JPH10264588A - Dual type writing implement - Google Patents

Abstract

PROBLEM TO BE SOLVED: To selectively project or retract a writing tip of a writing element from a barrel tip by connecting the element forward of a pair of sliders disposed in an inscribing state with an inner periphery of a barrel oppositely to a lengthwise direction of a long cylindrical state. SOLUTION: When a rear barrel 39 is rotated in one direction to an intermediate barrel 30, projections of sliders 48a, 48b are slid along a cam groove 35 upon rotation of a rotary shaft 33, either one sliding dowel is moved forward, while the other is moved backward. Thus, a writing tip of a writing element 2a of the forward side is protruded from a tip port of the front barrel 58. And, even if an ink containing part of a ballpoint pen element 1b is non-deformed, a writing tip site can be transited in a centripetal direction. And, since it is changed to a long cylindrical state until the front barrel is arrived at the tip port, the operation is not disturbed, and the writing tip can be smoothly projected from or retracted in the port of the barrel 58.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention has an ink storage section for directly storing ink without storing it in an ink storage body or the like. When the air in the ink storage section expands due to a temperature rise or the like, the ink is pushed out of the ink storage section. Two kinds of ballpoint pen writing materials with ink reservoirs that temporarily store ink to prevent it from dropping from the tip ball or vent groove are mounted, and each writing tip alternates from the tip opening by rotating operation The present invention relates to a double-type writing instrument which is capable of appearing in a house.

[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.

A ball-point pen writing material filled with a low-viscosity ink has a thick ink storage tube, and when mounted on a double-type writing instrument having a normal thickness, the tip of the writing material protrudes without any degree of freedom between the writing materials. 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 to enable the operation, and the portability and the usability are deteriorated. or,
If the tip of the cursive script 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 soiled.

[0004] Low-viscosity inks such as water-based ballpoint pens have low viscosity of several mPa · S or less, and therefore have the advantage that they can be written with light writing pressure and have good writing quality. 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 body (ink occluding body) called batting has been adopted.
Further, there is known an ink storage device provided with an ink storage body for temporarily storing ink.

[0005]

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems of the prior art, that is, a ballpoint pen writing body provided with an ink reservoir for temporarily holding ink is provided in a two-shaft cylinder. The present invention can provide a double-type writing instrument which is convenient for selectively writing in and out of the writing tip of each writing body from the tip of the barrel, and which does not have a risk of soiling clothes and the like.

[0006]

According to a first aspect of the present invention, there is provided a double-type writing instrument comprising: a tip for holding a tip ball; a joint and an ink retaining body integrally provided in series behind the tip; The ink storage tube has a relatively large cross-sectional area and is substantially non-deformed with a closed rear end. The ink storage tube is filled with low-viscosity ink, and the ink reservoir is fitted into the front inner hole of the ink storage tube. A ballpoint pen cursive which is worn,
In a compound writing instrument equipped with two types of the ballpoint pen writing bodies, a shaft cylinder constituted by a front shaft and a central shaft is formed in a long cylindrical shape, and is opposed to a longitudinal direction of the long cylindrical shape on an inner periphery of the shaft cylinder. A pair of sliding bodies disposed in a substantially inscribed state, and a cam mechanism for alternately moving the sliding bodies back and forth, a writing body is connected in front of each sliding body, and interlocked with the sliding bodies. The tip of each cursive can be protruded and retracted from the tip of the barrel.

According to a second 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 central shaft, and the central shaft is provided in an inner hole of the cylindrical portion. On the other hand, a rotating shaft that is rotatably arranged in a range of approximately 180 degrees and has a cam groove formed on the shaft peripheral surface, and a rotating shaft 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, and a pair of rear shafts formed so that the rear shaft is rotatably held with respect to the center shaft and the protrusions that engage with the cam grooves of the rotary shaft are respectively opposed to each other. The sliding members are guided in the inner hole of the center shaft so as to be able to move only forward and backward, and each of the sliding members can be alternately moved back and forth 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 central shaft, and the central shaft is provided in an inner hole of the cylindrical portion. On the other hand, a rotating shaft that is rotatably disposed within a range of approximately 180 degrees and has two protrusions formed in front of the shaft circumferential surface, and is fitted on the outer periphery of the cylindrical portion and protrudes from the rear end of the cylindrical portion. The rear shaft provided integrally with the rear end of the rotating shaft, and the inclined cam groove that engages with the projection of the rotating shaft while the rear shaft is rotatably held with respect to the center shaft are opposed to each other. A pair of sliding bodies formed inside are guided by the inner hole of the center shaft so that only the forward and backward movement is possible, and the sliding bodies can be alternately moved back and forth by rotation of the rotating shaft accompanying rotation of the rear shaft. .

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 long cylindrical portion of the middle shaft and the front portion of the rear shaft are substantially the same in shape. ,
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. With the front end in the longitudinal direction of the clip engaged with the edge of the center shaft, the clip cannot be attached to a pocket or the like. The distal end of the clip is located at the short diameter portion at the rear end of the clip so that the clip can be attached to a pocket or the like.

[0010]

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 materials having different ink colors and writing line widths filled with low-viscosity ink.

The double-type writing instrument shown in FIG. 1 comprises 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 rotary 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) Note 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. Therefore, when the diameter of the barrel is small, the rotation angle is selected closer to 180 degrees, and when the diameter is larger, the rotation angle is selected closer to 120 degrees for design convenience.

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. this is,
This is provided so that ventilation can be made to the inner hole portion of the ink storage tube when a ballpoint pen writing material having a rear end opening shape other than the embodiment is fixed. Protrusions 51a, 5 are provided on the inner surface behind the rear portions 50a, 50b so that the respective sliding bodies can move back and forth by pressing the cam grooves 35 with the rotation of the rotating shaft 33.
1b is formed. Also, the tip portions 49a, 49 of the sliding body are provided.
On the outer circumference of b, a rib 53 is provided which stops rotation and engages a guide groove 56 formed on the inner circumference of the long cylindrical portion 30d of the center shaft.
a, 53b are provided. (It is also possible to replace the groove and the rib between each other.) Also, on the outer periphery of the rear portion 50a, 50b of the sliding body, there is provided a guide for the guide formed on the inner periphery of the cylindrical portion 30c of the center shaft. The grooves 57 are provided with ribs 52a and 52b which are engaged with the rotation stop. (The groove and the rib between each other can be replaced with each other.) Therefore, the rib provided on the outer periphery of the sliding bodies 48a and 48b meshes with the guide groove provided on the inner periphery of the center shaft 30, respectively. Thereby, the sliding bodies 48a and 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 an aqueous or oily low-viscosity ink.

As shown in the drawing, the tip 8 is caulked so that the tip ball 9 is rotatably held with the tip ball 9 substantially in contact with a seat having a channel into which ink can flow.

The joint 2 has a flange 5 behind the front shaft 3.
And an ink reservoir 4 having a plurality of retaining grooves 4a further on the rear side as an integral resin molded product. Further, the shaft 8a of the tip 8 is press-fitted to the inner hole 3a at the tip of the front shaft 3, and the ink reservoir 4 is firmly fixed to the front end hole of the ink storage tube 10.

Further, a ventilation groove 4b is provided at a required portion of the flange portion 5 which is in contact with the front end of the ink storage tube 10 to exchange the outside air with the air in the ink storage body 4 and the ink storage tube 10. The air passage for air replacement has an effect on the loss of volatilization of the ink, and although it is simply shown in the figure, a narrow bypass air passage is desirable.

The ink storage tube 10 is filled with low-viscosity ink 11 at the rear of the ink reservoir 4. or,
A closing portion 10a is formed at a substantially rear end of the ink storage tube 10. In addition, a transparent polypropylene resin molded product or the like is used as the ink storage tube 10 as an example. In addition, the ink storage tube 10 is selected from a material having an excellent clear drain property. The ink container 10 has a relatively large diameter and is substantially non-deformed.

[0024]

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 one of the ballpoint pen writing bodies 1a projects, the tip of the clip 44 is engaged with the edge 30e of the center shaft as shown in FIG. 1, 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.

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.

[0027]

The construction and operation of the double-type writing instrument of the present invention are as described above. A ball-point pen using low-viscosity ink is mounted in two types of barrels, and each of the ball-point writing bodies is placed from the tip end 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 Ballpoint pen writing body 1b Ballpoint pen writing body 2 Joint 3 Front shaft 3a Inner hole 4 Ink reservoir 4a Reservation groove 4b Vent groove 5 Flange 6 Ink guide core 7 Ink guide core 8 Tip 8a Shaft 9 Tip ball 10 Ink Housing tube 10a Closed portion 11 Ink 30 Middle shaft 30a Rib 30b Step portion 30c Cylindrical portion 30d Long cylindrical portion 30e Edge portion 30f Flat portion 32 Engagement portion 33 Rotation shaft 34 Small diameter portion 35 Cam groove 36 Large diameter portion 36a Groove 36b Contact portion 36c Contact part 37 Locking part 38 Detent groove 39 Rear shaft 40 Detent rib 41 Hole 42 Locking groove 43 Base 44 Clip 45 Ball part 46 Tip part 47 Flat part 48a Sliding body 48b Sliding body 49a Tip part 49b tip Part 50a Rear part 50b Rear part 51a Projection part 51b Projection part 52a Rib 52b Rib 53a Rib 53 Rib 54a Boss 54b Boss 55a Ventilation groove 55b Ventilation groove 56 Guide groove 57 Guide groove 58 Lead shaft 59 Locking part 70 Rotating shaft 71 Projection 72a Sliding body 72b Sliding body 73a Cam groove 73b Cam groove 74 Clip 75 Tip Part 76 Rear shaft 77 Projection

Claims (4)

[Claims] 1. A tip holding a tip ball, a joint and an ink reservoir are integrally provided in series behind the tip, and the ink receiving pipe has a substantially rear end closed shape having a relatively large cross-sectional area. A ballpoint pen writing body in which the ink storage tube is filled with low-viscosity ink and an ink reservoir is fitted into the front inner hole of the ink storage tube, and two types of the ballpoint pen writing body are mounted. In the dual-purpose writing instrument, the shaft barrel constituted by the front shaft and the center shaft is formed into a long cylindrical shape,
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. The dual writing implement according to claim 2, wherein the writing instrument is configured to be formed as follows.