JPH10236075A - Compound writing utensil - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide compound writing utensils equipped with a plurality of ballpoint pen writing members whose ink containing pipes are large and non- deformable and whose writing tips are capable of smoothly sticking out and retracting, and having no possibility of staining clothes, etc. SOLUTION: A clip 39 having a locking step 40b formed at its forward end is provided on one side of an outer peripheral portion of an operating body rotatably disposed to a casing 30. Further, ballpoint pen writing members are inserted into the casing so as to be movable only in the direction of the casing with respect to the casing, and return springs 42a, 42b for urging the respective ballpoint pen writing members rearwardly are disposed between a step provided in the rear of a top end port of the casing and a forward end of each ink containing pipe. Slidable protrusions 6a, 6b integrally provided at a substantially rear end of an ink containing portion are engaged with a cam slant face 35 of a cylindrical cam and, by rotating the operating body with respect to the casing at a forward movement position of the cylindrical cam, writing tips of the respective ballpoint pen writing members can alternately stick out from and retract into a top end port of the casing.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improved writing instrument having a plurality of ballpoint pen writing bodies.

[0002]

2. Description of the Related Art In general, there is known a double-type writing instrument equipped with a plurality of writing objects such as a mechanical pencil and a ball-point pen so that the writing tip can be selectively protruded and retracted from an axis.

Conventionally known oil-based ballpoint pens have high resistance to the rotation of the ball when the ink flows out of the pen tip because the ink used for it has a high viscosity of several thousand mPa · S or more. Therefore, there is a drawback that writing is bad.
In addition, there is a problem in that the amount of ink flowing out from the tip during writing is small, there is a dent phenomenon, the writing line is uneven, the writing density is low, and a high writing pressure is required.

Recently, as an improvement of the oil-based ballpoint pen,
A ballpoint pen for water-based ink called a medium viscosity using an ink having an intermediate viscosity region between water and oil (several mPa · S to several thousand mPa · S) has 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. Further, 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.

The ballpoint pens using the medium-viscosity water-based ink and the low-viscosity oil-based ink are all low-viscosity, so that when the tip side faces downward, a gap between the tip ball and the tip holding portion occurs. There is a phenomenon in which the ink tends to flow backward due to a direct current problem in which the ink bleeds, upward writing, or an impact. If the ink causes backflow or direct current, there is a risk of soiling clothes and the like. In addition, when mounted on a writing instrument and inserted into a breast pocket or the like with the writing tip protruding, there is a problem in that clothes are soiled.

[0006]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a mechanism capable of maintaining a dry end of a writing tip, allowing a seal cap to be removed and leaving the seal cap, and preventing direct current or backflow of ink. Filled with low-viscosity inks such as medium-viscosity water-based and low-viscosity oil-based inks to form a ballpoint pen writing body. Can appear and disappear smoothly. In addition, when the writing tip is inserted into a breast pocket or the like with the writing tip protruding, the protruding locked state is released, and the writing tip is housed in the barrel so that there is no concern that the clothes etc. will be stained. Can be provided at a low cost with a simple structure.

[0007]

The present invention has the following arrangement to achieve the above object. A compound writing implement according to claim 1, wherein a plurality of ballpoint pen writing bodies are mounted in a barrel, and each writing tip can be selectively protruded and retracted from a tip end of the barrel. In the above, a clip having a locking step formed at the front end is provided on one side of an outer peripheral portion of the operating body rotatably fixed to the barrel, and a slit is formed on an outer peripheral portion of the operating body facing the clip. Is drilled,
Also, a cylindrical cam having a cam slope on the front surface and a locking projection on one side in front of the outer peripheral portion is fitted with the locking projection in the slit, and the locking projection is engaged with the locking step at the forward position. A ball-point pen writing body is inserted into the inner hole of the operation body so as to be movable so that it can be moved back and forth so as to lock, and a ballpoint pen writing body is inserted into the shaft cylinder so that it can move only in the axial direction. A return spring that urges each ballpoint pen writing body rearward is disposed between the stepped portion provided at the front and the front end of the ink storage tube, and is provided integrally at the substantially rear end of the ink storage portion. The projection is engaged with the cam slope of the cylindrical cam, and at the forward position of the cylindrical cam, the operating body is rotated with respect to the barrel so that the writing tip of each writing pen of the ballpoint pen comes from the tip end of the barrel. It is possible to appear alternately.

According to a second aspect of the present invention, there is provided a double-sided writing implement according to the first aspect, wherein the ball-point pen writing body has a tip for holding a tip ball and an ink storage section at the rear. The ink storage tube is filled with low-viscosity ink, and the rear end of the ink is filled with a grease-like follower that moves following the consumption of the ink accompanying writing,
In addition, the ink storage tube is substantially non-deformable, and is fitted into the shaft without swinging. A long front shaft portion that can be flexibly bent is provided between the front end of the ink storage tube and the writing tip. Be composed.

According to a third aspect of the present invention, there is provided the double-type writing instrument according to the second aspect, wherein the ball-point writing body is such that the tip ball always presses against the inner edge of the ball holding portion at the tip end of the tip. And a valve chamber in which a ball valve is loosely fitted facing the rear end of the chip, and a valve chamber is provided at the rear of the valve chamber. The ball valve is provided with a ball receiving seat for preventing backflow of ink due to close contact, and a guide hole communicating from the ball receiving seat to the ink storage portion.

[0010]

1 to 5 show a first embodiment of the present invention. In FIG. 1, two ballpoint pen writing bodies 1a and 1b are provided. The dual writing implement intended by the present invention is a ballpoint pen writing body filled with a low-viscosity ink such as a medium-viscosity aqueous solution having a so-called shear thinning viscosity, or a low-viscosity oil-based ink, or a normal large-capacity ink mounted. An oil-based ballpoint pen writing body or the like is used in combination as needed.

First, a ballpoint pen writing body mounted on the double-type 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 line widths. The ink applied to the ballpoint pen writing material is a medium-viscosity water-based, low-viscosity oil-based ink having a so-called shear thinning property.

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. Further, the spring 14 is inserted into the inner hole of the chip 11, and the rear end of the chip is appropriately caulked so that the rear end of the spring 14 cannot be pulled out. In addition, it is extremely important that the tip ball 12 is in close contact with the inner surface of the tip holding portion in order to dry the writing tip and to prevent direct current of ink. Therefore, the surface roughness of the tip holding the tip ball and the caulking In order to improve the close contact accuracy, grinding of the inner surface and secondary plastic working to increase the crimping accuracy are considered. or,
The surface treatment etc. are considered in the close contact surface with the tip ball.
Further, the tip of the spring 14 becomes a straight rod shaft portion 15, and the tip of the rod portion 15 comes into contact with the back surface of the tip ball 12 in a pressed state. In addition, the tip ball 12 is pressed by the pressing to
The first ball holding portion (formed by caulking or the like) is in close contact with the inner edge.

The cylindrical body 2 is formed by a long front shaft portion 3 for crimping the chip 11 at the tip and an ink containing tube 4, and the front shaft portion 3 is formed of a resin molded product having a slightly small diameter and which can be flexibly bent. I have. Further, a valve chamber 7 in which a ball valve 16 is loosely fitted is provided in a front end inner hole of the front shaft portion 3 so as to face the rear end of the chip 11, and the guide hole 9 is opened when the chip 11 is downward. In this way, the ink 17 is conducted to the chip side, and conversely, in the upward state, the ball valve 16 is configured to close the guide hole 9 to prevent the ink from flowing back.

Incidentally, the cross section of the ink storage tube 4 is substantially D
It has a shape (FIG. 5), and is formed into a substantially circular shape in a state where the two flat portions are in contact with each other. In the case of three ink containers, the cross section of the ink storage tube is formed in a substantially fan shape obtained by dividing a circle into 120 degrees. The ink container 4 is filled with the above-mentioned medium-viscosity water-based or low-viscosity oil-based ink 17, and the rear end of the ink 17 comes into contact with the ink surface together with the consumption of the ink and can follow and move. Follower 18 made of grease-like translucent non-drying material
Is filled. In the follower 18, a resin follower rod 19 having a specific gravity substantially equal to that of the follower is immersed.

An axially integral guide rib 5a is formed on the rear outer peripheral portion of the ink storage tube 4, and a sliding protrusion 6a is formed on the outer surface of the guide rib 5a. Further, the sliding protrusion 6a has a cam slope on its rear end side that is in sliding contact with a cam slope of a cylindrical cam described later. Further, in the embodiment, the sliding protrusion 6a and the guide rib 5a are provided integrally with the ink container 4, but it is also possible to fasten the ink container 4 as a separate member. Thus, the ballpoint pen writing body 1a is configured. In addition, ballpoint pen writing body 1b
Is similarly configured.

The double-type writing instrument shown in FIG. 1 includes two types of ballpoint pen writing bodies, a shaft cylinder 30 for storing the ballpoint pen writing bodies,
It consists of a tubular operating body 33 that is fixed to the rear of the shaft cylinder 30 so that it can only rotate. Further, the operating body 33 is detached from the barrel 30 as needed, and the writing body is replaced. It is also possible to make the shaft cylinder 30 separable into a front shaft portion and a rear shaft portion so that the ballpoint pen writing body can be replaced.

A clip 39 joined to a base 39a is provided on one side of the rear end of the outer periphery of the operation body 33, and a ball 40 is formed at the tip of the clip 39. The ball 40 has a window 40a. And a rear end thereof is provided with a locking step 4 described later.
0b. A slit 33a is formed in the outer peripheral portion of the operation body 33 facing the clip 39, and a cylindrical cam 34 having a cam slope 35 on the front surface and a locking projection 37 on one side in front of the outer peripheral portion is provided. , The locking projection 37 is formed in the slit 33a.
Is inserted into the inner hole of the operating body 33 so as to be able to move only in the forward and backward directions so that the locking projection 37 is locked to the locking step 40b at the advance position of the cylindrical cam 34 described later. If necessary, a cut may be made around the locking protrusion so that the locking protrusion 37 can be displaced so that the locking protrusion 37 is elastically deformed and fitted into the slit 33a.

Also, as will be described with reference to FIGS.
A cylindrical portion 31 is extended behind the cylindrical portion 31. A rib 31a is formed on the rear end surface of the cylindrical portion 31 so as to partially protrude circumferentially. Correspondingly, a rib 33 protruding from the inner periphery of the operating body 33 in a partly circumferential manner.
e is formed. A guide groove 30b is formed in the inner peripheral portion of the shaft cylinder 30 in the axial direction. Also, the holes 41a, 41a come into contact with the stepped portion 30a appropriately rearward of the distal end opening of the barrel 30.
The partition member 41 having b is fixed.

As described above, the ball-point pen writing body 1 is placed in the barrel 30 with the return springs 42a and 42b mounted on the outer periphery of the front shaft portion 3 of each ball-point pen writing body.
a and 1b are inserted and the respective guide grooves 30b are inserted.
The guide ribs 5a, 5b formed on the rear outer peripheral portions of the ballpoint pen writing bodies 1a, 1b are fitted into and the front shaft portion 3 protrudes from the holes 41a, 41b of the partition member 41. The ballpoint pen writing bodies 1a and 1b are constantly urged rearward by a return spring provided between the front ends 2a and 2b of the ink storage tube 4 and the partition member 41.

As described above, the operating body 33 is fitted in the cylindrical portion 31 of the shaft cylinder, and the projection 32 is engaged with the concave groove 33b by elastic deformation, so that the operating body 33 is rotatable with respect to the shaft cylinder 30 and is prevented from falling off.
The operating body 33 rotates with respect to the shaft cylinder 30 within a range of approximately 180 degrees where the rib 33e of the operating body 33 contacts the rib 31a of the cylindrical portion 31. (By the way, in the case of three kinds of cursive, approximately 270
At this time, the sliding protrusions 6a and 6b are slid on the cam slope 35, and the operating body 33 for the shaft cylinder 30 is rotated.
The pen-writing bodies 1a and 1b alternately move back and forth by the rotation of, so that the sliding projections 6a and 6b are notched at the front end of the cam slope 35 when the respective writing tips project from the tip end of the barrel.
6 is engaged.

By the way, when the contact portion 33f, which is one end of the rib 33e, comes into contact with the contact portion 31b, which is one end of the rib 31a, the tip of one of the ball-point pen writing bodies is moved to the barrel 30.
Abutment portion 3 which protrudes from the tip end of
When 3g comes into contact with the contact portion 31c, which is the other end of the rib 31a, the tip of the other ballpoint pen writing body projects from the tip end of the barrel. Further, when the ballpoint pen writing material comes and goes, the ink storage tube 4 is not deformed as described above.
Bends and can operate smoothly.

FIGS. 6 to 10 show a second embodiment of the present invention. Hereinafter, differences from the first embodiment will be described.

An axially integrated guide rib 72a is formed on the rear outer peripheral portion of the ink storage tube 71, and a sliding protrusion 73a appropriately swelling on the outer surface at the rear end of the guide rib 72a.
Are formed. The sliding projection 73a has a cam slope on the rear end side thereof, which is slidably in contact with a cam slope of an operation body described later. In the embodiment, the sliding protrusion 73a and the guide rib 7 are used.
Although 2a is provided integrally with the ink container 71, it is also possible to fasten the ink container to the ink container as a separate member. Thus, the ballpoint pen writing body 70a is configured. The ballpoint pen writing body 70b is similarly configured.

A step 50a is formed on the rear peripheral wall of the tip end of the barrel 50.
Is provided. Further, return springs 61a and 61b are inserted into the outer peripheral portions of the front shaft portions of the respective ball-point pen writing bodies, and the rear ends of the return springs 61a and 61b are abutted on the front ends of the ink storage tubes. Body 70a, 70
In addition, the guide ribs 72a and 72b formed on the rear outer peripheral portions of the ballpoint pen writing bodies 70a and 70b are fitted into the respective guide grooves 50b. Note that a linear locking portion 62 is provided in front of the return springs 61a and 61b.
a and 62b are formed, and the tips thereof are locked to the step portion 50a of the barrel 50, and the ballpoint pen writing bodies 70a and 7b are formed.
Ob is constantly urged rearward by return springs 61a and 61b provided between the front end of the ink storage tube 71 and the step portion 50a. Also, the inner circumference of the rear end of the return spring is set in such a manner as to bite the outer circumference of the front shaft so that the return spring does not rotate with respect to the front shaft. Also, the inner diameter of the return spring is provided slightly larger than the outer circumference of the front shaft portion so that the return spring is not deformed and the expansion and contraction is smooth.

A circumferential concave groove 53b is formed on the inner periphery of the front end of the operating body 53, and a semicircular groove 53c is formed at the front of the concave groove 53b as shown in FIG. Have been.
The operating body 53 is fitted in the tubular portion 51 of the shaft barrel 50 and has a concave groove 53.
The protrusion 52 is engaged with the shaft cylinder b by elastic deformation, so that the protrusion 52 is rotatable with respect to the barrel 50 and is prevented from coming off. In addition, the abutment rib 51a of the tube portion 51 is located in the groove 53c, and the operating body 53 is
Is rotated in a range of approximately 180 degrees with respect to. At that time, the sliding projections 73a and 73b are slid on the cam slope 55, and the ball-point pen writing body 70 is
a and 70b alternately move back and forth so that the sliding projections 73a, 73a, 7
3b engages with the notch 56 at the front end of the cam slope 55. In addition, when the ballpoint pen writing material appears and disappears, as described above, the ink storage tube 71 is not deformed, but the front shaft portion is bent so that it can operate smoothly.

[0026]

The first embodiment will be described. When the operating body 33 is rotated in one direction with respect to the barrel 30, the sliding projections 6a and 6b of the ballpoint pen writing body slide along the cam slope 35 with the rotation of the operating body 33, and either one of the ball-point pen The writing body moves forward and the other retreats, so that the writing tip on the forward side can protrude from the tip end of the barrel 30. In addition, even if the ink storage tube is not deformed, the writing tip portion is flexibly shifted, so that the operation is not hindered and the writing tip smoothly comes out of the tip opening.

Next, when the operating body 33 is rotated to the other side, the ball-point pen writing body 1a is retracted, and its writing tip is moved to the barrel 30.
And the ballpoint pen writing body 1b moves forward.
At this time, the writing tip is in a portable state accommodated in the barrel 30. When the barrel 30 is further rotated, the ballpoint pen writing body 1
a further retreats, the ballpoint pen writing body 1b further advances, and its writing tip projects from the tip end of the barrel 30.

When the clip 39 is inserted into a breast pocket or the like in the state shown in FIG. 1, the ball portion 40 is lifted and the locking between the locking step portion 40b and the locking projection 37 of the cylindrical cam is released. Then, the cylindrical cam 34 is retracted, and the writing tip protruding from the tip opening of the barrel is interlocked with the cylindrical cam 34 to be accommodated in the barrel. In order to project the writing tip again, the rear end of the cylindrical cam 34 is knocked, the cylindrical cam is advanced, and the locking projection 37 is locked to the locking step 40b.

The writing pen 1a of the ball-point pen has a tip 11
When the ball valve 16 faces upward, the ball valve 16 is positioned on the ball receiving seat 8 of the valve chamber 7 and seals the guide hole 9.
Even if the ink is written upward and the ink on the back surface of the tip ball 12 of the chip 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 backward direction when writing upwards, so that air is trapped in the chip and the ink does not follow immediately when writing downwards, causing scuffing.)

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 17 that has entered the valve chamber 7 from the inside of the ink storage section 4 through the guide hole 9 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

On the back surface of the tip ball 12, there is a channel (a seat for the tip ball having a plurality of ink inflow grooves penetrating toward the inner hole of the tip), and the rod shaft portion 15 passes through the 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. Note that the second embodiment is the same as the first embodiment, and a description thereof will be omitted.

[0032]

The composition and operation of the double-type writing instrument of the present invention are as described above. The dry end of the writing tip is maintained, the seal cap can be removed and the writing tip can be left, and direct current and reverse flow of ink can be prevented. Constructs a low-viscosity ink ballpoint pen writing body with a mechanism that enables it, equipped with multiple large and non-deformed ballpoint pen writing bodies, the writing tip can smoothly appear and disappear, and the writing tip protrudes When it is inserted into the breast pocket etc., the projected locking state is released and the writing tip is housed in the barrel, so that there is no risk of soiling clothes etc. due to leakage of ink by the writing tip, Since the multiple writing implements are composed of the required number of ballpoint pen writing bodies, the operating body, and the simple components of the barrel, they can be provided at low cost.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing the entirety of a double-type writing instrument according to a first embodiment of the present invention, which is partially not shown in section. 2
It has a kind of ballpoint pen cursive.

FIG. 2 is a cross-sectional view of the operation body.

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

FIG. 4 is a longitudinal sectional view of a writing pen of a ballpoint pen used in the first embodiment.

FIG. 5 is a sectional view taken along the line BB in FIG. 4;

FIG. 6 is a vertical cross-sectional view showing the entirety of a double-type writing instrument according to a second embodiment of the present invention, and is partially shown in a non-cross-sectional view. 2
It has a kind of ballpoint pen cursive.

FIG. 7 is an external view of a main part showing a rear part of a shaft cylinder part.

FIG. 8 is a sectional view of the operation body.

9 is a sectional view taken along the line CC in FIG. 6;

FIG. 10 is a longitudinal sectional view of a ballpoint pen writing body used in the second embodiment.

[Explanation of symbols]

 1a Ballpoint pen writing body 1b Ballpoint pen writing body 2 Cylindrical body 2a Front end 2b Front end 3 Front shaft 4 Ink storage tube 5a Guide rib 5b Guide rib 6a Sliding projection 6b Sliding projection 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 Bar shaft part 16 Ball valve 17 Ink 18 Follower 19 Follower rod 30 Shaft tube 30a Step portion 30b Guide groove 31 Tube portion 31a Rib 31b Contact portion 31c Contact portion 32 Projection 33 operation body 33a slit 33b concave groove 33c step 33d step 33e rib 33f contact part 33g contact part 34 cylindrical cam 35 cam slope 36 notch 37 locking projection 38 rear end 39 clip 39a base 40 ball part 40a window Part 40b Locking step part 41 Partition member 41a Hole 41b Hole 42a Rita Spring 42b return spring 50 shaft cylinder 50a step 50b guide groove 51 cylinder 51a contact rib 52 protrusion 53 operating body 53a slit 53b concave groove 53c groove 53d contact part 53e contact part 54 cylindrical cam 55 cam slope 56 notch 57 Locking projection 58 Rear end 59 Clip 59a Base 60 Ball 60a Window 60b Locking step 61a Return spring 61b Return spring 62a Locking section 62b Locking section 70a Ballpoint pen writing 70b Ballpoint writing 71 71 Ink storage tube 72a Guide rib 72b Guide rib 73a Sliding projection 73b Sliding projection

Claims (3)

[Claims] 1. A double-type writing instrument in which a plurality of ballpoint pen writing bodies are mounted in a barrel, and each of the writing tips can be alternately protruded and retracted from a tip end of the barrel. A clip having a locking step formed at the front end is provided on one side of an outer peripheral portion of the operation body rotatably fixed, and a slit is formed in an outer peripheral portion of the operation body facing the clip, A cylindrical cam having a cam slope on the front side and a locking projection on one side in front of the outer peripheral portion is fitted with the locking projection in the slit, and the locking projection is locked to the locking step at the advanced position. The ball-point pen writing body is inserted into the inner hole of the operating body so as to be movable back and forth so that it can move only in the axial direction with respect to the shaft cylinder, and is provided behind the tip opening of the shaft cylinder. A return spring that urges each ball-point pen cursive back between the stepped portion and the front end of the ink storage tube A sliding projection integrally provided at a substantially rear end of the ink storage portion is engaged with a cam slope of the cylindrical cam, and at a forward position of the cylindrical cam, a A dual writing implement characterized in that the writing tip of each ball-point writing tool can be alternately protruded and retracted from the tip end of the barrel by rotating the operating tool. 2. A writing pen for a ball-point pen has a tip for holding a tip ball and an ink storage section at the rear, and a low-viscosity ink is filled in an ink storage tube, and ink is consumed at the rear end of the ink during writing. Is filled with a grease-like follower that moves following the
2. The double writing implement according to claim 1, wherein a long front shaft that can be flexibly bent is provided between the front end of the ink storage tube and the writing end, and is inserted into the shaft without swinging. . 3. The ballpoint pen writing body is such that the tip ball always presses and contacts the inner edge of the ball holding portion at the tip end,
It has a spring provided to release the close contact state during writing, and further has a valve chamber in which a ball valve is loosely fitted facing the rear end of the chip, and the ball valve is in close contact with the rear of the valve chamber. 3. The dual writing implement according to claim 2, further comprising a ball receiving seat for preventing backflow of the ink and a guide hole communicating from the ball receiving seat to the ink storing portion.