JPH09315087A - Duplex writing instrument - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a duplex writing instrument capable of obtaining a wide space for containing a writing element with the thickness of a barrel satisfying the portability and handling operability. SOLUTION: The duplex writing instrument comprises a tip 7 for holding an end ball 8, an ink containing tube 6 at the rear, an ink occluded material 10 capable of storing ink in the tube 6, and an ink guiding core 9 disposed between the back surface of the ball 8 and the front site of the material. In this case, a ballpoint pen writing element 1a has an ink occluded material container of the tube 6 having a relatively large sectional area and non- deformation so that the site of connecting the tip 2 to the container is easily transferable in the lateral direction to the axis lengthwise direction to carry a plurality of writing elements having at least one ballpoint writing element 1a and the end of the element capable of being selectively telescopically projected from the barrel end.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a water-based ballpoint pen writing body using an ink occlusion body and a normal writing pen such as an oil-based ballpoint pen, or a double-sided writing implement mounted with a mechanical pencil writing body.

[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. Further, the space for incorporating the mechanism is large, and the degree of freedom of the refill shape is small.

On the other hand, a water-based ballpoint pen writing instrument using an ink occlusion body has a large thickness of the ink containing tube. The tip portion is not centered smoothly in the tip hole of the barrel, and the operation is hindered so that the writing tip portion cannot come in and out. Therefore, there is a disadvantage that the shaft cylinder becomes extremely thick to enable the operation, and the portability and the usability are deteriorated.
Another problem is that when it is mounted on a writing instrument and inserted into a breast pocket or the like with its writing tip protruding, the clothes are soiled.

[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 with an ink occlusion body using a fiber bundle is used. Further, the ventilation hole provided for air replacement between the ink storage portion and the outside air is designed so as to suppress the evaporation of ink and prevent the ventilation hole from being blocked by the scattering of ink.

[0005]

SUMMARY OF THE INVENTION An object of the present invention is to solve the above problems of the prior art and to provide a plurality of writing bodies having at least one water-based ballpoint pen writing body using an ink occlusion body in a barrel. The writing tip of each writing body can be selectively retracted from the tip of the barrel, making it inexpensive, portable, and
An object is to provide a compound writing instrument having excellent usability.
Further, it is possible to prevent the clothes from being soiled by preventing the clip from being inserted into a chest pocket or the like when the writing tip portion is protruding.

[0006]

According to the present invention, there is provided a writing instrument comprising:
An ink occluding body capable of storing ink is provided inside the ink accommodating tube having a tip holding the tip ball and an ink accommodating tube at the rear side, and the ink is provided between the back surface of the tip ball and the front part of the ink occluding body. In a water-based ballpoint pen writing body provided with an induction core, the ballpoint pen writing body is a non-deformable one in which the ink occlusion body containing portion of the ink containing tube has a relatively large cross-sectional area, A portion connecting the tip and the ink storage body accommodating portion can be easily displaced in the lateral direction with respect to the axial direction, and a plurality of writing bodies including at least one ballpoint writing body are mounted to selectively move from the tip of the shaft. In addition, the tip of each cursive body can appear.

In a compound writing instrument which is equipped with two types of writing bodies and can selectively project and withdraw each writing tip from the tip opening of the leading shaft, a leading shaft, a rear shaft, and this rear shaft. A rotary shaft that is rotatably arranged in the inner hole of the rear shaft within a range of 120 to 180 degrees and has a cam groove formed on the shaft circumferential surface; and a rear end of the rotary shaft that projects to the rear end of the rear shaft. The operation body fixed to the part,
The operating body and the rotary shaft are rotatably held with respect to the rear shaft, and a pair of sliding pieces formed inside the rear shaft facing the cam grooves of the rotary shaft are provided inside the rear shaft. Each writing body is provided in the hole so that it can be moved back and forth only, and each writing body is provided in front of each sliding piece so as to interlock with the sliding piece. The moving pieces alternately move back and forth, so that the writing tip portions of the respective writing bodies can appear in and out of the leading shaft tip openings.

A clip extending from one side surface of the operating body toward the front of the rear shaft and a bulging portion at a predetermined position on the peripheral surface of the rear shaft facing the front portion of the clip are provided to rotate the operating body. The tip of the clip is hidden by the recess provided in the bulging portion only when the writing tip projects from the tip of the tip shaft so that the clip cannot be easily inserted into a chest pocket or the like. Is characterized by.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS First, FIGS. 1 to 7 show a first embodiment of the present invention. In FIG. 1, two ballpoint pen writing bodies 1a and 1b are provided. The compound writing implement intended by the present invention is a combination of an aqueous ball-point pen writing body using an ink occlusion body and a usual oil-based ball-point pen writing body or mechanical pencil writing body, if necessary.

The compound writing instrument of FIG. 1 comprises a front shaft 49 and a rear shaft 30 for accommodating a portion of the writing instrument mechanism located at the front part, and an operating body 42 arranged at the rear end of the rear shaft. Also, the front shaft 49
A female screw 50 is formed on the inner periphery of the rear portion. Also, the rear shaft 3
A male screw 32 is formed at the front portion of 0, is screwed with the female screw 50 of the front shaft 49, and is removed as necessary to replace a writing body. Further, a rib 30a for preventing rotation, which restricts a rotation range of a rotary shaft 33 described later, is formed on the inner periphery of the rear end of the inner hole of the rear shaft 30, and a step portion 30b is provided,
Further, four guide ribs 31 are formed in the front inner peripheral portion of the rear shaft 30 at intervals of 90 degrees and are formed in the axial direction. Further, mountain-shaped bulges 39 are formed at three locations on the outer periphery of the rear shaft 30 slightly rearward, and recesses 40a and 40b are provided at the centers of the two bulges.

The rotary shaft 33 has a small diameter portion 3 in front of the large diameter portion 36.
4, 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 an outer periphery in front of the shaft portion.
A detent groove 38 is provided at a required position at the rear end.
Further, a groove 36a which engages with the rib 30a and restricts rotation of the rotary shaft 33 within a range of 120 to 180 degrees with the rear shaft 30 is provided on the peripheral surface of the large diameter portion 36.
It should be noted that increasing the rotation angle of the rotary shaft 33 has the advantage of reducing the rotation resistance and making it easier to operate, but the fact that the action increases with the increase of the rotation angle is a drawback in operation. Therefore, the rotation angle is selected closer to 180 degrees when the diameter of the shaft body is small, and closer to 120 degrees when the diameter of the shaft body is large.

The operating body 42 is composed 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 inside the clip 44,
A hole 43a is provided in front of the crown, a circumferential locking groove 42a is provided on the front peripheral surface of the hole, and a rotation stopping rib 41 at a required position is provided on the rear peripheral surface.
Is provided.

Inserting holes 48a and 48b are provided in front of the sliding pieces 46a and 46b, and the engaging portions of the inner protrusions for fixing the rear ends of the ballpoint pen writing bodies 1a and 1b, which will be described later, are provided in the respective inserting holes. 51a and 51b are provided. On the rear inner surface side, there are formed 47a and 47b for each sliding piece to move back and forth by pressing the cam groove 35 accompanying rotation of the rotating shaft 33. Grooves 53a and 53b are provided on the outer periphery of the sliding pieces 46a and 46b so as to stop and engage 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 shape of the sliding pieces 46a, 46b is 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. Although the sliding pieces 46a and 46b are in contact with each other on their flat sides, in order to make the sliding between them smoother, the guide projections 52b are provided on the sliding piece 46b.
6a is provided with a guide groove 52a into which the guide protrusion 52b is inserted.

The rotary shaft 33 is attached to the sliding piece 46.
The protrusions 47a and 47b of a and 46b are inserted into the inner hole of the rear shaft 30 in a state of being engaged with the cam groove 35, and the rear end of the large diameter portion 36 is brought into contact with the step portion 30a of the rear shaft. Rotating shaft 33
The operation body 42 is fixed to the rear end shaft portion. At that time, the locking portion 37 is engaged with the locking groove 42a of the crown 43, and the rotation stopping groove 38 is engaged with the rotation stopping rib 41 of the crown so that the rotary 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 rotary shaft 33 rotates, and at the same time, one sliding piece moves forward and the other sliding piece moves backward. In addition, the insertion holes 48a, 4 of the sliding pieces 46a, 46b
The rear end portions of the ballpoint pen writing bodies 1a and 1b are fixed to 8b, and the front shaft 49 is fixed in front of the rear shaft 30.

By the way, FIG. 8 shows a second embodiment. Basically, it is the same as in the first embodiment, and the differences will be described in the operation described later.

Next, the ballpoint pen writing body 1a mounted on the multiple writing instrument of the present invention will be described. Note that the ballpoint pen writing bodies 1a and 1b have the same configuration, and have different ink colors, for example.

As shown in FIG. 5, the tip 7 is crimped so that the tip ball 8 is rotatably held in a state where the tip ball 8 is substantially in contact with a seat having a channel into which ink can flow. . The tip 7 is crimped to the tip of the joint portion 2, and a bendable portion 3 that can be flexibly and easily displaced in the lateral direction is integrally connected between the rear end of the joint portion 2 and the front end of the ink containing tube 6. ing. Further, an ink occlusion body 10 capable of accumulating ink is provided in the ink containing tube 6, and an ink guide core 9 is arranged between the back surface of the tip ball 8 and the front part of the ink occlusion body 10.

The ball-point pen writing body 1a is a non-deformable one in which the ink occlusion body accommodating portion of the ink accommodating tube 6 has a relatively large cross-sectional area, and is fitted into the rear shaft 30 without waste in the embodiment. It has a substantially D-shaped cross section. Further, a tail plug 12 is fixed to the rear end of the ink containing tube 6, and the engagement of the insertion hole provided in the front part of the above-mentioned sliding pieces 46a, 46b is attached to the shaft portion 13 at the rear end of the tail plug. A locking groove 14 that is detachably fixed to the stoppers 51a and 51b is provided. or,
The tail plug 12 is provided with a ventilation groove 20 that communicates the inside of the ink containing tube 6 with the outside air. In addition, the ventilation passage has an inner hole portion 18,
It is communicated with the lateral holes 16, the peripheral groove 17, and the ventilation groove 20, so that the prevention of the blocking of the ventilation groove passage due to the scattering of the ink and the suppression of the evaporation of the ink are taken into consideration.

[0019]

When the operating body 42 is rotated to one side with respect to the rear shaft 30, the projections 47a and 47b of the sliding pieces 46a and 46b slide along the cam groove 35 as the rotating shaft 33 rotates,
One of the sliding pieces moves forward and the other moves backward, so that the writing tip portion of the writing body on the forward side can be projected from the tip opening of the tip shaft 49. Further, even if the ink storage portion of the writing pen of the ballpoint pen is not deformed, the writing tip portion flexibly shifts, so that the operation is not hindered and the writing tip portion smoothly comes out of the tip end of the front shaft 49.

Also, when one of the ballpoint pen writing bodies 1a is projected, the ball portion 45 of the clip is concealed by the recess 40a of the bulging portion 39 of the rear shaft as shown in FIGS. Then, the clip 44 is made so that it cannot be inserted into a breast pocket or the like.

Next, when the rotary shaft 33 is rotated, the sliding piece 4 is moved.
6a retreats, the writing tip of the ballpoint pen writing body 1a enters the front shaft 49, and the sliding piece 46b moves forward. At that time, the writing tip is in a portable state with the tip shaft 49 accommodated in the front shaft 49, and a clip for that state is shown in FIG.
It becomes the position 4a and can be easily inserted into a breast pocket or the like.

When the rotary shaft 33 is further rotated, the sliding piece 46
a further retreats, the sliding piece 46b further advances, and the writing tip of the ballpoint pen writing body 1b projects from the tip opening of the front shaft 49. The clip for that state is 44b shown in FIG.
The clip 44 is located at a position and is hidden by the recess 40b of the bulging portion, so that the clip 44 cannot be easily inserted into a chest pocket or the like. or,
The contact portion 36 of the groove 36a of the large diameter portion 36 of the rotary shaft shown in FIG.
c contacts the rib 30a of the rear shaft to regulate the other rotation.

By the way, in the second embodiment shown in FIG. 8 described above, the bulging portion 61 of the rear shaft 60 is provided with the slanting locking concave portion 62, and the bent tip of the clip 64 in the state in which the writing tip portion is projected. The portion 65 is engaged with the locking recess 62 so that the clip cannot be inserted into a chest pocket or the like. 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 engaging tip portion or ball portion is formed in the engaging shape, However, it does not spread and makes a state where the clip cannot be inserted in the breast pocket at all.

[0024]

The structure and operation of the multiple writing instrument of the present invention are as described above. By simplifying the structure, it is advantageous in terms of assembling and cost, and the refill to be incorporated has a degree of freedom. It is possible to provide such a complex writing instrument with a shaft thickness that satisfies portability and usability. or,
Only when the writing tool is rotated and the writing tip is projected from the tip end opening, the tip of the clip is hidden by the recess provided in the bulging portion, so the clip can be easily or completely inserted into the chest pocket or the like. Since the writing tip is not inserted, it is not inserted into a chest pocket or the like while the writing tip is protruding, and therefore, an accident that stains clothes is prevented.

[Brief description of 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. Again 2
It has a kind of ballpoint pen cursive.

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; or,
The position of the clip accompanying rotation of the operating body is shown.

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

FIG. 5 is a longitudinal sectional view of the ballpoint pen writing body 1a.

6 is a cross-sectional view taken along the line DD in FIG.

7 is a sectional view taken along line EE in FIG.

FIG. 8 is a vertical cross-sectional view showing the latter half of the compound writing instrument of the second embodiment, which is partially shown in non-cross section.

[Explanation of symbols]

 1a Ball-point pen writing body 1b Ball-point pen writing body 2 Joint part 3 Bendable part 4 Thin part 4a Rib 5 Fin 6 Ink storage tube 7 Tip 8 Tip ball 9 Ink guide core 10 Ink storage body 11 Outer shell 12 Tails 13 Shaft part 14 Locking Groove 15 Press-fitting cylinder portion 16 Horizontal hole 17 Circumferential groove 18 Inner hole portion 19 Notch 20 Vent groove 30 Rear shaft 30a Rib 30b Step portion 31 Rib for guide 32 Male screw 33 Rotating shaft 34 Small diameter portion 35 Cam groove 36 Large diameter portion 36a Groove 36b Abutting part 36c Abutting part 37 Locking part 38 Locking groove 39 Bulging part 40a Recess 40b Recess 41 Locking rib 42 Operation body 42a Locking groove 43 Crown 43a Hole 44 Clip 44a Clip 44b Clip 45 Ball Part 46a Sliding piece 46b Sliding piece 47a Projection 47b Projection 48a Insertion hole 48b Insertion hole 49 Front shaft 50 Female screw 51a Locking part 51b Locking part 52a Guide groove 52b Guide protrusion 53a Groove 53b Groove 60 Rear shaft 61 Bulging part 62 Engagement recess 63 Operating body 64 Clip 65 Tip part

Claims (3)

[Claims] 1. A tip for holding a tip ball and an ink storage tube in the rear, an ink storage body capable of storing ink is provided in the ink storage tube, and a back surface of the tip ball and a front portion of the ink storage body. In an aqueous ball-point pen writing body in which an ink guide core is disposed between the ink-guiding body and the ink-guiding body, the ball-point pen writing body has a non-deformed shape in which the ink storage body accommodating portion of the ink storage tube has a relatively large cross-sectional area. The part connecting the tip and the ink occlusion body accommodating portion can be easily displaced laterally with respect to the axial direction, and a plurality of writing bodies including at least one of the ballpoint writing bodies are mounted, A compound writing instrument that allows the tip of each writing body to appear and disappear selectively from the tip of the shaft. 2. A compound writing instrument equipped with two types of writing bodies, wherein each writing tip can be selectively retracted from the tip opening of the leading shaft, and the leading and rear axes are provided. A rotary shaft that is rotatably arranged in the inner hole of the rear shaft within a range of 120 to 180 degrees with respect to the rear shaft and has a cam groove formed on the peripheral surface of the shaft, and a rotary shaft that projects to the rear end of the rear shaft. The operating body fixed to the rear end portion, and the operating body and the rotary shaft being rotatably held with respect to the rear shaft, and the projections engaging with the cam grooves of the rotary shaft are formed inside facing each other. A pair of sliding pieces are guided to the inner hole of the rear shaft so that the sliding pieces can move back and forth, and each writing piece is provided in front of each sliding piece so as to interlock with the sliding pieces.
It is configured such that the sliding tips are alternately moved back and forth due to the rotation of the rotary shaft accompanying the rotation of the operating body so that the writing tip portions of the respective writing bodies can be retracted and retracted from the leading shaft tip openings. The compound writing instrument according to claim 1, wherein 3. An operating body comprising: a clip extending from one side surface of the operating body toward the front of the rear shaft; and a bulging portion provided at a predetermined position on the peripheral surface of the rear shaft facing the front portion of the clip. Only when the writing tip is rotated and the writing tip is projected from the tip end opening, the tip of the clip is hidden by the recess provided in the bulging portion so that the clip cannot be easily inserted into a chest pocket or the like. The double-sided writing instrument according to claim 2, wherein