding members which are disposed in a substantially inscribed state on the inner periphery of the shaft cylinder so as to be opposed to each other in the longitudinal direction of the long cylindrical shape, and a cam mechanism for alternately moving the sliding members back and forth. Is a compound writing instrument in which a writing element is connected to the front of the writing element so that the tip of each writing element can be protruded and retracted from the tip opening of the barrel in conjunction with the sliding element. 2. A cylindrical portion is provided behind the long cylindrical portion of the center shaft,
A rotating shaft having a cam groove formed in the inner surface of the cylindrical portion and being rotatable at an angle of about 180 degrees with respect to the center shaft, and having a cam groove formed on a circumferential surface of the cylindrical portion; A rear shaft integrally provided at the rear end of the rotary shaft protruding from the rear end of the rotary shaft, and a protrusion that is held rotatably with respect to the center shaft and engages with the cam groove of the rotary shaft. A pair of sliding bodies formed on the inside facing each other are guided by the inner hole of the center shaft so that only the forward and backward movement is possible, and each sliding body can be moved back and forth alternately by the rotation of the rotating shaft accompanying the rotation of the rear shaft. The double writing instrument according to claim 1, wherein the writing instrument is configured. 3. A cylindrical portion is provided behind the long cylindrical portion of the central shaft,
The rotary shaft, which is rotatably disposed in the inner hole of the cylindrical portion at an angle of about 180 degrees with respect to the center shaft, and has projections formed at two places in front of the shaft circumferential surface, is fitted on the outer periphery of the cylindrical portion. And a rear shaft integrally provided at the rear end of the rotary shaft protruding from the rear end of the cylindrical portion, and the rear shaft is rotatably held with respect to the center shaft and engages with the protrusion of the rotary shaft. A pair of sliding bodies, each having an inclined cam groove formed on the inside facing each other, are guided by the inner hole of the center shaft so that only the forward and backward movement is possible, and the sliding bodies alternately move forward and backward by the rotation of the rotating shaft accompanying the rotation of the rear shaft. The dual writing instrument according to claim 1, wherein the writing instrument is configured to be capable of being used. 4. A long cylinder portion of the middle shaft and a front portion of the rear shaft are formed in substantially the same shape of a long cylinder, an edge portion is provided at a side edge of a long diameter portion at a rear end of the long cylinder portion of the middle shaft, and a short diameter of the rear shaft is provided. A clip is provided on one side of the portion, and in a state in which the tip of the cursive writing protrudes from the tip opening of the barrel, the front end in the longitudinal direction of the clip is engaged with the edge of the center shaft to fit the clip into a pocket or the like. Mounting is not possible, and the tip of the clip is located at the short diameter at the rear end of the long cylinder of the middle shaft with the tip of the cursive body stored in the barrel, and it can be attached to pockets etc. 4. The double writing implement according to claim 2, wherein the writing instrument is configured to be formed as follows.