JP3665147B2 - Double writing instrument - Google Patents

Description

[0001]
[Industrial application fields]
The present invention relates to an improvement of a compound writing instrument equipped with a plurality of ballpoint pen writing bodies.
[0002]
[Prior art]
In general, a compound writing instrument is known in which a plurality of writing bodies such as a mechanical pencil and a ballpoint pen are mounted, and the writing tip can be selectively projected and retracted from an axial end.
[0003]
In addition, since the water-based ballpoint pen has a low viscosity of several mPa · S or less, it is advantageous to be able to write with a light writing pressure, and has a feature that the writing quality is good. However, there is a drawback that a direct current phenomenon in which the ink flows gently from the tip of the pen, and a reverse flow phenomenon in which air flows out from the tip of the ballpoint pen and the ink flows out. A method of preventing these phenomena by using a fiber converging body called batting is used.
[0004]
On the other hand, the oil ballpoint pens known in the past have a high resistance when the ball rotates when the ink flows out from the pen tip because the ink used in the ballpoint pen has a high viscosity of several thousand mPa · S or more. There is a drawback of poor writing. In addition, there is a problem that the amount of ink flowing out from the tip during writing is small, there is a blurring phenomenon, the writing line is uneven, the handwriting density is low, and a high writing pressure is required.
[0005]
As an improvement of this oil-based ballpoint pen, recently, a ballpoint pen for water-based ink called medium viscosity using the above-mentioned intermediate viscosity region (several mPa · S to several thousand mPa · S) of water and oil has been developed. This is a ballpoint pen using a relatively low-viscosity aqueous ink having a characteristic that the viscosity is lowered by rotation of the tip ball and the ink flows out smoothly, so-called shear thinning.
As an improvement of the oil-based ballpoint pen, a ballpoint pen using a low-viscosity oil-based ink excellent in drying resistance can be considered.
[0006]
The above-mentioned ballpoint pens using medium-viscosity water-based ink and low-viscosity oil-based ink are both low-viscosity, so when the tip side is faced downward, the ink bleeds when a gap is formed between the tip ball and the chip holding portion. There is a phenomenon that ink tends to flow backward due to a direct current problem, upward writing or impact. If ink causes reverse flow or direct current, there is a risk of soiling clothing. In addition, there is a problem that clothes are soiled when mounted on a writing instrument and inserted into a breast pocket or the like with its writing tip protruding.
[0007]
[Problems to be solved by the invention]
The purpose of the present invention is to maintain the dry resistance of the writing tip, remove the seal cap and leave it to stand, and have a mechanism that makes it possible to prevent direct current and backflow of the ink. Constructs a ballpoint pen cursive body, equipped with multiple large and non-deformable ballpoint pen cursives,
The writing tip can appear and disappear smoothly, and if the writing tip is still protruding, it can not be inserted into a breast pocket, etc. This makes it possible to provide a dual-type writing instrument that does not have to worry about fouling with a simple structure at low cost.
[0008]
[Means for Solving the Problems]
The present invention has a plurality of ball-point pen writing bodies mounted in a shaft cylinder composed of a middle shaft and a tip shaft detachably attached to the tip of the middle shaft, and each writing tip portion is selectively provided at the tip end of the tip shaft. In a double writing instrument that can be alternately projected and retracted , a slit portion is provided on the rear peripheral surface of the central shaft , and a spiral groove is provided on the inner periphery of the rear shaft fixed so as to be rotatable only with respect to the central shaft. By engaging the sliding protrusion provided to be interlocked with the slit portion of the middle shaft and the spiral groove of the rear shaft, and rotating the rear shaft, the ballpoint pen writing body can be moved back and forth. The ink containing portion is substantially undeformed and is inserted into the shaft without swinging, and the portion connecting the ink containing portion and the writing tip is formed by a flexibly displaceable portion.
[0009]
Further, a clip having a base fixed to one side surface of the rear shaft and disposed toward the front of the shaft cylinder, and a ball portion provided with a locking portion at the front portion of the clip are provided and come into contact with the ball portion. A bulging portion having a locking portion is provided at a predetermined position on the peripheral surface of the central shaft, and the rear shaft is rotated so that the writing tip and the bulging portion of the clip bulge only at a position where the writing tip protrudes from the tip opening of the tip shaft. The locking portions of the protruding portions are engaged with each other so that the ball portion of the clip does not separate from the peripheral surface of the central shaft.
[0010]
The ballpoint pen writing body has a tip for holding the tip ball and an ink storage tube on the back, and the so-called shear thinning viscosity flows out into the ink storage tube due to the rotation of the tip ball accompanying writing. A water-based ballpoint pen ink or a low-viscosity oil-based ink is filled, and a follower made of a grease-like translucent non-drying material that moves following the consumption of the ink accompanying writing is filled at the rear end of the ink.
The ball-point pen writing body comprises a spring provided so that the tip ball is always pressed and brought into close contact with the inner edge of the ball holding portion at the tip of the tip, and the close state is released at the time of writing.
The ballpoint pen writing body is provided with a valve chamber in which a ball valve is loosely fitted in contact with the rear end of the chip, and the ball valve is in close contact with the rear portion of the valve chamber to prevent backflow of ink and the ball A guide hole is provided from the receiving seat to the ink storage tube.
[0011]
【Example】
First, FIG. 1 to FIG. 4 show a first embodiment of the present invention. In FIG. 1, two ballpoint pens 1a and 1b are provided.
The dual writing instrument intended by the present invention includes a so-called shear-thinning medium-viscosity aqueous or low-viscosity ball-point pen that is filled with a low-viscosity oil-based ball-point pen ink, and a normal oil-based ball-point pen that is loaded with a large amount of ink. Etc. are used in combination as necessary.
[0012]
First, the ball-point pen writing body 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.
The ink applied to the ballpoint pen is a medium-viscosity aqueous and low-viscosity oil-based ink having so-called shear thinning.
[0013]
The tip 11 is crimped so that the tip ball 12 is rotatably held in a state where the tip ball 12 is substantially in contact with a seat having a channel through which ink can flow. Further, the spring 14 is inserted into the inner hole portion of the tip 11 and the rear end of the tip is caulked appropriately so that the rear end of the spring 14 cannot be extracted. In addition, it is extremely important for the tip ball 12 to be in close contact with the inner surface of the chip holding portion for drying the writing tip and preventing direct current of ink. For this reason, the surface roughness and caulking of the inner surface of the chip holding the tip ball are important. In order to improve the accuracy of close contact, the inner surface is ground and secondary plastic working to increase the caulking accuracy is considered. In addition, surface treatment and the like are considered on the contact surface with the tip ball. Further, the tip of the spring 14 becomes a linear rod shaft portion 15, and the tip thereof abuts against the back surface of the tip ball 12 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.
[0014]
Further, the joint 2 is formed with a front shaft portion 3 for crimping the tip 11 to the tip and a rear shaft portion 5 that is crimped to the front end of the ink containing tube 17, and the space between the front shaft portion 3 and the rear shaft portion 5 is flexible. It is formed of a resin molded product connected integrally with a displaceable bendable portion 4. In addition, 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 transferred to the chip 18. On the other hand, in the upward state, the ball valve 16 is configured to seal the guide hole 9 and prevent backflow of ink.
[0015]
By the way, the cross section of the ink containing tube 17 is substantially D-shaped (not shown), and becomes substantially circular with the two flat portions in contact with each other. Decorate in the hole space without waste. Further, in the case of three, the cross section of the ink containing tube has a substantially fan shape obtained by dividing a circular shape by 120 degrees. Further, the ink containing tube 17 is filled with the above-mentioned medium viscosity aqueous or low viscosity oil-based ink, and further, the rear end of this ink comes into contact with the ink surface as the ink is consumed, and the grease is movable. A follower 19 made of a semitransparent non-drying material is filled. Also, a resin follower rod 20 having a specific gravity substantially equal to that of the follower 19 is immersed in the follower 19.
[0016]
A shaft portion 22 in front of the sliding piece 21a is press-fitted and fixed to the rear end hole of the ink containing tube 17. A ventilation groove 23 is provided on the peripheral surface of the shaft portion 22 to communicate the inside of the ink containing tube 17 with the outside air.
Further, the rear shaft portion 24 of the sliding piece 21a is provided with two pieces 24a, 24b. One side of the piece 24a has a guide rib 25 and a sliding protrusion appropriately bulging on the outer surface of the guide rib 25. 26 is formed. Thus, the ballpoint pen writing body 1a is configured. The ballpoint pen writing body 1b is similarly configured.
[0017]
The compound writing instrument of FIG. 1 has two types of ball-point pen writing bodies, a center shaft 30 that houses the ball-point pen writing body, a front shaft 43 that is fixed to the front of the center shaft 30 by screw joint, and a rotation only behind the center shaft 30. It consists of a rear shaft 34 which is fixed in a possible manner. Further, the rear shaft 34 is removed from the middle shaft 30, and the cursive body is exchanged.
It is also possible to replace the ballpoint pen writing bodies 1a and 1b by removing the front shaft 43 with respect to the middle shaft 30 by making the sliding pieces 21a and 21b and the ink containing tube 17 removable.
[0018]
By the way, the bulging portion 33 is formed at two locations on the outer periphery of the middle shaft 30 slightly rearward, and a locking portion including a convex portion 33b and a concave portion 33a is formed on the front surface of the bulged portion 33.
Further, as shown in FIGS. 1 and 2, a cylindrical portion 31 is provided behind the bulging portion 33, and a circumferential protrusion 32a is further provided on the circumferential surface of the cylindrical portion 31 at the rear end. Two opening slit portions 32b are formed, and the ballpoint pen writing bodies 1a and 1b are inserted into the center shaft 30, and sliding pieces provided at the rear ends of the ballpoint pen writing bodies 1a and 1b in the respective slit portions 32b. The guide rib 25 and the sliding protrusion 26 of 21a, 21b are inserted.
[0019]
Further, as shown in FIG. 3, the rear shaft 34 is a cylinder having a crown 36 closed at the rear end, and a clip 38 connected to a rear outer peripheral side of the cylinder by a base 38a extends forward. ing. Further, a locking portion comprising 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 caused by the circumferential movement of the clip accompanying the rotation of the rear shaft 34 described later. Is engaged with and disengaged from the concave portion 33 a of the bulging portion 33.
Further, a circumferential concave groove 35 is formed on the inner periphery of the front end of the rear shaft 34, and a spiral groove 42 is formed on the inner periphery of the rear end thereof. An annular rib 37 extending from the crown 36 is formed behind the crown.
[0020]
As described above, the rear shaft 34 is fitted into the cylindrical portion 31 of the shaft cylinder, and the protrusion 32a is engaged with the concave groove 35 by elastic deformation, so that the rear shaft 34 can rotate with respect to the shaft cylinder 30 and is prevented from coming off. At that time, the sliding protrusions 26 of the sliding pieces 21a and 21b are respectively engaged with the spiral grooves 42 by elastic deformation, and the ballpoint pen writing bodies 1a and 1b are moved back and forth alternately by the rotation of the rear shaft 34 with respect to the middle shaft 30. Thus, each writing tip can be projected and retracted from the tip opening of the tip shaft 43. At this time, as described above, the ink storage tube 17 is not deformed, but can be smoothly operated by the bendable portion 4.
[0021]
5 and 6 show a second embodiment of the present invention.
Incidentally, in the first embodiment, the rear shaft is rotated in the range of about 180 degrees with respect to the middle shaft so that the tip of each ball-point pen writing body can be projected and retracted from the tip of the shaft tube. In the example, the rear shaft 50 is rotated approximately 360 degrees with respect to the middle shaft 30b. In this case, the rotational resistance can be reduced, so that the stroke of the cursive body can be increased. Therefore, there is an advantage that the tip shape of the shaft cylinder can be designed smartly. Moreover, the bulging part 53 may be one place.
[0022]
[Action]
When the rear shaft 34 is rotated in one direction with respect to the middle shaft 30, the sliding protrusions 26 of the sliding pieces 21a and 21b slide along the spiral groove 42 along with the rotation of the rear shaft. The top is advanced, the other is retracted, and the writing tip of the forward writing body can be protruded from the tip opening of the tip shaft 43. Further, even if the ink containing portion of the ballpoint pen writing body is not deformed, the writing tip portion is flexibly changed, so that the writing tip portion appears and disappears smoothly from the tip opening without being hindered in operation.
[0023]
In the state where one ballpoint pen 1a protrudes, as shown in FIGS. 1 and 5, the ball part of the clip and the bulging part of the peripheral surface of the shaft cylinder are engaged with each other so that the clip is in the breast pocket. It will be in a state that can not be attached.
[0024]
Next, when the rear shaft 34 is rotated in the other direction, the sliding piece 21a moves backward, the writing tip portion of the ballpoint pen writing body 1a is immersed in the tip opening of the front shaft 43, and the sliding piece 21b moves forward.
At that time, the writing tip portion is in a portable state in which it is accommodated in the front shaft 43, and the clip for that state becomes a position where the engagement with the bulging portion is released and can be easily inserted into the breast pocket or the like. .
[0025]
When the rear shaft 34 is further rotated, the sliding piece 21 a is further retracted, the sliding piece 21 b is further advanced, and the writing tip portion of the ballpoint pen writing body 1 b protrudes from the tip opening of the front shaft 43. In the clip for that state, the ball part and the bulging part of the peripheral surface of the shaft cylinder are engaged with each other so that the clip cannot be inserted into the breast pocket or the like.
[0026]
Further, the ball pen writing body 1a is written in an upward direction since the ball valve 16 is positioned at the ball receiving seat 8 of the valve chamber 7 to seal the guide hole 9 in a state where the tip 11 is directed upward. Even if the ink on the back surface of the tip ball 12 runs out, the head is applied to the ink and does not flow backward. Accordingly, when the tip 11 is turned downward, the ink can immediately flow out, and dripping is prevented by writing. (By the way, in the structure that does not have a ball valve, the ink works in the reverse flow direction when writing upwards, so air is entrained in the tip, and the ink does not follow immediately when writing downwards, causing drooling)
[0027]
In the writing state with the tip 11 facing downward, the ball valve 16 abuts against one of the rear ends of the tip 11, and the other is provided with a flow path through which ink can flow into the tip 11. The ink 18 that has entered the valve chamber 7 from the storage tube 17 through the guide hole 9 is guided to the back surface 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 direct current of ink is prevented. In addition, the tip ball 12 is slightly retracted by the writing pressure, so that a gap is created and ink can flow out. By writing, the tip ball 12 rotates smoothly and the ink flows out smoothly. It becomes.
On the rear surface of the tip ball 12, there is a channel (a tip ball receiving seat having a plurality of ink inflow grooves penetrating toward the chip inner hole), and a rod shaft portion 15 passes through the center hole of the channel. The ink in the chip is guided to the back surface 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 invention's effect】
The structure and operation of the dual-type writing instrument of the present invention is as described above, and a mechanism that can prevent the direct current and backflow of ink can be maintained by removing the seal cap while maintaining the dry resistance of the writing tip. It has a medium-viscosity aqueous, low-viscosity oil-based ballpoint pen writing body, equipped with multiple large and non-deforming ballpoint pen writing bodies, and the writing tip can be smoothly infested,
Since the clip cannot be inserted into the breast pocket etc. with the writing tip protruding, the protruding 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. No worries about fouling etc.
Since it is simply composed of the required number of cursive letters, the front axis, the middle axis, and the rear axis, it can be provided at low cost.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view showing the entirety of a dual writing instrument according to a first embodiment of the present invention, and a part thereof is not shown in cross section. Two types of ballpoint pens are mounted.
FIG. 2 is a main part external view showing a rear part of a central shaft.
FIG. 3 is a cross-sectional view of a rear shaft.
FIG. 4 is a longitudinal sectional view of a ballpoint pen writing used in the present invention.
FIG. 5 is a longitudinal sectional view showing the entirety of a dual writing instrument according to a second embodiment of the present invention, and a part thereof is not shown in cross section.
FIG. 6 is a sectional view of a rear shaft used in the second embodiment.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1a Ball-point pen writing body 1b Ball-point pen writing body 2 Joint 3 Front shaft part 4 Bendable part 5 Rear shaft part 6 Ridge 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 portion 16 Ball valve 17 Ink storage tube 18 Ink 19 Follower 20 Follower rod 21a Sliding piece 21b Sliding piece 22 Shaft portion 23 Venting groove 24 Rear shaft portion 24a Piece portion 24b Piece portion 25 Guide rib 26 Sliding projection portion 30 30a Female thread 30b Middle shaft 31 Tube portion 32a Projection portion 32b Slit portion 33 Swelling portion 33a Concavity 33b Convex portion 34 Rear shaft 35 Concave groove 36 Crown 37 Ring rib 38 Clip 38a Base 39 Ball portion 40 Convex portion 41 Concave portion 42 Spiral groove 43 Lead shaft 43a Male screw 50 Rear shaft 51 Spiral groove 52 Spiral groove 53 Swelling part

Claims (5)

A plurality of ballpoint pens are mounted in a shaft cylinder consisting of a center shaft and a tip shaft detachably attached to the tip of the center shaft, and each writing tip part appears and disappears alternately from the tip end of the tip shaft. In the dual writing instrument that was made possible,
A slit portion is provided on the rear circumferential surface of the center pole, the inner periphery of the shaft after being only secured rotate relative axial rod provided with a helical groove, the middle axle of the slide protrusions provided to work with the ballpoint cursive The ball pen writing body can be moved back and forth by rotating the rear shaft by engaging with the slit groove of the rear shaft and the spiral groove of the rear shaft, and the ink containing portion of the ball pen writing body is substantially undeformed and within the shaft. A compound writing instrument that is inserted without swinging, and wherein a portion that connects the ink containing portion and the writing tip portion is formed of a bendable portion that can be flexibly displaced. A clip whose base is fixed to one side of the rear shaft and arranged toward the front of the shaft cylinder, and a ball portion provided with a locking portion at the front portion of the clip is provided, and a central shaft circumference that comes into contact with the ball portion A bulging part with a locking part is provided at a predetermined position on the surface, and the ball part and the bulging part of the clip are only in a state where the writing shaft tip part protrudes from the tip opening of the front axle by rotating the rear shaft. 2. The dual writing instrument according to claim 1, wherein the engaging portions are engaged with each other so that the ball portion of the clip is not separated from the peripheral surface of the central shaft. The above-mentioned ballpoint pen writing body has a tip for holding the tip ball and an ink storage tube at the back, and the so-called shear thinning is performed in which the viscosity is lowered and flows out by rotation of the tip ball accompanying writing in the ink storage tube. Filled with water-based ballpoint pen ink or low-viscosity oil-based ink, and filled with a follower made of grease-like translucent non-drying material that moves following the ink consumption accompanying writing at the trailing edge of the ink The compound writing instrument according to claim 1. 4. The ballpoint pen writing body comprises a spring provided so that the tip ball is always pressed and brought into close contact with the inner edge of the ball holding portion at the tip of the tip, and the close state is released at the time of writing. Double writing instrument. The ball-point pen writing body is provided with a valve chamber in which a ball valve is loosely fitted in contact with the rear end of the chip, and the ball valve is in close contact with the rear portion of the valve chamber to prevent backflow of ink and the ball receiving seat 5. A double writing instrument according to claim 4, wherein a guide hole is provided to communicate with the ink storage tube.

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